PIONEER NATURAL RESOURCES CO
11-K, 1999-06-29
CRUDE PETROLEUM & NATURAL GAS
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      As filed with the Securities and Exchange Commission on June 28, 1999


                  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, 1998

                                   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) 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 N. O'Connor Boulevard
                     1400 Williams Square West
                        Irving, Texas 75039

PAGE>

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


          Financial Statements and Supplemental Schedules

      As of and for the years ended December 31, 1998 and 1997

              (With Reports of Independent Auditors)


<PAGE>

                 Report of Independent Auditors

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

We have audited the accompanying  statement of net assets available for benefits
of Pioneer Natural Resources USA, Inc. 401(k) Plan as of December 31, 1998, and
the related statement of changes in net assets available for benefits for the
year then ended.  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 audit in accordance with generally accepted auditing standards.
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 audit provides 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, 1998, and the changes in its net assets available for benefits for
the year then ended in conformity with generally accepted accounting principles.

Our audit was performed for the purpose of forming an opinion on the financial
statements taken as a whole. The accompanying supplemental schedules of assets
held for investment purposes as of December 31, 1998 and reportable transactions
for the year then ended, are presented for the purpose of additional analysis
and are not a required part of the financial statements but are 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.  These supplemental schedules are the responsibility of the Plan's
management.  The Fund Information in the statement of net assets available for
benefits and the changes in net assets available for benefits is presented for
purposes of additional analysis rather than to present the net assets available
for benefits and the changes in net assets  available  for plan benefits of each
fund.  The supplemental schedules and Fund  Information  have been  subjected to
the auditing  procedures applied in our audit of the financial statements and,
in our opinion, are fairly stated in all material respects in relation to the
financial statements taken as a whole.

                                      Ernst & Young LLP

Fort Worth, Texas
May 18, 1999

PAGE>

                         Report of Independent Auditor

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

We have audited the  accompanying  statement of net assets  available for
benefits of Pioneer  Natural  Resources USA, Inc. 401(k) Plan (the "Plan") as
of December  31, 1997,  and the related  statement of changes in net assets
available  for benefits for the year ended December 31, 1997. 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 audit.

We conducted our audit in accordance with generally  accepted  auditing
standards.  These 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 audit provides 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 as
of December  31, 1997,  and the changes in net assets  available  for benefits
for the year ended  December 31, 1997 in conformity with generally accepted
accounting principles.

                                              KPMG LLP


Midland, Texas
June 12, 1998




<PAGE>

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

                 Statements of Net Assets Available for Benefits

                            December 31, 1998 and 1997
<TABLE>

                                                       1998            1997
                                                       ----            ----
<S>                                                <C>             <C>

Investments at fair value:
  VMMR - Prime Portfolio - 9,022,294 shares in
   1998 and 6,920,007 shares in 1997
    (cost approximates fair value)                 $ 9,022,294     $ 6,920,007

  Mutual Funds:
   Vanguard - ST Corporate Fund - 462,563 shares
     in 1998 and 512,013 shares in 1997 (cost
     $4,990,127 and $5,516,188, respectively)        5,014,181       5,536,114
   Vanguard 500 Index Fund - 53,190 shares in 1998
     and 40,837 shares in 1997 (cost $4,443,663 and
     $2,872,952, respectively)                       6,061,044       3,680,362
   Vanguard Primecap Fund - 160,887 shares in 1998
     and 156,311 shares in 1997 (cost $5,432,011
     and $4,845,166, respectively)                   7,667,874       6,188,725
   Vanguard Windsor II Fund - 284,179 shares in
     1998 and 254,464 shares in 1997 (cost
     $7,412,372 and $6,128,990, respectively)        8,482,733       7,286,947
   Vanguard International Growth Fund - 26,813
     shares in 1998 and 22,235 shares in 1997
     (cost $468,142 and $380,071, respectively)        503,275         364,755
   Sarofim Equity Fund - 721,068 shares in 1998 and
     916,548 shares in 1997 cost $28,018,845 and
     $35,277,286, respectively)                     35,779,402      35,727,154
   Pioneer Natural Resources Stock Fund  - 131,265
     shares in 1998 and 94,711 shares in 1997
     (cost $2,776,429 and $2,415,438, respectively)  1,148,565       2,740,713
                                                    ----------      ----------
                                                    73,679,368      68,444,777
                                                    ----------      ----------
Investments at Contract Value:
     Pioneer Natural Resources Stable Value Fund     2,276,593       3,178,713

Participants' loans (unpaid principal balance
  approximates fair value)                           1,657,912       1,538,357
                                                  ------------    ------------
      Net assets available for benefits           $ 77,613,873    $ 73,161,847
                                                  ============    ============
</TABLE>












                 See accompanying notes to financial statements.

PAGE>

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

Statement of Changes in Net Assets Available for Benefits with Fund Information
                     For the year ended December 31, 1998
<TABLE>

                                                                                           Pioneer   Pioneer
                                Vanguard                                 Vanguard           Natural   Natural
                        VMMR-    - ST   Vanguard   Vanguard   Vanguard  Internat.  Sarofim Resources Resources
                       Prime     Corp.  500 Index  Primecap  Windsor II  Growth    Equity   Stable    Stock  Participants'
                     Portfolio   Fund     Fund       Fund       Fund      Fund      Fund  Value Fund  Fund       Loans      Total
                     ---------   ----     ----       ----       ----    ---------   ----  ----------  ----       -----      -----
<S>                   <C>       <C>        <C>      <C>       <C>      <C>       <C>      <C>         <C>       <C>       <C>

Additions to net assets
 attributed to:
  Investment income
    (loss)            360,684   318,740    89,027   298,830   877,800  10,968      1,491  169,900      12,114    134,425   2,273,979
  Employee
    contributions     416,381   244,668   713,643   708,611   818,257 139,633    772,250        -     168,821          -   3,982,264
   Rollovers          204,653   243,570   903,321   324,710   495,295  48,547    697,125        -     260,222          -   3,177,443
   Loan payments       84,115    49,910   108,557   154,502   149,423   8,590    173,484        -       8,393   (736,974)          -
   Net appreciation
    (depreciation)in
    fair value of
    investments             -    15,992 1,135,647 1,284,683   335,362  53,008  8,616,572        -  (2,139,857)         -   9,301,407
                   ----------   ------- --------- --------- --------- ------- ----------  -------  ----------   --------  ----------
Total additions     1,065,833   872,880 2,950,195 2,771,336 2,676,137 260,746 10,260,922  169,900  (1,690,307)  (602,549) 18,735,093
                   ----------   ------- --------- --------- --------- ------- ----------  -------  ----------   --------  ----------

Deductions from net
 assets attributed to:
   Employee loans      78,077    48,925    77,459    76,267   125,587   8,012    568,914   46,207      21,169 (1,050,617)          -
   Distributions to
    participants    2,753,964   750,495   938,957   918,425 1,340,297 145,970  5,940,944  690,588     266,047    328,513  14,074,200
   Fees                21,394       936       631       819     1,732      84    180,309    1,734       1,228          -     208,867
                   ----------   ------- --------- --------- --------- ------- ----------  -------  ---------- ----------  ----------
Total deductions    2,853,435   800,356 1,017,047   995,511 1,467,616 154,066  6,690,167  738,529     288,444   (722,104) 14,283,067
                   ----------   ------- --------- --------- --------- ------- ----------  -------  ---------- ----------  ----------

   Net increase
    (decrease)
      prior to
      interfund
      transfers    (1,787,602)   72,524 1,933,148 1,775,825 1,208,521 106,680  3,570,755 (568,629) (1,978,751)   119,555   4,452,026

   Interfund
      transfers     3,889,889  (594,457)  447,534  (296,676)  (12,735) 31,840 (3,518,507)(333,491)    386,603          -           -
                    ---------   ------- --------- --------- --------- ------- ---------- --------  ---------- ----------  ----------

    Net increase
     (decrease)     2,102,287  (521,933)2,380,682 1,479,149 1,195,786 138,520     52,248 (902,120) (1,592,148)   119,555   4,452,026

Net assets available for benefits:
   Beginning of
     year           6,920,007 5,536,114 3,680,362 6,188,725 7,286,947 364,755 35,727,154 3,178,713  2,740,713  1,538,357  73,161,847
                   ---------- --------- --------- --------- --------- ------- ---------- ---------  ---------  ---------  ----------

   End of year      9,022,294 5,014,181 6,061,044 7,667,874 8,482,733 503,275 35,779,402 2,276,593  1,148,565  1,657,912  77,613,873
                   ========== ========= ========= ========= ========= ======= ========== =========  =========  =========  ==========

</TABLE>




              See accompanying notes to financial statements.


<PAGE>

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

Statement of Changes in Net Assets Available for Benefits with Fund Information
               For the year ended December 31, 1997

<TABLE>

                                                                                          Pioneer   Pioneer
                                Vanguard                                 Vanguard           Natural   Natural
                        VMMR-    - ST   Vanguard   Vanguard   Vanguard  Internat.  Sarofim Resources Resources
                       Prime     Corp.  500 Index  Primecap  Windsor II  Growth    Equity   Stable    Stock  Participants'
                     Portfolio   Fund     Fund       Fund       Fund    Portfolio   Fund  Value Fund  Fund       Loans      Total
                     ---------   ----     ----       ----       ----    ---------   ----  ----------  ----       -----      -----
<S>                    <C>       <C>        <C>      <C>       <C>      <C>         <C>     <C>         <C>       <C>      <C>

Additions to net
 assets attributed
  to:
   Investment income   125,057   176,827    84,758   222,360   659,604  15,336      8,005   239,065     8,529     99,402   1,638,943
   Employer
    contributions      101,571    58,668   100,489   153,602   180,227  21,276          -         -   629,404          -   1,245,237
   Employee
    contributions      451,351   284,119   542,391   635,781   755,218 131,538    241,281         -    22,228          -   3,063,907
   Transfers from
    other plans      4,728,468 3,528,089         -         -         -       - 35,419,100         -         -          -  43,675,657
   Loan payments        81,688    40,610     2,120   128,600   141,128   4,152        750         -        52   (459,100)          -
   Net appreciation
    (depreciation)
    in fair value of
    investments              -    11,267   728,875 1,260,371 1,085,522 (13,464)   450,231         -  (603,051)         -   2,919,751
                     --------- --------- --------- --------- --------- ------- ----------   -------  --------   --------  ----------
    Total additions  5,488,135 4,099,580 1,518,633 2,400,714 2,821,699 158,838 36,119,367   239,065    57,162   (359,698) 52,543,495

Deductions from net
 assets attributed
  to:
   Employee loans       76,577    71,653   103,343   169,886   188,334   7,761    333,687    88,875       889 (1,041,005)          -
   Distributions
    to participants    276,375    80,913   104,683   176,923   373,691  13,112          -   238,428   108,770     36,709   1,409,604
   Fees                    860       540         -        40       300      40          -         -         -          -       1,780
                      -------- --------- --------- --------- --------- ------- ----------  --------  -------- ----------  ----------
    Total deductions   353,812   153,106   208,026   346,849   562,325  20,913    333,687   327,303   109,659 (1,004,296)  1,411,384

   Net increase
    (decrease)prior
    to interfund
    transfers        5,134,323 3,946,474 1,310,607 2,053,865 2,259,374 137,925 35,785,680   (88,238)  (52,497)   644,598  51,132,111

   Interfund
    transfers          109,653   (85,959)  193,581   204,528  (260,726) 95,626    (58,526) (528,343)  330,166          -           -
                     --------- --------- --------- ---------  -------- ------- ----------  --------   ------- ----------  ----------
   Net increase
    (decrease)       5,243,976 3,860,515 1,504,188 2,258,393 1,998,648 233,551 35,727,154  (616,581)  277,669    644,598  51,132,111

Net assets available
 for benefits:
   Beginning of
    year             1,676,031 1,675,599 2,176,174 3,930,332 5,288,299 131,204          - 3,795,294 2,463,044    893,759  22,029,736
                     --------- --------- --------- --------- --------- ------- ---------- --------- --------- ----------  ----------
   End of year       6,920,007 5,536,114 3,680,362 6,188,725 7,286,947 364,755 35,727,154 3,178,713 2,740,713  1,538,357  73,161,847

</TABLE>






           See accompanying notes to financial statements.

<PAGE>


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

                         NOTES TO FINANCIAL STATEMENTS
                          December 31, 1998 and 1997

Note 1.           Description of Plan

         The following  brief description of the Pioneer Natural Resources USA,
Inc. 401(k) 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) Plan Committee (the "Plan  Administrator").
The Plan is subject to the provisions of the Employee Retirement Income Security
Act of 1974 ("ERISA").

         General
         -------

         Parker & Parsley  Petroleum  Company  merged with MESA Inc.  ("Mesa")
during  August 1997,  creating a new  company,  Pioneer Natural  Resources
Company  (collectively,  the "Company").  As a result of the merger, the Parker
& Parsley  Retirement  Savings Plan became  Pioneer  Natural Resources USA, Inc.
401(k) Plan  effective  October 1, 1997 and the Mesa Profit Sharing Plan merged
into the Pioneer Natural Resources USA, Inc. 401(k) Plan on October 1, 1997. Net
assets of $43,675,657  were transferred into the Plan at fair value on the date
of transfer.

         The Plan is a defined  contribution  plan  established  under the
Internal Revenue Code (the "Code") Section 401 on January 1, 1990 covering all
employees of Pioneer Natural Resources USA, Inc. ("the Employer"), a wholly-
owned  subsidiary of the Company and its successor or  successors.  Regular
full-time  employees and part-time  employees are eligible to  participate  on
the first day of the month following their date of hire.

         Contributions
         -------------

         Prior to  October  1, 1997,  participants  of the Plan  contributed an
amount of not less than two  percent  nor more than 15 percent of their  annual
salary.  The Company  matched 100  percent of the first six percent of the Plan
participant's  compensation through  September 30, 1997.  The Company's
contributions  were made in the form of cash or in common  stock,  or in a
combination of cash and common stock.

         Effective  October 1, 1997,  participants  may  contribute  an amount
of not less than two percent nor more than 12 percent of their annual salary.
The Employer match is contributed in cash to the Pioneer Natural Resources USA,
Inc.  Matching Plan  ("Matching Plan") at an amount equal to 200 percent of the
first five percent of basic compensation contributed by the Plan participants.

<PAGE>

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

                        NOTES TO FINANCIAL STATEMENTS
                         December 31, 1998 and 1997

Note 1.           Description of Plan (continued)

         Participant Accounts
         --------------------

         Each participant's account is credited with the participant's
contributions and an allocation of Plan earnings.  Plan earnings are allocated
to each participant's account 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 account's vested balances,
whichever amount is less.  The loans are secured by the balance in the
participant's account.  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.

         Investment Options
         ------------------

         Except for the Pioneer Natural Resources Stable Value Fund, which
became closed to new investments prior to 1998, participants were able to
allocate their contributions among the following investment options during the
plan year ended Dccember 31, 1998:

         o        Vanguard  Money  Market  Reserves - Prime  Portolio - Seeks to
                  provide  high income and a stable share price of $1 by
                  investing 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 - ST Corporate Fund - Seeks to provide  income while
                  maintaining a high degree of stability of principal by
                  investing in short-term bonds, including high-quality
                  corporate and United States Treasury securities.

         o        Vanguard 500 Index Fund - Seeks to provide  long-term  growth
                  of capital and income from  dividends by holding all of
                  the 500 stocks that make up the unmanaged  Standard & Poor's
                  500  Composite  Stock Price Index,  a widely  recognized
                  benchmark of United States. stock market performance.

         o        Vanguard  Primecap Fund - Seeks  long-term  growth of capital
                  by investing in stocks of companies with  above-average
                  prospects for continued earnings growth, strong industry
                  positions and skilled management teams.

<PAGE>


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

                               NOTES TO FINANCIAL STATEMENTS
                                 December 31, 1998 and 1997

Note 1.           Description of Plan (continued)

         o        Vanguard  Windsor II Fund - Seeks to provide long-term growth
                  of capital and income from dividends by investing in a
                  diversified group of out-of-favor stocks of large
                  capitalization companies. The stocks generally sell at prices
                  below the overall market average compared to their dividend
                  income and future return potential.

         o        Vanguard  International  Growth  Fund - Seeks to  provide
                  long-term  growth of  capital  by  investing  in stocks of
                  high-quality, seasoned companies based outside the United
                  States.  Stocks are selected from more than 15 countries.

         o        Sarofim Equity Fund - Seeks to provide high growth of capital
                  by investing in a broadly diversified  portfolio of
                  large companies.  Income is a secondary goal.

         o        Pioneer Natural Resources Stable Value Fund - Seeks to provide
                  a high level of income and a stable unit value of $1
                  in most cases.

         o        Pioneer  Natural  Resources Stock Fund - The Pioneer  Natural
                  Resources Stock 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.

         Vesting
         -------

         As is described in more detail in "Contributions" above,  participants'
contributions and Plan earnings are maintained in the Plan.  Employer
contributions are maintained in the Matching Plan, together with the earnings
of the Matching Plan.

         Participants  are  immediately  vested in their voluntary contributions
made into the Plan plus the actual  Plan earnings thereon. Vesting in the
Matching Plan is based upon years of continuous service. A participant is fully
vested in the Matching Plan after four years of service.

         During 1998,  certain  participants  were terminated by the Company in
connection  with a corporate reorganization.  By amendment to the Plan, these
participants  became fully vested in all contributions to the Plan, as of their
dates of termination.


<PAGE>

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

                         NOTES TO FINANCIAL STATEMENTS
                           December 31, 1998 and 1997

Note 1.           Description of Plan (continued)

         Payments of Benefits
         --------------------

         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.  If the  total  value of the  vested  portion  of
the participant's  account exceeds $5,000, payment will occur 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.  A  participant's beneficiary will
receive the participant's account balance in the event of a participant's death.


         Withdrawal of Benefits
         ----------------------

         Employees may withdraw  their vested assets in the Plan under certain
hardship conditions as defined in the Plan  agreement.  Terminated participants
may also withdraw their vested assets in the Plan.

         Plan Termination
         ----------------

         Although  it has not  expressed  any  intent  to do so,  the  Employer
has the  right  under  the  Plan  to  discontinue  its contributions  at any
time and to  terminate  the Plan  subject to the  provisions  of ERISA.  In the
event of the Plan's termination, 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 on the accrual
basis of accounting.

         Investment Valuation
         --------------------

         Investments  are valued at fair value as determined  by Vanguard
Fiduciary  Trust  Company  (the  "Trustee").  Fair value is determined as
follows:

1)       Investments  in securities  traded on national  securities  exchanges
         are valued at the last reported  sales price on the last business day
         of the year;


<PAGE>

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

                              NOTES TO FINANCIAL STATEMENTS
                                December 31, 1998 and 1997

Note 2.           Summary of Significant Accounting Policies (continued)
- -------            ------------------------------------------------------

2)       Investments in guaranteed  investment  contracts with insurance
         companies are valued at contract  value,  which  approximates
         fair value (see Note 3. of the Notes to Financial Statements); and

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
generally  accepted  accounting  principles  requires the Plan Administrator to
make estimates that affect the reported  amounts of net assets
available for benefits at the date of the financial statements and the reported
changes in net assets available for benefits during the reporting  periods.
Actual results could differ from those estimates.

         Reclassifications
         -----------------

         Certain reclassifications have been made to the 1997 amounts to conform
 to the 1998 presentation.

Note 3.           Investments
- -------           -----------

         The Pioneer Natural Resources Stable Value Fund is composed of
investment  contracts issued by insurance  companies as well as a money market
account which acts as a holding account as the contracts mature.  Each contract
earns a guaranteed  annual  interest rate for a specific  period of time.  The
accounts earn interest as credited by the insurer.  The guaranteed annual rates
ranged from 5.9 percent to 7.7 percent during 1998 and the average annual yield
ranged from 5.9 percent to 7.4 percent  during  1998,  and 5.4 percent to 7.7
percent  during 1997. The contracts mature on December 31, 1999 and are stated
at contract  value which  approximates fair value.

<PAGE>

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

                         NOTES TO FINANCIAL STATEMENTS
                          December 31, 1998 and 1997

Note 3.           Investments (continued)
- -------           -----------------------

         The number of units and net asset value per unit for the Pioneer
Natural Resources Stock Fund at December 31, 1998 and 1997 was 363,470 and $3.16
and 262,769 and $10.43, respectively.


Note 4.           Administrative Expenses
- -------           -----------------------

         Administrative expenses incurred by the Plan were $208,867 and
$1,780 during the yesrs ended December 31, 1998 and 1997, respectively.  The
increase in expenses incurred is primarily reflective of Sarofim Equity Fund
fees that were paid by Mesa during 1997, but are being incurred by the Plan
since the merger of the Mesa Profit Sharing Plan in 1997 (see Note 1. to the
Notes to Financial Statements).  The Employer may pay certain expenses incurred
in the establishment and administration of the Plan, including expenses and fees
of the Trustee, but it shall not be obligated to do so, and any such expenses
not paid by the Employer shall be paid from the Plan earnings. The Employer paid
approximately $46,000 and $58,000 of administrative expenses relating to 1998
and 1997, respectively.

Note 5.           Tax Status of the Plan
- -------           ----------------------

         The Plan has received a determination letter from the Internal Revenue
Service dated January 14, 1999, stating that the Plan is qualified under Section
401(a) of the Code and, therefore,  the related trust is exempt from taxation.
Once qualified,  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 shares of mutual funds managed by
Vanguard  Fiduciary Trust Company.  Vanguard  Fiduciary Trust Company is the
Trustee as defined by the Plan and, therefore, these transactions qualify as
party-in-interest.

PAGE>

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

                     NOTES TO FINANCIAL STATEMENTS
                      December 31, 1998 and 1997


Note 7.           Reconciliation of Financial Statements to Forms 5500
- -------           ----------------------------------------------------

         The following is a reconciliation of net assets available for benefits
 per the financial statements to the Form 5500:
<TABLE>

                                                           December 31,
                                                   -------------------------
                                                   1998                1997
                                                   ----                ----
<S>                                              <C>               <C>

Net assets available for benefits per the
 accompanying financial statements               $77,613,873       $73,161,847
 allocated to withdrawing participants               (84,710)         (237,736)
                                                 -----------       -----------
Net assets available for benefits per the
 Form 5500                                       $77,529,163       $72,924,111
                                                 ===========       ===========
</TABLE>

         The following is a reconciliation of distributions to participants per
the financial statements to the Forms 5500:

<TABLE>

                                                       For the year ended
                                                       ------------------
                                                           December 31,
                                                       1998          1997
                                                       ----          ----
<S>                                             <C>                <C>

Distributions to participants per the
 accompanying financial statements              $ 14,074,200       $ 1,409,604
Add: Amounts allocated to withdrawing
 participants at end of year                          84,710           237,736
Less: amounts allocated to withdrawing
 participants at beginning of year                  (237,736)          (46,113)
                                                ------------       -----------
Distributions to participants per the
 Form 5500                                      $ 13,921,174       $ 1,601,227
                                                ============       ===========
</TABLE>

         Amounts  allocated to withdrawing  participants  are recorded on the
Form 5500 for benefit claims that have been processed and approved for payment
prior to December 31, but not yet paid as of that date.



<PAGE>

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

                       NOTES TO FINANCIAL STATEMENTS
                         December 31, 1998 and 1997



Note 8.           Subsequent Event

         Effective  April 1,  1999,  the Plan was amended to allow  participants
to change their  applicable  percentage  of payroll deductions as of the first
day of the first pay period in any calendar  month.  Prior to the  amendment,
participants could only make percentage of payroll deduction changes quarterly.

<PAGE>


                                                              EIN: 75-2516853
                                                             Plan Number: 001
                   PIONEER NATURAL RESOURCES USA, INC.
                              401(k)

        Line 27a - Schedule of Assets Held for Investment Purposes

                        As of December 31, 1998

<TABLE>

                                                (c)
                                          Description of
                  (b)                  investment including
           Identify of issue           maturity date, rate of                       (e)
            borrower, lessor,         interest, collateral, par     (d)           Current
  (a)       or similar party             or maturity value          Cost           Value
- -------  -----------------------     --------------------------    ------        --------
<S> <C>    <C>                          <C>                        <C>           <C>

    *      VMMR- Prime Portfolio        Money Market Fund          $ 9,022,294   $9,022,294
    *      Vanguard-ST                   Registered Investment
               Corporate Fund             Company                    4,990,127    5,014,181
    *      Vanguard 500 Index            Registered Investment
               Fund                       Company                    4,443,663    6,061,044
    *      Vanguard Primecap Fund        Registered Investment
                                          Company                    5,432,011    7,667,874
    *      Vanguard Windsor II Fund      Registered Investment
                                          Company                    7,412,372    8,482,733
    *      Vanguard International        Registered Investment
               Growth Fund                Company                      468,142      503,275
           Sarofim Equity Fund           Registered Investment
                                          Company                   28,018,845   35,779,402
    *      Pioneer Natural Resources
               Stable Value Fund:
                 New York Life           Guaranteed Insurance
                  Insurance Company       Contract                     606,978      606,978
                 VGI Prime Money
                  Market Fund            Money Market Fund           1,669,615    1,669,615
    *      Pioneer Natural Resources
                Stock Fund               Common Stock Fund           2,776,429    1,148,565
    *      Participants' loans           Interest rates ranging
                                          from 7% - 10%                      -    1,657,912
                                                                   -----------  -----------
                                                                   $64,840,476  $77,613,873
                                                                   ===========  ===========
</TABLE>

___________________________
*Party in-interest


PAGE>

                                                                EIN: 75-2516853
                                                                Plan Number: 001

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

                  Line 27d - Schedule of Reportable Transactions
                            Year ended December 31, 1998




<TABLE>
                                                                                                              (h)
                                                                                                            Current
                                                                                                             Value
        (a)                                                       (c)               (d)          (g)      of asset on         (i)
   Identity of              (b)                                Purchase          Selling       Cost of    transaction         Net
 Party Involved     Description of Asset                         Price             Price       Assets        date            gain
- ----------------    ---------------------------------------    ---------         --------     --------   ------------      -------
                    Category (iii) - series of transactions
                    in excess of five percent of net assets:
<S>     <C>              <C>                                  <C>               <C>           <C>          <C>           <C>

        *                Sarofim Equity Fund                  $ 2,706,796       $         -   $2,706,796   $ 2,706,796   $        -
                                                                                 11,271,120    9,985,980    11,271,120    1,285,140

        *                VMMR -Prime Portfolio                  6,911,386                 -    6,911,386     6,911,386            -
                                                                                  4,809,099    4,809,099     4,809,099            -

        *                Vanguard 500 Index Fund                2,654,750                 -    2,654,750     2,654,750            -
                                                                                  1,409,715    1,088,979     1,409,715      320,736

        *                Vanguard Primecap Fund                 2,204,475                 -    2,204,475     2,204,475            -
                                                                                  2,010,009    1,622,115     2,010,009      387,894

        *                Vanguard Windsor II Fund               3,130,018                 -    3,130,018     3,130,018            -
                                                                                  2,269,594    1,852,705     2,269,594      416,889


</TABLE>

______________________
*Vanguard Fiduciary Trust Company
There were no category (i), (ii) or (iv) transactions during 1998 and columns(e)
and (f) are not applicable.








<PAGE>

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

                                S I G N A T U R E S

The Plan, pursuant to the requirements of the Securities Exchange Act of 1934,
the trustee 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) PLAN


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



Date:    June 25, 1999          By: /s/ Larry N. Paulsen
                                    --------------------------------
                                         Larry N. Paulsen
                                         Chairman


Date:    June 25, 1999          By: /s/ John V. Peters
                                    --------------------------------
                                         John V. Peters

Date:    June 25, 1999          By: /s/ Kevin W. Reed
                                    --------------------------------
                                         Kevin W. Reed

Date:    June 25, 1999          By: /s/ David W. Simpson
                                    --------------------------------
                                         David W. Simpson

Date:    June 25, 1999          By: /s/ M. Garrett Smith
                                    --------------------------------
                                         M. Garrett Smith



PAGE>

INDEX TO EXHIBITS

<TABLE>

Exhibit
Number   Description                         Page
- ------   ---------------------------         ----
<S>      <C>                                 <C>

23.1     Consent of Ernst & Young LLP

23.2     Consent of KPMG LLP

</TABLE>

<PAGE>

                                                                  EXHIBIT 23.1

                        CONSENT OF INDEPENDENT AUDITORS



We consent to the incorporation by reference in the Registration  Statement
(Form S-8 No. 333-39249)  pertaining to the Pioneer Natural Resources  USA, Inc.
401(k) Plan of our report dated May 18, 1999,  with respect to the  financial
statements  and schedules of the Pioneer Natural Resources USA, Inc. 401(k)Plan
included in this Annual Report on Form 11-K for the year ended December 31,
1998.

                                      Ernst & Young LLP

Fort Worth, Texas
June 28, 1999

PAGE>

                                                                 EXHIBIT 23.2

                         CONSENT OF INDEPENDENT AUDITORS


Pioneer Natural Resources Company
  Pioneer Natural Resources USA, Inc.
    401(k) Plan Committee

We consent to incorporation by reference in the registration  statement
(No.  333-39249) on Form S-8 of Pioneer Natural  Resources USA, Inc.  401(k)
Plan of our report dated June 12, 1998, relating to the  statement of net assets
available  for benefits of the Pioneer Natural  Resources  USA,  Inc. 401(k)
Plan as of December 31, 1997 and the related statement of changes in net assets
available  for benefits for the year ended December 31, 1997,  which report
appears in the December 31, 1998 annual report on Form 11-K of the Pioneer
Natural  Resources  USA, Inc. 401(k) Plan.


                                        KPMG LLP

Midland, Texas
June 28, 1999


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