10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

xQUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2008

or

oTRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from _______ to ________

Commission File Number: 1-13245

PIONEER NATURAL RESOURCES COMPANY

(Exact name of Registrant as specified in its charter)

Delaware	75-2702753
(State or other jurisdiction of   incorporation or organization)	(I.R.S. Employer Identification No.)
5205 N. O'Connor Blvd., Suite 200, Irving, Texas	75039
(Address of principal executive offices)	(Zip Code)

(972) 444-9001

(Registrant's telephone number, including area code)

Not applicable

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the Registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes x No o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of "accelerated filer and large accelerated filer" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x		Accelerated filer	o
Non-accelerated filer	o	(Do not check if a smaller reporting company)	Smaller reporting company	o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes oNo x

Number of shares of Common Stock outstanding as of May 7, 2008 119,541,600

PIONEER NATURAL RESOURCES COMPANY

TABLE OF CONTENTS

	Page
Cautionary Statement Concerning Forward-Looking Statements	3
Definitions of Certain Terms and Conventions Used Herein	4
PART I. FINANCIAL INFORMATION
Item 1. Financial Statements
Consolidated Balance Sheets as of March 31, 2008 and December 31, 2007	5
Consolidated Statements of Operations for the three months ended March 31, 2008 and 2007	7
Consolidated Statement of Stockholders' Equity for the three months ended March 31, 2008	8
Consolidated Statements of Cash Flows for the three months ended March 31, 2008 and 2007	9
Consolidated Statements of Comprehensive Income for the three months ended March 31, 2008 and 2007	10
Notes to Consolidated Financial Statements	11
Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations	34
Item 3. Quantitative and Qualitative Disclosures About Market Risk	48
Item 4. Controls and Procedures	51
PART II. OTHER INFORMATION
Item 1. Legal Proceedings	52
Item 1A. Risk Factors	52
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds	53
Item 5. Other Information	53
Item 6. Exhibits	55
Signatures	56
Exhibit Index	57

2

PIONEER NATURAL RESOURCES COMPANY

Cautionary Statement Concerning Forward-Looking Statements

The information in this Quarterly Report on Form 10-Q (the "Report") contains forward-looking statements that involve risks and uncertainties. When used in this document, the words "believes," "plans," "expects," "anticipates," "intends," "continue," "may," "will," "could," "should," "future," "potential," "estimate," or the negative of such terms and similar expressions as they relate to Pioneer Natural Resources Company ("Pioneer" or the "Company") are intended to identify forward-looking statements. The forward-looking statements are based on the Company's current expectations, assumptions, estimates and projections about the Company and the industry in which the Company operates. Although the Company believes that the expectations and assumptions reflected in the forward-looking statements are reasonable, they involve risks and uncertainties that are difficult to predict and, in many cases, beyond the Company's control.

      These risks and uncertainties include, among other things, volatility of commodity prices, product supply and demand, competition, the ability to obtain environmental and other permits and the timing thereof, other government regulation or action, the ability to obtain approvals from third parties and negotiate agreements with third parties on mutually acceptable terms, international operations and associated international political and economic instability, litigation, the costs and results of drilling and operations, access to and availability of drilling equipment and transportation, processing and refining facilities, 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 and resource potential and the ability to add proved reserves in the future, the assumptions underlying production forecasts, quality of technical data, environmental and weather risks, and acts of war or terrorism. These and other risks are described in the Company's Annual Report on Form 10-K, this and other Quarterly Reports on Form 10-Q and other filings with the Securities and Exchange Commission. In addition, the Company may be subject to currently unforeseen risks that may have a materially adverse impact on it. Accordingly, no assurances can be given that the actual events and results will not be materially different than the anticipated results described in the forward-looking statements. See "Part I, Item 3. Quantitative and Qualitative Disclosures About Market Risk" and "Part II, Item 1A. Risk Factors" in this Report and "Item 1. Business — Competition, Markets and Regulations", "Item 1A. Risk Factors" and "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" in the Company's Annual Report on Form 10-K for the year ended December 31, 2007 for a description of various factors that could materially affect the ability of Pioneer to achieve the anticipated results described in the forward-looking statements. The Company undertakes no duty to publicly update these statements except as required by law.

3

Definitions of Certain Terms and Conventions Used Herein

Within this Report, the following terms and conventions have specific meanings:

• "Bbl" means a standard barrel containing 42 United States gallons.

• "Bcf"means one billion cubic feet and is a measure of natural gas volume.

• "BOE" means a barrel of oil equivalent and is a standard convention used to express oil and gas volumes on a comparable oil equivalent basis. Gas equivalents are determined under the relative energy content method by using the ratio of 6.0 Mcf of gas to 1.0 Bbl of oil or natural gas liquid.

• "BOEPD"means BOE per day.

• "Btu"means British thermal unit, which is a measure of the amount of energy required to raise the temperature of one pound of water one degree Fahrenheit.

• "CBM" means coal bed methane.

• "GAAP" means accounting principles that are generally accepted in the United States of America.

• "IPO" means initial public offering.

• "LIBOR"means London Interbank Offered Rate, which is a market rate of interest.

• "MBbl" means one thousand Bbls.

• "MBOE" means one thousand BOEs.

• "Mcf" means one thousand cubic feet and is a measure of natural gas volume.

• "MMBbl" means one million Bbls.

• "MMBOE"means one million BOEs.

• "MMBtu" means one million Btus.

• "MMcf" means one million cubic feet.

• "MMcfpd" means one million cubic feet per day.

• "NGL"means natural gas liquid.

• "NYMEX" means the New York Mercantile Exchange.

• "Pioneer" or "the Company" means Pioneer Natural Resources Company and its subsidiaries.

• "proved reserves" mean the estimated quantities of crude oil, natural gas and natural gas liquids which geological and engineering data demonstrate with reasonable certainty to be recoverable in future years from known reservoirs under existing economic and operating conditions, i.e., prices and costs as of the date the estimate is made. Prices include consideration of changes in existing prices provided only by contractual arrangements, but not on escalations based upon future conditions.

(i)  Reservoirs are considered proved if economic producibility is supported by either actual production or conclusive formation test. The area of a reservoir considered proved includes (A) that portion delineated by drilling and defined by gas-oil and/or oil-water contacts, if any; and (B) the immediately adjoining portions not yet drilled, but which can be reasonably judged as economically productive on the basis of available geological and engineering data. In the absence of information on fluid contacts, the lowest known structural occurrence of hydrocarbons controls the lower proved limit of the reservoir.

(ii)Reserves which can be produced economically through application of improved recovery techniques (such as fluid injection) are included in the "proved" classification when successful testing by a pilot project, or the operation of an installed program in the reservoir, provides support for the engineering analysis on which the project or program was based.

(iii)Estimates of proved reserves do not include the following: (A) oil that may become available from known reservoirs but is classified separately as "indicated additional reserves"; (B) crude oil, natural gas and natural gas liquids, the recovery of which is subject to reasonable doubt because of uncertainty as to geology, reservoir characteristics or economic factors; (C) crude oil, natural gas and natural gas liquids, that may occur in undrilled prospects; and (D) crude oil, natural gas and natural gas liquids, that may be recovered from oil shales, coal, gilsonite and other such sources.

• "SEC"means the United States Securities and Exchange Commission.

• "VPP" means volumetric production payment.

• "U.S." means United States.

• With respect to information on the working interest in wells, drilling locations and acreage, "net" wells, drilling locations and acres are determined by multiplying "gross" wells, drilling locations and acres by the Company's working interest in such wells, drilling locations or acres. Unless otherwise specified, wells, drilling locations and acreage statistics quoted herein represent gross wells, drilling locations or acres.

• Unless otherwise indicated, all currency amounts are expressed in U.S. dollars.

4

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS

(in thousands)

	March 31,			December 31,
	2008			2007
	(Unaudited)
ASSETS
Current assets:
Cash and cash equivalents	$	17,320		$	12,171
Accounts receivable:
Trade, net of allowance for doubtful accounts of $9,210 and $7,657 as of March 31, 2008 and December 31, 2007, respectively		295,507			283,249
Due from affiliates		375			583
Income taxes receivable		40,121			40,046
Inventories		124,386			97,619
Prepaid expenses		8,567			9,378
Deferred income taxes		163,098			108,073
Other current assets:
Derivatives		—			33,970
Other		39,263			179,966
Total current assets		688,637			765,055
Property, plant and equipment, at cost:
Oil and gas properties, using the successful efforts method of accounting:
Proved properties		9,271,234			8,973,634
Unproved properties		277,283			277,479
Accumulated depletion, depreciation and amortization		(2,130,805	)		(2,028,472	)
Total property, plant and equipment		7,417,712			7,222,641
Deferred income taxes		9,780			10,263
Goodwill		310,861			310,870
Other property and equipment, net		156,411			152,990
Other assets:
Derivatives		—			684
Other, net of allowance for doubtful accounts of $4,550 and $4,573 as of March 31, 2008 and December 31, 2007, respectively		162,566			154,478
	$	8,745,967		$	8,616,981

The financial information included as of March 31, 2008 has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

5

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS (Continued)

(in thousands, except share data)

	March 31,			December 31,
	2008			2007
	(Unaudited)
LIABILITIES AND STOCKHOLDERS' EQUITY
Current liabilities:
Accounts payable:
Trade	$	327,355		$	350,782
Due to affiliates		8,258			27,634
Interest payable		28,685			42,020
Income taxes payable		22,033			12,842
Other current liabilities:
Derivatives		350,990			262,547
Deferred revenue		155,379			158,138
Other		130,651			140,206
Total current liabilities		1,023,351			994,169
Long-term debt		2,803,558			2,755,491
Derivatives		105,127			77,929
Deferred income taxes		1,291,212			1,229,677
Deferred revenue		288,422			325,142
Other liabilities and minority interests		183,393			191,851
Stockholders' equity:
Common stock, $.01 par value; 500,000,000 shares authorized; 124,431,875 and 123,389,014 shares issued at March 31, 2008 and December 31, 2007, respectively		1,244			1,234
Additional paid-in capital		2,704,372			2,693,257
Treasury stock, at cost: 6,229,698 and 5,661,692 shares at March 31, 2008 and December 31, 2007, respectively		(270,593	)		(245,601	)
Retained earnings		933,974			822,089
Accumulated other comprehensive loss - deferred hedge losses, net of tax		(318,093	)		(228,257	)
Total stockholders' equity		3,050,904			3,042,722
Commitments and contingencies
	$	8,745,967		$	8,616,981

The financial information included as of March 31, 2008 has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

6

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except per share data)

(Unaudited)

	Three Months Ended
	March 31,
	2008			2007
Revenues and other income:
Oil and gas	$	558,476		$	353,582
Interest and other		25,024			13,486
Gain on disposition of assets, net		678			251
		584,178			367,319
Costs and expenses:
Oil and gas production		132,647			89,448
Depletion, depreciation and amortization		109,627			78,850
Exploration and abandonments		38,677			71,771
General and administrative		36,481			32,624
Accretion of discount on asset retirement obligations		2,142			1,632
Interest		37,453			28,425
Hurricane activity, net		458			13,548
Other		11,626			8,373
		369,111			324,671
Income from continuing operations before income taxes		215,067			42,648
Income tax provision		(87,267	)		(14,632	)
Income from continuing operations		127,800			28,016
Income from discontinued operations, net of tax		1,940			1,577
Net income	$	129,740		$	29,593
Basic earnings per share:
Income from continuing operations	$	1.08		$	0.23
Income from discontinued operations, net of tax		0.02			0.01
Net income	$	1.10		$	0.24
Diluted earnings per share:
Income from continuing operations	$	1.07		$	0.23
Income from discontinued operations, net of tax		0.02			0.01
Net income	$	1.09		$	0.24
Weighted average shares outstanding:
Basic		117,934			121,523
Diluted		119,092			122,794
Dividends declared per share	$	0.14		$	0.13

The financial information included herein has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

7

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY

(in thousands, except dividends per share)

(Unaudited)

	Shares Outstanding		Common Stock		Additional Paid-in Capital			Treasury Stock			Retained Earnings			Accumulated Other Comprehensive Loss			Total Stockholders' Equity
Balance as of January 1, 2008	117,727		$	1,234	$	2,693,257		$	(245,601	)	$	822,089		$	(228,257	)	$	3,042,722
Dividends declared ($0.14 per share)	—			—		—			—			(16,774	)		—			(16,774	)
Exercise of long-term incentive plan stock options and employee stock purchases	45			—		—			1,958			(1,081	)		—			877
Purchase of treasury stock	(613	)		—		—			(26,950	)		—			—			(26,950	)
Tax benefits related to stock-based compensation	—			—		2,145			—			—			—			2,145
Compensation costs:
Vested compensation awards	1,043			10		(10	)		—			—			—			—
Compensation costs included in net income	—			—		8,980			—			—			—			8,980
Net income	—			—		—			—			129,740			—			129,740
Other comprehensive loss, net of tax:
Net deferred hedge losses	—			—		—			—			—			(140,267	)		(140,267	)
Net hedge losses included in continuing operations	—			—		—			—			—			50,431			50,431
Balance as of March 31, 2008	118,202		$	1,244	$	2,704,372		$	(270,593	)	$	933,974		$	(318,093	)	$	3,050,904

The financial information included herein has been prepared by management without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

8

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(Unaudited)

	Three Months Ended March 31,
	2008			2007
Cash flows from operating activities:
Net income	$	129,740		$	29,593
Adjustments to reconcile net income to net cash provided by operating activities:
Depletion, depreciation and amortization		109,627			78,850
Exploration expenses, including dry holes		3,548			43,418
Hurricane activity		—			19,000
Deferred income taxes		66,164			9,476
Gain on disposition of assets, net		(678	)		(251	)
Accretion of discount on asset retirement obligations		2,142			1,632
Discontinued operations		348			16,442
Interest expense		3,472			4,726
Commodity hedge related activity		7,665			5,899
Amortization of stock-based compensation		8,980			7,738
Amortization of deferred revenue		(39,479	)		(45,034	)
Other noncash items		(4,640	)		(6,283	)
Changes in operating assets and liabilities:
Accounts receivable, net		(14,061	)		(15,227	)
Income taxes receivable		(76	)		12,558
Inventories		(26,172	)		1,989
Prepaid expenses		937			1,156
Other current assets, net		1,995			212
Accounts payable		(33,913	)		(24,590	)
Interest payable		(13,335	)		(3,470	)
Income taxes payable		9,190			6,814
Other current liabilities		(33,772	)		(14,651	)
Net cash provided by operating activities		177,682			129,997
Cash flows from investing activities:
Proceeds from disposition of assets, net of cash sold		132,133			4,765
Additions to oil and gas properties		(297,267	)		(438,647	)
Additions to other assets and other property and equipment, net		(12,406	)		(13,573	)
Net cash used in investing activities		(177,540	)		(447,455	)
Cash flows from financing activities:
Borrowings under long-term debt		592,000			722,000
Principal payments on long-term debt		(545,777	)		(361,555	)
Payments of other liabilities		(5,890	)		(5,755	)
Exercise of long-term incentive plan stock options and employee stock purchase plan		877			2,369
Purchase of treasury stock		(26,950	)		(31,437	)
Excess tax benefits from share-based payment arrangements		2,145			1,540
Payment of financing fees		(11,346	)		(3,519	)
Dividends paid		(52	)		—
Net cash provided by financing activities		5,007			323,643
Net increase in cash and cash equivalents		5,149			6,185
Effect of exchange rate changes on cash and cash equivalents		—			132
Cash and cash equivalents, beginning of period		12,171			7,033
Cash and cash equivalents, end of period	$	17,320		$	13,350

The financial information included herein has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

9

PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

(Unaudited)

	Three Months Ended March 31,
	2008			2007
Net income	$	129,740		$	29,593
Other comprehensive income (loss):
Net hedge activity, net of tax:
Net deferred hedge losses		(140,267	)		(11,075	)
Net hedge losses included in continuing operations		50,431			17,057
Net hedge gains included in discontinued operations		—			(4,712	)
Translation adjustment		—			3,161
Other comprehensive income (loss)		(89,836	)		4,431
Comprehensive income	$	39,904		$	34,024

The financial information included herein has been prepared by management

without audit by independent registered public accountants.

The accompanying notes are an integral part of these consolidated financial statements.

10

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NOTE A. Organization and Nature of Operations

Pioneer is a Delaware corporation whose common stock is listed and traded on the New York Stock Exchange. The Company is a large independent oil and gas exploration and production company with continuing operations in the United States, South Africa and Tunisia.

NOTE B. Basis of Presentation

Presentation. In the opinion of management, the unaudited consolidated financial statements of the Company as of March 31, 2008 and for the three month periods ended March 31, 2008 and 2007 include all adjustments and accruals, consisting only of normal recurring accrual adjustments, which are necessary for a fair presentation of the results for the interim periods. These interim results are not necessarily indicative of results for a full year.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States ("GAAP") have been condensed or omitted in this Form 10-Q pursuant to the rules and regulations of the SEC. These consolidated financial statements should be read in connection with the consolidated financial statements and notes thereto included in the Company's Annual Report on Form 10-K for the year ended December 31, 2007.

Discontinued operations. In November 2007, the Company sold its Canadian subsidiaries. In accordance with Statement of Financial Accounting Standards ("SFAS") No. 144, "Accounting for the Impairment or Disposal of Long-Lived Assets" ("SFAS 144"), the Company has reflected the results of operations of this divestiture as discontinued operations, rather than as a component of continuing operations. See Note Q for additional information regarding discontinued operations.

Inventories. Inventories consisted of $120.8 million and $94.3 million of materials and supplies and $3.6 million and $3.3 million of commodities as of March 31, 2008 and December 31, 2007, respectively. The Company's materials and supplies inventory is primarily comprised of oil and gas drilling or repair items, such as tubing, casing, chemicals, operating supplies and ordinary maintenance materials and parts. The materials and supplies inventory is primarily acquired for use in future drilling operations or repair operations and is carried at the lower of cost or market, on a first-in, first-out basis. Commodities inventory is carried at the lower of average cost or market, on a first-in, first-out basis. Any impairments of inventory are reflected in gain (loss) on disposition of assets in the Consolidated Statements of Operations. As of March 31, 2008 and December 31, 2007, the Company's materials and supplies inventory was net of $300 thousand and $1.1 million, respectively, of valuation reserve allowances.

Goodwill. In accordance with SFAS No. 142, "Goodwill and Other Intangible Assets", goodwill is not amortized to earnings, but is assessed for impairment whenever events or circumstances indicate that impairment of the carrying value of goodwill is likely, but no less often than annually. If the carrying value of goodwill is determined to be impaired, it is reduced for the impaired value with a corresponding charge to pretax earnings in the period in which it is determined to be impaired. During the third quarter of 2007, the Company performed its annual assessment of goodwill impairment and determined that there was no impairment.

Minority interests in consolidated subsidiaries. The Company owns the majority interests in certain subsidiaries with operations in the United States. The Company has recognized minority interests in consolidated subsidiaries of $12.7 million and $11.9 million in other liabilities and minority interests in the Consolidated Balance Sheets as of March 31, 2008 and December 31, 2007, respectively.

During the third quarter of 2007, the Company disposed of its interest in a majority-owned Nigerian subsidiary. Minority interests in the net losses associated with the previously owned Nigerian subsidiary totaled $2.1 million for the three months ended March 31, 2007 and are included in other income in the Consolidated Statement of Operations of that period. Minority interests in the net income of the Company's consolidated United

11

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

States subsidiaries totaled $738 thousand and $692 thousand for the three month periods ended March 31, 2008 and 2007, respectively, and are included in other expense in the Consolidated Statements of Operations.

Stock-based compensation. For stock-based compensation awards, compensation expense, based on the fair value on the date of grant, is being recognized in the Company's financial statements over the vesting period. The Company utilizes (a) the Black-Scholes option pricing model to measure the fair value of stock options, (b) the stock price on the date of grant for the fair value of restricted stock awards and (c) the Monte Carlo simulation method for the fair value of performance unit awards.

For the three month periods ended March 31, 2008 and 2007, the Company recorded $9.0 million and $7.7 million, respectively, of stock-based compensation costs for all plans.

In accordance with GAAP, the Company's issued shares, as reflected in the Consolidated Balance Sheets at March 31, 2008 and December 31, 2007, do not include 1,261,544 shares and 1,960,475 shares, respectively, related to unvested stock-based compensation awards. During the three months ended March 31, 2008, awards, lapses and forfeitures of stock-based compensation totaled 1,050,680, 1,042,861 and 41,079 units, respectively. Restrictions on 1,038,987 of the remaining stock-based awards will lapse in future periods.

As of March 31, 2008, there was approximately $70.8 million of unrecognized compensation expense related to unvested share-based compensation plan awards, primarily related to restricted stock and performance unit awards. This compensation will be recognized over the remaining vesting periods, which on a weighted average basis is approximately 23 months.

New accounting pronouncements. In September 2006, the FASB issued SFAS No. 157, "Fair Value Measures" ("SFAS 157"). SFAS 157 defines fair value, establishes a framework for measuring fair value and enhances disclosures about fair value measures required under other accounting pronouncements, but does not change existing guidance as to whether or not an instrument is carried at fair value. During February 2008, the FASB issued FASB Staff Position No. 157-2, "FSP FAS 157-2" ("FSP FAS 157-2"). FSP FAS 157-2 delays the effective date of SFAS 157 for nonfinancial assets and nonfinancial liabilities until fiscal years beginning after November 15, 2008, except for items that are recognized or disclosed at fair value in the financial statements on a recurring basis at least annually. On January 1, 2008, the Company adopted the provisions of SFAS 157 as they pertain to financial assets and liabilities. See Note D for additional information regarding the Company's adoption of SFAS 157. The adoption of the provisions of SFAS 157 that were delayed by FSP FAS 157-2 is not expected to have a material effect on the financial condition or results of operations of the Company.

In February 2007, the FASB issued SFAS No. 159, "The Fair Value Option for Financial Assets and Financial Liabilities" ("SFAS 159"). SFAS 159 permits entities to measure many financial instruments and certain other items at fair value that are not currently required to be measured at fair value. The Company adopted the provisions of SFAS 159 on January 1, 2008 and its implementation did not have a material effect on the financial condition or results of operations of the Company.

In December 2007, the FASB issued SFAS No. 141(R), "Business Combinations" ("SFAS 141"). SFAS 141(R) replaces SFAS 141 and provides greater consistency in the accounting and financial reporting of business combinations. SFAS 141(R) requires the acquiring entity in a business combination to recognize all assets acquired and liabilities assumed in the transaction and any noncontrolling interest in the acquiree at the acquisition date, measured at the fair value as of that date. This includes the measurement of the acquirer shares issued in consideration for a business combination, the recognition of contingent consideration, the accounting for pre-acquisition gain and loss contingencies, the recognition of capitalized in-process research and development, the accounting for acquisition-related restructuring cost accruals, the treatment of acquisition related transaction costs and the recognition of changes in the acquirer's income tax valuation allowance and deferred taxes. SFAS 141(R) is effective for fiscal years and interim periods within those fiscal years, beginning on or after December 15, 2008, and is to be applied prospectively as of the beginning of the fiscal year in which the statement is applied. The implementation of SFAS 141(R) is not expected to have a material effect on the financial condition or results of operations of the Company.

12

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

In December 2007, the FASB issued SFAS No. 160 "Noncontrolling Interest in Consolidated Financial Statements, an amendment of ARB Statement No. 51" ("SFAS 160"). SFAS 160 amends Accounting Research Bulletin ("ARB") No. 51, "Consolidated Financial Statements," to establish accounting and reporting standards for the noncontrolling interest in a subsidiary and for the deconsolidation of a subsidiary. SFAS 160 clarifies that a noncontrolling interest in a subsidiary, which is sometimes referred to as minority interest, is an ownership interest in the consolidated entity that should be reported as a component of equity in the consolidated financial statements. Among other requirements, SFAS 160 requires consolidated net income to be reported at amounts that include the amounts attributable to both the parent and the noncontrolling interest. It also requires disclosure of the amounts of consolidated net income attributable to the parent and to the non-controlling interest on the face of the consolidated income statement. SFAS 160 is effective for the Company on January 1, 2009 and is not expected to have a significant impact on the Company's financial statements.

In March 2008, the FASB issued SFAS No. 161, "Disclosures about Derivative Instruments and Hedging Activities – an amendment of FASB Statement No. 133" ("SFAS 161"). SFAS 161 changes the disclosure requirements for derivative instruments and hedging activities by requiring entities to provide enhanced disclosures about (a) how and why an entity uses derivative instruments, (b) how derivative instruments and related hedged items are accounted for under SFAS 133, "Accounting for Derivative Instruments and Hedging Activities" and its related interpretations, and (c) how derivative instruments and related hedged items affect an entity's financial position, financial performance, and cash flows. SFAS 161 is effective for the Company on January 1, 2009 and is not expected to have a material effect on the financial condition or results of operations of the Company.

On May 9, 2008, the FASB issued FASB Staff Position No. APB 14-1, "Accounting for Convertible Debt Instruments That May Be Settled in Cash upon Conversion (Including Partial Cash Settlement)" ("FSP APB 14-1"). FSP APB 14-1 specifies that issuers of such instruments should separately account for the liability and equity components in a manner that will reflect the entity's nonconvertible debt borrowing rate when interest cost is recognized in subsequent periods.  FSP APB 14-1 is effective for financial statements issued for fiscal years beginning after December 15, 2008.  The Company is assessing the effect that FSP APB 14-1 will have on its financial condition and results of operations.

NOTE C. Exploratory Well Costs

The Company capitalizes exploratory well costs until a determination is made that the well has either found proved reserves or that it is impaired. The capitalized exploratory well costs are presented in proved properties in the Consolidated Balance Sheets. If the exploratory well is determined to be impaired, the well costs are charged to exploration and abandonments expenses.

The following table reflects the Company's capitalized exploratory well activity during the three months ended March 31, 2008:

	Three Months Ended
	March 31, 2008
	(in thousands)
Beginning capitalized exploratory well costs	$	130,630
Additions to exploratory well costs pending the determination of proved reserves		77,882
Reclassification due to determination of proved reserves		(55,443	)
Exploratory well costs charged to exploration expense		(2,863	)
Ending capitalized exploratory well costs	$	150,206

13

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

         The following table provides an aging, as of March 31, 2008 and December 31, 2007, of capitalized exploratory well costs based on the date drilling was completed and the number of projects for which exploratory well costs have been capitalized for a period greater than one year since the date drilling was completed:

	March 31,		December 31,
	2008		2007
	(in thousands, except well counts)
Capitalized exploratory well costs that have been capitalized:
One year or less	$	93,848	$	76,237
Greater than one year		56,358		54,393
	$	150,206	$	130,630
Number of projects with exploratory well costs that have been capitalized for a period greater than one year		7		8

The following table provides an aging of capitalized costs of exploration projects that have been suspended for more than one year as of March 31, 2008:

	Total		2008		2007			2006		2005
	(in thousands)
United States:
Lay Creek	$	42,853	$	1,350	$	10,243		$	31,260	$	—
Other		8,584		440		1,586			5,843		715
Other foreign		4,921		991		(15	)		3,945		—
Total	$	56,358	$	2,781	$	11,814		$	41,048	$	715

Lay Creek. The Company's Lay Creek project is a coal bed methane pilot program located in northwestern Colorado. The Company has drilled 18 wells in six separate pilot areas and completed workovers and recompletions on 14 wells drilled by a previous operator. The Company completed the water treatment facilities and plans to initiate sales of production in the second quarter of 2008. Determination of success of the pilot project is dependent on the ability to dewater the formation and determine if commercial quantities of gas can be produced. The pilot project is currently in the dewatering phase and if the pilot project is successful then full field development could begin in 2009.

NOTE D. Disclosures About Fair Value Measurements

Effective January 1, 2008, the Company adopted the provisions of SFAS 157 for which delayed adoption is not provided under FSP FAS 157-1. SFAS 157 retains the exchange price notion in the definition of fair value but clarifies that the exchange price is the price in an orderly transaction between market participants to sell an asset or transfer a liability in the principal or most advantageous market in which the reporting company would transact for the asset or liability.

The SFAS 157 valuation framework is based upon inputs that market participants use in pricing an asset or liability, which are classified into two categories: observable inputs and unobservable inputs. Observable inputs represent market data obtained from independent sources, whereas unobservable inputs reflect a company's own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. These two types of inputs are further prioritized into the following fair value input hierarchy:

14

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

• Level 1 – quoted prices for identical assets or liabilities in active markets.

• Level 2 – quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g. interest rates); and inputs derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 – unobservable inputs for the asset or liability.

The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety. The following table presents the Company's financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2008 for each of the fair value input hierarchy levels:

	Fair Value Measurements at Reporting Date Using
	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Fair Value at March 31, 2008
		(in thousands)
Assets:
Trading securities	$	486	$	76	$	—	$	562
Deferred compensation plan assets		22,595		—		—		22,595
Total assets	$	23,081	$	76	$	—	$	23,157
Liabilities:
Commodity derivative obligations	$	—	$	452,716	$	—	$	452,716
Interest rate derivative obligations		—		3,401		—		3,401
Total liabilities	$	—	$	456,117	$	—	$	456,117

Trading securities and deferred compensation plan assets. The Company's trading securities represent equity securities that are actively traded on major exchange markets and trading securities that are not actively traded on major exchange markets. The Company's deferred compensation plan assets represent investments in equity and mutual fund securities that are actively traded on major exchange markets plus unallocated contributions as of the measurement date. As of March 31, 2008, all significant inputs to these asset exchange values represented Level 1 independent active exchange market price inputs except inputs for trading securities that are not actively traded on major exchange markets, which were provided by broker quotes representing Level 2 inputs.

Commodity derivative obligations. The Company's commodity derivative obligations represent oil, NGL and gas swap and collar contracts. All of the Company's commodity price obligation measurements represent Level 2 inputs in the hierarchy priority.

Oil derivatives. The Company's oil derivatives are swap and collar contracts for notional Bbls of oil at fixed (in the case of swaps contracts) or interval (in the case of collar contracts) NYMEX West Texas Intermediate ("WTI") oil prices. The liability transfer values attributable to the Company's oil derivative obligations as of March 31, 2008 are based on (i) the contracted notional volumes, (ii) independent active NYMEX futures price quotes for WTI oil, (iii) the Company's estimated credit-adjusted risk-free rate yield curve and (iv) the implied rate of volatility inherent in the collar contracts. The Company's credit-adjusted risk-free rate is based on an independent rating agency-supplied global default rate curve for the Company's debt rating category plus the United States Treasury Bill yield curve as of March 31, 2008. The implied rates of volatility inherent in the Company's collar contracts were determined based on implied volatility factors provided by the derivative counterparties, adjusted for estimated volatility skews. The volatility factors are not considered significant to the fair values of the collar contracts since intrinsic and time values are the principal components of the collar values.

15

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NGL derivatives. The Company's NGL derivatives are swap contracts for notional blended Bbls of Mont Belvieu-posted-price NGLs. The liability transfer values attributable to the Company's NGL derivative obligations as of March 31, 2008 are based on (i) the contracted notional volumes, (ii) independent broker-supplied forward Mont Belvieu-posted-price quotes and (iii) the Company's credit-adjusted risk-free rate yield curve.

Gas derivatives. The Company's gas derivatives are swap contracts for notional MMBtus of gas contracted at various posted price indexes, including NYMEX Henry Hub ("HH") swap contracts coupled with basis swaps contracts that convert the HH price index point to other price indexes. The liability transfer values attributable to the Company's gas derivative obligations as of March 31, 2008 are based on (i) the contracted notional volumes, (ii) independent active NYMEX futures price quotes for HH gas, (iii) averages of forward posted price quotes supplied by independent brokers who are active in buying and selling gas derivatives at the indexes other than HH and (iv) the Company's credit-adjusted risk-free rate yield curve.

The Company corroborated independent broker-supplied forward price quotes by comparing price quote samples to alternate observable market data.

Interest rate derivative obligations. The Company's interest rate derivative obligations represent swap contracts for $400 million notional amount of debt, whereby the Company pays a fixed rate of interest and the counterparty receives a variable LIBOR-based rate. The liability transfer values attributable to the Company's interest rate derivative obligations as of March 31, 2008 are based on (i) the contracted notional amounts, (ii) forward active market-quoted LIBOR rate yield curves and (iii) the Company's credit-adjusted risk-free rate yield curve. The Company's interest rate derivative obligation measurements represent Level 2 inputs in the hierarchy priority.

NOTE E. Income Taxes

The Company accounts for income taxes in accordance with the provisions of SFAS No. 109, "Accounting for Income Taxes" ("SFAS 109"). SFAS 109 requires that the Company continually assess both positive and negative evidence to determine whether it is more likely than not that deferred tax assets can be realized prior to their expiration. Pioneer monitors Company-specific, oil and gas industry and worldwide economic factors to assess the likelihood that the Company's net operating loss carryforwards ("NOLs") and other deferred tax attributes in the U.S. federal and state, local and foreign tax jurisdictions will be utilized prior to their expiration. As of March 31, 2008 and December 31, 2007, the Company's valuation allowances (relating primarily to foreign tax jurisdictions) were $28.4 million and $24.8 million, respectively.

The Company adopted the provisions of FASB Interpretation No. 48, "Accounting for Uncertainty in Income Taxes" ("FIN 48") on January 1, 2007. FIN 48 clarifies the accounting for uncertainty in income taxes recognized and prescribes a recognition threshold and measurement methodology for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. As of March 31, 2008, the Company had no unrecognized tax benefits (as defined in FIN 48). In connection with the adoption of FIN 48, the Company established a policy to account for (a) interest charges with respect to income taxes as interest expense and (b) penalties as other expense in the Consolidated Statements of Operations. The Company files income tax returns in the U.S. federal and various state and foreign jurisdictions. With few exceptions, the Company believes that it is no longer subject to examinations by tax authorities for years before 2003. As of March 31, 2008, no adjustments had been proposed in any jurisdiction that would have a significant effect on the Company's future results of operations or financial position.

Pursuant to Accounting Principles Board ("APB") Opinion No. 23 "Accounting for Income Taxes – Special Areas", the Company historically treated the undistributed earnings in South Africa as permanently reinvested and did not provide for a U.S. tax on such earnings. During the second quarter of 2007, the Company made the determination that it no longer had identifiable plans to reinvest these earnings in South Africa and accordingly began recording deferred tax expense. The Company recorded $4.9 million of U.S. income taxes in the first quarter of 2008 for the results of operations of its South African subsidiaries.

16

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

Income tax (provisions) benefits. The Company's income tax (provisions) benefits attributable to income from continuing operations consisted of the following for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended
	March 31,
	2008			2007
	(in thousands)
Current:
U.S. federal	$	(5,420	)	$	4,776
U.S. state and local		(911	)		—
Foreign		(14,772	)		(9,932	)
		(21,103	)		(5,156	)
Deferred:
U.S. federal		(62,207	)		(14,653	)
U.S. state and local		2,429			(491	)
Foreign		(6,386	)		5,668
		(66,164	)		(9,476	)
	$	(87,267	)	$	(14,632	)

Discontinued operations. The Company's income tax (provisions) benefits attributable to income from discontinued operations consisted of the following for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended
	March 31,
	2008			2007
	(in thousands)
Current - foreign	$	(519	)	$	(4,494	)
Deferred - foreign		792			965
	$	273		$	(3,529	)

17

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NOTE F.       Long-term Debt

Lines of credit. During April 2007, the Company entered into an Amended and Restated 5-Year Revolving Credit Agreement (the "Credit Facility") that matures in April 2012, unless extended in accordance with the terms of the Credit Facility. The Credit Facility also provides for initial aggregate loan commitments of $1.5 billion, which may be increased to a maximum aggregate amount of $2.0 billion if the lenders increase their loan commitments or if loan commitments of new financial institutions are added. As of March 31, 2008, the Company had $663 million of outstanding borrowings under the Credit Facility and had $45.8 million of undrawn letters of credit, all of which were undrawn commitments under the Credit Facility, leaving the Company with $791.2 million of unused borrowing capacity under the Credit Facility.

Senior Notes. On January 15, 2008, $3.8 million principal amount of the Company's 6.50% senior notes matured and were paid.

Senior convertible notes. During January 2008, the Company issued $500 million principal amount of 2.875% convertible senior notes due 2038 (the "2.875% Senior Convertible Notes") and received proceeds, net of approximately $11.3 million of underwriter discounts and offering costs, of approximately $488.7 million. The Company used the net proceeds from the offering to reduce outstanding borrowings under the Credit Facility.

The 2.875% Senior Convertible Notes will be convertible under certain circumstances, using a net share settlement process, into a combination of cash and the Company's common stock pursuant to a formula. The initial base conversion price is approximately $72.60 per share (subject to adjustment in certain circumstances), which is equivalent to an initial base conversion rate of 13.7741 common shares per $1,000 principal amount of convertible notes. In general, upon conversion of a note, the holder of such note will receive cash equal to the principal amount of the note and the Company's common stock for the note's conversion value in excess of such principal amount. If at the time of conversion the applicable price of the Company's common stock exceeds the base conversion price, holders will receive up to an additional 8.9532 shares of the Company's common stock per $1,000 principal amount of notes, limited to a maximum of 22.7273 shares per $1,000 principal amount of notes, as determined pursuant to a specified formula.

The 2.875% Senior Convertible Notes mature on January 15, 2038 (the "Maturity Date"). The Company may redeem the 2.875% Senior Convertible Notes for cash at any time on or after January 15, 2013 at a price equal to 100 percent of the principal amount plus accrued and unpaid interest. Holders of the 2.875% Senior Convertible Notes may require the Company to purchase their 2.875% Senior Convertible Notes for cash at a price equal to 100 percent of the principal amount plus accrued and unpaid interest if certain defined fundamental changes occur, as defined in the agreement, or on January 15, 2013, 2018, 2023, 2028 or 2033. Additionally, holders may convert their notes at their option in the following circumstances:

• Following defined periods during which the reported sales price of the Company's common stock exceeds 130 percent of the base conversion price (initially $72.60 per share);

• During five-day periods following defined circumstances when the trading price of the 2.875% Senior Convertible Notes is less than 97 percent of the price of the Company's common stock times a defined conversion rate;

• Upon notice of redemption by the Company; and

• During the period beginning October 15, 2037, and ending at the close of business on the business day immediately preceding the Maturity Date.

Interest on the principal amount of the 2.875% Senior Convertible Notes is payable semiannually in arrears on January 15 and July 15 of each year, beginning July 15, 2008. Beginning on January 15, 2013, during any six-month period thereafter from January 15 to July 14 and from July 15 to January 14, if the average trading day price of a 2.875% Senior Convertible Note for the five consecutive trading days immediately preceding the first day of the applicable six-month interest period equals or exceeds $1,200, interest on the principal amount of the 2.875% Senior Convertible Notes will be 2.375% solely for the relevant interest period.

18

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NOTE G.     Derivative Financial Instruments

The Company uses financial derivative contracts to manage exposures to commodity price, interest rate and foreign currency fluctuations. The Company generally does not enter into derivative financial instruments for speculative or trading purposes. The Company also may enter into physical delivery contracts that effectively provide commodity price hedges. Because physical delivery contracts are not expected to be net cash settled, they are considered to be normal sales contracts and not derivatives. Therefore, physical delivery contracts are not recorded in the financial statements.

All derivatives are recorded in the balance sheet at estimated fair value. Fair value is generally determined based on the difference between the fixed contract price and the underlying market price at the determination date. Changes in the fair value of effective cash flow hedges are recorded as a component of accumulated other comprehensive loss – deferred hedge losses, net of tax ("AOCI – Hedging"), which is later transferred to earnings when the hedged transaction occurs. Changes in the fair value of derivatives that are not designated as hedges, as well as the ineffective portion of the hedge derivatives, are recorded in earnings. The ineffective portion is calculated as the difference between the change in fair value of the derivative and the estimated change in cash flows from the item hedged.

Fair value hedges. The Company monitors the debt capital markets and interest rate trends to identify opportunities to enter into and terminate interest rate derivative contracts with the objective of reducing its costs of capital. As of March 31, 2008 and December 31, 2007, the Company was not a party to any open fair value hedges.

As of March 31, 2008, the carrying value of the Company's long-term debt in the Consolidated Balance Sheets included a $3.1 million reduction attributable to net deferred interest rate hedge losses on terminated fair value hedges that are being amortized as increases to interest expense over the original terms of the terminated agreements. During the three-month periods ended March 31, 2008 and 2007, the Company's amortization of deferred hedge losses and gains on terminated interest rate swaps increased the Company's reported interest expense by $118 thousand and $73 thousand, respectively.

The following table sets forth, as of March 31, 2008, the scheduled amortization of net deferred hedge losses on terminated interest rate hedges (including terminated fair value and cash flow hedges) that will be recognized as increases to the Company's future interest expense:

	Net deferred interest rate hedge losses
	Fair Value		Cash Flow		Total
	(in thousands)
2008	$	195	$	176	$	371
2009	$	281	$	260	$	541
2010	$	307	$	293	$	600
2011	$	337	$	328	$	665
2012	$	369	$	366	$	735
Thereafter	$	1,609	$	1,594	$	3,203

Cash flow hedges. The Company utilizes commodity swap and collar contracts to (i) reduce the impact on the Company's results of operations from the price volatility of the commodities the Company produces and sells, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. As of March 31, 2008, all of the Company's open commodity hedges are hedges of United States forecasted sales. The Company also, from time to time, utilizes interest rate contracts to reduce the effect of interest rate volatility on the Company's indebtedness.

19

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

Oil prices. All material physical sales contracts governing the Company's oil production have been tied directly or indirectly to NYMEX prices. The following table sets forth the volumes hedged in Bbls under outstanding oil hedge contracts and the weighted average NYMEX prices per Bbl for those contracts as of March 31, 2008:

	First		Second		Third		Fourth		Outstanding
	Quarter		Quarter		Quarter		Quarter		Average
Average daily oil production hedged:
2008 – Collar Contracts
Volume (Bbl)				3,000		3,000		3,000		3,000
Price per Bbl			$	65.00-$80.80	$	65.00-$80.80	$	65.00-$80.80	$	65.00-$80.80
2008 – Swap Contracts
Volume (Bbl)				15,000		15,000		15,000		15,000
Price per Bbl			$	65.46	$	65.46	$	65.46	$	65.46
2009 – Collar Contracts
Volume (Bbl)		2,000		2,000		2,000		2,000		2,000
Price per Bbl	$	65.00-$76.50	$	65.00-$76.50	$	65.00-$76.50	$	65.00-$76.50	$	65.00-$76.50
2009 – Swap Contracts
Volume (Bbl)		8,000		8,000		8,000		8,000		8,000
Price per Bbl	$	79.43	$	79.43	$	79.43	$	79.43	$	79.43
2010 – Swap Contracts
Volume (Bbl)		4,000		4,000		4,000		4,000		4,000
Price per Bbl	$	85.21	$	85.21	$	85.21	$	85.21	$	85.21

The Company reports average oil prices per Bbl including the effects of oil quality adjustments, amortization of deferred volumetric production payment ("VPP") revenue and the net effect of oil hedges. The following table sets forth (i) the Company's oil prices from continuing operations, both reported (including hedge results and amortization of deferred VPP revenue) and realized (excluding hedge results and amortization of deferred VPP revenue), (ii) amortization of deferred VPP revenue to oil revenue from continuing operations and (iii) the net effect of oil price hedges on oil revenue from continuing operations for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008		2007
Average price reported per Bbl	$	77.41	$	54.18
Average price realized per Bbl	$	98.26	$	56.73
VPP increase to oil revenue (in millions)	$	26.0	$	27.3
Decrease to oil revenue from hedging activity (in millions)	$	79.4	$	33.1

20

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

Natural gas liquids prices. All material physical sales contracts governing the Company's NGL production have been tied directly or indirectly to Mont Belvieu prices. The following table sets forth the volumes hedged in Bbls under outstanding NGL hedge contracts and the weighted average Mont Belvieu prices per Bbl for those contracts as of March 31, 2008:

	First		Second		Third		Fourth		Outstanding
	Quarter		Quarter		Quarter		Quarter		Average
Average daily NGL production hedged:
2008 – Swap Contracts
Volume (Bbl)				1,000		1,000		1,000		1,000
Price per Bbl			$	50.74	$	50.74	$	50.74	$	50.74
2009 – Swap Contracts
Volume (Bbl)		1,000		1,000		1,000		1,000		1,000
Price per Bbl	$	47.41	$	47.41	$	47.41	$	47.41	$	47.41
2010 – Swap Contracts
Volume (Bbl)		1,000		1,000		1,000		1,000		1,000
Price per Bbl	$	46.15	$	46.15	$	46.15	$	46.15	$	46.15

The Company reports average NGL prices per Bbl including the effects of NGL quality adjustments and the net effect of NGL hedges. The following table sets forth (i) the Company's NGL prices from continuing operations, both reported (including hedge results) and realized (excluding hedge results) and (iii) the net effect of NGL price hedges on NGL revenue from continuing operations for the three-month period ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008		2007
Average price reported per Bbl	$	53.89	$	31.68
Average price realized per Bbl	$	54.28	$	31.68
Decrease to NGL revenue from hedging activity (in millions)	$	0.7	$	—

21

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

Gas prices. The Company employs a policy of hedging a portion of its gas production based on the index price upon which the gas is actually sold in order to mitigate the basis risk between NYMEX prices and actual index prices, or based on NYMEX prices if NYMEX prices are highly correlated with the index price. The following table sets forth the volumes hedged in MMBtus under outstanding gas hedge contracts and the weighted average index prices per MMBtu for those contracts as of March 31, 2008:

	First		Second		Third		Fourth		Outstanding
	Quarter		Quarter		Quarter		Quarter		Average
Average daily gas production hedged:
2008 – Swap Contracts
Volume (MMbtu)				215,000		215,000		201,739		210,564
Price per MMBtu			$	7.41	$	7.41	$	7.45	$	7.42
2009 – Swap Contracts
Volume (MMbtu)		65,000		5,000		5,000		5,000		19,795
Price per MMBtu	$	8.64	$	8.04	$	8.04	$	8.04	$	8.53
2010 – Swap Contracts
Volume (MMbtu)		5,000		5,000		5,000		5,000		5,000
Price per MMBtu	$	7.73	$	7.73	$	7.73	$	7.73	$	7.73

The Company reports average gas prices per Mcf including the effects of Btu content, gas processing, shrinkage adjustments, amortization of deferred VPP revenue and the net effect of gas hedges. The following table sets forth (i) the Company's gas prices from continuing operations, both reported (including hedge results and amortization of deferred VPP revenue) and realized (excluding hedge results and amortization of deferred VPP revenue), (ii) amortization of deferred VPP revenue to gas revenue from continuing operations and (iii) the net effect of gas price hedges on gas revenue from continuing operations for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008			2007
Average price reported per Mcf	$	7.74		$	7.17
Average price realized per Mcf	$	7.36		$	6.24
VPP increase to gas revenue (in millions)	$	13.4		$	17.7
Increase (decrease) to gas revenue from hedging activity (in millions) (a)	$	(0.5	)	$	6.1

_____________

(a) Excludes hedge gains of $6.9 million attributable to discontinued operations for the three months ended March 31, 2007.

Interest rate. During January 2008, the Company entered into interest rate swap contracts and designated the contracts as cash flow hedges of the forecasted interest rate risk associated with a portion of the Company's Credit Facility indebtedness. The interest rate swap contracts are variable-for-fixed-rate swaps on $400 million notional amount of debt at a weighted average fixed annual rate of 2.87 percent, excluding any applicable margins. The interest rate swaps have an effective start date of February 2008, with $200 million terminating during February 2010 and $200 million during February 2011. The Company did not realize any ineffectiveness in connection with the interest rate swap contracts.

22

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

Hedge ineffectiveness. During the three months ended March 31, 2008, the Company recorded net ineffectiveness income of $1.0 million, as compared to net ineffectiveness charges of $.9 million during the three months ended March 31, 2007. Hedge ineffectiveness represents the ineffective portions of changes in fair values of the Company's cash flow hedging instruments.  The primary causes of changes in ineffectiveness are changes in correlations and derivative fair values associated with commodity price indexes of financial hedge derivatives and the commodity price indexes of the hedged forecasted production for certain fields.

AOCI - Hedging. As of March 31, 2008 and December 31, 2007, AOCI - Hedging represented net deferred losses of $318.1 million and $228.3 million, respectively. The AOCI - Hedging balance as of March 31, 2008 was comprised of $359.4 million of net deferred losses on the effective portions of open cash flow hedges, $144.2 million of net deferred losses on terminated cash flow hedges (including $3.0 million of net deferred losses on terminated cash flow interest rate hedges) and $185.5 million of associated net deferred tax benefits. The increase in AOCI - Hedging during the three months ended March 31, 2008 was primarily attributable to increases in future oil, NGL and gas prices relative to the commodity prices stipulated in the hedge contracts, partially offset by the reclassification of net deferred hedge losses to net income as derivatives matured. Decreases in forward interest rate yield curves also increased the Company's AOCI – Hedging attributable to the Company's interest rate swap contracts. The net deferred losses associated with open cash flow hedges remain subject to market price fluctuations until the positions are either settled under the terms of the hedge contracts or terminated prior to settlement. The net deferred losses on terminated cash flow hedges are fixed.

During the twelve months ending March 31, 2009, based on current estimates of future commodity prices and interest rates, the Company expects to reclassify approximately $280.5 million of net deferred losses associated with open commodity hedges and $97.7 million of net deferred losses on terminated commodity and interest rate hedges from AOCI - Hedging to oil and gas revenues and interest expense. The Company also expects to reclassify approximately $139.9 million of net deferred income tax benefits associated with commodity and interest rate hedges during the twelve months ending March 31, 2009 from AOCI - Hedging to income tax benefit.

Terminated commodity hedges. At times, the Company terminates open commodity hedge positions when the underlying commodity prices reach a point that the Company believes will be the high or low price of the commodity prior to the scheduled settlement of the open commodity hedge position. This allows the Company to maximize gains or minimize losses associated with the open hedge positions. At the time of termination of the hedges, the amounts are recorded in AOCI – Hedging and amortized to earnings over the periods the production was scheduled to occur.

The following table sets forth, as of March 31, 2008, the scheduled amortization of net deferred losses on terminated commodity hedges that will be recognized as decreases to the Company's future oil and gas revenues:

	First		Second		Third		Fourth
	Quarter		Quarter		Quarter		Quarter		Total
	(in thousands)
2008 net deferred hedge losses			$	30,011	$	29,885	$	30,076	$	89,972
2009 net deferred hedge losses	$	7,488	$	5,412	$	5,432	$	5,990	$	24,322
2010 net deferred hedge losses	$	5,101	$	5,069	$	5,042	$	4,978	$	20,190
2011 net deferred hedge losses	$	873	$	889	$	902	$	906	$	3,570
2012 net deferred hedge losses	$	810	$	791	$	783	$	772	$	3,156

23

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NOTE H.     Asset Retirement Obligations

The Company's asset retirement obligations primarily relate to the future plugging and abandonment of wells and related facilities. The Company does not provide for a market risk premium associated with asset retirement obligations because a reliable estimate cannot be determined. The Company has no assets that are legally restricted for purposes of settling asset retirement obligations. The following table summarizes the Company's asset retirement obligation transactions during the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended
	March 31,
	2008			2007
	(in thousands)
Beginning asset retirement obligations	$	208,184		$	225,913
New wells placed on production and changes in estimates (a)		(8,422	)		22,682
Liabilities settled		(1,533	)		(17,803	)
Accretion of discount on continuing operations		2,142			1,632
Accretion of discount on discontinued operations		—			426
Currency translation		—			257
Ending asset retirement obligation	$	200,371		$	233,107

_____________

(a) During the three months ended March 31, 2008, the Company recorded $9.0 million decreases in the abandonment estimates and associated insurance recovery estimates for the East Cameron facility that was destroyed by Hurricane Rita in 2005.  During the three months ended March 31, 2007, the Company recorded a $19.0 million increase to the abandonment estimates for the East Cameron facility, which is reflected in hurricane activity, net in the Consolidated Statement of Operations for the period then ended. For additional information, see Note O.

The Company records the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities and minority interests, respectively, in the Consolidated Balance Sheets. As of March 31, 2008 and December 31, 2007, the current portion of the Company's asset retirement obligations amounted to $77.4 million and $86.9 million, respectively.

NOTE I. Postretirement Benefit Obligations

As of March 31, 2008 and December 31, 2007, the Company had recorded $10.4 million and $10.5 million, respectively, of unfunded accumulated postretirement benefit obligations, the current and noncurrent portions of which are included in other current liabilities and other liabilities and minority interests, respectively, in the Consolidated Balance Sheets. These obligations are comprised of five plans of which four relate to predecessor entities that the Company acquired in prior years. These plans had no assets as of March 31, 2008 or December 31, 2007. Other than the Company's retirement plan, the participants of these plans are not current employees of the Company.

24

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

         The following table reconciles changes in the Company's unfunded accumulated postretirement benefit obligations during the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008			2007
	(in thousands)
Beginning accumulated postretirement benefit obligations	$	10,494		$	19,837
Net benefit payments		(298	)		(225	)
Service costs		48			259
Accretion of interest		157			287
Ending accumulated postretirement benefit obligations	$	10,401		$	20,158

NOTE J. Commitments and Contingencies

Legal actions. The Company is party to the legal actions that are described below. The Company is also party to other proceedings and claims incidental to its business. While many of these other matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to such other proceedings and claims will not have a material adverse effect on the Company's consolidated financial position as a whole or on its liquidity, capital resources or future annual results of operations. The Company will continue to evaluate its litigation on a quarter-by-quarter basis and will establish and adjust any litigation reserves as appropriate to reflect its assessment of the then current status of litigation.

MOSH Holding. On April 11, 2005, the Company and its principal United States subsidiary, Pioneer Natural Resources USA, Inc., were named as defendants in MOSH Holding, L.P. v Pioneer Natural Resources Company; Pioneer Natural Resources USA, Inc.; Woodside Energy (USA) Inc.; and JPMorgan Chase Bank, N.A., ("JP Morgan") as Trustee of the Mesa Offshore Trust, which is before the Judicial District Court of Harris County, Texas (334th Judicial District). Subsequently, Dagger-Spine Hedgehog Corporation ("Dagger-Spine") and a group of approximately fifty other unitholders ("Wiegand") each filed a Petition in Intervention in the lawsuit to assert the same claims as MOSH Holding, L.P. ("MHLP"). MHLP, Dagger-Spine and Wiegand (collectively, "Plaintiffs") are unitholders in the Trust, which was created in 1982 as the sole limited partner in a partnership that holds an overriding royalty interest in certain oil and gas leases offshore Louisiana and Texas. The Company owns the managing general partner interest in the partnership. Plaintiffs allege that the Company, together with Woodside Energy (USA) Inc. ("Woodside"), concealed the value of the royalty interest and worked to terminate the Mesa Offshore Trust ("MOT") prematurely and to capture for itself and Woodside profits that belong to MOT. Plaintiffs also allege breaches of fiduciary duty, misapplication of trust property, common law fraud, gross negligence, and breach of the conveyance agreement for the overriding royalty interest. The relief sought by the Plaintiffs includes monetary and punitive damages and certain equitable relief, including an accounting of expenses, a setting aside of certain farmouts, and a temporary and permanent injunction.

In July 2007, the Company filed a motion for summary judgment challenging Plaintiffs' standing to prosecute the case and seeking dismissal. The Company also filed a motion for summary judgment challenging the substantive merits of Plaintiffs' claims and seeking dismissal. These motions are pending before the court. Trial on the merits of the lawsuit is scheduled for December 2008. The Company believes the claims made by the Plaintiffs in the MOSH Holding lawsuit are without merit and intends to defend the lawsuit vigorously. The Company cannot predict whether the outcome of this proceeding will be adverse to the Company and if so, whether such an outcome will materially impact the Company's liquidity, financial position or future results of operations.

Equatorial Guinea Block H Arbitration. On June 14, 2007, a subsidiary of the Company ("Pioneer EG") commenced arbitration in London, England against Roc Oil (Equatorial Guinea) Company ("ROC EG"), Atlas Petroleum International Limited ("Atlas") and Osborne Resources Limited ("Osborne") to determine the parties' respective rights and obligations under a joint operating agreement relating to well operations in Block H in

25

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

deepwater Equatorial Guinea. ROC, Atlas and Osborne have, in turn, brought counterclaims against Pioneer EG in respect to alleged breaches of the farm-in agreements relating to Block H. In late 2006, the Republic of Equatorial Guinea ratified a new hydrocarbons law, which among other things, appears to entitle Equatorial Guinea to increase substantially its carried interest in all concessions, including Block H, either directly or through the National Oil Company. In addition, drilling costs for the well have increased significantly beyond those originally anticipated.

Given these and other factors, Pioneer EG maintains that it does not have an obligation to approve the drilling of a well on the block. The view of the other parties is that Pioneer EG does not have the right to prevent the drilling of the well or to refuse to pay its share of the costs thereof. ROC EG, Atlas and Osborne have also notified Pioneer EG that they reserve the right to claim damages should they suffer any loss, including any loss suffered if the underlying production sharing contract is terminated by Equatorial Guinea.

The parties have consolidated their respective claims under the joint operating agreement and the farm-in agreements into a single arbitration scheduled to be conducted in London, England in September 2008. Pioneer EG intends to vigorously assert its position in the arbitration. The Company cannot predict whether the outcome of this proceeding will be adverse to the Company and if so, whether such an outcome will materially impact the Company's liquidity, financial position or future results of operations.

Environmental Protection Agency Investigation.The Company previously reported that on November 4, 2005, the Company learned from the U.S. Environmental Protection Agency that the agency was conducting a criminal investigation into a 2003 spill that occurred at a Company-operated drilling rig located on an ice island offshore Harrison Bay, Alaska. The investigation is being conducted in conjunction with the U.S. Attorney's Office for the District of Alaska. The spill was previously investigated by the Alaska Department of Environmental Conservation ("ADEC") and, following completion of a clean up, the ADEC issued a letter stating its determination that, at that time, the site did not pose a threat to human health, safety or welfare, or the environment. The Company fully cooperated with the government's investigation. The Company does not believe that the outcome of this investigation will be adverse to the Company due to the passage of time and the Company's belief that it is not a target of the investigation.

Obligations following divestitures. In April 2006, the Company provided the purchaser of its Argentine assets certain indemnifications. The Company remains responsible for certain contingent liabilities related to such indemnifications, subject to defined limitations. The Company does not believe that these obligations, which primarily pertain to matters of litigation, environmental contingencies, royalty obligations and income taxes, are probable of having a material impact on its liquidity, financial position or future results of operations.

The Company has also retained certain liabilities and indemnified buyers for certain matters in connection with other divestitures, including the sale in 2007 of its Canadian assets. The Company does not believe that such matters are probable of having a material impact on its liquidity, financial position or future results of operations.

NOTE K. Income Per Share From Continuing Operations

Basic income per share from continuing operations is computed by dividing income from continuing operations by the weighted average number of common shares outstanding for the period. The computation of diluted income per share from continuing operations reflects the potential dilution that could occur if securities or other contracts to issue common stock that are dilutive to income from continuing operations were exercised or converted into common stock or resulted in the issuance of common stock that would then share in the earnings of the Company.

26

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

The following table is a reconciliation of basic weighted average common shares outstanding to diluted weighted average common shares outstanding for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008	2007
	(in thousands)
Weighted average common shares outstanding (a):
Basic	117,934	121,523
Dilutive common stock options	327	467
Restricted stock awards	831	804
Diluted (b)	119,092	122,794

_____________

(a) In 2007, the Company's board of directors ("Board") approved a $750 million share repurchase program of which $524.5 million remained as of March 31, 2008. During the first quarter of 2008, the Company purchased $12.8 million of common stock pursuant to the program.

(b) During the three month periods ended March 31, 2008 and 2007, the Company awarded 162,951 and 145,820 performance unit awards, respectively. Associated therewith, awards for 305,277 units and 145,820 units remained outstanding (net of forfeitures and lapses) as of March 31, 2008 and 2007, respectively. These units were excluded from the computations of diluted earnings per share for the presented periods because the criteria for the issuance of shares had not been met as of March 31, 2008 and 2007.

NOTE L. Geographic Operating Segment Information

The Company has operations in only one industry segment, that being the oil and gas exploration and production industry; however, the Company is organizationally structured along geographic operating segments or regions. The Company has reportable operations in the United States, South Africa and Tunisia.

As previously referred to in Note B, during 2007, the Company sold its Canadian assets having a carrying value of $424.4 million. The results of operations for those properties have been reclassified to discontinued operations in accordance with SFAS 144 and are excluded from the geographic operating segment information provided below. See Note Q for information regarding the Company's discontinued operations.

27

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

The following tables provide the Company's geographic operating segment data for the three-month periods ended March 31, 2008 and 2007. Geographic operating segment income tax (provisions) benefits have been determined based on statutory rates existing in the various tax jurisdictions where the Company has oil and gas producing activities. The "Headquarters" table column includes income and expenses that are not routinely included in the earnings measures internally reported to management on a geographic operating segment basis and operations in Equatorial Guinea and Nigeria, where the Company concluded exploration activities during 2007.

	United States			South Africa			Tunisia			Headquarters			Consolidated Total
	(in thousands)
Three months ended March 31, 2008:
Revenues and other income:
Oil and gas	$	492,037		$	29,580		$	36,859		$	—		$	558,476
Interest and other		—			—			—			25,024			25,024
Gain (loss) on disposition of assets, net		(3	)		—			—			681			678
		492,034			29,580			36,859			25,705			584,178
Costs and expenses:
Oil and gas production		119,430			9,980			3,237			—			132,647
Depletion, depreciation and amortization		96,204			4,392			1,721			7,310			109,627
Exploration and abandonments		25,824			48			10,114			2,691			38,677
General and administrative		—			—			—			36,481			36,481
Accretion of discount on asset retirement obligations		—			—			—			2,142			2,142
Interest		—			—			—			37,453			37,453
Hurricane activity, net		458			—			—			—			458
Other		—			—			—			11,626			11,626
		241,916			14,420			15,072			97,703			369,111
Income (loss) from continuing operations before income taxes		250,118			15,160			21,787			(71,998	)		215,067
Income tax benefit (provision)		(92,544	)		(4,396	)		(14,100	)		23,773			(87,267	)
Income (loss) from continuing operations	$	157,574		$	10,764		$	7,687		$	(48,225	)	$	127,800

28

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

	United States			South Africa			Tunisia			Headquarters			Consolidated Total
	(in thousands)
Three months ended March 31, 2007:
Revenues and other income:
Oil and gas	$	318,470		$	13,188		$	21,924		$	—		$	353,582
Interest and other		—			—			—			13,486			13,486
Gain (loss) on disposition of assets, net		1,083			—			—			(832	)		251
		319,553			13,188			21,924			12,654			367,319
Costs and expenses:
Oil and gas production		83,513			4,046			1,889			—			89,448
Depletion, depreciation and amortization		69,384			1,071			1,555			6,840			78,850
Exploration and abandonments		63,652			44			2,829			5,246			71,771
General and administrative		—			—			—			32,624			32,624
Accretion of discount on asset retirement obligations		—			—			—			1,632			1,632
Interest		—			—			—			28,425			28,425
Hurricane activity, net		13,548			—			—			—			13,548
Other		—			—			—			8,373			8,373
		230,097			5,161			6,273			83,140			324,671
Income (loss) from continuing operations before income taxes		89,456			8,027			15,651			(70,486	)		42,648
Income tax benefit (provision)		(33,099	)		(2,328	)		(9,647	)		30,442			(14,632	)
Income (loss) from continuing operations	$	56,357		$	5,699		$	6,004		$	(40,044	)	$	28,016

	March 31, 2008		December 31, 2007
Segment Assets:	(in thousands)
United States	$	7,944,495	$	7,932,366
South Africa		293,545		294,491
Tunisia		268,113		216,221
Headquarters		239,814		173,903
Total consolidated assets	$	8,745,967	$	8,616,981

NOTE M. Impairment of Long-Lived Assets

During the first quarter of 2008, events and circumstances indicated that (a) approximately $29.4 million of net assets in the Company's Mississippi area and (b) approximately $133.5 million of net assets in the Company's Piceance/Uinta area may have been partially impaired. The events and circumstances indicating a potential impairment in these areas are primarily related to downward adjustments to proved reserves associated with recent well performance. However, the Company's estimate of undiscounted future cash flows indicate that such carrying amounts are expected to be recovered. The Company's primary assumptions utilized to compute the estimated future cash flows included (a) proved reserves and appropriate risk-adjusted probable and possible reserves and (b) management's commodity price outlook. Nonetheless, it is reasonably possible that the estimate of undiscounted future cash flows may change in the future resulting in the need to impair the assets' carrying values. The primary factors that may affect future cash flows are (a) additional reserve adjustments, both positive and negative, (b) results of future drilling activities, (c) management's outlook on commodity prices and (d) increases or decreases in production and capital costs associated with these assets.

29

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NOTE N. Volumetric Production Payments

During 2005, the Company sold 27.8 MMBOE of proved reserves by means of three VPP agreements for net proceeds of $892.6 million, including the assignment of the Company's obligations under certain derivative hedge agreements. Proceeds from the VPPs were initially used to reduce outstanding indebtedness. The first VPP sold 58 Bcf of gas volumes over an expected five-year term that began in February 2005. The second VPP sold 10.8 MMBbls of oil volumes over an expected seven-year term that began in January 2006. The third VPP sold 6.0 Bcf of gas volumes over an expected 32-month term that began in May 2005 and 6.2 MMBbls of oil volumes over an expected five-year term that began in January 2006.

The Company's VPPs represent limited-term overriding royalty interests in oil and gas reserves that: (i) entitle the purchaser to receive production volumes over a period of time from specific lease interests; (ii) do not bear future production costs and capital expenditures associated with the reserves; (iii) are nonrecourse to the Company (i.e., the purchaser's only recourse is to the reserves acquired); (iv) transfer title of the reserves to the purchaser; and (v) allow the Company to retain the remaining reserves after the VPPs volumetric quantities have been delivered.

Under SFAS No. 19, "Financial Accounting and Reporting by Oil and Gas Producing Companies," a VPP is considered a sale of proved reserves. As a result, the Company (i) removed the proved reserves associated with the VPPs; (ii) recognized VPP proceeds as deferred revenue which are being amortized on a unit-of-production basis to oil and gas revenues over the term of each VPP; (iii) retained responsibility for 100 percent of the production costs and capital costs related to VPP interests; and (iv) no longer recognizes production associated with the VPP volumes.

The following table provides information about the deferred revenue carrying values of the Company's VPPs:

	Gas			Oil			Total
	(in thousands)
Deferred revenue at December 31, 2007	$	103,513		$	379,767		$	483,280
Less: 2008 amortization		(13,446	)		(26,033	)		(39,479	)
Deferred revenue at March 31, 2008	$	90,067		$	353,734		$	443,801

The above deferred revenue amounts will be recognized in oil and gas revenues in the Consolidated Statements of Operations as noted below, assuming the related VPP production volumes are delivered as scheduled (in thousands):

Remaining 2008	$	118,659
2009		147,906
2010		90,215
2011		44,951
2012		42,070
	$	443,801

30

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NOTE O.      Interest and Other Income

The following table provides the components of the Company's interest and other income:

	Three Months Ended March 31,
	2008		2007
	(in thousands)
Alaskan Petroleum Production Tax credits (a)	$	11,163	$	—
Change in asset retirement estimate		4,391		—
California emission credits		535		—
Royalty obligation accrual adjustment		—		4,816
Legal settlements		2,497		168
Other tax refunds		2		3,704
Minority interest in subsidiary net loss (see Note B)		—		2,084
Interest income		484		676
Other income		1,051		568
Deferred compensation plan income		1,371		777
Foreign currency remeasurement and exchange gains (b)		3,514		693
Bad debt recoveries		16		—
Total interest and other income	$	25,024	$	13,486

_____________

(a) The Company earns Alaskan Petroleum Production Tax ("PPT") credits on qualifying capital expenditures. The Company recognizes income from PPT credits at the time they are realized through a cash refund or sale.

(b) The Company's operations in Africa periodically recognize monetary assets and liabilities in currencies other than their functional currencies. Associated therewith, the Company realizes foreign currency remeasurement and transaction gains and losses.

NOTE P. Insurance Claims

During August and September 2005, the Company sustained damages as a result of Hurricanes Katrina and Rita at various facilities in the Gulf of Mexico. Other than the East Cameron facility discussed further below, the damages to the facilities were covered by physical damage insurance.

As a result of Hurricane Rita, the Company's East Cameron facility, located in the Gulf of Mexico shelf, was destroyed. The Company currently estimates that it will cost approximately $176 million to reclaim and abandon the East Cameron facility. The operations to reclaim and abandon the East Cameron facilities began in January 2007. The estimate to reclaim and abandon the East Cameron facility is based upon an analysis prepared by a third party engineering firm for a majority of the work, an estimate by the Company for the remaining work that was not covered by the third-party analysis and actual abandonment activity to date.

The $176 million estimate to reclaim and abandon the East Cameron facilities contains a number of assumptions that could cause the ultimate cost to be higher or lower as there are many uncertainties when working offshore and underwater with damaged equipment and wellbores. The Company currently believes costs could range from $176 million to $190 million; however, at this point no better estimate than any other amount within the range can be determined, thus the Company has recorded the estimated provision of $176 million, of which approximately $101.5 million has been expended through March 31, 2008.

31

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

         The Company filed a claim with its insurance providers regarding the loss at East Cameron. Under the Company's insurance policies, the East Cameron facility had the following coverages: (a) $14 million of scheduled property value for the platform, which was received in 2005, (b) $4 million of scheduled business interruption insurance after a deductible waiting period, which was received in 2006, (c) $100 million of well restoration and safety, in total, for all assets per occurrence and (d) $400 million for debris removal coverage for all assets per occurrence.

In the first quarter of 2007, the Company received $5 million from one of its insurance providers related to debris removal. At the present, no recoveries have been reflected related to certain costs associated with plugging and abandonment and the well restoration and safety coverages. In the third quarter of 2007, the Company commenced legal actions against its insurance carriers regarding policy coverage issues, primarily related to debris removal, certain costs associated with plugging and abandonment, and the well restoration and safety coverages. The Company continues to expect that a substantial portion of the loss will be recoverable from insurance.

NOTE Q. Discontinued Operations

In November 2007, the Company completed the sale of its Canadian subsidiaries for net proceeds of $525.7 million, resulting in a gain of $101.3 million. Pursuant to SFAS 144, the Company has reflected the results of operations of this transaction as discontinued operations, rather than as a component of continuing operations. The following table represents the components of the Company's discontinued operations for the three month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008			2007
	(in thousands)
Revenues and other income:
Oil and gas	$	—		$	38,340
Interest and other		1,903			623
Gain (loss) on disposition of assets, net (a)		66			(140	)
		1,969			38,823
Costs and expenses:
Oil and gas production		—			15,066
Depletion, depreciation and amortization (a)		—			13,288
Exploration and abandonments (a)		—			4,602
General and administrative		257			2,259
Accretion of discount on asset retirement obligations (a)		—			426
Interest		—			69
Other		45			(1,993	)
		302			33,717
Income from discontinued operations before income taxes		1,667			5,106
Income tax benefit (provision):
Current		(519	)		(4,494	)
Deferred (a)		792			965
Income from discontinued operations	$	1,940		$	1,577

____________

(a) Represents the significant noncash components of discontinued operations. Included in exploration and abandonments is approximately $3.5 million for the three months ending March 31, 2007.

32

PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

March 31, 2008

(Unaudited)

NOTE R. Subsequent Events

Pioneer Southwest Energy Partners L.P. Initial Public Offering. On May 6, 2008, Pioneer Southwest Energy Partners L.P. ("Pioneer Southwest"), a subsidiary of the Company, completed its initial public offering of 9,487,500 common units, including the over-allotment option, representing a 31.6 percent limited partner interest in Pioneer Southwest. Pioneer Southwest owns interests in certain oil and gas properties previously owned by the Company in the Spraberry field in the Permian Basin of West Texas. The Company owns a 0.1 percent general partner interest and a 68.3 percent limited partner interest in Pioneer Southwest. The Company received $163.0 million of net proceeds from Pioneer Southwest in consideration for (i) an ownership interest in a subsidiary of the Company that owned the oil and gas properties prior to the initial public offering and (ii) an additional ownership interest in certain of the same properties as a result of the exercise of the over-allotment option. The net proceeds from the initial public offering were used to reduce the Company's outstanding indebtedness. The Company will consolidate Pioneer Southwest into its financial statements and reflect the public ownership as a minority interest.

In conjunction with the completion of the initial public offering, Pioneer Southwest closed a $300 million unsecured revolving credit facility with a syndicate of banks.

Transportation Agreements. During April 2008, the Company entered into a firm transportation contract for one pipeline and submitted a bid for firm transportation on another pipeline for the future transportation of gas production from the Company's Raton Basin properties located in southeastern Colorado. Future minimum transportation fees under these transportation arrangements could total approximately $482 million in the aggregate, payable over 10-year terms of service. The Company's obligations under each of these arrangements are contingent upon the pipeline carrier successfully sanctioning and constructing the applicable pipeline project; however, the Company’s obligations under one contract are not conditioned on the performance of the pipeline carrier’s obligations under the other contract. Subject to sanctioning and construction, first services through one of the pipelines may commence during mid-2010 and the remaining transportation services are expected to commence in 2011.

33

PIONEER NATURAL RESOURCES COMPANY

Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations

Financial and Operating Performance

The Company's financial and operating performance for the first quarter of 2008 included the following highlights:

• Recognition of net income of $129.7 million ($1.09 per diluted share), as compared to $29.6 million ($0.24 per diluted share) for the first quarter of 2007.

• Realization of net cash provided by operating activities of $177.7 million, as compared to $130.0 million in the comparable quarter of 2007. The increase in 2008, as compared to 2007, is primarily due to increased sales volumes along with increased oil, NGL and gas prices.

• Issuance of $500 million principal amount of 2.875% convertible senior notes due 2038.

• Repurchase of 293 thousand shares of common stock at an aggregate cost of $12.8 million under the Company's share repurchase program at an average price per share of $43.51.

Recent Events

Pioneer Southwest Energy Partners L.P. Initial Public Offering. On May 6, 2008, Pioneer Southwest completed its initial public offering of 9,487,500 common units, including the over-allotment option, representing a 31.6 percent limited partner interest in Pioneer Southwest. Pioneer Southwest owns interests in certain oil and gas properties previously owned by the Company in the Spraberry field in the Permian Basin of West Texas. The Company owns a 0.1 percent general partner interest and a 68.3 percent limited partner interest in Pioneer Southwest. The Company received $163.0 million of net proceeds from Pioneer Southwest in consideration for (i) an ownership interest in a subsidiary of the Company that owned the oil and gas properties prior to the initial public offering and (ii) an additional ownership interest in certain of the same properties as a result of the exercise of the over-allotment option. The net proceeds from the initial public offering were used to reduce the Company's outstanding indebtedness. The Company will consolidate Pioneer Southwest into its financial statements and reflect the public ownership as a minority interest.

Second Quarter 2008 Outlook

Based on current estimates, the Company expects that second quarter 2008 production will average 110,000 to 115,000 BOEPD. Production growth during the second quarter of 2008 will be driven primarily by increasing production in the Spraberry field, Raton field, Edwards Trend and Tunisia. The lower end of the range primarily reflects the typical variability in the timing of oil cargo shipments in South Africa and Tunisia. The range includes approximately 1,100 BOEPD of production that is attributable to the public ownership in Pioneer Southwest. The expense estimates below also include portions attributable to the public ownership in Pioneer Southwest.

Second quarter production costs (including production and ad valorem taxes and transportation costs) are expected to average $12.75 to $13.75 per BOE based on current NYMEX strip prices for oil and gas. Depletion, depreciation and amortization ("DD&A") expense is expected to average $10.75 to $11.75 per BOE.

Total exploration and abandonment expense is expected to be $40 million to $70 million and could include up to $35 million from activities in the Company's resource plays and associated acreage costs, primarily in the Edwards Trend in South Texas and Tunisia, and $35 million in seismic investments, personnel costs and other costs.

General and administrative expense is expected to be $34 million to $38 million. Interest expense is expected to be $36 million to $40 million. Accretion of discount on asset retirement obligations is expected to be $2 million to $4 million.

The Company's second quarter 2008 effective income tax rate is expected to range from 40 percent to 50 percent based on current capital spending plans and cash taxes are estimated to be $15 million to $25 million, primarily related to Tunisia.

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PIONEER NATURAL RESOURCES COMPANY

Acquisitions, Divestments, Operations and Drilling Highlights

The Company intends to limit 2008 capital expenditures, excluding acquisitions, effects of asset retirement obligations, capitalized interest and geological and geophysical administrative costs, to less than internally-generated operating cash flow. During the first quarter of 2008, the Company spent approximately $306 million of capital, excluding acquisitions, effects of asset retirement obligations, capitalized interest and geological and geophysical administrative costs.  Such capital expenditures included certain seismic expenditures that are front-end loaded in the annual expenditures plan and certain capital expenditures that were originally planned to be incurred in 2007, but were not completed until 2008. The Company is evaluating its remaining 2008 capital budget based on actual first quarter 2008 expenditures, including drilling successes during the quarter, and anticipated capital cost increases due to increases in steel and fuel costs as a result of higher commodity prices. However, for 2008, the Company expects that cash flow from operations will be sufficient to fund the Company's capital expenditures, excluding acquisitions, effects of asset retirement obligations, capitalized interest and geological and geophysical administrative costs.

Approximately 90 percent of the 2008 capital expenditures will be focused on low-risk development drilling and resource play extensions in Pioneer's four core onshore areas (Spraberry, Raton, Edwards Trend and Tunisia). The remaining ten percent will be focused primarily on development drilling in the Oooguruk project and Barnett Shale drilling.

The following table summarizes by geographic area the Company's finding and development costs incurred during the first quarter of 2008:

									Asset
	Acquisition Costs				Exploration		Development		Retirement
	Proved		Unproved		Costs		Costs		Obligations		Total
	(in thousands)
United States:
Permian Basin	$	275	$	1,022	$	1,670	$	116,768	$	74	$	119,809
Mid-Continent		—		—		48		1,590		—		1,638
Rocky Mountains		(1,147)		375		13,949		37,630		315		51,122
Barnett Shale		2,549		113		3,325		2,160		4		8,151
Onshore Gulf Coast		1,168		545		49,643		21,837		105		73,298
Alaska		—		—		6,197		25,278		—		31,475
Other		—		—		(95)		(294)		—		(389)
		2,845		2,055		74,737		204,969		498		285,104
South Africa		—		—		48		2,299		3,659		6,006
Tunisia		—		—		33,482		6,122		324		39,928
Other		—		—		2,689		—		—		2,689
		—		—		36,219		8,421		3,983		48,623
Total Worldwide	$	2,845	$	2,055	$	110,956	$	213,390	$	4,481	$	333,727

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PIONEER NATURAL RESOURCES COMPANY

The following table summarizes the Company's development and exploration/extension drilling activities for the three months ended March 31, 2008:

	Development Drilling
	Beginning Wells	Wells	Successful	Unsuccessful	Ending Wells
	in Progress	Spud	Wells	Wells	in Progress
United States	10	144	136	—	18

	Exploration/Extension Drilling
	Beginning Wells	Wells	Successful	Unsuccessful	Ending Wells
	in Progress	Spud	Wells	Wells	in Progress
United States	23	12	13	1	21
Tunisia	1	3	2	—	2
Total Worldwide	24	15	15	1	23

Permian Basin area. The Company drilled 94 wells in the first quarter 2008, principally in the Spraberry field. First quarter 2008 drilling activity in the Spraberry field also included four successful 20-acre infill wells. In total, the Company plans to drill 20 to 25 20-acre wells during 2008 to test downspacing performance as part of its announced recovery improvements initiatives, which also include secondary recovery waterflood projects and fracing five previously unstimulated horizontal wells. The Company plans to drill approximately 350 wells, including 20-acre wells, in the Spraberry field during 2008. The majority of these Spraberry wells are being drilled deeper to add the Wolfcamp formations, which provide incremental production and proved reserves at attractive economics. The Company is also continuing to pursue acreage expansion opportunities and bolt-on acquisitions in the area.

Mid-Continent area. The Company continues to pursue field enhancement alternatives to optimize production in the area. In the Hugoton field, the Company has received regulatory approval to commingle production from the Panoma and Council Grove formations. A commingling pilot program has been initiated and the Company is monitoring its production performance. Pioneer has also received regulatory relief to increase the well density in certain portions of the West Panhandle field, which added future drilling locations.

Rocky Mountains area. During the first quarter 2008, the Company announced the discovery of the Pierre Shale within the Raton Basin. The Pierre Shale lies beneath existing acreage in the Raton coal bed methane field. To date, the Company has drilled 10 vertical wells in the Pierre Shale play, five in the heart of the play to prove the commerciality of the zone, and five to test the boundaries of the zone. During the first quarter of 2008, the Company drilled 46 wells in the Raton field, four of which were drilled in the Pierre Shale. During 2008, the Company plans to drill a total of 160 wells in the Raton field, of which 15 are planned for the Pierre Shale. The Company is also enhancing its gathering and compression facilities in the area during 2008. Current plans include a further ramp up of drilling in the Raton field and Pierre Shale during 2009.

In northwest Colorado, the Company's programs to evaluate the CBM resource potential at Lay Creek and Columbine Springs are progressing. If the pilot projects are successful in producing commercial quantities of gas, full field development could begin in 2009.

Onshore Gulf Coast area. The Company drilled 11 wells in the Edwards Trend during the first quarter of 2008 and expects to drill over 35 wells in the Edwards Trend during 2008. The Company continues to add infrastructure, primarily gas treating capacity and pipeline systems, related to its discoveries and development activity in the trend. The Company estimates that it will add 25 to 50 MMcfpd of additional treating capacity over the remainder of 2008.

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PIONEER NATURAL RESOURCES COMPANY

In the Edwards Trend, the Company also continues its shooting and interpretation of approximately 900 square miles of 3-D seismic data over its new field discoveries. The seismic data will allow the Company to more accurately locate and orient the horizontal wells for optimal results.

Barnett Shale. During the first quarter of 2008, the Company participated in the drilling of two successful exploration wells on the approximate 80,000 gross acres in the Barnett Shale play that it acquired in 2007. The Company plans to drill 20 wells during 2008 with the expectation of increasing its drilling program in 2009.

Alaska area. On the Oooguruk project, the Company drilled one disposal well and one producing well during the first quarter of 2008 with the expectation of drilling four to five additional producing wells and several injection wells by the end of the year. The Company estimates first production will occur during the second quarter of 2008 and first sales will occur after scheduled mid-year 2008 maintenance of onshore production facilities.

On the Cosmopolitan project, the Company drilled a lateral sidetrack from an existing wellbore from an onshore site to further appraise the resource potential of the unit. The initial unstimulated production test results were encouraging. The Company will conduct permitting activities and facilities planning over the remainder of 2008 and plans to drill another appraisal well in 2009.

South Africa. First production from the Company's South Coast Gas project commenced late in the third quarter of 2007 from four wells and sales commenced in the fourth quarter of 2007. A significant portion of the gas reserves associated with the South Coast Gas project is in the Sable field. Initially, the gas production from the Sable field was not expected to commence until the oil production was completed. However, as a result of production performance from the Sable field and improved oil prices, which have had the effect of extending the economic life of the Sable oil field, facilities modifications are being planned that would allow for the simultaneous production of oil and gas from the Sable field. The modifications are currently expected to be completed in late 2008 or early 2009. Once these modifications are completed, the floating, production, storage and offloading vessel will be released, which is expected to result in a substantial reduction in future lease operating expenses.

Tunisia. In the Adam Concession, the Company drilled two successful appraisal wells in the first quarter 2008. Both wells are currently on production and the Company plans to drill three additional wells during the remainder of 2008.

In the Cherouq Concession, the Company drilled one exploration well that was determined to be a discovery during the second quarter of 2008 and plans to drill six additional exploration wells during the remainder of 2008. The Company also acquired an additional 295 square kilometers of 3-D seismic data over the Cherouq Concession during the first quarter of 2008 and is currently evaluating the results.

In the Anaguid permit, the Company intends to acquire an additional 900 square kilometers of 3-D seismic data and expects to drill up to two exploration wells in the second half of 2008. In the Borj El Khadra Permit, the Company plans to drill two wells in 2008.

Results of Operations

Oil and gas revenues. Oil and gas revenues from continuing operations totaled $558.5 million and $353.6 million for the three-month periods ended March 31, 2008 and 2007, respectively.

The increase in oil and gas revenues from continuing operations during the three months ended March 31, 2008, as compared to the same period of 2007, is reflective of increases in revenues for all operating segments. The increase in revenues in the United States was primarily due to volume increases resulting from successful drilling activity and reductions in scheduled volumetric production payment ("VPP") deliveries, combined with an increase in reported oil, natural gas liquids ("NGL") and gas prices. Revenues in Tunisia increased primarily due to gas sales in 2008 under a gas sales arrangement that was initiated during the second quarter of 2007 and increases in average oil prices. South African revenues increased due to increases in reported oil prices and 2008 gas sales from the South Coast Gas project, which recorded first gas sales during the fourth quarter of 2007.

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PIONEER NATURAL RESOURCES COMPANY

The following table provides average daily sales volumes from continuing operations, by geographic area and in total, for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended
	March 31,
	2008	2007
Oil (Bbls):
United States	21,419	18,808
South Africa	2,823	2,347
Tunisia	3,903	4,093
Worldwide	28,145	25,248
NGLs (Bbls):
United States	19,408	16,855
Gas (Mcf):
United States	369,819	282,594
South Africa	5,073	—
Tunisia	1,578	—
Worldwide	376,470	282,594
Total (BOE):
United States	102,463	82,762
South Africa	3,669	2,347
Tunisia	4,166	4,093
Worldwide	110,298	89,202

On a quarter-to-quarter BOE comparison, average daily sales volumes increased by 24 percent in the United States, by 56 percent in South Africa and by two percent in Tunisia.

During the three months ended March 31, 2008, as compared to the three months ended March 31, 2007, oil volumes delivered under the Company's VPPs decreased by 157 MBOE (five percent) and gas volumes delivered under the Company's VPPs decreased by 121 MBOE (21 percent), respectively.

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PIONEER NATURAL RESOURCES COMPANY

The oil, NGL and gas prices that the Company reports are based on the market price received for the commodities adjusted by the results of the Company's cash flow hedging activities and the amortization of deferred VPP revenue. The following table provides average reported prices from continuing operations (including the results of hedging activities and the amortization of deferred VPP revenue) and average realized prices from continuing operations (excluding the results of hedging activities and the amortization of deferred VPP revenue) by geographic area and in total, for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008		2007
Average reported prices:
Oil (per Bbl):
United States	$	70.23	$	51.99
South Africa	$	101.48	$	62.43
Tunisia	$	99.36	$	59.51
Worldwide	$	77.41	$	54.18
NGL (per Bbl):
United States	$	53.89	$	31.68
Gas (per Mcf):
United States	$	7.73	$	7.17
South Africa	$	7.61	$	—
Tunisia	$	10.90	$	—
Worldwide	$	7.74	$	7.17
Average realized prices:
Oil (per Bbl):
United States	$	97.64	$	55.41
South Africa	$	101.48	$	62.43
Tunisia	$	99.36	$	59.51
Worldwide	$	98.26	$	56.73
NGL (per Bbl):
United States	$	54.28	$	31.68
Gas (per Mcf):
United States	$	7.34	$	6.24
South Africa	$	7.61	$	—
Tunisia	$	10.90	$	—
Worldwide	$	7.36	$	6.24

Hedging activities. The Company utilizes commodity swap and collar contracts to (i) reduce the impact on the Company's results of operations from the price volatility of the commodities the Company produces and sells, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. During the three-month periods ended March 31, 2008 and 2007, the Company's commodity price hedges decreased oil, NGL and gas revenues from continuing operations by $80.6 million and $27.0 million, respectively. The effective portions of changes in the fair values of the Company's commodity price hedges are deferred as increases or decreases to stockholders' equity until the underlying hedged transaction occurs. Consequently, changes in the effective portions of commodity price hedges add volatility to the Company's reported stockholders' equity until the hedge derivative matures or is terminated.

Deferred revenue. During the three-month periods ended March 31, 2008 and 2007, the Company's amortization of deferred VPP revenue increased oil and gas revenues from continuing operations by $39.5 million and $45.0 million, respectively. See Notes G and N of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for specific information regarding the Company's VPPs.

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PIONEER NATURAL RESOURCES COMPANY

Interest and other income. Interest and other income from continuing operations for the three-month periods ended March 31, 2008 and 2007 was $25.0 million and $13.5 million, respectively. The $11.5 million increase in interest and other income from continuing operations during the three months ended March 31, 2008, as compared to the same period in 2007, was primarily due to an $11.2 million Alaskan PPT credit dispositions realized during the first quarter of 2008. See Note O of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information.

Oil and gas production costs. The Company recorded oil and gas production costs from continuing operations of $132.6 million and $89.4 million during the three-month periods ended March 31, 2008 and 2007, respectively. In general, lease operating expenses and workover expenses represent the components of oil and gas production costs over which the Company has management control, while production and ad valorem taxes are directly related to commodity price changes and third-party transportation charges are related to volumes produced. Total oil and gas production costs per BOE from continuing operations increased by 19 percent during the three-month period ended March 31, 2008, as compared to the same period in 2007, primarily due to (i) a $1.49 per BOE increase in lease operating expense due to fixed production costs associated with declining South African Sable oil production, initial production operations in the Tunisian Cherouq concession, unscheduled compressor repairs and maintenance in the Raton field and general inflation of oilfield service costs and (ii) a $.67 per BOE increase in production taxes due to commodity price increases, partially offset by (iii) a slight decline in ad valorem taxes, primarily resulting from the effects of tax reform legislation in Texas.

The following tables provide the components of the Company's total oil and gas production costs per BOE from continuing operations and total oil and gas production costs per BOE from continuing operations by geographic area for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008		2007
Lease operating expenses	$	7.77	$	6.28
Third-party transportation charges		0.99		0.93
Taxes:
Ad valorem		1.30		1.42
Production		2.49		1.82
Workover costs		0.67		0.69
Total production costs	$	13.22	$	11.14

	Three Months Ended
	March 31,
	2008		2007
United States	$	12.81	$	11.21
South Africa	$	29.90	$	19.16
Tunisia	$	8.54	$	5.13
Worldwide	$	13.22	$	11.14

Depletion, depreciation and amortization expense. The Company's total DD&A expense from continuing operations was $10.92 per BOE and $9.82 per BOE for the three-month periods ended March 31, 2008 and 2007, respectively. The $30.8 million increase in total DD&A expense during the three months ended March 31, 2008, as compared to the same period in 2007, is comprised of a $30.3 million increase in depletion of oil and gas properties and a $0.5 million increase in depreciation and amortization of other property and equipment.

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PIONEER NATURAL RESOURCES COMPANY

Depletion expense from continuing operations, the largest component of DD&A expense from continuing operations, was $10.19 per BOE during the three months ended March 31, 2008, respectively, as compared to $8.97 per BOE during the same period in 2007. The 14 percent increase in per BOE depletion expense from continuing operations during the three-month period ended March 31, 2008, as compared to the same period in 2007, was primarily due to (i) a generally increasing trend in the Company's oil and gas properties' cost bases per BOE of proved and proved developed reserves as a result of cost inflation in drilling rig rates and drilling supplies and (ii) production from the South Coast gas project in South Africa that has a higher depletion rate.

The following table provides depletion expense per BOE from continuing operations by geographic area for the three-month periods ended March 31, 2008 and 2007:

	Three Months Ended March 31,
	2008		2007
United States	$	10.32	$	9.32
South Africa	$	13.16	$	5.07
Tunisia	$	4.54	$	4.22
Worldwide	$	10.19	$	8.97

Exploration and abandonments expense. The following tables provide the Company's geological and geophysical costs, exploratory dry hole expense, lease abandonments and other exploration expense from continuing operations by geographic area for the three-month periods ended March 31, 2008 and 2007:

	United		South
	States		Africa		Tunisia		Other		Total
	(in thousands)
Three months ended March 31, 2008:
Geological and geophysical	$	22,641	$	48	$	8,835	$	2,395	$	33,919
Exploratory dry holes		1,290		—		1,279		296		2,865
Leasehold abandonments and other		1,893		—		—		—		1,893
	$	25,824	$	48	$	10,114	$	2,691	$	38,677
Three months ended March 31, 2007:
Geological and geophysical	$	22,001	$	44	$	278	$	5,237	$	27,560
Exploratory dry holes		39,014		—		2,551		9		41,574
Leasehold abandonments and other		2,637		—		—		—		2,637
	$	63,652	$	44	$	2,829	$	5,246	$	71,771

The Company's exploration and abandonment expense from continuing operations during the first quarter of 2008 is primarily attributable to continued seismic activity in the Company's South Texas and Tunisian plays. During the three months ended March 31, 2008, the Company drilled and evaluated 16 exploration/extension wells, 15 of which were successfully completed as discoveries. During the same period in 2007, the Company drilled and evaluated 21 exploration/extension wells, 13 of which were successfully completed as discoveries. The decline in the number of exploration/extension wells drilled by the Company is primarily due to the Company's sale of its Canadian assets during November 2007.

General and administrative expense. General and administrative expense from continuing operations for the three-month periods ended March 31, 2008 and 2007 was $36.5 million and $32.6 million, respectively. The increase in general and administrative expense from continuing operations was primarily due to an increase in performance-related compensation costs, including the amortization of share-based compensation to officers, directors and employees. As of March 31, 2008, the Company has $70.8 million of deferred compensation expense related to unvested restricted stock awards that will be charged to earnings over a weighted average period of approximately 23 months. The Company continues to monitor its general and administrative expense and is focused

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PIONEER NATURAL RESOURCES COMPANY

on administrative cost control. However, the Company anticipates that the administration of Pioneer Southwest will necessitate an increase in the Company's general and administrative expenses.

Accretion of discount on asset retirement obligations.Accretion of discount on asset retirement obligations from continuing operations was $2.1 million and $1.6 million for the three month periods ended March 31, 2008 and 2007, respectively. The increase in accretion of discount on asset retirement obligations during 2008 is primarily due to new wells placed on production. See Note H of Notes to Consolidated Financial Statements in "Item 1. Financial Statements" for information regarding the Company's asset retirement obligations.

Interest expense. Interest expense from continuing operations was $37.5 million and $28.4 million for the three-month periods ended March 31, 2008 and 2007, respectively. The weighted average interest rate on the Company's indebtedness for the three months ended March 31, 2008, including the effects of interest rate derivatives and capitalized interest, was 5.6 percent as compared to 6.3 percent for the same period in 2007. The increase in interest expense from continuing operations during the three months ended March 31, 2008, as compared to the same period of 2007, was primarily due to (i) a $9.7 million increase in interest incurred on senior note and credit facility borrowings as a result of the Company's 2007 capital expenditures and treasury stock purchases exceeding operating cash flows and (ii) a $1.4 million decrease in capitalized interest on the Company's Oooguruk and South Coast Gas development projects in Alaska and South Africa, partially offset by (iii) a $1.3 million decrease in noncash interest expense attributable to certain discounted liabilities and deferred hedge losses.

Hurricane activity, net. The Company recorded net hurricane related activity expenses of $.5 million and $13.5 million during the three-month periods ended March 31, 2008 and 2007, respectively, which are associated with the Company's East Cameron platform facility, located on the Gulf of Mexico shelf, which was destroyed during 2005 by Hurricane Rita.

The Company estimates that it will cost approximately $176 million to reclaim and abandon the East Cameron facility. The operations to reclaim and abandon the East Cameron facilities began in January 2007. The estimate to reclaim and abandon the East Cameron facility is based upon an analysis prepared by a third party engineering firm for a majority of the work, an estimate by the Company for the remaining work that was not covered by the third-party analysis and actual abandonment activity to date. During the third quarter of 2007, the Company commenced legal actions against its insurance carriers regarding certain policy coverage issues. The Company continues to expect that a substantial portion of the loss will be recoverable by insurance. See Note P of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for specific information regarding the Company's East Cameron facility reclamation and abandonment.

Other expenses. Other expenses from continuing operations for the three-month periods ended March 31, 2008 and 2007 were $11.6 million and $8.4 million, respectively. The increase in other expenses is primarily attributable to a $6.1 million increase in the cost of idle drilling equipment, principally located in Alaska, partially offset by a $2.3 million decrease in legal contingency accrual adjustments and a $1.9 million decrease in hedge ineffectiveness charges.

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PIONEER NATURAL RESOURCES COMPANY

Income tax provision. The Company recognized income tax provisions on continuing operations of $87.3 million and $14.6 million during the three-month periods ended March 31, 2008 and 2007, respectively. The Company's effective tax rate on continuing operations of 41 percent during the three months ended March 31, 2008, differs from the combined United States federal and state statutory rate of approximately 37 percent primarily due to:

• foreign tax rates,

• statutes in foreign jurisdictions that differ from those in the United States,

• a $4.9 million U.S. tax provision related to the Company no longer having identifiable plans to reinvest South Africa earnings in South Africa, and

• a $4.8 million U.S. tax benefit related to remeasurement of the Company's state deferred tax liability.

See Note E of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding the Company's income taxes.

Discontinued operations. In November 2007, the Company sold its Canadian subsidiaries for $525.7 million, resulting in a gain of $101.3 million. The historic results of these subsidiaries and the related gain on disposition are reported as discontinued operations. The Company recognized income from discontinued operations of $1.9 million and $1.6 million during the three-month periods ended March 31, 2008 and 2007, respectively. See Note Q of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding discontinued operations.

Capital Commitments, Capital Resources and Liquidity

Capital commitments. The Company's primary needs for cash are for development, exploration and acquisition of oil and gas assets, payment of contractual obligations and working capital obligations. Funding for these cash needs, as well as funding for any stock repurchases that the Company may undertake, may be provided by any combination of internally-generated cash flow, proceeds from the disposition of nonstrategic assets or alternative financing sources as discussed in "Capital resources" below.

Oil and gas properties. The Company's cash expenditures for additions to oil and gas properties during the three-month periods ended March 31, 2008 and 2007, totaled $297.3 million and $438.6 million, respectively. During the three months ended March 31, 2008, the Company's expenditures for additions to oil and gas properties were funded by $177.7 million of net cash provided by operating activities and $130.8 million of the remaining proceeds received in January 2008 from the sale of the Company's Canadian assets in November 2007. During the three months ended March 31, 2007, the Company's expenditures for additions to oil and gas properties were funded by $130.0 million of net cash provided by operating activities and borrowings on the Company's credit facility.

Contractual obligations, including off-balance sheet obligations. The Company's contractual obligations include long-term debt, operating leases, drilling commitments, derivative obligations, other liabilities, transportation commitments and VPP obligations. From time-to-time, the Company enters into off-balance sheet arrangements and transactions that can give rise to material off-balance sheet obligations of the Company. As of March 31, 2008, the material off-balance sheet arrangements and transactions that the Company has entered into included (i) undrawn letters of credit, (ii) operating lease agreements, (iii) drilling commitments, (iv) VPP obligations (to physically deliver volumes and pay related lease operating expenses in the future) and (v) contractual obligations for which the ultimate settlement amounts are not fixed and determinable, such as derivative contracts that are sensitive to future changes in commodity prices. Other than the off-balance sheet arrangements described above, the Company has no transactions, arrangements or other relationships with unconsolidated entities or other persons that are reasonably likely to materially affect the Company's liquidity or availability of or requirements for capital resources. Since December 31, 2007, the material changes in the Company's contractual obligations included a $48.1 million increase in outstanding long-term borrowings, a $39.5 million decrease in the Company's VPP obligations, a $150.3 million increase in the Company's net derivative obligations, a $71.8 million decrease in the Company's drilling commitments and, subject to counterparty performance contingencies, a $482 million increase in the Company's transportation commitments. See Notes F and R of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding the Company's long-term debt and

43

PIONEER NATURAL RESOURCES COMPANY

transportation agreements, and "Item 3. Quantitative and Qualitative Disclosures About Market Risk" for a table of changes in the fair value of the Company's open derivative obligations during the three months ended March 31, 2008.

In accordance with GAAP, the Company periodically measures and records certain financial assets and liabilities at fair value. Effective January 1, 2008, the Company adopted the provisions of SFAS 157 for which delayed adoption is not provided under FSP FAS 157-1. SFAS 157 retains the exchange price notion in the definition of fair value but clarifies that the exchange price is the price in an orderly transaction between market participants to sell an asset or transfer a liability in the principal or most advantageous market in which the reporting company would transact for the asset or liability.

The SFAS 157 valuation framework is based upon inputs that market participants use in pricing an asset or liability, which are classified into two categories: observable inputs and unobservable inputs. Observable inputs represent market data obtained from independent sources; whereas unobservable inputs reflect a company's own market assumptions, which are used if observable inputs are not reasonably available without undue cost and effort. These two types of inputs are further prioritized into the following fair value input hierarchy:

• Level 1 – quoted prices for identical assets or liabilities in active markets.

• Level 2 – quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; inputs other than quoted prices that are observable for the asset or liability (e.g. interest rates); and inputs derived principally from or corroborated by observable market data by correlation or other means.

• Level 3 – unobservable inputs for the asset or liability.

The fair value input hierarchy level to which an asset or liability measurement in its entirety falls is determined based on the lowest level input that is significant to the measurement in its entirety. As of March 31, 2008, the significant inputs utilized by the Company to measure the fair value of its financial assets and liabilities represented Level 1 and Level 2 inputs in the input hierarchy.

The financial assets and liabilities that the Company periodically measures and records at fair value include trading securities, deferred compensation plan assets, commodity derivative obligations and interest rate derivative obligations. See Note D of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding these financial assets and liabilities and the valuation techniques used to measure their fair values. The Company validates its valuation techniques by comparing the fair values that result from the valuation techniques and inputs to value estimates provided by the derivative counterparties.

The Company's commodity and interest rate derivative obligations that are periodically measured and recorded at fair value represent those derivatives that continue to be subject to market or credit risk. As of March 31, 2008, they represented liabilities of $456.1 million. The ultimate liquidation value of the Company's commodity and interest rate derivatives will be dependent upon actual future commodity prices and interest rates, which may differ materially from the inputs used to determine the derivatives' fair values as of March 31, 2008. The Company enters into these derivatives for the primary purpose of hedging commodity price risk on forecasted physical commodity sales and interest rate risk on variable rate indebtedness and has an expectation of a high degree of correlation between changes in the derivative values and the hedged risks. See Note G of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" and "Item 3. Quantitative and Qualitative Disclosures About Market Risk" for additional information about the Company's derivative instruments and market risk.

Capital resources. The Company's primary capital resources are net cash provided by operating activities, proceeds from financing activities and proceeds from sales of nonstrategic assets. The Company expects that these resources will be sufficient to fund its capital commitments during the foreseeable future. For 2008, the Company expects that cash flow from operations will be sufficient to fund the Company's capital expenditures, excluding acquisitions, effects of asset retirement obligations, capitalized interest and geological and geophysical administrative costs.

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PIONEER NATURAL RESOURCES COMPANY

Asset divestitures. In November 2007, the Company sold all of the common stock of its Canadian subsidiaries for net proceeds of $525.7 million, $132.8 million of which was deposited in a Canadian escrow account pending receipt from the Canada Revenue Agency of appropriate tax certifications. The tax certifications were received in January 2008 and the escrowed funds were subsequently released to the Company.

Operating activities. Net cash provided by operating activities during the three-month periods ended March 31, 2008 and 2007 was $177.7 million and $130.0 million, respectively. The increase in net cash provided by operating activities during the first quarter of 2008, as compared to the first quarter of 2007, is primarily due to (i) increased sales volumes and increased oil, NGL and gas prices from continuing operations, partially offset by increased production costs and (ii) 11.2 million of income realized from the disposal of Alaskan PPT credits.

Investing activities. Investing activities used $177.5 million and $447.5 million of cash during the three-month periods ended March 31, 2008 and 2007, respectively. The decrease in net cash used in investing activities during the first quarter of 2008, as compared to the first quarter of 2007, is primarily due to a $141.4 million decrease in additions to oil and gas properties and a $127.4 million increase in proceeds from the disposition of assets.

Financing activities. Net cash provided by financing activities during the three-month periods ended March 31, 2008 and 2007 was $5.0 million and $323.6 million, respectively. The decrease in net cash provided by financing activities during the three months ended March 31, 2008, as compared to the same period of 2007, was primarily due to net borrowings of long-term debt during the 2007 period to fund portions of the Company's additions to oil and gas properties.

During February 2008, the Board declared a semiannual dividend of $0.14 per common share payable to shareholders of record on March 31, 2008. Associated therewith, the Company paid $16.8 million of aggregate dividends during April 2008. Future dividends are at the discretion of the Board, and, if declared, the Board may change the current dividend amount based on the Company's liquidity and capital resources at the time.

During 2007, the Board also approved a share repurchase program authorizing the purchase of up to $750 million of the Company's common stock. During the three-month periods ended March 31, 2008 and 2007, the Company expended $12.8 million to acquire 293 thousand shares of treasury stock and $31.4 million to acquire 811 thousand shares of treasury stock, respectively. As of March 31, 2008, approximately $524.5 million of stock may be purchased in the future under the $750 million Board authorization.

During January 2008, the Company issued $500 million principal amount of 2.875% convertible senior notes due 2038 (the "2.875% Senior Convertible Notes") and received proceeds, net of approximately $11.3 million of underwriter discounts and offering costs, of approximately $488.7 million. The Company used the net proceeds from the offering to reduce outstanding borrowings under its credit facility.

During January 2008, the Company entered into interest rate swap contracts and designated the contracts as cash flow hedges of the forecasted interest rate risk associated with a portion of the Company's credit facility indebtedness. The interest rate swap contracts are variable-for-fixed-rate swaps on $400 million notional amount of debt at a weighted average fixed annual rate of 2.87 percent, excluding any applicable margins. The interest rate swaps have an effective start date during February 2008, $200 million of which terminates during February 2010 and $200 million during February 2011.

On January 15, 2008, $3.8 million principal amount of the Company's 6.50% senior notes matured and were paid with borrowings under its credit facility.

          On May 6, 2008, Pioneer Southwest completed its initial public offering of 9,487,500 common units, including the over-allotment option. The Company received $163.0 million of net proceeds from Pioneer Southwest in consideration for (i) an ownership interest in a subsidiary of the Company that owned the oil and gas properties prior to the initial

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PIONEER NATURAL RESOURCES COMPANY

public offering and (ii) an additional ownership interest in certain of the same properties as a result of the exercise of the over-allotment option. The net proceeds from the initial public offering were used to reduce the Company's outstanding indebtedness. The Company will consolidate Pioneer Southwest into its financial statements and reflect the public ownership as a minority interest.

In conjunction with the completion of the initial public offering, Pioneer Southwest closed a $300 million unsecured revolving credit facility with a syndicate of banks that will mature in May 2013. See Note R of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for additional information regarding Pioneer Southwest.

As the Company pursues its strategy, it may utilize various financing sources, including fixed and floating rate debt, convertible securities, preferred stock or common stock. The Company may also issue securities in exchange for oil and gas properties, stock or other interests in other oil and gas companies or related assets. Additional securities may be of a class preferred to common stock with respect to such matters as dividends and liquidation rights and may also have other rights and preferences as determined by the Board.

Liquidity. The Company's principal source of short-term liquidity is cash on hand and unused borrowing capacity under its credit facility. There was $663 million of borrowings under the credit facility as of March 31, 2008. After deducting $45.8 million of undrawn and outstanding letters of credit under the credit facility, the Company had $791.2 million of unused borrowing capacity as of March 31, 2008.

Debt ratings. The Company receives debt credit ratings from Standard & Poor's Ratings Group, Inc. ("S&P") and Moody's, which are subject to regular reviews. S&P's rating for the Company is BB+ with a stable outlook. Moody's rating for the Company is Ba1 with a negative outlook. The Company believes that S&P and Moody's consider many factors in determining the Company's ratings including: production growth opportunities, liquidity, debt levels and asset and proved reserve mix. A reduction in the Company's debt ratings could negatively impact the Company's ability to obtain additional financing or the interest rate, fees and other terms associated with such additional financing. As of March 31, 2008, the Company was in compliance with all of its debt covenants.

Book capitalization and current ratio. The Company's book capitalization at March 31, 2008 was $5.9 billion, consisting of debt of $2.8 billion and stockholders' equity of $3.1 billion. The Company's debt to book capitalization was 48 percent at March 31, 2008 and December 31, 2007. The Company's ratio of current assets to current liabilities was 0.67 to 1.00 at March 31, 2008 as compared to 0.77 to 1.00 at December 31, 2007.

New accounting pronouncements. In September 2006, the FASB issued SFAS 157. SFAS 157 defines fair value, establishes a framework for measuring fair value and enhances disclosures about fair value measures required under other accounting pronouncements, but does not change existing guidance as to whether or not an instrument is carried at fair value. During February 2008, the FASB issued FSP FAS 157-2. FSP FAS 157-2 delays the effective date of SFAS 157 for nonfinancial assets and nonfinancial liabilities until fiscal years beginning after November 15, 2008, except for items that are recognized or disclosed at fair value in the financial statements on a recurring basis at least annually. On January 1, 2008, the Company adopted the provisions of SFAS 157 as they pertain to financial assets and liabilities. See Note D of Notes to Consolidated Financial Statements included in "Item 1 Financial Statements" for additional information regarding the Company's adoption of SFAS 157. The adoption of the provisions of SFAS 157 that were delayed by FSP FAS 157-2 is not expected to have a material effect on the financial condition or results of operations of the Company.

In February 2007, the FASB issued SFAS 159. SFAS 159 permits entities to measure many financial instruments and certain other items at fair value that are not currently required to be measured at fair value. The Company adopted the provisions of SFAS 159 on January 1, 2008 and its implementation did not have a material effect on the financial condition or results of operations of the Company.

In December 2007, the FASB issued SFAS 141(R). SFAS 141(R) replaces SFAS 141 and provides greater consistency in the accounting and financial reporting of business combinations. SFAS 141(R) requires the acquiring entity in a business combination to recognize all assets acquired and liabilities assumed in the transaction and any noncontrolling interest in the acquiree at the acquisition date, measured at the fair value as of that date. This includes the measurement of the acquirer shares issued in consideration for a business combination, the recognition of

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PIONEER NATURAL RESOURCES COMPANY

contingent consideration, the accounting for pre-acquisition gain and loss contingencies, the recognition of capitalized in-process research and development, the accounting for acquisition-related restructuring cost accruals, the treatment of acquisition-related transaction costs and the recognition of changes in the acquirer's income tax valuation allowance and deferred taxes. SFAS 141(R) is effective for fiscal years and interim periods within those fiscal years, beginning on or after December 15, 2008, and is to be applied prospectively as of the beginning of the fiscal year in which the statement is applied. The implementation of SFAS 141(R) is not expected to have a material effect on the financial condition or results of operations of the Company.

In December 2007, the FASB issued SFAS 160. SFAS 160 amends ARB No. 51, "Consolidated Financial Statements," to establish accounting and reporting standards for the noncontrolling interest in a subsidiary and for the deconsolidation of a subsidiary. SFAS 160 clarifies that a noncontrolling interest in a subsidiary, which is sometimes referred to as a minority interest, is an ownership interest in the consolidated entity that should be reported as a component of equity in the consolidated financial statements. Among other requirements, SFAS 160 requires consolidated net income to be reported at amounts that include the amounts attributable to both the parent and the noncontrolling interest. It also requires disclosure of the amounts of consolidated net income attributable to the parent and to the non-controlling interest on the face of the consolidated income statement. SFAS 160 is effective for the Company on January 1, 2009 and is not expected to have a significant impact on the Company's financial statements.

In March 2008, the FASB issued SFAS 161. SFAS 161 changes the disclosure requirements for derivative instruments and hedging activities by requiring entities to provide enhanced disclosures about (a) how and why an entity uses derivative instruments, (b) how derivative instruments and related hedged items are accounted for under SFAS 133, "Accounting for Derivative Instruments and Hedging Activities" and its related interpretations, and (c) how derivative instruments and related hedged items affect an entity's financial position, financial performance, and cash flows. SFAS 161 is effective for the Company on January 1, 2009 and is not expected to have a material effect on the financial condition or results of operations of the Company.

On May 9, 2008, the FASB issued FSP APB 14-1. FSP APB 14-1 specifies that issuers of convertible debt instruments that may be settled in cash upon conversion (including partial cash settlement) should separately account for the liability and equity components in a manner that will reflect the entity's nonconvertible debt borrowing rate when interest cost is recognized in subsequent periods.  FSP APB 14-1 is effective for financial statements issued for fiscal years beginning after December 15, 2008.  The Company is assessing the effect that FSP APB 14-1 will have on its financial condition and results of operations.

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PIONEER NATURAL RESOURCES COMPANY

Item 3.     Quantitative and Qualitative Disclosures About Market Risk

The following quantitative and qualitative disclosures about market risk are supplementary to the quantitative and qualitative disclosures provided in the Company's Annual Report on Form 10-K for the year ended December 31, 2007. As such, the information contained herein should be read in conjunction with the related disclosures in the Company's Annual Report on Form 10-K for the year ended December 31, 2007.

Although certain derivative contracts to which the Company has been a party did not qualify as hedges, the Company does not enter into derivative or other financial instruments for trading purposes.

The following table reconciles the changes that occurred in the fair values of the Company's open derivative contracts during the first quarter of 2008:

		Derivative Contract Net Liabilities (a)
		Commodities			Interest Rate			Foreign Exchange Rate			Total
		(in thousands)
Fair value of contracts outstanding as of December 31, 2007	$	(234,410	)	$	—		$	(1,500	)	$	(235,910	)
Changes in contract fair value (b)		(219,381	)		(3,319	)		1,500			(221,200	)
Contract maturities		52,792			(82	)		—			52,710
Contract terminations		56,465			—			—			56,465
Fair value of contracts outstanding as of March 31, 2008	$	(344,534	)	$	(3,401	)	$	—		$	(347,935	)

_____________

(a) Represents the fair values of open derivative contracts subject to market risk. The Company also had $108.2 million and $69.9 million of obligations under terminated derivatives as of March 31, 2008 and December 31, 2007, respectively, for which no market risk exists.

(b) At inception, derivative contracts entered into by the Company had no intrinsic value.

Foreign exchange rate sensitivity. During November 2007, the Company invested $131.7 million Canadian dollars ("CND"), representing $132.8 million U.S. dollars, in a CND-denominated escrow account associated with the sale of the Company's Canadian assets. During December 2007, the Company entered into foreign exchange rate derivatives to swap $131.7 million CND for $131.0 million U.S. dollars ("USD") to be delivered during May 2008. The foreign exchange rate swaps were economic hedges of the CND-denominated escrow account balance; however, uncertainty regarding the matching of cash flow timing between the foreign exchange rate swaps and the liquidation of the CND-denominated escrow account caused the Company not to designate the foreign exchange rate swaps as hedges. The CND-denominated escrow account was liquidated during January 2008 for $129.0 million USD, at which time the foreign exchange rate swaps were terminated at a gain of $1.8 million. Subsequent to these transactions, the Company has no remaining material foreign exchange rate risk associated with financial instruments.

Interest rate sensitivity. See Note F of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" and Capital Commitments, Capital Resources and Liquidity included in "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations" for information regarding debt transactions.

The following table provides information about financial instruments to which the Company was a party as of March 31, 2008 and that are sensitive to changes in interest rates. For debt obligations, the table presents maturities by expected maturity dates, the weighted average interest rates expected to be paid on the debt given current contractual terms and market conditions and the debt's estimated fair value. For fixed rate debt, the weighted average interest rate represents the contractual fixed rates that the Company was obligated to periodically pay on the debt as of March 31, 2008. For variable rate debt, the average interest rate represents the average rates being paid on the debt projected forward proportionate to the forward yield curve for LIBOR on May 2, 2008.

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PIONEER NATURAL RESOURCES COMPANY

Interest Rate Sensitivity

Debt Obligations as of March 31, 2008

	Nine Months Ending December 31,			Year Ending December 31,																	Liability Fair  Value at March 31,
	2008			2009			2010			2011			2012			Thereafter			Total		2008
	($ in thousands)
Total Debt:
Fixed rate principal maturities (a)	$	—		$	—		$	—		$	—		$	6,110		$	2,226,875		$	2,232,985	$	2,140,123
Weighted average interest rate		5.73	%		5.73	%		5.73	%		5.73	%		5.73	%		6.76	%
Variable rate principal maturities	$	—		$	—		$	—		$	—		$	663,000		$	—		$	663,000	$	575,681
Weighted average interest rate		3.50	%		4.20	%		4.81	%		5.14	%		5.32	%		—
Interest Rate Swaps:
Credit Facility:
Notional debt amount (b)	$	400,000		$	400,000		$	227,222		$	25,000		$	—		$	—				$	3,401
Fixed rate receivable (%)		2.75	%		3.45	%		4.06	%		4.39	%
Variable rate payable (%)		2.87	%		2.87	%		2.97	%		3.00	%	$	—		$	—

_____________

(a) Represents maturities of principal amounts excluding (i) debt issuance discounts and premiums and (ii) net deferred fair value hedge losses.

(b) Represents weighted average notional contract amounts.

Commodity price sensitivity. The following table provides information about the Company's oil and gas derivative financial instruments that were sensitive to changes in oil, NGL or gas price as of March 31, 2008. As of March 31, 2008, all of the Company's oil, NGL and gas derivative financial instruments qualified as hedges.

See Note G of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements" for information regarding the terms of the Company's derivative financial instruments that are sensitive to changes in oil, NGL or gas prices as well as hedge volumes and weighted average prices by calendar quarter.

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PIONEER NATURAL RESOURCES COMPANY

Oil, NGL and Gas Price Sensitivity

Derivative Financial Instruments as of March 31, 2008

	Nine Months Ending December 31,		Year Ending December 31,				Liability Fair Value at March 31,
	2008		2009		2010		2008
	(in thousands)
Oil Hedge Derivatives:
Average daily notional Bbl volumes:
Swap contracts		15,000		8,000		4,000	$	195,061
Weighted average fixed price per Bbl	$	65.46	$	79.43	$	85.21
Collar contracts		3,000		2,000		—	$	31,942
Weighted average ceiling price per Bbl	$	65.00	$	65.00	$	—
Weighted average floor price per Bbl	$	80.80	$	76.50	$	—
Average forward NYMEX oil prices (a)	$	114.70	$	107.93	$	104.76
NGL Hedge Derivatives:
Average daily notional Bbl volumes:
Swap contracts		1,000		1,000		1,000	$	6,220
Weighted average fixed price per Bbl	$	50.74	$	47.41	$	46.15
Average forward NYMEX NGL prices (b)	$	62.64	$	58.65	$	55.52
Gas Hedge Derivatives:
Average daily notional MMBtu volumes:
Swap contracts		210,564		19,795		5,000	$	111,311
Weighted average fixed price per MMbtu (c)	$	7.42	$	8.53	$	7.73
Average forward NYMEX gas prices (a)	$	11.11	$	10.34	$	9.57

_____________

(a) The average forward NYMEX oil and gas prices are based on May 2, 2008 market quotes.

(b) Forward Mont Belvieu NGL prices are not available as formal market quotes. These forward prices represent estimates as of May 2, 2008 provided by third parties who actively trade in the derivatives.

(c) To minimize basis risk, the Company enters into basis swaps for a portion of its gas hedges to convert the index price of the hedging instrument from a NYMEX index to an index which reflects the geographic area of production. The Company considers these basis swaps as part of the associated swap and collar contracts and, accordingly, the effects of the basis swaps have been presented together with the associated contracts.

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PIONEER NATURAL RESOURCES COMPANY

Item 4. Controls and Procedures

Evaluation of disclosure controls and procedures. The Company's management, with the participation of its principal executive officer and principal financial officer, have evaluated, as required by Rule 13a-15(b) under the Securities Exchange Act of 1934 ("the Exchange Act"), the Company's disclosure controls and procedures (as defined in Exchange Act Rule 13a-15(e)) as of the end of the period covered by this Report. Based on that evaluation, the principal executive officer and principal financial officer concluded that the design and operation of the Company's disclosure controls and procedures are effective in ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC's rules and forms and accumulated and communicated to the Company's management, including the principal executive officer and principal financial officer, to allow timely decisions regarding required disclosures.

Changes in internal control over financial reporting. There have been no changes in the Company's internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that occurred during the Company's last fiscal quarter that have materially affected or are reasonably likely to materially affect the Company's internal control over financial reporting.

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PIONEER NATURAL RESOURCES COMPANY

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

The Company is party to the legal proceedings that are described under "Legal actions" in Note J of Notes to Consolidated Financial Statements included in "Item 1. Financial Statements". The Company is also party to other proceedings and claims incidental to its business. While many of these other matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to such other proceedings and claims will not have a material adverse effect on the Company's consolidated financial position as a whole or on its liquidity, capital resources or future annual results of operations.

Item 1A. Risk Factors

In addition to the other information set forth in this Report, you should carefully consider the risks discussed in the Company's Annual Report on Form 10-K under the headings "Item 1. Business – Competition, Markets and Regulations", "Item 1A. Risk Factors" and "Item 7A. Quantitative and Qualitative Disclosures About Market Risk", which risks could materially affect the Company's business, financial condition or future results. Except as stated below, there has been no material change in the Company's risk factors from those described in the Annual Report on Form 10-K.

A subsidiary of the Company acts as the general partner of a publicly-traded limited partnership. As such, the subsidiary's operations may involve a greater risk of liability than ordinary business operations.

A subsidiary of the Company acts as the general partner of Pioneer Southwest Energy Partners L.P., a publicly-traded limited partnership formed by the Company to own and acquire oil and gas assets in its area of operations. As general partner, the subsidiary may be deemed to have undertaken fiduciary obligations to the partnership. Activities determined to involve fiduciary obligations to others typically involve a higher standard of conduct than ordinary business operations and therefore may involve a greater risk of liability, particularly when a conflict of interest is found to exist. Any such liability may be material.

The Company is subject to regulations that may cause it to incur substantial costs.

As previously disclosed in the Company's Annual Report on Form 10-K, including in "Item 1. Business — Competition, Markets and Regulations," the Company's business is regulated by a variety of federal, state, local and foreign laws and regulations. For example, our properties located in Colorado are subject to the authority of the Colorado Oil & Gas Conservation Commission (the "COGCC").  The COGCC recently published proposed rules that could increase the Company's costs of permitting and environmental compliance. The COGCC initiated formal rule-making in the first quarter of 2008, and final rules could be effective by the fourth quarter of 2008. While this regulatory development has not adversely affected the Company's operations to date, these additional rules could cause additional costs, delay and uncertainty in the Company's operations in Colorado and may be emulated in other jurisdictions in which the Company operates. There can be no assurance that present or future regulations will not adversely affect the Company's business and operations. See "Item 1. Business — Competition, Markets and Regulations" in the Annual Report on Form 10-K for additional discussion regarding government regulation.

Our expectations for future drilling activities will be realized over several years, making them susceptible to uncertainties that could materially alter the occurrence or timing.

The Company has identified drilling locations and prospects for infill drilling and enhanced recovery activities. These drilling locations and prospects represent a significant part of the Company's future drilling plans. The Company's ability to drill and develop these locations depends on a number of factors, including the availability of capital, seasonal conditions, regulatory approvals, negotiation of agreements with third parties, commodity prices, costs and drilling results. Because of these uncertainties, the Company can not give any assurance as to the timing of these activities or that they will ultimately result in the realization of proved reserves or meet the Company's expectations for success. As such, the Company's actual drilling and secondary activities may

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materially differ from the Company's current expectations, which could have a significant adverse effect on the Company's financial condition and results of operations.

These risks are not the only risks facing the Company. Additional risks and uncertainties not currently known to the Company or that it currently deems to be immaterial also may materially adversely affect the Company's business, financial condition or future results.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

The following table summarizes the Company's purchases of treasury stock during the three months ended March 31, 2008:

Period	Total Number of Shares (or Units) Purchased (a)	Average Price Paid per Share (or Unit)		Total Number of Shares (or Units) Purchased As Part of Publicly Announced Plans or Programs	Approximate Dollar Amount of Shares that May Yet Be Purchased under Plans or Programs
January 2008	—	$	—	—
February 2008	607,416	$	43.54	293,100
March 2008	5,645	$	46.87	—
Total	613,061	$	43.57	293,100	$	524,464,082

_____________

(a) Amounts include shares withheld to satisfy tax withholding on employees' share-based awards.

During 2007, the Board approved a share repurchase program authorizing the purchase of up to $750 million of the Company's common stock. During the first quarter of 2008, the Company purchased $12.8 million of common stock pursuant to the share repurchase program.

Item 5. Other Information

In connection with the initial public offering by Pioneer Southwest, the Company entered into the following agreements, among others:

Administrative Services Agreement

Pursuant an Administrative Services Agreement among Pioneer Natural Resources USA, Inc., a wholly owned subsidiary of the Company ("Pioneer USA"), Pioneer Natural Resources GP LLC, a wholly owned subsidiary of the Company and the general partner of Pioneer Southwest (the "General Partner"), Pioneer Southwest, and Pioneer Southwest Energy Partners USA LLC, a wholly owned subsidiary of Pioneer Southwest, entered into on May 6, 2008, Pioneer USA agreed to perform, either itself or through its affiliates or other third parties, administrative services for Pioneer Southwest, and Pioneer Southwest agreed to reimburse Pioneer USA for its expenses incurred in providing such services. These administrative services may include accounting, business development, finance, land, legal, engineering, investor relations, management, marketing, information technology, insurance, government regulations, communications, regulatory, environmental and human resources services. Initially, expenses will be reimbursed based on a methodology of determining Pioneer Southwest's share, on a per BOE basis, of certain of the general and administrative costs incurred by Pioneer USA. Under this initial methodology, the per BOE cost for services during any period will be determined by dividing (i) the aggregate general and administrative costs, determined in accordance with GAAP, of the Company (excluding Pioneer Southwest's general and administrative costs), for its United States operations during such period, excluding such costs directly attributable to the Company's Alaskan operations, by (ii) the sum of (x) the United States production during such period of Pioneer Southwest and the Company, excluding any production attributable to Alaskan

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PIONEER NATURAL RESOURCES COMPANY

operations, plus (y) the volumes delivered by the Company and Pioneer Southwest under all volumetric production payment obligations during such period. The costs of all awards under Pioneer Southwest's long-term incentive plan will be borne by Pioneer Southwest, and will not be included in the foregoing formula. The administrative fee will be determined by multiplying the per BOE costs by Pioneer Southwest's total production (including volumes delivered by Pioneer Southwest under volumetric production payment obligations, if any) during such period. The administrative fee may be based on amounts estimated by the Company if actual amounts are not available as determined by the Company. In addition, the Company will be reimbursed for any out-of-pocket expenses it incurs on Pioneer Southwest's behalf. The administrative services agreement can be terminated by Pioneer Southwest or Pioneer USA at any time upon 90 days notice.

Credit Agreement between Pioneer Southwest and a Syndicate of Banks

In October 2007, Pioneer Southwest entered into a $300 million unsecured revolving credit facility with a syndicate of banks, which matures in May 2013. The credit facility, which was closed on May 6, 2007, is available for general partnership purposes, including working capital, capital expenditures and distributions. Indebtedness under the credit facility bears interest initially at LIBOR plus 0.875%. The credit facility contains certain financial covenants that would be applicable to Pioneer Southwest, including (i) the maintenance of a maximum leverage ratio of not more than 3.5 to 1.00, (ii) an interest coverage ratio (representing a ratio of earnings before depreciation, depletion and amortization; impairment of long-lived assets; exploration expense; accretion of discount on asset retirement obligations; interest expense; income taxes; gain or loss on the disposition of assets; noncash commodity hedge related activity; and noncash equity-based compensation to interest expense) of not less than 2.5 to 1.0 and (iii) the maintenance of a ratio of the net present value of Pioneer Southwest's projected future cash flows from its proved reserves to total debt of at least 1.75 to 1.0. Because of the net present value covenant, borrowings under the PSE Credit Agreement would be expected to be initially limited to approximately $200 million. In addition, the credit facility contains various covenants that limit, among other things, Pioneer Southwest's ability to grant liens, incur additional indebtedness, engage in a merger, enter into transactions with affiliates, pay distributions or repurchase equity, and sell its assets. If any default or event of default (as defined in the credit facility) were to occur, the credit facility would prohibit Pioneer Southwest from making distributions to unitholders. Such events of default include, among others, nonpayment of principal or interest, violations of covenants, bankruptcy and material judgments and liabilities.

First Amended and Restated Agreement of Limited Partnership of Pioneer Southwest Energy Partners L.P. (the "PSE Partnership Agreement")

The PSE Partnership Agreement was entered into by the General Partner, in its capacity as the general partner of Pioneer Southwest and on behalf of the limited partners of Pioneer Southwest, and Pioneer USA, as the "Organizational Limited Partner," on May 6, 2008, and governs the rights of the partners in Pioneer Southwest. A description of the PSE Partnership Agreement appears under the caption, "The Partnership Agreement," at pages 125 through 135 of Pioneer Southwest’s final prospectus dated April 30, 2008 (No. 333-144868), which Pioneer Southwest filed on May 1, 2008 with the SEC pursuant to Rule 424(b) of the Securities Act of 1933, and which description is incorporated in this Report by reference.

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Item 6. Exhibits

Exhibits

Exhibit Number		Description
10.1	—	First Amended and Restated Agreement of Limited Partnership of Pioneer Southwest Energy Partners L.P. dated May 6, 2008, between Pioneer Natural Resources GP LLC, as the General Partner, and Pioneer Natural Resources USA, Inc., as the Organizational Limited Partner, together with any other persons who become Partners (as defined in such agreement) in the Partnership (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K, File No. 001-34032, of Pioneer Southwest Energy Partners L.P. filed with the SEC on May 9, 2008).
10.2	—	Administrative Services Agreement, dated effective May 6, 2008, among Pioneer Natural Resources GP LLC, Pioneer Southwest Energy Partners L.P., Pioneer Southwest Energy Partners USA LLC, and Pioneer Natural Resources USA, Inc. (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K, File No. 001-34032, of Pioneer Southwest Energy Partners L.P. filed with the SEC on May 9, 2008).
10.3	—	Credit Agreement entered into as of October 29, 2007, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.4	—	Amendment to Credit Agreement dated as of December 14, 2007, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.8 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.5	—	Second Amendment to Credit Agreement dated as of February 15, 2008, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.13 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.6	—	Third Amendment to Credit Agreement dated as of April 15, 2008, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.15 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.7(a)	—	Contract for Services dated as of April 1, 2008, between Pioneer Natural Resources USA, Inc. and A. R. Alameddine.
31.1(a)	—	Chief Executive Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
31.2 (a)	—	Chief Financial Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
32.1 (b)	—	Chief Executive Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.
32.2 (b)	—	Chief Financial Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.

_____________

(a) Filed herewith.

(b) Furnished herewith.

55

PIONEER NATURAL RESOURCES COMPANY

SIGNATURES

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

PIONEER NATURAL RESOURCES COMPANY

Date:    May 9, 2008	By:	/s/ Richard P. Dealy
		Richard P. Dealy
		Executive Vice President and Chief
		Financial Officer
Date:    May 9, 2008	By:	/s/ Darin G. Holderness
		Darin G. Holderness
		Vice President and Chief
		Accounting Officer

56

PIONEER NATURAL RESOURCES COMPANY

Exhibit Index

Exhibit Number		Description
10.1	—	First Amended and Restated Agreement of Limited Partnership of Pioneer Southwest Energy Partners L.P. dated May 6, 2008, between Pioneer Natural Resources GP LLC, as the General Partner, and Pioneer Natural Resources USA, Inc., as the Organizational Limited Partner, together with any other persons who become Partners (as defined in such agreement) in the Partnership (incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K, File No. 001-34032, of Pioneer Southwest Energy Partners L.P. filed with the SEC on May 9, 2008).
10.2	—	Administrative Services Agreement, dated effective May 6, 2008, among Pioneer Natural Resources GP LLC, Pioneer Southwest Energy Partners L.P., Pioneer Southwest Energy Partners USA LLC, and Pioneer Natural Resources USA, Inc. (incorporated by reference to Exhibit 10.2 to the Current Report on Form 8-K, File No. 001-34032, of Pioneer Southwest Energy Partners L.P. filed with the SEC on May 9, 2008).
10.3	—	Credit Agreement entered into as of October 29, 2007, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.1 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.4	—	Amendment to Credit Agreement dated as of December 14, 2007, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.8 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.5	—	Second Amendment to Credit Agreement dated as of February 15, 2008, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.13 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.6	—	Third Amendment to Credit Agreement dated as of April 15, 2008, among Pioneer Southwest Energy Partners L.P., as the Borrower, Bank of America, N.A., as Administrative Agent, and certain other lenders (incorporated by reference to Exhibit 10.15 to the Registration Statement on Form S-1 (No. 333-144868) of Pioneer Southwest Energy Partners L.P. and incorporated herein by reference).
10.7(a)	—	Contract for Services dated as of April 1, 2008, between Pioneer Natural Resources USA, Inc. and A. R. Alameddine.
31.1(a)	—	Chief Executive Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
31.2 (a)	—	Chief Financial Officer certification under Section 302 of Sarbanes-Oxley Act of 2002.
32.1 (b)	—	Chief Executive Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.
32.2 (b)	—	Chief Financial Officer certification under Section 906 of Sarbanes-Oxley Act of 2002.

_____________

(a) Filed herewith.

(b) Furnished herewith.

57

EX-10

EXHIBIT 10.7

CONTRACT FOR SERVICES

This Contract for Services (this “Agreement”) is entered into by and between Pioneer Natural Resources USA, Inc. (“Company”) and A. R. Alameddine (“Contractor”). Company hereby engages the services of Contractor, upon the following terms and conditions:

(1) Services. Pursuant to each of the provisions of this Agreement, Contractor shall provide consulting services to the Company in connection with the Company's evaluation and pursuit of prospects in the country of Iraq and the Company's operations in the country of Tunisia (the “Services” or the “Project”); provided, however, in no event shall Contractor be obligated to perform services for the Company hereunder at a level that would, during the term of this Agreement, require Contractor to provide aggregate services to the Company in excess of forty-nine percent (49%) of the average hours performed by Contractor while an employee of the Company over the 12 month period immediately preceding the termination of his employment with the Company (the “Maximum Commitment”). The Company and Contractor agree that they have established the Maximum Commitment so that Contractor will be deemed to have incurred a separation from service pursuant to, and in accordance with the regulations promulgated under, Section 409A of the Internal Revenue Code of 1986, as amended. The parties agree to apply the Maximum Commitment for all purposes with respect to the determination of whether Contractor has incurred such a separation from service.

(2)        Term of Agreement. This Agreement shall commence on April 1, 2008 (the “Commencement Date”) and shall remain in force until, and, subject to the provisions of Section 9, shall terminate automatically on March 31, 2009 (the “Termination Date”); provided, however, that any termination will not affect any of the obligations that expressly extend beyond the term of this Agreement, including the obligations contained in Sections 18 and 19.

(3)        Terms of Payment. All payments made to Contractor hereunder shall be made only in connection with the performance of the Services or completion of the Project described in Section 1 above. Company shall pay Contractor for: (a) service fees in the amount of $210,000 as follows: (i) lump sum of $110,000 on October 1, 2008, and (ii) the remaining $100,000 payable in six monthly payments of $16,666.67 beginning with the first payment on October 31, 2008 and ending with the last payment on March 31, 2009, and (b) Travel Expenses, as defined in this Section, of Contractor. For clarification purposes, the total number of hours includes hours worked and hours in transit. As used herein, “Travel Expenses” means documented business related travel expenses and standard business-type lodging expenses including first class international air travel. Company shall reimburse Contractor only for Travel Expenses invoiced by Contractor and for which reasonable backup documentation in the form of receipts and the like is provided along with such invoice. To enable Company to take advantage of any available discount rates, upon request by Company, by notice or other reasonable means, Contractor shall book all travel and lodging through a travel agency and/or with carriers or hotels designated by Company for direct billing to Company.

(4)        Contingent Supplemental Compensation and Related Benefits. In recognition of Contractor’s long, outstanding and dedicated service to the Company, and Contractor’s willingness to provide the Services following his retirement from the Company on the terms and conditions set forth herein, the Company agrees that, if, on or prior to September 30, 2008, there shall occur a Potential Change in Control (as defined in paragraph 3 of the Change in Control Agreement dated August 16, 2005 between Contractor and the Company (the “CIC Agreement”)), and within twelve months following such Potential Change in Control there occurs a Change in Control (as defined in paragraph 3 of the CIC Agreement) that also constitutes a change in the ownership or effective control of the Company as defined in the regulations promulgated pursuant to Section 409A of the Internal Revenue Code (a “Qualifying Change in Control”), then the Company shall pay the Supplemental Compensation (as defined below) to

Contractor or, in the event of his death, to his estate, within 30 days of the occurrence of such a Qualifying Change in Control. The term Supplemental Compensation shall mean an amount equal to the sum of (i), (ii) and (iii) below:

(i) the remainder of (A) the Separation Payment that would have been payable to Contractor pursuant to paragraph 5(c)(6) of the CIC Agreement had Contractor’s employment continued until such Qualifying Change in Control and been terminated immediately thereafter by the Company without Cause, minus (B) the amount payable to Contractor upon his retirement pursuant to paragraph 4(a) of the severance agreement with the Company signed by the Contractor while an employee of the Company;

(ii) the product of (A) the closing value of a share of the Company’s common stock on the date that the Qualifying Change in Control occurs and (B) the number of restricted shares of the Company’s common stock that were subject to Restricted Stock Award Agreements dated February 14, 2006 and February 26, 2007 between Contractor and the Company that were not vested immediately prior to or in connection with Contactor’s retirement from service with the Company on March 31, 2008;

(iii) the product of the closing value of a share of the Company’s common stock on the date that the Qualifying Change in Control occurs and (B) the remainder of (1) the number of shares of the Company’s common stock to which Contractor would have been entitled pursuant to Section 5(a) of the Performance Unit Award Agreement dated February 26, 2007 between Contractor and the Company (the “Performance Unit Agreement”) had Contractor been employed by the Company on the date that the Qualifying Change in Control occurs minus (2) the number of shares to which Contractor is actually entitled pursuant to Section 5(b) of the Performance Unit Agreement.

If Contractor becomes entitled to receive the Supplemental Compensation in accordance with this Section 4, then Contractor shall also be entitled to receive from the Company any additional payments that would have been payable in accordance with paragraph 5(e) of the CIC Agreement had his employment been terminated by the Company without Cause on the date such Qualifying Change in Control.

(5)        Audit. Company shall have the right to audit the books and records of Contractor relating to Company’s payment for Services and Travel Expenses for the sole purpose of verifying the amounts due and payable hereunder, once per calendar year, upon five (5) business days notice to Contractor. Contractor shall maintain business records, books, account information, and related materials sufficient to permit Company to conduct such audits. The cost of any audit shall be at Company’s expense.

(6)        Contractor Representations. Notwithstanding any limitations or disclaimers otherwise contained herein, Contractor represents that Contractor has attained the requisite educational and experience level to permit him or her satisfactorily to perform such Services, and Contractor agrees to perform said Services in a professional and workmanlike manner.

(7)        Taxes. Contractor shall not be treated as an employee of Company with respect to the Services performed hereunder for federal or state tax purposes. Contractor shall protect, defend, indemnify and hold Company and its officers, directors, and employees harmless from and against any and all liability, claims, demands, proceedings and causes of action by or on behalf of any state or federal governmental administrative agencies for any such taxes.

(8)        Insurance. Except as set forth in Section 28, Contractor shall be responsible for all of his or her own insurance and Company shall have no responsibility for any insurance coverage for Contractor, including worker’s compensation insurance.

(9)        Termination With Cause. Subject to the provisions of Section 2, with reasonable cause, either party may terminate this Agreement effective immediately upon the giving of written notice of intent to terminate for cause. Reasonable cause shall include any breach of this Agreement by the other party and the failure of such other party to cure such breach within twenty (20) days of notice thereof.

(10)       Non-Waiver. The failure of either party to exercise any of its rights under this Agreement for a breach thereof shall not be deemed a waiver of such rights or waiver of any subsequent breach.

(11)       Security. In the event Contractor is required to travel to a foreign country to perform the Services set forth in Section 1, Company, at Company's expense, shall provide Contractor security measures during Contractor's stay in such country similar to the security measures that were provided to Contractor while an employee of the Company, including evacuation from such country in the event of unrest. In no event shall Contractor, in the performance of the Services, be required to travel to any country with respect to which the U.S. Department of State is then maintaining a travel warning.

(12)         Intellectual Property Rights.

(a)        Company represents and warrants that any and all data, information, documents, materials, supplies and equipment provided by it to Contractor, or any method, process or technique which Company requires Contractor to use, is the rightful property of Company or Company has full right to supply such items to Contractor. Company agrees to defend, indemnify and hold Contractor harmless from and against any damage, loss, cost and/or expense (including attorneys fees) resulting from a breach of this representation and warranty.

(b)       Contractor agrees that all intellectual property, including but not limited to all ideas and concepts contained in computer programs and software, documentation or other literature or illustrations that are conceived, developed, written, or contributed by Contractor pursuant to this Agreement, either individually or in collaboration with others, shall belong to and be the sole property of Company. Contractor further agrees that all rights in all works prepared or performed by Contractor pursuant to this Agreement shall belong exclusively to Company and shall constitute "works made for hire'' for purposes of copyright law. The provisions of this Section shall not be construed to assign to Company any of Contractor's rights in any work, concept, invention or idea for which no equipment, supplies, facilities, or trade secret information of Company was used, that was developed entirely on Contractor's own time, and that:

(i)        does not relate at the time of conception or reduction to practice of the invention to Company's business or to Company's actual or demonstrably anticipated research or development; or

(ii)        does not result from any work performed by Contractor for Company.

(13)       No Authority to Bind Company. Other than as specifically designated in writing from time to time, Contractor has no authority to enter into any contracts or agreements on behalf of Company. This Agreement does not create a partnership, joint venture, or joint undertaking of any kind between the parties.

(14)       Declaration of Independent Contractor Status. Contractor declares Contractor is engaged in his or her own independently established business, and as such, Contractor has complied with all federal, state, and local laws regarding business permits, certificates, and licenses that may be required to carry out the work to be performed under this Agreement. Except as provided in Section 19, as an independent contractor, Contractor will be free to contract for similar services and provide such services to other individuals and other businesses without the consent of Company, express or implied. Neither Company, nor its agents or representatives, shall have a right to control or direct the manner, details, or

means by which Contractor accomplishes and performs the Services. The risk of loss in Contractor’s business shall be borne entirely by Contractor. Company shall have no right to inquire as to the profit generated by Contractor in the performance of Contractor’s business except with respect to the reimbursement by Company to Contractor of reasonable expenses incident to the provision of the Services pursuant to Section 5.

(15)       Benefits. Because Contractor is engaged in his or her own independently established business, Contractor is not eligible for, and shall not participate in, any employee pension, health, or other fringe or welfare benefit plans of Company, except to the extent Contractor, as a former employee of the Company, elects continuation of coverage under the Consolidated Omnibus Budget Reconciliation Act of 1985 ("COBRA"). Contractor acknowledges that he or she shall not be entitled to any other benefit provided by Company to its employees including, but not limited to, sick leave, vacation, or jury duty pay. Contractor shall hold Company and its officers, directors, and employees harmless from and against any and all liability, claims or demands for any such employment benefit, except for the coverage under COBRA if elected by Contractor.

(16)       Choice of Forum and Law. It is the intention of the parties that the laws of the State of Texas should govern the validity of this Agreement, the construction of its terms, and the interpretation of the rights and duties of the parties hereto without regard to any contrary conflicts of laws principles. The agreed upon venue and personal jurisdiction for the parties on any claims or disputes under this Agreement is Dallas County, Texas.

(17)       Equipment, Materials, or Supplies. Company shall be responsible, as required, for providing all equipment, materials, or supplies necessary for the performance of the Services.

(18)       Confidential Information. Contractor recognizes that any information furnished by Company to Contractor pursuant to this Agreement, or obtained by Contractor as a result of the performance of Services under this Agreement, is confidential. Accordingly, any and all information from any source developed or obtained during, or resulting from, the performance of Contractor’s duties shall be considered by Contractor to be confidential and shall not be published, stated, disclosed or used by Contractor for any purpose whatsoever without Company’s prior written consent and waiver of confidentiality. Contractor agrees that all reports, information, documentation, and contractual rights associated with any Project for which Contractor performs the Services described in Section 1 shall be for the exclusive benefit of Company and/or Company’s clients and Contractor shall not divulge information in any way related to the Services provided hereunder. The provisions of this Section 18 shall survive the Termination Date for a period of three (3) years.

(19)       Restrictions on Activities. Contractor agrees that the following covenants are reasonable and necessary agreements for the protection of Company's business interests

(a)        During the period beginning on the Commencement Date and ending on the Termination Date, Contractor shall not, without prior written consent of Company, directly or indirectly engage in, carry on or assist, individually or as a principal, owner, officer, director, employee, shareholder, promoter, consultant, contractor, partner, member, joint venturer, agent, equity owner, lender or in any other capacity whatsoever, any business enterprise that is directly competitive with Company or any affiliate thereof in any of Company's current areas of operations, or in any other area in which the Company is currently contemplating operational entry, as disclosed to Contractor on or prior to the Commencement Date.

(b)       During the period beginning on the Commencement Date and ending on the one year anniversary of the Termination Date, Contractor shall not, without prior written consent of the Company, directly or indirectly engage in, carry on or assist, individually or as a principal, owner, officer, director, employee, shareholder, promoter, consultant, contractor, partner, member, joint

venturer, agent, equity owner, lender or in any other capacity whatsoever, any business enterprise that is directly competitive with Company or any affiliate thereof in the countries of Iraq and Tunisia.

(c)        Contractor agrees and acknowledges that engaging in the activities prohibited by this Section would necessarily involve the use and/or disclosure of the Company’s confidential information, in violation of this Agreement.

(20)       Cooperation in Investigation. Contractor agrees to continue to assist Company and cooperate fully with respect to any matters for which Contractor was responsible during the term of this Agreement. Contractor also agrees that Contractor will voluntarily comply with the Company’s reasonable requests for Contractor's attendance at meetings, court hearings, trials, or other events relating to or in connection with any legal proceedings to which Company is a party for a two year period following the Termination Date. Contractor shall be reimbursed for all reasonable expenses incurred in connection with Contractor's performance under this Section.

(21) Contractor's Compliance.

Contractor agrees to comply with all laws (including common law), rules, regulations, ordinances, judgments, orders and other official acts of any governmental authority (federal, state, municipal, foreign and other agencies or regulatory bodies) which are now or may, in the future, become applicable to the Contractor, Contractor’s business, equipment and personnel engaged in the performance of this Agreement, or arising out of or incident to such performance; provided however, notwithstanding anything to the contrary in this Agreement, the Contractor shall not take any action that is prohibited by or penalized under the laws or regulations of the United States.

In recognition of the principles of the U.S. Foreign Corrupt Practices Act (“FCPA”) and its prohibitions (“FCPA Prohibitions”), Contractor acknowledges that it is familiar with and understands the FCPA and the FCPA Prohibitions. Contractor represents, warrants and covenants and that he has not, and will not, violate the FCPA Prohibitions in connection with this Agreement or any work on behalf of Company. Contractor further represents, warrants and covenants that he has not made, offered, promised or authorized (and will not make, offer, promise or authorize) payment of any money, gift or other thing of value, in connection with this Agreement or any work on behalf of Company, directly or indirectly, to any Foreign Official, or to any person while knowing or believing that all or a portion of such money or thing of value will be offered, given, or promised, directly or indirectly, to any Foreign Official, for the purpose of (i) influencing any act or decision of such Foreign Official, (ii) inducing such Foreign Official to do or omit to do any act in violation of the Foreign Official’s lawful duty, (iii) securing an improper advantage, or (iv) inducing such Foreign Official to use his influence with a foreign government or instrumentality thereof to affect or influence any act or decision of such government or instrumentality. For the purpose of this Section 21, a “Foreign Official” means any (i) officer, director, agent, representative, or employee of a (a) foreign government, (b) department, agency or instrumentality of a foreign government (including any state owned or controlled company), or (c) public international organization, (ii) person acting in an official capacity for or on behalf of such foreign government, foreign department, agency or instrumentality or public international organization; (iii) candidate for foreign political office; or (iv) foreign political party or official thereof.

The Company’s Code of Business Conduct and Ethics (the “Code) can be viewed at www.pxd.com under the “Governance” tab.  Contractor acknowledges that it has read and understands the Code and agrees to be bound by the terms thereof.

At least annually and from time to time at the Company’s request, Contractor agrees to certify his compliance with this Section 21, the FCPA and the Company’s compliance policies. Company shall have

the right, upon written notice to Contractor, to conduct an investigation and audit of Contractor to verify compliance with the provisions of this Section 21. Contractor agrees that he shall cooperate fully with such investigation by among other measures, upon Company’s request, giving Company reasonable access to Contractor’s books, records and employees and providing documentation related to Company, this Agreement or Contractor’s compliance with this Section 21. Company may withhold any payments due under this Agreement pending such access.

Contractor agrees that should he learn of or have reason to know of (i) any payment, offer, promise or authorization to make a payment of money, gift or other thing of value to a Foreign Official in violation of the FCPA; or (ii) any other development that in any way makes inaccurate or incomplete the representations, warranties, covenants and certifications hereunder given or made at any time during the term of this Agreement, Contractor will immediately advise Company of such knowledge or suspicion and the entire basis known to Contractor therefore.

Contractor agrees that full disclosure of information relating to a possible violation of this Agreement, including the existence, terms and compensation provisions of this Agreement, may be made by Company at any time and for any reason to the U.S. government and its agencies, and to whomsoever Company determines has a legitimate need to know.

Contractor acknowledges and agrees that Company’s decision to enter into this Agreement is conditioned upon Company’s belief that Contractor will comply with the FCPA, applicable laws, and the Company’s compliance policies. If at any time Company should believe, in good faith, that Contractor has acted or failed to act in any way that may subject Company to liability under any applicable bribery law, Company shall have the unilateral right, exercisable immediately and in its sole discretion upon written notice to Contractor:

(a) to refuse to make any additional payments to Contractor, any other provision of this Agreement notwithstanding; and/or,

(b) to terminate this Agreement immediately, any other provision of this Agreement notwithstanding.

Contractor shall not (i) retain any representatives or other agents on behalf of Company, or (ii) make or cause to be made any payments to any such representatives or other agents, without the express prior written approval of Company.

Contractor acknowledges and agrees that it has no authority to represent Company or act on Company’s behalf with respect to any Foreign Official, and Contractor covenants that in performing the Services hereunder, it will not approach any Foreign Official, without first obtaining the prior written approval of Company.

(22)       Release. In consideration for the promises contained in this Agreement, and expressly contingent on Contractor's rights to receive and retain the payments referenced in Section 3 hereof, upon executing this Agreement (as to matters concerning Contractor's employment with the Company, and the termination thereof) and again following the Termination Date (as to matters arising in connection with this Agreement and Contractor's provision of Services), Contractor agrees to execute the release agreement in substantially the same form and substance as the release agreement attached hereto as Exhibit A.

(23)       Survival. All provisions of this Agreement, which by their nature extend beyond the Termination Date, such as, without limitation, those concerning defense and indemnification, confidential information and intellectual property rights, shall survive the Termination Date until fulfilled and shall apply to either party’s successors and assigns.

(24)       Severability. If any part of this Agreement shall be held to be unenforceable, the rest of the Agreement will nevertheless remain in full force and effect.

(25)       Amendments. This Agreement may be supplemented, amended, or revised only by further written agreement signed by both parties.

(26)       Notices. Any notice provided or permitted to be given under this Agreement shall be in writing, and may be served by personal delivery or by registered or certified U.S. mail, addressed to the party to be notified, postage prepaid, return receipt requested. Notice deposited in the mail in the manner described shall be deemed to have been given and received on the date of the delivery as shown on the return receipt. Notice served in any other manner shall be deemed to have been given and received only if and when actually received by the addressee. For purposes of notice, the addresses of the parties shall be as follows.

COMPANY:

Pioneer Natural Resources USA, Inc.

200 Williams Square West

5205 N. O’Connor Blvd.

Irving, Texas 75039-3764

Attention: Scott Sheffield

Telephone: 972-969-4003

e-mail: scott.sheffield@pxd.com

CONTRACTOR:

A. R. Alameddine

3820 Portsmouth Circle

Plano, Texas 75023

Telephone: 214-755-5515

Email: alamedda@aol.com ;

ar.alameddine@pxd.com

(27)       Arbitration. Any dispute or controversy arising under or in connection with this Agreement shall be resolved by binding arbitration; provided, however, notwithstanding this Section, the Company may pursue a temporary restraining order and/or preliminary injunctive relief in accordance with Section 19, with related expedited discovery for the parties, in a court of law, and, thereafter, require arbitration of all issues of final relief. The arbitration shall be held in Dallas, Texas and except to the extent inconsistent with this Agreement, shall be conducted in accordance with the Expedited Employment Arbitration Rules of the American Arbitration Association then in effect at the time of the arbitration, and otherwise in accordance with principles which would be applied by a court of law or equity. The arbitrator shall be acceptable to both the Company and Contractor. If the parties cannot agree on an acceptable arbitrator, the dispute shall be heard by a panel of three arbitrators, one appointed by each of the parties and the third appointed by the other two arbitrators. The arbitrator may award pre-judgment interest on any amount found to be due under this Agreement at a rate not in excess of the rate that would be payable with respect to judgments rendered in a Texas state court.

(28)       Life Insurance Benefit. The Company will arrange a life insurance benefit in the amount of $692,000 payable to Contractor's designated beneficiary in the event of Contractor's death during the term of this Agreement. Contractor agrees to pay the premium for such benefit in the amount of $5,481.00, which amount shall be deducted from the first service fee payment made to Contractor pursuant to Section 3 of this Agreement. Contractor agrees to cooperate with the Company to the extent reasonably necessary to arrange such benefit, including submitting to a physical examination if required by any insurance carrier or underwriter.

EXECUTED this 1st day of April, 2008.

COMPANY:
PIONEER NATURAL RESOURCES USA, INC.
By:	/s/ Scott D. Sheffield
Printed Name:	Scott D. Sheffield
Its:	Chief Executive Officer
CONTRACTOR:
A.R. ALAMEDDINE
/s/ A.R. Alameddine

EXHIBIT A

GENERAL RELEASE AGREEMENT

NOTICE: You should thoroughly review and understand the effect of this General Release Agreement (“Release”) before signing it, and you are hereby advised to discuss this document with your attorney. In accordance with the requirements of the Older Workers Benefit Protection Act (“OWBPA”), you are allowed at least 21 days from the date of your receipt of this document to consider the offer made to you and to return an executed copy of this Release to the Vice President of Administration. Additionally, after you have executed this Release, you have seven (7) days to reconsider and revoke your agreement.

GENERAL RELEASE: In consideration of my acceptance of the payments and benefits offered to me under the Contract for Services with Pioneer Natural Resources USA, Inc. with an effective date of April 1, 2008 (the “Agreement”), I hereby release and discharge Pioneer Natural Resources Company (the “Company”) and its subsidiaries and affiliates, and the officers, directors, employees, agents, predecessors, successors, and assigns of such entities (collectively the “Released Parties) from any and all claims, liabilities, demands, and causes of action, known or unknown, fixed or contingent, which I have or claim against any of them as a result of my employment, the termination of my employment, or any other act or omission relating to any matter arising on or before April 1, 2008, including but not limited to claims arising under federal, state, or local laws prohibiting employment discrimination, including, but not limited to, the Age Discrimination in Employment Act, and including, but not limited to, claims arising out of any legal restrictions, contractual or otherwise, on the Company’s right to terminate the employment of its employees (any and all “Potential Claims”).

I understand that this Release is final and binding.

I acknowledge and agree that the Company has no legal obligation to provide the payments and/or benefits offered to me under the Agreement, except in exchange for this Release, and my acceptance of such payments and benefits constitutes my agreement to all terms and conditions set forth in this Release.

I acknowledge and agree that, except to the extent otherwise provided in the Agreement or prohibited by law, this Release constitutes a waiver of any and all Potential Claims that I have or may have against the Released Parties. I further acknowledge and agree that this Release has no effect on any obligations I have assumed under the Agreement and my Severance Agreement with Pioneer Natural Resources USA, Inc. with respect to confidentiality, non-solicitation, non-interference and other such matters and that any such obligations shall survive my execution of this Release in accordance with the terms of the Agreement and Severance Agreement.

I acknowledge that I have 21 days to consider this Release before executing it, although I may execute it any time during this 21 day period (but not before my last day of employment), that I may revoke this Release within 7 days after I execute it by written notice to the Company’s Vice President of Administration and that this Release will not become effective or enforceable, and the payments and benefits offered under the Agreement will not be made or provided, until expiration of this 7 day period without my revocation.

I have carefully read and fully understand all of the provisions of this Release. I further acknowledge that entering into this General Release Agreement is knowing and voluntary on my part, that I have had a reasonable time to deliberate regarding its terms, and that I have had the right to consult with an attorney prior to executing this Release if I so desired. This Release is effective April 2, 2008, unless revoked in accordance with the first paragraph.

_________________________________________ Date signed:	__________________________________________________________ Signature of A.R. Alameddine
_________________________________________ Date signed:	__________________________________________________________ Witness

EX-31

EXHIBIT 31.1

CHIEF EXECUTIVE OFFICER CERTIFICATION

I, Scott D. Sheffield, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Pioneer Natural Resources Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

May 9, 2008
	/s/ Scott D. Sheffield
	Scott D. Sheffield, Chairman and
	Chief Executive Officer

EX-31

EXHIBIT 31.2

CHIEF FINANCIAL OFFICER CERTIFICATION

I, Richard P. Dealy, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Pioneer Natural Resources Company;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

May 9, 2008
	/s/ Richard P. Dealy
	Richard P. Dealy, Executive Vice President
	and Chief Financial Officer

EX-32

EXHIBIT 32.1

CERTIFICATION OF

CHIEF EXECUTIVE OFFICER

OF PIONEER NATURAL RESOURCES COMPANY

PURSUANT TO 18 U.S.C. § 1350

I, Scott D. Sheffield, Chairman and Chief Executive Officer of Pioneer Natural Resources Company (the "Company"), hereby certify that the accompanying Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2008 and filed with the Securities and Exchange Commission pursuant to Section 13(a) of the Securities Exchange Act of 1934 (the "Report") by the Company fully complies with the requirements of that section.

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Scott D. Sheffield
Name:	Scott D. Sheffield, Chairman and
	Chief Executive Officer
Date:	May 9, 2008

EX-32

EXHIBIT 32.2

CERTIFICATION OF

CHIEF FINANCIAL OFFICER

OF PIONEER NATURAL RESOURCES COMPANY

PURSUANT TO 18 U.S.C. § 1350

I, Richard P. Dealy, Executive Vice President and Chief Financial Officer of Pioneer Natural Resources Company (the "Company"), hereby certify that the accompanying Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2008 and filed with the Securities and Exchange Commission pursuant to Section 13(a) of the Securities Exchange Act of 1934 (the "Report") by the Company fully complies with the requirements of that section.

I further certify that the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

	/s/ Richard P. Dealy
Name:	Richard P. Dealy, Executive Vice
	President and Chief Financial Officer
Date:	May 9, 2008