UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT
     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported): June 1, 2005




                        Pioneer Natural Resources Company
             ------------------------------------------------------
             (Exact name of Registrant as specified in its charter)



          Delaware                    1-13245               75-2702753
----------------------------        ------------        -------------------
(State or other jurisdiction        (Commission          (I.R.S. Employer
      of incorporation)             File Number)        Identification No.)



5205 N. O'Connor Blvd., Suite 900, Irving, Texas              75039
------------------------------------------------            ----------
   (Address of principal executive offices)                 (Zip Code)


                                 (972) 444-9001
              ----------------------------------------------------
              (Registrant's telephone number, including area code)



                                 Not applicable
          -------------------------------------------------------------
          (Former name or former address, if changed since last report)


Check  the  appropriate  box  below  if the  Form  8-K  filing  is  intended  to
simultaneously  satisfy the filing obligation of the registrant under any of the
following provisions:

| | Written communications pursuant to Rule 425 under the Securities Act (17 CFR
    230.425)
| | Soliciting  material pursuant  to Rule 14a-12 under the Exchange Act (17 CFR
    240.14a-12)
| | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange
    Act (17 CFR 240.14d-2(b))
| | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange
    Act (17 CFR 240.13e-4(c))








                        PIONEER NATURAL RESOURCES COMPANY

                                TABLE OF CONTENTS


                                                                   Page

Item 7.01.  Regulation FD Disclosure...........................      3

Item 9.01.  Financial Statements and Exhibits

            (c)   Exhibits.....................................      3

Signature......................................................      4

Exhibit Index..................................................      5




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                        PIONEER NATURAL RESOURCES COMPANY


Item 7.01.   Regulation FD Disclosure

     On June 1, 2005, Pioneer Natural Resources Company (the "Company") issued a
news release that is attached  hereto as exhibit 99.1. In the news release,  the
Company announced that its Canadian subsidiary has closed the sale of its Martin
Creek,  Conroy Black and Lookout Butte oil and gas properties for proceeds after
closing  adjustments of approximately  $199 million.  The Company also announced
that it expects to  recognize  an after-tax  gain  associated  with the Canadian
asset sale of  approximately  $75 million to $80 million  based on its intent to
create a  repatriation  plan that  qualifies for the  provisions of the American
Jobs Creation Act of 2004.

     In  accordance  with the  provisions  of Statement of Financial  Accounting
Standards  No. 144,  "Accounting  for the  Impairment  or Disposal of Long-Lived
Assets,"  the  Company  will report the results of  operations  of the  Canadian
properties sold, including the gain on disposition,  as discontinued  operations
in its second quarter results.

Item 9.01.   Financial Statements and Exhibits

       (c)   Exhibits

             99.1   News Release dated June 1, 2005.




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                        PIONEER NATURAL RESOURCES COMPANY

                                S I G N A T U R E

Pursuant  to the  requirements  of the  Securities  Exchange  Act of  1934,  the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                               PIONEER NATURAL RESOURCES COMPANY




Date:  June 2, 2005            By:     /s/ Darin G. Holderness
                                     -------------------------------------------
                                     Darin G. Holderness
                                     Vice President and Chief Accounting Officer





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                        PIONEER NATURAL RESOURCES COMPANY

                                  EXHIBIT INDEX


Exhibit No.             Description
-----------             -----------

   99.1(a)              News Release dated June 1, 2005.



-------------
(a) filed herewith





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