-----BEGIN PRIVACY-ENHANCED MESSAGE-----
Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
Originator-Key-Asymmetric:
 MFgwCgYEVQgBAQICAf8DSgAwRwJAW2sNKK9AVtBzYZmr6aGjlWyK3XmZv3dTINen
 TWSM7vrzLADbmYQaionwg5sDW3P6oaM5D3tdezXMm7z1T+B+twIDAQAB
MIC-Info: RSA-MD5,RSA,
 Q3pQcgiOgU7OuLAVhh6/8JRjE4f/+5qUr52U/8dHKh0Kva3trz0qHVjcS8g61hY+
 JucSwJVvU8AY9PLEkQzBhA==

<SEC-DOCUMENT>0000950134-06-021077.txt : 20061109
<SEC-HEADER>0000950134-06-021077.hdr.sgml : 20061109
<ACCEPTANCE-DATETIME>20061109152101
ACCESSION NUMBER:		0000950134-06-021077
CONFORMED SUBMISSION TYPE:	10-Q
PUBLIC DOCUMENT COUNT:		5
CONFORMED PERIOD OF REPORT:	20060930
FILED AS OF DATE:		20061109
DATE AS OF CHANGE:		20061109

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NATURAL GAS SERVICES GROUP INC
		CENTRAL INDEX KEY:			0001084991
		STANDARD INDUSTRIAL CLASSIFICATION:	OIL, GAS FIELD SERVICES, NBC [1389]
		IRS NUMBER:				752811855

	FILING VALUES:
		FORM TYPE:		10-Q
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31398
		FILM NUMBER:		061201764

	BUSINESS ADDRESS:	
		STREET 1:		2911 SCR 1260
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79706
		BUSINESS PHONE:		9155633974

	MAIL ADDRESS:	
		STREET 1:		2911 SCR 1260
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79706
</SEC-HEADER>
<DOCUMENT>
<TYPE>10-Q
<SEQUENCE>1
<FILENAME>d41123e10vq.htm
<DESCRIPTION>FORM 10-Q
<TEXT>
<HTML>
<HEAD>
<TITLE>e10vq</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM 10-Q</B>
</DIV>

<DIV align="center">
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%" style="font-size: 12pt">
<TR style="font-size: 6pt">
    <TD width="7%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR valign="top">
    <TD align="center"><FONT face="Wingdings">&#254;</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><B>QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF
THE SECURITIES EXCHANGE ACT OF 1934</B></TD>
</TR>
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 12%"><B><B>For the quarterly period ended </B><U><B>September&nbsp;30, 2006</B></U>
</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>OR</B></DIV>

<DIV align="center">
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%" style="font-size: 12pt">
<TR style="font-size: 6pt">
    <TD width="7%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR valign="top">
    <TD align="center"><FONT face="Wingdings">&#111;</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><B>TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934</B></TD>
</TR>
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 12%"><B><B>For the transition period from <U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U> to </B><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U>
</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Commission File Number 1-31398</B></DIV>

<DIV align="center" style="font-size: 24pt; margin-top: 12pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center" style="font-size: 10pt">(Exact name of registrant as specified in its charter)</DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top"><B>Colorado</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>75-2811855</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">(State or other jurisdiction of
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">(I.R.S. Employer</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">incorporation or organization)
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">Identification No.)</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>2911 SCR 1260<BR>
Midland, Texas 79706</B><BR>
(Address of principal executive offices)</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>(432)&nbsp;563-3974</B><BR>
(Issuer&#146;s telephone number, including area code)</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Indicate by check mark whether the registrant (1)&nbsp;has filed all reports required to be filed
by Section&nbsp;13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12&nbsp;months (or
for such shorter period that the registrant was required to file such reports), and (2)&nbsp;has been
subject to such filing requirements for the past 90&nbsp;days.
</DIV>

<DIV align="center" style="font-size: 10pt">Yes <FONT face="Wingdings">&#254;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No <FONT face="Wingdings">&#111;</FONT></DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Indicate by check mark whether the registrant is a large accelerated filer, and accelerated filer,
or a non-accelerated filer. See definition of &#147;accelerated filer and large accelerated filer&#148; in
Rule&nbsp;12b-2 of the Exchange Act.
</DIV>

<DIV align="center" style="font-size: 10pt">Large Accelerated Filer <FONT face="Wingdings">&#111;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Accelerated Filer <FONT face="Wingdings">&#111;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Non-Accelerated Filer <FONT face="Wingdings">&#254;</FONT></DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Indicate by check mark whether the registrant is a shell company (as defined in Rule&nbsp;12b-2 of the
Exchange Act).
</DIV>

<DIV align="center" style="font-size: 10pt">Yes <FONT face="Wingdings">&#111;</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No <FONT face="Wingdings">&#254;</FONT></DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>APPLICABLE ONLY TO CORPORATE ISSUERS</B></DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Indicate the number of shares outstanding of each of the issuer&#146;s classes of common equity, as of
the latest practicable date.
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="47%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="47%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD align="center" valign="top">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>Outstanding at</B></TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top"><B>Class</B>
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top"><B>September&nbsp;30, 2006</B></TD>
</TR>
<TR style="font-size: 1px">
    <TD align="center" valign="top" style="border-top: 1px solid #000000">&nbsp;
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center" valign="top">Common Stock, $.01 par value
</TD>
    <TD>&nbsp;</TD>
    <TD align="center" valign="top">11,968,444</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>





<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">







<DIV align="left">
<!-- TOC -->
</DIV>
<DIV align="left">
<A name="tocpage"></A>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="88%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Part I &#151; FINANCIAL INFORMATION</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><U><B>Item&nbsp;1.</B></U> <B>Financial Statements</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#101">Unaudited Condensed Consolidated Balance Sheets </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 1</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#102">Unaudited Condensed Consolidated Income Statements </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 2</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#103">Unaudited Condensed Consolidated Statements of Cash Flows </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 3</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#104">Notes to Unaudited Condensed Consolidated Financial Statements </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 4</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#105"><B>Item&nbsp;2. </B>Management&#146;s Discussion and Analysis of Financial Condition and
Results of Operations </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 17</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#106"><B>Item&nbsp;3. </B>Quantitative and Qualitative Disclosures about Market Risk </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 26</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#107"><B>Item&nbsp;4. </B>Controls and Procedures.....................................................</A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 26</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#108"><B>Part II &#150; OTHER INFORMATION</B></A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#109"><B>Item&nbsp;1. </B>Legal Proceedings... </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 27</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#110"><B>Item&nbsp;1A. </B>Risk Factors </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 27</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#111"><B>Item&nbsp;6. </B>Exhibits </A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 28</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#112"><B>Signatures</B></A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" align="center">Page 33</TD>
</TR>
<!-- End Table Body -->
<TR><TD colspan="9"><FONT size="2">&nbsp;<A HREF="d41123exv31w1.htm">Certification of CEO Pursuant to Section 302</A></FONT></TD></TR>
<TR><TD colspan="9"><FONT size="2">&nbsp;<A HREF="d41123exv31w2.htm">Certification of CFO Pursuant to Section 302</A></FONT></TD></TR>
<TR><TD colspan="9"><FONT size="2">&nbsp;<A HREF="d41123exv32w1.htm">Certification Required by Section 906</A></FONT></TD></TR>
<TR><TD colspan="9"><FONT size="2">&nbsp;<A HREF="d41123exv32w2.htm">Certification Required by Section 906</A></FONT></TD></TR>
</TABLE>
</DIV>

<DIV align="left">
<!-- /TOC -->
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="101"></A>
</DIV>
<DIV align="center" style="font-size: 10pt"><B>CONDENSED CONSOLIDATED BALANCE SHEETS</B><br>
<I>(in thousands)</I></DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">December 31, 2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">September 30, 2006</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><I>(unaudited)</I></TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD align="center"><DIV style="margin-left:15px; text-indent:-15px"><B>ASSETS</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Current Assets:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Cash and cash equivalents</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,271</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,195</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Short-term investments</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">29,205</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Trade accounts receivable, net of doubtful accounts</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,192</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,015</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Inventory, net of allowance</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">14,723</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">17,943</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Prepaid expenses and other</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">456</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">350</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Total current assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">24,642</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">57,708</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Rental equipment, net of accumulated depreciation of
$7,598 and $10,139, respectively</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">41,201</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">55,695</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Property and equipment, net of accumulated
depreciation of $2,458 and $3,424, respectively</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,424</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,699</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Goodwill, net of accumulated amortization $325</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10,039</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10,039</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Intangibles, net of accumulated amortization of $492
and $737, respectively</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,978</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,732</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Other assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">85</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">166</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">86,369</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">134,039</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD align="center"><DIV style="margin-left:15px; text-indent:-15px"><B>LIABILITIES AND STOCKHOLDERS&#146; EQUITY</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Current Liabilities:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Current portion of long-term debt</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,680</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">4,844</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Line of credit</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">300</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Accounts payable and accrued liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">5,124</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,991</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Deferred income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">103</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">136</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Total current liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,207</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,971</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Long-term debt, less current portion</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">20,225</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">13,434</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Subordinated notes, less current portion</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,000</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,000</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Deferred income tax payable</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,247</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">9,069</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Total liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">40,679</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">35,474</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:30px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Stockholders Equity:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Common stock; 9,022 and 11,968 shares issued and
outstanding, respectively</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">90</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">120</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Additional paid-in capital</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">34,667</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">82,244</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Retained earnings</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10,933</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16,201</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:90px; text-indent:-15px">Total stockholders&#146; equity</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">45,690</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">98,565</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Total liabilities and stockholders&#146; equity</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">86,369</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">134,039</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">See accompanying notes to these condensed consolidated financial statements.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->1<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="102"></A>
</DIV>
<DIV align="center" style="font-size: 10pt"><B>CONDENSED CONSOLIDATED INCOME STATEMENTS</B><br>
<I>(in thousands, except earnings per share)<br>
(unaudited)</I></DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">Three months ended September 30,</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">Nine Months ended September 30,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Revenue:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Sales, net</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">7,479</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">10,880</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">22,066</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">28,509</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Service and maintenance income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">610</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">209</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,770</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">749</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Rental income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,371</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,041</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,696</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16,908</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total revenue</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">12,460</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">17,130</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">35,532</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">46,166</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Operating costs and expenses:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Cost of sales, exclusive of depreciation stated
separately below</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">5,778</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,351</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16,977</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">22,472</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Cost of service and maintenance, exclusive of
depreciation stated separately below</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">341</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">170</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,145</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">567</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Cost of rentals, exclusive of depreciation
stated
separately below</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,782</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,240</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,539</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,513</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Selling expense</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">269</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">331</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">750</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">958</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">General and administrative expense</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,007</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">851</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,850</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,866</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Depreciation and amortization</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,076</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,497</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,026</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,135</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total operating costs and expenses</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10,253</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">13,440</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">29,287</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">37,511</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Operating income</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,207</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,690</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,245</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,655</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Other income (expense):</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Interest expense</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(508</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(385</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,439</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,308</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Other income (expense)</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">33</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">447</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">51</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,015</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total other income (expense)</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(475</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">62</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,388</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(293</TD>
    <TD nowrap>)</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Income before provision for income taxes</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,732</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,752</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,857</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,362</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Provision for income taxes</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">641</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,388</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,797</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,094</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Net income</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,091</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,364</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,060</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,268</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px"><B>Earnings per share:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Basic</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.14</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.20</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.43</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.47</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Diluted</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.12</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.20</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.37</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.47</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px"><B>Weighted average shares outstanding:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Basic</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,606</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,960</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,078</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,199</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Diluted</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,771</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">12,046</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,213</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,264</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">See accompanying notes to these condensed consolidated financial statements.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->2<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="103"></A>
</DIV>
<DIV align="center" style="font-size: 10pt"><B>CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS</B><br>
<I>(in thousands of dollars)<br>
(unaudited)</I></DIV>


<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">Nine Months Ended September 30,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>CASH FLOWS FROM OPERATING ACTIVITIES:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Net income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,060</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,268</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px"><B>Adjustments to reconcile net income to net cash
provided by operating activities:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Depreciation and amortization</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,026</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,135</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Deferred taxes</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,700</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,094</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Income taxes paid</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(879</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Employee stock options expensed</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">218</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Amortization of debt issuance costs</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">49</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Gain on sale of property and equipment</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(17</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Gross profit from sale of rental equipment</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(47</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,233</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px"><B>Changes in current assets and liabilities:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Trade and other receivables</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(2,057</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,823</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Inventory and work in progress</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(5,345</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(3,220</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Prepaid expenses and other</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(32</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">106</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Accounts payable and accrued liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,180</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,475</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Deferred income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(723</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">33</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:75px; text-indent:-15px">Other assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">323</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(94</TD>
    <TD nowrap>)</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>NET CASH PROVIDED BY OPERATING ACTIVITIES</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,134</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,063</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>CASH FLOWS FROM INVESTING ACTIVITIES:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Purchase of property and equipment</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(13,107</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(21,583</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Purchase of short-term investments</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(37,905</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Redemption of short-term investments</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,700</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Assets acquired, net of cash</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(7,584</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Proceeds from sale of property and equipment</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">32</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Proceeds from sale of rental equipment</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">239</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,155</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>NET CASH USED IN INVESTING ACTIVITIES</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(20,452</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(46,601</TD>
    <TD nowrap>)</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>CASH FLOWS FROM FINANCING ACTIVITIES:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Proceeds from long-term debt</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">20,517</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">68</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Proceeds from line of credit</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">300</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,375</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Repayments of long-term debt</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(12,268</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(8,695</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Repayments of line of credit</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,675</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Proceeds from exercise of stock options and warrants</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">226</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Proceeds from sale of stock, net of transaction costs</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">12,813</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">47,163</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>NET CASH PROVIDED BY FINANCING ACTIVITIES</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">21,362</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">38,462</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>NET CHANGE IN CASH</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">5,044</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,076</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">685</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,271</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>CASH AND CASH EQUIVALENTS AT END OF PERIOD</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,729</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,195</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Interest paid</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,396</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,146</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Income taxes paid</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">879</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>SUPPLEMENTAL DISCLOSURE OF NON-CASH INVESTING AND
FINANCING ACTIVITIES:</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Assets acquired for issuance of subordinated debt</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,000</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Assets acquired for issuance of common stock</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,120</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">See accompanying notes to these condensed consolidated financial statements.
</DIV>



<P align="center" style="font-size: 10pt"><!-- Folio -->3<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="104"></A>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(1)&nbsp;Basis of Presentation and Summary of Significant Accounting Policies</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The accompanying unaudited condensed consolidated financial statements present the
condensed consolidated results of our company taken from our books and records. In our opinion,
such information includes all adjustments, consisting of only normal recurring adjustments, which
are necessary to make our financial position at September&nbsp;30, 2006 and September&nbsp;30, 2005 and the
results of our operations for the three and nine month periods ended September&nbsp;30, 2006 and
September&nbsp;30, 2005 not misleading. As permitted by the rules and regulations of the Securities and
Exchange Commission (SEC)&nbsp;the accompanying condensed consolidated financial statements do not
include all disclosures normally required by accounting principles generally accepted in the United
States of America. These condensed consolidated financial statements should be read in conjunction
with the financial statements included in our Annual Report on Form 10-K for the year ended
December&nbsp;31, 2005 on file with the SEC. In our opinion, the condensed consolidated financial
statements are a fair presentation of the financial position, results of operations and cash flows
for the periods presented.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The results of operations for the nine month period ended September&nbsp;30, 2006 are not
necessarily indicative of the results of operations to be expected for the full fiscal year ending
December&nbsp;31, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Unless otherwise noted, amounts reported in tables are in thousands, except per share data and
stock option data.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><I>Short-Term investments</I>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Short-term investments consist primarily of government and corporate bonds with original
maturities of ninety days to one year.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><I>Revenue recognition</I>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Revenue from the sales of custom and fabricated compressors, and flare systems is recognized
upon shipment of the equipment to customers. Exchange and rebuild compressor revenue is recognized
when both the replacement compressor has been delivered and the rebuild assessment has been
completed. Revenue from compressor services is recognized upon providing services to the customer.
Maintenance agreement revenue is recognized as services are rendered. Rental revenue is recognized
over the terms of the respective rental agreements based upon the classification of the rental
agreement. Deferred income represents payments received before a product is shipped. Revenue from
the sale of rental units is included in sales revenue when equipment is shipped or title is
transferred to the customer.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><I>Intangibles</I>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;At September&nbsp;30, 2006 the Company has intangible assets (excluding patents) with a gross
carrying value of $4.2&nbsp;million, which relate to developed technology, acquired customer contracts,
distribution agreements and non-compete agreements. The carrying amount net of accumulated
amortization at September&nbsp;30, 2006 was $3.7&nbsp;million. Intangible assets (excluding patents) are
amortized on a straight-line basis with useful lives ranging from 5 to 20&nbsp;years with a weighted
average life of approximately 16&nbsp;years. In addition, the Company had an intangible asset with a
gross carrying value of $654 thousand at September&nbsp;30, 2006 related to the trade name of SCS. This
asset is not being amortized as it has been deemed to have an indefinite life.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->4<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following table represents estimated future amortization expense for the years ending
December&nbsp;31, (in thousands).
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="88%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">2006</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">75</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">2007</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">299</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">2008</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">299</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">2009</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">299</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">2010</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">260</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Thereafter</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,808</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,040</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Company&#146;s policy is to periodically review the net realizable value of its
intangibles, other than goodwill and patents, through an assessment of the estimated future cash
flows related to such assets. In the event that assets are found to be carried at amounts in
excess of estimated undiscounted future cash flows, then the assets will be adjusted for impairment
to a level commensurate with a discounted cash flow analysis of the underlying assets. Based upon
its most recent analysis, the Company believes no impairment of intangible assets exists at
September&nbsp;30, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(2)&nbsp;Recently Issued Accounting Pronouncements</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On December&nbsp;16, 2004, the FASB published FASB Statement No.&nbsp;123 (revised 2004),
<I>Share-Based Payment </I>(&#147;Statement 123R&#148;), requiring that the compensation cost relating to
share-based payment transactions be recognized in financial statements. That cost will be measured
based on the fair value of the equity or liability instruments issued. We adopted Statement 123 (R)
as of January&nbsp;1, 2006. See Note 4 for discussion of the impact of the adoption of Statement No.&nbsp;123
(R).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(3)&nbsp;Acquisition</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On October&nbsp;18, 2004, Natural Gas Services Group, Inc. entered into a Stock Purchase
Agreement with Screw Compression Systems, Inc., or &#147;SCS&#148;, and the stockholders of SCS. Under this
agreement, Natural Gas Services Group, Inc. agreed to purchase all of the outstanding shares of
capital stock of SCS for the purpose of expanding our product line, production capacity and
customer base.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;SCS was a privately owned manufacturer of natural gas compressors, with its principal offices
located in Tulsa, Oklahoma.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The stockholders of SCS received, in proportionate amounts (based on their stock ownership of
SCS), total consideration consisting of $16.1&nbsp;million:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>$8&nbsp;million in cash;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Promissory notes issued by Natural Gas Services Group, Inc. in the
aggregate principal amount of $3&nbsp;million bearing interest at the rate of 4.00% per
annum, maturing three years from the date of closing and secured by a letter of credit
in the face amount of $2&nbsp;million; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>609,756 shares of Natural Gas Services Group, Inc. common stock valued at
$5.1&nbsp;million based upon the closing price of the Company&#146;s stock at the time of the
transaction. All of the shares are &#147;restricted&#148; securities within the meaning of Rule
144 under the Securities Act of 1933, as amended, and bear a legend to that effect.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt"><!-- Folio -->5<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This transaction was completed January&nbsp;3, 2005 and Natural Gas Services Group, Inc. began
reporting combined financial information with SCS in January&nbsp;2005. The total purchase price was
$16.1&nbsp;million and the Company recorded goodwill of approximately $5.0&nbsp;million and intangible assets
of approximately $4.2&nbsp;million, reflecting the additional value to our previously existing
operations achieved with this acquisition&#146;s ability to expand production capacity and product line.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following table represents the combined results of operations on a pro-forma basis with
Natural Gas Services Group, Inc. and Screw Compression Systems, Inc. as if the acquisition had
occurred on January&nbsp;1, 2004.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>(Unaudited)<BR>
Pro Forma Results</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="88%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Twelve Months</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Ended</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">December 31, 2004</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Revenue</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">37,382</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Net income available to common stockholders</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,148</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Net income per common share, basic</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">0.67</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Net income per common share, diluted</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">0.59</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Summary of net assets acquired is as follows:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Current assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">8,274</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Other assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,047</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Intangibles</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,218</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Goodwill</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,468</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">23,007</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Current liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,180</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Notes payable</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,403</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Other liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,884</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,467</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Net assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16,540</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Acquisition expenses</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(418</TD>
    <TD nowrap>)</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Purchase price</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">16,122</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->6<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(4)&nbsp;Stock-Based Compensation</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><I>Adoption of SFAS No.&nbsp;123(R)</I>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Effective January&nbsp;1, 2006, the Company adopted the fair value recognition provisions of
Statement of Financial Accounting Standard 123(R) <I>&#147;Share-Based Payment&#148; </I>(&#147;SFAS 123(R)&#148;) using the
modified prospective transition method. In addition, the Securities and Exchange Commission issued
Staff Accounting Bulletin No.&nbsp;107 <I>&#147;Share-Based Payment&#148; </I>(&#147;SAB 107&#148;) in March, 2005, which provides
supplemental SFAS 123(R) application guidance based on the views of the SEC. Under the modified
prospective transition method, compensation cost recognized in the quarterly period ended September
30, 2006 includes: (a)&nbsp;compensation cost for all share-based payments granted prior to, but not yet
vested as of January&nbsp;1, 2006, based on the grant date fair value estimated in accordance with the
original provisions of SFAS No.&nbsp;123, and (b)&nbsp;compensation cost for all share-based payments granted
beginning January&nbsp;1, 2006, based on the grant date fair value estimated in accordance with the
provisions of SFAS 123(R). In accordance with the modified prospective transition method, results
for prior periods have not been restated. The adoption of SFAS 123(R) resulted in stock
compensation expense for the three and nine months ended September&nbsp;30, 2006 of $73 thousand and
$218 thousand, respectively, to income before income taxes.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Black-Scholes option-pricing model was used to estimate the option fair values. The
option-pricing model requires a number of assumptions, of which the most significant are expected
stock price volatility, the expected pre-vesting forfeiture rate and the expected option term (the
amount of time from the grant date until the options are exercised or expire). Expected volatility
was calculated based upon actual historical stock price movements over the most recent periods
ending September&nbsp;30, 2006. The expected option term was calculated using the &#147;simplified&#148; method
permitted by SAB 107. The expected forfeiture rate is based on historical experience and
expectations about future forfeitures.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prior to the adoption of SFAS 123(R), the Company accounted for stock-based awards to
employees using the intrinsic value method described in Accounting Principles Board Opinion (APB)
No.&nbsp;25, <I>Accounting for Stock Issued to Employees</I>, and its related interpretations. Accordingly, no
compensation expense has been recognized in the accompanying consolidated financial statements for
stock-based awards to employees or directors when the exercise price of the award is equal to or
greater than the quoted market price of the stock on the date of the grant.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><I>Pro-Forma Stock Compensation Expense for the Quarterly Period Ended September&nbsp;30, 2005</I>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For the three and nine month periods ended September&nbsp;30, 2005, the Company applied the
intrinsic value method of accounting for stock options as prescribed by APB 25. Since all options
granted during the three and nine month periods ended September&nbsp;30, 2005 had an exercise price
equal to the closing market price of the underlying common stock on the grant date, no compensation
expense was recognized. If compensation expense had been recognized based on the estimated fair
value of each option granted in accordance with the provisions of SFAS 123 as amended by Statement
of Financial Accounting Standard 148, our net income and net income per share would have been
reduced to the following pro-forma amounts (in thousands, except per share amounts):
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->7<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Three Months Ended</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Nine Months Ended</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">September 30</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">September 30</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Pro forma impact of fair value method</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Income applicable to common shares, as reported</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,091</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,060</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Compensation expenses regained under Opinion 25</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">21</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">21</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Pro-forma stock-based compensation costs under
the fair value method, net of related tax</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(47</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(106</TD>
    <TD nowrap>)</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Pro-forma income applicable to common shares
under the fair-value method</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,065</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,975</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><B>Earnings per common share</B></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Basic earnings per share reported</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.14</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.43</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Diluted earnings per share reported</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.12</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.37</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Pro-forma basic earnings per share under the
fair value method</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.14</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.42</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Pro-forma diluted earnings per share under the
fair value method</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.12</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.36</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pro-forma compensation expense under SFAS 123, among other computational differences,
does not consider potential pre-vesting forfeitures. Because of these differences, the pro-forma
stock compensation expense presented above for the prior three and nine month periods ended
September&nbsp;30, 2005 under SFAS 123 and the stock compensation expense recognized during the current
three and nine month periods ended September&nbsp;30, 2006 under SFAS 123(R) are not directly
comparable. In accordance with the modified prospective transition method of SFAS 123(R), the
prior comparative quarterly results have not been restated.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><I>Stock Option Plan</I>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Company&#146;s 1998 Stock Option Plan (the Plan), which is stockholder approved, permits the
grant of options to its employees for up to 550 thousand shares of common stock. The Company
believes that such awards better align the interests of its employees with those of its
stockholders. Option awards are generally granted with an exercise price equal to the market price
of the Company&#146;s stock at the date of grant; those option awards generally vest based on three
years of continuous service and have ten-year contractual terms. Certain option and share awards
provide for accelerated vesting if there is a change in control of the Company (as defined in the
Plan).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On June&nbsp;20, 2006, the 1998 Stock Option Plan was amended and approved by the stockholders.
The number of shares of common stock authorized for issuance under the 1998 Plan was increased from
150 thousand to 550 thousand. The last date that grants could be made was extended from December
17, 2008 to March&nbsp;1, 2016. The exercise price of incentive stock options granted to employees who
do not own more that 10% of our common stock was changed from not less that 140% of the fair market
value per share of our common stock on the date of grant to not less than 100% of the fair market
value of our common stock on the date of grant. The provision allowing the Compensation Committee
to increase, without stockholder approval, the number of shares of stock subject to the 1998 Plan
from 150 thousand shares to 400 thousand shares was eliminated. Also eliminated was a provision
allowing the Compensation Committee, in its sole discretion, to provide an optionee with the right
to exchange, in a cashless transaction, all or part of a stock option for shares of our common
stock on terms and conditions determined by the Compensation Committee.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->8<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The fair value of each option award is estimated on the date of grant using the
Black-Scholes option valuation model that uses the assumptions noted in the following table. The
risk-free rate for periods within the contractual life of the option is based on the U.S. Treasury
yield curve in effect at the time of grant. The expected life of options granted is derived from
the output of the option valuation model and represents the period of time that options granted are
expected to be outstanding; the range given below results from certain groups of employees
exhibiting different behavior. The Company uses historical stock data to estimate option exercise
and employee termination within the valuation model; separate groups of employees that have similar
historical exercise behavior are considered separately for valuation purposes.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="7">Three months Ended</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="7">Nine months Ended</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="7" style="border-bottom: 1px solid #000000">September 30,</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="7" style="border-bottom: 1px solid #000000">September 30,</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">2006</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Weighted average fair value
assumptions:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Risk free rate</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD nowrap align="right">6.75%-7.25</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD nowrap align="right">4.0%-7.25</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD nowrap align="right">6.75%-7.25</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD nowrap align="right">4.0%-7.25</TD>
    <TD nowrap>%</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Expected life</DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" nowrap align="right">10 yrs</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" nowrap align="right">10 yrs</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" nowrap align="right">10 yrs</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="2" nowrap align="right">10 yrs</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Expected volatility</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD align="right">39.0</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD nowrap align="right">39.0-47.0</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD align="right">39.0</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD nowrap align="right">39.0-47.0</TD>
    <TD nowrap>%</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Expected dividend yield</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD align="right">0.0</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD align="right">0.0</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD align="right">0.0</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">&nbsp;</TD>
    <TD align="right">0.0</TD>
    <TD nowrap>%</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A summary of option activity under the plan as of September&nbsp;30, 2006 is presented below.
For the three and nine months ended September&nbsp;30, 2006, the Company did not grant any options under
the 1998 Stock Option Plan.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Weighted</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Weighted</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Average</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Number</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Average</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Remaining</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Aggregate</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">of</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Exercise</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Contractual</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Intrinsic</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Stock Options</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Price</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Life (years)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Value</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><FONT style="white-space: nowrap">(in thousands)</FONT></TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Outstanding, January
1, 2006</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">146,668</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">7.69</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Granted</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Exercised</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(8,332</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6.35</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Forfeited or expired</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(9,000</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6.86</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Outstanding,
September&nbsp;30, 2006</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">129,336</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">7.83</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7.79</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">655</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Exercisable,
September&nbsp;30, 2006</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">86,998</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">7.45</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7.41</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">474</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No options were granted during the three and nine months ended September&nbsp;30, 2006. The
total intrinsic value or the difference between the exercise price and the market price on the date
of exercise, of options exercised during the three and nine months ended September&nbsp;30, 2006, was
approximately $50 thousand and $74 thousand, respectively. Cash received from stock options
exercised during the three and nine months ended September&nbsp;30, 2006 was $35 thousand and $53
thousand, respectively.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->9<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following table summarizes information about the options outstanding at September&nbsp;30,
2006:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="40%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="11" style="border-bottom: 1px solid #000000">Options Outstanding</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="7" style="border-bottom: 1px solid #000000">Options Exercisable</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Weighted</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Average</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Weighted</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Weighted</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Remaining</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Average</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Average</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left">Range of</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Contractual</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Exercise</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Exercise</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Exercise Prices</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Shares</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Life (years)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Price</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Shares</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Price</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">$0.00&#151;5.58
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">42,000</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">6.08</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">$</TD>
    <TD align="right" valign="top">3.98</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">40,000</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">$</TD>
    <TD align="right" valign="top">3.90</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">5.59 &#151; 9.43
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">77,336</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">8.53</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">8.75</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">36,998</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">8.72</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">9.44 &#151; 16.96
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10,000</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">9.25</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">16.96</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10,000</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">16.96</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">$0.00-16.96
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">129,336</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">7.79</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">$</TD>
    <TD align="right" valign="top">7.83</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">86,998</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">$</TD>
    <TD align="right" valign="top">7.45</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The summary of the status of the Company&#146;s unvested stock options as of September&nbsp;30,
2006 and changes during the nine months ended September&nbsp;30, 2006 is presented below.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Weighted</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">Average</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000">Unvested stock options:</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Shares</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Grant Date Fair Value</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Unvested at January&nbsp;1, 2006</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">75,333</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">10.34</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Granted</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Vested</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">25,328</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10.37</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Forfeited</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,667</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4.09</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Unvested at September&nbsp;30, 2006</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">42,338</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">11.45</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As of September&nbsp;30, 2006, there was approximately $329 thousand of unrecognized
compensation cost related to unvested options. Such cost is expected to be recognized over a
weighted-average period of 1.25&nbsp;years. Total compensation expense for stock options was $73
thousand and $218 thousand for the three and nine months ended September&nbsp;30, 2006, respectively.
An income tax benefit was recognized of approximately $27 thousand and $81 thousand for the three
and nine months ended September&nbsp;30, 2006, respectively.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(5)&nbsp;Inventory</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Inventory, net of reserves, consisted of the following amounts:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">December 31,</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">September 30,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2"><I>(unaudited)</I></TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Raw materials</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">11,771</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">13,275</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Finished Goods</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">774</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Work in process</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,952</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,894</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">14,723</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">17,943</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<P align="center" style="font-size: 10pt"><B><!-- Folio -->
</B>10<!-- /Folio -->
</DIV>


<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(6)&nbsp;Long Term Debt</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On March&nbsp;24, 2006, we entered into a Modification Agreement with Western National Bank,
Midland, Texas. This Modification Agreement reduced the rate per annum from prime rate plus 0.5%,
to the prime rate. This Modification Agreement was effective April&nbsp;1, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On August&nbsp;28, 2006, we entered into another Modification Agreement with Western National Bank,
Midland, Texas. This Modification Agreement reduced the rate per annum from prime to 7.5%
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On October&nbsp;26, 2006, we entered into a Seventh Amended and Restated Loan Agreement with
Western National Bank for the purpose of consolidating our existing Term Loan and Advancing Line of
Credit Facilities into one term loan facility and extending, renewing and increasing our Revolving
Line of Credit Facility. The loan facilities provided for under the Seventh Amended and Restated
Loan Agreement are evidenced by a Multiple Advance Term Promissory Note, in the original principal
amount of $16.9&nbsp;million made by Natural Gas Services Group, Inc., bearing interest at a fixed rate
of 7.5% per annum and maturing on October&nbsp;1, 2011, and a Revolving Line of Credit Promissory Note,
in the original principal amount of $40 Million, made by Natural Gas Services Group, Inc., bearing
interest at a fixed rate of 7.5% per annum and maturing on October&nbsp;1, 2008.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The amounts available for borrowing under our Revolving Line of Credit Promissory Note are
subject to a borrowing base limitation equal to the lesser of: (a)&nbsp;the face amount of such Note and
(b)&nbsp;a borrowing base amount. The borrowing base amount is based on a percentage of the value of our
accounts receivable, lease receivables, equipment, work in process and inventory, less the
aggregate outstanding principal balances of our Revolving Line of Credit Note and Multiple Advance
Term Promissory Note. At the end of each month, we provide a borrowing base report to Western
National Bank setting forth our calculation of the borrowing base amount. The bank may, but is not
obligated to, re-determine the borrowing base in its sole discretion. If the bank does not
re-determine the borrowing base, the amount of the borrowing base set forth in the borrowing base
report furnished by us to the bank at the end of each month is deemed to be the re-determined
borrowing base, until the bank gives notice to us of a new borrowing base. At October&nbsp;26, 2006, the
borrowing base was $32.0&nbsp;million.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If the outstanding principal balance of our Revolving Line of Credit Promissory Note at any
time exceeds the then applicable borrowing base, we must, within fifteen business days after notice
from the bank, first prepay the principal amount outstanding under such Note in an aggregate amount
at least equal to such excess, together with accrued interest on the amount prepaid to the date of
such prepayment and, to the extent the excess is not eliminated by the prepayment of such Note, we
must next prepay the outstanding principal of our Multiple Advance Term Promissory Note, in an
amount equal to the remaining unpaid excess amount.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->11<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Revolving Line of Credit Facility. </I>Our revolving line of credit facility allows us to
borrow, repay and re-borrow funds drawn under this facility. After entering into the Sixth Amended
and Restated Loan Agreement, the total amount that we could borrow and have outstanding at any one
time was limited to the lesser of $10.0&nbsp;million or the amount available for advances under a
&#147;borrowing base&#148; calculation established by the bank. As of September&nbsp;30, 2006, the amount
available for revolving line of credit advances under our borrowing base was $10.0&nbsp;million. The
amount of the borrowing base is based primarily upon our receivables, equipment and inventory. The
borrowing base is re-determined by the bank on a monthly basis. If, as a result of the
re-determination of the borrowing base, the aggregate outstanding principal amount of the notes
payable to the bank under the Loan Agreement exceeds the borrowing base, we must first prepay the
principal of the revolving line of credit note in an amount equal to such excess, and if the excess
is not eliminated by the prepayment, we must then prepay the principal of the other notes payable
under the Loan Agreement until the excess is eliminated. Interest only on borrowings under our
revolving line of credit facility is payable monthly on the first day of each month. Loans made to
us under the revolving line of credit accrued interest at the prime rate until August&nbsp;28, 2006, at
which time such loans began to accrue interest at a rate of 7.5%. Upon entering into the Sixth
Amended and Restated Loan Agreement, the revolving line of credit was renewed; the maturity was
extended from January&nbsp;1, 2006 to December&nbsp;1, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>$10.0 Million Multiple Advance Term Loan Facility. </I>This multiple advance term loan facility
allowed us to request advances from time to time through March&nbsp;14, 2006 in an aggregate amount not
to exceed the lesser of $10.0&nbsp;million or the amount available for advances under the borrowing base
established by the bank. Re-borrowings are not permitted under this facility. As of September&nbsp;30,
2006, no additional amounts were available for advances under this facility, and the principal
amount outstanding under this multiple term advance loan facility at September&nbsp;30, 2006 was $9.2
million. Loans made to us under this facility accrued interest at the prime rate until August&nbsp;28,
2006, at which time such loans began to accrue interest at a rate of 7.5%. Interest only under this
credit facility was due and payable on the first day of each month commencing May&nbsp;1, 2005 and
continuing through April&nbsp;1, 2006. Principal under this credit facility is due and payable in 59
monthly installments in an amount equal to 1/60<SUP style="font-size: 85%; vertical-align: text-top">th</SUP> of the outstanding principal balance
on May&nbsp;1, 2006 with a like installment due on the first day of each succeeding month through March
1, 2011, with interest on the unpaid principal balance being due and payable on the same dates as
principal payments. All outstanding principal and unpaid interest is due on April&nbsp;1, 2011.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>Advancing Line of Credit Facility. </I>This advancing line of credit facility allowed us to
request advances in an aggregate amount not to exceed the lesser of $10.0&nbsp;million or the amount
available for advances under the borrowing base established by the bank. Re-borrowings are not
permitted under this facility. As of September&nbsp;30, 2006, additional advances under this facility
were not permitted. The principal amount outstanding under this facility at September&nbsp;30, 2006 was
$1.9&nbsp;million. Loans made to us under this facility accrued interest at the prime rate until August
28, 2006, at which time such loans began to accrue interest at a rate of 7.5%. Interest only under
this credit facility was due and payable on the 15<SUP style="font-size: 85%; vertical-align: text-top">th</SUP> day of each month commencing
December&nbsp;15, 2003 and continuing through November&nbsp;15, 2004. Principal under this credit facility is
due and payable in 59&nbsp;monthly installments of $167 thousand each, commencing December&nbsp;15, 2004
through April&nbsp;15, 2006, and installments of $57 thousand each from May&nbsp;15, 2006 and continuing
through October&nbsp;15, 2009. Principal payments also include payments of 1/60<SUP style="font-size: 85%; vertical-align: text-top">th</SUP> of the sum
of all advances made between December&nbsp;15, 2004 and December&nbsp;15, 2005, such amounts calculated
quarterly. Interest on the unpaid principal balance is due and payable on the same dates as
principal payments. All outstanding principal and unpaid interest is due on November&nbsp;15, 2009.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->12<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>$8.0 Million Term Loan. </I>This term loan is a traditional term loan facility. We may not
request additional advances under this facility and re-borrowings are not permitted. As of
September&nbsp;30, 2006, the principal amount outstanding under this term loan was $6.1&nbsp;million. Loans
made to us under this credit facility accrued interest at the prime rate until August&nbsp;28, 2006, at
which time such loans began to accrue interest at a rate of 7.5%. Principal under this credit
facility is due and payable in 84&nbsp;monthly installments of $95 thousand each, commencing February&nbsp;1,
2005 and continuing through December&nbsp;1, 2011. Interest on the unpaid principal balance is due and
payable on the same dates as principal payments. All outstanding principal and unpaid interest is
due on January&nbsp;1, 2012.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The maturity dates of the loan facilities may be accelerated by the bank upon the occurrence
of an event of default under the Loan Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(7)&nbsp;Common Stock Warrants and Options</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In 2001, the Company completed an offering of units consisting of subordinated debt and
warrants. Each unit consisted of a $25,000 10% subordinated note due December&nbsp;31, 2006 and a
five-year warrant to purchase 10,000 shares of the Company&#146;s common stock at $3.25 per share. On
August&nbsp;26, 2005, we prepaid all of the outstanding 10% subordinated notes that were due December
31, 2006. As of September&nbsp;30, 2006, 50,000 of these warrants are outstanding.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In March&nbsp;2001 and April&nbsp;2002, warrants to purchase 68,524 thousand shares of common stock at
$2.50 per share and 16,472 shares at $3.25 per share, respectively, were issued to certain board
members and stockholders as compensation for their debt guarantees. As of September&nbsp;30, 2006,
warrants to purchase 30,832 shares at $2.50 per share and 5,318 shares at $3.25 per share remained
outstanding.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In October&nbsp;2002, the Company closed an initial public offering in which it sold 1,500,000
shares of common stock and warrants to purchase 1,500,000 shares of common stock for a total of
$7.9&nbsp;million. The warrants were exercisable anytime through October&nbsp;21, 2006 at $6.25 per share. In
connection with the offering, the underwriter received options to purchase 150,000 shares of common
stock at $6.25 per share and warrants at $0.3125 per share. The warrants, if purchased by the
underwriter, will contain an exercise price of $7.81 per share. The underwriter&#146;s options expire in
October&nbsp;2007 and include a cashless exercise provision utilizing the Company&#146;s common stock. As of
September&nbsp;30, 2006, there were 14,000 of these warrants outstanding.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On August&nbsp;26, 2005, we entered into a non-statutory Stock Option Agreement with Mr.&nbsp;Steve C.
Taylor, our CEO and President. The Stock Option Agreement grants to Mr.&nbsp;Taylor a ten-year option
to purchase 45,000 shares of our common stock at an exercise price equal to $9.22 (the fair market
value of our common stock on January&nbsp;13, 2005, the date we initially hired Mr.&nbsp;Taylor), with
15,000 shares vesting on each of January&nbsp;13, 2006, 2007 and 2008. The options expire ten years
from the date of grant.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Compensation expense of $73 thousand and $218 thousand was recognized related to options that
vested in the three and nine month periods ended September&nbsp;30, 2006, respectively.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->13<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(8)&nbsp;Sale of Common Stock</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On March&nbsp;8, 2006, we sold 2,468,000 shares of our common stock pursuant to a public
offering at a price of $17.50 per share, resulting in net proceeds to us of $40.7&nbsp;million. We did
not receive any proceeds from sales by certain selling stockholders. We granted the underwriter an
option for a period of 30&nbsp;days to purchase up to an additional 427,500 shares to cover
over-allotments, if any. On March&nbsp;27, 2006, the underwriter exercised its over-allotment option and
on March&nbsp;30, 2006, the Company sold an additional 427,500 shares, resulting in proceeds to the
Company of $7.1&nbsp;million, in addition to the net proceeds of $40.7&nbsp;million from the sale of the
2,468,000 shares of common stock on March&nbsp;8, 2006. The net proceeds after offering costs to us
were $47.1&nbsp;million and a portion has been used to reduce our bank debt by $5.0&nbsp;million.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(9)&nbsp;Earnings per Share</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following table reconciles the numerators and denominators of the basic and diluted
earnings per share computation.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">Three months Ended</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">Nine months Ended</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">September 30,</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">September 30,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Numerator:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Net income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,091</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,364</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,060</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,268</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Denominator for basic net income per common share:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Weighted average common shares outstanding</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,606</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,960</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,077</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,199</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Denominator for diluted net income per share:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Weighted average common shares outstanding</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,606</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,960</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,077</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,199</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Dilutive effect of stock options and warrants</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,165</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">86</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,136</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">65</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Diluted weighted average shares</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,771</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">12,046</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,213</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,264</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Earnings per common share:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Basic</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.14</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.20</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.43</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.47</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Diluted</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.12</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.20</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.37</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">0.47</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->14<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(10)&nbsp;Segment Information</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;FAS No.&nbsp;131, <I>Disclosures About Segments of an Enterprise and Related Information</I>,
establishes standards for public companies relating to the reporting of financial and descriptive
information about their operating segments in financial statements. Operating segments are
components of an enterprise about which separate financial information is available that is
evaluated regularly by chief operating decision makers in how to allocate resources and in
assessing performance.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">&nbsp;&nbsp;<B>The Company identifies its segments based upon major revenue sources as follows:</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>For the three months ended September&nbsp;30, 2006:</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Service &#038;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Sales</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Maintenance</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Rental</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Corporate</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Total</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Revenue</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">10,880</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">209</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">6,041</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">17,130</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating costs and
expenses</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,351</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">170</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,240</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,679</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">13,440</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">2,529</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">39</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">3,801</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">$</TD>
    <TD align="right">(2,679</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">3,690</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">*Segment Assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">134,039</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">134,039</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>For the three months ended September&nbsp;30, 2005:</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Service &#038;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Sales</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Maintenance</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Rental</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Corporate</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Total</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Revenue</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">7,479</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">610</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">4,371</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">12,460</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating costs and
expenses</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">5,778</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">341</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,782</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,352</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10,253</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">1,701</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">269</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">2,589</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">$</TD>
    <TD align="right">(2,352</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">2,207</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">*Segment Assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">85,583</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">85,583</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>For the nine months ended September&nbsp;30, 2006:</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Service &#038;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Sales</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Maintenance</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Rental</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Corporate</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Total</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Revenue</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">28,509</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">749</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">16,908</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">46,166</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating costs and
expenses</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">22,472</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">567</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,513</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,959</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">37,511</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">6,037</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">182</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">10,395</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">$</TD>
    <TD align="right">(7,959</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">8,655</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">*Segment Assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">134,039</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">134,039</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>For the nine months ended September&nbsp;30, 2005:</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Service &#038;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Sales</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Maintenance</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Rental</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Corporate</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3">Total</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Revenue</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">22,066</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">1,770</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">11,696</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">35,532</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating costs and
expenses</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16,977</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,145</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,539</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,626</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">29,287</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 1px solid #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Operating income</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">5,089</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">625</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">7,157</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="right">$</TD>
    <TD align="right">(6,626</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">6,245</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">*Segment Assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">85,583</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">$</TD>
    <TD align="right">85,583</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="19" align="left" style="border-top: 3px double #000000">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Management does not track assets by segment</TD>
</TR>

</TABLE>


<P align="center" style="font-size: 10pt"><!-- Folio -->15<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>(11)&nbsp;Legal Proceedings</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are a party to one lawsuit arising in the ordinary course of our business. While
management is unable to predict the ultimate outcome of this action, management believes that any
ultimate liability arising from this action will not have a material adverse effect on our
consolidated financial position, results of operations or cash flow. Except as discussed herein,
we are not currently a party to any other legal proceedings and we are not aware of any other
threatened litigation.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">**********************
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->16<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="105"></A>
</DIV>

<DIV align="left" style="margin-top: 12pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt; background: transparent; color: #000000">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD></TD>
</TR>
<TR valign="top">
    <TD nowrap align="left"><B>Item&nbsp;2.</B></TD>
    <TD>&nbsp;</TD>
    <TD><B>MANAGEMENT&#146;S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS</B></TD>
</TR>
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<I>The discussion and analysis of our financial condition and results of operations are
based on, and should be read in conjunction with, our condensed consolidated financial statements
and the related notes included elsewhere in this report and in our December&nbsp;31, 2005 </I><I>Form 10-K</I><I> on
file with the SEC. All amounts reported in tables are in thousands of dollars unless otherwise
noted.</I>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Overview</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We fabricate, manufacture, rent and sell natural gas compressors and related equipment. Our
primary focus is on the rental of natural gas compressors. Our rental contracts generally provide
for initial terms of six to 24&nbsp;months. After the initial term of our rental contracts, most of our
customers have continued to rent our compressors on a month-to-month basis. Rental amounts are paid
monthly in advance and include maintenance of the rented compressors. As of September&nbsp;30, 2006, we
had 909 natural gas compressors totaling 105,213 horsepower rented to 85 third parties, compared to
756 natural gas compressors totaling 83,702 horsepower rented to 76 third parties at September&nbsp;30,
2005. Of the 909 natural gas compressors, 95 were rented to Dominion Exploration &#038; Production, Inc.
and its affiliates.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We also fabricate natural gas compressors for sale to our customers, designing compressors to
meet unique specifications dictated by well pressures, production characteristics and particular
applications for which compression is sought. Fabrication of compressors involves the purchase by
us of engines, compressors, coolers and other components, and then assembling these components on
skids for delivery to customer locations. These major components of our compressors are acquired
through periodic purchase orders placed with third-party suppliers on an &#147;as needed&#148; basis, which
presently requires a three to four month lead time with delivery dates scheduled to coincide with
our estimated production schedules. Although we do not have formal continuing supply contracts with
any major supplier, we believe we have adequate alternative sources available. In the past, we have
not experienced any sudden and dramatic increases in the prices of the major components for our
compressors. However, the occurrence of such an event could have a material adverse effect on the
results of our operations and financial condition, particularly if we were unable to increase our
rental rates and sales prices proportionate to any such component price increases.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We also manufacture a proprietary line of compressor frames, cylinders and parts, known as our
CiP (Cylinder-in-Plane) product line. We use finished CiP component products in the fabrication of
compressor units for sale or rental by us or sell the finished component products to other
compressor fabricators. We also design, fabricate, sell, install and service flare stacks and
related ignition and control devices for onshore and offshore incineration of gas compounds such as
hydrogen sulfide, carbon dioxide, natural gas and liquefied petroleum gases. To provide customer
support for our compressor and flare sales businesses, we stock varying levels of replacement parts
at our Midland, Texas facility and at field service locations. We also provide an exchange and
rebuild program for screw compressors and maintain an inventory of new and used compressors to
facilitate this business.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We provide service and maintenance to our customers under written maintenance contracts or on
an as required basis in the absence of a service contract. As of September&nbsp;30, 2006, we had written
maintenance agreements with third parties relating to 47 compressors, the majority of which were
owned by Dominion Exploration. Maintenance agreements typically have terms of nine months to one
year and require payment of a monthly fee.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->17<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following table sets forth our revenues from each of our three business segments for the
periods presented:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="52%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">Three months Ended</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">Nine months Ended</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">September 30,</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">September 30,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Sales</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">7,479</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">10,880</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">22,066</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">28,509</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Service and maintenance</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">610</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">209</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,770</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">749</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Rental</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,371</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,041</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,696</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16,908</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Total</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">12,460</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">17,130</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">35,532</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">46,166</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On January&nbsp;3, 2005, we completed the acquisition of Screw Compression Systems, Inc., or &#147;SCS,&#148;
for consideration consisting of $8.0&nbsp;million in cash, subordinated promissory notes payable by us
to the former stockholders of SCS in the aggregate principal amount of $3.0&nbsp;million, and 609,756
shares of our common stock. As a result of this acquisition, our results of operations for periods
before and after the completion of the acquisition may not be comparable.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Historically, the majority of our revenues and income from operations has come from our
compressor rental business. The acquisition of SCS, which is engaged primarily in the business of
custom fabrication of compressors for sale to third parties, significantly altered the mix of our
revenues, with compressor sales now contributing the largest percentage of our revenues. Margins,
exclusive of depreciation, for our rental business have recently averaged 60% to 65%, while margins
for the compressor sales business have recently averaged 20%. As a result of the SCS acquisition,
our overall margins have declined in 2005 compared to prior periods because of the difference in
our product mix. Our strategy for growth is focused on our compressor rental business, and we
intend to use the additional fabrication capacity now available through SCS to expand our rental
fleet while continuing SCS&#146;s core custom fabrication business. As our rental business grows and
contributes a larger percentage of our total revenues, we expect our overall margins to improve
from those experienced in 2005.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The oil and gas equipment rental and services industry is cyclical in nature. The most
critical factor in assessing the outlook for the industry is the worldwide supply and demand for
natural gas and the corresponding changes in commodity prices. As demand and prices increase, oil
and gas producers increase their capital expenditures for drilling, development and production
activities. Generally, the increased capital expenditures ultimately result in greater revenues and
profits for services and equipment companies.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In general, we expect our overall business activity and revenues to track the level of
activity in the natural gas industry, with changes in domestic natural gas production and
consumption levels and prices more significantly affecting our business than changes in crude oil
and condensate production and consumption levels and prices. We also believe that demand for
compression services and products is driven by declining reservoir pressure in maturing natural gas
producing fields and, more recently, by increased focus by producers on non-conventional natural
gas production, such as coalbed methane, gas shales and tight gas, which typically requires more
compression than production from conventional natural gas reservoirs.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->18<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Demand for our products and services was strong throughout 2004 and 2005. We believe demand
will remain strong throughout 2006 due to high oil and natural gas prices and increased demand for
natural gas. Because of these market fundamentals for natural gas, we believe the long-term trend
of activity in our markets is favorable. However, these factors could be more than offset by other
developments affecting the worldwide supply and demand for natural gas.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For fiscal year 2006, our forecasted capital expenditures are $27 to $32&nbsp;million, primarily
for additions to our compressor rental fleet. We believe that the proceeds from our recently
completed public offering of common stock, together with funds available to us under our bank
credit facility and cash flows from operations will be sufficient to satisfy our capital and
liquidity requirements through 2006. We may further require additional capital to fund any
unanticipated expenditures, including any acquisitions of other businesses. Additional capital may
not be available to us when we need it or on acceptable terms.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Results of Operations</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B><I>Three months ended September&nbsp;30, 2005, compared to the three months ended September&nbsp;30, 2006.</I></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The table below shows our revenues, percentage of total revenues, gross profit, exclusive
of depreciation, and gross profit margin of each of our segments for the three months ended
September&nbsp;30, 2005 and September&nbsp;30, 2006. The gross profit margin is the ratio, expressed as a
percentage, of gross profit, exclusive of depreciation, to total revenue.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="20%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14">Revenue</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14">Gross Profit, exclusive of depreciation</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14" style="border-bottom: 1px solid #000000">Three months Ended September 30,</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14" style="border-bottom: 1px solid #000000">Three months Ended September 30,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Sales</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">7,479</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">60</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">10,880</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">64</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,701</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">23</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,529</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">23</TD>
    <TD nowrap>%</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Service and
Maintenance</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">610</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">5</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">209</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">1</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">269</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">44</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">39</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">19</TD>
    <TD nowrap>%</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Rental</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,371</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">35</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">6,041</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">35</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,589</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">59</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,801</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">63</TD>
    <TD nowrap>%</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Total</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">12,460</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">17,130</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">4,559</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">37</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">6,369</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">37</TD>
    <TD nowrap>%</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total revenue increased from $12.5&nbsp;million to $17.1&nbsp;million, or 37.5%, for the three
months ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005. This was
mainly the result of increased rental revenue and additional compressor sales. Rental revenue
increased 38.2% and sales revenue increased 45.5% and these were offset by a decrease in service
and maintenance revenue of 65.7%.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rental revenue increased from $4.4&nbsp;million to $6.0&nbsp;million, or 38.2%, for the three months
ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005. This increase was
the result of additional units added to our rental fleet and rented to third parties. The company
ended the period with 1052 compressor packages in its rental fleet, up from 805 units at September
30, 2005. The rental fleet has a utilization of 86.4% as of September&nbsp;30, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sales revenue increased from $7.5&nbsp;million to $10.9&nbsp;million, or 45.5%, for the three months
ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005. The sales revenue
during the three months ended September&nbsp;30, 2006, included $1.5&nbsp;million for the sale of rental
equipment to an existing customer. Sales from outside sources included: (1)&nbsp;compressor unit sales
(including used rental equipment), (2)&nbsp;flare sales, (3)&nbsp;parts sales and (4)&nbsp;compressor rebuilds.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->19<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Service and maintenance revenue decreased from $610 thousand to $209 thousand, or 65.7%, for
the three months ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005.
This decrease was mainly the result of the change in our maintenance contract in Michigan with
Dominion Resources beginning January&nbsp;1, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The overall gross margin percentage, exclusive of depreciation, increased to 37.2% for the
three months ended September&nbsp;30, 2006, from 36.6% for the same period ended September&nbsp;30, 2005.
This is mainly the result of increased margin on our fleet rental activity.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Selling expense increased from $269 thousand, to $331 thousand or 23.0% for the three months
ended September&nbsp;30, 2006, as compared to the same period ended September&nbsp;30, 2005. This increase is
the result of increased commissions as a result of increased sales and additional salaries for
sales people added to our sales force.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General and administrative expenses decreased from $1.0&nbsp;million, to $851 thousand or 15.5% for
the three months ended September&nbsp;30, 2006, as compared to the same period ended September&nbsp;30, 2005.
This decrease is mainly due to a reduction in the legal expense, officer salaries. The decrease in
officer salaries from 2005 to current year was the result of the retirement of former CEO and also
the resignation of the Vice President of the Michigan Area.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Depreciation and amortization expense increased from $1.1&nbsp;million, to $1.5&nbsp;million or 39.1%
for the three months ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30,
2005. This increase was the result of 247 new gas compressor rental units being added to the
rental fleet from September&nbsp;30, 2005 to September&nbsp;30, 2006, thus increasing the depreciable base.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other income net of other expense increased $414 thousand for the three months ended September
30, 2006, compared to the same period ended September&nbsp;30, 2005. This increase is mainly the result
of additional interest income from our short-term investment account.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest expense decreased 24.2% for the three months ended September&nbsp;30, 2006, compared to
the same period ended September&nbsp;30, 2005, mainly due to decreased loan balances financing rental
equipment.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provision for income tax increased from $641 thousand to $1.4&nbsp;million or 116.5%, and is the
result of the increase in taxable income.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->20<!-- /Folio -->
</DIV>


<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B><I>Nine months ended September&nbsp;30, 2005, compared to the nine months ended September&nbsp;30, 2006.</I></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The table below shows our revenues, percentage of total revenues, gross profit, exclusive
of depreciation, and gross profit margin of each of our segments for the nine months ended
September&nbsp;30, 2005 and September&nbsp;30, 2006. The gross profit margin is the ratio, expressed as a
percentage, of gross profit, exclusive of depreciation, to total revenue.
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="20%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14">Revenue</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14">Gross Profit, exclusive of depreciation</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14" style="border-bottom: 1px solid #ffffff">Nine months Ended September 30,</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="14" style="border-bottom: 1px solid #ffffff">Nine months Ended September 30,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">2005</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6">2006</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR style="font-size: 1px">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="7" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="7" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="7" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="7" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Sales</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">22,066</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">62</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">28,509</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">62</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,089</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">23</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">6,037</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">21</TD>
    <TD nowrap>%</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Service and
Maintenance</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,770</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">5</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">749</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">2</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">625</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">35</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">182</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">24</TD>
    <TD nowrap>%</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Rental</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,696</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">33</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">16,908</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">37</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">7,157</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">61</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10,395</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">61</TD>
    <TD nowrap>%</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Total</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">35,532</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">46,166</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">12,871</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">36</TD>
    <TD nowrap>%</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">16,614</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">36</TD>
    <TD nowrap>%</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Total revenue increased from $35.5&nbsp;million to $46.2&nbsp;million, or 29.9%, for the nine
months ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005. This was
mainly the result of increased rental revenue and additional compressor sales. Rental revenue
increased 44.6% and sales revenue increased 29.2% and these were offset by a decrease in service
and maintenance revenue of 57.7%.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Rental revenue increased from $11.7&nbsp;million to $16.9&nbsp;million, or 44.6%, for the nine months
ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005. This increase was
the result of additional units added to our rental fleet and rented to third parties. The company
ended the period with 1052 compressor packages in its rental fleet, up from 805 units at September
30, 2005. The rental fleet has a utilization of 86.4% as of September&nbsp;30, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sales revenue increased from $22.1&nbsp;million to $28.5&nbsp;million, or 29.2%, for the nine months
ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005. This increase was
mainly from the $4.1&nbsp;million in sales of rental equipment to an existing rental customer. Sales
from outside sources included: (1)&nbsp;compressor unit sales (including used rental equipment), (2)
flare sales, (3)&nbsp;parts sales and (4)&nbsp;compressor rebuilds.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Service and maintenance revenue decreased from $1.8&nbsp;million to $749 thousand, or 57.7%, for
the nine months ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005.
This decrease was mainly the result of the change in our maintenance contract in Michigan with
Dominion Resources beginning January&nbsp;1, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The overall gross margin percentage, exclusive of depreciation, remained constant with only a
slight decrease to 36.0% for the nine months ended September&nbsp;30, 2006, from 36.2% for the same
period ended September&nbsp;30, 2005.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Selling expense increased from $750 thousand, to $958 thousand or 27.7% for the nine months
ended September&nbsp;30, 2006, as compared to the same period ended September&nbsp;30, 2005. This increase is
the result of increased commissions and also added salaries for sales people added to our sales
force.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->21<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;General and administrative expenses remained flat from $2.9&nbsp;million, to $2.9&nbsp;million for the
nine months ended September&nbsp;30, 2006, as compared to the same period ended September&nbsp;30, 2005.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Depreciation and amortization expense increased from $3.0&nbsp;million to $4.1&nbsp;million or 36.6% for
the nine months ended September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005.
This increase was the result of 247 new gas compressor rental units being added to rental fleet
from September&nbsp;30, 2005 to September&nbsp;30, 2006, thus increasing the depreciable base.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Other income net of other expense increased by $964 thousand for the nine months ended
September&nbsp;30, 2006, compared to the same period ended September&nbsp;30, 2005. This increase is mainly
the result of additional interest income from our short-term investment account as a result of
increased cash balances from our March&nbsp;2006 offering.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Interest expense decreased 9.1% for the nine months ended September&nbsp;30, 2006, compared to the
same period ended September&nbsp;30, 2005, mainly due to decreases in our loan balances. We made a one
time payment of $5&nbsp;million from the offering proceeds on our term loans and continued our normal
amortization of the existing debt.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Provision for income tax increased from $1.8&nbsp;million to $3.1&nbsp;million or 72.2%, and is the
result of the increase in taxable income.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Critical Accounting Policies and Practices</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A discussion of our critical accounting policies is included in the Company&#146;s Form 10-K
for the year ended December&nbsp;31, 2005.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Effective January&nbsp;1, 2006, the Company adopted the fair value recognition provisions of
Statement of Financial Accounting Standard 123(R) <I>&#147;Share-Based Payment&#148; </I>(&#147;SFAS 123(R)&#148;) using the
modified prospective transition method. In addition, the Securities and Exchange Commission issued
Staff Accounting Bulletin No.&nbsp;107 <I>&#147;Share-Based Payment&#148; </I>(&#147;SAB 107&#148;) in March, 2005, which provides
supplemental SFAS 123(R) application guidance based on the views of the SEC. Under the modified
prospective transition method, compensation cost recognized in the quarterly period ended September
30, 2006 includes: (a)&nbsp;compensation cost for all share-based payments granted prior to, but not yet
vested as of January&nbsp;1, 2006, based on the grant date fair value estimated in accordance with the
original provisions of SFAS No.&nbsp;123, and (b)&nbsp;compensation cost for all share-based payments granted
beginning January&nbsp;1, 2006, based on the grant date fair value estimated in accordance with the
provisions of SFAS 123(R). In accordance with the modified prospective transition method, results
for prior periods have not been restated. The adoption of SFAS 123(R) resulted in stock
compensation expense for the nine months ended September&nbsp;30, 2006 of $218 thousand to income before
income taxes.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Recently Issued Accounting Pronouncements</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On December&nbsp;16, 2004, the FASB published FASB Statement No.&nbsp;123 (revised 2004),
<I>Share-Based Payment </I>(&#147;Statement 123R&#148;), requiring that the compensation cost relating to
share-based payment transactions be recognized in financial statements. That cost will be measured
based on the fair value of the equity or liability instruments issued. We adopted Statement 123 (R)
as of January&nbsp;1, 2006. See Note 4 for discussion of the impact of the adoption of Statement No.&nbsp;123
(R).
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->22<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Liquidity and Capital Resources</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Historically, we have funded our operations through public and private offerings of our
equity securities, subordinated debt, bank borrowings and cash flow from operations. Proceeds of
financings were primarily used to pay debt and to fund the manufacture and fabrication of
additional units for our rental fleet of natural gas compressors.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;At September&nbsp;30, 2006, we had cash, cash equivalents and short-term investments of $31.4
million, working capital of $45.7&nbsp;million and total debt of $19.3&nbsp;million of which $4.8&nbsp;million was
classified as current. We had positive net cash flow from operating activities of $7.1&nbsp;million
during the first nine months of 2006. This was primarily from net income of $5.3&nbsp;million, an
increase in accounts payable and accrued liabilities of $1.5&nbsp;million, an increase in deferred taxes
of $3.1&nbsp;million offset by an increase in inventories of $3.2&nbsp;million during the nine months ended
September&nbsp;30, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For the nine months ended September&nbsp;30, 2006, we invested $21.6&nbsp;million in equipment for our
rental fleet and service vehicles. We financed this activity with bank debt, cash flow from
operations and public offering proceeds. In addition we have repaid $10.4&nbsp;million of our existing
debt.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On March&nbsp;8, 2006, we sold 2,468,000 shares of our common stock pursuant to a public offering
at a price of $17.50 per share, resulting in net proceeds to us of $40.7&nbsp;million. We did not
receive any proceeds from sales by certain selling stockholders. We granted the underwriter an
option for a period of 30&nbsp;days to purchase up to an additional 427,500 shares to cover
over-allotments, if any. On March&nbsp;27, 2006, the underwriter exercised its over-allotment option and
on March&nbsp;30, 2006, the Company sold an additional 427,500 shares, resulting in proceeds to the
Company of $7.1&nbsp;million, in addition to the net proceeds of $40.7&nbsp;million from the sale of the
2,468,000 shares of common stock on March&nbsp;8, 2006. The net proceeds after offering costs to us
were $47.2&nbsp;million and a portion has been used to reduce our bank debt by $5.0&nbsp;million. The
remainder will be used for the 2006 and 2007 capital expenditure budget, working capital and
general corporate purposes.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B><I>Contractual Obligations and Commitments</I></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have contractual obligations and commitments that affect our consolidated results of
operations, financial condition and liquidity. The following table is a summary of our significant
cash contractual obligations:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="23%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="4%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="26">Obligation Due in Period</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="26" style="border-bottom: 1px solid #000000"><I>(in thousands of dollars)</I></TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">After 5</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006(1)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2007</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2008</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2009</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2010</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Years</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">Total</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Credit facility (secured)</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">961</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,844</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,844</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,568</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,156</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,905</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">17,278</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Interest on credit facility(2)</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">315</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,080</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">792</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">514</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">261</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">72</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,034</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Subordinated debt</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,000</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,000</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,000</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Facilities and office leases</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">32</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">129</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">62</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">29</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">29</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">106</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">387</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Total</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,308</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">6,053</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">5,698</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">4,111</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">3,446</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,083</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">22,699</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">(1)</TD>
    <TD>&nbsp;</TD>
    <TD>For the three months remaining in 2006.</TD>
</TR>

<TR style="font-size: 3pt"><TD>&nbsp;</TD></TR>

<TR valign="top">
    <TD nowrap align="left">(2)</TD>
    <TD>&nbsp;</TD>
    <TD>Assumes no change in the interest rate.</TD>
</TR>

</TABLE>


<P align="center" style="font-size: 10pt"><!-- Folio -->23<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B><I>Senior Bank Borrowings</I></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On January&nbsp;03, 2006, we entered into a Sixth Amended and Restated Loan Agreement with
Western National Bank, Midland, Texas, provides for the following loan facilities:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>$8.0 Million Term Loan Facility;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>$10.0 Million Multiple Advance Term Loan Facility;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Revolving Line of Credit Facility; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Advancing Line of Credit Facility.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All outstanding principal under our $10.0 Million Multiple Advance Term Loan Facility is due
and payable on April&nbsp;1, 2011, and all outstanding principal under our $8.0 Million Term Loan
Facility is due and payable on January&nbsp;1, 2012. The outstanding principal balance of our Advancing
Line of Credit Facility is due and payable on November&nbsp;15, 2009.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our Revolving Line of Credit Facility matures on December&nbsp;1, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On March&nbsp;8, 2006, we paid an additional $5.0&nbsp;million on the principal of the Advancing Line of
Credit Facility.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On March&nbsp;24, 2006, we entered into a Modification Agreement with Western National Bank,
Midland, Texas. This Modification Agreement reduced the rate per annum from prime rate plus 0.5%,
to the prime rate. This Modification Agreement was effective April&nbsp;1, 2006.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On August&nbsp;28, 2006, we entered into another Modification Agreement with Western National Bank,
Midland, Texas. This Modification Agreement reduced the rate per annum from prime to 7.5%.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On October&nbsp;26, 2006, we entered into a Seventh Amended and Restated Loan Agreement with
Western National Bank for the purpose of consolidating our existing Term Loan and Advancing Line of
Credit Facilities into one term loan facility and extending, renewing and increasing our Revolving
Line of Credit Facility. The loan facilities provided for under the Seventh Amended and Restated
Loan Agreement are evidenced by a Multiple Advance Term Promissory Note, in the original principal
amount of $16.9&nbsp;million made by Natural Gas Services Group, Inc., bearing interest at a fixed rate
of 7.5% per annum and maturing on October&nbsp;1, 2011, and a Revolving Line of Credit Promissory Note,
in the original principal amount of $40 Million, made by Natural Gas Services Group, Inc., bearing
interest at a fixed rate of 7.5% per annum and maturing on October&nbsp;1, 2008.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The amounts available for borrowing under our Revolving Line of Credit Promissory Note are
subject to a borrowing base limitation equal to the lesser of: (a)&nbsp;the face amount of such Note and
(b)&nbsp;a borrowing base amount. The borrowing base amount is based on a percentage of the value of our
accounts receivable, lease receivables, equipment, work in process and inventory, less the
aggregate outstanding principal balances of our Revolving Line of Credit Note and Multiple Advance
Term Promissory Note. At the end of each month, we provide a borrowing base report to Western
National Bank setting forth our calculation of the borrowing base amount. The bank may, but is not
obligated to, re-determine the borrowing base in its sole discretion. If the bank does not
re-determine the borrowing base, the amount of the borrowing base set forth in the borrowing base
report furnished by us to the bank at the end of each month is deemed to be the re-determined
borrowing base, until the bank gives notice to us of a new borrowing base. At October&nbsp;26, 2006, the
borrowing base was $32.0&nbsp;million.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->24<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If the outstanding principal balance of our Revolving Line of Credit Promissory Note at any
time exceeds the then applicable borrowing base, we must, within fifteen business days after notice
from the bank, first prepay the principal amount outstanding under such Note in an aggregate amount
at least equal to such excess, together with accrued interest on the amount prepaid to the date of
such prepayment and, to the extent the excess is not eliminated by the prepayment of such Note, we
must next prepay the outstanding principal of our Multiple Advance Term Promissory Note, in an
amount equal to the remaining unpaid excess amount.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our obligations under the Loan Agreement continue to be collateralized by substantially all of
our assets, including our equipment, trade accounts receivable and other personal property, the
stock we own in SCS, and by the real estate and related plant facilities owned by SCS.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B><I>Subordinated Debt</I></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The principal amounts of the promissory notes issued to the three stockholders of SCS as
part of the consideration for the acquisition of SCS are in the aggregate principal amounts of $2.1
million, $600 thousand and $300 thousand. The principal of each note is payable in three equal
annual installments, which commenced on January&nbsp;3, 2006. Accrued and unpaid interest on the unpaid
principal balance of each note is payable on the same dates as, and in addition to, the
installments of principal. Under the terms of our Loan Agreement with our bank lender, we are
prohibited from making payments on these notes if at the time of any such payment we are then in
default under the Loan Agreement or if any such payment would cause or result in a default under
the Loan Agreement.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;To secure payment of these notes, our bank lender issued for our account three separate
letters of credit for the benefit of the holder of each respective note. The $2.1&nbsp;million
promissory note is secured by a letter of credit in the face amount of $1.4&nbsp;million; the $600
thousand promissory note is secured by a letter of credit in the face amount of $400 thousand; and
the $300 thousand promissory note is secured by a letter of credit in the face amount of $200
thousand.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The letters of credit expire February&nbsp;3, 2008. Drafts for payment under each beneficiary&#146;s
respective letter of credit may be made by the beneficiary only upon our default in payment of the
promissory note. If a draft for payment is not presented on or before February&nbsp;3, 2007, the face
amount of the letter of credit will automatically be reduced by one-half.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On January&nbsp;3, 2006, we paid the first installment of the annual payments in the amount of $1.0
million in principal.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Off-Balance Sheet Arrangements</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We do not participate in financial transactions that generate relationships with
unconsolidated entities or financial partnerships. Such entities often referred to as variable
interest entities or special purpose entities are generally established for the purpose of
facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. We
were not involved in any unconsolidated financial transactions with variable interest or special
purpose entities during any of the reporting periods in this report and have no intention to
participate in such transactions in the foreseeable future.
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Please refer to and read &#147;Special Note Regarding Forward-Looking Statements&#148; in our
Annual Report on Form 10-K for the fiscal year ended December&nbsp;31, 2005.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->25<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="106"></A>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURE ABOUT MARKET RISK</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Commodity Risk</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our commodity risk exposure is the pricing applicable to oil and natural gas production.
Realized commodity prices received for such production are primarily driven by the prevailing
worldwide price for crude oil and spot prices applicable to natural gas. Depending on the market
prices of oil and natural gas, companies exploring for oil and natural gas may cancel or curtail
their drilling programs, thereby reducing demand for our equipment and services.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Financial Instruments and Debt Maturities</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our financial instruments consist of cash and cash equivalents, short-term investments,
accounts receivable, accounts payable, bank borrowings, and notes. The carrying amounts of cash and
cash equivalents, accounts receivable and accounts payable approximate fair value due to the highly
liquid nature of these short-term instruments. The fair value of the bank borrowings approximate
the carrying amounts as of September&nbsp;30, 2006, and were determined based upon interest rates
currently available to us for borrowings with similar terms.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Customer Credit Risk</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are exposed to the risk of financial non-performance by customers. Our ability to
collect on sales to our customers is dependent on the liquidity of our customer base. To manage
customer credit risk, we monitor credit ratings of customers and seek to minimize exposure to any
one customer where other customers are readily available. Unless we are able to retain our existing
customers, or secure new customers if we lose one or more of our significant customers, our revenue
and results of operations would be adversely affected.
</DIV>
<DIV align="left">
<A name="107"></A>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;4. CONTROLS AND PROCEDURES</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>(a)</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Evaluation of Disclosure Controls and Procedures.</B></TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Under the supervision and with the participation of certain members of Natural Gas
Services Group, Inc&#146;s management, the chief executive officer and the vice-president of
accounting evaluated the effectiveness of the design and operation of the disclosure
controls and procedures (as defined in Rules&nbsp;13a-15(e) and 15d-15(e) of the Securities
Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;)) of Natural Gas Services Group,
Inc. as of the end of the period covered by this report. Based on this evaluation, the
chief executive officer and vice-president of accounting concluded that, as of the end
of the period covered by this report, Natural Gas Services Group, Inc&#146;s disclosure
controls and procedures were effective to ensure that information required to be
disclosed by Natural Gas Services Group, Inc. in the reports that it files under the
Exchange Act is collected, processed and disclosed within the time periods specified in
the Commission&#146;s rules and forms.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt"><!-- Folio -->26<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>(b)</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD><B>Changes in Internal Controls.</B></TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;There were no changes in Natural Gas Services Group, Inc&#146;s internal controls
during the period covered by this report that have materially affected or are
reasonably likely to materially affect Natural Gas Services Group, Inc&#146;s internal
controls over financial reporting. In addition, to the knowledge of the chief executive
officer and vice-president of accounting there were no changes in other factors that
could significantly affect these controls subsequent to the date of the most recent
evaluation made by the chief executive officer and the vice-president of accounting.</TD>
</TR>

</TABLE>
</DIV>
<DIV align="left">
<A name="108"></A>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>PART II &#150; OTHER INFORMATION</B>
</DIV>

<DIV align="left">
<A name="109"></A>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;1. Legal Proceedings</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are a party to one lawsuit arising in the ordinary course of our business. While
management is unable to predict the ultimate outcome of this action, management believes that any
ultimate liability arising from this action will not have a material adverse effect on our
consolidated financial position, results of operations or cash flow. Except as discussed herein,
we are not currently a party to any other legal proceedings and we are not aware of any other
threatened litigation.
</DIV>
<DIV align="left">
<A name="110"></A>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;1A. Risk Factors</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Please refer to and read &#147;Risk Factors&#148; in our Annual Report on Form 10-K for the fiscal
year ended December&nbsp;31, 2005, one of which has been updated as set forth below.
</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B><I>Our current debt level is high and may negatively impact our current and future financial
stability.</I></B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As of September&nbsp;30, 2006, we had an aggregate of approximately $19.3&nbsp;million of
outstanding indebtedness, not including outstanding letters of credit in the aggregate face amount
of $2.0&nbsp;million, and accounts payable and accrued expenses of approximately $7.0&nbsp;million. As a
result of our significant indebtedness, we might not have the ability to incur any substantial
additional indebtedness. The level of our indebtedness could have several important effects on our
future operations, including:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>our ability to obtain additional financing for working capital,
acquisitions, capital expenditures and other purposes may be limited;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>a significant portion of our cash flow from operations may be dedicated to
the payment of principal and interest on our debt, thereby reducing funds available
for other purposes; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD>our significant leverage could make us more vulnerable to economic
downturns.</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt"><!-- Folio -->27<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="111"></A>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>Item&nbsp;6. Exhibits</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The following exhibits are filed herewith or incorporated herein by reference, as
indicated:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">2.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Purchase and Sale Agreement by and between Hy-Bon Engineering
Company, Inc. and NGE Leasing, Inc.<SUP style="font-size: 85%; vertical-align: text-top"> </SUP> (Incorporated by
reference to Exhibit&nbsp;2.1 of the Registrant&#146;s Current Report on Form
8-K dated February 28, 2003 and filed with the Securities and
Exchange Commission on March&nbsp;6, 2003)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">3.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Articles of Incorporation, as amended (Incorporated by reference to
Exhibit&nbsp;3.1 of the Registrant&#146;s 10-QSB dated November&nbsp;10, 2004 and
filed with the Securities and Exchange Commission on November&nbsp;10,
2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">3.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Bylaws (Incorporated by reference to Exhibit&nbsp;3.4 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)<SUP style="font-size: 85%; vertical-align: text-top"> </SUP></DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant certificate (Incorporated by reference to Exhibit
4.1 of the Registrant&#146;s Registration Statement on Form&nbsp;SB-2, No.
333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant agent agreement (Incorporated by reference to
Exhibit&nbsp;4.2 of the Registrant&#146;s Registration Statement on Form&nbsp;SB-2,
No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.3</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of representative&#146;s option for the purchase of common stock
(Incorporated by reference to Exhibit 4.4 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)<SUP style="font-size: 85%; vertical-align: text-top"> </SUP></DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.4</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of representative&#146;s option for the purchase of warrants
(Incorporated by reference to Exhibit 4.5 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.5</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Stockholders Agreement, dated January&nbsp;3, 2005 among Paul D. Hensley,
Tony Vohjesus, Jim Hazlett and Natural Gas Services Group, Inc.
(Incorporated by reference to Exhibit&nbsp;4.3 of the Registrant&#146;s From
8-K Report, dated January&nbsp;3, 2005, as filed with the Securities and
Exchange Commission on January&nbsp;7, 2005)
Executive Compensation Plans and Arrangements (Exhibits 10.1, 10.23, 10.24, 10.25,
10.32, 10.33 and 10.35).</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">1998 Stock Option Plan, as amended (Incorporated by reference to
Exhibit&nbsp;10.1 of the Registrant&#146;s Form&nbsp;8-K Report dated June&nbsp;20, 2006
on file with the SEC June&nbsp;26, 2006)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Asset Purchase Agreement, dated January 1, 2001, between the
Registrant and Great Lakes Compression, Inc. (Incorporated by
reference to Exhibit&nbsp;10.2 of the Registrant&#146;s Registration Statement
on Form&nbsp;SB-2, No.&nbsp;333-88314)<SUP style="font-size: 85%; vertical-align: text-top"> </SUP></DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.3</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Exhibits 3(c)(1), 3(c)(2), 3(c)(3), 3(c)(4), 13(d)(1), 13(d)(2) and
13(d)(3) to Asset Purchase Agreement, dated January&nbsp;1, 2001, between
the Registrant and Great Lakes Compression, Inc. (Incorporated by
reference to Exhibit 10.14 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->28<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.4</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Amendment to Guaranty Agreement between Natural Gas Services Group,
Inc. and Dominion Michigan Production Services, Inc. (Incorporated
by reference to Exhibit 10.3 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)<SUP style="font-size: 85%; vertical-align: text-top"> </SUP></DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.5</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Series&nbsp;A 10% Subordinated Notes due December 31, 2006
(Incorporated by reference to Exhibit 10.8 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)<SUP style="font-size: 85%; vertical-align: text-top"> </SUP></DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.6</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Five-Year Warrants to Purchase Common Stock (Incorporated by
reference to Exhibit&nbsp;10.9 of the Registrant&#146;s Registration Statement
on Form&nbsp;SB-2, No.&nbsp;333-88314)<SUP style="font-size: 85%; vertical-align: text-top">
</SUP></DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.7</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Warrants issued to Berry-Shino Securities, Inc. (Incorporated by
reference to Exhibit 10.10 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)<SUP style="font-size: 85%; vertical-align: text-top"> </SUP></DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.8</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Warrants issued to Neidiger, Tucker, Bruner, Inc. (Incorporated by
reference to Exhibit 10.11 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.9</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant issued in March 2001 for guaranteeing debt
(Incorporated by reference to Exhibit 10.12 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.10</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant issued in April 2002 for guaranteeing debt
(Incorporated by reference to Exhibit 10.13 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.11</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Articles of Organization of Hy-Bon Rotary Compression, L.L.C., dated
April&nbsp;17, 2000 (Incorporated by reference to Exhibit 10.18 of the
Registrant&#146;s Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.12</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Regulations of Hy-Bon Rotary Compression, L.L.C. (Incorporated by
reference to Exhibit 10.19 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.13</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">First Amended and Restated Loan Agreement between the Registrant and
Western National Bank (Incorporated by reference to Exhibit&nbsp;10.1 of
the Registrant&#146;s Current Report on Form&nbsp;8-K, dated March&nbsp;27, 2003
and filed with the Securities and Exchange Commission on April&nbsp;14,
2003)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.14</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Termination of Employment Agreement Letter relating to the
Employment Agreement of Wayne Vinson (Incorporated by reference to
Exhibit&nbsp;10.26 of the Registrant&#146;s Annual Report on Form&nbsp;10-KSB for
the fiscal year ended December&nbsp;31, 2002)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.15</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Termination of Employment Agreement Letter relating to the
Employment Agreement of Earl Wait (Incorporated by reference to
Exhibit&nbsp;10.27 of the Registrant&#146;s Annual Report on Form&nbsp;10-KSB for
the fiscal year ended December&nbsp;31, 2002)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->29<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.16</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Triple Net Lease Agreement, dated June&nbsp;1, 2003, between NGE Leasing,
Inc. and Steven J. &#038; Katherina L. Winer (Incorporated by reference
to Exhibit 10.17 of the Registrant&#146;s Annual Report on Form&nbsp;10-KSB
for the fiscal year ended December&nbsp;31, 2003)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.17</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Lease Agreement, dated June&nbsp;19, 2003, between NGE Leasing, Inc. and
Wise Commercial Properties (Incorporated by reference to Exhibit
10.18 of the Registrant&#146;s Annual Report on Form 10-KSB for the
fiscal year ended December&nbsp;31, 2003)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.18</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Lease Agreement, dated March&nbsp;1, 2004, between the Registrant and the
City of Midland, Texas (Incorporated by reference to Exhibit&nbsp;10.19
of the Registrant&#146;s Form&nbsp;10-QSB for the fiscal quarter ended June
30, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.19</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Second Amended and Restated Loan Agreement, dated November&nbsp;3, 2003,
between the Registrant and Western National Bank (Incorporated by
reference to Exhibit&nbsp;10.20 of the Registrant&#146;s Form&nbsp;10-QSB for the
fiscal quarter ended June&nbsp;30, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.20</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Securities Purchase Agreement, dated July&nbsp;20, 2004, between the
Registrant and Cbarney Investments, Ltd. (Incorporated by reference
to Exhibit&nbsp;4.1 of the Registrant&#146;s Current Report on Form&nbsp;8-K dated
July&nbsp;20, 2004 and filed with the Securities and Exchange Commission
on July&nbsp;27, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.21</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Stock Purchase Agreement, dated October&nbsp;18, 2004, by and among the
Registrant, Screw Compression Systems, Inc., Paul D. Hensley, Jim
Hazlett and Tony Vohjesus (Incorporated by reference to Exhibit&nbsp;4.1
of the Registrant&#146;s Current Report on Form&nbsp;8-K dated October&nbsp;18,
2004 and filed with the Securities and Exchange Commission on
October&nbsp;21, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.22</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Third Amended and Restated Loan Agreement, dated as of January&nbsp;3,
2005, among Natural Gas Services Group, Inc., Screw Compression
Systems, Inc. and Western National Bank (Incorporated by reference
to Exhibit 10.1 of the Registrant&#146;s Current Report on Form&nbsp;8-K,
dated January&nbsp;3, 2005, and filed with the Securities and Exchange
Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.23</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between Paul D. Hensley and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.1 of
the Registrant&#146;s Form&nbsp;8-K Report, dated January&nbsp;3, 2005, as filed
with the Securities and Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.24</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between William R. Larkin and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.25 of
the Registrant&#146;s Form&nbsp;10-KSB for the fiscal year ended December&nbsp;31,
2004, and filed with the Securities and Exchange Commission on March
30, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.25</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Promissory Note, dated January&nbsp;3, 2005 in the original principal
amount of $2,100,000.00 made by Natural Gas Services Group, Inc.
payable to Paul D. Hensley (Incorporated by reference to Exhibit
10.26 of the Registrant&#146;s Form 10-KSB for the fiscal year ended
December 31, 2004, and filed with the Securities and Exchange
Commission on March&nbsp;30, 2005)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->30<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.26</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Fourth Amended and Restated Loan Agreement (Incorporated by
reference to Exhibit&nbsp;10.1 of the Registrant&#146;s Current Report on Form
8-K, dated March&nbsp;14, 2005, and filed with the Securities and
Exchange Commission on March&nbsp;18, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.27</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Modification Agreement, dated as of January&nbsp;3, 2005, by and between
Natural Gas Services Group, Inc. and Western National Bank
(Incorporated by reference to Exhibit 10.2 of the Registrant&#146;s
Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2005, and filed with
the Securities and Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.28</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Guaranty Agreement, dated as of January&nbsp;3, 2005, made by Natural Gas
Services Group, Inc., for the benefit of Western National Bank
(Incorporated by reference to Exhibit 10.3 of the Registrant&#146;s
Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2005, and filed with
the Securities and Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.29</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Guaranty Agreement, dated as of January 3, 2005, made by Screw
Compression Systems, Inc. for the benefit of Western National Bank
(Incorporated by reference to Exhibit 10.4 of the Registrant&#146;s
Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2005, and filed with
the Securities and Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.30</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Fifth Amended and Restated Loan Agreement (Incorporated by reference
to Exhibit&nbsp;10.2 of the Registrant&#146;s Form&nbsp;8-K dated January&nbsp;3, 2006
and filed with the Securities and Exchange Commission on January&nbsp;6,
2006)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.31</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">First Modification to Fourth Amended and Restated Loan Agreement
(Incorporated by reference to Exhibit&nbsp;10.1 of the Registrant&#146;s Form
8-K, dated May&nbsp;1, 2005 and filed with the Securities and Exchange
Commission on May&nbsp;13, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.32</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between Stephen C. Taylor and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.1 of
the Registrant&#146;s Form&nbsp;8-K Report, dated August&nbsp;24, 2005, and filed
with the Securities and Exchange Commission on August&nbsp;30, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.33</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between James R. Hazlett and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.1 of
the Registrant&#146;s Form&nbsp;8-K Report, dated June&nbsp;14, 2005, and filed
with the Securities and Exchange Commission on November&nbsp;14, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.34</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Stockholders Agreement, dated January&nbsp;3, 2005 among Paul D. Hensley,
Tony Vohjesus, Jim Hazlett and Natural Gas Services Group, Inc.
(Incorporated by reference to Exhibit&nbsp;4.3 of the Registrant&#146;s Form
8-K Report, dated January&nbsp;3, 2005, and filed with the Securities and
Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.35</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Promissory Note, dated January&nbsp;3, 2005, in the original principal
amount of $300,000 made by Natural Gas Services Group, Inc. payable
to Jim Hazlett (Incorporated by reference to Exhibit&nbsp;10.3 of the
Registrant&#146;s Form&nbsp;8-K Report, dated June&nbsp;14, 2005, and filed with
the Securities and Exchange Commission on November&nbsp;14, 2005)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->31<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.36</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Retirement Agreement, dated December&nbsp;14, 2005, between Wallace C.
Sparkman and Natural Gas Services Group, Inc. (Incorporated by
reference to Exhibit&nbsp;10.1 of the Registrant&#146;s Form&nbsp;8-K Report, dated
December 14, 2005, and filed with the Securities and Exchange
Commission on December&nbsp;15, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.37</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Sixth Amended and Restated Loan Agreement, dated as of January&nbsp;3,
2006 (Incorporated by reference to Exhibit&nbsp;10.3 of the Registrant&#146;s
Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2006, and filed with
the Securities and Exchange Commission on January&nbsp;6, 2006)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.38</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Guaranty Agreement, dated as of January&nbsp;3, 2006, and made by Screw
Compression Systems, Inc. for the benefit of Western National Bank
(Incorporated by reference to Exhibit 10.4 of the Registrant&#146;s
Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2006, and filed with
the Securities and Exchange Commission on January&nbsp;6, 2006)</DIV></TD>
</TR>




<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.39</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Seventh
Amended and Restated Loan Agreement (Incorporated by reference to
Exhibit 10.1 of the Registrant&#146;s Form 8-K dated October 26, 2006
and filed with the Securities and Exchange Commission on
November&nbsp;1, 2006</DIV></TD>
</TR>



<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">14.0</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Code of Ethics (Incorporated by reference to Exhibit&nbsp;14.0 of the
Registrant&#146;s Form 10-KSB for the fiscal year ended December 31,
2004, and filed with the Securities and Exchange Commission on March
30, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">21.0</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Subsidiaries (Incorporated by reference to Exhibit 21.0 of the
Registrant&#146;s Form&nbsp;10-KSB for the fiscal year ended December&nbsp;31, 2004
and filed with the Securities and Exchange Commission on March&nbsp;30,
2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*31.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification of Chief Executive Officer required by Section&nbsp;302 of
the Sarbanes-Oxley Act of 2002</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*31.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification of Chief Financial Officer required by Section&nbsp;302 of
the Sarbanes-Oxley Act of 2002</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*32.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification required by Section&nbsp;906 of the Sarbanes-Oxley Act of
2002</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*32.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification required by Section&nbsp;906 of the Sarbanes-Oxley Act of
2002</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Filed herewith</TD>
</TR>

</TABLE>


<P align="center" style="font-size: 10pt"><!-- Folio -->32<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="112"></A>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<B>SIGNATURES</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has
duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="60%">&nbsp;</TD>
</TR>
<TR>
    <TD colspan="3" align="left">NATURAL GAS SERVICES GROUP, INC.<BR>
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Stephen C. Taylor
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Stephen C. Taylor&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left" nowrap>President and Chief Executive Officer</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="30%">&nbsp;</TD>
    <TD width="60%">&nbsp;</TD>
</TR>
<TR>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD valign="top">By:&nbsp;&nbsp;</TD>
    <TD colspan="2" style="border-bottom: 1px solid #000000" align="left">/s/ Earl R. Wait
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left">Earl R. Wait&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD>&nbsp;</TD>
    <TD colspan="2" align="left" nowrap>Principal Accounting Officer And Treasurer</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt">November&nbsp;9, 2006
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->33<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>
<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="left">
<A name="113"></A>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>INDEX TO EXHIBITS:</B>

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">2.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Purchase and Sale Agreement by and between Hy-Bon Engineering
Company, Inc. and NGE Leasing, Inc. (Incorporated by reference to
Exhibit&nbsp;2.1 of the Registrant&#146;s Current Report on Form&nbsp;8-K dated
February 28, 2003 and filed with the Securities and Exchange
Commission on March&nbsp;6, 2003)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">3.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Articles of Incorporation, as amended (Incorporated by reference
to Exhibit&nbsp;3.1 of the 10QSB filed and dated November&nbsp;10, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">3.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Bylaws (Incorporated by reference to Exhibit 3.4 of the
Registrant&#146;s Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant certificate (Incorporated by reference to Exhibit
4.1 of the Registrant&#146;s Registration Statement on Form&nbsp;SB-2, No.
333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant agent agreement (Incorporated by reference to
Exhibit&nbsp;4.2 of the Registrant&#146;s Registration Statement on Form
SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.3</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of representative&#146;s option for the purchase of common stock
(Incorporated by reference to Exhibit&nbsp;4.4 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.4</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of representative&#146;s option for the purchase of warrants
(Incorporated by reference to Exhibit&nbsp;4.5 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">4.5</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Stockholders Agreement, dated January 3, 2005 among Paul D.
Hensley, Tony Vohjesus, Jim Hazlett and Natural Gas Services
Group, Inc. (Incorporated by reference to Exhibit&nbsp;4.3 of the
Registrant&#146;s From 8-K Report, dated January&nbsp;3, 2005, as filed
with the Securities and Exchange Commission on January&nbsp;7, 2005)
Executive Compensation Plans and Arrangements (Exhibits 10.1,
10.23, 10.24, 10.25, 10.32, 10.33 and 10.35).</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">1998 Stock Option Plan, as amended (Incorporated by reference to
Exhibit&nbsp;10.1 of the Registrant&#146;s Form&nbsp;8-K Report dated June&nbsp;20,
2006 on file with the SEC June&nbsp;26, 2006)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Asset Purchase Agreement, dated January&nbsp;1, 2001, between the
Registrant and Great Lakes Compression, Inc. (Incorporated by
reference to Exhibit 10.2 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.3</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Exhibits 3(c)(1), 3(c)(2), 3(c)(3), 3(c)(4), 13(d)(1), 13(d)(2)
and 13(d)(3) to Asset Purchase Agreement, dated January&nbsp;1, 2001,
between the Registrant and Great Lakes Compression, Inc.
(Incorporated by reference to Exhibit&nbsp;10.14 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.4</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Amendment to Guaranty Agreement between Natural Gas Services
Group, Inc. and Dominion Michigan Production Services, Inc.
(Incorporated by reference to Exhibit&nbsp;10.3 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->34<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.5</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Series&nbsp;A 10% Subordinated Notes due December 31, 2006
(Incorporated by reference to Exhibit&nbsp;10.8 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.6</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Five-Year Warrants to Purchase Common Stock (Incorporated
by reference to Exhibit 10.9 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.7</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Warrants issued to Berry-Shino Securities, Inc. (Incorporated by
reference to Exhibit 10.10 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.8</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Warrants issued to Neidiger, Tucker, Bruner, Inc. (Incorporated
by reference to Exhibit 10.11 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.9</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant issued in March 2001 for guaranteeing debt
(Incorporated by reference to Exhibit&nbsp;10.12 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.10</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of warrant issued in April 2002 for guaranteeing debt
(Incorporated by reference to Exhibit&nbsp;10.13 of the Registrant&#146;s
Registration Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.11</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Articles of Organization of Hy-Bon Rotary Compression, L.L.C.,
dated April&nbsp;17, 2000 (Incorporated by reference to Exhibit&nbsp;10.18
of the Registrant&#146;s Registration Statement on Form&nbsp;SB-2, No.
333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.12</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Regulations of Hy-Bon Rotary Compression, L.L.C. (Incorporated by
reference to Exhibit 10.19 of the Registrant&#146;s Registration
Statement on Form&nbsp;SB-2, No.&nbsp;333-88314)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.13</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">First Amended and Restated Loan Agreement between the Registrant
and Western National Bank (Incorporated by reference to Exhibit
10.1 of the Registrant&#146;s Current Report on Form&nbsp;8-K, dated March
27, 2003 and filed with the Securities and Exchange Commission on
April&nbsp;14, 2003)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.14</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Termination of Employment Agreement Letter relating to
the Employment Agreement of Wayne Vinson (Incorporated by
reference to Exhibit&nbsp;10.26 of the Registrant&#146;s Annual Report on
Form&nbsp;10-KSB for the fiscal year ended December&nbsp;31, 2002)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.15</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Form of Termination of Employment Agreement Letter relating to
the Employment Agreement of Earl Wait (Incorporated by reference
to Exhibit&nbsp;10.27 of the Registrant&#146;s Annual Report on Form&nbsp;10-KSB
for the fiscal year ended December&nbsp;31, 2002)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.16</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Triple Net Lease Agreement, dated June&nbsp;1, 2003, between NGE
Leasing, Inc. and Steven J. &#038; Katherina L. Winer (Incorporated by
reference to Exhibit&nbsp;10.17 of the Registrant&#146;s Annual Report on
Form&nbsp;10-KSB for the fiscal year ended December&nbsp;31, 2003)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->35<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.17</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Lease Agreement, dated June&nbsp;19, 2003, between NGE Leasing, Inc.
and Wise Commercial Properties (Incorporated by reference to
Exhibit 10.18 of the Registrant&#146;s Annual Report on Form&nbsp;10-KSB
for the fiscal year ended December&nbsp;31, 2003)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.18</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Lease Agreement, dated March&nbsp;1, 2004, between the Registrant and
the City of Midland, Texas (Incorporated by reference to Exhibit
10.19 of the Registrant&#146;s Form 10-QSB for the fiscal quarter
ended June&nbsp;30, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.19</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Second Amended and Restated Loan Agreement, dated November&nbsp;3,
2003, between the Registrant and Western National Bank
(Incorporated by reference to Exhibit&nbsp;10.20 of the Registrant&#146;s
Form&nbsp;10-QSB for the fiscal quarter ended June&nbsp;30, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.20</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Securities Purchase Agreement, dated July&nbsp;20, 2004, between the
Registrant and CBarney Investments, Ltd. (Incorporated by
reference to Exhibit&nbsp;4.1 of the Registrant&#146;s Current Report on
Form&nbsp;8-K dated July&nbsp;20, 2004 and filed with the Securities and
Exchange Commission on July&nbsp;27, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.21</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Stock Purchase Agreement, dated October&nbsp;18, 2004, by and among
the Registrant, Screw Compression Systems, Inc., Paul D. Hensley,
Jim Hazlett and Tony Vohjesus (Incorporated by reference to
Exhibit&nbsp;4.1 of the Registrant&#146;s Current Report on Form&nbsp;8-K dated
October 18, 2004 and filed with the Securities and Exchange
Commission on October&nbsp;21, 2004)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.22</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Third Amended and Restated Loan Agreement, dated as of January&nbsp;3,
2005, among Natural Gas Services Group, Inc., Screw Compression
Systems, Inc. and Western National Bank (Incorporated by
reference to Exhibit&nbsp;10.1 of the Registrant&#146;s Current Report on
Form&nbsp;8-K, dated January&nbsp;3, 2005, and filed with the Securities
and Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.23</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between Paul D. Hensley and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.1
of the Registrants Form&nbsp;8-K Report, dated January&nbsp;3, 2005, as
filed with the Securities and Exchange Commission on January&nbsp;7,
2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.24</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between William R. Larkin and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.25
of the Registrant&#146;s Form 10-KSB for the fiscal year ended
December&nbsp;31, 2004, and filed with the Securities and Exchange
Commission on March&nbsp;30, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.25</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Promissory Note, dated January&nbsp;3, 2005, in the original principal
amount of $2,100,000.00 made by Natural Gas Services Group, Inc.
payable to Paul D. Hensley (Incorporated by reference to Exhibit
10.26 of the Registrant&#146;s Form&nbsp;10-KSB for the fiscal year ended
December&nbsp;31, 2004, and filed with the Securities and Exchange
Commission on March&nbsp;30, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.26</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Fourth Amended and Restated Loan Agreement (Incorporated by
reference to Exhibit&nbsp;10.1 of the Registrant&#146;s Current Report on
Form&nbsp;8-K, dated March&nbsp;14, 2005, and filed with the Securities and
Exchange Commission on March&nbsp;18, 2005)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->36<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.27</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Modification Agreement, dated as of January 3, 2005, by and
between Natural Gas Services Group, Inc. and Western National
Bank (Incorporated by reference to Exhibit 10.2 of the
Registrant&#146;s Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2005,
and filed with the Securities and Exchange Commission on January
7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.28</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Guaranty Agreement, dated as of January&nbsp;3, 2005, mad by Natural
Gas Service Group, Inc., for the benefit of Western National Bank
(Incorporated by reference to Exhibit&nbsp;10.3 of the Registrant&#146;s
Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2005, and filed with
the Securities and Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.29</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Guaranty Agreement, dated as of January 3, 2005, mad by Screw
Compression Systems, Inc., for the benefit of Western National
Bank (Incorporated by reference to Exhibit 10.4 of the
Registrant&#146;s Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2005,
and filed with the Securities and Exchange Commission on January
7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.30</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Fifth Amended and Restated Loan Agreement (Incorporated by
reference to Exhibit 10.2 of the Registrant&#146;s Form&nbsp;8-K dated
January 3, 2006 and filed with the Securities and Exchange
Commission January&nbsp;6, 2006)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.31</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">First Modification to Fourth Amended and Restated Loan Agreement
(Incorporated by reference Exhibit&nbsp;10.1 of the Registrant&#146;s Form
8-K dated May&nbsp;1, 2005 and filed with Securities and Exchange
Commission May&nbsp;13, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.32</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between Stephen C. Taylor and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.1
of the Registrant&#146;s Form&nbsp;8-K Report, dated August&nbsp;24, 2005, and
filed with the Securities and Exchange Commission on August&nbsp;30,
2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.33</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Employment Agreement between James R. Hazlett and Natural Gas
Services Group, Inc. (Incorporated by reference to Exhibit&nbsp;10.1
of the Registrant&#146;s Form&nbsp;8-K Report, dated June&nbsp;14, 2005, and
filed with the Securities and Exchange Commission on November&nbsp;14,
2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.34</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Stockholders Agreement, dated January 3, 2005 among Paul D.
Hensley, Tony Vohjesus, Jim Hazlett and Natural Gas Services
Group, Inc. (Incorporated by reference to Exhibit&nbsp;4.3 of the
Registrant&#146;s Form&nbsp;8-K Report, dated January&nbsp;3, 2005, and filed
with the Securities and Exchange Commission on January&nbsp;7, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.35</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Promissory Note, dated January&nbsp;3, 2005, in the original principal
amount of $300,000 made by Natural Gas Services Group, Inc.
payable to Jim Hazlett (Incorporated by reference to Exhibit&nbsp;10.3
of the Registrant&#146;s Form&nbsp;8-K Report, dated June&nbsp;14, 2005, and
filed with the Securities and Exchange Commission on November&nbsp;14,
2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.36</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Retirement Agreement, dated December&nbsp;14, 2005, between Wallace C.
Sparkman and Natural Gas Services Group, Inc. (Incorporated by
reference to Exhibit&nbsp;10.1 of the Registrant&#146;s Form&nbsp;8-K Report,
dated December 14, 2005, and filed with the Securities and
Exchange Commission on December&nbsp;15, 2005)</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->37<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always"><A HREF="#tocpage">Table of Contents</A></H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center" colspan="3" style="border-bottom: 1px solid #000000">Exhibit No.</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000">Description</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.37</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Sixth Amended and Restated Loan Agreement, dated as of January&nbsp;3,
2006 (Incorporated by reference to Exhibit 10.3 of the
Registrant&#146;s Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2006,
and filed with the Securities and Exchange Commission on January
6, 2006)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.38</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Guaranty Agreement, dated as of January 3, 2006, and made by
Screw Compression Systems, Inc. for the benefit of Western
National Bank (Incorporated by reference to Exhibit&nbsp;10.4 of the
Registrant&#146;s Current Report on Form&nbsp;8-K, dated January&nbsp;3, 2006,
and filed with the Securities and Exchange Commission on January
6, 2006)</DIV></TD>
</TR>




<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">10.39</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>

<TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Seventh
Amended and Restated Loan Agreement (Incorporated by reference to
Exhibit 10.1 of the Registrant&#146;s Form 8-K dated October 26, 2006
and filed with the Securities and Exchange Commission on
November&nbsp;1, 2006</DIV></TD>
</TR>



<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">14.0</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Code of Ethics (Incorporated by reference to Exhibit&nbsp;14.0 of the
Registrant&#146;s Form&nbsp;10-KSB for the fiscal year ended December&nbsp;31,
2004, and filed with the Securities and Exchange Commission on
March&nbsp;30, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">21.0</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Subsidiaries (Incorporated by reference to Exhibit&nbsp;21.0 of the
Registrant&#146;s Form&nbsp;10-KSB for the fiscal year ended December&nbsp;31,
2004, and filed with the Securities and Exchange Commission on
March&nbsp;30, 2005)</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*31.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification of Chief Executive Officer required by Section&nbsp;302
of the Sarbanes-Oxley Act of 2002</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*31.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification of Chief Financial Officer required by Section&nbsp;302
of the Sarbanes-Oxley Act of 2002</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*32.1</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification required by Section&nbsp;906 of the Sarbanes-Oxley Act
of 2002</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
</TR>
<TR valign="bottom">
    <TD nowrap align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">*32.2</TD>
    <TD nowrap valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Certification required by Section&nbsp;906 of the Sarbanes-Oxley Act
of 2002</DIV></TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Filed herewith.</TD>
</TR>

</TABLE>




<P align="center" style="font-size: 10pt"><!-- Folio -->38<!-- /Folio -->
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.1
<SEQUENCE>2
<FILENAME>d41123exv31w1.htm
<DESCRIPTION>CERTIFICATION OF CEO PURSUANT TO SECTION 302
<TEXT>
<HTML>
<HEAD>
<TITLE>exv31w1</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">






<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">EXHIBIT 31.1

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>Certification of Principal Executive Officer Under<BR>
Section&nbsp;302 of the Sarbanes-Oxley Act of 2002</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I, Stephen C. Taylor, Chief Executive Officer of Natural Gas Services Group, Inc., certify
that:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">1.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>I have reviewed this Quarterly Report on Form 10-Q of Natural Gas Services Group,
Inc.;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">2.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading with
respect to the period covered by this report;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">3.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Based on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial condition,
results of operations and cash flows of the registrant as of, and for, the periods
presented in this report;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">4.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The registrant&#146;s other certifying officer(s) and I are responsible for establishing
and maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) for the registrant and have:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Designed such disclosure controls and procedures, or caused
such disclosure controls and procedures to be designed under our supervision,
to ensure that material information relating to the registrant, including its
consolidated subsidiaries, is made known to us by others within those
entities, particularly during the period in which this report is being
prepared;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Omitted;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Evaluated the effectiveness of the registrant&#146;s disclosure
controls and procedures and presented in this report our conclusions about the
effectiveness of the disclosure controls and procedures, as of the end of the
period covered by this report based on such evaluation; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Disclosed in this report any change in the registrant&#146;s
internal control over financial reporting that occurred during the
registrant&#146;s most recent fiscal quarter (the registrant&#146;s fourth fiscal
quarter in the case of an annual report) that has materially affected, or is
reasonably likely to materially affect, the registrant&#146;s internal control over
financial reporting; and</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">5.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The registrant&#146;s other certifying officer(s) and I have disclosed, based on our most
recent evaluation of internal control over financial reporting, to the registrant&#146;s
auditors and the audit committee of the registrant&#146;s board of directors (or persons
performing the equivalent functions):</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>All significant deficiencies and material weaknesses in the
design of operation of internal control over financial reporting which are
reasonably likely to adversely effect the registrant&#146;s ability to record,
process, summarize and report financial information; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Any fraud, whether or not material, that involves management
or other employees who have a significant role in the registrant&#146;s internal
control over financial reporting.</TD>
</TR>

</TABLE>
</DIV>
<DIV align="left">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="40%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="7%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="90%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Date:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Signature:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Stephen C. Taylor</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Stephen C. Taylor</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Title:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Chief Executive
Officer<BR><BR>November&nbsp;9, 2006</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-31.2
<SEQUENCE>3
<FILENAME>d41123exv31w2.htm
<DESCRIPTION>CERTIFICATION OF CFO PURSUANT TO SECTION 302
<TEXT>
<HTML>
<HEAD>
<TITLE>exv31w2</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">EXHIBIT 31.2

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>Certification of Principal Financial Officer Under<BR>
Section&nbsp;302 of the Sarbanes-Oxley Act of 2002</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;I, Earl R. Wait, Principal Accounting Officer of Natural Gas Services Group, Inc.,
certify that:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">1.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>I have reviewed this Quarterly Report on Form 10-Q of Natural Gas Services Group,
Inc.;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">2.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Based on my knowledge, this report does not contain any untrue statement of a
material fact or omit to state a material fact necessary to make the statements made, in
light of the circumstances under which such statements were made, not misleading with
respect to the period covered by this report;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">3.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Based on my knowledge, the financial statements, and other financial information
included in this report, fairly present in all material respects the financial condition,
results of operations and cash flows of the small business issuer as of, and for, the
periods presented in this report;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">4.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The registrant&#146;s other certifying officer(s) and I are responsible for establishing
and maintaining disclosure controls and procedures (as defined in Exchange Act Rules
13a-15(e) and 15d-15(e)) for the registrant and have:</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Designed such disclosure controls and
procedures, or caused such disclosure controls and procedures to be
designed under our supervision, to ensure that material information
relating to the registrant, including its consolidated subsidiaries,
is made known to us by others within those entities, particularly
during the period in which this report is being prepared;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Omitted;</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(c)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Evaluated the effectiveness of the
registrant&#146;s disclosure controls and procedures and presented in this
report our conclusions about the effectiveness of the disclosure
controls and procedures, as of the end of the period covered by this
report based on such evaluation; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(d)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Disclosed in this report any change in the
registrant&#146;s internal control over financial reporting that occurred
during the registrant&#146;s most recent fiscal quarter (the registrant&#146;s
fourth fiscal quarter in the case of an annual report) that has
materially affected, or is reasonably likely to materially affect, the
registrant&#146;s internal control over financial reporting; and</TD>
</TR>

</TABLE>
</DIV>
<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="margin-top: 6pt"><TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">



</TABLE>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">5.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The registrant&#146;s other certifying officer(s) and I have disclosed, based on our most
recent evaluation of internal control over financial reporting, to the registrant&#146;s
auditors and the audit committee of the registrant&#146;s board of directors (or persons
performing the equivalent functions):</TD>
</TR>

</TABLE>
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(a)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>All significant deficiencies and material weaknesses in the
design of operation of internal control over financial reporting which are
reasonably likely to adversely effect the registrant&#146;s ability to record,
process, summarize and report financial information; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="6%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">(b)</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>Any fraud, whether or not material, that involves management
or other employees who have a significant role in the registrant&#146;s internal
control over financial reporting.</TD>
</TR>

</TABLE>
</DIV>
<DIV align="left">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="40%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="7%">&nbsp;</TD>
    <TD width="2%">&nbsp;</TD>
    <TD width="90%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Date:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">November&nbsp;9, 2006</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Signature:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Earl R. Wait</TD>
</TR>
<TR style="font-size: 1px">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Earl R. Wait</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Title:
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Principal Accounting Officer</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.1
<SEQUENCE>4
<FILENAME>d41123exv32w1.htm
<DESCRIPTION>CERTIFICATION REQUIRED BY SECTION 906
<TEXT>
<HTML>
<HEAD>
<TITLE>exv32w1</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">EXHIBIT 32.1

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>CERTIFICATION PURSUANT TO<BR>
18 U.S.C. &#167;1350,<BR>
AS ADOPTED PURSUANT TO<BR>
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002</B>

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In connection with the Quarterly Report of Natural Gas Services Group, Inc. (the
&#147;Company&#148;) on Form 10-Q for the period ended September&nbsp;30, 2006 as filed with the Securities and
Exchange Commission on the date hereof (the &#147;Report&#148;), I, Stephen C. Taylor, Chief Executive
Officer of the Company, certify, pursuant to 18 U.S.C. &#167;1350, as adopted pursuant to Section&nbsp;906 of
the Sarbanes-Oxley Act of 2002, that:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">1.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Report fully complies with the requirements of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">2.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The information contained in the Report fairly presents, in all material respects,
the financial condition and results of operations of the Company.</TD>
</TR>

</TABLE>
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" style="border-bottom: 1px solid #000000" align="left">                               /s/ Stephen C. Taylor
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Stephen C. Taylor&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Chief Executive
Officer<BR><BR>November 9, 2006&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>

</TABLE>

<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
<DOCUMENT>
<TYPE>EX-32.2
<SEQUENCE>5
<FILENAME>d41123exv32w2.htm
<DESCRIPTION>CERTIFICATION REQUIRED BY SECTION 906
<TEXT>
<HTML>
<HEAD>
<TITLE>exv32w2</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
<!-- PAGEBREAK -->
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>

</TABLE>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>NATURAL GAS SERVICES GROUP, INC.</B>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">EXHIBIT 32.2

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><B>CERTIFICATION PURSUANT TO<BR>
18 U.S.C. &#167;1350,<BR>
AS ADOPTED PURSUANT TO<BR>
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002</B>

</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In connection with the Quarterly Report of Natural Gas Services Group, Inc. (the
&#147;Company&#148;) on Form 10-Q for the period ended September&nbsp;30, 2006, as filed with the Securities and
Exchange Commission on the date hereof (the &#147;Report&#148;), I, Earl R. Wait, Chief Financial Officer of
the Company, certify, pursuant to 18 U.S.C. &#167;1350, as adopted pursuant to Section&nbsp;906 of the
Sarbanes-Oxley Act of 2002, that:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">1.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The Report fully complies with the requirements of Section 13(a) or 15(d) of the
Securities Exchange Act of 1934; and</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="2%" style="background: transparent">&nbsp;</TD>
    <TD width="2%" nowrap align="left">2.</TD>
    <TD width="1%">&nbsp;</TD>
    <TD>The information contained in the Report fairly presents, in all material respects,
the financial condition and results of operations of the Company.</TD>
</TR>

</TABLE>
</DIV>

<TABLE width="100%" border="0" cellspacing="0" cellpadding="0" style="font-size: 10pt">
<TR>
    <TD width="48%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="15%">&nbsp;</TD>
</TR>
<TR>
    <TD valign="top" align="left">&nbsp;</TD>
    <TD colspan="3" align="left">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" style="border-bottom: 1px solid #000000" align="left">                                        /s/ Earl R. Wait
&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Earl R. Wait&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR><TR>
    <TD align="left">&nbsp;</TD>
    <TD colspan="3" align="left">Principal Accounting
Officer<BR><BR>November 9, 2006&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR>
    <TD colspan="5">&nbsp;</TD>
</TR>
</TABLE>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
