аЯрЁБс>ўџ +ўџџџўџџџ,џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ l ЩсСПРт\pThe Free Software Foundation Bфœ=PF0*8X@"Зк1Д Helvetica1ДCourier1Д Courier New1ДМ Courier New1Д 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)рѕџ Р рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР рѕџ єР р Р р+ѕџ јР р)ѕџ јР р,ѕџ јР р*ѕџ јР р ѕџ јР р аˆ ~~Пр иˆ ~~Пр#иˆ ~~Пр иˆ ~~Пр7#мˆ ~~Пр8#мˆ ~~П“€џ“€џ“€џ“€џ“€џ“€џ’т8џџџџџџџџџџџџ€€€€€€€€€РРР€€€™™џ™3fџџЬЬџџffџ€€fЬЬЬџ€џџџџџџ€€€€€џЬџЬџџЬџЬџџ™™Ьџџ™ЬЬ™џџЬ™3fџ3ЬЬ™ЬџЬџ™џfff™–––3f3™f333™3™3f33™ЧЧЧ…&HSECURITIES AND EXCHANGE COMMISS…&^ SECURITIES AND EXCHANGE COM (1)…&SECURITIES AND EXCHANGE COM (2)… Ж@х l Щ 8Ђq dќЉёвMbP?_*+‚€%џРŒ,Сƒ„&Тй­e2й?'Тй­e2й?(Тй­e2й?)Тй­e2й?Ё",D/р?р?ф!SECURITIES AND EXCHANGE COMMISS!SECURITIES AND EXCHANGE COM (2) SIGNATUREU } У} $ } !} y 8ссссссссс с с с сссссссссссссссссссс'WELLINGTON MANAGEMENT GROUP LLPSC 13G/A 02/12/2015*"SECURITIES AND EXCHANGE COMMISSION~ "NAMES OF REPORTING PERSONS   ' Wellington Management Group LLP~  0 (CHECK THE APPROPRIATE BOX IF A MEMBER OF  A GROUP(a) [ ](b) [ ]~  SEC USE ONLY~ ,$CITIZENSHIP OR PLACE OF ORGANIZATIONMassachusetts.&NUMBER OF SHARES BENEFICIALLY OWNED BY5. SOLE VOTING POWER~ "EACH REPORTING PERSON WITH6. SHARED VOTING POWER~ –џ'!7. SOLE DISPOSITIVE POWER~ #8. SHARED DISPOSITIVE POWER~ Цy~ &.&AGGREGATE AMOUNT BENEFICIALLY OWNED BYEACH REPORTING PERSON~ Цy~ *0(CHECK IF THE AGGREGATE AMOUNT IN ROW (9)EXCLUDES CERTAIN SHARES [ ]зDŸlеџСџЋџŸџqџeџYџMџџџЪўˆўiўQў2ўўэ§Џ§—§r§§Мќqќ$ќфћЗћŸћ…ћCћћ с!с"с#с$с%с&с'с(с)с*с+с,с-с.с/с0с1с2с3с4с5с6с7с~ .. &PERCENT OF CLASS REPRESENTED BY AMOUNT!! IN ROW (9)""##6.97%~ $2 $TYPE OF REPORTING PERSON%%& &IA*'1')*On Effective January 1, 2015, Wellington(-(%Management Company, LLP, a registered)/)'investment advisor, changed its name to*4*,Wellington Management Group LLP (?Wellington+.+&Management Group?) and transferred its,5,-United Stated advisory business to Wellington-2-*Management Company LLP, a Delaware limited.7./liability partnership. On that date, Wellington///'Management Company LLP registered as an050-investment adviser with the SEC by succeeding1911to Wellington Management Group?s SEC registration22(No. 801-15908).34$5____________________________16)Created by Morningstar Document Research.07(http://documentresearch.morningstar.com/з4‡ЬРџžџ†џiџ7џџџУў†ўGўўХ§€§>§їќИќsќ*ќќіћъћТћ=PF0*8X> Ж@х*%776655221100//..--,,++**))((''&&$$##!!     l Щ  ƒ$(5 @pI…J dќЉёвMbP?_*+‚€%џРŒ,Сƒ„&Тй­e2й?'Тй­e2й?(Тй­e2й?)Тй­e2й?Ё",D/р?р?ф!SECURITIES AND EXCHANGE COMMISS!SECURITIES AND EXCHANGE COM (1) SIGNATUREU } I"} †} ч} y<} y ƒссссссссс с с с сссссссссссссссссссс'WELLINGTON MANAGEMENT GROUP LLPSC 13G/A 02/12/2015*"SECURITIES AND EXCHANGE COMMISSION Item 1.  (a) Name of Issuer  ) !Pioneer Natural Resources Company  (b)/ 'Address of Issuer's Principal Executive   Offices 200 Williams Square West$5205 North Oconnor BoulevardIrving, TX 75039# Item 2. (a)Name of Person Filing'Wellington Management Group LLP (b)0(Address of Principal Business Office or,if None, Residence-%c/o Wellington Management Company LLP280 Congress StreetBoston, MA 02210 (c) CitizenshipMassachusetts (d)$Title of Class of Securities Common Stock (e) CUSIP Number€Б’ХAзDQlеџСџЋџŸџqџeџYџMџ,џїўВўdў9ў§§Н§‰§b§&§уќПќpќ:ќёћКћ†ћTћ#ћџњМњŒњ с!с"с#с$с%с&с'с(с)с*с+с,с-с.с/с0с1с2с3с4с5с6с7с8с9с:с;с<с=с>с?с#  Item 3.. &If This Statement is Filed Pursuant to!0!(Rule 13d-1(b), or 13d-2(b) or (c), Check"'"Whether the Person Filing is a:# #(a) #[ ]1#)Broker or dealer registered under Section$$$&$15 of the Act (15 U.S.C. 78o).% %(b) %[ ]1%)Bank as defined in Section 3(a)(6) of the&&&&Act (15 U.S.C. 78c).' '(c) '[ ]/''Insurance Company as defined in Section(((,($3(a)(19) of the Act (15 U.S.C. 78c).) )(d) )[ ]+)#Investment Company registered under***/*'Section 8 of the Investment Company Act+++"+of 1940 (15 U.S.C. 80a-8)., ,(e) ,[X]0,(An investment adviser in accordance with---$-Rule 240.13d-1(b)(1)(ii)(E);. .(f) .[ ]2.*An employee benefit plan or endowment fund///7//in accordance with Rule 240.13d-1(b)(1)(ii)(F);0 0(g) 0[ ]20*A parent holding company or control person11171/in accordance with Rule 240.13d-1(b)(1)(ii)(G);2 2(h) 2[ ]32+A savings association as defined in Section33313)3(b) of the Federal Deposit Insurance Act4444(12 U.S.C. 1813);5 5(i) 5[ ]/5'A church plan that is excluded from the66616)definition of an investment company under77727*Section 3(c)(14) of the Investment Company888&8Act of 1940 (15 U.S.C. 80a-3);9 9(j) 9[ ]>96Group, in accordance with Rule 240.13d-1(b)(1)(ii)(J).::3:+If this statement is filed pursuant to Rule;;$;13d-1(c), check this box [ ]< Item 4.< Ownership.3=+Provide the following information regarding.>&the aggregate number and percentage of8?0the class of securities of the issuer identifiedзDЃ lЇџgџ0џбўƒў$ўр§ƒ§/§жќќ5ќзћ‹ћ+ћЬњlњњЌљSљљЕј\јјДїHїљіЙі‚іKі@сAсBсCсDсEсFсGсHсIсJсKсLсMсNсOсPсQсRсSсTсUсVсWсXсYсZс[с\с]с^с_с@ in Item 1.A A(a)"AAmount Beneficially Owned:B~ BЦyC C(b)CPercent of Class:DD6.97%E E(c)0E(Number of shares as to which such personFF Fhas:G G(i)0G(sole power to vote or to direct the vote~ GH H(ii)2H*shared power to vote or to direct the vote~ H–џ'II(iii):I2sole power to dispose or to direct the disposition~ IJJJ JofK K(iv)0K(shared power to dispose or to direct the~ KЦyLLLLdisposition ofM Item 5.3M+Ownership of Five Percent or Less of Class.N2N*If this statement is being filed to reportO9O1the fact that as of the date hereof the reportingP4P,person has ceased to be the beneficial ownerQ1Q)of more than five percent of the class ofR,R$securities, check the following: [ ]#S Item 6.5S-Ownership of More than Five Percent on BehalfTTof Another Person.U0U(The securities as to which this ScheduleV2V*is filed are owned of record by clients ofW0W(one or more investment advisers directlyX4X,or indirectly owned by Wellington ManagementY/Y'Group LLP, formerly known as WellingtonZ8Z0Management Company, LLP, which was an investment[/['adviser to these clients as of December\1\)31, 2014. Those clients have the right to]3]+receive, or the power to direct the receipt^0^(of, dividends from, or the proceeds from_4_,the sale of, such securities. No such clientзDГ lъџЉџџWџ:џыўУўfўў§k§§Яќwќ5ќьћЈћgћ+ћЫњЁњaњњпљ›љ\љљеј”јQј`сaсbсcсdсeсfсgсhсiсjсkсlсmсnсoсpсqсrсsсtсuсvсwсxсyсzс{с|с}с~сс`1`)is known to have such right or power witha1a)respect to more than five percent of thisb/b'class of securities, except as follows:ccddNot Applicable.#e Item 7.,e$Identification and Classification off2f*the Subsidiary Which Acquired the Securityg/g'Being Reported on by the Parent HoldinghhCompany.iiNot Applicable.#j Item 8.,j$Identification and Classification ofkkMembers of the Group.llmmNot Applicable.#n Item 9.'nNotice of Dissolution of Group.ooppNot Applicable.$q Item 10.qCertification.rrs4s,By signing below I certify that, to the bestt2t*of my knowledge and belief, the securitiesu/u'referred to above were acquired and arev/v'held in the ordinary course of businessw2w*and were not acquired and are not held forx5x-the purpose of or with the effect of changingy0y(or influencing the control of the issuerz/z'of the securities and were not acquired{1{)and are not held in connection with or as|/|'a participant in any transaction having}}that purpose or effect.~зD lПџ~џ?џ'џџЉўgў(ўўс§Š§]§E§§ЬќДќќKќ3ќяћ­ћnћ/ћэњЈњhњ)њшљЉљzљ€сс‚с$€____________________________1)Created by Morningstar Document Research.0‚(http://documentresearch.morningstar.com/з Э(иџ=PF0*8X> Ж@хjm‚‚€€}}||{{zzyyxxwwvvuuttssqqppnnmmkkjjiihhggffeeddbbaa``__^^]]\\[[ZZYYXXWWVVUUTTSSRRQQPPOONNMMFFEEDDCCBBAA@@??>>==<<;;::99887766554433221100//..--,,++**))((''&&%%$$##""!!      l Щ T dќЉёвMbP?_*+‚€%џРŒ,Сƒ„&Тй­e2й?'Тй­e2й?(Тй­e2й?)Тй­e2й?Ё",D/р?р?ф!SECURITIES AND EXCHANGE COMMISS!SECURITIES AND EXCHANGE COM (1)!SECURITIES AND EXCHANGE COM (2)U } $ } 0. ссссссссс с с с сссссссссссс'WELLINGTON MANAGEMENT GROUP LLPSC 13G/A 02/12/2015 SIGNATURE+#By: Wellington Management Group LLP   ! By: /s/ Steven M. Hoffman    Name: Steven M. Hoffman Title: Authorized Person.&Date: February 12, 2015$____________________________1)Created by Morningstar Document Research.0(http://documentresearch.morningstar.com/з4МЬеџСџЋџŸџŠџ~џrџfџ+џџтўЪў›ўƒўSў;ў§§х§Э§С§Е§§=PF0*8X> Ж@х Root Entryџџџџџџџџ РFўџџџBook џџџџџџџџџџџџ  U  !"#$%&'()*ўџџџўџџџ§џџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџ