<SEC-DOCUMENT>0001193125-21-216458.txt : 20210715
<SEC-HEADER>0001193125-21-216458.hdr.sgml : 20210715
<ACCEPTANCE-DATETIME>20210715164157
ACCESSION NUMBER:		0001193125-21-216458
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20210715
DATE AS OF CHANGE:		20210715

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PIONEER ENERGY SERVICES CORP
		CENTRAL INDEX KEY:			0000320575
		STANDARD INDUSTRIAL CLASSIFICATION:	DRILLING OIL & GAS WELLS [1381]
		IRS NUMBER:				742088619
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-33018
		FILM NUMBER:		211093087

	BUSINESS ADDRESS:	
		STREET 1:		1250 N.E. LOOP 410
		STREET 2:		SUITE 1000
		CITY:			SAN ANTONIO
		STATE:			TX
		ZIP:			78209
		BUSINESS PHONE:		855-884-0575

	MAIL ADDRESS:	
		STREET 1:		1250 N.E. LOOP 410
		STREET 2:		SUITE 1000
		CITY:			SAN ANTONIO
		STATE:			TX
		ZIP:			78209

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PIONEER DRILLING CO
		DATE OF NAME CHANGE:	20011102

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SOUTH TEXAS DRILLING & EXPLORATION INC
		DATE OF NAME CHANGE:	19920703

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	SOUTH TEXAS DRILLING CO
		DATE OF NAME CHANGE:	19810715

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PATTERSON UTI ENERGY INC
		CENTRAL INDEX KEY:			0000889900
		STANDARD INDUSTRIAL CLASSIFICATION:	DRILLING OIL & GAS WELLS [1381]
		IRS NUMBER:				752504748
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D

	BUSINESS ADDRESS:	
		STREET 1:		10713 WEST SAM HOUSTON PARKWAY NORTH
		STREET 2:		SUITE 800
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77064
		BUSINESS PHONE:		2817657100

	MAIL ADDRESS:	
		STREET 1:		10713 WEST SAM HOUSTON PARKWAY NORTH
		STREET 2:		SUITE 800
		CITY:			HOUSTON
		STATE:			TX
		ZIP:			77064

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	PATTERSON ENERGY INC
		DATE OF NAME CHANGE:	19940228
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>d180044dsc13d.htm
<DESCRIPTION>SC 13D
<TEXT>
<HTML><HEAD>
<TITLE>SC 13D</TITLE>
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<Center><DIV STYLE="width:8.5in" align="left">
 <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P> <P STYLE="margin-top:4pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>UNITED STATES </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SECURITIES AND EXCHANGE COMMISSION </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Washington, D.C. 20549 </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:18pt; font-family:Times New Roman" ALIGN="center"><B>SCHEDULE 13D
</B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>Under the Securities Exchange Act of 1934 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:12pt; font-family:Times New Roman" ALIGN="center"><B>(Amendment No. N/A)* </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:22pt; font-family:Times New Roman" ALIGN="center"><B>Pioneer
Energy Services Corp. </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(Name of Issuer) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Common Stock, $0.001 par value </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Title of Class&nbsp;of Securities) </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>723664207 </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(CUSIP Number)
</B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Seth D. Wexler </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Senior Vice President, General Counsel and Secretary </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B><FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Energy, Inc. </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>10713 W. Sam Houston Pkwy N, Suite 800 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Houston, TX 77064 </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B><I>with a copy to: </I></B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Tull R. Florey </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Gibson,
Dunn&nbsp;&amp; Crutcher LLP </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>811 Main Street, Suite 3000 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>Houston, TX 77002 </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>(346) <FONT
STYLE="white-space:nowrap">718-6600</FONT> </B></P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Name, Address and Telephone Number of Person Authorized to Receive Notices and
Communications) </B></P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>July&nbsp;5, 2021 </B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>(Date of Event which Requires Filing of this Statement) </B></P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P><center>
<P STYLE="line-height:6.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1.00pt solid #000000;width:21%">&nbsp;</P></center> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">If the filing person has
previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of &#167;&#167; <FONT STYLE="white-space:nowrap">240.13d-1(e),</FONT>
<FONT STYLE="white-space:nowrap">240.13d-1(f)</FONT> or <FONT STYLE="white-space:nowrap">240.13d-1(g),</FONT> check the following box.&nbsp;&nbsp;&#9744; </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">*</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">The remainder of this cover page shall be filled out for a reporting person&#146;s initial filing on this form
with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. </P></TD></TR></TABLE>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The information required in the remainder of this cover page shall not be deemed to be &#147;filed&#148; for the purpose of Section&nbsp;18 of the Securities
Exchange Act of 1934 (the &#147;Exchange Act&#148;) or otherwise subject to the liabilities of that section of the Exchange Act, but shall be subject to all other provisions of the Exchange Act (however, see the Notes). </P>
<P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="line-height:1.0pt;margin-top:0pt;margin-bottom:0pt;border-bottom:1px solid #000000">&nbsp;</P>
<P STYLE="line-height:3.0pt;margin-top:0pt;margin-bottom:2pt;border-bottom:1px solid #000000">&nbsp;</P>
</DIV></Center>


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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">CUSIP NO. 723664207 </P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">&nbsp;&nbsp;1&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-TOP:1px solid #000000; BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt">
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Name of Reporting Person</P> <P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Patterson-UTI Energy, Inc.</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">&nbsp;&nbsp;2</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Check the Appropriate Box
if a Member of a Group</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;(a):&nbsp;&nbsp;&#9744;&nbsp;&nbsp;&nbsp;&nbsp;(b):&nbsp;&nbsp;&#9744;</P>
<P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:1pt">&nbsp;</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">&nbsp;&nbsp;3</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;SEC Use Only</P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:1pt">&nbsp;</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">&nbsp;&nbsp;4</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Source of Funds (See
Instructions)</P> <P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;OO (See Item 3)</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">&nbsp;&nbsp;5</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Check Box if Disclosure of
Legal Proceedings Is Required Pursuant to Items 2(d) or 2(e):</P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;&#9744;</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">&nbsp;&nbsp;6</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Citizenship or Place of
Organization</P> <P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Delaware</P></TD></TR></TABLE>
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<TD WIDTH="2%"></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="6%"></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="3%"></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="86%"></TD></TR>

<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="middle" COLSPAN="3" ROWSPAN="4" STYLE="BORDER-LEFT:1px solid #000000; padding-left:8pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Number&nbsp;of</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Shares</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">&nbsp;Beneficially&nbsp;</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Owned&nbsp;by</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Each</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Reporting</P> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">Person</P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center">with</P> <P STYLE="font-size:10pt;margin-top:0pt;margin-bottom:1pt" align="left">&nbsp;</P></TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;7&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Sole Voting Power</P>
<P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;0</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;8</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Shared Voting Power</P>
<P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;10,588,642(1)(2)</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;9</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Sole Dispositive Power</P>
<P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;0</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top">10</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000">&nbsp;&nbsp;</TD>
<TD VALIGN="top" STYLE="BORDER-RIGHT:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Shared Dispositive Power</P>
<P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;0</P></TD></TR></TABLE>
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<TR>

<TD WIDTH="3%"></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="6%"></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="88%"></TD></TR>

<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">11&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-TOP:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-TOP:1px solid #000000; BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt">
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Aggregate Amount Beneficially Owned by Each Reporting Person</P> <P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;10,588,642(1)(2)</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">12</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Check if the Aggregate
Amount in Row (11) Excludes Certain Shares</P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;&#9744;</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">13</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Percent of Class
Represented by Amount in Row (11)</P> <P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;90.5%(3)</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top" STYLE="BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-left:8pt">14</TD>
<TD VALIGN="bottom" STYLE=" BORDER-LEFT:1px solid #000000; BORDER-BOTTOM:1px solid #000000">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="5" STYLE="BORDER-RIGHT:1px solid #000000; BORDER-BOTTOM:1px solid #000000; padding-right:2pt"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;Type of Reporting
Person</P> <P STYLE="font-size:12pt; margin-top:0pt; margin-bottom:0pt">&nbsp;</P> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:10pt; font-family:Times New Roman">&nbsp;&nbsp;CO</P></TD></TR>
</TABLE> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">(1)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">Includes (i) 727,645 shares of Pioneer Common Stock (as defined in Item 1 herein) of the Issuer (as defined in
Item 1 herein) held by the Supporting Holders (as defined in Item 3 herein) and (ii) 9,860,997 shares of Pioneer Common Stock issuable upon conversion of the Pioneer Convertible Notes (as defined in Item 4 herein) held by the Supporting Holders.
</P></TD></TR></TABLE>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">(2)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">The Reporting Person (as defined in Item 2 herein) does not own any shares of Pioneer Common Stock. However,
because the Reporting Person is a party to the Voting Agreements (as defined in Item 3 herein) and was granted a proxy to vote the Supporting Holders&#146; Covered Securities (as defined in Item 4 herein) pursuant to such agreements, the Reporting
Person may be deemed to have shared voting power to vote up to an aggregate of 10,588,642 shares of Pioneer Common Stock with respect to the matters covered by the Voting Agreements. Neither the filing of this statement on Schedule 13D nor any of
its contents shall be construed as an admission that the Reporting Person is, for the purposes of Section&nbsp;13(d) or 13(g) of the Exchange Act (as defined in Item 4 herein), the beneficial owner of any of the shares of Pioneer Common Stock
referred to herein. Pursuant to Rule <FONT STYLE="white-space:nowrap">13d-4,</FONT> the Reporting Person disclaims all such beneficial ownership. </P></TD></TR></TABLE>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%" VALIGN="top" ALIGN="left">(3)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">Calculation of percentage is based on (i)&nbsp;the 9,860,997 shares of Pioneer Common Stock issuable upon
conversion of the Pioneer Convertible Notes held by the Supporting Holders plus (ii)&nbsp;the 727,645 shares of Pioneer Common Stock held by the Supporting Holders divided by the sum of (x)&nbsp;the 9,860,997 shares of Pioneer Common Stock issuable
upon conversion of such Pioneer Convertible Notes and (y) 1,840,641 shares of Pioneer Common Stock issued and outstanding as of June&nbsp;29, 2021 as represented by the Issuer in the Merger Agreement (as defined in Item 3 herein).
</P></TD></TR></TABLE>
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<TR style = "page-break-inside:avoid">
<TD WIDTH="10%" VALIGN="top" ALIGN="left"><B>Item&nbsp;1.</B></TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><B>Security and Issuer. </B></P></TD></TR></TABLE>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">This Schedule 13D relates to the common stock, par value $0.001 per share (&#147;Pioneer Common Stock&#148;), of Pioneer Energy Services Corp., a Delaware
corporation (&#147;Pioneer&#148; or the &#147;Issuer&#148;). The principal executive offices of Pioneer are located at 1250 N.E. Loop 410, Suite 1000, San Antonio, Texas 78209. </P>
<P STYLE="font-size:18pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR style = "page-break-inside:avoid">
<TD WIDTH="10%" VALIGN="top" ALIGN="left"><B>Item&nbsp;2.</B></TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><B>Identity and Background. </B></P></TD></TR></TABLE>
<P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">a.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">This Schedule 13D is being filed by <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Energy, Inc., a
Delaware corporation <FONT STYLE="white-space:nowrap">(&#147;Patterson-UTI&#148;</FONT> or the &#147;Reporting Person&#148;). </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">b.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">The principal business address of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> is 10713 W. Sam Houston
Pkwy N, Suite 800, Houston, Texas 77064. </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">c.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><FONT STYLE="white-space:nowrap">Patterson-UTI&#146;s</FONT> principal business is the provision of onshore
contract drilling, pressure pumping and directional drilling services. </P></TD></TR></TABLE> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:9%; font-size:10pt; font-family:Times New Roman">The name, present principal occupation or
employment (and the name, principal business and address of any corporation or other organization in which such employment is conducted) and citizenship of each director and executive officer, as applicable, of the Reporting Person is set forth on
Schedule A, which is incorporated by reference herein. </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">d.&nbsp;-&nbsp;e.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">During the last five years, none of the Reporting Person or, to the knowledge of the Reporting Person, any of
the persons listed on Schedule A attached hereto have been convicted in a criminal proceeding (excluding traffic violations or similar misdemeanors) or been a party to a civil proceeding of a judicial or administrative body of competent jurisdiction
and as a result of such proceeding was or is subject to a judgment, decree or final order enjoining future violations of, or prohibiting or mandating activities subject to, federal or state securities laws or finding any violation with respect to
such laws. </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">f.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">As set forth in Schedule A hereto, each of the directors and executive officers of the Reporting Person is a
United States citizen. </P></TD></TR></TABLE> <P STYLE="font-size:18pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="10%" VALIGN="top" ALIGN="left"><B>Item&nbsp;3.</B></TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><B>Source and Amount of Funds or Other Consideration. </B></P></TD></TR></TABLE>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">On July&nbsp;5, 2021, <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> entered into an Agreement and Plan of Merger (the &#147;Merger
Agreement&#148;) with the Issuer, Crescent Merger Sub Inc., a Delaware corporation and wholly owned subsidiary of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> (&#147;Merger Sub Inc.&#148;), and Crescent Ranch Second Merger Sub LLC, a
Delaware limited liability company and wholly owned subsidiary of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> (&#147;Merger Sub LLC&#148;) pursuant to which <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> will acquire Pioneer in
exchange for a combination of cash and shares of common stock, par value $0.01 per share, of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> (the <FONT STYLE="white-space:nowrap">&#147;Patterson-UTI</FONT> Common Stock&#148;). </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">On July&nbsp;5, 2021, concurrently with the execution of the Merger Agreement, <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> entered
into Voting and Support Agreements (the &#147;Voting Agreements&#148;) with the (i)&nbsp;Advanced Series Trust &#150; AST BlackRock Global Strategies Portfolio, (ii)&nbsp;Arch Reinsurance Ltd., (iii) AST BlackRock Loomis Sayles Portfolio,
(iv)&nbsp;BlackRock 2022 Global Income Opportunity Trust, (v)&nbsp;BlackRock Core Bond Trust, (vi)&nbsp;BlackRock Corporate High Yield Fund, Inc., (vii) BlackRock Debt Strategies Fund, Inc., (viii) BlackRock Floating Rate Income Portfolio of
BlackRock Funds V, (ix)&nbsp;BlackRock Floating Rate Income Strategies Fund, Inc., (x) BlackRock Floating Rate Income Trust, (xi)&nbsp;BlackRock High Yield Bond Portfolio of BlackRock Funds V, (xii)&nbsp;BlackRock High Yield Portfolio of BlackRock
Series Fund II, Inc., (xiii) BlackRock High Yield V.I. Fund of BlackRock Variable Series Funds II, Inc., (xiv) BlackRock Limited Duration Income Trust, (xv)&nbsp;BlackRock Multi-Sector Income Trust, (xvi)&nbsp;BlackRock Multi-Sector Opportunities
Trust, (xvii)&nbsp;BlackRock Strategic Income Opportunities Portfolio of BlackRock Funds V, (xviii)&nbsp;Brighthouse Funds Trust I &#150; BlackRock High Yield Portfolio, (xix)&nbsp;California State Teachers&#146; Retirement System, (xx)&nbsp;High
Yield Bond Fund, (xxi)&nbsp;JPMBI RE BlackRock Bankloan Fund, (xxii)&nbsp;Master Total Return Portfolio Of Master Bond LLC, (xxiii)&nbsp;Pension Benefit Guaranty Corporation, (xxiv)&nbsp;Strategic Income Opportunities Bond Fund, (xxv)&nbsp;Ascribe
III Investments LLC, (xxvi)&nbsp;Bentham Syndicated Loan Fund, Bentham High Yield Fund, Bentham Strategic Loan Fund, Credit Suisse High Yield Bond Fund, Credit Suisse Floating Rate High Income Fund, Credit Suisse Asset Management Income Fund, Inc.,
Entsorgungsfonds Fur Kernkraftwerke, Credit Suisse Strategic Income Fund, Credit Suisse Nova (Lux) Global Senior Loan Fund, Credit Suisse (Lux) Global High Yield Bond Fund, Dollar Senior Loan Fund, Ltd., Dollar Senior Loan Master Fund II, Ltd., and
Copperhill Loan Fund I, LLC, (xxvii)&nbsp;MSD Credit Opportunity Fund, L.P., (xxviii) Redwood Master Fund, Ltd., (xxix) SOF Investments II, L.P., (xxx) Strategic Income Management, LLC, (xxxi)&nbsp;Whitebox Credit
</P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">
Partners, L.P., Whitebox Multi-Strategy Partners, L.P.; Pandora Select Partners, L.P.; Whitebox Relative Value Partners, L.P., and Whitebox GT Fund, LP, (xxxii)&nbsp;Loomis, Sayles&nbsp;&amp;
Company L.P., (xxxiii) FS Global Credit Opportunities Fund and (xxxiv)&nbsp;DW Value Master Fund, Ltd., DW Catalyst Master Fund, Ltd., and <FONT STYLE="white-space:nowrap">DW-TX,</FONT> LP (collectively, the &#147;Supporting Holders&#148;), pursuant
to which, among other things and subject to the terms and conditions therein, the Supporting Holders agreed to vote their shares (i)&nbsp;in favor of the matters to be submitted to Pioneer&#146;s stockholders in connection with the Mergers (as
defined in Item 4 herein) and (ii)&nbsp;against specific actions that could reasonably be expected to impede, interfere with, delay, discourage, postpone or adversely affect the transactions contemplated by the Merger Agreement (the
&#147;Transactions&#148;). </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The shares of Pioneer Common Stock to which this Schedule 13D relates have not been purchased by the Reporting
Person, and no funds were expended in consideration for the execution of either the Merger Agreement or the Voting Agreements. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The
information set forth or incorporated by reference in Item 4 is incorporated by reference in this Item 3. </P> <P STYLE="font-size:18pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR style = "page-break-inside:avoid">
<TD WIDTH="10%" VALIGN="top" ALIGN="left"><B>Item&nbsp;4.</B></TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><B>Purpose of Transaction. </B></P></TD></TR></TABLE>
<P STYLE="margin-top:6pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">(a)-(j) </P> <P STYLE="margin-top:18pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B><I>Merger Agreement </I></B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the terms of, and subject to the conditions set forth in, the Merger Agreement, (i)&nbsp;Merger Sub Inc. will merge with and into
Pioneer, with Pioneer continuing as the surviving entity (the &#147;Surviving Corporation&#148;) (the &#147;First Company Merger&#148;) and (ii)&nbsp;immediately following the First Company Merger, the Surviving Corporation will merge with and into
Merger Sub LLC, with Merger Sub LLC continuing as the surviving entity (the &#147;Surviving Company&#148;) (the &#147;Second Company Merger&#148; and, together with the First Company Merger, the &#147;Mergers&#148;). Under the terms of the Merger
Agreement, <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> will acquire Pioneer for aggregate consideration of up to 26,275,000 shares of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock and $30&nbsp;million of cash. As more
fully described in the Merger Agreement, all Pioneer debt is being retired in connection with the Mergers with a portion of such shares and cash and with Pioneer&#146;s cash on hand determined in accordance with the Merger Agreement prior to closing
(the &#147;Pioneer Cash&#148;). </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">As more fully described below, subject to certain exceptions, holders of Pioneer Common Stock and holders
of 5.00% Convertible Senior Unsecured PIK Notes due 2025 of Pioneer (the &#147;Pioneer Convertible Notes&#148;) will be issued shares of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock according to an exchange ratio (the
&#147;Exchange Ratio&#148;) to be determined at the closing of the Transactions. The Exchange Ratio will equal the quotient obtained by dividing (i) 26,275,000 (subject to a downward adjustment as specified in the Merger Agreement if the average of
the volume weighted average prices of the <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock <FONT STYLE="white-space:nowrap">(&#147;Patterson-UTI</FONT> VWAP&#148;) for the 10 consecutive trading days ending with the last complete
trading day prior to the closing date is greater than $11.00) less the shares of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock to be delivered to the holders of the Senior Secured Floating Rate Notes due 2025 of Pioneer (the
&#147;Pioneer Senior Notes&#148;) as described below, by (ii)&nbsp;the aggregate number of shares of Pioneer Common Stock issued and outstanding immediately prior to the effective time of the First Company Merger (the &#147;Effective Time&#148;)
plus the number of shares of Pioneer Common Stock into which the Pioneer Convertible Notes are convertible immediately prior to the Effective Time (assuming physical settlement as specified in the indenture governing the Pioneer Convertible Notes).
The shares of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock to be delivered to holders of Pioneer Common Stock and Pioneer Convertible Notes in the Transactions are referred to as the &#147;Merger Consideration.&#148; Upon
consummation of the Transactions, Pioneer will be a wholly owned subsidiary of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> and will no longer be a registrant under the rules of the United States Securities and Exchange Commission (the
&#147;Commission&#148;). </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Pursuant to the Merger Agreement, immediately prior to the Effective Time, subject to certain exceptions, each
share of Pioneer Common Stock then issued and outstanding will be converted into the right to receive a number of shares of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock equal to the Exchange Ratio. Each share of Pioneer Common
Stock held in treasury by Pioneer or owned directly or indirectly by <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> or Merger Sub Inc. will be automatically cancelled and will cease to exist, and no consideration will be issued therefor. In
addition, the Merger Agreement requires Pioneer to take the necessary steps under the indenture governing the Pioneer Convertible Notes to commence and effect an &#147;accelerated mandatory conversion&#148; of the Pioneer Convertible Notes no later
than the fifth trading day following the closing date. </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In connection with the closing under the Merger Agreement, the Pioneer Senior Notes will be
redeemed at a redemption price equal to 103% of the principal amount thereof, plus accrued and unpaid interest, if any, thereon to, but excluding, the closing date. In accordance with the Merger Agreement and the Third Supplemental Indenture to the
indenture governing the Pioneer Senior Notes (the &#147;Third Supplemental Indenture&#148;) to be entered into in connection with the Transactions, the redemption price will be paid in a combination of cash and shares of <FONT
STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock, which will reduce the number of shares to be delivered to holders of Pioneer Common Stock and Pioneer Convertible Notes. The amount of cash to be paid upon such redemption will not exceed
an amount equal to $30&nbsp;million plus the Pioneer Cash less the expenses to be paid by Pioneer in connection with the Transactions (&#147;Pioneer Expenses&#148;) less amounts required to repay in full and retire any indebtedness outstanding under
Pioneer&#146;s ABL credit facility (&#147;Pioneer ABL Payoff Amount&#148;) and less the amount of accrued interest on the Pioneer Convertible Notes (&#147;Pioneer Accrued Interest&#148;). The number of shares of
<FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock to be delivered in such redemption will equal (i)&nbsp;the redemption price (including accrued interest) less $30&nbsp;million less Pioneer Cash plus the Pioneer Expenses plus the
Pioneer ABL Payoff Amount and plus the Pioneer Accrued Interest, divided by (ii)&nbsp;the product of (x)&nbsp;the average of the <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> VWAP for the three consecutive trading days ending on the second
trading day immediately preceding the closing date and (y) 0.8575. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The closing of the Transactions is subject to the satisfaction or
waiver of certain closing conditions, including, among others, (i)&nbsp;the adoption of the Merger Agreement by the holders of at least sixty percent of the total voting power of all outstanding securities of Pioneer generally entitled to vote at a
meeting of Pioneer&#146;s stockholders (including the Pioneer Convertible Notes) pursuant to the terms of the Merger Agreement, (ii)&nbsp;the expiration or termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust
Improvements Act of 1976, (iii) there being no law, injunction or order by a governmental body prohibiting the consummation of the Mergers, (iv)&nbsp;the approval for listing of the <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock
to be issued in connection with the First Company Merger on the NASDAQ, (v)&nbsp;the registration statement on Form <FONT STYLE="white-space:nowrap">S-4,</FONT> to be filed with the Commission by
<FONT STYLE="white-space:nowrap">Patterson-UTI,</FONT> having been declared effective by the Commission, (vi)&nbsp;subject to specified materiality standards, the accuracy of the representations and warranties of the other party,
(vii)&nbsp;compliance by each other party in all material respects with their respective covenants, and (viii)&nbsp;execution and delivery of the Third Supplemental Indenture. In addition, the obligation of
<FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> to consummate the Transactions is further conditioned on the absence of a Company Material Adverse Effect (as defined in the Merger Agreement) and the requirement that not more than 6% of the
shares of Pioneer Common Stock outstanding immediately prior to the Mergers have validly exercised appraisal rights pursuant to Delaware law. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The foregoing summary of the Merger Agreement does not purport to be a complete description of the terms and conditions of such agreement, and
such description is qualified in its entirety by reference to the full text of the Merger Agreement, a copy of which is attached hereto as Exhibit A and is incorporated herein by reference. The foregoing summary of the Merger Agreement has been
included to provide investors and securityholders with information regarding the terms of the Merger Agreement and is not intended to provide any other factual information about the Issuer, the Reporting Person or their respective subsidiaries and
affiliates. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The representations, warranties and covenants contained in the Merger Agreement have been made solely for the benefit of the
parties thereto. In addition, such representations, warranties and covenants (i)&nbsp;have been made only for purposes of the Merger Agreement, (ii)&nbsp;have been qualified by (a)&nbsp;matters specifically disclosed in any reports filed by Pioneer
or <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> with the Commission prior to the date of the Merger Agreement (subject to certain exceptions) and (b)&nbsp;confidential disclosures made in confidential disclosure letters delivered in
connection with the Merger Agreement, (iii)&nbsp;are subject to materiality qualifications contained in the Merger Agreement which may differ from what may be viewed as material by investors, (iv)&nbsp;were made only as of the date of the Merger
Agreement or such other date as is specified in the Merger Agreement and (v)&nbsp;have been included in the Merger Agreement for the purpose of allocating risk between the contracting parties rather than establishing matters as fact. Accordingly,
the Merger Agreement is included with this filing only to provide investors with information regarding the terms of the Merger Agreement, and not to provide investors with any other factual information regarding the parties thereto or their
respective businesses. Investors should not rely on the representations, warranties and covenants or any descriptions thereof as characterizations of the actual state of facts or condition of the parties to the Merger Agreement or any of their
respective subsidiaries or affiliates. Moreover, information concerning the subject matter of the representations and warranties may change after the date of the Merger Agreement, which subsequent information may or may not be fully reflected in <FONT
STYLE="white-space:nowrap">Patterson-UTI&#146;s</FONT> or Pioneer&#146;s public disclosures. The Merger Agreement should not be read alone, but should instead be read in conjunction with the other information regarding
<FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> and Pioneer that is or will be contained in, or incorporated by reference into, the Annual Reports on Form <FONT STYLE="white-space:nowrap">10-K,</FONT> Quarterly Reports on Form <FONT
STYLE="white-space:nowrap">10-Q</FONT> and other documents that <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> or Pioneer files with the Commission. </P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B><I>Voting Agreements </I></B></P>
<P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">In connection with the Merger Agreement, the Supporting Holders, holding approximately 87.9% of the voting power of Pioneer, have entered into
Voting Agreements with the Reporting Person on substantially the same form (the &#147;Form of Voting Agreement&#148;), a copy of which is filed hereto as Exhibit B. Pursuant to the Pioneer certificate of incorporation, the holders of Pioneer
Convertible Notes are entitled to vote upon all matters upon which holders of Pioneer Common Stock have the right to vote under Delaware law or the Pioneer certificate of incorporation and are deemed to be Pioneer stockholders (and the Pioneer
Convertible Notes are deemed to be stock) for the purpose of any provision of Delaware law that requires the vote of stockholders as a prerequisite to any corporate action, including the Mergers. Pursuant to the Voting Agreements, among other
things, the Supporting Holders have agreed, subject to certain limitations and exceptions, not to transfer any of their Pioneer Common Stock or Pioneer Convertible Notes (collectively, the &#147;Covered Securities&#148;) until the earlier of the
date the Merger Agreement is terminated and the Effective Time and to vote such Covered Securities in a manner to facilitate the consummation of the Mergers. In addition, the Voting Agreements generally restrict transactions in <FONT
STYLE="white-space:nowrap">Patterson-UTI</FONT> Common Stock and derivative securities thereof, subject to certain exceptions. In the event the Pioneer board of directors withdraws its recommendation with respect to the Transactions, the Supporting
Holders remain obligated under the Voting Agreements to vote in favor of the Transactions. The voting obligation of the Supporting Holders under the Voting Agreements terminates only if the Merger Agreement is terminated. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">As of the date hereof, the Reporting Person does not own any shares of Pioneer Common Stock. However, because of the Supporting Holders&#146;
obligations under the Voting Agreements pursuant to which the Supporting Holders granted a proxy to vote their Covered Securities to the Reporting Person, the Reporting Person may be deemed to have shared voting power over such Covered Securities.
Thus, for purposes of Rule <FONT STYLE="white-space:nowrap">13d-3</FONT> promulgated under the Securities Exchange Act of 1934, as amended (the &#147;Exchange Act&#148;), the Reporting Person may be deemed to be the beneficial owner of certain
shares of Pioneer Common Stock. Neither the filing of this statement on Schedule 13D nor any of its contents shall be construed as an admission that the Reporting Person is, for the purposes of Section&nbsp;13(d) or 13(g) of the Exchange Act, the
beneficial owner of any of the shares of Pioneer Common Stock referred to herein. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The foregoing description of the Voting Agreements is
not intended to be complete and is qualified in its entirety by reference to the full text of the Form of Voting Agreement, a copy of which is filed hereto as Exhibit B, and which is incorporated herein by reference. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Transactions may, if consummated in accordance with their terms, result in any or all of the actions contemplated by subparagraphs (a)-(j)
of Item 4 of Schedule 13D, including, without limitation, (i)&nbsp;that, as a result of the Mergers, the Issuer will become a wholly owned subsidiary of the Reporting Person, (ii)&nbsp;the cessation of each existing Pioneer director&#146;s role as a
director of Pioneer, (iii)&nbsp;material changes in the capitalization, dividend policy, corporate structure and organizational documents of Pioneer and (iv)&nbsp;the termination of the registration of the Pioneer Common Stock under
Section&nbsp;12(g) of the Exchange Act. </P> <P STYLE="font-size:18pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="10%" VALIGN="top" ALIGN="left"><B>Item&nbsp;5.</B></TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><B>Interest in Securities of the Issuer. </B></P></TD></TR></TABLE>
<P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">a.&nbsp;-&nbsp;b.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">The response of the Reporting Person to rows 7 through 13 (including the footnotes) on the cover page of this
Schedule 13D are incorporated by reference herein. </P></TD></TR></TABLE> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:9%; font-size:10pt; font-family:Times New Roman">As of the date hereof, the Reporting Person does not own any shares
of Pioneer Common Stock. However, as a result of the Voting Agreements, the Reporting Person may be deemed to have shared voting power with respect to up to an aggregate of 10,588,642 shares of Pioneer Common Stock, and thus, for the purpose of Rule
<FONT STYLE="white-space:nowrap">13d-3</FONT> promulgated under the Exchange Act, the Reporting Person may be deemed to be the beneficial owner of an aggregate of 10,588,642 shares of Pioneer Common Stock. The aggregate number of shares of Pioneer
Common Stock (including the voting power of the Pioneer Convertible Notes) covered by the Voting Agreements represents approximately 90.5% of the outstanding Pioneer Common Stock as more fully described in footnote (3)&nbsp;on the cover page of this
Schedule 13D. </P> <P STYLE="margin-top:6pt; margin-bottom:0pt; margin-left:9%; font-size:10pt; font-family:Times New Roman">The filing of this statement on Schedule 13D shall not be construed as an admission that the Reporting Person is, for the
purposes of Section&nbsp;13(d) or 13(g) of the Exchange Act, the beneficial owner of any shares of Pioneer Common Stock. Pursuant to Rule <FONT STYLE="white-space:nowrap">13d-4,</FONT> the Reporting Person disclaims all such beneficial ownership.
</P>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; margin-left:9%; font-size:10pt; font-family:Times New Roman">To the Reporting Person&#146;s knowledge, none of persons listed in Schedule A hereto
beneficially own any shares of Pioneer Common Stock. </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">c.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">Except for the foregoing transactions and as set forth in this Schedule 13D with reference to the Merger
Agreement and the Voting Agreements, neither the Reporting Person nor, to the Reporting Person&#146;s knowledge, any of the persons listed in Schedule A hereto, has effected any transaction in shares of Pioneer Common Stock during the past 60 days.
</P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">d.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">The Reporting Person has no right to receive dividends from, or the proceeds from the sale of, any shares of
Pioneer Common Stock subject to the Voting Agreements. The Reporting Person will have no pecuniary interest in any shares of Pioneer Common Stock unless and until the Transactions are consummated. </P></TD></TR></TABLE>
<P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">e.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">Not applicable. </P></TD></TR></TABLE> <P STYLE="font-size:18pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="10%" VALIGN="top" ALIGN="left"><B>Item&nbsp;6.</B></TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><B>Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.
</B></P></TD></TR></TABLE> <P STYLE="margin-top:6pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The information set forth or incorporated by reference in Item 4 is incorporated by reference in this Item 6. </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The Reporting Person entered into a Confidentiality Agreement, dated as of April&nbsp;22, 2021, and a Confidentiality Agreement, dated as of
February&nbsp;22, 2021, with Pioneer (together, the &#147;Confidentiality Agreements&#148;) pursuant to which each party agreed to certain restrictions with respect to certain nonpublic information regarding the other party. In addition, the
Confidentiality Agreements provide that, for a period of six months from the respective dates thereof, without the prior written consent of the other party&#146;s Board of Directors, neither party nor any of its representatives acting on behalf or
in concert with such party shall, directly or indirectly: </P> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(a)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">make, effect, solicit, initiate, cause or participate in &#150; </P></TD></TR></TABLE>
<P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="13%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">i.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">any acquisition of beneficial ownership of any debt securities or equity securities (including derivatives
thereof) of the other party or debt securities or equity securities (including derivatives thereof) of any subsidiary or affiliate of the other party identified by the other party as such, or rights or options to acquire, or securities convertible
or exchangeable into, debt securities or equity securities of the other party or any such subsidiary or affiliate of the other party; </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="13%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">ii.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">any acquisition of any loans or assets of the other party or any loans or assets of any such subsidiary or
affiliate of the other party; </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="13%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">iii.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">any tender offer, exchange offer, merger, business combination, recapitalization, restructuring, liquidation,
dissolution or extraordinary transaction involving the other party or any such subsidiary or affiliate of the other party, or involving any debt or equity securities (including derivatives thereof) or loans or assets of the other party or any such
subsidiary or affiliate of the other party; or </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="13%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">iv.</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">any statement, public announcement, offer or proposal (including without limitation any
&#147;solicitation&#148; of &#147;proxies,&#148; as such terms are defined or used in Regulation 14A of the Commission under the Exchange Act, to the other party&#146;s board of directors, any of the other party&#146;s subsidiaries or affiliates
identified by the other party as such, or any of the other party&#146;s shareholders regarding or with respect to, or otherwise solicit, seek or offer to effect (including, for the avoidance of doubt, indirectly by means of communication with the
press or media), any of the actions described in (a)(i), (ii) or (iii)&nbsp;or (b), (c) or (d); </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(b)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">join, participate with, solicit, instigate, encourage or assist any third party (including forming a
&#147;group&#148; (as defined in the Exchange Act and the regulations thereunder) with any such third party) to take or do, or enter into any discussions or agreements with any third party with respect to, any of the actions set forth in (a), (c) or
(d); </P></TD></TR></TABLE>
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<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(c)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">act, alone or in concert with others, to seek representation on the other party&#146;s board of directors or to
control or influence the other party&#146;s board of directors, management or policies; </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(d)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">take any action that would reasonably be expected to require the other party or any of its affiliates to make a
public announcement regarding any of the actions set forth in (a), (b) or (c)&nbsp;above; </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(e)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">agree or offer to take, or encourage or propose (publicly or otherwise) the taking of, any action referred to
in (a), (b), (c) or (d); </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(f)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">assist, induce or encourage any other person to take any action of the types referred to in (a), (b), (c) or
(d); </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(g)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">enter into any discussion, negotiation, arrangement or agreement with any other person relating to any of the
foregoing; </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(h)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">request or propose that the other party or any of its representatives amend, modify, waive or consider the
amendment, modification or waiver of any provision set forth in (a), (b), (c), (d), (e), (f) or (g)&nbsp;or this paragraph (h); or </P></TD></TR></TABLE> <P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
<TABLE STYLE="BORDER-COLLAPSE:COLLAPSE; font-family:Times New Roman; font-size:10pt" BORDER="0" CELLPADDING="0" CELLSPACING="0" WIDTH="100%">
<TR style = "page-break-inside:avoid">
<TD WIDTH="4%">&nbsp;</TD>
<TD WIDTH="5%" VALIGN="top" ALIGN="left">(i)</TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left">initiate contact (except in the ordinary course of business) with any officer, director or employee of the
other party regarding the business, operations or prospects of the other party. </P></TD></TR></TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Each party further agreed that unless
otherwise directed by the other party in writing: (i)&nbsp;all communications with the other party regarding a possible transaction, (ii)&nbsp;requests for additional information, facility tours or meetings with management or employees, or
(iii)&nbsp;discussions or questions regarding procedures with respect to a possible transaction, will be submitted or directed by such party or its representatives only to the chief financial officer or the general counsel of the other party (or to
such other person as may hereafter be directed by the other party pursuant to written notice to such party), or, with respect to (i), to any director or executive officer of the other party as a response to any communication initiated by such
director or executive officer. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Under the terms of the Confidentiality Agreements, the restrictions in (a), (b), (c) and (d)&nbsp;above do
not apply to any of such party&#146;s representatives effecting or recommending transactions in securities (i)&nbsp;in the ordinary course of its business as an investment advisor, broker, dealer in securities, market maker, specialist or block
positioner, and (ii)&nbsp;not at the direction or request of such party or any of its affiliates. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">The standstill restrictions listed
above automatically terminate without further action and will be of no further force and effect, upon the earliest to occur of the following (i)&nbsp;six months following the respective dates of the Confidentiality Agreements or (ii)&nbsp;if the
other party enters into a definitive agreement with respect to, or publicly announces that it plans to enter into, or publicly recommends, a transaction involving all or a controlling portion of the other party&#146;s equity securities or at least
50% of the other party&#146;s consolidated assets (whether by merger, consolidation, business combination, tender or exchange offer, recapitalization, restructuring, sale, equity issuance or otherwise). </P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; text-indent:4%; font-size:10pt; font-family:Times New Roman">Except for the Confidentiality Agreements, the Merger Agreement and the Voting Agreements described above, to the knowledge of the Reporting
Person, there are no contracts, arrangements, understandings or relationships (legal or otherwise) among the persons named in Item 2 or between such persons and any other person, with respect to any securities of the Issuer, including any securities
pledged or otherwise subject to a contingency the occurrence of which would give another person voting power or investment power over such securities other than standard default and similar provisions contained in loan agreements. </P>
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<TD WIDTH="10%" VALIGN="top" ALIGN="left"><B>Item&nbsp;7.</B></TD>
<TD ALIGN="left" VALIGN="top"> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman; " ALIGN="left"><B>Material to be Filed as Exhibits. </B></P></TD></TR></TABLE>
<P STYLE="font-size:6pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top" NOWRAP>Exhibit&nbsp;A.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Agreement and Plan of Merger, dated as of July&nbsp;5, 2021, among Pioneer, the Reporting Person, Merger Sub Inc., and Merger Sub LLC (incorporated by reference to Exhibit 2.1 to the Reporting Person&#146;s Current Report on Form <FONT
STYLE="white-space:nowrap">8-K</FONT> (File <FONT STYLE="white-space:nowrap">No.&nbsp;001-39270)</FONT> filed with the Commission on July&nbsp;6, 2021).</TD></TR>
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<TD VALIGN="top" NOWRAP>Exhibit B.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Form of Voting and Support Agreement (incorporated by reference to Exhibit 10.1 to the Reporting Person&#146;s Current Report on Form <FONT STYLE="white-space:nowrap">8-K</FONT> (File
<FONT STYLE="white-space:nowrap">No.&nbsp;001-39270)</FONT> filed with the Commission on July&nbsp;6, 2021).</TD></TR>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SIGNATURE </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
</P> <P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top" COLSPAN="3"><FONT STYLE="white-space:nowrap">PATTERSON-UTI</FONT> ENERGY, INC.</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD>
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<TD VALIGN="top">Dated: July&nbsp;15, 2021</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">By:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"> <P STYLE="margin-top:0pt; margin-bottom:1pt; border-bottom:1px solid #000000; font-size:10pt; font-family:Times New Roman">/s/ C. Andrew Smith</P></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Name:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">C. Andrew Smith</TD></TR>
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<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top"></TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Title:</TD>
<TD VALIGN="bottom">&nbsp;</TD>
<TD VALIGN="top">Executive Vice President and Chief Financial Officer</TD></TR>
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 <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman" ALIGN="center"><B>SCHEDULE A </B></P>
<P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman">The name, title, present principal occupation or employment of each of the directors and executive officers of
<FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Energy, Inc. <FONT STYLE="white-space:nowrap">(&#147;Patterson-UTI&#148;),</FONT> are set forth below. Each <FONT STYLE="white-space:nowrap">non-management</FONT> director&#146;s business address
is c/o <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Energy, Inc., 10713 W. Sam Houston Pkwy N, Suite 800, Houston, Texas 77064, and each executive officer&#146;s business address is 10713 W. Sam Houston Pkwy N, Suite 800, Houston, Texas
77064. All of the individuals listed below are citizens of the United States. </P> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B><U>Directors</U></B>: </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TD WIDTH="35%"></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="32%"></TD>

<TD VALIGN="bottom" WIDTH="1%"></TD>
<TD WIDTH="31%"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" NOWRAP> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; display:table-cell; font-size:8pt; font-family:Times New Roman; "><B>Name</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Position at
<FONT STYLE="white-space:nowrap">Patterson-UTI</FONT></B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Present Principal</B></P>
<P STYLE="margin-top:0pt; margin-bottom:0pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Occupation or</B></P>
<P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Employment</B></P></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">William A. Hendricks, Jr.</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Director, President and Chief Executive Officer</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">President and Chief Executive Officer, <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Energy, Inc.</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Curtis W. Huff</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Chairman of the Board; Director</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Chairman, Freebird Partners</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Tiffany Thom Cepak</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Director</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Director, Penn Virginia Corporation; Director, California Resources Corporation</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Michael W. Conlon</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Director</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Retired Partner, Norton Rose Fulbright US LLP</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Terry H. Hunt</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Director</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Energy Consultant</TD></TR>
<TR STYLE="font-size:1pt">
<TD HEIGHT="8"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD>
<TD HEIGHT="8" COLSPAN="2"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Janeen S. Judah</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Director</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Director, general partner of Crestwood Equity Partners LP; Director, Aethon Energy III, LLC</TD></TR>
</TABLE> <P STYLE="margin-top:12pt; margin-bottom:0pt; font-size:10pt; font-family:Times New Roman"><B><U>Executive Officers (Who Are Not Directors)</U></B>: </P>
<P STYLE="font-size:12pt;margin-top:0pt;margin-bottom:0pt">&nbsp;</P>
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<TR>

<TD></TD>

<TD VALIGN="bottom" WIDTH="3%"></TD>
<TD WIDTH="83%"></TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:8pt">
<TD VALIGN="bottom" NOWRAP> <P STYLE=" margin-top:0pt ; margin-bottom:0pt; border-bottom:1.00pt solid #000000; display:table-cell; font-size:8pt; font-family:Times New Roman; "><B>Name</B></P></TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="bottom" ALIGN="center" STYLE="border-bottom:1.00pt solid #000000"> <P STYLE="margin-top:0pt; margin-bottom:1pt; font-size:8pt; font-family:Times New Roman" ALIGN="center"><B>Present Principal Occupation or Employment</B></P></TD></TR>


<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">C.&nbsp;Andrew&nbsp;Smith</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Executive Vice President and Chief Financial Officer</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Kenneth&nbsp;N.&nbsp;Berns</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Executive Vice President and Chief Commercial Officer</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">Seth D. Wexler</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">Senior Vice President, General Counsel and Secretary</TD></TR>
<TR STYLE="page-break-inside:avoid ; font-family:Times New Roman; font-size:10pt">
<TD VALIGN="top">James&nbsp;M.&nbsp;Holcomb</TD>
<TD VALIGN="bottom">&nbsp;&nbsp;</TD>
<TD VALIGN="top">President of <FONT STYLE="white-space:nowrap">Patterson-UTI</FONT> Drilling Company LLC</TD></TR>
</TABLE>
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