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): May 25, 2006

                            ------------------------

                        PIONEER NATURAL RESOURCES COMPANY
             (Exact name of registrant as specified in its charter)


           Delaware                        1-13245                75-2702753
       (State or other            (Commission File Number)     (I.R.S. Employer
jurisdiction of incorporation)                                  Identification
                                                                    Number)

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


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

                                 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))







Item 7.01. Regulation FD Disclosure.

     Pioneer Natural  Resources Company (the "Company") filed as exhibits to its
Form 10-K for the year ended December 31, 2005 the certifications required under
section 302 of the  Sarbanes-Oxley  Act of 2002.  Pursuant to the New York Stock
Exchange ("NYSE") Listed Company Manual,  the foregoing  disclosure was required
to be made in the Company's annual report to shareholders but was  inadvertently
omitted.  This  filing is being made at the  request of the NYSE to remedy  such
omission.










                                    SIGNATURE

     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



                                   /s/ Darin G. Holderness
                                   -------------------------------------------
                                   Darin G. Holderness
                                   Vice President and Chief Accounting Officer


Dated: May 25, 2006