As filed with the Securities and Exchange Commission on June 27, 2003


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                    FORM 11-K

              / x / ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

                   For the fiscal year ended December 31, 2002

                                       OR

             / / TRANSITION REPORT PURSUANT TO SECTION 15 (D) OF THE
                         SECURITIES EXCHANGE ACT OF 1934

              For the transition period from _________ to _________

                          Commission File No. 333-39249

A. Full title of the plan and the address of the plan, if different from that of
the issuer named below:

          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN


B. Name of issuer of the securities held pursuant to the plan and the address of
its principal executive officer:


                        Pioneer Natural Resources Company
                      5205 North O'Connor Blvd., Suite 1400
                               Irving, Texas 75039







          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN


                 Financial Statements and Supplemental Schedule

    As of December 31, 2002 and 2001 and for the year ended December 31, 2002

                       With Report of Independent Auditor









                                       2







          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN




                                Table of Contents


                                                                          Page


Report of Independent Auditor........................................       4

Statements of Net Assets Available for Benefits as of
   December 31, 2002 and 2001........................................       5

Statement of Changes in Net Assets Available for Benefits
   for the year ended December 31, 2002..............................       6

Notes to Financial Statements........................................       7

Schedule H; Line 4i - Schedule of Assets (Held At End of
   Year) as of December 31, 2002.....................................      12

Signatures...........................................................      13

Index to Exhibits....................................................      14



                                       3












                          Report of Independent Auditor


To the Participants and the Plan Administrator
of Pioneer Natural Resources USA, Inc. 401(k) and Matching Plan:


We have audited the accompanying statements of net assets available for benefits
of Pioneer  Natural  Resources USA, Inc. 401(k) and Matching Plan as of December
31, 2002 and 2001, and the related  statement of changes in net assets available
for benefits for the year ended December 31, 2002.  These  financial  statements
are the  responsibility  of the  Plan's  management.  Our  responsibility  is to
express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with auditing standards generally accepted
in the United States. Those standards require that we plan and perform the audit
to obtain reasonable  assurance about whether the financial  statements are free
of material misstatement. An audit includes examining, on a test basis, evidence
supporting  the amounts and  disclosures in the financial  statements.  An audit
also includes assessing the accounting principles used and significant estimates
made by  management,  as well as  evaluating  the  overall  financial  statement
presentation. We believe that our audits provide a reasonable basis for our
opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all  material  respects,  the net assets  available  for benefits of the Plan at
December  31,  2002 and 2001,  and the changes in its net assets  available  for
benefits for the year ended  December 31, 2002,  in conformity  with  accounting
principles generally accepted in the United States.

Our audits were performed for the purpose of forming an opinion on the financial
statements taken as a whole. The  accompanying  supplemental  schedule of assets
(held at end of year) as of December 31, 2002,  is presented  for the purpose of
additional  analysis and is not a required part of the financial  statements but
is  supplementary  information  required by the  Department of Labor's Rules and
Regulations for Reporting and Disclosure  under the Employee  Retirement  Income
Security Act of 1974. This  supplemental  schedule is the  responsibility of the
Plan's management.  The supplemental schedule has been subjected to the auditing
procedures  applied  in our  audits  of the  financial  statements  and,  in our
opinion,  is fairly stated in all material respects in relation to the financial
statements taken as a whole.



                                                 Ernst & Young LLP


Fort Worth, Texas
May 31, 2003


                                       4









          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN


                 Statements of Net Assets Available for Benefits




                                                                 December 31,
                                                         ---------------------------
                                                             2002           2001
                                                         ------------   ------------

                                                                  
Investments at fair value:
  Vanguard Primecap Fund.............................    $ 18,022,434   $ 17,759,069
  Vanguard Prime Money Market Fund...................      15,269,243     10,618,942
  Vanguard 500 Index Fund............................      10,677,404      8,538,931
  Vanguard Windsor II Fund...........................       9,007,662      7,489,819
  Vanguard - ST Corporate Fund.......................       5,235,030      3,482,011
  Vanguard Total Bond Market Index Fund..............       2,937,616        875,098
  Vanguard International Growth Fund.................       1,308,748        746,402
  Vanguard Asset Allocation Fund.....................       1,189,465        201,309
  Vanguard Explorer Fund.............................         730,228          6,653
  Sarofim Equity Fund................................      13,136,875     11,325,152
  Pioneer Stock Investment Fund .....................       4,768,989      4,199,189
                                                          -----------    -----------
                                                           82,283,694     65,242,575
Participant loans receivable.........................       1,531,468      1,359,059
                                                          -----------    -----------
                                                           83,815,162     66,601,634
Participant contributions receivable.................             -          112,610
Unallocated administrative expenses..................          (9,869)        (9,525)
                                                          -----------    -----------
  Net assets available for benefits..................    $ 83,805,293   $ 66,704,719
                                                          ===========    ===========















                 See accompanying notes to financial statements.

                                       5








          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN


            Statement of Changes in Net Assets Available for Benefits
                      For the year ended December 31, 2002





                                                              
Additions to net assets attributed to:

  Interest and dividend income...............................    $  1,245,290
  Employer contributions.....................................       4,655,443
  Employee contributions.....................................       3,605,428
  Rollovers..................................................          63,097
  Asset transfers associated with merger.....................      24,031,142
                                                                  -----------
     Total additions.........................................      33,600,400
                                                                  -----------
Deductions from net assets attributed to:
  Net depreciation in fair value of investments..............      13,742,681
  Distributions to participants..............................       2,717,494
  Fees.......................................................          39,651
                                                                  -----------
     Total deductions........................................      16,499,826
                                                                  -----------

Net increase.................................................      17,100,574

Net assets available for benefits:
  Beginning of year..........................................      66,704,719
                                                                  -----------
  End of year................................................    $ 83,805,293
                                                                  ===========












                 See accompanying notes to financial statements.

                                       6








          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 2002 and 2001

Note 1.     Description of Plan

       The following  description  of the  Pioneer  Natural Resources USA,  Inc.
401(k)  and  Matching  Plan (the  "Plan")  provides  only  general  information.
Participants  should  refer  to the  Summary  Plan  Description  for a  complete
description of the Plan, a copy of which is available to each  participant  from
the Pioneer Natural  Resources USA, Inc. 401(k) and Matching Plan Committee (the
"Plan  Administrator").  The Plan is subject to the  provisions  of the Employee
Retirement Income Security Act of 1974 ("ERISA").

       Effective January 1, 2002, the Pioneer Natural Resources USA, Inc. 401(k)
Trust was amended to allow the merger  (the  "Merger")  of the  Pioneer  Natural
Resources USA, Inc. Matching Plan (the "Matching Plan") into the Pioneer Natural
Resources USA, Inc. 401(k) Plan (the "401(k) Plan").

       General

       The Plan is a  defined contribution plan  established on January 1,  1990
under Section 401 of the Internal  Revenue Code of 1986, as amended (the "Code")
covering all employees of Pioneer Natural  Resources USA, Inc. (the "Employer"),
a wholly-owned  subsidiary of Pioneer Natural Resources Company (the "Company").
Regular full-time  employees and part-time employees are eligible to participate
in the Plan on the first day of the month following their date of hire. The Plan
assets  are  held  in a  trust  and  certain  administrative  functions  such as
maintenance  of account  balances and  allocation  of earnings are  performed by
Vanguard Fiduciary Trust Company, the trustee of the trust (the "Trustee").

       Contributions

       Participants may  elect to contribute  to the Plan  an amount of not less
than two percent  nor more than 30 percent of their  pre-tax  annual  salary and
bonus.  Additionally,  participants may elect to make after-tax contributions to
the Plan. A participant's  combined  pre-tax and after-tax  contributions to the
Plan  (the  "Participant  Contributions")  may  not  exceed  50  percent  of the
participant's   annual  salary  and  bonus.   Prior  to  the  Merger,   matching
contributions  were made in cash to the Matching  Plan at an amount equal to 200
percent  of the  first  five  percent  of basic  compensation  contributed  by a
participant  to the  Plan  (the  "Matching  Contributions").  Subsequent  to the
Merger,  Matching Contributions are made directly into the Plan. On December 31,
2001,  participant  contributions  amounting to $112,610  were in transit to the
Trustee  and  were  recorded  as  participant  contributions  receivable  in the
accompanying  Statement of Net Assets  Available for Benefits as of December 31,
2001.

       Participant Accounts

       Participants' accounts  are credited with the  Participant Contributions,
the Matching Contributions and an allocation of Plan earnings and administrative
expenses.  Plan  earnings  and  administrative  expenses  are  allocated to each
participant's  accounts by fund in proportion to their fund balance  relative to
the total fund balance.

       Participants may  borrow from their accounts a minimum of  $1,000 up to a
maximum of $50,000 or 50 percent of their accounts' vested  balances,  whichever
amount is less.  The loans  are  secured  by the  balance  in the  participant's
accounts.  Participant  loans bear interest at an annual rate equal to the prime
borrowing rate at the inception of the loan plus one percent. Loan principal and
interest is paid ratably through payroll deductions.

                                       7








          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 2002 and 2001


Note 1.     Description of Plan (continued)

       Investment Options

       During the Plan year ended December 31,  2002,  participants were able to
allocate their contributions among the following  registered  investment company
funds and the Pioneer Stock Investment Fund:

       Registered Investment Company Funds:

       o      Vanguard Primecap Fund -  Invests  in  stocks  of  companies  with
              above-average  prospects for  continued  earnings  growth,  strong
              industry positions and skilled management teams.

       o      Vanguard Prime Money Market Fund -  Invests  in  short-term,  high
              quality money market instruments issued by financial institutions,
              non-financial  corporations,  the  United  States  government  and
              United States federal agencies.

       o      Vanguard 500 Index Fund -  Invests in  all of the  500 stocks that
              make up the  Standard & Poor's  500 Composite Stock Price Index, a
              widely  recognized   benchmark  of   United  States  stock  market
              performance.

       o      Vanguard Windsor  II  Fund  -  Invests  in  large  or  medium size
              companies whose stocks are considered by the fund's advisors to be
              undervalued or out-of-favor.  The stocks generally  sell at prices
              considered by the  fund's advisors to be below  the overall market
              average compared  to  their  dividend  income  and  future  return
              potential.

       o      Vanguard - ST  Corporate  Fund  -  Invests  in  short-term  bonds,
              including  high  quality  corporate  and  United  States  Treasury
              securities.

       o      Vanguard Total Bond Market Index Fund -  Invests in a large sample
              of  securities  that  match  key  characteristics  of  the  Lehman
              Brothers Aggregate Bond Index.

       o      Vanguard  International  Growth  Fund  -   Invests  in  stocks  of
              companies  based  outside the United States.  Stocks  are selected
              from more than 15 countries.

       o      Vanguard  Asset  Allocation  Fund  -  Invests  in  common  stocks,
              long-term U.S. Treasury bonds and money market instruments.

       o      Vanguard Explorer  Fund  -  Invests  in  a  diversified  group  of
              small-company stocks with prospects for above-average growth.

       o      Sarofim Equity Fund -  Invests in a broadly  diversified portfolio
              of large,  high-quality,  multinational companies  with  favorable
              growth prospects  and  high  incremental  returns  on  investment.
              Income is a secondary goal.

       Pioneer Stock Investment Fund -  The  Pioneer  Stock  Investment  Fund is
       designed to  provide long-term growth of capital through increases in the
       value  of the  common  stock of  the  Company.  Dividends,  if  any,  are
       reinvested to purchase more shares.

                                       8









          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 2002 and 2001


Note 1.     Description of Plan (continued)

       Effective January 1, 2003,  the Plan was amended to allow participants to
allocate their  contributions  to the following  registered  investment  company
funds, in addition to the fund options that were available during 2002:

       o      Vanguard Inflation-Protected Securities Fund -  Invests  primarily
              in inflation-indexed bonds issued by the United States government,
              government agencies and corporations. The fund may invest in bonds
              of any maturity.

       o      Vanguard  Retirement  Savings  Trust   -   Invests  in  investment
              contracts  issued  by  insurance companies,  commercial  banks and
              other fixed-principal investments.  The fund attempts to  maintain
              an average  weighted maturity of between two to three years in its
              investments.

       See Note 3 for  additional  information  regarding  investment  risks and
uncertainties.

       Vesting

       As is described  in more  detail in  "Contributions"  above,  Participant
Contributions,  Matching  Contributions and  Plan earnings are maintained in the
Plan.

       Participants are immediately vested  in their  Participant  Contributions
made into the Plan,  plus the actual Plan earnings  thereon.  A  participant  is
fully  vested in the  Matching  Contributions,  plus the  actual  Plan  earnings
thereon,  after four years of continuous  service.  Participant account balances
that were  merged  into the Plan  from  predecessor  plans  retain  the  vesting
schedules provided for in the predecessor plans' documents.

       Payments of Benefits

       If the total value  of the  vested portion  of the  participant's account
exceeds  $5,000,   payments  will  begin at age 70-1/2  unless  the  participant
terminates,  retires or becomes  disabled prior to age 70-1/2 and consents to an
earlier  distribution date by filing a written request to the Plan Administrator
within  90  days  prior  to  the  date  the  participant  wishes  to  receive  a
distribution.  Except for participant accounts that have a total vested value of
$5,000 or less,  distributions to terminated,  retired or disabled  participants
will be annuities,  but may be  installments or lump sum payments if so directed
by the participant,  except that vested amounts that are invested in the Pioneer
Stock Investment Fund may, at the election of the participant, be distributed in
the  form  of the  Company's  common  stock  with  cash  distributed  in lieu of
fractional  shares of stock.  If the total  value of the  vested  portion of the
participant's account is $5,000 or less, payment will be made in one lump sum as
soon as administratively  possible, except that vested amounts that are invested
in the Pioneer Stock Investment Fund may, at the election of the participant, be
distributed in the form of the Company's  common stock with cash  distributed in
lieu of fractional shares of stock. A participant's beneficiary will receive the
participant's account balance in the event of a participant's death.

       Withdrawal of Benefits

       Current employees of the Employer may withdraw  (i) all or a portion  (in
multiples  of 10 percent of whole  dollars  amounts) of their  account  balances
derived from after-tax Participant Contributions or rollover contributions; (ii)
their vested assets in the Plan under certain hardship  conditions as defined in
the Plan agreement; or (iii), if the participant has attained the age of 59-1/2,
all or a portion (in multiples of 10 percent or whole dollars  amounts) of their
account  balances  derived  from  Participant  Contributions  and Plan  earnings
thereon. Terminated participants may withdraw their vested assets in the Plan.

                                       9






          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 2002 and 2001



Note 1.     Description of Plan (continued)

       Plan Termination

       Although it has not  expressed any intent to do so,  the Employer has the
right under the Plan,  subject to the  provisions  of ERISA to  discontinue  its
contributions  at any time or to terminate  the Plan. In the event of the Plan's
termination  or the complete  discontinuance  of Matching  Contributions  to the
Plan, participants will become fully vested in their accounts.

Note 2.     Summary of Significant Accounting Policies

       Basis of Presentation

       The  accompanying  financial  statements  have been  prepared  under  the
accrual basis of accounting in accordance  with  generally  accepted  accounting
principles in the United States ("GAAP").

       The  accompanying  Statement  of  Changes in  Net  Assets  Available  for
Benefits for the year ended  December 31, 2002 includes  additions to net assets
of the Plan of $24,031,142 attributable to assets of the Matching Plan that were
transferred  to the Plan as a result of the  Merger  effective  January 1, 2002.
Accordingly,  the accompanying Statement of Net Assets Available for Benefits of
the Plan as of December  31, 2001 is that of the 401(k) Plan.  Benefit  payments
made to participants are recorded upon distribution.

       Investment Valuation

       Investments  are  valued at  fair  value  as  determined  by the Trustee.
Investment fair values are determined as follows:

       1.    Investments in registered investment company funds are valued using
             published market prices which represent the fair value of shares or
             units held by the Plan as of December 31.

       2.    Investments in the Company's  common stock are  valued at the  last
             reported sales price on December 31.

       3.    Participant  loans receivable  are valued at their unpaid principal
             balance, which approximates fair value.

       Security Transactions and Investment Income

       Security transactions are accounted for on a  trade-date basis.  Expenses
incurred with transactions,  if any, are added to the purchase price or deducted
from the  selling  price at the time of the  transactions.  Dividend  income  is
recorded on the ex-dividend  date.  Income from other investments is recorded as
earned on an accrual basis.

       Use of Estimates

       The preparation of financial statements in  conformity with GAAP requires
the Plan's  management to make estimates that affect the amounts reported in the
financial  statements and accompanying  notes.  Actual results could differ from
those estimates.

                                       10








          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN

                          NOTES TO FINANCIAL STATEMENTS
                           December 31, 2002 and 2001


Note 3.     Investments

       The Trustee  holds the  Plan's  investments and  executes all  investment
transactions.  All investment  information disclosed in the financial statements
and the accompanying  schedule,  including investments held at December 31, 2002
and 2001,  interest and dividend  income,  and net depreciation in fair value of
investments  for the year ended  December 31, 2002, was obtained or derived from
information  supplied to the Plan  Administrator  and  certified as complete and
accurate by the Trustee.

       During 2002,  the total fair value of the Plan's  investments  (including
investments purchased, sold and held during the year) depreciated as follows:


                                                           
           Depreciation of Registered Investment Company
              Funds fair values                               $  14,895,161
           Appreciation of Pioneer Stock Investment Fund
              fair value                                         (1,152,480)
                                                                -----------
                  Net depreciation of fair values             $  13,742,681
                                                               ============


       The fair values  of the  Plan's  investments are  subject to  a number of
risks and  uncertainties.  These risks and  uncertainties  include,  among other
things,  interest rate risk, credit risk, political risk, general business risks
and overall market  volatility risk. As described in Note 1,  participants  have
investment  options to which they may allocate their  contributions  and account
balances. Those investment options have individual risk profiles that cause them
to  respond  differently  to changes  in the risks and  uncertainties  described
above.  Due to the level of risk associated with the Plan's  investments,  it is
reasonably  possible that changes in the fair values of the Plan investments may
occur during the year ended December 31, 2003, and that such changes could cause
the Plan's future net assets  available for benefits to differ  materially  from
those reported as of December 31, 2002.

Note 4.     Administrative Expenses

       Administrative expenses incurred by the Plan were $39,651 during the year
ended December 31, 2002. The Employer may pay certain  expenses  incurred in the
establishment and administration of the Plan, including expenses and fees of the
Trustee,  but is not  obligated  to do so.  Any  Plan  expenses  not paid by the
Employer  are  paid  from  the  Plan's  earnings  or  from  qualifying   account
forfeitures.  In  addition to  administrative  expenses  paid by the Plan,  Plan
administrative expenses of $3,966 were paid by the Employer during 2002. Account
forfeiture   balances  in  the  Plan  qualifying  to  be  used  to  defray  Plan
administrative  expense  totaled $15,640 and $28,566 as of December 31, 2002 and
2001, respectively.

Note 5.     Tax Status of the Plan

       The Plan  received a  determination  letter  from  the  Internal  Revenue
Service dated March 19, 2003,  stating that the Plan is qualified under Sections
401(a) and 501(a) of the Code and,  therefore,  the related trust is exempt from
taxation.  The  Plan is  required  to  operate  in  conformity  with the Code to
maintain its qualification.  The Plan  Administrator  believes the Plan is being
operated  in  compliance  with the  applicable  requirements  of the  Code  and,
therefore,  believes  that the Plan is  qualified  and the related  trust is tax
exempt.

Note 6.     Related Party Transactions

       Certain Plan investments  are in shares or units of registered investment
company funds that are managed by the Trustee and the Pioneer  Stock  Investment
Fund. Plan transactions in registered  investment company funds that are managed
by  the   Trustee   and  the   Pioneer   Stock   Investment   Fund   qualify  as
party-in-interest transactions.

                                       11










          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN


         Schedule H; Line 4i - Schedule of Assets (Held At End of Year)
                                 EIN: 75-2516853
                                Plan Number: 001

                             As of December 31, 2002


                                                                  (c)
                                                             Description of
                          (b)                             investment including
                  Identity of issuer,                     maturity date, rate of                  (e)
                   borrower, lessor,                     interest, collateral, par               Current
 (a)               or similar party                         or maturity value                     Value
-----      --------------------------------          --------------------------------------    ------------
                                                                                      
  *        Vanguard Fiduciary Trust Company          Vanguard Primecap Fund -
                                                       466,178 shares                          $ 18,022,434
  *        Vanguard Fiduciary Trust Company          Vanguard Prime Money Market Fund -
                                                       15,269,243 shares                         15,269,243
  *        Vanguard Fiduciary Trust Company          Vanguard 500 Index Fund -
                                                       131,576 shares                            10,677,404
  *        Vanguard Fiduciary Trust Company          Vanguard Windsor II Fund -
                                                       433,061 shares                             9,007,662
  *        Vanguard Fiduciary Trust Company          Vanguard - ST Corporate Fund -
                                                       485,174 shares                             5,235,030
  *        Vanguard Fiduciary Trust Company          Vanguard Total Bond Market Index Fund -
                                                        283,007 shares                            2,937,616
  *        Vanguard Fiduciary Trust Company          Vanguard International Growth
                                                       Fund - 107,627 shares                      1,308,748
  *        Vanguard Fiduciary Trust Company          Vanguard Asset Allocation Fund  -
                                                        65,825 shares                             1,189,465
  *        Vanguard Fiduciary Trust Company          Vanguard Explorer Fund - 16,053 shares         730,228
  *        Fayez Sarofim & Co.                       Sarofim Equity Fund - 330,072 shares        13,136,875
  *        Pioneer Natural Resources Company         Pioneer Stock Investment Fund -
                                                       524,065 units                              4,768,989
  *        Participant loans receivable              Interest rates range from 5.75% to 10.5%     1,531,468
                                                                                                -----------
                                                                                               $ 83,815,162
                                                                                                ===========

--------------------------
*Party in-interest

Note: Column (d) is not applicable since all investments are participant directed.



                                       12












          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN

                               S I G N A T U R E S


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

                                   PIONEER NATURAL RESOURCES USA, INC.
                                   401(k) AND MATCHING PLAN

                                   By:  Pioneer Natural Resources USA, Inc.
                                        401(k) and Matching Plan Committee


Date:    June 27, 2003          By:    /s/ Larry N. Paulsen
                                      ----------------------------------------
                                      Larry N. Paulsen
                                      Chairman


Date:    June 27, 2003          By:    /s/ Richard P. Dealy
                                      ----------------------------------------
                                      Richard P. Dealy


Date:    June 27, 2003          By:    /s/ Kerry D.  Scott
                                      ----------------------------------------
                                      Kerry D.  Scott


Date:    June 27, 2003          By:    /s/ Kevin Schepel
                                      ----------------------------------------
                                      Kevin Schepel


Date:    June 27, 2003          By:    /s/ David W. Simpson
                                      ----------------------------------------
                                      David W. Simpson


Date:    June 27, 2003          By:    /s/ Susan A. Spratlen
                                      ----------------------------------------
                                      Susan A. Spratlen


                                       13










          PIONEER NATURAL RESOURCES USA, INC. 401(k) AND MATCHING PLAN

                                INDEX TO EXHIBITS





Exhibit
Number                           Description                             Page
-------                          -----------                             ----

                                                                   
  23.1            Consent of Independent Auditors                         15
  99.1            Chief Executive Officer Certification under
                    Section 906 of Sarbanes-Oxley Act of 2002             16
  99.2            Chief Financial Officer Certification under
                    Section 906 of Sarbanes-Oxley Act of 2002             17



                                       14