{\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\fs16\pard\plain\cf1\f50\fs16\ql SCHEDULE 13G \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Amendment No. 1 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Pioneer Natural Resources Company \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Common Stock \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Cusip #723787107 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Cusip #723787107 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 1: Reporting Person - FMR Corp. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 4: Delaware \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 5: 6,672 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 6: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 7: 2,214,852 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 8: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 9: 2,214,852 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 11: 1.844% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 12: HC \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Cusip #723787107 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 1: Reporting Person - Edward C. Johnson 3d \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 4: United States of America \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 5: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 6: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 7: 2,214,852 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 8: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 9: 2,214,852 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 11: 1.844% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 12: IN \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Cusip #723787107 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 1: Reporting Person - Abigail P. Johnson \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 4: United States of America \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 5: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 6: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 7: 2,214,852 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 8: 0 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 9: 2,214,852 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 11: 1.844% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 12: IN \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql SCHEDULE 13G - TO BE INCLUDED IN \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql STATEMENTS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) \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 1(a). Name of Issuer: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Pioneer Natural Resources Company \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 1(b). Name of Issuer's Principal Executive Offices: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 1400 Williams Square West \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 5205 North O'Connor Boulevard \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Irving, TX 75039 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 2(a). Name of Person Filing: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FMR Corp. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 2(b). Address or Principal Business Office or, if None, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Residence: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 82 Devonshire Street, Boston, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Massachusetts 02109 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 2(c). Citizenship: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Not applicable \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 2(d). Title of Class of Securities: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Common Stock \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 2(e). CUSIP Number: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 723787107 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 3. This statement is filed pursuant to Rule 13d-1(b) or 13d-2(b) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql and the person filing, FMR Corp., is a parent holding company \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql in accordance with Section 240.13d-1(b)(ii)(G). (Note: See \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 7). \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 4. Ownership \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (a) Amount Beneficially Owned: 2,214,852 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (b) Percent of Class: 1.844% \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (c) Number of shares as to which such \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql person has: \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (i) sole power to vote or to direct \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the vote: 6,672 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (ii) shared power to vote or to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql direct the vote: 0 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (iii) sole power to dispose or to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql direct the disposition of: 2,214,852 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (iv) shared power to dispose or to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql direct the disposition of: 0 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 5. Ownership of Five Percent or Less of a Class. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql If this statement is being filed to report the fact that as of the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql date hereof, the reporting person has ceased to be the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql beneficial owner of more than five percent of the class of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql securities, check the following (X). \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 6. Ownership of More than Five Percent on Behalf of Another \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Person. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Not applicable \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 7. Identification and Classification of the Subsidiary Which \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Acquired the Security Being Reported on By the Parent \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Holding Company. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql See attached Exhibit(s) A, B, and C. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 8. Identification and Classification of Members of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the Group. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Not Applicable. See attached Exhibit A. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 9. Notice of Dissolution of Group. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Not applicable. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Item 10. Certification. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Inasmuch as the reporting persons are no longer the beneficial \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql owners of more than five percent of the number of shares \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql outstanding, the reporting persons have no further reporting \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql obligation under Section 13(d) of the Securities and Exchange \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Commission thereunder, and the reporting persons have no \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql obligation to amend this Statement if any material change \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql occurs in the facts set forth herein. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Signature \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 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql belief, I certify that the information set forth in this Schedule \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 13G in connection with FMR Corp.'s beneficial ownership of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the Common Stock of Pioneer Natural Resources Company at \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql September 30, 2021 is true, complete and correct. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql October 12, 2021 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Date \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql /s/Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Signature \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Duly authorized under Power of Attorney \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql dated December 30, 2021 by and on behalf \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of FMR Corp. and its direct and indirect \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql subsidiaries \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql SCHEDULE 13G - TO BE INCLUDED IN \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql STATEMENTS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Pursuant to the instructions in Item 7 of Schedule \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 13G, Fidelity Management & Research Company \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql ("Fidelity"), 82 Devonshire Street, Boston, Massachusetts \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 02109, a wholly-owned subsidiary of FMR Corp. and an \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql investment adviser registered under Section 203 of the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Investment Advisers Act of 1940, is the beneficial owner of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 2,208,263 shares or 1.839% of the Common Stock \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql outstanding of Pioneer Natural Resources Company ("the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Company") as a result of acting as investment adviser to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql various investment companies registered under Section 8 of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the Investment Company Act of 1940. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Edward C. Johnson 3d, FMR Corp., through its \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql control of Fidelity, and the funds each has sole power to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql dispose of the 2,208,263 shares owned by the Funds. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Neither FMR Corp. nor Edward C. Johnson 3d, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Chairman of FMR Corp., has the sole power to vote or direct \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the voting of the shares owned directly by the Fidelity Funds, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql which power resides with the Funds' Boards of Trustees. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Fidelity carries out the voting of the shares under written \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql guidelines established by the Funds' Boards of Trustees. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Strategic Advisers, Inc., 82 Devonshire Street, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Boston, MA 02109, a wholly-owned subsidiary of FMR \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Corp. and an investment adviser registered under Section 203 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of the Investment Advisers Act of 1940, provides investment \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql advisory services to individuals. As such, FMR Corp.'s \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql beneficial ownership includes 289 shares, or 0.000%, of the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Common Stock stock outstanding of Pioneer Natural \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Resources Company, beneficially owned through Strategic \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Advisers, Inc. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Members of the Edward C. Johnson 3d family are the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql predominant owners of Class B shares of common stock of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FMR Corp., representing approximately 49% of the voting \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql power of FMR Corp. Mr. Johnson 3d owns 12.0% and \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Abigail Johnson owns 24.5% of the aggregate outstanding \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql voting stock of FMR Corp. Mr. Johnson 3d is Chairman of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FMR Corp. and Abigail P. Johnson is a Director of FMR \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Corp. The Johnson family group and all other Class B \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql shareholders have entered into a shareholders' voting \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql agreement under which all Class B shares will be voted in \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql accordance with the majority vote of Class B shares. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Accordingly, through their ownership of voting common \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql stock and the execution of the shareholders' voting \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql agreement, members of the Johnson family may be deemed, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql under the Investment Company Act of 1940, to form a \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql controlling group with respect to FMR Corp. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Fidelity International Limited, Pembroke Hall, 42 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Crowlane, Hamilton, Bermuda, and various foreign-based \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql subsidiaries provide investment advisory and management \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql services to a number of non-U.S. investment companies (the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql "International Funds") and certain institutional investors. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Fidelity International Limited is the beneficial owner of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 6,300 shares or 0.005% of the Common Stock outstanding of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the Company. Additional information with respect to the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql beneficial ownership of Fidelity International Limited is \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql shown on Exhibit B. \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 13G - TO BE INCLUDED IN \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql STATEMENTS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Pursuant to instructions in Item 7 of Schedule 13G, this \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Exhibit has been prepared to identify Fidelity International \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Limited, Pembroke Hall, 42 Crow Lane, Hamilton, Bermuda, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql a Bermudan joint stock company incorporated for an \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql unlimited duration by private act of the Bermuda Legislature \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (FIL) and an investment adviser to various investment \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql companies (the "International Funds") and certain institutional \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql investors, as a beneficial owner of the 6,300 shares or 0.005% \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of the Common Stock outstanding of Pioneer Natural \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Resources Company. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Prior to June 30, 1980, FIL was a majority-owned \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql subsidiary of Fidelity Management & Research Company \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql (Fidelity), a wholly-owned subsidiary of FMR Corp. On that \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql date, the shares of FIL held by Fidelity were distributed, as a \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql dividend, to the shareholders of FMR Corp. FIL currently \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql operates as an entity independent of FMR Corp. and Fidelity. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql The International Funds and FIL's other clients, with the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql exception of Fidelity and an affiliated company of Fidelity, are \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql non-U.S. entities. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql A partnership controlled by Edward C. Johnson 3d and \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql members of his family owns shares of FIL voting stock with \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the right to cast approximately 39.89% of the total votes which \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql may be cast by all holders of FIL voting stock. Mr. Johnson \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 3d is Chairman of FMR Corp. and FIL. FMR Corp. and FIL \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql are separate and independent corporate entities, and their \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Boards of Directors are generally composed of different \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql individuals. Other than when one serves as a sub adviser to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the other, their investment decisions are made independently, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql and their clients are generally different organizations. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FMR Corp. and FIL are of the view that they are not \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql acting as a "group" for purposes of Section 13(d) under the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Securities Exchange Act of 1934 (the "1934" Act) and that \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql they are not otherwise required to attribute to each other the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql "beneficial ownership" of securities "beneficially owned" by \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the other corporation within the meaning of Rule 13d-3 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql promulgated under the 1934 Act. Therefore, they are of the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql view that the shares held by the other corporation need not be \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql aggregated for purposes of Section 13(d). However, FMR \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Corp. is making this filing on a voluntary basis as if all of the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql shares are beneficially owned by FMR Corp. and FIL on a \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql joint basis. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FIL may continue to have the International Funds or \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql other accounts purchase shares subject to a number of factors, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql including, among others, the availability of shares for sale at \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql what FIL considers to be reasonable prices and other \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql investment opportunities that may be available to the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql International Funds. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FIL intends to review continuously the equity position \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of the International Funds and other accounts in the Company. \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Depending upon its future evaluations of the business and \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql prospects of the Company and upon other developments, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql including, but not limited to, general economic and business \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql conditions and money market and stock market conditions, \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FIL may determine to cease making additional purchases of \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql shares or to increase or decrease the equity interest in the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Company by acquiring additional shares, or by disposing of all \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql or a portion of the shares. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FIL does not have a present plan or proposal which \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql relates to or would result in (i) an extraordinary corporate \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql transaction, such as a merger, reorganization, liquidation, or \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql sale or transfer of a material amount of assets involving the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Company or any of its subsidiaries, (ii) any change in the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Company's present Board of Directors or management, (iii) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql any material changes in the Company's present capitalization \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql or dividend policy or any other material change in the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Company's business or corporate structure, (iv) any change in \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql the Company's charter or by-laws, or (v) the Company's \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql common stock becoming eligible for termination of its \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql registration pursuant to Section 12(g)(4) of the 1934 Act. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FIL has sole power to vote and the sole power to \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql dispose of 6,300 shares. \par\pard\plain\fs16 \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql SCHEDULE 13G - TO BE INCLUDED IN \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql STATEMENTS \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FILED PURSUANT TO RULE 13d-1(b) or 13d-2(b) \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql RULE 13d-1(f)(1) AGREEMENT \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql The undersigned persons, on October 12, 2004, agree \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql and consent to the joint filing on their behalf of this Schedule \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql 13G in connection with their beneficial ownership of the \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Common Stock of Pioneer Natural Resources Company at \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql September 30, 2004. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql FMR Corp. \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By /s/ Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Duly authorized under Power of Attorney \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql dated December 30, 1997, by and on behalf \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of FMR Corp. and its direct and indirect \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql subsidiaries \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Edward C. Johnson 3d \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By /s/ Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Duly authorized under Power of Attorney \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql dated December 30, 1997, by and on behalf \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of Edward C. Johnson 3d \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Abigail P. Johnson \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By /s/ Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Duly authorized under Power of Attorney \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql dated December 30, 1997, by and on behalf \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql of Abigail P. Johnson \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Fidelity Management & Research Company \par\pard\plain\fs16 \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql By /s/ Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Eric D. Roiter \par\pard\plain\fs16\pard\plain\cf1\f50\fs16\ql Senior V.P. and General Counsel \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}