<SEC-DOCUMENT>0001193125-18-145395-index.html : 20180501
<SEC-HEADER>0001193125-18-145395.hdr.sgml : 20180501
<ACCEPTANCE-DATETIME>20180501095203
ACCESSION NUMBER:		0001193125-18-145395
CONFORMED SUBMISSION TYPE:	DEFA14A
PUBLIC DOCUMENT COUNT:		5
FILED AS OF DATE:		20180501
DATE AS OF CHANGE:		20180501
EFFECTIVENESS DATE:		20180501

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
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		DEFA14A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-31398
		FILM NUMBER:		18793595

	BUSINESS ADDRESS:	
		STREET 1:		508 WEST WALL STREET
		STREET 2:		SUITE 550
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79701
		BUSINESS PHONE:		432-262-2700

	MAIL ADDRESS:	
		STREET 1:		508 WEST WALL STREET
		STREET 2:		SUITE 550
		CITY:			MIDLAND
		STATE:			TX
		ZIP:			79701
</SEC-HEADER>
<DOCUMENT>
<TYPE>DEFA14A
<SEQUENCE>1
<FILENAME>d554341ddefa14a.htm
<DESCRIPTION>DEFA14A
<TEXT>
Document 1 - file: d554341ddefa14a.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g554341img01.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g554341img01.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g554341img02.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g554341img02.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g554341img03.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g554341img03.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g554341img04.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g554341img04.jpg

</DOCUMENT>
</SEC-DOCUMENT>