{\rtf1\deflang1033\deflangfe1033\margl720\margr720\margt360\margb360{\stylesheet{\fs20\lang1033\snext0 Normal;} {\s1\sb240\keepn{\*\pn \pnlvl1\pndec\pnprev1\pnstart1\pnsp144}\b\f0\fs30\lang1033 \sbasedon0\snext0 heading 1;} {\s2\sb200\keepn{\*\pn \pnlvl2\pndec\pnprev1\pnstart1\pnsp144{\pntxtb.}}\b\f0\fs26\lang1033 \sbasedon0\snext0 heading 2;} {\s3\sb180\keepn{\*\pn \pnlvl3\pndec\pnprev1\pnstart1\pnsp144{\pntxtb.}}\b\f0\fs22\lang1033 \sbasedon0\snext0 heading 3;} {\s4\sb160\keepn{\*\pn \pnlvl4\pnucltr\pnprev1\pnstart1\pnsp144{\pntxtb.}}\b\f0\fs22\lang1033 \sbasedon0\snext0 heading 4;} {\s5\sb140\keepn{\*\pn \pnlvl5\pncltr\pnprev1\pnstart1\pnsp144}\b\f0\fs20\lang1033 \sbasedon0\snext0 heading 5;} {\s6\tqc\lang1033\sbasedon0\snext6 footer;} {\*\cs16 \additive\super\sbasedon10 footnote reference;} {\*\cs18 \additive\sbasedon10 page number;}} {\fonttbl{\f0\fnil Times New Roman;}{\f1\fnil Courier New}{\f2005\fnil Courier New;}{\f2010\fnil Wingdings;}{\f2020\fnil Webdings;}{\f2\fnil Arial;}{\f3\fnil Arial;}{\f4\fnil LucidaHandwriting;}{\f5\fnil Symbol;}{\f6\fnil Symbol;}{\f7\fnil Ferdsch;}{\f30\fnil Myriad Cn Semibold;}{\f31\fnil Myriad Roman;}{\f50\fnil Courier New;}{\f51\fnil Times New Roman;}{\f52\fnil Arial;}{\f53\fnil Symbol;}{\f54\fnil Wingdings;}{\f55\fnil Wingdings 2;}{\f56\fnil Wingdings 3;}{\f57\fnil Webdings;}{\f58\fnil Arial Narrow;}{\f59\fnil Arial Unicode MS;}{\f60\fnil Cyberbit;}{\f61\fnil Morningstar 1U Light;}{\f62\fnil Calibri;}} {\colortbl;\red0\green0\blue0;\red127\green0\blue0;\red0\green0\blue255;\red127\green127\blue127;\red0\green51\blue153;\red255\green204\blue0;\red255\green255\blue255;\red246\green244\blue236;\red0\green0\blue0;} {\*\bkmkstart filing_1}{\*\bkmkend filing_1}{\*\bkmkstart doc_1_1}{\*\bkmkend doc_1_1}\par\pard\plain\f0\fs16\par\pard\plain\cf1\f50\fs16\ql SECURITIES AND EXCHANGE COMMISSION \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Washington, D.C. 20549 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql SCHEDULE 13D \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Under the Securities Exchange Act of 1934 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Amendment No. 3 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Pioneer Natural Resources Company \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql ________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (Name of Issuer) \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Common Stock \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (Title of Class and Securities) \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 723787107 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (CUSIP Number of Class of Securities) \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql O. Mason Hawkins \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Chairman of the Board and C.E.O. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql and \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Vice President & General Counsel \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Southeastern Asset Management, Inc. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 6410 Poplar Avenue, Suite 900 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Memphis, TN 38119 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (901) 761-2474 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql ___________________________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (Name, Address and Telephone Number of Person Authorized to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Receive Notices and Communications) \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql June 24, 2022 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql ___________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (Date of Event which Requires \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Filing of this Statement) \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql If the filing person has previously filed a statement on Schedule 13G to report \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the acquisition which is the subject of this Schedule 13D, and is filing this \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Schedule because of Sections 240.13d-1(e), 240.13d-1(f), or 240.13d-1(g), check \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the following box: [X] \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql CUSIP No. 723787107 13D \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (1) NAMES OF REPORTING PERSONS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Southeastern Asset Management, Inc. I.D. No. 62-0951781 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (a) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (b) X \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (3) SEC USE ONLY \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (4) SOURCE OF FUNDS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 00: Funds of investment advisory clients \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (5) CHECK BOX IF DISCOSURE OF LEGAL PROCEEDINGS IS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) [ ] \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (6) CITIZENSHIP OR PLACE OF ORGANIZATION \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Tennessee \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(7) SOLE VOTING POWER \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : (Discretionary Accounts) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql NUMBER OF SHARES BENEFICIALLY : 6,290,091 shares \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql OWNED BY EACH REPORTING PERSON __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql WITH :(8) SHARED OR NO VOTING POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : 12,092,900 shares (Shared) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : 1,938,800 shares (No Vote) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(9) SOLE DISPOSITIVE POWER \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (Discretionary Accounts) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : 8,228,891 shares \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(10) SHARED DISPOSITIVE POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : 12,092,900 shares (Shared) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : 0 shares (None) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 20,321,791 shares \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql CERTAIN SHARES \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 17.5 % \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (14) TYPE OF REPORTING PERSON \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql IA \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql CUSIP No. 723787107 13D \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (1) NAMES OF REPORTING PERSONS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Longleaf Partners Fund I.D. No. 63-6147721 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (a) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (b) X \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (3) SEC USE ONLY \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (4) SOURCE OF FUNDS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 00: Funds of investment company shareholders \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEDDINGS IS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql REQUIRED PURSUANT TO ITEMS 2(d) or 29e) [ ] \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (6) CITIZENSHIP OR PLACE OF ORGANIZATION \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Massachusetts \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(7) SOLE VOTING POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql NUMBER OF SHARES BENEFICIALLY : None \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql OWNED BY EACH REPORTING PERSON __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql WITH :(8) SHARED VOTING POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : 8,657,900 shares (Shared) \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(9) SOLE DISPOSITIVE POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : None \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(10) SHARED DISPOSITIVE POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : 8,657,900 shares (Shared) \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 8,657,900 shares \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql CERTAIN SHARES \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 7.5 % \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (14) TYPE OF REPORTING PERSON \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql IV \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql CUSIP No. 723787107 13D \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (1) NAMES OF REPORTING PERSONS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql O. Mason Hawkins I.D. No. XXX-XX-XXXX \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP: \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (a) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (b) X \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (3) SEC USE ONLY \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (4) SOURCE OF FUNDS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 00: None \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (5) CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql REQUIRED PURSUANT TO ITEMS 2(d) or 2(e) [ ] \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (6) CITIZENSHIP OR PLACE OF ORGANIZATION \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Citizen of United States \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(7) SOLE VOTING POWER \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : (Discretionary Accounts) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql NUMBER OF SHARES BENEFICIALLY : None \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql OWNED BY EACH REPORTING PERSON __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql WITH :(8) SHARED VOTING POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : None \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(9) SOLE DISPOSITIVE POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : None \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql __________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql :(10) SHARED DISPOSITIVE POWER \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql : None \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (11) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql None (See Item 3) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (12) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql CERTAIN SHARES [ ] \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (13) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 0.0 % \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (14) TYPE OF REPORTING PERSON \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql IN \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _____________________________________________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 5. Interest In Securities Of The Issuer \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 5 shall be amended and restated as follows: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (a) The aggregate number and percentage of Securities to which this \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Schedule 13D relates is 20,321,791 shares of the common stock of the Issuer, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql constituting approximately 17.5% of the 115,929,792 shares outstanding. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Common % of outstanding \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Shares Common Shares \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Held \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql ___________________________________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Voting Authority \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sole: 6,290,091 5.4% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Shared: 12,092,900* 10.4% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql None: 1,938,800 1.7% \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Total 20,321,791 17.5% \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql *Consists of shares owned by Longleaf Partners Fund and Longleaf Partners \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Small-Cap Fund, each a series of Longleaf Partners Funds Trust, an open-end \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql management investment company registered under the Investment Company Act of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 1940. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Dispositive Authority \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sole: 8,228,891 7.1% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Shared: 12,092,900* 10.4% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql None: 0 0.0% \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Total 20,321,791 17.5% \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql *Consists of shares owned by Longleaf Partners Fund and Longleaf Partners \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Small-Cap Fund, each a series of Longleaf Partners Funds Trust, an open-end \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql management investment company registered under the Investment Company Act of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 1940. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (b) Southeastern generally has the sole power to dispose of or to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql direct the disposition of the Securities held for discretionary accounts of its \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql investment clients, and may be granted the sole power to vote or direct the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql vote of such Securities; such powers may be retained by or shared with the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql respective clients for shared or non-discretionary accounts. Shares held by \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql any Series of Longleaf Partners Funds Trust are reported in the "shared" \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql category. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (c) Purchase or sale transactions in the Securities during the past \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql sixty days are disclosed on Schedule II. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (d) The investment advisory clients of Southeastern have the sole \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql right to receive and, subject to notice, to withdraw the proceeds from the sale \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of the Securities, and the sole power to direct the receipt of dividends from \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql any of the Securities held for their respective accounts. Such clients may \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql also terminate the investment advisory agreements without penalty upon \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql appropriate notice. Southeastern does not have an economic interest in any of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the Securities reported herein. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (e) Not applicable. \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Signatures \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql After reasonable inquiry and to the best of my knowledge and belief, I certify \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql that the information set forth in this statement is true, complete and correct. \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Dated: June 28, 2022 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Southeastern Asset Management, Inc. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By /s/ Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Vice President and General Counsel \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Longleaf Partners Fund \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By: Southeastern Asset Management, Inc. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql /s/ Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Vice President & General Counsel \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql O. Mason Hawkins, Individually \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql /s/ O. Mason Hawkins \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Joint Filing Agreement \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql In accordance with Rule 13d-1(k) under the Securities Exchange Act \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of 1934, the persons or entities named below agree to the joint \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql filing on behalf of each of them of this Amendment No. 3 to Schedule 13D with \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql respect to the Securities of the Issuer and further agree that this joint \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql filing agreement be included as an exhibit to this Amendment No. 3 to Schedule \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 13D. In evidence thereof, the undersigned hereby execute this Agreement as \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of June 28, 2010. \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Southeastern Asset Management, Inc. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By /s/ Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Vice President and General Counsel \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Longleaf Partners Fund \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By: Southeastern Asset Management, Inc. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql /s/ Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________ \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Andrew R. McCarroll \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Vice President & General Counsel \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql O. Mason Hawkins, Individually \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql /s/ O. Mason Hawkins \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql _______________________________________________ \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Schedule II \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Transactions in the Last Sixty Days \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Transaction Type Date # of Shares Price per Share * \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sale 05/05/2022 6849 $62.38 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sale 06/03/2022 1000 $66.94 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sale 06/09/2022 6200 $66.28 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sale 06/15/2010 20000 $70.79 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sale 06/24/2010 537201 $65.31 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sale 06/25/2010 742799 $65.34 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sale 06/28/1010 100 $65.46 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Sales by Southeastern private account clients in the ordinary course of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql business on the New York Stock Exchange or through Electronic \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Communication Networks (ECNs). \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql * Net of commissions \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 1 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql SCHEDULE 13D Pioneer Natural Resources Company ("Issuer") \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 8 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16}