ࡱ> TU l \pThe Free Software Foundation B=PF0*8X@"1 Helvetica1Courier1 Courier New1 Courier New1 Helvetica$#,##0_);($#,##0)$#,##0_);[Red]($#,##0)$#,##0.00_);($#,##0.00)$#,##0.00_);[Red]($#,##0.00)-**_($* #,##0_);_($* (#,##0);_($* "-"_);_(@_)*)'_(* #,##0_);_(* (#,##0);_(* "-"_);_(@_)5,2_($* #,##0.00_);_($* (#,##0.00);_($* "-"??_);_(@_)2+/_(* #,##0.00_);_(* (#,##0.00);_(* "-"??_);_(@_)2$#,##0.00;[Red]$#,##0.003$#,##0.00;[Red]($#,##0.00)4$#,##0;[Red]($#,##00)50.00%;[Red](0.00%)6 0%;[Red](0%)7#,##0.00;[Red](#,##0.00)8#,##0;[Red](#,##0)                + ) , *   Ј ~~ ؈ ~~#؈ ~~"؈ ~~7#܈ ~~ ؈ ~~8#܈ ~~83ffff̙̙3f3fff3f3f33333f33&nCHECK THE APPROPRIATE BOX TO DE&CHECK THE APPROPRIATE BOX T (1)&ECHECK THE APPROPRIATE BOX T (2)&t'CHECK THE APPROPRIATE BOX T (3)&2CHECK THE APPROPRIATE BOX T (4)&D<CHECK THE APPROPRIATE BOX T (5)&FCHECK THE APPROPRIATE BOX T (6)&QCHECK THE APPROPRIATE BOX T (7)&[CHECK THE APPROPRIATE BOX T (8)&CHECK THE APPROPRIATE BOX T (9) l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } $4} $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~  " NAMES OF REPORTING PERSONS    3 +I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS   (ENTITIES ONLY)   ( Highfields Capital Management LP~  0(CHECK THE APPROPRIATE BOX IF A MEMBER OF"A GROUP (SEE INSTRUCTIONS)(a) ?(b) ?~  SEC USE ONLY~ ,$CITIZENSHIP OR PLACE OF ORGANIZATIONDelaware$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8=1%65[7]=PF0*8X> @ l   dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } 7} $ } $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~ & . &AGGREGATE AMOUNT BENEFICIALLY OWNED BY     EACH REPORTING PERSON     ~ "=~ *0(CHECK BOX IF THE AGGREGATE AMOUNT IN ROW ?6.(9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)~ ..&PERCENT OF CLASS REPRESENTED BY AMOUNTIN ROW 9 6.4%~ 23+TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:]=1%y@%yM)tP(=PF0*8X> @ l  & dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } $4} $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~  " NAMES OF REPORTING PERSONS    3 +I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS   (ENTITIES ONLY)   Highfields GP LLC~  0(CHECK THE APPROPRIATE BOX IF A MEMBER OF"A GROUP (SEE INSTRUCTIONS)(a) ?(b) ?~  SEC USE ONLY~ ,$CITIZENSHIP OR PLACE OF ORGANIZATIONDelaware$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8=1%6DjFl=PF0*8X> @ l  v1 dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } 7} $ } $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~ & . &AGGREGATE AMOUNT BENEFICIALLY OWNED BY     EACH REPORTING PERSON     ~ "=~ *0(CHECK BOX IF THE AGGREGATE AMOUNT IN ROW ?6.(9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)~ ..&PERCENT OF CLASS REPRESENTED BY AMOUNTIN ROW 9 6.4%~ 23+TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:]=1%y@%yM)tP(=PF0*8X> @ l  ; dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } $4} $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~  " NAMES OF REPORTING PERSONS    3 +I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS   (ENTITIES ONLY)   Jonathon S. Jacobson~  0(CHECK THE APPROPRIATE BOX IF A MEMBER OF"A GROUP (SEE INSTRUCTIONS)(a) ?(b) ?~  SEC USE ONLY~ ,$CITIZENSHIP OR PLACE OF ORGANIZATIONUnited States$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8=1%6AgCd=PF0*8X> @ l  FF dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } 7} $ } $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~ & . &AGGREGATE AMOUNT BENEFICIALLY OWNED BY     EACH REPORTING PERSON     ~ "=~ *0(CHECK BOX IF THE AGGREGATE AMOUNT IN ROW ?6.(9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)~ ..&PERCENT OF CLASS REPRESENTED BY AMOUNTIN ROW 9 6.4%~ 23+TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:]=1%y@%yM)tP(=PF0*8X> @ l  }P dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } $4} $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~  " NAMES OF REPORTING PERSONS    3 +I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS   (ENTITIES ONLY)   Richard L. Grubman~  0(CHECK THE APPROPRIATE BOX IF A MEMBER OF"A GROUP (SEE INSTRUCTIONS)(a) ?(b) ?~  SEC USE ONLY~ ,$CITIZENSHIP OR PLACE OF ORGANIZATIONUnited States$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/8 =1%6CiEf=PF0*8X> @ l  [ dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (8)!CHECK THE APPROPRIATE BOX T (9)U } } $ } 7} $ } $     $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:~ & . &AGGREGATE AMOUNT BENEFICIALLY OWNED BY     EACH REPORTING PERSON     ~ "=~ *0(CHECK BOX IF THE AGGREGATE AMOUNT IN ROW ?6.(9) EXCLUDES CERTAIN SHARES (SEE INSTRUCTIONS)~ ..&PERCENT OF CLASS REPRESENTED BY AMOUNTIN ROW 9 6.4%~ 23+TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/:]=1%y@%yM)tP(=PF0*8X> @ l  Uoj0x dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (9)U } I } $ } }  $ U    $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:     Item 1  (a).  Name of Issuer:             . &Pioneer Natural Resources Company (the      ?Issuer?)  Item 1 (b)./'Address of Issuer?s Principal Executive    Offices:2*5205 N. O?Connor Blvd., Suite 900, Irving, Texas 75039  Item 2 (a).Name of Person Filing:    6.This statement is being filed by the following4,persons with respect to the shares of Common80Stock of the Issuer directly owned by Highfields1)Capital I LP (?Highfields I?), Highfields6.Capital II LP (?Highfields II?) and Highfields1)Capital Ltd. (collectively, the ?Funds?):-%(i) Highfields Capital Management LP,3+a Delaware limited partnership (?HighfieldsD' l=1%}Z?    3 +Capital Management?) and investment manager!!!!!to each of the Funds;"""""####2#*(ii) Highfields GP LLC, a Delaware limited$$$$/$'liability company (?Highfields GP?) and%%%%1%)the General Partner of Highfields Capital&&&&& Management;'''''((((.(&(iii) Jonathon S. Jacobson, a Managing))))$)Member of Highfields GP; and*****++++2+*(iv) Richard L. Grubman, a Managing Member,,,,,of Highfields GP.-----....1.)Highfields Capital Management, Highfields////6/.GP, Mr. Jacobson and Mr. Grubman are sometimes000070/individually referred to herein as a ?Reporting111121*Person? and collectively as the ?Reporting22222 Persons.?3333 3 4Item 24 4(b).404(Address of Principal Business Office or,4 4 4 4 55555if None, Residence:66666777727*Address for Highfields Capital Management,88888Highfields GP,9999%9Mr. Jacobson and Mr. Grubman:::::):!c/o Highfields Capital Management;;;;;John Hancock Tower<<<<(< 200 Clarendon Street, 51st Floor====#=Boston, Massachusetts 02116>>>> > ?Item 2? ?(c).?? Citizenship:? ? ? ? DylH C[ev @5TT SS RR OO MMKKIIGGEEDDCCAA??==<<;;::9988775544221100//..,,++))((&&%%$$##!!     l  Y dMbP?_*+%,&٭e2?'٭e2?(٭e2?)٭e2?",D/?? !CHECK THE APPROPRIATE BOX TO DE!CHECK THE APPROPRIATE BOX T (1)!CHECK THE APPROPRIATE BOX T (2)!CHECK THE APPROPRIATE BOX T (3)!CHECK THE APPROPRIATE BOX T (4)!CHECK THE APPROPRIATE BOX T (5)!CHECK THE APPROPRIATE BOX T (6)!CHECK THE APPROPRIATE BOX T (7)!CHECK THE APPROPRIATE BOX T (8)U } y } $ } } $ } } $ } y<}  $ Y                                 $PIONEER NATURAL RESOURCES COSC 13G/A 02/14/2005aYCHECK THE APPROPRIATE BOX TO DESIGNATE THE RULE PURSUANT TO WHICH THIS SCHEDULE IS FILED:       Item 4.   Ownership.          3 +Provide the following information regarding    .&the aggregate number and percentage of80the class of securities of the issuer identified in Item 1. 5-For Highfields Capital Management, Highfields  )!GP, Mr. Jacobson and Mr. Grubman:  (a),$Amount beneficially owned: 9,390,211  shares of Common Stock  (b)Percent of class: 6.4%    (c)0(Number of shares as to which such person   has:  (i)1)Sole power to vote or to direct the vote:  ~ "=  (ii)3+Shared power to vote or to direct the vote:  D/ l=1%eQUSn2qRL ! " # $ % & ' ( ) * + , - . / 0 1 2 3 4 5 6 7 8 9 : ; < = > ?        ?0?!!!!!! """""(iii)":"2Sole power to dispose or to direct the disposition""" " #######of: 9,390,211$$$$$$ %%%% %(iv)%0%(Shared power to dispose or to direct the%%% % &&&&&&&disposition of: ?0?''' (Item 5.(5(-Ownership of Five Percent or Less of a Class.( ( )))***+++Not applicable.,,,, -Item 6.-5--Ownership of More than Five Percent on Behalf--- - ...of Another Person.///0030+The shares beneficially owned by Highfields11.1&Capital Management, Highfields GP, Mr.2212)Jacobson and Mr. Grubman are beneficially3313)owned by the Funds. Each of Highfields I,4414)Highfields II and Highfields Capital Ltd.5545,individually own less than 5% of the shares.66,6$Highfields Capital Management serves7707(as the investment manager to each of the8858-Funds. Each of Highfields Capital Management,9939+Highfields GP, Mr. Jacobson and Mr. Grubman::2:*has the power to direct the dividends from;;1;)or the proceeds of the sale of the shares<<<owned by the Funds.==>Item 7.>,>$Identification and Classification of??2?*the Subsidiary Which Acquired the SecurityDF laEMR. v,Eas&@ A B C D E F G H I J K L M N O P Q R S T U V W X @@/@'Being Reported on by the Parent HoldingAAACompany.BBBCCCNot applicable.DDDD EItem 8.E,E$Identification and Classification ofEEE E FFFMembers of the Group.GGGHHHNot applicable.IIII JItem 9.J'JNotice of Dissolution of Group.JJJ J KKKLLLNot applicable.MMMM NItem 10.NNCertification.NNN N OOOPP4P,By signing below I certify that, to the best$Q____________________________1R)Created by Morningstar Document Research.0S(http://documentresearch.morningstar.com/TT5T-effect of changing or influencing the controlUU0U(of the issuer of the securities and wereVV3V+not acquired and are not held in connectionWW3W+with or as a participant in any transactionXX&Xhaving that purpose or effect.6e2J&I%X4Sg=PF0*8X> @1XXWWVVUUTTSS RR QQ PPNNLLJJHHFFEECC AA @@ ?? >> <<;;::99887766554433221100..--++((   Root Entry FBook    !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRS