EXHIBIT 99.1


                                  NEWS RELEASE

                                                               Company Contacts:
                                                      Investors:   Frank Hopkins
                                      Media and Public Affairs:   Susan Spratlen
                                                                  (972) 444-9001

                   Pioneer Reports First Quarter 2006 Results

             Sees early success in accelerated onshore North America
                            production growth program

          Discovers two new fields in the Edwards Trend in South Texas

Dallas, Texas, May 9, 2006 -- Pioneer Natural Resources Company (NYSE:PXD) today
announced financial and operating results for the quarter ended March 31, 2006.

o    Pioneer  reported net income of $543  million,  or $4.28 per diluted  share
     compared to net income for the same quarter  last year of $85  million,  or
     $.58 per diluted share.
o    First  quarter  oil and  gas  sales  from  continuing  operations  exceeded
     guidance, averaging 95,250 barrels oil equivalent per day (BOEPD).
o    North American  production  rose 6% from equivalent  volumetric  production
     payment (VPP)  adjusted 2005 first quarter  levels,  reflecting the initial
     results from Pioneer's accelerated production growth program.
         o  North American  fields represented 92% of  first quarter oil and gas
            sales from continuing operations.
         o  Production from Spraberry,  Raton  and Canadian  fields continues to
            increase.
         o  Drilling activity is  expected to  progressively increase throughout
            the year.
o    North American rig count grew to 25 during the first quarter with contracts
     for 15 additional rigs by year end.
o    Production  growth is on track to meet or exceed targeted 2006 exit rate of
     95,000 to 100,000 BOEPD.
o    Two new fields discovered in the Edwards Trend are expected to provide 2006
     production upside and substantial growth potential.
o    Encouraging  results to date  indicate  additional  upside  potential  from
     resource plays in the Rockies,  Canada, Tunisia and other U.S. onshore Gulf
     Coast areas.
o    South Coast Gas and  Oooguruk  development  projects  are on  schedule  and
     expected  to  add  significant   production   volumes  in  2007  and  2008,
     respectively.

Net  income for the first  quarter of 2006  included  an  after-tax  gain on the
disposition of deepwater  Gulf of Mexico (GOM) assets of $472 million,  or $3.72
per diluted share,  which was included in income from  discontinued  operations.
Net income also included the following unusual items:

o    incremental  after-tax  abandonment charge relating to a GOM shelf platform
     destroyed by Hurricane Rita (East Cameron 322) of $27 million,  or $.21 per
     diluted share,
o    after-tax gain related to business  interruption  insurance on East Cameron
     322 and the Fain Gas Plant of $5 million, or $.04 per diluted share and
o    valuation  allowance of the income tax benefit  related to the dry hole and
     acreage  costs of the Pina 1-X well in Nigeria of $17 million,  or $.13 per
     diluted share.

Pioneer  closed the $1.3 billion  divestiture of deepwater GOM assets during the
first  quarter and closed the $675 million sale of its  Argentine  operations in
April.  In addition to the gain on  disposition  of  deepwater  GOM assets,  the
Company also  reported  after-tax  income from  discontinued  operations  of $72
million,  or $.57 per  diluted  share,  related to the  operating  income of the
divested proprties prior to closing.








Cash flow from  operating  activities  for the first  quarter was $303  million,
essentially  unchanged  from the same period in 2005.  Having now  released  its
quarterly  earnings,  Pioneer  expects to initiate the repurchase of outstanding
shares under the remaining $359 million repurchase program previously authorized
by its board of directors.

Operations Review

Scott D.  Sheffield,  Pioneer's  Chairman and CEO,  stated,  "Our first  quarter
achievements  in  accelerating   field   development,   establishing  new  field
opportunities and progressing our longer-term projects support our confidence in
delivering  double-digit  compound average  production growth over the next five
years."

Production  from  the  Spraberry  field  has  already  begun to  respond  to the
accelerated drilling activity,  rising 16% versus the prior year quarter to more
than 22 thousand BOEPD. Over the next 8 months,  Pioneer plans to add at least 7
additional rigs to the 350-well Spraberry  drilling program,  bringing the total
rig count to at least 18 by year end.  Through April,  76 wells had been drilled
in the field.

Production from the Company's  Mid-Continent fields, Hugoton and West Panhandle,
exceeded expectations for the first quarter, rising slightly from the prior-year
period to 131 million cubic feet per day (MMcfpd) as the mild winter resulted in
less downtime.

In the Edwards Trend in South Texas,  Pioneer has  discovered 2 new fields which
are  analogous  to its  300-Bcf  Pawnee  field  and  the  Washburn  field.  Four
successful  wells have now been drilled in the first new field  discovery in the
Sinor area that tested at between 2.5 and 3.2 MMcfpd  before  being  stimulated.
These 4 wells are expected to be on production by the end of the second quarter,
and the full  field  development  plan is being  prepared.  The second new field
discovery was drilled on the Stingray prospect  approximately 90 miles northeast
of the Pawnee field. Early results indicate the new field could have significant
resource  potential.  Wells in this field are also  anticipated to be online and
producing by late second quarter.  Production from the new field discoveries was
not included in Pioneer's forecasted 2006 exit rates offering upside potential.

Three  additional  new-field  prospects are  scheduled to be drilled  during the
second quarter to continue the Edwards  resource play expansion along the trend.
Pioneer  holds  more than  200,000  gross  acres in the trend  area,  has 4 rigs
currently  dedicated  to the  resource  play and is adding 2 rigs to the program
during 2006 and at least 1 rig during 2007.  The Company plans to drill at least
35 Edwards development and exploration wells during 2006.

In the Rocky Mountains, first quarter coal bed methane (CBM) production from the
Raton  field was up 6% from the prior  year,  meeting  expectations.  A pipeline
expansion  and efforts to reduce  wellhead  and field  pressure  are expected to
enhance  production  along with the 330-well  drilling  program that Pioneer has
budgeted for the year. Through April,  Pioneer had drilled 94 of the Raton wells
planned for 2006.

In northwest Colorado, Pioneer's programs to evaluate the CBM resource potential
at Lay Creek and Columbine  Springs are  progressing.  At Lay Creek, the Company
has  drilled 5 pilot wells and  completed  workovers  on 2 wells  drilled by the
previous  operator.  Results to date  indicate  that the coals are permeable and
thicker than expected. During the second half of 2006, Pioneer plans to drill 14
development wells and install the infrastructure to initiate sales by the end of
the year.  Drilling on 2 additional  pilot wells is expected to commence  during
the second quarter. At Columbine Springs, Pioneer expects to complete its 7-well
extension  pilot program by the end of July and have these and 23 existing wells
on production by the end of the third quarter to assess production potential and
water-handling requirements. Full-field development could begin in 2007. Pioneer
also plans to drill 5 wells to further  evaluate its resource play at Castlegate
and to test its conventional Entrada gas play, both in the Uinta Basin in Utah.

In Canada, Pioneer drilled 44 Chinchaga  winter-access  development wells during
the first  quarter  with 90% success  and  expects to have all the wells  online
during May. At Horseshoe  Canyon,  the Company drilled 18 wells during the first
quarter and is increasing its  development  program to 200 wells for 2006 with 2
rigs  contracted  to begin  drilling  after  the  weather-related  road bans are
lifted.  Pioneer  also  plans to drill two  horizontal  wells  during the second
quarter to test the potential of Mannville CBM in the Bashaw area. First quarter
production  from  Canada  rose 5% from the  first  quarter  of 2005 and does not
reflect  the impact of  winter-drilling  at  Chinchaga  or the  increase  in rig
activity at Horseshoe Canyon.








The Adam 4 well  drilled  during the first  quarter in Tunisia  was  successful,
extending  Pioneer's 100% success rate in the concession  where a 2-rig drilling
program is underway.  On the adjacent  Jenein Nord block,  Pioneer  acquired the
remaining  equity interest in February,  becoming the operator of the block with
100% working interest and is currently acquiring 3-D seismic on both Jenein Nord
and Adam.  A well is planned  during  the  second  quarter on the Borj El Khadra
block which is adjacent to the Adam Concession.

Significant  progress was also made on  Pioneer's  two  longer-term  development
projects in South Africa and Alaska. Two development wells were drilled offshore
South Africa to progress the South Coast Gas project.  Fabrication of the subsea
tie-back equipment also commenced with installation  expected to be initiated by
year end. Four additional  development wells are expected to be drilled over the
next 8 to 9 months to  achieve  first  production  from the  project  during the
second half of 2007.

On the  Oooguruk  development  project  on the North  Slope of  Alaska,  Pioneer
completed the  construction  of the gravel drill site during  April.  Additional
work on the project  scheduled  for 2006  includes  contouring  and armoring the
drill  site,   fabricating   equipment   and  modifying  the  drilling  rig  for
installation  during  2007.  The  project is on  schedule  to achieve  first oil
production in 2008.

Financial Review

First quarter oil sales  averaged  24,896  barrels per day (BPD) and natural gas
liquids sales averaged  18,595 BPD. Gas sales in the first quarter  averaged 311
MMcfpd. The reported price for oil was $60.01 per barrel and included $12.91 per
barrel  related  to  deferred  revenue  from  VPPs for which  production  is not
recorded.  The price for natural gas liquids was $34.20 per barrel. The reported
price for gas was $6.72 per thousand  cubic feet (Mcf) and included $.68 per Mcf
related to deferred revenue from VPPs for which production is not recorded.

First quarter  production  costs  averaged  $11.04 per barrel of oil  equivalent
(BOE)  reflecting the impact of the  divestitures  of  lower-cost,  lower-margin
fields in Argentina and  lower-cost,  short-lived  fields in the deepwater  GOM,
incremental  workover  costs to  maximize  production,  an  increase in pipeline
transportation  costs and an  increase  in the VPP  volumes  for which costs are
included but production is not recorded.  Exploration and abandonment costs were
$125 million for the quarter and included $42 million of incremental  before-tax
cost to abandon the East Cameron 322 field as discussed previously,  $33 million
of dry hole and acreage costs associated with the unsuccessful  Pina 1-X well in
Nigeria,  $31 million of geologic and geophysical expenses including seismic and
personnel costs and $19 million of other drilling and acreage costs.

Financial Outlook

The following  statements  are estimates  based on current  expectations.  These
forward-looking  statements  are subject to a number of risks and  uncertainties
that may cause the  Company's  actual  results  to  differ  materially  from the
following  statements.  The last paragraph of this release  addresses certain of
the risks and uncertainties to which the Company is subject.

Second  quarter 2006  production is expected to average  93,000 to 98,000 BOEPD.
Second quarter  production costs (including  production and ad valorem taxes and
transportation  costs) are expected to average $11.00 to $12.00 per BOE based on
current  NYMEX  strip  prices  for  oil and  gas.  Depreciation,  depletion  and
amortization expense is expected to average $9.25 to $10.25 per BOE.

Total  exploration and abandonment  expense is expected to be $25 million to $55
million and  includes $4 million to $30 million of  carryover  costs  associated
with high-impact wells drilled in Alaska during the first quarter and lower-risk
resource  plays in the Edwards  Trend in South Texas and in Canada and  Tunisia.
Exploration  expense  also  includes  $21  million to $25  million  for  seismic
investments  and  personnel,  primarily  related to the onshore  resource  plays
Pioneer is currently pursuing. General and administrative expense is expected to
be $31 million to $34 million. Interest expense is expected to be $24 million to
$27 million, offset by interest income of $3 million to $4 million. Accretion of
discount  on asset  retirement  obligations  is  expected to be $1 million to $2
million.

Pioneer  will record a nominal  gain from the sale of its  Argentine  operations
during the second quarter,  and Argentine  operating income will be reflected in
discontinued operations.  Incremental insurance recoveries  related to Pioneer's





coverage for business interruption and damage related to the 2005 hurricanes are
expected to be reflected in future quarters.

The Company's second quarter effective income tax rate is expected to range from
35% to 45% based on  current  capital  spending  plans.  Cash  income  taxes are
expected  to range  from $5  million  to $15  million,  principally  related  to
Tunisian income taxes and nominal alternative minimum tax in the U.S.

The  Company's  financial  results  and oil and gas hedges are  outlined  on the
attached schedules.

Earnings Conference Call

This  morning at 10:00 a.m.  Eastern,  Pioneer  will  discuss its first  quarter
financial and operating results with an accompanying presentation. The call will
be webcast on Pioneer's website,  www.pxd.com. At the website, select 'INVESTOR'
at the top of the page.  For those who cannot  listen to the live  broadcast,  a
replay will be available shortly after the call. Or you may choose to dial (800)
946-0782  (confirmation  code:  2474815) to listen to the call by telephone  and
view the  accompanying  visual  presentation  at the website  above. A telephone
replay will be available by dialing (888) 203-1112 (confirmation code: 2474815).

Pioneer is a large  independent oil and gas exploration and production  company,
headquartered  in  Dallas,  with  operations  in the United  States,  Canada and
Africa. For more information, visit Pioneer's website at www.pxd.com.

Except for historical  information contained herein, the statements in this News
Release are forward-looking statements that are made pursuant to the Safe Harbor
Provisions of the Private  Securities  Litigation  Reform Act of 1995.  Forward-
looking statements and the business prospects of Pioneer are subject to a number
of risks and  uncertainties  that may cause  Pioneer's  actual results in future
periods to differ materially from the  forward-looking  statements.  These risks
and uncertainties include, among other things, volatility of oil and gas prices,
product supply and demand, competition,  the ability to obtain environmental and
other permits and the timing  thereof,  other  government  regulation or action,
third party  approvals,  international  operations and associated  international
political  and  economic  instability,  litigation,  the  costs and  results  of
drilling and operations,  availability of drilling equipment,  Pioneer's ability
to  replace  reserves,  implement  its  business  plans  (including  its plan to
repurchase stock), or complete its development projects as scheduled,  access to
and cost of capital,  uncertainties about estimates of reserves, the assumptions
underlying  production forecasts,  quality of technical data,  environmental and
weather risks, acts of war or terrorism.  These and other risks are described in
Pioneer's  10-K and 10-Q  Reports  and other  filings  with the  Securities  and
Exchange Commission.







                        PIONEER NATURAL RESOURCES COMPANY
                      CONDENSED CONSOLIDATED BALANCE SHEETS
                                 (in thousands)



                                                             March 31,       December 31,
                                                               2006              2005
                                                            -----------      ------------
                                                            (Unaudited)

                                     ASSETS
                                                                       
Current assets:
   Cash and cash equivalents                                $    42,982      $    18,802
   Accounts receivable, net                                     187,197          337,658
   Inventories                                                   89,942           79,659
   Prepaid expenses                                              28,550           18,091
   Deferred income taxes                                        111,644          158,878
   Discontinued operations held for sale                        733,409              -
   Other current assets, net                                     18,914           10,716
                                                             ----------       ----------
        Total current assets                                  1,212,638          623,804
                                                             ----------       ----------

Property, plant and equipment, at cost:
   Oil and gas properties, using the successful efforts
     method of accounting                                     7,076,565        8,813,134
   Accumulated depletion, depreciation and amortization      (1,632,887)      (2,577,946)
                                                             ----------       ----------
        Total property, plant and equipment                   5,443,678        6,235,188
                                                             ----------       ----------
Goodwill                                                        311,603          311,651
Other assets, net                                               141,330          158,591
                                                             ----------       ----------
                                                            $ 7,109,249      $ 7,329,234
                                                             ==========       ==========

                      LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
   Accounts payable                                         $   237,402      $   345,204
   Interest payable                                              18,442           40,314
   Income taxes payable                                         151,061           22,470
   Deferred revenue                                             187,412          190,327
   Discontinued operations held for sale                         66,322              -
   Other current liabilities                                    334,442          435,040
                                                             ----------       ----------
        Total current liabilities                               995,081        1,033,355
                                                             ----------       ----------

Long-term debt                                                1,159,763        2,058,412
Deferred income taxes                                           989,564          767,329
Deferred revenue                                                619,477          664,511
Other liabilities and minority interests                        389,553          588,525
Stockholders' equity                                          2,955,811        2,217,102
                                                             ----------       ----------
                                                            $ 7,109,249      $ 7,329,234
                                                             ==========       ==========







                        PIONEER NATURAL RESOURCES COMPANY
                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS
                    (in thousands, except for per share data)
                                   (Unaudited)



                                                                Three months ended
                                                                     March 31,
                                                            --------------------------
                                                               2006            2005
                                                            ----------     -----------

                                                                     
Revenues and other income:
   Oil and gas                                              $  379,468     $  323,115
   Interest and other                                           17,111          2,306
   Gain (loss) on disposition of assets, net                       (73)         2,141
                                                             ---------      ---------
                                                               396,506        327,562
                                                             ---------      ---------
Costs and expenses:
   Oil and gas production                                       94,683         80,946
   Depletion, depreciation and amortization                     82,406         73,308
   Impairment of long-lived assets                                 -              152
   Exploration and abandonments                                124,642         53,829
   General and administrative                                   32,247         27,488
   Accretion of discount on asset retirement obligations         1,148          1,499
   Interest                                                     36,576         32,746
   Other                                                         5,054          8,841
                                                             ---------      ---------
                                                               376,756        278,809
                                                             ---------      ---------
Income from continuing operations before income taxes           19,750         48,753
Income tax provision                                           (20,717)       (21,762)
                                                             ---------      ---------
Income (loss) from continuing operations                          (967)        26,991
Income from discontinued operations, net of tax                544,174         57,666
                                                             ---------      ---------
Net income                                                  $  543,207     $   84,657
                                                             =========      =========

Basic earnings per share:
   Income (loss) from continuing operations                 $     (.01)    $      .19
   Income from discontinued operations, net of tax                4.29            .40
                                                             ---------      ---------
   Net income                                               $     4.28     $      .59
                                                             =========      =========
Diluted earnings per share:
   Income (loss) from continuing operations                 $     (.01)    $      .19
   Income from discontinued operations, net of tax                4.29            .39
                                                             ---------      ---------
   Net income                                               $     4.28     $      .58
                                                             =========      =========
Weighted average shares outstanding:
   Basic                                                       126,944        142,898
                                                             =========      =========
   Diluted                                                     126,944        147,345
                                                             =========      =========






                        PIONEER NATURAL RESOURCES COMPANY
                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (in thousands)
                                   (Unaudited)




                                                                  Three months ended
                                                                        March 31,
                                                               -------------------------
                                                                  2006            2005
                                                               ----------     ----------
                                                                        
Cash flows from operating activities:
   Net income                                                  $  543,207     $   84,657
   Depletion, depreciation and amortization                        82,406         73,308
   Impairment of long-lived assets                                    -              152
   Exploration expenses, including dry holes                       94,582         16,676
   Deferred income taxes                                           16,961         15,197
   Loss (gain) on disposition of assets, net                           73         (2,141)
   Accretion of discount on asset retirement obligations            1,148          1,499
   Discontinued operations                                       (539,653)       122,749
   Interest expense                                                 3,047            197
   Commodity hedge related activity                                   508         (3,061)
   Stock-based compensation                                         7,486          5,152
   Amortization of deferred revenue                               (47,949)       (11,625)
   Other noncash items                                              3,714          4,146
   Changes in operating assets and liabilities, net of
     effects from acquisition:
      Accounts receivable, net                                    126,115        (12,033)
      Inventories                                                 (20,131)        (1,315)
      Prepaid expenses                                            (12,264)         2,449
      Other current assets, net                                     9,429           (198)
      Accounts payable                                            (93,648)        17,593
      Interest payable                                            (19,100)       (16,259)
      Income taxes payable                                        134,051          2,775
      Other current liabilities                                    13,365          3,736
                                                                ---------      ---------
Net cash provided by operating activities                         303,347        303,654
Net cash provided by investing activities                         621,755        393,129
Net cash used in financing activities                            (900,583)      (688,202)
                                                                ---------      ---------
Net increase in cash and cash equivalents                          24,519          8,581
Effect of exchange rate changes on cash
   and cash equivalents                                              (339)           201
Cash and cash equivalents, beginning of period                     18,802          7,257
                                                                ---------      ---------
Cash and cash equivalents, end of period                       $   42,982     $   16,039
                                                                =========      =========







                        PIONEER NATURAL RESOURCES COMPANY
                        SUMMARY PRODUCTION AND PRICE DATA
                                   (Unaudited)



                                                            Three months ended
                                                                 March 31,
                                                         -----------------------
                                                            2006          2005
                                                         ---------     ---------
                                                                 
Average Daily Sales Volumes from
  Continuing Operations:
   Oil (Bbls) -                       U.S.                  16,965        22,522
                                      Canada                   277           161
                                      Africa                 7,654        11,967
                                                         ---------     ---------
                                      Worldwide             24,896        34,650
                                                         =========     =========

   Natural gas liquids (Bbls) -       U.S.                  18,176        17,489
                                      Canada                   419           417
                                                         ---------     ---------
                                      Worldwide             18,595        17,906
                                                         =========     =========

   Gas (Mcf) -                        U.S.                 274,773       283,080
                                      Canada                35,782        34,171
                                                         ---------     ---------
                                      Worldwide            310,555       317,251
                                                         =========     =========

Average Daily Sales Volumes
  from Discontinued Operations:
   Oil (Bbls) -                       U.S.                   9,732         6,201
                                      Argentina              7,184         8,191
                                      Canada                   -              69
                                                         ---------     ---------
                                      Worldwide             16,916        14,461
                                                         =========     =========

   Natural gas liquids (Bbls) -       U.S.                     -              55
                                      Argentina              1,296         1,572
                                      Canada                   -             184
                                                         ---------     ---------
                                      Worldwide              1,296         1,811
                                                         =========     =========

   Gas (Mcf) -                        U.S.                 145,002       255,205
                                      Argentina            135,047       130,351
                                      Canada                   -          15,375
                                                         ---------     ---------
                                      Worldwide            280,049       400,931
                                                         =========     =========

Average Reported Price (a):
   Oil (per Bbl) -                    U.S.               $   59.97     $   29.94
                                      Canada             $   67.11     $   50.88
                                      Africa             $   59.84     $   44.28
                                      Worldwide          $   60.01     $   34.99

   Natural gas liquids (per Bbl)  -   U.S.               $   33.74     $   26.12
                                      Canada             $   54.23     $   37.97
                                      Worldwide          $   34.20     $   26.39

   Gas (per Mcf) -                    U.S.               $    6.60     $    6.01
                                      Canada             $    7.65     $    5.96
                                      Worldwide          $    6.72     $    6.01
<FN>
- ---------------
(a)  Average prices are  attributable  to continuing  operations and include the
     results of hedging activities and amortization of VPP deferred revenue.
</FN>






                        PIONEER NATURAL RESOURCES COMPANY
                    SUPPLEMENTAL NON-GAAP FINANCIAL MEASURES
                                 (in thousands)
                                   (Unaudited)


     EBITDAX  and  discretionary  cash  flow  ("DCF")  (as  defined  below)  are
presented herein, and reconciled to the generally accepted accounting  principle
("GAAP")  measures of net income and net cash  provided by operating  activities
because  of their wide  acceptance  by the  investment  community  as  financial
indicators of a company's ability to internally fund exploration and development
activities  and to service or incur debt.  The Company  also views the  non-GAAP
measures of EBITDAX and DCF as useful  tools for  comparisons  of the  Company's
financial  indicators  with those of peer  companies  that  follow the full cost
method of accounting.  EBITDAX and DCF should not be considered as  alternatives
to net income or net cash provided by operating activities, as defined by GAAP.



                                                                   Three months ended
                                                                         March 31,
                                                               ---------------------------
                                                                   2006           2005
                                                               -----------     -----------

                                                                         
   Net income                                                  $   543,207     $   84,657
   Depletion, depreciation and amortization                         82,406         73,308
   Impairment of long-lived assets                                     -              152
   Exploration and abandonments                                    124,642         53,829
   Accretion of discount on asset retirement obligations             1,148          1,499
   Interest expense                                                 36,576         32,746
   Income tax provision                                             20,717         21,762
   Loss (gain) on disposition of assets, net                            73         (2,141)
   Discontinued operations                                        (538,142)       125,773
   Current income taxes on discontinued operations                 144,030          2,325
   Commodity hedge related activity                                    508         (3,061)
   Stock-based compensation                                          7,486          5,152
   Amortization of deferred revenue                                (47,949)       (11,625)
   Other noncash items                                               3,714          4,146
                                                                 ---------      ---------
       EBITDAX (a)                                                 378,416        388,522

   Less: Cash interest expense                                     (33,529)       (32,555)
         Current income taxes                                     (147,786)        (8,891)
                                                                 ---------      ---------
       Discretionary cash flow (b)                                 197,101        347,076

   Less: Cash exploration expense                                  (31,571)       (40,170)
         Changes in operating assets and liabilities               137,817         (3,252)
                                                                 ---------      ---------
       Net cash provided by operating activities               $   303,347     $  303,654
                                                                ==========      =========

<FN>
- -------------
(a)  "EBITDAX"   represents   earnings  before   depletion,   depreciation   and
     amortization  expense;  impairment of long-lived  assets;  exploration  and
     abandonments;  accretion  of  discount  on  asset  retirement  obligations;
     interest expense;  income taxes; gain or loss on the disposition of assets;
     noncash  effects from  discontinued  operations;  commodity  hedge  related
     activity;   amortization  of  stock-based  compensation;   amortization  of
     deferred revenue; and other noncash items.
(b)  Discretionary cash flow equals cash flows from operating  activities before
     changes in operating  assets and  liabilities  and before cash  exploration
     expense.
</FN>








                        PIONEER NATURAL RESOURCES COMPANY

                            SUPPLEMENTAL INFORMATION
                                As of May 8, 2006

                         Open Commodity Hedge Positions



                                                            2006
                                          ----------------------------------------
                                          Second      Third     Fourth
                                          Quarter    Quarter    Quarter      Year       2007      2008
                                          --------   --------   --------   --------   --------   ----------

                                                                               
Average Daily Oil Production Hedged:
     Swap Contracts:
     Volume (Bbl)                            5,989      5,000      5,000      5,327     10,000     10,000
     NYMEX price (Bbl)                    $  42.92   $  37.20   $  37.20   $  39.33   $  30.96   $  30.62
     Collar Contracts:
     Volume (Bbl)                            7,000      6,500      6,500      6,665      2,000         -
     NYMEX price (Bbl)
         Ceiling                          $  68.45   $  66.41   $  66.41   $  67.12   $  89.50   $     -
         Floor                            $  42.50   $  41.92   $  41.92   $  42.12   $  50.00   $     -

Average Daily Gas Production Hedged:
     Swap Contracts:
     Volume (MMBtu)                         73,790     73,880     73,984     73,885     24,195         -
     NYMEX price (MMBtu) (a)              $   4.30   $   4.30   $   4.30   $   4.30   $   4.00   $     -
     Collar Contracts:
     Volume (MMBtu)                        105,000    105,000    115,000    108,345    215,000         -
     NYMEX price (MMBtu) (a):
         Ceiling                          $  14.95   $  14.95   $  15.15   $  15.02   $  11.95   $     -
         Floor                            $   6.95   $   6.95   $   6.95   $   6.95   $   6.70   $     -

<FN>
- ---------------
(a) Approximate, based on historical differentials to index prices.
</FN>


Amortization of Volumetric Production Payment Proceeds and Net Derivative Losses
                                 (in thousands)




                                                     2006
                                    ----------------------------------------
                                    Second      Third     Fourth
                                    Quarter    Quarter    Quarter      Year       2007     Thereafter     Total
                                    --------   --------   --------   --------   --------   ----------   ---------

                                                                                   
VPP proceeds, net of
   transaction costs                $ 46,321   $ 45,838   $ 45,527   $137,686   $175,216   $ 460,322    $ 773,224
Net hedge obligations assigned         1,565      1,558      1,569      4,692      6,016      22,957       33,665
                                     -------    -------    -------    -------    -------    --------     --------

Total deferred revenue (a)            47,886     47,396     47,096    142,378    181,232     483,279      806,889
Less net derivative losses to be
   recognized in pretax earnings (b)      30        274       (396)       (92)    (3,540)    (17,117)     (20,749)
                                     -------    -------    -------    -------    -------    --------     --------

Total VPP impact to pretax
    earnings                        $ 47,916   $ 47,670   $ 46,700   $142,286   $177,692   $ 466,162    $ 786,140
                                     =======    =======    =======    =======    =======    ========     ========

<FN>
- --------------
(a)  Deferred  revenue  will be  amortized  as increases to oil and gas revenues
     during the indicated  future periods.
(b)  Represents the remaining pretax earnings impact of the derivatives assigned
     in the VPPs.

</FN>