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): December 9, 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 1.01.  Entry into a Material Definitive Agreement................    3

Item 9.01.  Financial Statements and Exhibits.........................    4

            (d)   Exhibits............................................    4

Signature.............................................................    5

Exhibit Index.........................................................    6




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                        PIONEER NATURAL RESOURCES COMPANY



Item 1.01.    Entry into a Material Definitive Agreement

     Amended and Restated  Employee  Stock  Purchase  Plan. On December 9, 2005,
Pioneer  Natural  Resources  Company  (the  "Company")  executed  an amended and
restated  Employee  Stock  Purchase  Plan  (the  "ESPP")  to  incorporate  prior
amendments to the ESPP and make certain other changes to the Plan, including the
shortening of the offering  period from nine months to eight months.  The number
of shares of the  Company's  common  stock that are  subject to the ESPP and the
ESPP termination date were unchanged by its amendment and restatement.

     The ESPP allows  eligible  employees  to annually  purchase  the  Company's
common stock at a discounted price. Officers of the Company and its subsidiaries
are not  eligible  to  participate  in the ESPP.  Contributions  to the ESPP are
limited to 15 percent of an  employee's  pay  (subject to certain  ESPP  limits)
during the eight-month  offering  period.  Participants in the ESPP purchase the
Company's common stock at a price that is 15 percent below the fair market value
(as defined in the ESPP) of the  Company's  common stock on either the first day
or the  last  day of each  offering  period,  whichever  is  lower.  The ESPP is
intended to qualify as an employee  stock  purchase plan under the provisions of
section 423 of the Internal Revenue Code.

     The  description  of the ESPP set forth in this report is  qualified in its
entirety by reference to the ESPP  document  that is filed as an exhibit to this
report and that is incorporated herein by reference.

     Severance  Agreement  with  William F. Hannes.  On December  12, 2005,  the
Company entered into a severance agreement with William F. Hannes, the Company's
recently elected Executive Vice President,  Worldwide Business Development.  The
Company may terminate the severance  agreement  annually beginning at the end of
the initial  term on  September  30,  2007,  but the  severance  agreement  will
continue  following a potential change in control that occurs during the term of
the agreement. In any event, the severance agreement terminates upon a change in
control  of the  Company.  Mr.  Hannes  is also a party to a change  in  control
agreement  executed prior to his election as an executive  officer,  which is in
the same form as that currently in force with other Executive Vice Presidents of
the Company.

     The  severance  agreement  provides  that,  if  the  executive   terminates
employment  for good reason or if the Company  terminates  the employment of the
executive officer other than for cause, death,  disability or normal retirement,
the Company must pay the executive  officer a separation  payment in addition to
earned salary and vested benefits.  The separation payment is an amount equal to
the sum of (1) one times the executive  officer's base salary,  (2) 18 times the
monthly  executive  officer's  cost of coverage  for  himself  and his  eligible
dependents  under the Company's group medical plans,  and (3) one-twelfth of the
executive  officer's base salary if the date of termination is less than 30 days
following the notice of termination  and the executive  officer's  employment is
terminated   by   the   Company.   The   severance   agreement   also   contains
non-solicitation and non-interference covenants by the executive in favor of the
Company.

     Good reason for an executive to terminate  employment  generally includes a
demotion or significant  pay reduction.  Definitions of "good reason,"  "cause,"
"potential  change in control," "change in control" and certain other terms used
in this  report  are set forth in the form of  Severance  Agreement  filed as an
exhibit to this report. The description of the severance  agreement set forth in
this report is qualified in its entirety by reference to the severance agreement
that is filed as an exhibit to this  report and that is  incorporated  herein by
reference.



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                        PIONEER NATURAL RESOURCES COMPANY


Item 9.01. Financial Statements and Exhibits

       (d) Exhibits

          10.1  Pioneer Natural Resources Company Employee Stock Purchase Plan,
                as amended and restated effective December 9, 2005.

          10.2  Severance Agreement dated December 12, 2005, between the Company
                and William F. Hannes.




                                        4





                       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: December 14, 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

  10.1(a)            Pioneer Natural  Resources Company  Employee Stock Purchase
                     Plan, as amended and restated effective December 9, 2005.
  10.2(a)            Severance  Agreement dated  December 12, 2005,  between the
                     Company and William F. Hannes.


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






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