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SOLE VOTING POWER6. SHARED VOTING POWER7. SOLE DISPOSITIVE POWER8. SHARED DISPOSITIVE POWERIAGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 5,756,320FCHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES [ ]:PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 3.38%"TYPE OF REPORTING PERSON HC;NAMES OF REPORTING PERSONS Wellington Group Holdings LLP0CITIZENSHIP OR PLACE OF ORGANIZATION DelawareINAMES OF REPORTING PERSONS Wellington Investment Advisors Holdings LLPItem 1.(a)1Name of Issuer Pioneer Natural Resources Company(b){Address of Issuer's Principal Executive Offices 200 Williams Square West 5205 North Oconnor Boulevard Irving, TX 75039Item 2.›Name of Person Filing Wellington Management Group LLP Wellington Group Holdings LLP Wellington Investment Advisors Holdings LLP‹Address of Principal Business Office or, if None, Residence c/o Wellington Management Company LLP 280 Congress Street Boston, MA 02210(c)КCitizenship Wellington Management Group LLP - Massachusetts Wellington Group Holdings LLP - Delaware Wellington Investment Advisors Holdings LLP - Delaware(d)*Title of Class of Securities Common Stock(e)CUSIP Number 723787107Item 3.oIf This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:HBroker or dealer registered under Section 15 of the Act (15 U.S.C. 78o).>Bank as defined in Section 3(a)(6) of the Act (15 U.S.C. 78c).LInsurance Company as defined in Section 3(a)(19) of the Act (15 U.S.C. 78c).fInvestment Company registered under Section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).EAn investment adviser in accordance with Rule 240.13d-1(b)(1)(ii)(E);(f)ZAn employee benefit plan or endowment fund in accordance with Rule 240.13d-1(b)(1)(ii)(F);(g)ZA parent holding company or control person in accordance with Rule 240.13d-1(b)(1)(ii)(G);(h)gA savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);(i)›A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);(j)6Group, in accordance with Rule 240.13d-1(b)(1)(ii)(J).HIf this statement is filed pursuant to Rule 13d-1(c), check this box [ ]Item 4. Ownership.ŽProvide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.Amount Beneficially Owned:8See the responses to Item 9 on the attached cover pages.Percent of Class:9See the responses to Item 11 on the attached cover pages.-Number of shares as to which such person has:(sole power to vote or to direct the vote(ii)*shared power to vote or to direct the vote8See the responses to Item 6 on the attached cover pages.(iii)5sole power to dispose or to direct the disposition of(iv)7shared power to dispose or to direct the disposition of8See the responses to Item 8 on the attached cover pages.Item 5.+Ownership of Five Percent or Less of Class.иIf this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following: [X]Item 6.@Ownership of More than Five Percent on Behalf of Another Person.9The securities as to which this Schedule is filed are owned of record by clients of one or more investment advisers identified in Exhibit A directly or indirectly owned by Wellington Management Group LLP. Those clients have the right to receive, or the power to direct the receipt of, dividends from, or the proceeds from the sale of, such securities. No such client is known to have such right or power with respect to more than five percent of this class of securities, except as follows: Not Applicable.Item 7.€Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company.See attached Exhibit A.Item 8.MIdentification and Classification of Members of the Group. Not Applicable.Item 9.2Notice of Dissolution of Group. Not Applicable.Item 10.ЯCertification. By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.$By: Wellington Management Group LLPBy: /s/ Silvestre A. FontesName: Silvestre A. FontesTitle: Authorized Signor*Date: February 14, 2018!By: Wellington Group Holdings LLPBy: /s/ Silvestre A. FontesName: Silvestre A. FontesTitle: Authorized Signor/By: Wellington Investment Advisors Holdings LLPуPursuant to the instructions in Item 7 of Schedule 13G, the following lists the identity and Item 3 classification of each relevant entity that beneficially owns shares of the security class being reported on this Schedule 13G."Wellington Group Holdings LLP  HC'Wellington Investment Advisors LLP  HC0Wellington Management Global Holdings, Ltd. - HCXOne or more of the following investment advisers (the  Wellington Investment Advisers ):&Wellington Management Company LLP  IA%Wellington Management Canada LLC  IA,Wellington Management Singapore Pte Ltd  IA(Wellington Management Hong Kong Ltd  IA,Wellington Management International Ltd  IA(Wellington Management Japan Pte Ltd  IA,Wellington Management Australia Pty Ltd - IABThe securities as to which this Schedule is filed by Wellington Management Group LLP, as parent holding company of certain holding companies and the Wellington Investment Advisers, are owned of record by clients of the Wellington Investment Advisers. 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