{\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 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\~\par\pard\plain\cf1\f51\fs20\qc SECURITIES AND EXCHANGE COMMISSION\par\pard\plain\cf1\f51\fs20\qc Washington, D.C. 20549\par\pard\plain\cf1\f51\fs20\qc \~\par\pard\plain\cf1\f51\fs20\qc Schedule 13G\par\pard\plain\cf1\f51\fs20\qc \~\par\pard\plain\cf1\f51\fs20\qc Under the Securities Exchange Act of 1934\par\pard\plain\cf1\f51\fs20\qc (Amendment No.:1 )*\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Name of issuer:\~ Pioneer Natural Resources Co\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Title of Class of Securities:\~\~Common Stock\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql CUSIP Number:\~\~723787107\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Date of Event Which Requires Filing of this Statement:\plain\cf1\f51\fs20\b\ql December 31, 2011\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Check the appropriate box to designate the rule pursuant to which this Schedule is filed:\par\pard\plain\cf1\f51\fs20\ql \~\~(X) Rule 13d-1(b)\par\pard\plain\cf1\f51\fs20\ql \~\~(\~ ) Rule 13d-1(c)\par\pard\plain\cf1\f51\fs20\ql \~\~(\~ ) Rule 13d-1(d)\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the\plain\cf1\f51\fs20\ql subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided\plain\cf1\f51\fs20\ql in a prior cover page.\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of\plain\cf1\f51\fs20\ql the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject\plain\cf1\f51\fs20\ql to all other provisions of the Act (however, see the Notes).\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql (Continued on the following page(s))\par\pard\plain\cf1\f51\fs20\ql \~{\*\bkmkstart _bclfooter1_8046710}{\*\bkmkend _bclfooter1_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\f0\fs4\par\pard\plain\f0\fs2\brdrt\brdrs\brdrw15\brdrcf2\brdrsp0\par\pard\plain\f0\fs4\par \page\par\pard\plain\cf1\f51\fs20\ql \~{\*\bkmkstart page_2_8046710}{\*\bkmkend page_2_8046710}{\*\bkmkstart _bclpageborder2_8046710}{\*\bkmkend _bclpageborder2_8046710}{\*\bkmkstart _bclheader2_8046710}{\*\bkmkend _bclheader2_8046710}{\*\bkmkstart _hlk316556443_8046710}{\*\bkmkend _hlk316556443_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\cf1\f51\fs20\qc 13G\par\pard\plain\cf1\f51\fs20\ql CUSIP No.:\~\~723787107\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 1.\~\~NAME OF REPORTING PERSON\par\pard\plain\cf1\f51\fs20\ql \~\~S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~THE VANGUARD GROUP, INC. - 23-1945930\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 2.\~\~CHECK THE APPROPRIATE [LINE] IF A MEMBER OF A GROUP\par\pard\plain\cf1\f51\fs20\ql \~ \par\pard\plain {\trowd\cellx3553\cellx7560\trrh369 \pard\plain\intbl\cf1\f51\fs20\ql A.\cell\pard\plain\intbl\cf1\f51\fs20\ql B.\plain\intbl\cf1\f51\fs20\ul\ql X\~\cell{ {\trowd\cellx3553\cellx7560\trrh369\row}}}\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 3.\~\~SEC USE ONLY\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 4.\~\~CITIZENSHIP OF PLACE OF ORGANIZATION\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Pennsylvania\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql (For questions 5-8, report the number of shares beneficially owned by each reporting person with:)\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 5.\~ SOLE VOTING POWER\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~170,395\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 6.\~ SHARED VOTING POWER\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~\~\~\~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 7.\~\~SOLE DISPOSITIVE POWER\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~6,222,112\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 8.\~\~SHARED DISPOSITIVE POWER\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~170,395\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 9.\~\~AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~6,392,507\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 10.\~\~CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~N/A\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 11.\~\~PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~5.24%\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql 12.\~\~TYPE OF REPORTING PERSON\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~IA{\*\bkmkstart _bclfooter2_8046710}{\*\bkmkend _bclfooter2_8046710}{\*\bkmkstart _hlk316556444_8046710}{\*\bkmkend _hlk316556444_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\f0\fs4\par\pard\plain\f0\fs2\brdrt\brdrs\brdrw15\brdrcf2\brdrsp0\par\pard\plain\f0\fs4\par \page\par\pard\plain\cf1\f51\fs20\ql \~{\*\bkmkstart page_3_8046710}{\*\bkmkend page_3_8046710}{\*\bkmkstart _bclpageborder3_8046710}{\*\bkmkend _bclpageborder3_8046710}{\*\bkmkstart _bclheader3_8046710}{\*\bkmkend _bclheader3_8046710}{\*\bkmkstart _hlk316556445_8046710}{\*\bkmkend _hlk316556445_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\cf1\f51\fs20\qc SECURITIES AND EXCHANGE COMMISSION\par\pard\plain\cf1\f51\fs20\qc Washington, D.C. 20549\par\pard\plain\cf1\f51\fs20\qc \~\par\pard\plain\cf1\f51\fs20\qc SCHEDULE 13G\par\pard\plain\cf1\f51\fs20\qc Under the Securities Act of 1934\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Check the following [line] if a fee is being paid with this statement\~\~ N/A\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 1(a) - Name of Issuer:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Pioneer Natural Resources Co\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 1(b) - Address of Issuer's Principal Executive Offices:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~5205 N. O'CONNOR BLVD.\par\pard\plain\cf1\f51\fs20\ql \~\~SUITE 200\par\pard\plain\cf1\f51\fs20\ql \~\~IRVING, TEXAS\~ 75039\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 2(a) - Name of Person Filing:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~THE VANGUARD GROUP, INC. - 23-1945930\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 2(b) \u8211? Address of Principal Business Office or, if none, residence:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~100 Vanguard Blvd.\par\pard\plain\cf1\f51\fs20\ql \~ Malvern, PA\~ 19355\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 2(c) \u8211? Citizenship:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Pennsylvania\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 2(d) - Title of Class of Securities:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Common Stock\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 2(e) - CUSIP Number\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~723787107\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 3 - Type of Filing:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~This statement is being filed pursuant to Rule 13d-1.\~\~An investment adviser in accordance with \u167?240.13d-1(b)(1)(ii)(E).\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 4 - Ownership:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~ (a) Amount Beneficially Owned:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~6,392,507\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~ (b) Percent of Class:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~5.24%{\*\bkmkstart _bclfooter3_8046710}{\*\bkmkend _bclfooter3_8046710}{\*\bkmkstart _hlk316556446_8046710}{\*\bkmkend _hlk316556446_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\f0\fs4\par\pard\plain\f0\fs2\brdrt\brdrs\brdrw15\brdrcf2\brdrsp0\par\pard\plain\f0\fs4\par \page\par\pard\plain\cf1\f51\fs20\ql \~{\*\bkmkstart page_4_8046710}{\*\bkmkend page_4_8046710}{\*\bkmkstart _bclpageborder4_8046710}{\*\bkmkend _bclpageborder4_8046710}{\*\bkmkstart _bclheader4_8046710}{\*\bkmkend _bclheader4_8046710}{\*\bkmkstart _hlk316556447_8046710}{\*\bkmkend _hlk316556447_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~(c)\~\~Number of shares as to which such person has:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~(i)\~\~sole power to vote or direct to vote:\~\~170,395\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~(ii)\~\~shared power to vote or direct to vote:\~\~\~\~\~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~(iii)\~\~sole power to dispose of or to direct the disposition of:\~\~6,222,112\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~(iv)\~\~shared power to dispose or to direct the disposition of:\~\~170,395\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Comments:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 5 - Ownership of Five Percent or Less of a Class:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Not Applicable\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 6 - Ownership of More Than Five Percent on Behalf of Another Person:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Not applicable\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 7 - Identification and Classification of the Subsidiary Which Acquired The Security Being Reported on by the Parent\plain\cf1\f51\fs20\ul\ql Holding Company\plain\cf1\f51\fs20\ql :\~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~See Attached Appendix A\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 8 - Identification and Classification of Members of Group:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Not applicable\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 9 - Notice of Dissolution of Group:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~Not applicable\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Item 10 - Certification:\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired in the\plain\cf1\f51\fs20\ql ordinary course of business and were not acquired for the purpose of and do not have the effect of changing or influencing the\plain\cf1\f51\fs20\ql control of the issuer of such securities and were not acquired in connection with or as a participant in any transaction having\plain\cf1\f51\fs20\ql such purpose or effect.\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ul\ql Signature\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\~After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is\plain\cf1\f51\fs20\ql true, complete and correct.\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Date:\~\~02/06/2012\par\pard\plain\cf3\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\qc By\plain\cf1\f51\fs20\ul\qc /s/ F. William McNabb III*\plain\cf1\f51\fs20\qc \~\par\pard\plain\cf1\f51\fs20\qc \~\par\pard\plain\cf1\f51\fs20\qc F. William McNabb III\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\qc President and Chief Executive Officer\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql *By: /s/ Glenn Booraem\par\pard\plain\li550\cf1\f51\fs20\ql Glenn Booraem, pursuant to a Power of Attorney filed January 29, 2010, see File Number 005-81485, Incorporated by\plain\li550\cf1\f51\fs20\ql Reference{\*\bkmkstart _bclfooter4_8046710}{\*\bkmkend _bclfooter4_8046710}{\*\bkmkstart _hlk316556448_8046710}{\*\bkmkend _hlk316556448_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\f0\fs4\par\pard\plain\f0\fs2\brdrt\brdrs\brdrw15\brdrcf2\brdrsp0\par\pard\plain\f0\fs4\par \page\par\pard\plain\cf1\f51\fs20\ql \~{\*\bkmkstart page_5_8046710}{\*\bkmkend page_5_8046710}{\*\bkmkstart _bclpageborder5_8046710}{\*\bkmkend _bclpageborder5_8046710}{\*\bkmkstart _bclheader5_8046710}{\*\bkmkend _bclheader5_8046710}{\*\bkmkstart _hlk316556449_8046710}{\*\bkmkend _hlk316556449_8046710}\par\pard\plain\cf1\f50\fs24\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Appendix A\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql Pursuant to the instructions of Item 7 of Schedule 13G, Vanguard Fiduciary Trust Company ("VFTC"), a wholly-owned\plain\cf1\f51\fs20\ql subsidiary of The Vanguard Group, Inc., is the beneficial owner of 170,395 shares or\~ .13% of the Common Stock outstanding of\plain\cf1\f51\fs20\ql the Company as a result of its serving as investment manager of collective trust accounts. VFTC directs the voting of these\plain\cf1\f51\fs20\ql shares.\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\qc By\plain\cf1\f51\fs20\ul\qc /s/ F. William McNabb III*\plain\cf1\f51\fs20\qc \~\par\pard\plain\cf1\f51\fs20\qc \~\par\pard\plain\cf1\f51\fs20\qc F. William McNabb III\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\qc President and Chief Executive Officer\par\pard\plain\cf1\f51\fs20\ql \~\par\pard\plain\cf1\f51\fs20\ql *By: /s/ Glenn Booraem\par\pard\plain\li550\cf1\f51\fs20\ql Glenn Booraem, pursuant to a Power of Attorney filed on January 29, 2010, see File Number 005-81485, Incorporated by\plain\li550\cf1\f51\fs20\ql Reference\par\pard\plain\cf1\f50\fs24\ql \~}