UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 10-K
ýANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the fiscal year ended December 31, 20172020
or
¨TRANSITION 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
PIONEER NATURAL RESOURCES COMPANY
(Exact name of registrant as specified in its charter)

Delaware75-2702753
(State or other jurisdiction of
incorporation or organization)
incorporation)
(I.R.S. Employer
Identification No.)
5205 N. O'Connor Blvd., Suite 200, Irving, Texas75039
(Address of principal executive offices)(Zip Code)

777 Hidden Ridge
Irving, Texas 75038
(Address of principal executive offices and zip code)
(972) 444-9001
(Registrant's telephone number, including area code: (972) 444-9001code)

Securities registered pursuant to Section 12(b) of the Act:
Title of each classTrading SymbolName of each exchange on which registered
Common Stock, par value $.01 per sharePXDNew York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None
Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes  ý    No  ¨
Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes  ¨    No  ý
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  ý    No  ¨
Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  ý    No  ¨
Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant's knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.ý
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer"filer," "smaller reporting company," and "smaller reporting"emerging growth company" in Rule 12b-2 of the Exchange Act.
Large accelerated filerýAccelerated filero
Non-accelerated filer
o  (Do not check if a smaller reporting company)
Smaller reporting companyo
Emerging growth company
If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ¨
Indicate by check mark whether the registrant has filed a report on and attestation to its management's assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report.    
Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).     Yes   ¨    No   ý
Aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter$26,939,176,465
  
Number of shares of Common Stock outstanding as of February 14, 2018170,300,825
Aggregate market value of the voting and non-voting common equity held by non-affiliates computed by reference to the price at which the common equity was last sold, or the average bid and asked price of such common equity, as of the last business day of the registrant's most recently completed second fiscal quarter$15,947,085,822
Number of shares of Common Stock outstanding as of February 22, 2021216,580,280
DOCUMENTS INCORPORATED BY REFERENCE:
(1)Portions of the Definitive Proxy Statement for the Company's Annual Meeting of Shareholders to be held during May 2018 are incorporated into Part III of this report.

(1)Portions of the Definitive Proxy Statement for the Company's Annual Meeting of Shareholders to be held in May 2021 are incorporated into Part III of this Report.
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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.
feet and is a measure of 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 six thousand cubic feet of gas to one Bbl of oil or natural gas liquid.
"BOEPD"means BOE per day.
"Brent" means Brent oil price, a major trading classification of light sweet oil that serves as a benchmark price for oil worldwide.
"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.
"Conway"means the daily average natural gas liquids components as priced in Oil Price Information Services ("OPIS") in the table "U.S. and Canada LP – Gas Weekly Averages" at Conway, Kansas.
"DD&A" means depletion, depreciation and amortization.
"ESG"means environmental, social and governance.
"Field fuel" means gas consumed to operate field equipment (primarily compressors) prior to the gas being delivered to a sales point.
"GAAP" means accounting principles that are generally accepted in the United States of America.
"GHG" means green housegreenhouse gases.
"HH"HH" means Henry Hub, a distribution hub on the natural gas pipeline in Louisiana that serves as the delivery location for gas futures contracts on the NYMEX.
"LIBOR" means London Interbank Offered Rate, which is a market rate of interest.
"LLS" means Louisiana light sweet oil, a light, sweet blend of oil produced from the Gulf of Mexico.
"MBbl" means one thousand Bbls.
"MBOE" means one thousand BOEs.
"Mcf" means one thousand cubic feet and is a measure of gas volume.
"MMBbl" means one million Bbls.
"MMBOE" means one million BOEs.
"MMBtu" means one million Btus.
"MMcf"means one million cubic feet.
"Mont Belvieu" means the daily average natural gas liquids components as priced in OPIS in the table "U.S. and Canada LP – Gas Weekly Averages" at Mont Belvieu, Texas.
"NGL"NGLs" means natural gas liquid.
liquids, which are the heavier hydrocarbon liquids that are separated from the gas stream; such liquids include ethane, propane, isobutane, normal butane and natural gasoline.
"NYMEX" means the New York Mercantile Exchange.
"NYSE" means the New York Stock Exchange.
"OPEC" means the Organization of Petroleum Exporting Countries.
"Pioneer" or the "Company" means Pioneer Natural Resources Company and its subsidiaries.
"Proved developed reserves" mean means reserves that can be expected to be recovered through existing wells with existing equipment and operating methods or in which the cost of the required equipment is relatively minor compared to the cost of a new well.
"Proved reserves" mean means those quantities of oil and gas, which, by analysis of geosciences and engineering data, can be estimated with reasonable certainty to be economically producible – from a given date forward, from known reservoirs, and under existing economic conditions, operating methods, and government regulations – prior to the time at which contracts providing the right to operate expire, unless evidence indicates that renewal is reasonably certain, regardless of whether deterministic or probabilistic methods are used for the estimation. The project to extract the hydrocarbons must have commenced or the operator must be reasonably certain that it will commence the project within a reasonable time.
(i) The area of the reservoir considered as proved includes: (A) The area identified by drilling and limited by fluid contacts, if any, and (B) Adjacent undrilled portions of the reservoir that can, with reasonable certainty, be judged to be continuous with it and to contain economically producible oil or gas on the basis of available geoscience and engineering data.
(ii) In the absence of data on fluid contacts, proved quantities in a reservoir are limited by the lowest known hydrocarbons ("LKH") as seen in a well penetration unless geoscience, engineering or performance data and reliable technology establishes a lower contact with reasonable certainty.


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(iii) Where direct observation from well penetrations has defined a highest known oil ("HKO") elevation and the potential exists for an associated gas cap, proved oil reserves may be assigned in the structurally higher portions of the reservoir only if geoscience, engineering or performance data and reliable technology establish the higher contact with reasonable certainty.
(iv) Reserves which can be produced economically through application of improved recovery techniques (including, but not limited to, fluid injection) are included in the proved classification when: (A) Successful testing by a pilot project in an area of the reservoir with properties no more favorable than in the reservoir as a whole, the operation of an installed program in the reservoir or an analogous reservoir, or other evidence using reliable technology establishes the reasonable certainty of the engineering analysis on which the project or program was based; and (B) The project has been approved for development by all necessary parties and entities, including governmental entities.
(v) Existing economic conditions include prices and costs at which economic producibility from a reservoir is to be determined. The price shall be the average during the 12-month period prior to the ending date of the period covered by the report, determined as an unweighted arithmetic average of the first-day-of-the-month price for each month within such period, unless prices are defined by contractual arrangements, excluding escalations based upon future conditions.
"Proved undeveloped reserves"means reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for recompletion.
(i) Reserves on undrilled acreage shall be limited to those directly offsetting development spacing areas that are reasonably certain of production when drilled, unless evidence using reliable technology exists that establishes reasonable certainty of economic producibility at greater distances.
(ii) Undrilled locations can be classified as having proved undeveloped reserves only if a development plan has been adopted indicating that they are scheduled to be drilled within five years, unless the specific circumstances, justify a longer time.
(iii) Under no circumstances shall estimates for proved undeveloped reserves be attributable to any acreage for which an application of fluid injection or other improved recovery technique is contemplated, unless such techniques have been proved effective by actual projects in the same reservoir or an analogous reservoir, or by other evidence using reliable technology establishing reasonable certainty.
"SEC" means the United States Securities and Exchange Commission.
"Standardized Measure"means the after-tax present value of estimated future net cash flows of proved reserves, determined in accordance with the rules and regulations of the SEC, using prices and costs employed in the determination of proved reserves and a ten percent discount rate.
"U.S." means United States.
"WTI" means West Texas intermediate,Intermediate, a light sweet blend of oil produced from fields in western Texas.
Texas and is a grade of oil used as a benchmark in oil pricing.
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.
All currency amounts are expressed in U.S. dollars.

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CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS
This Annual Report on Form 10-K (this "Report") contains forward-looking statements that involve risks and uncertainties. When used in this document, the words "believes," "plans," "expects," "anticipates," "forecasts," "intends," "continue," "may," "will," "could," "should," "future," "potential," "estimate," or the negative of such terms and similar expressions as they relate to the Company are intended to identify forward-looking statements, which are generally not historical in nature. 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 as and when made, they involve risks and uncertainties that are difficult to predict and, in many cases, beyond the Company's control. In addition, the Company may be subject to currently unforeseen risks that may have a materially adverse effect on it.
These risks and uncertainties include, among other things, volatility of commodity prices; product supply and demand; the impact of a widespread outbreak of an illness, such as the COVID-19 pandemic, on global and U.S. economic activity; competition; the ability to obtain environmental and other permits and the timing thereof; the effect of future regulatory or legislative actions on Pioneer or the industries in which it operates, including the risk of new restrictions with respect to development activities; the ability to obtain approvals from third parties and negotiate agreements with third parties on mutually acceptable terms; potential liability resulting from pending or future litigation; the costs and results of drilling and operations; availability of equipment, services, resources and personnel required to perform the Company's drilling and operating activities; access to and availability of transportation, processing, fractionation, refining, storage and export facilities; Pioneer's ability to replace reserves, implement its business plans or complete its development activities as scheduled; the risk that the Company will not be able to successfully integrate the business of Parsley or fully or timely realize the expected synergies and accretion metrics from the Parsley acquisition; access to and cost of capital; the financial strength of counterparties to Pioneer's credit facility, investment instruments and derivative contracts and purchasers of Pioneer's oil, NGL and gas production; uncertainties about estimates of reserves, identification of drilling locations and the ability to add proved reserves in the future; the assumptions underlying forecasts, including forecasts of production, well costs, capital expenditures, rates of return, expenses, cashflow and cash flow from purchases and sales of oil and gas, net of firm transportation commitments; sources of funding; tax rates; quality of technical data; environmental and weather risks, including the possible impacts of climate change; cybersecurity risks; the risks associated with the ownership and operation of the Company's oilfield services businesses and acts of war or terrorism. In addition, the Company may be subject to currently unforeseen risks that may have a materially adverse effect on it.
Accordingly, no assurances can be given that the actual events and results will not be materially different fromthan the anticipated results described in the forward-looking statements. See "Item 1. Business — Competition, Markets and Regulations," "Item 1A. Risk Factors," "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" 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. Readers are cautioned not to place undue reliance on forward-looking statements, which speak only as of the date hereof. The Company undertakes no duty to publicly update these statements except as required by law.




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PART I
ITEM 1.BUSINESS
ITEM 1.BUSINESS
General
Pioneer is a large independent oil and gas exploration and production company that explores for, develops and produces oil, NGLs and gas within the United States.States, with operations in the Permian Basin in West Texas. The Company is a Delaware corporation, and its common stock has been listed and traded on the NYSE under the ticker symbol "PXD" since its formation in 1997.
The Company's principal executive office is located at 5205 N. O'Connor Blvd., Suite 200,777 Hidden Ridge, Irving, Texas, 75039.75038. The Company also maintains an office in Midland, Texas and field offices in its areasarea of operation.
At December 31, 2017, Pioneer had 3,836 employees, 1,423 of whom were employed in field and plant operations and 1,010 of whom were employed in vertical integration activities.
Available Information
Pioneer files or furnishes annual, quarterly and current reports, proxy statements and other documents with the SEC under the Securities Exchange Act of 1934 (the "Exchange Act"). The public may read and copy any materials that Pioneer files with the SEC at the SEC's Public Reference Room at 100 F Street, N.E., Washington, D.C. 20549. The public may obtain information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. Also, the SEC maintains an Interneta website (www.sec.gov) that contains reports, proxy and information statements, and other information regarding issuers, including Pioneer, that file electronically with the SEC. The public can obtain any documents that Pioneer files with the SEC at http://www.sec.gov.
The Company also makes available free of charge through its Internet website (www.pxd.com) its Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and, if applicable, amendments to those reports filed or furnished pursuant to Section 13(a) of the Exchange Act as soon as reasonably practicable after it electronically files such material with, or furnishes it to, the SEC. In addition to the reports filed or furnished with the SEC, Pioneer publicly discloses information from time to time in its press releases and investor presentations that are posted on its website and inor during publicly accessible investor conferences. Such information, including information posted on or connected to the Company's website, is not a part of, or incorporated by reference in, this Report or any other document the Company files with or furnishes to the SEC.
Mission and Strategies
The Company's mission is to be America's leading independent energy company, focused on value, safety, the environment, technology and our greatest asset, ourits people. The Company's long-term growth strategy is centered around the following strategic objectives:
maintaining a strong balance sheet to ensure financial flexibility;
delivering economic production and proved reserve growth;
enhancingadditions through drilling, completion and production activities by improvement activities;
utilizing the Company's scale and technology advancements to reduce costs and improve efficiency;
reinvesting 50 percent to 60 percent of Company's operating cash flow, with the remaining cash flow targeted to debt reduction and returning cash to shareholders, primarily through dividends;
evaluating accretive acquisitions or acreage trades that enhance the Company's reinvestment framework and allow incremental cash flow to be returned to shareholders;
developing and training employees and contractors to perform their jobs in a safe manner; and
stewarding the environment through industry leading sustainable development efforts.
The Company's long-term strategy is primarily anchored by the Company's interests in the long-lived Spraberry/Wolfcamp oil field located in the Permian Basin in West Texas, which has an estimated remaining productive life in excess of 4045 years. Underlying the Spraberry/Wolfcamp field is over 75 percent of the Company's total proved
Competition
The oil and gas industry is highly competitive in the exploration for and acquisition of reserves, asthe acquisition of December 31, 2017.
In February 2018, the Company announced plans to divest its oil and gas leases, marketing of oil, NGL and gas production, activitiesthe obtaining of equipment and services and the hiring and retention of staff necessary for the identification, evaluation, operation and acquisition and development of oil and exploration opportunitiesgas properties. The Company's competitors include a large number of companies, including major integrated oil and gas companies, other independent oil and gas companies, and individuals engaged in the following areas:exploration for and development of oil and gas properties. The Company also faces competition from companies that supply alternative sources of energy, such as wind, solar power, and other renewables. Competition will increase as alternative energy technology becomes more reliable and governments throughout the world support or mandate the use of such alternative energy.
the Eagle Ford Shale gas and liquids field located in South Texas;

the Raton gas field located in southern Colorado;
the West Panhandle gas and liquids field located in the Texas Panhandle;
the Edwards gas field located in South Texas; and
the Sinor Nest Wilcox oil field located in South Texas.
No assurance can be given that the sales will be completed in accordance with the Company's plans or on terms and at prices acceptable to the Company.

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Business Activities
Pioneer's purposeCompetitive advantage is to competitively and profitably explore for, develop and producegained in the oil and gas reserves. In so doing, the Company sells homogeneous oil, NGL and gas units that, except for geographic and relatively minor quality differences, cannot be significantly differentiated from units offered for sale by the Company's competitors. The Company's portfolio of resources and opportunities are primarily located in the Spraberry/Wolfcamp oil field, and provide long-lived, dependable production and lower-risk exploration and development opportunities.industry by employing well-trained and experienced personnel who make prudent capital investment decisions based on management direction, embrace technological innovation and are focused on price and cost management. The Company has a team of dedicated employees who represent the professional disciplines and sciences that the Company believes are necessary to allow Pioneer to maximize the long-term profitability and net asset value inherent in its physical assets.
Petroleum industry.See "Item 1A. Risk Factors - The petroleum industry has been operating in a lower oil price environment since late 2014, when North American oil prices began declining due to a worldwide oversupply of oil. During the fourth quarter of 2016, the Organization of Petroleum Exporting Countries ("OPEC") membersCompany faces significant competition and some nonmembers, led by Russia, pledged to reduce their oil output by roughly 1.8 million barrels a day from October 2016 levelsof its competitors have resources in an effort to draw down a global oversupplyexcess of the Company's available resources" for additional information.
Impact of the COVID-19 Pandemic
A novel strain of the coronavirus ("COVID-19") surfaced in late 2019 and to rebalance supply and demand. The agreement became effective in January 2017 and was originally set to expire in March 2018. During November 2017, OPEC members and some nonmembers agreed to lengthen the output reductions through December 2018. These output reductions represented an unprecedented level of cooperation among oil-producing countries and, coupled with healthy oil demand, resulted in an increase in oil prices during 2017. In 2018, the worldwide demand for oil is expected to increase further as economic growthhas spread around the world, is forecastedincluding to be stronger than the last several years. This demand increase is expected to be met by higher supplies of oil from U.S. shale production growth and further oil inventory drawdowns. The Company expects ongoing oil price volatility as compliance with the output reduction agreement, changes in oil inventories and actual demand growth is reported.
The growth of unconventional shale drilling in the United States has substantially increasedStates. In March 2020, the supply of gasWorld Health Organization declared COVID-19 a pandemic, and NGLs, resulting in a significant decline in related prices as the supply of these products has grown. While the industry has invested in initiatives designed to increase takeaway capacity, such as the construction of liquefied natural gas ("LNG") and NGL export facilities, the supply of these products has exceeded the overall United States and international demand for these commodities. NGL products and gas supplies are expected to increase during 2018, which is expected to cause prices to decline slightly or remain flat during 2018.
Significant factors that are likely to affect 2018 commodity prices include: the effect of new policies enacted by the President of the United States declared the COVID-19 outbreak a national emergency. The COVID-19 pandemic has significantly affected the global economy, disrupted global supply chains and his administration; fiscal challenges facing the United States federal government; enacted changes to the tax lawscreated significant volatility in the United States; expected economic growthfinancial markets. In addition, the COVID-19 pandemic has resulted in travel restrictions, business closures and other restrictions that have disrupted the demand for oil throughout the world; politicalworld and when combined with pressures on the global supply-demand balance for oil and related products, resulted in significant volatility in oil prices beginning in late February 2020. The length of this demand disruption is unknown, and will ultimately depend on various factors beyond the Company's control, such as the duration and scope of the pandemic, the length and severity of the worldwide economic developments in North Africa anddownturn, the Middle East; forecasted increased demand from Asian and European markets; the extent to which membersability of OPEC, Russia and other oil exportingproducing nations adhere to manage the global oil supply, additional actions by businesses and agreegovernments in response to extend the agreedpandemic, the speed and effectiveness of responses to combat the virus, including the effectiveness of the COVID-19 vaccines, and the time necessary to balance oil production cuts, which expire in December 2018; the supply and demand fundamentals for NGLs indemand. Additionally, there is significant uncertainty regarding the United States and the pace at which export capacity grows; and overall North American gas supply and demand fundamentals, including incremental LNG export capacity additions and the pace that gas storage is refilled during the year given that gas storage levels are anticipated to be at normal levels at the endlasting impacts of the winter draw season.
Pioneer uses commodity derivative contractspandemic on global demand, as it cannot be predicted as to whether certain demand-reducing behaviors such as declines in business travel and changes in work-from-home practices will persist beyond the resolution of the pandemic. In response to these developments the Company has implemented measures to mitigate the effectimpact of commoditythe COVID-19 pandemic on its employees, operations and financial position. These measures include, but are not limited to, the following:
Employee Health and Safety. The Company has taken steps to keep its employees safe in light of the COVID-19 pandemic by implementing preventative measures and developing response plans intended to minimize unnecessary risk of exposure and infection among its employees, as recommended by the Centers for Disease Control and Prevention (the "CDC"). The Company has also modified certain business practices (including those related to non-operational employee work locations, such as a significant reduction in business travel and physical participation in meetings, events and conferences) to conform to government restrictions and best practices encouraged by the CDC, and other governmental and regulatory authorities.
Expense Management. With the reduction in revenue associated with lower oil prices during 2020, the Company focused its efforts on:
Optimizing drilling, completion and operational efficiencies, resulting in lower well costs and operating costs and
Reducing general and administrative and other overhead related costs through:
a corporate restructuring to reduce the Company's staffing levels to correspond with a planned reduction in future activity levels, resulting in approximately 300 employees being involuntarily separated from the Company in October 2020 (the "2020 Corporate Restructuring");
voluntary salary reductions by the Company's officers and board of directors from March 2020 through December 2020;
reductions in 2020 cash incentive compensation;
2020 benefit reductions; and
other cash cost reductions.
Balance Sheet, Cash Flow and Liquidity. During 2020, the Company also took the following actions to strengthen its financial position and increase liquidity during the COVID-19 pandemic:
Reduced its 2020 capital budget by over 50 percent,
Enhanced its liquidity position by refinancing a portion of its existing debt and issuing new debt, with the combined objective of increasing liquidity, extending the Company's debt maturities and lowering the Company's future cash interest expense on long-term debt, and
Adjusted the Company's derivative positions to reduce the effects of oil price volatility on the Company'sits net cash provided by operating activities and its net asset value. activities.
The Company has entered into commodity derivative contracts for a large portioncontinues to assess the global impacts of the COVID-19 pandemic and may modify its forecasted production for 2018plans as the health and economic impacts of COVID-19 continue to a lesser extent, its forecasted 2019 production; however, commodity prices are volatileevolve.

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See Note 5 and if commodity prices decline, the Company could realize lower prices for unprotected volumes and could see a reduction in the prices at which the Company is able to enter into derivative contracts on additional volumes in the future. As a result, the Company's internal cash flows will be negatively impacted by a reduction in commodity prices. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" and Note E7 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's open derivative positions as of December 31, 2017, and subsequent changes to these positions.additional information.
Liquidity. In spite of the lower commodity price environment, the Company has maintained a strong liquidity position. The Company's primary needs for cash are for capital expenditures, acquisitions of oil and gas properties, vertical integration assets and facilities, payments of contractual obligations, including debt maturities, dividends, share repurchases and working capital obligations. Principal sources of liquidity include cash and cash equivalents, net cash provided by operating activities, short-term and long-term investments, proceeds from divestitures and proceeds from financing activities (principally borrowings under the Company's credit facility or issuances of debt or equity securities). If internal cash flows do not meet the Company's expectations, the Company may reduce its level of capital expenditures, and/or fund a portion of its capital expenditures (i) by using cash on hand, (ii) through sales of short-term and long-term investments, (iii) with borrowings under the Company's credit facility, (iv) through issuances of debt or equity securities or (v) through other sources, such as sales of nonstrategic assets.
Production. The Company focuses its efforts towards maximizing its average daily production of oil, NGLs and gas through development drilling, production enhancement activities and acquisitions of producing properties, while minimizing controllableAcquisition Activities

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costs associated with production activities. For the year ended December 31, 2017, the Company's production of 99 MMBOE, excluding field fuel usage, represented a 16 percent increase compared to production during 2016. Production, price and cost information with respect to the Company's properties for 2017, 2016 and 2015 is set forth in "Item 2. Properties — Selected Oil and Gas Information — Production, price and cost data."
Acquisition activities.The Company regularly seeks to acquire propertiesor trade acreage that complementcomplements its operations, provideprovides exploration and development opportunities, increases the lateral length of future horizontal wells and potentially provideprovides superior returns on investment. The Company periodically evaluates and pursues acquisition opportunitiesinvestment (including opportunities to acquire particular oil and gas assets or entities owning oil and gas assets and opportunities to engage in mergers, consolidations or other business combinations with such entities). The Company periodically evaluates and pursues acquisition and acreage trade opportunities and at any given time may be in various stages of evaluating such opportunities. Such stages may take the form of internal financial analyses, oil and gas reserve analyses, due diligence, the submission of indications of interest, preliminary negotiations, negotiations of letters of intent or negotiations of definitive agreements. The success of any acquisition or acreage trade is uncertain and depends on a number of factors, some of which are outside the Company's control. See "Item 1A. Risk Factors — The Company may be unable to make attractive acquisitions and any acquisition it completes is subject to substantial risks that could materially and adversely affect its business."
During 2017, 2016 and 2015,On January 12, 2021, the Company spent $136 million, $446 millionacquired Parsley Energy, Inc., a Delaware corporation that previously traded on the NYSE under the symbol "PE" ("Parsley"), pursuant to the Agreement and $36 million, respectively, primarily to purchase undeveloped acreage for future exploitationPlan of Merger, dated as of October 20, 2020, among Pioneer, certain of its subsidiaries, Parsley and exploration activities inParsley's subsidiary, Parsley Energy, LLC (the "Parsley Acquisition"). Although this Annual Report is being filed following the Spraberry/Wolfcamp fieldcompletion of the Permian Basin.Parsley Acquisition, unless otherwise specifically noted, information set forth herein only relates to the period as of and for the fiscal year ended December 31, 2020 and therefore does not include information relating to Parsley or its subsidiaries as of and for such periods. Accordingly, unless otherwise specifically noted, references herein to "Pioneer" or the "Company" refer only to Pioneer and its subsidiaries prior to the Parsley Acquisition and do not include Parsley or its subsidiaries.
2016 Permian Basin acquisition. The Company's 2016 acquisition activities includedParsley Acquisition will be accounted for as a business combination, with the August 2016 acquisition of 28,000 net acres in the Permian Basin, with net production of approximately 1,400 BOEPD, from an unaffiliated third party for $428 million, including normal closing adjustments. The fair value of consideration allocated to the assets acquired included $347 million of unproved property, $79 million of proved property and $5 million of other property and equipment. Theacquisition date fair value of the asset retirement obligationsassets and other liabilities assumed were $2 million and $1 million, respectively.
Exploratory activities. The Company has devoted significant efforts and resources to hiring and developing a highly skilled geoscience, engineering and land staff as well as acquiring a significant portfolioacquired. Parsley's post-acquisition date results of lower-risk exploration opportunities that are expected tooperations will be evaluated and tested over the next decade and beyond. Exploratory and extension drilling involve greater risks of dry holes or failure to find commercial quantities of hydrocarbons than development drilling or enhanced recovery activities. See "Item 1A. Risk Factors - Exploration and development drilling may not result in commercially productive reserves."
Development activities. The Company seeks to increase its proved oil and gas reserves, production and cash flow through development drilling and by conducting other production enhancement activities, such as well recompletions. During the three years ended December 31, 2017, the Company drilled 181 gross (130 net) development wells, with 100 percent of the wells being successfully completed as productive wells, at a total drilling cost (net toconsolidated into the Company's interest) of $2.0 billion.
The Company believes that its current property base provides a substantial inventory of prospects for future reserve, production and cash flow growth. The Company's proved reserves as of December 31, 2017 include proved undeveloped reserves and proved developed non-producing reserves of 45 MMBbls of oil, 22 MMBbls of NGLs and 291 Bcf of gas. The timing of the development of these proved reserves will be dependent upon commodity prices, drilling and operating costs and the Company's expected operating cash flows andinterim consolidated financial condition.
Integrated services. The Company continues to utilize its integrated services to control well costs and operating costs in addition to supporting the execution of its drilling and production activities. The Company owns fracture stimulation fleets totaling approximately 470,000 horsepower that support its drilling operations. The Company also owns other field service equipment that support its drilling and production operations, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. In addition, Pioneer Sands LLC, the Company's wholly-owned sand mining subsidiary, is supplying high-quality brown sand for proppant, which is being used by the Company to fracture stimulate horizontal wells in the Spraberry and Wolfcamp Shale intervals.
The Company is also constructing a field-wide water distribution system to reduce the cost of water for drilling and completion activities and to secure adequate supplies of water to support the Company's long-term growth plan for the Spraberry/Wolfcamp field. During 2017, the Company expanded its mainline system, subsystems and frac ponds to efficiently deliver water to Pioneer's drilling locations. The Company is purchasing up to 120 thousand barrels per day of effluent water from the City of Odessa and has signed an agreement with the City of Midland to upgrade the city's wastewater treatment plant in return for a dedicated long-term supply of water from the plant. Once the upgrade to the wastewater treatment plant is complete, the Company expects to receive approximately two billion barrels of low-cost, non-potable water over a 28-year contract period (up to 240 thousand barrels per day) to support its completion operations.

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Asset divestitures. The Company regularly reviews its asset base for the purpose of identifying nonstrategic assets, the disposition of which would increase capital resources available for other activities, create organizational and operational efficiencies and further the Company's objective of maintaining a strong balance sheet to ensure financial flexibility. In February 2018, the Company announced its intention to divest its properties in South Texas, Raton and the West Panhandle field and focus its efforts and capital resources to its Permian Basin assets. No assurance can be given that the sales will be completed in accordance with the Company's plans orstatements beginning on terms and at prices acceptable to the Company.
Permian Basin. In April 2017, the Company completed the sale of approximately 20,500 acres in the Martin County region of the Permian Basin, with net production of approximately 1,500 BOEPD, to an unaffiliated third party for cash proceeds of $264 million. The sale resulted in a gain of $194 million. In conjunction with the divestiture, the Company reduced the carrying value of goodwill by $2 million, reflecting the portion of the Company's goodwill related to the assets sold.
EFS Midstream. In July 2015, the Company completed the sale of its 50.1 percent equity interest in EFS Midstream LLC ("EFS Midstream") to an unaffiliated third party, with the Company receiving total consideration of $1.0 billion, of which $530 million was received at closing and the remaining $501 million was received in July 2016. The Company recorded a net gain on the disposition of $777 million in September 2015.
The Company will continue to review its acreage in the Permian Basin and negotiate with other operators in the area to sell or trade nonstrategic properties to achieve operating efficiencies and to improve profitability.January 12, 2021. See Notes C and DNote 19 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for specific information regarding the Company's asset divestitures and impairments. Also see "Item 1A. Risk Factors - The Company's ability to complete dispositions of assets, or interests in assets, may be subject to factors beyond its control, and in certain cases the Company may be required to retain liabilities for certain matters" for a discussion of risks associated with planned divestitures.additional information.
Marketing of Production
General. Production from the Company's properties is marketed using methods that are consistent with industry practices. Sales prices for oil, NGL and gas production are negotiated based on factors normally considered in the industry, such as an index or spot price, price regulations, distance from the well to thea major pipeline, commodity quality and prevailing supply and demand conditions. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" for additional discussion regarding price risk.information.
Seasonal nature of business. Generally, but not always, the demand for gas decreases during the summer months and increases during the winter months. Seasonal anomalies such as mild winters or hot summers may impact general seasonal changes in demand.
Significant purchasers. During 2017, the Company's significant purchasersDelivery commitments. The Company has committed certain volumes of oil, NGLs and gas were Occidental Energy Marketing Inc. (24 percent), Sunoco Logistics Partners L.P. (14 percent) and Plains Marketing LP (10 percent). The loss of a significant purchaser or an inability to secure adequate pipeline, gas plant and NGL fractionation infrastructure in its key producing areas could have a material adverse effect on the Company's ability to sell its oil, NGL and gas production.to customers under a variety of contracts, some of which have volumetric firm transportation or fractionation requirements that could require monetary shortfall penalties if the Company's transported or fractionation volumes are insufficient to satisfy associated commitments. See "Item 1A. Risk Factors - The Company may not be able to obtain access on commercially reasonable terms or otherwise to pipelines and storage facilities, gathering systems and other transportation, processing, fractionation, refining and export facilities to market its oil, NGL and gas production; the Company relies on a limited number of purchasers for a majority of its products" and Note L11 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information aboutadditional information.
Significant purchasers. During 2020 the Company's oil, NGL and gas sales to Sunoco Logistics Partners L.P., Occidental Energy Marketing Inc. and Plains Marketing L.P accounted for 36 percent, 18 percent and 14 percent of the Company's oil and gas revenues, respectively. The loss of one of these significant purchasers or an inability to secure adequate pipeline, gas plant and NGL fractionation infrastructure capacity risksfor its Permian Basin production could have a material adverse effect on the Company's ability to produce and sell its oil, NGL and gas production.
Revenues from sales of purchased oil and gas to Occidental Energy Marketing Inc. accounted for 28 percent of the Company's sales of purchased oil and gas. No other sales customer exceeded ten percent of the Company's sales of purchased oil and gas during 2020. The loss of the Company's significant customers.
Derivative risk management activities. The Company primarily utilizes commodity swap contracts, collar contractspurchaser of purchased oil and collar contracts with short puts that are intendedgas would not be expected to (i) reduce thehave a material adverse effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. The Company also, from time to time, utilizes interest rate derivative contracts intended to reduce the effect of interest rate volatility on the Company's indebtedness and marketing derivativesability to mitigate price risk associated with buy and sell marketing arrangements to fulfill firm pipeline transportation commitments. The Company accounts for its derivative contracts using the mark-to-market ("MTM") method of accounting. commodities it purchases from third parties.
See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" for a description of the Company's derivative risk management activities, "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" and Note E13 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information aboutadditional information.

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Human Capital
At December 31, 2020, the impactCompany had 1,853 employees, 698 of commodity derivative activities on oil, NGLwhom were employed in field operations and gas revenues256 of whom were employed in vertical integration activities. The Company understands that employee recruiting, retention and net derivative gains and losses during 2017, 2016 and 2015, as well asdevelopment play a critical role to the Company's open commodity derivative positions at December 31, 2017,business activities and subsequent changesits ability to achieve its long-term strategy. The Company offers a competitive compensation and benefits program and has established policies and talent development programs with the goal of creating an inclusive environment to allow all employees to feel respected, valued and connected to the business.
Compensation and benefits program. The Company annually reviews compensation for all employees to adjust compensation for market conditions and attract and retain a highly skilled workforce. The Company considers its employees to be its greatest asset and encourages them to take full advantage of the benefits and programs the Company offers. To ensure Pioneer attracts and retains top talent, the Company maintains an above-average benefits package. Pioneer's employees participate in incentive plans that take into consideration individual and Company performance through a traditional bonus plan that is influenced by individual performance and a variable compensation plan denominated in Company stock. In addition to cash and equity compensation, the Company also offers other employee benefits such as life and health (medical, dental & vision) insurance, paid time off, paid parental leave, flexible work schedules and a 401(k) plan.
Diversity and inclusion. The Company is committed to creating an inclusive environment where all employees feel respected, valued and connected to the business — a workplace to which individuals bring their "authentic" selves and can be successful in achieving their goals. The Company has established a variety of diversity and inclusion initiatives, such as OnePioneer, a single organization that was created in 2019 through the merger of Pioneer's various employee resource groups. OnePioneer is led by a diverse representation of the Company's employees who advance diversity and inclusion across the entire company.
Talent development.The Company's talent planning approach identifies and targets development for critical talent. The Company identifies critical roles based on several factors, including strategic importance, scope and impact, and unique skills. Successor candidates for those positions.critical roles are then identified as those who have the interest, ability and experience to succeed in the critical role within five years. Talent planning enables Pioneer to proactively approach succession planning and offer targeted development for high potential employees and successors, while enabling a cross-functional view of talent to increase visibility and mobility.
Community involvement. Pioneer's dedication to community well-being and success shows in the many ways the Company seeks to be a good neighbor in all of its operating areas. The Company's employees continually seek out events, organizations, initiatives and partnerships to support, and the Company is honored to support their ongoing efforts to enrich the communities where they live and work, including through a charitable matching program.
Competition, MarketsHealth, safety and Regulationsenvironment. The Company maintains a culture of continuous improvement in safety and environmental practices, supports a diverse workforce and inspires teamwork to drive innovation, with oversight from the Health, Safety and Environment Committee and the Nominating and Corporate Governance Committee of the board of directors.
Competition.
Regulation
The oil and gas industry is highly competitive inextensively regulated at the exploration forfederal, state, and acquisition of reserves, the acquisition of oil and gas leases and the hiring and retention of staff necessary for the identification, evaluation and acquisition and development of such properties. The Company's competitors include a large number of companies, including major integrated oil and gas companies, other independent oil and gas companies, and individuals engaged in the exploration for and development of oil and gas properties. Somelocal levels. Regulations affecting elements of the Company's competitorsenergy sector are substantially largerunder constant review for amendment or expansion over time and frequently more stringent requirements are imposed. Various federal and state agencies, including the Texas Railroad Commission, the Bureau of Land Management (the "BLM"), the U.S. Environmental Protection Agency (the "EPA"), the U.S. Occupational Safety and Health Administration ("OSHA"), have financiallegal and other resources greater than those of the Company; as such, the Company may be at a competitive disadvantage in the identification, acquisitionregulatory authority and development of properties that complementoversight over the Company's operations.
Competitive advantage is gained in the oil and gas exploration and development industryactivities and operations. Other agencies with certain authority over the Company's business include the Internal Revenue Service (the "IRS"), the SEC and NYSE. Ensuring compliance with the rules, regulations and orders promulgated by employing well-trainedsuch entities requires extensive effort and experienced personnel who make prudent capital investment decisions based on management direction, embrace technological innovationincremental costs to comply, which consequently affects the Company's profitability. Because public policy changes are commonplace, and existing laws and regulations are focused on price and cost management. The Company has a team of dedicated employees who represent the professional disciplines and sciences thatfrequently amended, the Company believes are necessaryis unable to allow Pioneer to maximizepredict the long-term profitability and net asset value inherent in its physical assets.
Markets. The Company's ability to produce and market oil, NGLs and gas profitably depends on numerous factors beyondfuture cost or impact of compliance. However, the Company's control. The effectCompany does not expect that any of these factors cannot be accurately predicted or anticipated. Althoughlaws and regulations will affect its operations materially differently than they would affect other companies with similar operations, size and financial strength.
The following are significant areas of government control and regulation affecting the Company cannot predict the occurrence of events that may affect commodity prices or the degree to which commodity prices will be affected, the prices for any commodity that the Company produces will generally approximate current market prices in the geographic region of the production.Company:
Securities regulations. Enterprises that sell securities in public markets are subject to regulatory oversight by agencies such as the SEC and the NYSE. This regulatory oversight imposes on the Company many requirements, including the

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responsibility for establishing and maintaining disclosure controls and procedures andalongside internal controls over financial reporting, and ensuring that the financial statements and other information included in submissions to the SEC do not contain any untrue statement of a

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material fact or omit to state a material fact necessary to make the statements made in such submissions not misleading. Failure to comply with the rules and regulations of the SEC could subject the Company to litigation from public or private plaintiffs. Failure to comply with the rules of the NYSE could result in the de-listingdelisting of the Company's common stock, which would have an adverse effect on the market price and liquidity of the Company's common stock. Compliance with some of these rules and regulations is costly, and regulations are subject to change or reinterpretation.
Environmental and occupational health and safety matters. The Company'sCompany strives to conduct its operations are subjectin a socially and environmentally responsible manner and is required to stringentcomply with many federal, state and local laws, regulations and executive orders concerning occupational safety and health, the discharge or other release of materials and protection of the environment and natural resources. These environmental legal requirements primarily relate to:
the discharge or other release of pollutants into federal and state waters;
assessing the environmental impact of seismic acquisition, drilling or construction activities;
the generation, storage, transportation and disposal of waste materials, including hazardous substances;
the emission of certain gases, including GHGs, into the atmosphere;
the monitoring, abandonment, reclamation and remediation of well and other sites, including sites of former operations;
the development of emergency response and spill contingency plans;
the protection of threatened and endangered species; and
worker protection.

The more significant of these existing environmental and occupational health and safety laws and regulations include the following U.S. legal standards, as amended from time to time:
the Clean Air Act ("CAA"), which restricts the emission of air pollutants from many sources and imposes various pre construction, operational, monitoring and reporting requirements, and that the EPA has relied upon as authority for adopting climate change regulatory initiatives relating to GHG emissions;
the Federal Water Pollution Control Act, also known as the Clean Water Act ("CWA"), which regulates discharges of pollutants from facilities to state and federal waters and establishes the extent to which waterways are subject to federal jurisdiction and rulemaking as protected waters of the United States;
the Comprehensive Environmental Response, Compensation and Liability Act of 1980 ("CERCLA"), which imposes liability on generators, transporters, disposers and arrangers of hazardous substances at sites where hazardous substance releases have occurred or are threatening to occur;
the Resource Conservation and Recovery Act ("RCRA"), which governs the generation, treatment, storage, transport and disposal of solid wastes, including oil and gas exploration and production wastes and hazardous wastes;
the Safe Drinking Water Act ("SDWA"), which ensures the quality of the nation's public drinking water through adoption of drinking water standards and controlling the injection of waste fluids into below-ground formations that may adversely affect drinking water sources;
OSHA, which establishes workplace standards for the protection of the health and safety of employees, including the implementation of hazard communications programs designed to inform employees about hazardous substances in the workplace, potential harmful effects of these substances, and appropriate control measures; and
the Endangered Species Act ("ESA"), which restricts activities that may affect federally identified endangered and threatened species or their habitats through the implementation of operating restrictions or a temporary, seasonal or permanent ban in affected areas.
Additionally, there exist tribal, state and local jurisdictions where the Company operates that also have, or are developing or considering developing, similar environmental and occupational health and safety laws and regulations governing worker health and safety,many of these same types of activities. Failure by the discharge of materials into the environment and environmental protection. Numerous governmental entities, including the U.S. Environmental Protection Agency (the "EPA"), the U.S. Occupational Safety and Health Administration (the "OSHA") and analogous state agencies, have the power to enforce compliance with these laws and regulations and the permits issued under them, which may cause the Company to incur significant capital expenditures or take costly actions to achieve and maintain compliance. Failure to comply with these laws, regulations and regulationsregulatory initiatives or controls may result in the assessment of sanctions, including administrative, civil and criminal penalties,penalties; the imposition of investigatory, remedial orand corrective action obligations or the incurrence of obligations,capital expenditures; the occurrence of restrictions, delays or restrictionscancellations in the permitting, development or the performanceexpansion of projectsprojects; and the issuance of orders enjoining the Company from conducting certain operationsinjunctions restricting or prohibiting some or all of our activities in a particular area. WhileHistorically, the Company's environmental and worker safety compliance costs have historically not had a material adverse effect on its results of operations,operations. However, there can be no assurance that such costs will not be material in the future or that new or more stringently applied laws and regulationssuch future compliance will not materially increase the cost of doing business.
The following is a summary of the more significant environmental and worker health and safety laws, as amended from time to time, to which the Company's business operations are or may be subject and with which compliance or the failure to maintain compliance may have a material adverse effect on the Company's capital expenditures, results of operations or financial position.business and operational results.
Hazardous wastes and substances. The federal Resource Conservation and Recovery Act ("RCRA") and comparable state statutes regulate the generation, transportation, treatment, storage, disposal and cleanup of hazardous and non-hazardous wastes. Under the authority delegated by the EPA, the individual states administer some or all of the provisions of RCRA, sometimes in conjunction with their own, more stringent requirements. The Company generates some amounts of ordinary industrial wastesowns, leases or operates numerous properties that may be regulated as RCRA hazardous wastes. RCRA currently excludes drilling fluids, produced waters and certain other wastes associated with the exploration, development and production of oil or gas from the definition of hazardous waste. These wastes are instead regulated under RCRA's less stringent non-hazardous waste provisions. There have been efforts from time to time to remove this exclusion, which removal could have a material adverse effect on the Company's results of operations and financial position, and it is possible that certainused for oil and gas exploration and production wastes now classified as non-hazardous could be classified as hazardous waste in the future. For example, in response to a lawsuit filed by several non-governmental environmental groups against the EPAactivities for the agency's failure to timely assess its RCRA Subtitle D criteria regulations for oil and gas wastes, the EPA and the environmental groups entered into a settlement agreement that was finalized in a consent decree issued by the U.S. District Court for the District of Columbia in December 2016, whereby the EPA is required to propose no later than March 15, 2019, a rulemaking for the revision ofmany years. The Company also has acquired certain Subtitle D criteria regulations pertaining to oil and gas wastes or sign a determination that revision of the regulations is not necessary. If the EPA proposes a rulemaking for revised oil and gas waste regulations, the decree requires that the EPA take final action following notice and comment rulemaking no later than July 15, 2021.
The federal Comprehensive Environmental Response, Compensation and Liability Act ("CERCLA"), also known as the Superfund law, and analogous state laws impose joint and several liability, without regard to fault or legality of conduct, on classes of persons who are considered to be responsible for the release of a "hazardous substance" into the environment. These persons include the current and past owner or operator of the site where the release occurred, and anyone who disposed or arranged for the disposal of a hazardous substance released at the site. Under CERCLA, such persons may be subject to joint and several liability for the costs of cleaning up the hazardous substances that have been released into the environment, for damages to natural resources and for the costs of certain health studies. CERCLA also authorizes the EPA and, in some instances,properties from third parties to act in response to threats to the public health or the environment and to seek to recover from the responsible classes of persons the costs they incur. It is not uncommon for neighboring landowners and other third-parties to file claims for personal injury and property damage allegedly caused by the hazardous substances released into the environment. The Company generates materials in the course of its operations that may be regulated as CERCLA hazardous substances.
See "Item 1A. Risk Factors - The nature of the Company's assets and production operations may impact the environment or cause environmental contamination, which could result in material liabilities to the Company" for further discussion on environmental contamination issues.
Water use, surface discharges and discharges into belowground formations. The Federal Water Pollution Control Act, also known as the Clean Water Act (the "CWA"), and analogous state laws impose restrictions and strict controlswhose actions with respect to the


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dischargerespect to the management and disposal or release of pollutants, including spills and leaks of oil andhydrocarbons, hazardous substances into waters of the United States and state waters. Spill prevention, control and countermeasure plan requirements imposedor wastes at or from such properties were not under the CWA require appropriate containment bermsCompany's control prior to acquiring them. Under certain environmental laws and similar structures to help prevent the contamination of navigable waters in the event of a petroleum hydrocarbon spill, rupture or leak. Additionally, the CWA and analogous state laws require individual permits or coverage under general permits for discharges of stormwater runoff from certain types of facilities. The CWA also prohibits the discharge of dredge and fill material into regulated waters, including wetlands, unless authorized by an appropriately issued permit. Federal and state regulatory agencies can impose administrative, civil and criminal penalties, as well as require remedial or mitigation measures, for noncompliance with discharge permits or other requirements of the CWA and analogous state laws.
The federal Oil Pollution Act ("OPA") sets minimum standards for prevention, containment and cleanup of oil spills into waters of the United States. Under OPA, responsible parties, including owners and operators of onshore facilities,regulations such as explorationCERCLA and production facilities, may be held strictly liable for oil spill cleanup costs and natural resource damages as well as a variety of public and private damages that may result from oil spills. OPA amends the CWA and thus noncompliance with OPA could result in civil and criminal penalties under the CWA.
In June 2015, the EPA and the U.S. Army Corps of Engineers (the "Corps") published a final rule attempting to clarify the federal jurisdictional reach over waters of the United States, but legal challenges to this rule followed and the rule was stayed nationwide by the U.S. Sixth Circuit Court of Appeals in October 2015 pending resolution of the court challenges. In January 2017, the U.S. Supreme Court accepted review of the rule to determine whether jurisdiction rests with the federal district or appellate courts. Additionally, following the issuance of a presidential executive order to review the rule, the EPA and the Corps proposed a rulemaking in June 2017 to repeal the June 2015 rule. The EPA and the Corps also announced their intent to issue a new rule defining the CWA's jurisdiction. On November 22, 2017, the EPA and the Corps published a proposed rule specifying that the contested June 2015 rule would not take effect until two years after the rule proposed on November 22, 2017 is finalized and published in the federal register. As a result, future implementation of the June 2015 rule is uncertain at this time. To the extent this rule or a revised rule expands the scope of the CWA's jurisdiction,RCRA, the Company could face increased costsincur strict joint and delays with respectseveral liability due to obtaining permitsdamages to natural resources or for dredge and fill activities in wetland areas in connection with any expansion activities.
The Company may disposeremediating hydrocarbons, hazardous substances or wastes disposed of produced water from oil and gas activities in underground wells, which are designed and permitted to placeor released by prior owners or operators. Moreover, an accidental release of materials into the water into non-productive geologic formations that are isolated from fresh water sources. The Underground Injection Control ("UIC") program established under the federal Safe Drinking Water Act ("SDWA") requires issuance of permits from the EPA or an analogous state agency for the construction and operation of disposal wells. Additionally, the UIC program establishes minimum standards for disposal well operations and restricts the types and quantities of fluids that may be disposed. Because some states have become concerned that the disposal of produced water into below ground formations could contribute to seismicity, they have adopted or are considering adopting additional regulations governing such disposal. Should future onerous regulations or bans relating to underground wells be placed in effect in areas where the Company has significant operations, there could be an adverse impact onenvironment during the Company's ability to operate. See "Item 1A. Risk Factors - Pioneer's operations are substantially dependent on the availability of water and its ability to dispose of produced water gathered from drilling and production activities and restrictions on the Company's ability to obtain water or dispose of produced water may have a materially adverse effect on its financial condition, results of operations and cash flows" for further discussion on seismicity issues.
Hydraulic fracturing. Hydraulic fracturing is an important and common practice to stimulate production of oil and gas from dense subsurface rock formations. The process involves the injection of water, sand and additives under pressure into targeted subsurface formations to fracture the surrounding rock and stimulate oil and gas production. The Company routinely conducts hydraulic fracturing in its drilling and completion programs. The process is typically regulated by state oil and gas commissions, but, in recent years, several federal, state and local agencies have asserted regulatory authority over certain aspects of the process. Additionally, from time to time, the U.S. Congress has considered legislation that would provide for federal regulation of hydraulic fracturing and disclosure of chemicals used in the fracturing process but, to date, no such federal legislation has been adopted. The Company participates in FracFocus, a national publicly accessible internet-based registry managed by the Ground Water Protection Council and the Interstate Oil and Gas Compact Commission. FracFocus provides the public access to Company-reported information on the additives it uses in the hydraulic fracturing process on wells the Company operates. In the event federal, state or local restrictions are adopted in areas where the Company is currently conducting operations, or in the future plans to conduct operations, the Company may incur additional costs to comply with such requirements that may be significant in nature, experience delays or curtailment in the pursuit of exploration, development or production activities, and be limited or precluded in the drilling of wells or the volume that the Company is ultimately able to produce from its reserves.
See "Item 1A. Risk Factors - Federal, state and local legislative and regulatory initiatives relating to hydraulic fracturing, as well as governmental reviews of such activities, could result in increased costs and additional operating restrictions or delays and materially and adversely affect the Company's production" for further discussion on hydraulic fracturing issues.

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Air emissions. The federal Clean Air Act (the "CAA") and comparable state laws regulate emissions of various air pollutants through air emissions permitting programs and the imposition of other compliance requirements. Such laws and regulations could require a facility to obtain pre-approval for construction or modification projects expected to produce air emissions or result in the increase of existing air emissions. Additionally, these legal requirements could impose stringent air permit conditions or utilize specific emission control technologies to limit emissions of certain air pollutants. Federal and state regulatory agencies can also impose administrative, civil and criminal penalties for noncompliance with air permits or other requirements of the CAA and associated state laws and regulations. See "Item 1A. Risk Factors - The Company's operations are subject to stringent environmental and oil and gas-related laws and regulations that could cause it to suspend or curtail its operations or expose it to material costs and liabilities" for further discussion on air emission issues.
Climate change. Climate change continues to attract considerable public, political and scientific attention. As a result, numerous proposals have been made, and are likely to continue to be made, at the international, national, regional and state levels of government to monitor and limit emissions of greenhouse gases ("GHGs"). These efforts have included consideration of cap-and-trade programs, carbon taxes, GHG reporting and tracking programs, and regulations that directly limit GHG emissions from certain sources. The adoption and implementation of any international, federal or state legislation or regulations that require reporting of GHGs or otherwise restrict emissions of GHGs from the Company's equipment and operations could require the Company to incur increased operating costs, such as costs to purchase and operate emissions control systems, acquire emissions allowances or comply with new regulatory or reporting requirements. See "Item 1A. Risk Factors - Climate change legislation and regulatory initiatives restricting emissions of GHGs could result in increased operating costs and reduced demand for the oil, NGLs and gas the Company produces, and the potential physical effects of climate change could disrupt the Company's production and cause it to incur significant costs and liabilities. The Company also could incur costs related to the clean-up of third-party sites to which it sent regulated substances for disposal or to which it sent equipment for cleaning and for damages to natural resources or other claims related to releases of regulated substances at or from such third-party sites.

Over time, the trend in preparing for or respondingenvironmental and occupational health and safety laws and regulations is to those effects" for further discussiontypically place more restrictions and limitations on climate change issues.
Endangered species. The federal Endangered Species Act (the "ESA") and analogous state laws regulate activities that could have an adverse effect on species listed as threatenedmay adversely affect the environment or endangered underexpose workers to injury. If existing legal requirements change or new legislative, regulatory or executive initiatives are developed and implemented in the ESA. Some of the Company's operations are conducted in areas where protected species or their habitats are known to exist. In these areas,future, the Company may be obligatedrequired to developmake significant, unanticipated capital and implement plans to avoid potential adverse effects to protected species and their habitats, and theoperating expenditures. The Company may not have insurance or be prohibited from conducting operations in certain locations or during certain seasons, such as breedingfully covered by insurance against all environmental and nesting seasons, when the Company's operations could have an adverse effect on the species. It is also possible that a federal or state agency could order a complete halt to drilling activities in certain locations if it is determined that such activities may have a serious adverse effect on a protected species. See "Item 1A. Risk Factors - Laws and regulations pertaining to threatened and endangered species could delay or restrict the Company's operations and cause it to incur substantial costs" for further discussion on endangered species issues.
Activities on federal lands. Oil and gas exploration, development and production activities on federal lands are subject to the National Environmental Policy Act ("NEPA"). NEPA requires federal agencies, including the federal Bureau of Land Management (the "BLM"), to evaluate major agency actions having the potential to significantly impact the environment. In the course of such evaluations, an agency will prepare an Environmental Assessment that assesses the potential direct, indirect and cumulative impacts of a proposed project and, if necessary, will prepare a more detailed Environmental Impact Statement that may be made available for public review and comment. Currently, the Company has minimal exploration and production activities on federal lands.However, for those current activities, as well as for future or proposed exploration and development plans on federal lands, governmental permits or authorizations that are subject to the requirements of NEPA are required. This process has the potential to delay or limit, or increase the cost of, the development of some of the Company's oil and gas projects. Authorizations under NEPA are also subject to protest, appeal or litigation, any or all of which may delay or halt projects. Moreover, depending on the mitigation strategies recommended in the Environmental Assessments, the Company could incur added costs, which could be substantial.
Occupational health and safety. The Company's operations are subject to the requirements of the federal Occupational Safety and Health Act and comparable state statutes. These laws and the related regulations issued by OSHA strictly govern the protection of theoccupational health and safety of employees. The OSHA hazard communication standard, the EPA community right-to-know regulations under Title III of CERCLArisks. For more information on environmental and similar state statutes require that the Company organize or disclose information about hazardous materials used or produced in the Company's operations.
Additionally, the Company's sand mining operations are subject to mining safety regulation. The U.S. Mining Safety and Health Administration ("MSHA") is the primary regulatory organization that regulates quarries, surface mines, underground mines and the industrial mineral processing facilities associated with and located at quarries and mines. The Company's sand mining operations are subject to the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006, which imposes stringentoccupational health and safety standards on numerous aspects of mineral extractionmatters, see the risk factors identified as Health, Safety and processing operations, including the training of personnel, operating procedures, operating equipment and other matters.Environmental Risks in Item 1A. Risk Factors.


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OSHA promulgated new rules in March 2016 for workplace exposure to respirable silica for several other industries. Respirable silica is a known health hazard for workers exposed over long periods. The MSHA has been considering the adoption of similar rules. If any new rule issued by MSHA lowers the workplace exposure limit significantly, the Company could incur significant capital and operating expenditures for equipment to reduce this exposure.
Other regulation of the oil and gas industry. The Company's oil and gas industry is regulated by numerous federal, stateoperations are subject to laws and local authorities. Legislation affecting regulations that relate to matters including:
the acquisition of seismic data;
location, drilling and casing of wells;
hydraulic fracturing;
well production operations;
disposal of produced water;
regulation of transportation and sale of oil, NGLs and gas;
surface usage;
calculation and disbursement of royalty payments and production taxes;
restoration of properties used for oil and gas industry is under constant review for amendment or expansion, frequently increasing the regulatory burden. Also, numerous federaloperations; and state departments and agencies are authorized by statute to issue rules and regulations that are binding on the oil and gas industry and its individual members, some of which carry substantial penalties for failure to comply. Although the regulatory burden on the oil and gas industry may increase the Company's cost of doing business by increasing the cost of production, the Company believes that these burdens generally do not affect the Company any differently or to any greater or lesser extent than they affect other companies in the industry with similar types, quantities and locations
transportation of production.
Development and production.Development and production operations are subject to various types of regulation at the federal, state and local levels. These types of regulation includeregulations including requiring permits for the drilling of wells, the posting of bonds in connection with various types of activities and filing reports concerning operations. Most states,Texas, and some counties and municipalities in which the Company operates, also regulate one or more of the following:
the location of wells;
the method of drilling and casing wells;
the method and ability to fracture stimulate wells;
the surface use and restoration of properties upon which wells are drilled;
the plugging and abandoning of wells; and
notice to surface owners and other third parties.
State laws regulate the size and shape of drilling and spacing units or proration units governing the poolingdrilling and production of oil and gas properties. Some states allow forced pooling or integration of tracts to facilitate development while other states relyThe Company relies on voluntary pooling, production sharing agreements and the drilling of lands andallocation wells to develop its leases. In some instances, forced pooling or unitization may be implemented by third parties and may reduce the Company's interest in the unitized properties. In addition, state conservation laws establish maximum rates of production from oil and gas wells and generally prohibit the venting or flaring of gas and impose requirements regarding production rates.without a permit. These laws and regulations may limit the amount of oil and gas the Company can produce from the Company's wells, negatively affect the economic decision to continue to produce these wells or limit the number of wells or the locations that the Company can economically drill. Moreover, each state generally imposes a production or severance tax with respect to
Approximately one percent of the production and sale of oil, NGLs and gas within its jurisdiction. States do not regulate wellhead prices or engage in other similar direct regulation, but there can be no assurance that they will not do so in the future. The effect of such future regulations may limit the amounts ofCompany's U.S. oil and gas that may be produced fromleases are granted or approved by the federal government and administered by the BLM. All of the Company's wells, negatively affect the economicsfederal leases are outside of production from these wells or limit the number of locationsTexas and the Company can drill.
Regulation of transportationhas no current plans to further develop the leases at this time. Such leases require compliance with detailed federal regulations and sale of gas. The availability, terms and cost of transportation significantly affect sales of gas. Federal and state regulations govern the price and terms for access to gas pipeline transportation. Intrastate gas pipeline transportation activities are subject to various state laws and regulations, as well as orders of state regulatory bodies. The interstate transportation and sale of gas is subject to federal regulation, including regulation of the terms, conditions and rates for interstate transportation, storage and variousthat regulate, among other matters, primarilydrilling and operations on lands covered by the Federal Energy Regulatory Commission ("FERC"). FERC endeavors to make gas transportation more accessible to gas buyersthese leases and sellers on an open-accesscalculation and non-discriminatory basis.
Pursuantdisbursement of royalty payments to the Energy Policy Act of 2005 ("EPAct 2005") it is unlawful for any entity, suchfederal government.
See the risk factors identified as the Company, to use any deceptive or manipulative device or contrivanceRegulatory Risks and Health, Safety and Environmental Risks in connection with the purchase or sale of gas or transportation services subject to regulation by FERC, in contravention of rules prescribed by FERC. The EPAct 2005 also gives FERC authority to impose civil penalties of up to $1 million per day for each violation of the Natural Gas Act ("NGA"), the Natural Gas Policy Act of 1978 and related regulations.
Under FERC Order 704, which regulates annual gas transaction reporting requirements, any market participant, including a producer such as the Company, that engages in wholesale sales or purchases of gas that equal or exceed 2.2 million MMBtus of physical gas in the previous calendar year must annually report such sales and purchases to FERC on Form No. 552 by May 1 of the year following the calendar year when such sales and purchases occurred. Form No. 552 contains aggregate volumes of wholesale gas purchased or sold in the prior calendar year to the extent such transactions utilize, contribute to or may contribute to the formation of price indices. Order 704 is intended to increase the transparency of the wholesale gas markets and to assist FERC in monitoring those markets and in detecting market manipulation.
Intrastate gas pipeline transportation rates are subject to regulation by state regulatory commissions. The basis for intrastate gas pipeline regulation, and the degree of regulatory oversight and scrutiny given to intrastate gas pipeline rates, vary from state

Item 1A. Risk Factors.
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ITEM 1A.RISK FACTORS
to state. Additional proposals and proceedings that might affect the gas industry are considered from time to time by the U.S. Congress, FERC, state legislatures, state regulatory bodies and the courts. The Company cannot predict when or if any such proposals might become effective or their effect, if any, on its operations. The Company believes that the regulation of intrastate gas pipeline transportation rates will not affect its operations in any way that is materially different from the effects on its similarly situated competitors.
Natural gas processing. The Company's gas processing operations are generally not subject to FERC or state regulation with respect to rates or terms and conditions of service. There can be no assurance that the Company's processing operations will continue to be unregulated in the future. However, although the processing facilities may not be directly regulated, other laws and regulations may affect the availability of gas for processing, such as state regulation of production rates and maximum daily production allowable from gas wells, which could impact the Company's processing business.
Gas gathering. Section 1(b) of the NGA exempts gas gathering facilities from FERC jurisdiction. The Company believes that its gathering facilities meet the traditional tests FERC has used to establish a pipeline system's status as a non-jurisdictional gatherer. There is, however, no bright-line test for determining the jurisdictional status of pipeline facilities. Moreover, the distinction between FERC-regulated transmission services and federally unregulated gathering services is the subject of litigation from time to time, so the classification and regulation of some of the Company's gathering facilities may be subject to change based on future determinations by the FERC and the courts. Thus, the Company cannot guarantee that the jurisdictional status of its gas gathering facilities will remain unchanged.
While the Company owns or operates some gas gathering facilities, the Company also depends on gathering facilities owned and operated by third parties to gather production from its properties, and therefore the Company is affected by the rates charged by these third parties for gathering services. To the extent that changes in federal or state regulation affect the rates charged for gathering services, the Company also may be affected by these changes. The Company does not anticipate that the Company would be affected any differently than similarly situated gas producers.
Regulation of transportation and sale of oil and NGLs. Intrastate liquids pipeline transportation rates, terms and conditionsfinancial results are subject to regulation by numerous federal, state and local authorities and, in a number of instances, the ability to transport and sell such products on interstate pipelines is dependent on pipelines that are also subject to FERC jurisdiction under the Interstate Commerce Act (the "ICA"). The Company does not believe these regulations affect it any differently than other producers.
The ICA requires that pipelines maintain a tariff on file with the FERC. The tariff sets forth the established rates as well as the rules and regulations governing the service. The ICA requires, among other things, that rates and terms and conditions of service on interstate common carrier pipelines be "just and reasonable." Such pipelines must also provide jurisdictional service in a manner that is not unduly discriminatory or unduly preferential. Shippers have the power to challenge new and existing rates and terms and conditions of service before the FERC.
Rates of interstate liquids pipelines are currently regulated by the FERC, primarily through an annual indexing methodology, under which pipelines increase or decrease their rates in accordance with an index adjustment specified by the FERC. For the five-year period beginning in July 2016, the FERC established an annual index adjustment equal to the change in the producer price index for finished goods plus 1.23 percent. This adjustment is subject to review every five years. Under the FERC's regulations, a liquids pipeline can request a rate increase that exceeds the rate obtained through application of the indexing methodology by using a cost-of-service approach, but only after the pipeline establishes that a substantial divergence exists between the actual costs experienced by the pipeline and the rates resulting from application of the indexing methodology. Increases in liquids transportation rates may result in lower revenue and cash flows for the Company.
In addition, due to common carrier regulatory obligations of liquids pipelines, capacity must be prorated among shippers in an equitable manner in the event there are nominations in excess of capacity by current shippers or capacity requests are received from a new shipper. Therefore, new shippers or increased volume by existing shippers may reduce the capacity available to the Company. Any prolonged interruption in the operation or curtailment of available capacity of the pipelines that the Company relies upon for liquids transportation could have a material adverse effect on its business, financial condition, results of operations and cash flows. However, the Company believes that access to liquids pipeline transportation services generally will be available to it to the same extent as to its similarly situated competitors.
In November 2009, the Federal Trade Commission (the "FTC") issued regulations pursuant to the Energy Independence and Security Act of 2007 intended to prohibit market manipulation in the petroleum industry. Violators of the regulations face civil penalties of up to $1 million per violation per day, subject to annual inflation adjustment. The Commodity Futures Trading Commission (the "CFTC") has also issued anti-manipulation rules that subject violators to a civil penalty of up to the greater of $1 million per violation, subject to annual inflation adjustment, or triple the monetary gain to the person for each violation. See "Items 1A. Risk Factors - The Company's transportation of gas, sales and purchases of oil, NGLs, gas or other energy commodities, and any derivative activities related to such energy commodities, expose the Company to potential regulatory risks."

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Energy commodity prices. Sales prices of oil, condensate, NGLs and gas are not currently regulated and sales are made at market prices. Although prices of these energy commodities are currently unregulated, the U.S. Congress historically has been active in their regulation. The Company cannot predict whether new legislation to regulate oil and gas might actually be enacted by the U.S. Congress or the various state legislatures, and what effect, if any, the proposals might have on the Company's operations.
Transportation of hazardous materials. The federal Department of Transportation has adopted regulations requiring that certain entities transporting designated hazardous materials develop plans to address security risks related to the transportation of hazardous materials. The Company does not believe that these requirements will have an adverse effect on the Company or its operations. The Company cannot provide any assurance that the security plans required under these regulations would protect against all security risks and prevent an attack or other incident relateduncertainties, including but not limited to the Company's transportation of hazardous materials.
ITEM 1A.RISK FACTORS
The nature of the business activities conducted by the Company subjects it to certain hazards and risks. The following is a summary of some of the material risks relating to the Company's business activities.those described below. Other risks are described in "Item 1. Business — Competition, Markets and Regulations," "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Item 7A. Quantitative and Qualitative Disclosures About Market Risk." These risks are not the only risks facing the Company. The Company's business could also be affected by additional risks and uncertainties not currently known to the Company or that it currently deems to be immaterial. If any of these risks actually occurs, it could materially harm the Company's business, financial condition or results of operations or impair the Company's ability to implement business plans or complete development activities as scheduled. In that case, the market price of the Company's common stock could decline. The following risk factors are summarized as general business and industry, operational, financial, health, safety and environmental, regulatory risks and risks associated with the Parsley Acquisition.

General Business and Industry Risks
The COVID-19 pandemic and recent developments in the global oil markets have had, and may continue to have, material adverse consequences for general economic, business and industry conditions.
Declining general economic, business or industry conditions could have a material adverse effect on the Company's results of operations.
The Company may be unable to make attractive acquisitions and any acquisition it completes is subject to substantial risks that could materially and adversely affect its business.
The Company's ability to complete dispositions of assets, or interests in assets, may be subject to factors beyond its control, and in certain cases the Company may be required to retain liabilities for certain matters.
The Company's operations and drilling activity are concentrated in the Permian Basin of West Texas; such concentration makes the Company vulnerable to risks associated with operating in a limited geographic area.
The Company may not be able to obtain access on commercially reasonable terms or otherwise to pipelines and storage facilities, gathering systems and other transportation, processing, fractionation, refining and export facilities to market its oil, NGL and gas production.
The refining industry may be unable to absorb U.S. oil production; in such a case, the resulting surplus could depress prices and restrict the availability of markets.
Estimates of proved reserves and future net cash flows are not precise. The actual quantities and net cash flows of the Company's proved reserves may prove to be lower than estimated.
Because the Company's producing wells decline continually over time, the Company will need to mitigate these declines through drilling and production enhancement initiatives and/or acquisitions.
A portion of the Company's total estimated proved reserves at December 31, 2020 were undeveloped, and those proved reserves may not ultimately be developed.
The Company faces significant competition and some of its competitors have resources in excess of the Company's available resources.
The Company's business could be materially and adversely affected by security threats, including cybersecurity threats, and other disruptions.
Provisions of the Company's charter documents and Delaware law may inhibit a takeover, which could limit the price investors might be willing to pay in the future for the Company's common stock.
The Company has identified a material weakness in its internal control over financial reporting that, if not remediated, could result in additional material misstatements in its consolidated financial statements.
Operational Risks
The Company's operations involve many operational risks, some of which could result in unforeseen interruptions to the Company's operations and substantial losses to the Company for which the Company may not be adequately insured.
Exploration and development drilling involve substantial costs and risks and may not result in commercially productive reserves.
Part of the Company's strategy involves using some of the latest available horizontal drilling and completion techniques, which involve risks and uncertainties in their application.
The Company's expectations for future drilling activities will be realized over several years, making them susceptible to uncertainties that could materially alter the occurrence or timing of such activities.
Multi-well pad drilling may result in volatility in the Company's operating results.
The Company's operations are substantially dependent upon the availability of water and its ability to dispose of produced water gathered from drilling and production activities.
The Company's use of seismic data is subject to interpretation and may not accurately identify the presence of oil and gas, which could materially and adversely affect the results of its drilling operations.

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The Company's gas processing, gathering and treating operations are subject to operational and regulatory risks.
Financial Risks
The prices of oil, NGL and gas are highly volatile.
Future declines in the price of oil, NGLs, and gas could result in a reduction in the carrying value of the Company's proved oil and gas properties.
The Company's actual production could differ materially from its forecasts.
The Company could experience periods of higher costs if commodity prices rise.
The Company is a party to debt instruments, a credit facility and other financial commitments that may limit the Company's ability to fund future business and financing activities.
The Company's ability to declare and pay dividends and repurchase shares is subject to certain considerations.
A failure by purchasers of the Company's production to satisfy their obligations to the Company could have a material adverse effect on the Company's results of operations.
The failure by counterparties to the Company's derivative risk management activities to perform their obligations could have a material adverse effect on the Company's results of operations.
The Company's derivative risk management activities could result in financial losses, limit the Company’s potential gains or fail to protect the Company from declines in commodity prices.
Pioneer's ability to utilize its historic U.S. net operating loss carryforwards and those of Parsley may be limited.
The Company periodically evaluates its unproved oil and gas properties to determine recoverability of its cost and could be required to recognize noncash charges in the earnings of future periods.
The Company periodically evaluates its goodwill for impairment and could be required to recognize noncash charges in the earnings of future periods.
Health, Safety and Environmental Risks
The Company's operations are subject to a series of risks arising out of the threat of climate change.
The nature of the Company's assets and production operations may impact the environment or cause environmental contamination.
The Company's hydraulic fracturing and former sand mining operations may result in silica-related health issues and litigation.
Increasing attention to ESG matters may impact the Company’s business.
Regulatory Risks
The Company's operations are subject to stringent environmental, oil and gas-related and occupational safety and health legal requirements.
Laws, regulations and other executive actions or regulatory initiatives regarding hydraulic fracturing could increase the Company's cost of doing business and result in additional operating restrictions, delays or cancellations that could have a material adverse effect on the Company's business, results of operations and financial condition.
Laws and regulations pertaining to protection of threatened and endangered species or to critical habitat, wetlands and natural resources could delay, restrict or prohibit the Company's operations and cause it to incur substantial costs.
The Company's transportation of gas, sales and purchases of oil, NGLs and gas or other energy commodities, and any derivative activities related to such energy commodities, expose the Company to potential regulatory risks.
The enactment of derivatives legislation could have a material adverse effect on the Company's ability to use derivative instruments to reduce the effect of commodity price, interest rate and other risks.
The Company's bylaws provide that the Court of Chancery of the State of Delaware (or if the Court of Chancery does not have jurisdiction, the federal district court for the District of Delaware) will be the exclusive forum for certain legal actions between the Company and its stockholders and that the federal district courts of the United States shall be the sole and exclusive forum for the resolution of causes of action arising under the Securities Act of 1933.
Risks associated with the Parsley Acquisition
The financial and operational synergies attributable to the Parsley Acquisition may vary from expectations.
Litigation relating to the Parsley Acquisition could result in substantial costs to the Company.
The Company may be unable to integrate the business of Parsley successfully and/or realize the anticipated benefits of the Parsley Acquisition.
The Company's future results will suffer if it does not effectively manage its expanded operations.


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General business and industry risks.
The COVID-19 pandemic and recent developments in the global oil markets have had, and may continue to have, material adverse consequences for general economic, business and industry conditions and for the Company's operations, financial condition, results of operations, cash flows and liquidity and those of its purchasers, suppliers and other counterparties.
The COVID-19 pandemic has significantly affected the global economy, disrupted global supply chains and created significant volatility in the financial markets. In addition, the pandemic has resulted in travel restrictions, business closures and other restrictions that have led to a significant reduction in demand for oil, NGL and gas, which, when combined with the oil supply increase attributable to the battle for market share among OPEC, Russia and other oil producing nations that occurred during the first quarter of 2020, resulted in oil prices declining significantly beginning in late February 2020. For instance, on April 20, 2020, WTI crude oil future prices for May reached a record low of negative $37.63 per barrel. As a result of the pandemic and low oil prices, the Company reduced its 2020 drilling, completion, facilities and water infrastructure capital budget significantly in an effort to fund its budget fully from its forecasted cash flow. While prices for oil, NGLs and gas have generally improved during the fourth quarter of 2020 and the first quarter of 2021, if the reduced demand for and prices of oil, NGLs and gas, are highly volatileor the oversupply of oil, were to continue for a prolonged period, the Company may have to make changes to its operations and have declined significantly in recent years. A sustained decline in these commodity prices couldcapital budgets, and the Company's operations, financial condition, results of operations, cash flows and liquidity may be materially and adversely affectaffected. Risks include, but are not limited to, the Company's business, financial condition and results of operations.following:
The Company's revenues, profitability, cash flow and future rate of growth are highly dependent on commodity prices. Commodity prices may fluctuate widely in response to relatively minor changes in the supply of and demand for oil, NGLs and gas, market uncertainty and a variety of additional factors that are beyond the Company's control, such as:
domestic and worldwide supply of and demand for oil, NGLs and gas;
the price and quantity of foreign imports of oil, NGLs and gas;
worldwide oil, NGL and gas inventory levels, including at Cushing, Oklahoma, the benchmark location for WTI oil prices, and the U.S. Gulf Coast, where the majority of the U.S. refinery capacity exists;
volatility and trading patterns in the commodity-futures markets;
the capacity of U.S. and international refiners to utilize U.S. supplies of oil and condensate;
weather conditions;
overall domestic and global political and economic conditions;
actions of OPEC, its members and other state-controlled oil companies relating to oil price and production controls;
the effect of oil, NGL and LNG imports to and exports from the U.S.;
technological advances affecting energy consumption and energy supply;
domestic and foreign governmental regulations, including environmental regulations, and taxation;
the effect of energy conservation efforts;
shareholder activism or activities by non-governmental organizations to restrict the exploration, development and production of oil and gas so as to minimize emissions of carbon dioxide and methane GHGs;
the proximity, capacity, cost and availability of pipelines and other transportation facilities; and
the price, availability and acceptance of alternative fuels.
In the past, commodity prices have been extremely volatile, and the Company expects this volatility to continue. For the five years ended December 31, 2017, oil prices fluctuated from a high of $110.53 per Bbl in 2013 to a low of $26.21 per Bbl in 2016 while gas prices fluctuated from a high of $6.15 per Mcf in 2014 to a low of $1.64 per Mcf in 2016. Likewise, NGLs have suffered significant recent declines. NGLs are made up of ethane, propane, isobutene, normal butane and natural gasoline, all of which have different uses and different pricing characteristics. A further orAn extended decline in commodity prices could materially and adversely affect the Company's future business, financial condition, results of operations, liquidity or ability to finance planned capital expenditures. The Company makes price assumptions that are used for planning purposes, and a significant portion of the Company's cash outlays, including rent, salaries and noncancelable capital commitments, are largely fixed in nature. Accordingly, if commodity prices are below the expectations on which these commitments were based, the Company's financial results are likely to be adversely and disproportionately affected because these cash outlays are not variable in the short term and cannot be quickly reduced to respond to unanticipated decreases in commodity prices.

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Significant or extended price declines could also materially and adversely affect the amount of oil, NGLsNGL and gas that the Company can produce economically, which may result in (i) the Company having to make significant downward adjustments to its estimated proved reserves. A reduction in production could also result inreserves and (ii) a shortfall in expected cash flows, andwhich could require the Company to reduce capital spending or borrow funds to cover any such shortfall. AnyIn addition, the continuation of these factors could negativelydepressed prices may adversely affect the ability of the Company to pay dividends or repurchase shares of common stock in the future.
The reduced demand for oil, combined with the oversupply of oil, is expected to result in an oil surplus in the United States and worldwide. If the global demand for oil exports to foreign markets, or if the price that can be obtained in foreign markets does not support the transportation and other costs to reach those destinations, it may be uneconomical to invest in new wells and may cause the Company to shut in producing wells. The Company cannot be certain whether shut-in wells can successfully return to pre-shut-in production levels or that the costs required to return the wells to production will be economical.
The Company's ability to replacedevelop and sell its production could be materially and its future rateadversely affected by the inability or unwillingness of growth.
Thethird parties to provide sufficient processing, fractionation, refining, transportation, storage or export facilities to the Company. For example, oil storage in the United States has, at times, been near full capacity in many locations. If this were to occur for an extended period, the Company's derivative risk management activities could result in financial losses;purchasers might decline to purchase the Company's oil, NGLs and gas, and the Company may not enter into derivative arrangements with respectbe able to future volumes if prices are unattractive.
To mitigate the effectstore its production. Such a lack of commodity price volatility onmarket for or storage capacity for the Company's net cash provided by operating activities and its net asset value, supportproducts could require that the Company's annual capital budgeting and expenditure plans and reduce commodity price risk associated with certain capital projects, the Company's strategy is to enter into derivative arrangements covering aCompany shut in some portion of its production. The amount of oil NGLin storage may also keep oil prices at low levels for an extended period, even after demand begins to rise.
Under Texas law, the Texas Railroad Commission is empowered to prorate oil production in the state based on market demand. If the Texas Railroad Commission finds that waste is taking place or is reasonably imminent, it is empowered to adopt a rule or order to correct, prevent, or lessen the waste. If the Texas Railroad Commission imposes proration in the future, or if any other similar laws or regulations are imposed, those restrictions would limit the amount of oil and gas production. These derivative arrangements are subject to MTM accounting treatment, and the changes in fair market valueCompany can produce.
It is possible that any delay, reduction or curtailment of the contracts are reportedCompany's development and producing operations, whether due to regulatory actions or actions by the Company in reaction to market conditions, could result in the Company's statementsloss of operations each quarter, which may result in significant noncash gainsacreage through lease expiration.
Market conditions resulting from the effects of the COVID-19 pandemic, low oil prices, or losses. These derivative contracts maya negative or recessionary economy could also exposeincrease the Company to risk of financial loss in certain circumstances, including when:
production is less thanthat the contracted derivative volumes;
the counterparty to the derivative contract defaults on its contract obligations; or
the derivative contracts limit the benefit the Company would otherwise receive from increases in commodity prices.
On the other hand, failure to protect against declines in commodity prices exposes the Company to reduced liquidity when prices decline. Although the Company has entered into commodity derivative contracts for a large portion of its forecasted production through 2018, the volumes of protected production for 2019 and future years is substantially less. A sustained lower commodity price environment would result in lower realized prices for unprotected volumes and reduce the prices at which the Company could enter into derivative contracts on future volumes. This could make such transactions unattractive, and, as a result, some or allpurchasers of the Company's production, volumes forecasted for 2019 and beyond may not be protected by derivative arrangements. In addition, the Company's derivatives arrangements may not achieve their intended strategic purposes.
Finally, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Dodd-Frank Act"), enacted in July 2010, established federal oversight and regulation of the over-the-counter derivatives market and entities, such as the Company, that participate in that market. Regulation by the CFTC and banking regulators may materially and adversely affect the cost and availability of derivatives, including by causing the Company's contract counterparties, which are generally financial institutions and other market participants, to curtail or cease their derivatives activities.
The failure bylenders under its credit agreements, counterparties to the Company'sits derivative risk management activities to perform their obligations could have a material adverse effect on the Company's results of operations.
The use of derivative risk management transactions involves the risk that the counterparties willinstruments, and service providers may be unable to meet the financial terms of such transactions. The Company is unable to predict changesfulfill their obligations in a counterparty's creditworthinesstimely manner, or ability to perform. Even if the Company accurately predicts sudden changes, the Company's ability to negate the risk may be limited depending upon market conditions and the contractual terms of the transactions. During periods of declining commodity prices, the Company's derivative receivable positions generally increase, which increases the Company's counterparty credit exposure.at all. If any of the Company's counterpartiessuch counterparty were to default on its obligations, under the Company's derivative arrangements, such a default could have a material adverse effect on the Company's results of operations, and could result in a larger percentage of the Company's future production being subject to commodity price changes and could increase the likelihood that the Company's derivative arrangements may not achieve their intended strategic purposes.operations.
Exploration and development drilling may not result in commercially productive reserves.
Drilling involves numerous risks, including the risk that no commercially productive oil or gas reservoirs will be encountered. The cost of drilling, completing and operating wells is often uncertain and drilling operations may be curtailed, delayed or canceled, or become costlier, as a result of a variety of factors, including:
unexpected drilling conditions;
unexpected pressure or irregularities in formations;
equipment failures or accidents;
construction delays;
fracture stimulation accidents or failures;
adverse weather conditions;
restricted access to land for drilling or laying pipelines;

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title defects;
lack of available gathering, transportation, processing, fractionation, storage, refining or export facilities;
lack of available capacity on interconnecting transmission pipelines;
access to, and the cost and availability of, the equipment, services, resources and personnel required to complete the Company's drilling, completion and operating activities; and
delays imposed by or resulting from compliance with environmental and other governmental or regulatory requirements.
The Company's future drilling activities may not be successful and, if unsuccessful, the Company's proved reserves and production would decline, which could have an adverse effect on the Company's future results of operations and financial condition. While all drilling, whether developmental, extension or exploratory, involves these risks, exploratory and extension drilling involves greater risks of dry holes or failure to find commercial quantities of hydrocarbons. The Company expects that it will continue to experience exploration and abandonment expense in 2018.
Future price declines could result in a reduction in the carrying value of the Company's proved oil and gas properties, which could materially and adversely affect the Company's results of operations.
Significant or extended price declines could result in the Company having to make downward adjustments to the carrying value of its proved oil and gas properties. The Company performs assessments of its proved and unproved oil and gas properties whenever events or circumstances indicate that the carrying values of those assets may not be recoverable. In order to perform these assessments, management uses various observable and unobservable inputs, including management's outlooks for (i) proved reserves and risk-adjusted probable and possible reserves, (ii) commodity prices, (iii) production costs, (iv) capital expenditures and (v) production. To the extent such tests indicate a reduction of the estimated useful life or estimated future cash flows of the Company's proved oil and gas properties, the carrying value may not be recoverable and therefore an impairment charge wouldcould be required to reduce the carrying value of theits proved oil and gas properties to their fair value. For example, during 2017 the Company recognized an impairment charge of $285 million attributable to its Raton field in southeast Colorado, and in 2016 the Company recognized an impairment charge of $32 million attributable to its West Panhandle field assets in the panhandle region of Texas, primarily due to declines in commodity prices and downward adjustments to the economically recoverable reserves attributable to each asset. The Company may incur impairment charges in the future, which could materially affect the Company's results of operations in the period incurred. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Results of Operations - Impairment of oil and gas properties and other long-lived assets" and Note D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for further information on the Company's impairment charges.
The Company periodically evaluates its unproved oil and gas properties to determine recoverability of its cost and could be required to recognize noncash charges in the earnings of future periods.
At December 31, 2017, the Company carried unproved oil and gas property costs of $558 million. GAAP requires periodic evaluation of these costs on a project-by-project basis. These evaluations are affected by the results of exploration activities, commodity price outlooks, planned future sales or expiration of all or a portion of the leases and the contracts and permits appurtenant to such projects. If the quantity of potential reserves determined by such evaluations is not sufficient to fully recover the cost invested in each project, the Company will recognize noncash charges in the earnings of future periods.
The Company periodically evaluates itsIn addition, goodwill for impairment and could be required to recognize noncash charges in the earnings of future periods.
At December 31, 2017, the Company had a carrying value for goodwill of $270 million. Goodwill is assessed for impairment annually during the third quarter and whenever factsit is likely that events or circumstances indicate that the carrying value of thea reporting unit exceeds its fair value.

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The Company's goodwilloperations may be impaired, whichadversely affected if significant portions of its workforce are unable to work effectively, including because of illness, quarantines, social distancing, government actions, or other restrictions in connection with the COVID-19 pandemic. The Company, as recommended by the CDC, has implemented workplace restrictions, including guidance for employees to work remotely for health and safety reasons, where possible. As some employees may require an estimate of the fair values of the reporting unit's assets and liabilities. Those assessmentshave been or may be affected by (i) additional reserve adjustments both positive and negative, (ii) results of drilling activities, (iii) management's outlook for commodity prices and costs and expenses, (iv) changes in the Company's market capitalization, (v) changes in the Company's weighted average cost of capital and (vi) changes in income taxes. If the fair value of the reporting unit's net assets is not sufficient to fully support the goodwill balance in the future be placed in workplaces where exposure to COVID-19 is possible, the Company may be subject to risk of liability should such employees allege that the Company failed to adequately mitigate the risk of exposure to COVID-19, to the extent obligated to do so. In addition, in order to facilitate remote working arrangements, some employees are accessing workspaces from their personal devices through cloud-based systems, which could increase cybersecurity risks to the Company and to its employees. There can be no assurance that the Company's operations will reducenot be curtailed or suspended or otherwise adversely affected due to such workforce issues.
The Company is not able to predict the carrying valueultimate long-term impact of goodwillthe COVID-19 pandemic on the Company's business, which will depend on numerous evolving factors and future developments that are beyond the Company's control, including the length of time that the pandemic continues, the speed and effectiveness of responses to combat the virus, the impact of the pandemic and its aftermath on the demand for oil, NGLs and gas, the impaired value,response of the overall economy and the financial markets as well as the effect of governmental actions taken in response to the COVID-19 pandemic.
Declining general economic, business or industry conditions could have a material adverse effect on the Company's results of operations.
The economies in the United States and certain countries in Europe and Asia have been growing, with resulting improvements in industrial demand and consumer confidence. However, other economies, such as those of certain South American nations, continue to face economic struggles or slowing economic growth. If these conditions worsen, combined with a corresponding noncash charge to earningsdecline in economic growth in other parts of the world, there could be a significant adverse effect on global financial markets and commodity prices. In addition, continued hostilities in the periodMiddle East, and the occurrence or threat of terrorist attacks in the United States or other countries could adversely affect the global economy. Global or national health concerns, including the outbreak of pandemic or contagious disease, such as the COVID-19 pandemic, may adversely affect the Company by (i) reducing demand for its oil, NGL and gas because of reduced global or national economic activity, (ii) impairing its supply chain (for example, by limiting manufacturing of materials used in operations), and (iii) affecting the health of its workforce, rendering employees unable to work or travel. If the economic climate in the United States or abroad were to deteriorate, demand for petroleum products could diminish or stagnate, which goodwill is determinedcould depress the prices at which the Company could sell its oil, NGLs and gas, affect the ability of the Company's vendors, suppliers and customers to be impaired.continue operations and ultimately decrease the Company's cash flows and profitability. In addition, reduced worldwide demand for debt and equity securities issued by oil and gas companies may make it more difficult for it to raise capital.
The Company may be unable to make attractive acquisitions and any acquisition it completes is subject to substantial risks that could materially and adversely affect its business.
Acquisitions of producing oil and gas properties, including acreage trades, have from time to time contributed to the Company's growth. Acquisition opportunities in the oil and gas industry are very competitive, which can increase the cost of, or cause the Company to refrain from, completing acquisitions. The success of any acquisition will depend on a number of factors and involves potential risks, including, among other things:

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the inability to accurately forecast future commodity prices and estimate accurately the costs to develop the acquired reserves, the recoverable volumes of the acquired reserves, rates of future production and future net cash flows attainable from the acquired reserves;
the assumption of unknown liabilities, including environmental liabilities, and losses or costs for which the Company is not indemnified or for which the indemnity the Company receives is inadequate;
the validity of assumptions about costs, including synergies;
the effect on the Company's liquidity or financial leverage of using available cash or debt to finance acquisitions;acquisitions or from the amount of debt assumed as part of the acquisition;
the diversion of management's attention from other business concerns; and
an inability to hire, train or retain qualified personnel to manage and operate the Company's growing business and assets.
All of these factors affect whether an acquisition will ultimately generate cash flows sufficient to provide a suitable return on investment. Even though the Company performs a review of the properties it seeks to acquire that it believes is consistent with industry practices, such reviews are often limited in scope. As a result, among other risks, the Company's initial estimates of reserves may be subject to revision following an acquisition, which may materially and adversely affect the desired

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benefits of the acquisition. See Risks Associated with the Parsley Acquisition included in "Item 1A. Risk Factor" for additional information.
The Company's ability to complete dispositions of assets, or interests in assets, may be subject to factors beyond its control, and in certain cases the Company may be required to retain liabilities for certain matters.
From time to time, the Company sells an interest in a strategic assetits oil and gas properties for the purpose of assisting or accelerating the asset's development. In addition, the Company regularly reviews its property base for the purpose of identifying nonstrategic assets, the disposition of which would increase capital resources available for other activities and create organizational and operational efficiencies. Various factors could materially affect the ability of the Company to dispose of such interests or nonstrategic assets or complete announced dispositions, including the receipt of approvals of governmental agencies or third parties and the availability of purchasers willing to acquire the interests or purchase the nonstrategic assets on terms and at prices acceptable to the Company.
Sellers typically retain certain liabilities or indemnify buyers for certain pre-closing matters, such as matters of litigation, environmental contingencies, royalty obligations and income taxes. The magnitude of any such retained liability or indemnification obligation may be difficult to quantify at the time of the transaction and ultimately may be material. Also, as is typical in divestiture transactions, third parties may be unwilling to release the Company from guarantees or other credit support provided prior to the sale of the divested assets. As a result, after a divestiture, the Company may remain secondarily liable for the obligations guaranteed or supported to the extent that the buyer of the assets fails to perform these obligations.
The Company's operations involve many operational risks, some of which could result in unforeseen interruptions to the Company's operations and substantial losses to the Company for which the Company may not be adequately insured.
The Company's operations, including well stimulation and completion activities, such as hydraulic fracturing, and water distribution and disposal activities, are subject to all the risks incident to the oil and gas development and production business, including:
blowouts, cratering, explosions and fires;
adverse weather effects;
environmental hazards, such as NGL and gas leaks, oil and produced water spills, pipeline and vessel ruptures, encountering naturally occurring radioactive materials ("NORM"), and unauthorized discharges of toxic chemicals, gases, brine, well stimulation and completion fluids or other pollutants onto the surface or into the subsurface environment;
high costs, shortages or delivery delays of equipment, labor or other services or water and sand for hydraulic fracturing;
facility or equipment malfunctions, failures or accidents;
title problems;
pipe or cement failures or casing collapses;
uncontrollable flows of oil or gas well fluids;
compliance with environmental and other governmental requirements;
lost or damaged oilfield workover and service tools;
surface access restrictions;
unusual or unexpected geological formations or pressure or irregularities in formations;
terrorism, vandalism and physical, electronic and cyber security breaches; and
natural disasters.
The Company's overall exposure to operational risks may increase as its drilling activity expands and as it increases internally-provided fracture stimulation, water distribution, water disposal and other services. Any of these risks could result in substantial

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losses to the Company due to injury or loss of life, damage to or destruction of wells, production facilities or other property, clean-up responsibilities, regulatory investigations and penalties and suspension of operations.
The Company is not fully insured against certain of the risks described above, either because such insurance is not available or because of the high premium costs and deductibles associated with obtaining such insurance. Additionally, the Company relies to a large extent on facilities owned and operated by third-parties, and damage to or destruction of those third-party facilities could affect the ability of the Company to produce, transport and sell its hydrocarbons.
The Company's gas processing operations are subject to operational risks, which could result in significant damages and the loss of revenue.
As of December 31, 2017, the Company owned interests in 10 gas processing plants and four treating facilities. The Company is the operator of one of the gas processing plants and all four of the treating facilities. Nine of the gas processing plants are operated by third parties and one of the treating facilities is not currently being used. There are significant risks associated with the operation of gas processing plants. Gas and NGLs are volatile and explosive and may include carcinogens. Damage to or improper operation of a gas processing plant or facility could result in an explosion or the discharge of toxic gases, which could result in significant damage claims in addition to interrupting a revenue source.
Part of the Company's strategy involves using some of the latest available horizontal drilling and completion techniques, which involve risks and uncertainties in their application.
The Company's operations involve utilizing some of the latest drilling and completion techniques as developed by it and its service providers. Risks that the Company faces while drilling horizontal wells include, but are not limited to, the following:
landing the wellboreconcentrated in the desired drilling zone;
staying in the desired drilling zone while drilling horizontally through the formation;
running casing the entire lengthPermian Basin of the wellbore; and
being able to run tools and other equipment consistently through the horizontal wellbore.
Risks that the Company faces while completing wells include, but are not limited to, the following:
theWest Texas, an area of high industry activity, which may affect its ability to fracture stimulateobtain the planned number of stages;
the ability to run tools the entire length of the wellbore during completion operations; and
the ability to successfully clean out the wellbore after completion of the final fracture stimulation stage.
Drilling in emerging areas is more uncertain than drilling in areas that are more developed and have a longer history of established drilling operations. New discoveries and emerging formations have limited or no production history and, consequently, the Company is more limited in assessing future drilling results in these areas. If the Company's drilling results are worse than anticipated, the return on investment for a particular project may not be as attractive as anticipated and the Company may recognize noncash charges to reduce the carrying value of its unproved properties in those areas.
The Company's expectations for future drilling activities will be realized over several years, making them susceptible to uncertainties that could materially alter the occurrence or timing of such activities.
The Company has identified drilling locations and prospects for future drilling opportunities, including development, exploratory and infill drilling activities. These drilling locations and prospects represent a significant part of the Company's future drilling plans. For example, the Company's proved reserves as of December 31, 2017 include proved undeveloped reserves and proved developed non-producing reserves of 45 MMBbls of oil, 22 MMBbls of NGLs and 291 Bcf of gas. The Company's ability to drill and develop these locations depends on a number of factors, including the availability and cost of capital, regulatory approvals, negotiation of agreements with third parties, commodity prices, costs, access to and availability ofpersonnel, equipment, services, resources and personnel and drilling results. There can be no assurance thatfacilities access needed to complete its development activities as planned or result in increased costs; such concentration also makes the Company will drill these locationsvulnerable to risks associated with operating in a limited geographic area.
The Company's producing properties are geographically concentrated in the Permian Basin of West Texas. Industry activity is high in the Permian Basin and demand for and costs of personnel, equipment, power, services and resources remains high. Any delay or thatinability to secure the Company will be able to producepersonnel, equipment, power, services and resources could result in oil, orNGL and gas reserves from these locations or any other potential drilling locations. Well results vary by formation and geographic area, andproduction volumes being below the Company's drilling activities are generally focusedforecasted volumes. In addition, any such negative effect on remaining locations that are believed to offer the highest return. Changesproduction volumes, or significant increases in the laws or regulations on which the Company relies in planning and executing its drilling programs could materially and adversely impact the Company's ability to successfully complete those programs. For example, under current Texas laws and regulations the Company may receive permits to drill, and may drill and complete, certain horizontal wells that traverse one or more units and/or leases; a change in those laws or regulations could materially and adversely impact the Company's ability to drill those wells. Because of these uncertainties, the Company cannot 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 activities may materially differ from the Company's current

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expectations, whichcosts, could have a material adverse effect on the Company's proved reserves, financial condition and results of operations.operations, cash flow and profitability.
A portionAs a result of the Company's total estimated proved reserves at December 31, 2017 were undeveloped, and those proved reserves may not ultimately be developed.
At December 31, 2017, approximately eight percent of the Company's total estimated proved reserves were undeveloped. Recovery of undeveloped proved reserves requires significant capital expenditures and successful drilling. The Company's reserve data assumes that the Company can and will make these expenditures and conduct these operations successfully, which assumptions may not prove correct. If the Company chooses not to spend the capital to develop these proved undeveloped reserves, or if the Company is not otherwise able to successfully develop these proved undeveloped reserves, the Company will be required to write-off these proved reserves. In addition, under the SEC's rules, because proved undeveloped reserves may be booked only if they relate to wells planned to be drilled within five years of the date of booking,this concentration, the Company may be requireddisproportionately exposed to write-off any proved undeveloped reserves that are not developed within this five-year timeframe. As with all oil and gas leases, the Company's leases require the Company to drill wells that are commercially productive and to maintain theimpact of delays or interruptions of operations or production in paying quantities, and if the Company is unsuccessful in drillingthis area caused by external factors such wells and maintaining such production, the Company could lose its rights under such leases. The Company's future production levels and, therefore, its future cash flow and income are highly dependent on successfully developing its proved undeveloped leasehold acreage.
The Company's actual production could differ materially from its forecasts.
From time to time, the Company provides forecasts of expected quantities of future oil and gas production and other financial and operating results. These forecasts are based on a number of estimates and assumptions, including that none of the risks associated with the Company's oil and gas operations summarized in this "Item 1A. Risk Factors" occur. Production forecasts, specifically, are based on assumptions such as:
expectations of production from existing wells and future drilling activity;
the absence of facilityas governmental regulation, state politics, market limitations, water or equipment malfunctions;
the absence of adversesand shortages or extreme weather effects;
expectations of commodity prices, which could experience significant volatility;
expected well costs; and
the assumed effects of regulation by governmental agencies, which could make certain drilling activities or production uneconomical.
Should any of these assumptions prove inaccurate, or should the Company's development plans change, actual production could be materially and adversely affected.
Because the Company's proved reserves and production decline continually over time, the Company will need to mitigate these declines through drilling and production enhancement initiatives and/or acquisitions.
Producing oil and gas reservoirs are characterized by declining production rates, which vary depending upon reservoir characteristics and other factors. Because the Company's proved reserves and production decline continually over time as those reserves are produced, the Company will need to mitigate these declines through drilling and production enhancement initiatives and/or acquisitions of additional recoverable reserves. There can be no assurance that the Company will be able to develop, exploit, find or acquire sufficient additional reserves to replace its current or future production.related conditions.
The Company may not be able to obtain access on commercially reasonable terms or otherwise to pipelines and storage facilities, gathering systems and other transportation, processing, fractionation, refining and export facilities to market its oil, NGL and gas production; the Company relies on a limited number of purchasers for a majority of its products.
The marketing of oil, NGLsNGL and gas production depends in large part on the availability, proximity and capacity of pipelines and storage facilities, gathering systems and other transportation, processing, fractionation, refining and export facilities, as well as the existence of adequate markets. If there were insufficient capacity available on these systems, if these systems were unavailable to the Company or if access to these systems were to become commercially unreasonable, the price offered for the Company's production could be significantly depressed, or the Company could be forced to shut in some production or delay or discontinue drilling plans and commercial production following a discovery of hydrocarbons while it constructs its own facility or awaits the availability of third party facilities. The Company also relies (and expects to rely in the future) on facilities developed and owned by third parties in order to gather, store, process, transport, fractionate, refine, export and sell its oil, NGL and gas production. The Company's plans to develop and sell production from its oil and gas reserves could be materially and adversely affected by the inability or unwillingness of third parties to provide sufficient gathering, transportation, storage, or processing, fractionation, refining or export facilities to the Company, especially in areas of planned expansion where such facilities do not currently exist. Additionally, certain of these challenges may be compounded by a high level of industry activity in the Permian Basin.

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For example, following Hurricane Harvey in 2017 and Hurricanes Gustav and Ike in 2008, certain Permian Basin gas processors were forced to shut down their plants due to the inability of certain Texas Gulf Coast NGL fractionators to operate. The Company was able to produce its oil wells and vent or flare the associated gas; however, there is no certainty the Company will be able to vent or flare gas in the future due to potential changes in regulations.The amount of oil and gas that can be produced is subject to limitations in certain circumstances, such as pipeline interruptions due to scheduled and unscheduled maintenance, excessive pressure, physical damage to the gathering, transportation, storage, processing, fractionation, refining or

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export facilities, or lack of capacity at such facilities. The Company has periodically experienced high line pressure at its tank batteries, which has occasionally led to the flaring of gas due to the inability of the gas gathering systems in the areas to support the increased gas production. The curtailments arising from these and similar circumstances may last from a few days to several months, and in many cases, the Company may be provided only limited, if any, notice as to when these circumstances will arise and their duration.
To the extent that the Company enters into transportation contracts with pipelines that are subject to FERC regulation, the Company is subject to FERC requirements related to use of such capacity. Any failure on the Company's part to comply with FERC's regulations and policies related to pipeline transportation, reporting requirements, or other regulations, and any failure to comply with a FERC-related pipeline's tariff, could result in the imposition of civil and criminal penalties. In addition, any changes in FERC or state regulations or requirements on pipeline transportation may result in increased transportation costs on pipelines that are subject to such regulation, thereby negatively impacting the Company's profitability.
A limited number of companies purchase a majority of the Company's oil, NGLsNGL and gas. The loss of a significant purchaser could have a material adverse effect on the Company's ability to sell its production.
The Company's operations and drilling activity are concentrated in the Permian Basin of West Texas, an area of high industry activity, which may affect its ability to obtain the personnel, equipment, services, resources and facilities access needed to complete its development activities as planned or result in increased costs; such concentration also makes the Company vulnerable to risks associated with operating in a limited geographic area.
The Company's producing properties are geographically concentrated in the Permian Basin of West Texas. At December 31, 2017, 77 percent of the Company's total estimated proved reserves were attributable to properties located in this area. In addition, the Company's operations and drilling activity are concentrated in this area where industry activity is high. As a result, demand for personnel, equipment, power, services and resources has increased, as well as the costs for these items. Any delay or inability to secure the personnel, equipment, power, services and resources could result in oil, NGL and gas production volumes being below the Company's forecasted volumes. In addition, any such negative effect on production volumes, or significant increases in costs, could have a material adverse effect on the Company's results of operations, cash flow and profitability.
As a result of this concentration, the Company may be disproportionately exposed to the impact of delays or interruptions of operations or production in this area caused by external factors such as governmental regulation, state politics, market limitations, water or sand shortages or extreme weather related conditions.
Pioneer's operations are substantially dependent upon the availability of water and its ability to dispose of produced water gathered from drilling and production activities. Restrictions on the Company's ability to obtain water or dispose of produced water may have a material adverse effect on its financial condition, results of operations and cash flows.
Water is an essential component of both the drilling and hydraulic fracturing processes. Limitations or restrictions on the Company's ability to secure sufficient amounts of water (including limitations resulting from natural causes such as drought), could materially and adversely impact its operations. Severe drought conditions can result in local water districts taking steps to restrict the use of water in their jurisdiction for drilling and hydraulic fracturing in order to protect the local water supply. If the Company is unable to obtain water to use in its operations from local sources, it may need to be obtained from new sources and transported to drilling sites, resulting in increased costs, which could have a material adverse effect on its financial condition, results of operations and cash flows.
In addition, the Company must dispose of the fluids produced from oil and gas production operations, including produced water, which it does directly or through the use of third party vendors. The legal requirements related to the disposal of produced water into a non-producing geologic formation by means of underground injection wells are subject to change based on concerns of the public or governmental authorities regarding such disposal activities. One such concern arises from recent seismic events near underground disposal wells that are used for the disposal by injection of produced water resulting from oil and gas activities. In March 2016, the United States Geological Survey identified Texas and Colorado as being among the states with areas of increased rates of induced seismicity that could be attributed to fluid injection or oil and gas extraction. In response to concerns regarding induced seismicity, regulators in some states have imposed, or are considering imposing, additional requirements in the permitting of produced water disposal wells to assess any relationship between seismicity and the use of such wells. For example, in Texas, the Texas Railroad Commission adopted new rules governing the permitting or re-permitting of wells used to dispose of produced water and other fluids resulting from the production of oil and gas in order to address these seismic activity concerns within the state. Among other things, these rules require companies seeking permits for disposal wells to provide seismic activity data in permit applications, provide for more frequent monitoring and reporting for certain wells and allow the state to modify, suspend or terminate permits on grounds that a disposal well is likely to be, or determined to be, causing seismic activity.

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States may issue orders to temporarily shut down or to curtail the injection depth of existing wells in the vicinity of seismic events. Another consequence of seismic events may be lawsuits alleging that disposal well operations have caused damage to neighboring properties or otherwise violated state and federal rules regulating waste disposal. These developments could result in additional regulation and restrictions on the use of injection wells by the Company or by commercial disposal well vendors whom the Company may use from time to time to dispose of produced water. Increased regulation and attention given to induced seismicity could also lead to greater opposition, including litigation to limit or prohibit oil and gas activities utilizing injection wells for produced water disposal. Any one or more of these developments may result in the Company or its vendors having to limit disposal well volumes, disposal rates and pressures or locations, or require the Company or its vendors to shut down or curtail the injection into disposal wells, which events could have a material adverse effect on the Company's business, financial condition and results of operations.
The Company could experience periods of higher costs if commodity prices rise. These increases could reduce the Company's profitability, cash flow and ability to complete development activities as planned.
Historically, the Company's capital and operating costs have risen during periods of increasing oil, NGL and gas prices. These cost increases result from a variety of factors beyond the Company's control, such as increases in the cost of electricity, steel and other raw materials that the Company and its vendors rely upon; increased demand for labor, services and materials as drilling activity increases; and increased production and ad valorem taxes. Decreased levels of drilling activity in the oil and gas industry in recent periods have led to cost reductions for some drilling equipment, materials and supplies. However, such costs may rise faster than increases in the Company's revenue if commodity prices rise, thereby negatively impacting the Company's profitability, cash flow and ability to complete development activities as scheduled and on budget. This impact may be magnified to the extent that the Company's ability to participate in the commodity price increases is limited by its derivative risk management activities.
The refining industry may be unable to absorb rising U.S. oil and condensate production; in such a case, the resulting surplus could depress prices and restrict the availability of markets, which could materially and adversely affect the Company's results of operations.
Absent an expansion of U.S. refining and export capacity, risingan increase in U.S. production of oil and condensates could result in a surplus of these products in the U.S., which would likely cause prices for these commodities to fall and markets to constrict. Although U.S. law was changed in 2015 to permit the export of oil, exports may not occur if demand is lacking in foreign markets or the price that can be obtained in foreign markets does not support associated export capacity expansions, transportation and other costs. In such circumstances, the returnsrate of return on the Company's capital projects would decline, possibly to levels that would make execution of the Company's drilling plans uneconomical, and a lack of market for the Company's products could require that the Company shut in some portion of its production. If this were to occur, the Company's production and cash flow could decrease, or could increase less than forecasted, which could have a material adverse effect on the Company's cash flow and profitability.
The Company's operations are subject to stringent environmental and oil and gas-related laws and regulations that could cause it to suspend or curtail its operations or expose it to material costs and liabilities.
The Company's operations are subject to stringent federal, state and local laws and regulations governing, among other things, the drilling of wells, developing rates of production, the size and shape of drilling and spacing units or proration units, the transportation and sale of oil, NGLs and gas, and the discharging of materials into the environment and environmental protection. In connection with its operations, the Company must obtain and maintain numerous environmental and oil and gas-related permits, approvals, and certificates from various federal, state and local governmental authorities, and may incur substantial costs in doing so. The need to obtain permits has the potential to delay the development of oil and gas projects. Over the next several years, the Company may be charged royalties on gas emissions or required to incur certain capital expenditures for air pollution control equipment or other air emissions-related issues. For example, in October 2015, the EPA issued a final rule under the CAA lowering the National Ambient Air Quality Standard ("NAAQS") for ground-level ozone from 75 parts per billion to 70 parts per billion under standards to provide protection of public health and welfare. In November 2017, the EPA published a final rule that issued area designations with respect to ground-level ozone for approximately 85% of the U.S. counties as either "attainment/unclassifiable" or "unclassifiable" but has not yet issued non-attainment designations for the remaining areas of the U.S. not addressed under the November 2017 final rule. Reclassification of areas or imposition of more stringent standards may make it more difficult to construct new or modify air pollution control systems to reduce or eliminate sources of air pollution in newly designated non-attainment areas. Moreover, states are expected to implement regulations implementing the NAAQS rule that may be more stringent than the federal standards. In another example, in June 2016, the EPA published a final rule updating federal permitting regulations for stationary sources in the oil and gas industry by defining and clarifying the meaning of the term "adjacent" for determining when separate surface sites and the equipment at those sites will be aggregated for permitting purposes. Future compliance with these legal requirements or with any new or amended environmental laws or regulations could, among other things, delay, restrict or prohibit the issuance of necessary permits, increase the Company's capital expenditures and operating

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expenses by, for example, requiring installation of new emission controls on some of the Company's equipment, any one or more of which developments could have a material adverse effect on the Company's business, financial condition and results of operations.
There can be no assurance that present or future regulations will not result in a curtailment of production or processing activities, result in a material increase in the costs of production, development, exploration or processing operations or materially and adversely affect the Company's future operations and financial condition. Noncompliance with these laws and regulations may subject the Company to sanctions, including administrative, civil or criminal penalties, remedial cleanups or corrective actions, delays in permitting or performance of projects, natural resource damages and other liabilities. Such laws and regulations may also affect the costs of acquisitions. In addition, these laws and regulations are subject to amendment or replacement by more stringent laws and regulations.
The nature of the Company's assets and production operations may impact the environment or cause environmental contamination, which could result in material liabilities to the Company.
The Company's assets and production operations may give rise to significant environmental costs and liabilities as a result of the Company's handling of petroleum hydrocarbons and wastes, because of air emissions and water discharges related to its operations, and due to past industry operations and waste disposal practices. The Company's oil and gas business involves the generation, handling, treatment, storage, transport and disposal of wastes, hazardous substances and petroleum hydrocarbons and is subject to environmental hazards, such as oil and produced water spills, NGL and gas leaks, pipeline and vessel ruptures and unauthorized discharges of such wastes, substances and hydrocarbons, that could expose the Company to substantial liability due to pollution and other environmental damage. The Company currently owns, leases or operates, and in the past has owned, leased or operated, properties that for many years have been used for oil and gas exploration and production activities, and petroleum hydrocarbons, hazardous substances and wastes may have been released on or under such properties, or on or under other locations, including off-site locations, where such substances have been taken for treatment or disposal. These wastes, substances and hydrocarbons may also be released during future operations. In addition, some of the Company's properties have been operated by predecessors or previous owners or operators whose treatment and disposal of hazardous substances, wastes or petroleum hydrocarbons were not under the Company's control. Joint and several strict liabilities may be incurred in connection with such releases of petroleum hydrocarbons, hazardous substances and wastes on, under or from the Company's properties. Private parties, including lessors of properties on which the Company operates and the owners or operators of properties adjacent to the Company's operations and facilities where the Company's petroleum hydrocarbons, hazardous substances or wastes are taken for reclamation or disposal, may also have the right to pursue legal actions to enforce compliance as well as seek damages for noncompliance with environmental laws and regulations or for personal injury or property damage. Such properties and the substances disposed or released on or under them may be subject to CERCLA, RCRA and analogous state laws, which could require the Company to remove previously disposed substances, wastes and petroleum hydrocarbons, remediate contaminated property or perform remedial plugging or pit closure operations to prevent future contamination, the costs of which could have a material adverse effect on the Company's business, financial condition and results of operations.
The Company may not be able to recover some or any of these costs from sources of contractual indemnity or insurance, as pollution and similar environmental risks generally are not fully insurable, either because such insurance is not available or because of the high premium costs and deductibles associated with obtaining such insurance.
Climate change legislation and regulatory initiatives restricting emissions of GHGs could result in increased operating costs and reduced demand for the oil, NGLs and gas the Company produces and the potential physical effects of climate change could disrupt the Company's production and cause the Company to incur significant costs in preparing for or responding to those effects.
Climate change continues to attract considerable public, political and scientific attention. As a result, numerous proposals have been made and are likely to continue to be made at the international, national, regional and state levels of government to monitor and limit emissions of GHGs. These efforts have included consideration of cap-and-trade programs, carbon taxes, GHG reporting and tracking programs, and regulations that directly limit GHG emissions from certain sources.
At the federal level, no comprehensive climate change legislation has been implemented to date. The EPA has, however, adopted regulations under the CAA that, among other things, establish certain permits and construction reviews designed to allow operations while ensuring the prevention of significant deterioration in air quality by GHG emissions from large stationary sources that are already potential sources of significant pollutant emissions. The Company could become subject to these permitting requirements and be required to install "best available control technology" to limit emissions of GHGs from any new or significantly modified facilities that the Company may seek to construct in the future if they would otherwise emit large volumes of GHGs from such sources. The EPA has also adopted rules requiring the reporting of GHG emissions on an annual basis from specified GHG emission sources in the United States, including certain oil and gas production facilities, which include certain of the Company's facilities. Federal agencies also have begun directly regulating emissions of methane, a GHG, from oil and gas

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operations. In June 2016, the EPA published a final rule establishing New Source Performance Standards, known as Subpart OOOOa, that require certain new, modified or reconstructed facilities in the oil and gas sector to reduce certain methane gas and volatile organic compound emissions. These Subpart OOOOa standards expand previously issued New Source Performance Standards, published by the EPA in 2012 and known as Subpart OOOO, by using certain equipment-specific emissions control practices. However, in June 2017, the EPA published a proposed rule to stay certain portions of these Subpart OOOOa standards for two years and revisit the entirety of the 2016 standard, but has not yet published a final rule. As a result, future implementation of the 2016 standards is uncertain at this time. Furthermore, with respect to a final rule published by the BLM in November 2016 and imposing requirements to reduce methane emissions from venting, flaring and leaking on public lands, the BLM has since published a proposed rulemaking in October 2017 that would temporarily suspend certain requirements contained in the November 2016 final rule until January 17, 2019, but the October 2017 rulemaking has not yet been finalized.
At the state level, some states are considering and other states, including Colorado, where the Company conducts operations, have issued requirements for the performance of leak detection programs that identify and repair methane leaks at certain oil and gas sources. State rules may be more stringent than federal rules. Compliance with the EPA's June 2016, the BLM's November 2016 rule or with any future federal or state methane regulations could, among other things, require installation of new emission controls on some of the Company's equipment and significantly increase the Company's capital expenditures and operating costs.
Internationally, in December 2015, the United States joined the international community at the 21st Conference of the Parties of the United Nations Framework Convention on Climate Change in Paris, France that prepared an agreement requiring member countries to review and "represent a progression" in their intended nationally determined contributions, which set GHG emission reduction goals every five years beginning in 2020. This "Paris agreement" was signed by the United States in April 2016 and entered into force in November 2016. Although this agreement does not create any binding obligations for nations to limit their GHG emissions, it does include pledges to voluntarily limit or reduce future emissions. In August 2017, the U.S. State Department officially informed the United Nations of the United States' intention to withdraw from the Paris agreement. The Paris agreement provides for a four-year exit process beginning when it took effect in November 2016, which would result in an effective exit date of November 2020. The United States' adherence to the exit process and/or the terms on which the United States may re-enter the Paris agreement or a separately negotiated agreement are unclear at this time.
The adoption and implementation of any federal or state legislation or regulations or international agreements that require reporting of GHGs or otherwise restrict emissions of GHGs from the Company's equipment and operations could require the Company to incur increased operating costs, such as costs to purchase and operate emissions control systems, acquire emissions allowances or comply with new regulatory or reporting requirements, including the imposition of a carbon tax, any of which could have a material adverse effect on the Company's business, financial condition and results of operations. Moreover, such new legislation or regulatory programs as well as conservation plans and efforts undertaken in response to climate change could also materially and adversely affect demand for the oil, NGLs and gas the Company produces and lower the value of its reserves. Depending on the severity of any such limitations, the effect on the value of the Company's reserves could be material. In addition, recent non-governmental activism directed at shifting funding away from companies with energy-related assets could result in limitations or restrictions on certain sources of funding for the energy sector.
Finally, it should be noted that some scientists have concluded that increasing concentrations of GHGs in the Earth's atmosphere may produce climate changes that have significant physical effects, such as increased frequency and severity of storms, floods, droughts and other extreme climatic events. If any such effects were to occur, they could have a material adverse effect on the Company's exploration and production operations.
Federal, state and local legislative and regulatory initiatives relating to hydraulic fracturing, as well as governmental reviews of such activities, could result in increased costs and additional operating restrictions or delays and materially and adversely affect the Company's production.
Hydraulic fracturing is a common practice that is used to stimulate production of hydrocarbons from tight formations. The Company conducts hydraulic fracturing in the majority of its drilling and completion programs. The process involves the injection of water, sand and additives under pressure into targeted subsurface formations to stimulate oil and gas production. The process is typically regulated by state oil and gas commissions, but in recent years, several federal agencies have conducted investigations or asserted regulatory authority over certain aspects of the process. For example, in December 2016, the EPA released its final report on the potential impacts of hydraulic fracturing on drinking water resources, concluding that "water cycle" activities associated with hydraulic fracturing may impact drinking water resources under certain circumstances. Additionally, the EPA has asserted regulatory authority pursuant to the SDWA's UIC program over hydraulic fracturing activities involving the use of diesel and issued guidance covering such activities. Moreover, in June 2016, the EPA published an effluent water final rule prohibiting the discharge of wastewater from onshore unconventional oil and gas extraction facilities to publicly-owned wastewater treatment plants, and in 2014, the EPA issued a prepublication of its Advance Notice of Proposed Rulemaking regarding Toxic Substances Control Act reporting of the chemical substances and mixtures used in hydraulic fracturing. Also, the BLM published a final rule

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in March 2015 that established new or more stringent standards relating to hydraulic fracturing on federal and American Indian lands. However, with respect to this BLM rule, a Wyoming federal judge struck down this rule in June 2016, finding that the BLM lacked congressional authority to promulgate the rule, the BLM appealed the decision in July 2017, the appellate court issued a ruling in September 2017 to vacate the Wyoming trial court decision and dismiss the lawsuit challenging the 2015 rule in response to the BLM's issuance of a proposed rulemaking to rescind the 2015 rule and, on December 29, 2017, the BLM published a final rule rescinding the March 2017 rule.
From time to time, the U.S. Congress has considered adopting legislation intended to provide for federal regulation of hydraulic fracturing and to require disclosure of the additives used in the hydraulic-fracturing process. In addition, certain states in which the Company operates, including Texas and Colorado, have adopted, and other states are considering adopting, regulations that could impose new or more stringent permitting, disclosure, disposal and well-construction requirements on hydraulic-fracturing operations. States could elect to prohibit high volume hydraulic fracturing altogether, following the lead of New York. Also, local land use restrictions, such as city ordinances, may restrict or prohibit drilling in general or hydraulic fracturing in particular although in May 2015 in response to one city in Texas voting to ban hydraulic fracturing within city limits the Texas Legislature adopted Texas House Bill 40, which provides that the regulation of oil and gas operations in Texas is under the exclusive jurisdiction of the state and preempted local regulation of those operations. Despite Texas House Bill 40, municipalities and political subdivisions in Texas continue to have the right to enact "commercially reasonable" regulations for surface activities. In the event federal, state or local restrictions pertaining to hydraulic fracturing are adopted in areas where the Company is currently conducting operations, or in the future plans to conduct operations, the Company may incur additional costs to comply with such requirements that may be significant in nature, experience delays or curtailment in the pursuit of exploration, development or production activities, and perhaps be limited or precluded in the drilling of wells or in the volume that the Company is ultimately able to produce from its reserves.
Laws and regulations pertaining to threatened and endangered species could delay or restrict the Company's operations and cause it to incur substantial costs.
Various federal and state statutes prohibit certain actions that adversely affect endangered or threatened species and their habitats, migratory birds, wetlands and natural resources. These statutes include the ESA, the Migratory Bird Treaty Act, the CWA, OPA and CERCLA. The U.S. Fish and Wildlife Service (the "FWS") may designate critical habitat and suitable habitat areas that it believes are necessary for survival of threatened or endangered species. Any designation by the FWS of a critical or suitable habitat with respect to a threatened or endangered species could result in further material restrictions to federal land use and private land use and could delay or prohibit land access or oil and gas development. If harm to species or damages to wetlands, habitat or natural resources occur or may occur, government entities or, at times, private parties may act to prevent oil and gas exploration or development activities or seek damages for harm to species, habitat or natural resources resulting from drilling, construction or releases of petroleum hydrocarbons, wastes, hazardous substances or other regulated materials, and, in some cases, may seek criminal penalties. Moreover, as a result of one or more settlements entered into by the FWS, the agency is required to make determinations on the potential listing of numerous species as endangered or threatened under the ESA. The designation of previously unprotected species as threatened or endangered in areas where the Company conducts operations could cause the Company to incur increased costs arising from species protection measures or could result in delays or limitations on its development and production activities that could have a material adverse effect on the Company's ability to develop and produce reserves.
The Company is a party to debt instruments, a credit facility and other financial commitments that may restrict its business and financing activities.
The Company is a borrower under fixed rate senior notes and maintains a credit facility that is currently undrawn. The terms of the Company's borrowings specify scheduled debt repayments and require the Company to comply with certain associated covenants and restrictions. The Company's ability to comply with the debt repayment terms, associated covenants and restrictions is dependent on, among other things, factors outside the Company's direct control, such as commodity prices and interest rates. In addition, from time to time, the Company enters into arrangements and transactions that can give rise to material off-balance sheet obligations, including firm purchase, transportation and fractionation commitments, gathering, processing and transportation commitments on uncertain volumes of future throughput, operating lease agreements and drilling commitments. The Company's financial commitments could have important consequences to its business including, but not limited to, the following:
the incurrence of charges associated with unused commitments if future events do not meet the Company's expectations at the time such commitments are entered into;
increasing its vulnerability to adverse economic and industry conditions;
limiting its flexibility to plan for, or react to, changes in its business and industry;
limiting its ability to fund future development activities or engage in future acquisitions; and
placing it at a competitive disadvantage compared to competitors that have less debt and/or fewer financial commitments.

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See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Capital Commitments, Capital Resources and Liquidity" and Notes G and J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's outstanding debt and other commitments as of December 31, 2017 and the terms associated therewith.
The Company's ability to obtain additional financing is also affected by the Company's debt credit ratings and competition for available debt financing. A ratings downgrade could materially and adversely impact the Company's ability to access debt markets, increase the borrowing cost under the Company's credit facility and the cost of future debt, and potentially require the Company to post letters of credit or other forms of collateral for certain obligations.
The Company faces significant competition and some of its competitors have resources in excess of the Company's available resources.
The oil and gas industry is highly competitive. The Company competes with a large number of companies, producers and operators in a number of areas such as:
seeking to acquire oil and gas properties suitable for development or exploration;
marketing oil, NGL and gas production; and
seeking to acquire the equipment and expertise, including trained personnel, necessary to evaluate, operate and develop its properties.
Some of the Company's competitors are larger and have substantially greater financial and other resources than the Company. To a lesser extent, the Company also faces competition from companies that supply alternative sources of energy, such as wind or solar power. See "Item 1. Business - Competition, Markets and Regulations" for additional discussion regarding competition.
The Company's transportation of gas, sales and purchases of oil, NGLs, gas or other energy commodities, and any derivative activities related to such energy commodities, expose the Company to potential regulatory risks.
The FERC, the FTC and the CFTC hold statutory authority to monitor certain segments of the physical and futures energy commodities markets relevant to the Company's business. These agencies have imposed broad regulations prohibiting fraud and manipulation of such markets. With regard to the Company's transportation of gas in interstate commerce, physical sales and purchases of oil, NGLs, gas or other energy commodities, and any derivative activities related to these energy commodities, the Company is required to observe the market-related regulations enforced by these agencies, which hold substantial enforcement authority. Failures to comply with such regulations, as interpreted and enforced, could materially and adversely affect the Company's results of operations and financial condition.
Estimates of proved reserves and future net cash flows are not precise. The actual quantities and net cash flows of the Company's proved reserves may prove to be lower than estimated.
Numerous uncertainties exist in estimating quantities of proved reserves and future net cash flows therefrom. The estimates of proved reserves and related future net cash flows set forth in this Report are based on various assumptions, which may ultimately prove to be inaccurate.
Petroleum engineering is a subjective process of estimating underground accumulations of oil and gas that cannot be measured in an exact manner. Estimates of economically recoverable oil and gas reserves and estimates of future net cash flows depend upon a number of variable factors and assumptions, including the following:
historical production from the area compared with production from other producing areas;
the quality and quantity of available data;
the interpretation of that data;
the assumed effects of regulations by governmental agencies;
assumptions concerning future commodity prices; and
assumptions concerning future development costs, operating costs, severance, ad valorem and excise taxes, gathering, processing, transportation and fractionation costs and workover and remedial costs.
Because all proved reserve estimates are to some degree subjective, each of the following items may differ materially from those assumed in estimating proved reserves:
the quantities of oil and gas that are ultimately recovered;
the production costs incurred to recover the reserves;
the amount and timing of future development expenditures; and
future commodity prices.

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Furthermore, different reserve engineers may make different estimates of proved reserves and cash flows based on the same available data. The Company's actual production, revenues and expenditures with respect to proved reserves will likely be differentdiffer from the estimates, and the differences may be material.

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As required by the SEC, the estimated discounted future net cash flows from proved reserves are based on average prices preceding the date of the estimate and costs as of the date of the estimate, while actual future prices and costs may be materially higher or lower. Actual future net cash flows also will be affected by factors such as:
the amount and timing of actual production;
levelsthe level of future capital spending;
increases or decreases in the supply of or demand for oil, NGLsNGL and gas; and
changes in governmental regulations or taxation.
Standardized Measure is a reporting convention that provides a common basis for comparing oil and gas companies subject to the rules and regulations of the SEC. In general, it requires the use of commodity prices that are based upon a historical 12-month unweighted average, as well as operating and development costs being incurred at the end of the reporting period. Consequently, it may not reflect the prices ordinarily received or that will be received for future oil and gas production because of seasonal price fluctuations or other varying market conditions, nor may it reflect the actual costs that will be required to produce or develop the oil and gas properties. Accordingly, estimates included herein of future net cash flows may be materially different from the future net cash flows that are ultimately received. In addition, the ten percent discount factor, which is required by the SEC to be used in calculating discounted future net cash flows for reporting purposes, may not be the most appropriate discount factor based on interest rates in effect from time to time and risks associated with the Company or the oil and gas industry in general. Therefore, the estimates of discounted future net cash flows or Standardized Measure in this Report should not be construed as accurate estimates of the current market value of the Company's proved reserves.
Because the Company's producing wells decline continually over time, the Company will need to mitigate these declines through drilling and production enhancement initiatives and/or acquisitions.
Producing oil and gas reservoirs are characterized by declining production rates, which vary depending upon reservoir characteristics and other factors. Because the Company's producing wells decline continually over time as those wells are produced, the Company will need to mitigate these declines through drilling and production enhancement initiatives and/or acquisitions of additional recoverable reserves. There can be no assurance that the Company will be able to develop, exploit, find or acquire sufficient additional reserves to replace its current or future production.
A portion of the Company's total estimated proved reserves at December 31, 2020 were undeveloped, and those proved reserves may not ultimately be developed.
At December 31, 2020, approximately five percent of the Company's total estimated proved reserves were undeveloped. Recovery of undeveloped proved reserves requires significant capital expenditures and successful drilling. The Company's reserve data assumes that the Company can and will make these expenditures and conduct these operations successfully, which assumptions may not prove to be correct. If the Company chooses not to spend the capital to develop these proved undeveloped reserves, or if the Company is not otherwise able to successfully develop these proved undeveloped reserves, the Company will be required to write-off these proved reserves. In addition, under the SEC's rules, because proved undeveloped reserves may be booked only if they relate to wells planned to be drilled within five years of the date of booking, the Company may be required to write-off any proved undeveloped reserves that are not developed within this five-year timeframe. As with all oil and gas leases, the Company's leases require the Company to drill wells that are commercially productive and to maintain the production in paying quantities, and if the Company is unsuccessful in drilling such wells and maintaining such production, the Company could lose its rights under such leases. In addition, the Company's future production levels and, therefore, its future cash flow and profitability will be impacted if it is not able to successfully develop its undeveloped leasehold acreage.
The Company faces significant competition and some of its competitors have resources in excess of the Company's available resources.
The oil and gas industry is highly competitive. The Company competes with a large number of companies, producers and operators in a number of areas such as:
seeking to acquire oil and gas properties suitable for exploration or development;
marketing oil, NGL and gas production; and
seeking to acquire the equipment, services and expertise, including trained personnel, necessary to identify, evaluate, develop and operate its properties.
Some of the Company's competitors are larger and have substantially greater financial and other resources than the Company, and as such, the Company may be at a competitive disadvantage in the identification, acquisition and development of properties that complement the Company's operations. The Company also faces competition from companies that supply alternative sources of energy, such as wind, solar power or other renewable energy. Competition is expected to increase and in

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certain cases, governments are providing tax advantages and other subsidies to support alternative energy sources or are mandating the use of specific fuels or technologies. Governments and other parties are also promoting research into new technologies to accelerate the implementation of alternative energy sources.
The Company's business could be materially and adversely affected by security threats, including cybersecurity threats, and other disruptions.
As an oil and gas producer, the Company faces various security threats, including cybersecurity threats to gain unauthorized access to, or control of, sensitive information or to render data or systems corrupted or unusable; threats to the security of the Company's facilities and infrastructure or third party facilities and infrastructure, such as processing plants and pipelines; and threats from terrorist acts. The potential for such security threats has subjected the Company's operations to increased risks that could have a material adverse effect on the Company's business. In particular, the Company's implementation of various procedures and controls to monitor and mitigate security threats and to increase security for the Company's information, facilities and infrastructure may result in increased capital and operating costs. Costs for insurance may also increase as a result of security threats, and some insurance coverage may become more difficult to obtain, if available at all. Moreover, there can be no assurance that such procedures and controls will be sufficient to prevent security breaches from occurring. If any of these security breaches were to occur, they could lead to losses of sensitive information, critical infrastructure or capabilities essential to the Company's operations and could have a material adverse effect on the Company's reputation, financial position, results of operations and cash flows.
Cybersecurity attacks in particular are becoming more sophisticated. The Company relies extensively on information technology systems, including Internetinternet sites, computer software, data hosting facilities and other hardware and platforms, some of which are hosted by third parties, to assist in conducting its business. The Company's technologies systems and networks, and those of its business associates may become the target of cybersecurity attacks, including without limitation denial-of-service attacks, malicious software, data privacy breaches by employees, insiders or others with authorized access, cyber or phishing-attacks, ransomware, attempts to gain unauthorized access to data and systems, and other electronic security breaches that could lead to disruptions in critical systems and materially and adversely affect the Company in a variety of ways, including the following:
unauthorized access to and release of seismic data, reserves information, strategic information or other sensitive or proprietary information, which could have a material adverse effect on the Company's ability to compete for oil and gas resources;
data corruption, communication interruption or other operational disruptions during drilling activities, which could result in the failure to reach the intended target or a drilling incident;
data corruption or operational disruptiondisruptions of production infrastructure, which could result in loss of production or accidental discharge;discharges;
unauthorized access to and release of personal identifying information of royalty owners, employees and vendors, or the data or confidential information of customers, suppliers or other third parties, which could expose the Company to allegations that it did not sufficiently protect that information;
a cybersecurity attack on a vendor or service provider, which could result in supply chain disruptions and could delay or halt operations; and
a cybersecurity attack on third-party gathering, transportation, processing, fractionation, refining, storage or export facilities, which could delay or prevent the Company from transporting and marketing its production, resulting in a loss of revenues.revenues;
a cybersecurity attack involving commodities exchanges or financial institutions, which could slow or halt commodities trading, thus preventing the Company from marketing its production or engaging in derivative activities, resulting in a loss of revenues;
a cybersecurity attack on a communications network or power grid, which could cause operational disruptions resulting in the loss of revenues; and
a cybersecurity attack on the Company's automated and surveillance systems, which could cause a loss in production and potential environmental hazards.
These events could damage the Company's reputation and lead to financial losses from remedial actions, loss of business or potential liability. Additionally, certain cyber incidents, such as surveillance, may remain undetected for an extended period.period of time.

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such attacks. However, there is no assurance that the Company will not suffer such losses in the future. As cyber threats continue to evolve, the Company may be required to expend significant additional resources to continue

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to modify or enhance its protective measures or to investigate and remediate any information security vulnerabilities.
A failure by purchasers Additionally, the continuing and evolving threat of the Company's production to satisfy their obligations to the Companycybersecurity attacks has resulted in evolving legal and compliance matters, including increased regulatory focus on prevention, which could require the Company to recognize a charge in earnings and have a material adverse effect on the Company's results of operation.
The Company relies on a limited number of purchasersexpend significant additional resources to purchase a majority of its products. To the extent that purchasers of the Company's production rely on access to the credit or equity markets to fund their operations, there is a risk that those purchasers could default in their contractual obligations to the Company ifmeet such purchasers were unable to access the credit or equity markets for an extended period of time. If for any reason the Company were to determine that it was probable that some or all of the accounts receivable from any one or more of the purchasers of the Company's production were uncollectible, the Company would recognize a charge in the earnings of that period for the probable loss.
Declining general economic, business or industry conditions could have a material adverse effect on the Company's results of operations.
Since 2016, the economies in the United States and certain countries in Europe and Asia have continued to stabilize with resulting improvements in industrial demand and consumer confidence. However, other economies, such as those of certain South American nations, continue to face economic struggles or slowing economic growth. If these conditions worsen, combined with a decline in economic growth in other parts of the world, there could be a significant adverse effect on global financial markets and commodity prices. In addition, continued hostilities in the Middle East and the occurrence or threat of terrorist attacks in the United States or other countries could adversely affect the global economy. If the economic climate in the United States or abroad were to deteriorate, demand for petroleum products could diminish, which could depress the prices at which the Company could sell its oil, NGLs and gas and ultimately decrease the Company's cash flows and profitability.
The Company's use of seismic data is subject to interpretation and may not accurately identify the presence of oil and gas, which could materially and adversely affect the results of its drilling operations.
Even when properly used and interpreted, seismic data and visualization techniques are only tools used to assist geoscientists in identifying subsurface structures and hydrocarbon indicators and do not enable the interpreter to know whether hydrocarbons are, in fact, present in those structures. As a result, the Company's drilling activities may not be successful or economic. In addition, the use of advanced technologies, such as 3-D seismic data, requires greater pre-drilling expenditures than traditional drilling strategies, and the Company could incur losses as a result of such expenditures.
The enactment of derivatives legislation could have a material adverse effect on the Company's ability to use derivative instruments to reduce the effect of commodity price, interest rate and other risks associated with its business.
The Dodd-Frank Act enacted in July 2010, established federal oversight and regulation of the over-the-counter derivatives market and entities, such as the Company, that participate in that market. The Dodd-Frank Act requires the CFTC and the SEC to promulgate rules and regulations for its implementation. Although the CFTC has issued final regulations to implement significant aspects of the legislation, others remain to be finalized or implemented and it is not possible at this time to predict when this will be accomplished.
In October 2011, the CFTC issued regulations to set position limits for certain futures and option contracts in the major energy markets and for swaps that are their economic equivalents. The initial position limits rule was vacated by the United States District Court for the District of Columbia in September 2012. However, in November 2013, the CFTC proposed new rules that would place limits on positions in certain futures and options contracts and equivalent swaps for or linked to certain physical commodities, subject to exceptions for certain bona fide derivative transactions. As these new position limit rules are not yet final, the impact of those provisions on the Company is uncertain at this time.
The CFTC has designated certain interest rate swaps and credit default swaps for mandatory clearing and the associated rules also will require the Company, in connection with covered derivative activities, to comply with clearing and trade-execution requirements or take steps to qualify for an exemption to such requirements. The CFTC has not yet proposed rules designating any other classes of swaps, including physical commodity swaps, for mandatory clearing. Although the Company believes it qualifies for the end-user exception from the mandatory clearing requirements for swaps entered to mitigate its commercial risks, the application of the mandatory clearing and trade execution requirements to other market participants, such as swap dealers, may change the cost and availability of the swaps that the Company uses. If the Company's swaps do not qualify for the commercial end-user exception, or if the cost of entering into uncleared swaps becomes prohibitive, the Company may be required to clear such transactions. The ultimate effect of the proposed rules and any additional regulations on the Company's business is uncertain.

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In addition, certain banking regulators and the CFTC have adopted final rules establishing minimum margin requirements for uncleared swaps. Although the Company expects to qualify for the end-user exception from margin requirements for swaps entered into to manage its commercial risks, the application of such requirements to other market participants, such as swap dealers, may change the cost and availability of the swaps that the Company uses. If any of the Company's swaps do not qualify for the commercial end-user exception, the posting of collateral could reduce its liquidity and cash available for capital expenditures and could reduce its ability to manage commodity price volatility and the volatility in its cash flows.
The full impact of the Dodd-Frank Act and related regulatory requirements upon the Company's business will not be known until the regulations are implemented and the market for derivatives contracts has adjusted. The Dodd-Frank Act and any new regulations could significantly increase the cost of derivative contracts, materially alter the terms of derivative contracts, reduce the availability of derivatives to protect against risks the Company encounters and reduce the Company's ability to monetize or restructure its existing derivative contracts. If the Company reduces its use of derivatives as a result of the Dodd-Frank Act and regulations, the Company's results of operations may become more volatile and its cash flows may be less predictable, which could materially and adversely affect the Company's ability to plan for and fund capital expenditures. Finally, the Dodd-Frank Act was intended, in part, to reduce the volatility of oil and gas prices, which some legislators attributed to speculative trading in derivatives and commodity instruments related to oil and gas. The Company's revenues could therefore be materially and adversely affected if a consequence of the Dodd-Frank Act and implementing regulations is to lower commodity prices. Any of these consequences could have a material adverse effect on the Company, its financial condition and its results of operations. In addition, the European Union and other non-U.S. jurisdictions are implementing regulations with respect to the derivatives market. To the extent the Company transacts with counterparties in foreign jurisdictions, it may become subject to such regulations. At this time, the impact of such regulations is not clear.
The future of the SEC and CFTC's rulemaking remains uncertain. Regulatory agendas that were released in late 2017 indicated that the SEC and CFTC plan to pursue fewer rulemaking items than in prior years. For example, the CFTC announced its intent to take action on an agency-wide internal review focused on simplifying and modernizing CFTC rules, regulations and practices and focus on streamlining the implementation of existing regulations and practices. Although the SEC and the CFTC's agendas are less expansive than they have been in the past, wholesale deregulation of the markets will not necessarily be the outcome. For example, the CFTC plans to take a new look at passing rules on position limits for certain futures contracts, and the SEC intends to re-propose rules for "plain vanilla" exchange-traded funds and add amendments to the Volcker Rule.
Moreover, regulation by the CFTC and banking regulators of the over-the-counter derivatives market and market participants could cause the Company's contract counterparties, which are generally financial institutions and other market participants, to curtail or cease their derivatives activities, which could materially and adversely affect the cost and availability of derivatives to the Company.
Provisions of the Company's charter documents and Delaware law may inhibit a takeover, which could limit the price investors might be willing to pay in the future for the Company's common stock.
Provisions in the Company's certificate of incorporation and bylaws may have the effect of delaying or preventing an acquisition of the Company or a merger in which the Company is not the surviving company and may otherwise prevent or slow changes in the Company's board of directors and management. In addition, because the Company is incorporated in Delaware, it is governed by the provisions of Section 203 of the Delaware General Corporation Law. These provisions could discourage an acquisition of the Company or other change in control transactions and thereby negatively affect the price that investors might be willing to pay in the future for the Company's common stock.

The Company has identified a material weakness in its internal control over financial reporting that, if not remediated, could result in additional material misstatements in its consolidated financial statements.

As described in "Part II, Item 9A — Controls and Procedures," management has identified and evaluated the control deficiencies that gave rise to the accounting corrections related to contracts governing the sale of purchased oil and gas and has concluded that those deficiencies, collectively, represent a material weakness in the Company's internal control over financial reporting. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the Company's annual or interim financial statements will not be prevented or detected on a timely basis. As a result of the material weakness, management has concluded that the Company did not maintain effective internal control over financial reporting as of December 31, 2020. See Note 2 of Notes to Consolidated Financial Statements and "Unaudited Supplementary Information - Selected Quarterly Financial Results" included in "Item 8. Financial Statements and Supplementary Data" for additional information.

The Company is in the process of developing and implementing a remediation plan to address the material weakness. If the Company’s remediation efforts are insufficient or if additional material weaknesses in its internal control over financial reporting are discovered or occur in the future, the Company's consolidated financial statements may contain material misstatements and it could be required to revise or restate its financial results, which could materially and adversely affect the Company’s business, results of operations and financial condition, restrict its ability to access the capital markets, require it to expend significant resources to correct the material weakness, subject it to fines, penalties or judgments, harm its reputation or otherwise cause a decline in investor confidence.
Operational risks.
The Company's sand mining operations involve many operational risks, some of which could result in unforeseen interruptions to the Company's operations and substantial losses to the Company for which the Company may not be adequately insured.
The Company's operations, including drilling and completion activities and water distribution, collection and disposal activities, are subject to operatingall the risks that are often beyondincident to the Company's control,oil and gas development and production business, including:
blowouts, cratering, explosions and fires;
adverse weather effects;
environmental hazards, such risks may not be covered by insurance.as NGL and gas leaks, oil and produced water spills, pipeline and vessel ruptures, encountering naturally occurring radioactive materials ("NORM"), and unauthorized discharges of toxic chemicals, gases, brine, well stimulation and completion fluids or other pollutants onto the surface or into the subsurface environment;
Ownershiphigh costs, shortages or delivery delays of industrialequipment, labor or other services or materials, such as water and sand mining operations is subject to risks, manyfor hydraulic fracturing;
facility or equipment malfunctions, failures or accidents;
title problems;
pipe or cement failures or casing collapses;
uncontrollable flows of which are beyond the Company's control. These risks include:oil, gas or water;
compliance with environmental and other governmental requirements, including executive actions and regulatory or legislative efforts under a Biden administration;
lost or damaged oilfield workover and service tools;
surface access restrictions;
unusual or unexpected geological formations or pressures;
cave-ins, pit wall failurespressure or rock falls;
unanticipated ground, grade or water conditions;
inclement or hazardous weather conditions, including flooding, and the physical impacts of climate change;
environmental hazards, such as unauthorized spills, releases and discharges of wastes, vessel ruptures and emission of unpermitted levels of pollutants;
changesirregularities in laws and regulations;
inability to acquire or maintain necessary permits or mining or water rights;
restrictions on blasting operations;

formations;
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terrorism, vandalism and physical, electronic and cybersecurity breaches and global or national health concerns, including the outbreak of a pandemic or contagious disease, such as the recent COVID-19 pandemic; and
inabilitynatural disasters.
The Company's overall exposure to obtain necessary production equipment or replacement parts;
reductionoperational risks may increase as its drilling activity expands, along with any associated increases in the amount ofinternally-provided well services, water available for processing;
technical difficulties or failures;
labor disputes;
late delivery of supplies;
fires, explosionsdistribution, water collection, disposal or other accidents;services. In addition, any of these risks could adversely impact the Company's service providers and
facility interruptions suppliers, causing its supply chain to be interrupted, slowed or shutdowns in response to environmental regulatory actions.
rendered inoperable. Any of these risks could result in substantial losses to the Company due to injury or loss of life, damage to or destruction of the Company's mining properties orwells, production facilities personal injury, environmental damage, delays in mining or processing, losses or possible legal liability. Not allother property and natural resources, clean-up responsibilities, regulatory investigations and penalties and suspension of these risks are insurable, and the Company's insurance coverage contains limits, deductibles, exclusions and endorsements. operations.
The Company's insurance coverageCompany may not be sufficientinsured or is not fully insured against certain of the risks described above, either because such insurance is not available or because of the high premium costs and deductibles associated with obtaining such insurance. Additionally, the Company relies to meeta large extent on facilities owned and operated by third-parties, and damage to or destruction of those third-party facilities could adversely affect the ability of the Company to gather, produce, transport, process, fractionate, refine, store, export and sell its needshydrocarbons.
Exploration and development drilling involve substantial costs and risks and may not result in commercially productive reserves.
Drilling involves numerous risks, including the eventrisk that no commercially productive oil or gas reservoirs will be encountered. The cost of lossdrilling, completing and any such lossoperating wells is often uncertain and drilling operations may be curtailed, delayed or canceled, or become costlier, as a result of a variety of factors, including:
unexpected drilling conditions;
unexpected pressure or irregularities in formations;
equipment failures or accidents;
construction delays;
fracture stimulation accidents or failures;
adverse weather conditions;
restricted access to land for drilling or laying pipelines;
title defects;
lack of available gathering, transportation, processing, fractionation, storage, refining or export facilities;
lack of available capacity on interconnecting transmission pipelines;
access to, and the cost and availability of, the equipment, services, resources and personnel required to complete the Company's drilling, completion and operating activities; and
delays imposed by or resulting from compliance with or changes in environmental and other governmental, regulatory or contractual requirements.
The Company's future drilling activities may not be successful and, if unsuccessful, the Company's proved reserves and production would decline, which could have a materialan adverse effect on the Company.Company's future results of operations and financial condition. While all drilling, whether developmental, extension or exploratory, involves these risks, exploratory and extension drilling involves greater risks of dry holes or failure to find commercial quantities of hydrocarbons. The Company expects that it will continue to recognize exploration and abandonment expense in 2021.
Part of the Company's strategy involves using some of the latest available horizontal drilling and completion techniques, which involve risks and uncertainties in their application.
The Company's estimatesoperations involve utilizing some of sand reservesthe latest drilling and resource depositscompletion techniques as developed by it and its service providers. Risks that the Company faces while drilling horizontal wells include, but are imprecisenot limited to, the following:
landing the wellbore in the desired drilling zone;
staying in the desired drilling zone while drilling horizontally through the formation;
running casing the entire length of the wellbore; and actual reserves
being able to run tools and other equipment consistently through the horizontal wellbore.
Risks that the Company faces while completing wells include, but are not limited to, the following:
the ability to fracture stimulate the planned number of stages;
the ability to run tools the entire length of the wellbore during completion operations; and
the ability to successfully clean out the wellbore after completion of the final fracture stimulation stage.

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Drilling in emerging areas is more uncertain than drilling in areas that are more developed and have a longer history of established drilling operations. New discoveries and emerging formations have limited or no production history and, consequently, the Company is more limited in assessing future drilling results in these areas. If the Company's drilling results are worse than anticipated, the return on investment for a particular project may not be as attractive as anticipated and the Company may recognize noncash charges to reduce the carrying value of its unproved properties in those areas.
The Company's expectations for future drilling activities will be realized over several years, making them susceptible to uncertainties that could be less than estimated.materially alter the occurrence or timing of such activities.
The Company bases its sand reservehas identified drilling locations and resource estimates on engineering, economicprospects for future drilling opportunities, including development, exploratory, extension and geological data assembledinfill drilling activities. These drilling locations and analyzed by engineers and geologists, which are periodically reviewed by outside firms. However, commercial sand reserve estimates are necessarily imprecise and depend to some extent on statistical inferences drawn from availableprospects represent a significant part of the Company's future drilling data, which may prove unreliable. There are numerous uncertainties inherent in estimating quantities and qualitiesplans. For example, the Company's proved reserves as of commercial sandDecember 31, 2020 include proved undeveloped reserves and costsproved developed non-producing reserves of 31 MMBbls of oil, 17 MMBbls of NGL and 88 Bcf of gas. The Company's ability to mine recoverable reserves, including many factors beyond the Company's control. Estimates of economically recoverable commercial sand reserves necessarily dependdrill and develop these locations depends on a number of factors, and assumptions, all of which may vary considerably from actual results, such as:
geological and mining conditions or effects from prior mining that may not be fully identified by available data or that may differ from experience;
assumptions concerning future prices of commercial sand products, operating costs, mining technology improvements, development costs and reclamation costs; and
assumptions concerning future effects of regulation, including the issuanceavailability and cost of required permitscapital, regulatory approvals, negotiation of agreements with third parties, commodity prices, costs, access to and taxes by governmental agencies.
The Company's sand mining operations are subject to extensive environmental and occupational health and safety regulations that impose significant costs and potential liabilities.
The Company's sand mining operations are subject to a varietyavailability of federal, state and local environmental requirements affecting the mining and mineral processing industry, including, among others, those relating to employee health and safety, environmental permitting and licensing, air emissions and water discharges, GHG emissions, water pollution, waste management and disposal, remediation of soil and groundwater contamination, land use restrictions, reclamation and restoration of properties, wastes, hazardous substances and other regulated materials and natural resources. Some environmental laws impose substantial penalties for noncompliance, and others, such as the CERCLA, impose strict, retroactive and joint and several liability for the remediation of releases of hazardous substances. Failure to properly handle, transport, store or dispose of wastes, hazardous substances and other regulated materials or otherwise conduct the Company's sand mining operations in compliance with environmental laws could expose the Company to liability for governmental penalties, cleanup costs and civil or criminal liability associated with releases of such materials into the environment, damages to property or naturalequipment, services, resources and other damages, as well as potentially impair the Company's ability to conduct its sand mining operations. In addition, environmental lawspersonnel, and regulations are subject to amendment, replacement or re-interpretation by more stringent and comprehensive legal requirements. While the Company's environmental compliance costs with existing laws and regulations have not historically had a material adverse effect on its results of operations, theredrilling results. There can be no assurance that such coststhe Company will notdrill these locations or that the Company will be materialable to produce oil or gas reserves from these locations or any other potential drilling locations. Well results vary by formation and geographic area, and the Company generally prioritizes its drilling activities to focus on remaining locations that are believed to offer the highest return. Changes in the future. Moreover, such future compliance with existing, newlaws or amended lawsregulations on which the Company relies in planning and regulationsexecuting its drilling programs could restrictmaterially and adversely impact the Company's ability to expand its facilities or extract mineral deposits or could requiresuccessfully complete those programs. For example, under current Texas laws and regulations, the Company may receive permits to acquire costly equipmentdrill, and may drill and complete, certain horizontal wells that traverse one or more units and/or leases; a change in those laws or regulations could materially and adversely impact the Company's ability to incur other significant expensesdrill those wells. Because of these uncertainties, the Company cannot give any assurance as to the timing of these activities or that they will ultimately result in connection with its sand mining operations,the realization of proved reserves or meet the Company's expectations for success. As such, the Company's actual drilling activities may materially differ from the Company's current expectations, which restrictions or costs could have a material adverse effect on the Company's sand miningproved reserves, financial condition and results of operations.
Any failure byMulti-well pad drilling may result in volatility in the Company's operating results.
The Company to comply with applicable environmental lawsutilizes multi-well pad drilling, and regulationswells drilled on a pad are not placed on production until all wells on the pad are drilled and completed. In addition, problems affecting a single well could adversely affect production from all of the wells on the pad. As a result, multi-well pad drilling can cause delays in connection with its sand mining operationsthe scheduled commencement of production, or interruptions in ongoing production. These delays or interruptions may cause governmental authoritiesvolatility in the Company's operating results. Further, any delay, reduction or curtailment of the Company's development and producing operations due to take actions thatoperational delays caused by multi-well pad drilling could result in the loss of acreage through lease expiration.
The Company's operations are substantially dependent upon the availability of water and its ability to dispose of produced water gathered from drilling and production activities. Restrictions on the Company's ability to obtain water or dispose of produced water may have a material adverse effect on its financial condition, results of operations and cash flows.
Water is an essential component of the Company's drilling and hydraulic fracturing processes. Limitations or restrictions on the Company's ability to secure sufficient amounts of water (including limitations resulting from natural causes such as drought), could materially and adversely affectimpact its operations. Severe drought conditions can result in local water districts taking steps to restrict the use of water in their jurisdiction for drilling and hydraulic fracturing in order to protect the local water supply. If the Company including:is unable to obtain water to use in its operations from local sources, it may need to be obtained from new sources and transported to drilling sites, resulting in increased costs, which could have a material adverse effect on its financial condition, results of operations and cash flows.
issuanceIn addition, the Company must dispose of administrative, civilthe fluids produced from oil and criminal penalties;
denial, modification or revocation of permits or other authorizations;
imposition of injunctive obligations or other limitations on the Company'sgas production operations, including interruptionsproduced water, which it does directly or cessationthrough the use of operations;third party vendors. The legal requirements related to the disposal of produced water into a non-producing geologic formation by means of underground injection wells are subject to change based on concerns of the public or governmental authorities regarding such disposal activities. One such concern arises from seismic events near underground disposal wells that are used for the disposal of produced water resulting from oil and

gas activities. In 2016, the United States Geological Survey identified Texas as being among the states with areas of increased rates of induced seismicity that could be attributed to fluid injection or oil and gas extraction. While the agency has seen these rates decrease since that time, concern continues to exist over earthquakes arising from induced seismic activities. In response to concerns regarding induced seismicity, regulators in some states have imposed, or are considering imposing, additional requirements in the permitting of produced water disposal wells to assess any relationship between seismicity and the use of such wells. For example, in Texas, the Texas Railroad Commission has adopted rules governing the permitting or re-permitting
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requirementsof wells used to perform site investigatory, remedial or other corrective actions.
In addition to environmental regulation, the Company's sand mining operations are subject to laws and regulations relating to worker health and safety, including such matters as human exposure to crystalline silica dust. Several federal and state regulatory authorities, including the MSHA, may continue to propose changes in their regulations regarding workplace exposure to crystalline silica, such as permissible exposure limits and required controls and personal protective equipment.
The Company's sand mining operations are subject to the Federal Mine Safety and Health Actdispose of 1977 and amending legislation, which impose stringent health and safety standards on numerous aspects of the Company's sand mining operations.
The Company's sand mining operations are subject to the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006, which imposes stringent health and safety standards on numerous aspects of mineral extraction and processing operations, including the training of personnel, operating procedures, operating equipmentproduced water and other matters. This Act, as amended,fluids resulting from the production of oil and gas in order to address these seismic activity concerns within the state. Among other things, these rules require companies seeking permits for disposal wells to provide seismic activity data in permit applications, provide for more frequent monitoring and reporting for certain wells and allow the state to modify, suspend or terminate permits on grounds that a disposal well is a strict liability statutelikely to be, or determined to be, causing seismic activity.
States may issue orders to temporarily shut down or to curtail the injection depth of existing wells in the vicinity of seismic events. Another consequence of seismic events may be lawsuits alleging that disposal well operations have caused damage to neighboring properties or otherwise violated state and any failurefederal rules regulating waste disposal. These developments could result in additional regulation and restrictions on the use of injection wells by the Company or by commercial disposal well vendors whom the Company may use from time to comply with such existingtime to dispose of produced water. Increased regulation and attention given to induced seismicity could also lead to greater opposition, including litigation to limit or any future standards,prohibit oil and gas activities utilizing injection wells for produced water disposal. Any one or any more stringent interpretationof these developments may result in the Company or enforcement thereof,its vendors having to limit disposal well volumes, disposal rates and pressures or locations, or require the Company or its vendors to shut down or curtail the injection of produced water into disposal wells, which events could have a material adverse effect on the Company's sand miningbusiness, financial condition and results of operations.
The Company's use of seismic data is subject to interpretation and may not accurately identify the presence of oil and gas, which could materially and adversely affect the results of its drilling operations.
Even when properly used and interpreted, seismic data and visualization techniques are only tools used to assist geoscientists in identifying subsurface structures and hydrocarbon indicators and do not enable the interpreter to know whether hydrocarbons are, in fact, present in those structures. As a result, the Company's drilling activities may not be successful or economic. In addition, the use of advanced technologies, such as 3-D seismic data, requires greater pre-drilling expenditures than traditional drilling strategies, and the Company could incur losses as a result of such expenditures.
The Company's gas processing,gathering and treating operations are subject to operational and regulatory risks, which could result in significant damages and the loss of revenue.
As of December 31, 2020, the Company owns interests in 11 gas processing plants, including the related gathering systems. There are significant risks associated with the operation of gas processing plants and the associated gathering systems. Gas and NGLs are volatile and explosive and may include carcinogens. Damage to or otherwise imposeimproper operation of gas processing plants, gathering systems or treating facilities could result in an explosion or the discharge of toxic gases, which could result in significant restrictionsdamage claims in addition to interrupting a revenue source.
Moreover, while the Company's gas processing and gathering systems generally are not currently subject to FERC or state regulation with respect to rates or terms and conditions of service, there can be no assurance that such processing and gathering operations will continue to be unregulated in the future. Although these facilities may not be directly regulated, other laws and regulations may affect the availability of gas for gathering and processing, such as state regulations regarding production rates and the maximum daily production allowable from gas wells, which could impact the Company's business in these areas. Such regulation could result in additional costs and reduced revenues.
Financial risks.
The prices of oil, NGL and gas are highly volatile. A sustained decline in these commodity prices could materially and adversely affect the Company's business, financial condition and results of operations.
The Company's revenues, profitability, cash flow and future rate of growth are highly dependent on commodity prices. Commodity prices may fluctuate widely in response to relatively minor changes in the supply of and demand for oil, NGL and gas, market uncertainty and a variety of additional factors that are beyond the Company's control, such as:
domestic and worldwide supply of and demand for oil, NGL and gas;
worldwide oil, NGL and gas inventory levels, including at Cushing, Oklahoma, the benchmark location for WTI oil prices, and the U.S. Gulf Coast, where the majority of the U.S. refinery capacity exists;
volatility and trading patterns in the commodity-futures markets;
the capacity of U.S. and international refiners to utilize U.S. supplies of oil and condensate;
weather conditions;
overall domestic and global political and economic conditions, including the imposition of tariffs or trade or other economic sanctions, political instability or armed conflict in oil and gas producing regions;

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global or national health concerns, including the outbreak of pandemic or contagious disease, such as the recent coronavirus, which may reduce the demand for oil, NGL and gas because of reduced global or national economic activity;
actions of OPEC, its members and other state-controlled oil companies relating to oil price and production controls;
the price and quantity of oil, NGL and LNG imports to and exports from the U.S.;
technological advances or social attitudes or policies affecting energy consumption and energy supply;
domestic and foreign governmental legislative efforts, executive actions and regulations, including environmental regulations, climate change regulations and taxation;
the effect of energy conservation efforts;
stockholder activism or activities by non-governmental organizations to limit certain sources of capital for the energy sector or restrict the exploration, development and production of oil and gas;
the proximity, capacity, cost and availability of pipelines and other processing, fractionation, refinery, storage and export facilities; and
the price, availability and acceptance of alternative fuels.
Commodity prices have historically been, and continue to be, extremely volatile. For example, the Brent oil prices in 2020 ranged from a high of $68.91 to a low of $19.33 per Bbl and the NYMEX gas prices in 2020 ranged from a high of $3.35 to a low of $1.48 per MMBtu. The Company expects this volatility to continue. A further or extended decline in commodity prices could materially and adversely affect the Company's future business, financial condition, results of operations, liquidity or its ability to fund planned capital expenditures, pay dividends or repurchase shares of common stock. The Company makes price assumptions that are used for planning purposes, and a significant portion of the Company's cash outlays, including rent, salaries and noncancellable capital and transportation commitments, are largely fixed in nature. Accordingly, if commodity prices are below the expectations on which these commitments were based, the Company's financial results are likely to be adversely and disproportionately affected because these cash outlays are not variable in the short term and cannot be quickly reduced to respond to unanticipated decreases in commodity prices.
Significant or extended price declines could also materially and adversely affect the amount of oil, NGL and gas that the Company can produce economically, which may result in the Company having to make significant downward adjustments to its estimated proved reserves. A reduction in production could also result in a shortfall in expected cash flows and require the Company to reduce capital spending or borrow funds to cover any such shortfall. Any of these factors could negatively affect the Company's ability to conduct mineral extractionreplace its production and processingits future rate of growth.
Future declines in the price of oil, NGLs and gas could result in a reduction in the carrying value of the Company's proved oil and gas properties, which could materially and adversely affect the Company's results of operations.
Significant or extended price declines could result in the Company having to make downward adjustments to the carrying value of its proved oil and gas properties. The Company performs assessments of the recoverability of its oil and gas properties whenever events or circumstances indicate that the carrying values of those assets may not be recoverable. In order to perform these assessments, management uses various observable and unobservable inputs, including management's outlooks for (i) proved reserves and risk-adjusted probable and possible reserves, (ii) commodity prices, (iii) production costs, (iv) capital expenditures and (v) production. To the extent such tests indicate a reduction of the estimated useful life or estimated future cash flows of the Company's oil and gas properties, the carrying value may not be recoverable and therefore an impairment charge would be required to reduce the carrying value of the proved properties to their fair value. For example, during 2018, the Company recorded impairment charges of $77 million attributable to its Raton Basin field in southeast Colorado, primarily due to declines in commodity prices and downward adjustments to the economically recoverable reserves attributable to the asset. The Company may incur impairment charges in the future, which could materially affect the Company's results of operations in the period incurred. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations - Results of Operations - Impairment of oil and gas properties and other long-lived assets" and Note 4 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
The Company's sand mining operationsactual production could differ materially from its forecasts.
From time to time, the Company provides forecasts of expected quantities of future oil and gas production and other financial and operating results. These forecasts are subject to extensive governmental regulationsbased on a number of estimates and assumptions, including that impose significant costs and liabilities.
In addition tonone of the environmental and occupational health and safety regulation discussed above,risks associated with the Company's sand miningoil and gas operations summarized in this "Item 1A. Risk Factors" occur. Production forecasts, specifically, are also subject to extensivebased on assumptions such as:
expectations of production from existing wells and future drilling activity;
the absence of facility or equipment malfunctions;
the absence of adverse weather effects;

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expectations of commodity prices, which could experience significant volatility;
expected well costs; and
the assumed effects of regulation by governmental regulation on matters such as permitting and licensing requirements, reclamation and restorationagencies, which could make certain drilling activities or production uneconomical.
Should any of mining properties after mining is completed, and the effects that mining have on groundwater quality and availability. Also,these assumptions prove inaccurate, or should the Company's sand mining operations require numerous governmental, miningdevelopment plans change, actual production could be materially and other permitsadversely affected.
The Company could experience periods of higher costs if commodity prices rise. These increases could reduce the Company's profitability, cash flow and water rightsability to complete development activities as planned.
Historically, the Company's capital and approvals authorizing operations at each sand mining facility.
In order to obtain permits, renewalsoperating costs have risen during periods of permits or other approvals in the future for its sand mining operations, the Company may be required to prepareincreasing oil, NGL and present data to governmental authorities pertaining to the effect that any such activities may have on the environment. Obtaining or renewing required permits or approvals may be delayed or prevented due to opposition by neighboring property owners, membersgas prices. These cost increases result from a variety of the public or other third parties and other factors beyond the Company's control. Moreover, issuancecontrol, such as increases in the cost of any permits, permit renewalselectricity, steel and other raw materials that the Company and its vendors rely upon; increased demand for labor, services and materials as drilling activity increases; and increased production and ad valorem taxes. Decreased levels of drilling activity in the oil and gas industry have historically led to cost reductions for some drilling equipment, materials and supplies. However, such costs may rise faster than increases in the Company's revenue if commodity prices rise, thereby negatively impacting the Company's profitability, cash flow and ability to complete development activities as scheduled and on budget. This impact may be magnified to the extent that the Company's ability to participate in the commodity price increases is limited by its derivative risk management activities.
The Company is a party to debt instruments, a credit facility and other financial commitments that may limit the Company's ability to fund future business and financing activities.
The Company is a borrower under fixed rate senior and convertible notes and maintains a credit facility that was undrawn as of December 31, 2020. The terms of the Company's borrowings specify scheduled debt repayments and require the Company to comply with certain associated covenants and restrictions. The Company's ability to comply with the debt repayment terms, associated covenants and restrictions is dependent on, among other things, factors outside the Company's direct control, such as commodity prices and interest rates. In addition, from time to time, the Company enters into arrangements and transactions that can give rise to material off-balance sheet obligations, including firm purchase, transportation and fractionation commitments, gathering, processing, transportation and storage commitments on uncertain volumes of future throughput, commitments to purchase minimum volumes of goods and services, operating lease agreements and drilling commitments. The Company's financial commitments could have important consequences to its business including, but not limited to, the following:
the incurrence of charges associated with unused commitments if actual activities do not meet the Company's expectations at the time such commitments are entered into;
increasing its vulnerability to adverse economic and industry conditions;
limiting its flexibility to plan for, or react to, changes in its business and industry;
limiting its ability to fund future development activities or engage in future acquisitions; and
placing it at a competitive disadvantage compared to competitors that have less debt and/or fewer financial commitments.
The Company's ability to obtain additional financing is also affected by the Company's debt credit ratings and competition for available debt financing. A ratings downgrade could materially and adversely impact the Company's ability to access debt markets, increase the borrowing cost under the Company's credit facility and the cost of future debt and potentially require the Company to post letters of credit or other approvalsforms of credit support for certain obligations.
The Company's ability to declare and pay dividends and repurchase shares is subject to certain considerations.
Dividends are authorized and determined by governmental agenciesthe Company's board of directors in its sole discretion. The Company's stock repurchase program has no time limit, may be conditionedmodified, suspended or terminated at any time by the board of directors, and the repurchase of shares pursuant to the stock repurchase program approved by the board of directors are made from time to time based on newmanagement's discretion. Decisions regarding the payment of dividends and the repurchase of shares are subject to a number of considerations, including:
cash available for distribution or modified requirementsrepurchases;
the Company's results of operations and anticipated future results of operations;
the Company's financial condition, especially in relation to the anticipated future capital needs;
the level of cash reserves the Company may establish to fund future capital expenditures;
the Company's stock price; and

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other factors the board of directors deems relevant.
The Company can provide no assurance that it will continue to pay dividends or procedures with respectauthorize share repurchases at the current rate or at all. Any elimination of or downward revision in the Company's dividend payout or stock repurchase program could have a material adverse effect on the market price of the Company's common stock.
A failure by purchasers of the Company's production to mining that may be costly or time-consumingsatisfy their obligations to implement. A decision by a governmental agency or other third party to deny or delay issuing a new or renewed permit or approval, or to revoke or substantially modify an existing permit or approval,the Company could have a material adverse effect on the Company's sand miningresults of operation.
The Company relies on a limited number of purchasers to purchase a majority of its products. To the extent that purchasers of the Company's production rely on access to the credit or equity markets to fund their operations, atthere is a risk that those purchasers could default in their contractual obligations to the affected facility. CurrentCompany if such purchasers were unable to access the credit or future regulationsequity markets for an extended period of time. If for any reason the Company were to determine that it was probable that some or all of the accounts receivable from any one or more of the purchasers of the Company's production were uncollectible, the Company would recognize a charge in the earnings of that period for the probable loss.
The failure by counterparties to the Company's derivative risk management activities to perform their obligations could have a material adverse effect on the Company's sand miningresults of operations.
The use of derivative risk management transactions involves the risk that the counterparties will be unable to meet the financial terms of such transactions. The Company is unable to predict changes in a counterparty's creditworthiness or ability to perform. Even if the Company accurately predicts sudden changes, the Company's ability to negate the risk may be limited depending upon market conditions and the contractual terms of the transactions. During periods of declining commodity prices, the Company's derivative receivable positions generally increase, which increases the Company's counterparty credit exposure. If any of the Company's counterparties were to default on its obligations under the Company's derivative arrangements, such a default could (i) have a material adverse effect on the Company's results of operations, (ii) result in a larger percentage of the Company's future production being subject to commodity price changes and (iii) increase the likelihood that the Company's derivative arrangements may not achieve their intended strategic purposes.
The Company's derivative risk management activities could result in financial losses, limit the Company's potential gains or fail to protect the Company from declines in commodity prices; the Company may not enter into derivative arrangements with respect to future volumes if prices are unattractive.
The Company's strategy is to enter into derivative arrangements covering a portion of its oil, NGL and gas production to mitigate the effect of commodity price volatility on the Company's net cash provided by operating activities and its net asset value, support the Company's annual capital expenditure plans and planned dividend payments. In addition, Pioneer assumed existing derivative arrangements in the Parsley Acquisition, and they are now part of the Company's consolidated derivative arrangements. These derivative arrangements, on a combined basis, are subject to mark-to-market accounting treatment, and the changes in fair market value of the contracts are reported in the Company's statements of operations each quarter, which may result in significant noncash gains or losses.
While intended to reduce the effects of oil, NGL and gas price volatility, the Company's derivative arrangements may limit theCompany'spotentialgainsifpricesriseoverthepriceestablishedbysucharrangements.Conversely,theCompany's derivative arrangements may be inadequate to protect the Company from continuing and prolonged declines in the price of oil, NGL or gas. Global commodity prices are volatile. Such volatility challenges the Company's ability to forecast the price of oil, NGL and gas, and, as a result, it may become more difficult for the Company to manage its derivative arrangements. In trying to manage its exposure to commodity price risk, the Company may end up with too many or too few derivatives, depending upon where commodity prices settle relative to the Company's derivative price thresholds and how the Company's oil, NGL and gas volumes and production mix fluctuate relative to expectations when the derivatives were entered.
The Company's derivative arrangements may also expose the Company to risk of financial loss in certain circumstances, including, but not limited to, when:
production is less than the contracted derivative volumes;
the counterparty to the derivative contract defaults on its contract obligations;
there is a change in the expected differential between the underlying price in the derivative contract and actual prices received; or
a sudden, unexpected event materially impacts oil and gas prices.
Failure to protect against declines in commodity prices exposes the Company to reduced liquidity when prices decline. A sustained lower commodity price environment would result in lower realized prices for unprotected volumes and reduce the

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prices at which the Company could enter into derivative contracts on future volumes. This could make such transactions unattractive, and, as a result, some or all of the Company's production volumes forecasted for 2021 and beyond may not be protected by derivative arrangements. In addition, the Company's derivatives arrangements may not achieve their intended strategic purposes.
Pioneer's ability to utilize its historic U.S. net operating loss carryforwards and those of Parsley may be limited.
As of December 31, 2020, Pioneer and Parsley had U.S. federal net operating loss carryforwards ("NOLs") of $5.3 billion and $1.2 billion, respectively. Pioneer and Parsley NOLs of $2.8 billion and $611 million, respectively, were incurred prior to January 1, 2018 and will begin to expire, if unused, in 2032 and 2034, respectively, and $2.5 billion and $638 million, respectively, were incurred on or after January 1, 2018 and will not expire and will be carried forward indefinitely. Pioneer's ability to utilize these NOLs and other tax attributes to reduce future taxable income depends on many factors, including its future income, which cannot be assured. Section 382 of the Code ("Section 382") generally imposes an annual limitation on the amount of NOLs that may be used to offset taxable income when a corporation has undergone an "ownership change" (as determined under Section 382). An ownership change generally occurs if one or more stockholders (or groups of stockholders) who are each deemed to own at least five percent of such corporation's stock increase their ownership by more than 50 percentage points over their lowest ownership percentage within a rolling three-year period. In the event that an ownership change occurs, utilization of the relevant corporation's NOLs would be subject to an annual limitation under Section 382, generally determined, subject to certain adjustments, by multiplying (i) the fair market value of such corporation's stock at the time of the ownership change by (ii) a percentage approximately equivalent to the yield on long-term tax-exempt bonds during the month in which the ownership change occurs. Any unused annual limitation may be carried over to later years.
Parsley underwent an ownership change under Section 382 as a result of the Parsley Acquisition, which, based on information currently available, may trigger a limitation (calculated as described above) on Pioneer's ability to utilize any historic Parsley NOLs and could cause some of Parsley's NOLs incurred prior to January 1, 2018 to expire before Pioneer would be able to renewutilize them to reduce taxable income in future periods. While Pioneer's issuance of stock in the mergers would, standing alone, be insufficient to result in an ownership change with respect to Pioneer, the Company cannot assure that Pioneer will not undergo an ownership change as a result of the mergers taking into account other changes in ownership of Pioneer stock occurring within the relevant three-year period described above. If Pioneer were to undergo an ownership change, it may be prevented from fully utilizing its historic NOLs incurred prior to January 1, 2018.
The Company periodically evaluates its unproved oil and gas properties to determine recoverability of its cost and could be required to recognize noncash charges in the earnings of future periods.
At December 31, 2020, the Company carried unproved oil and gas property costs of $576 million. GAAP requires periodic evaluation of these costs on a project-by-project basis. These evaluations are affected by the results of exploration activities, commodity price outlooks, planned future sales or obtainexpiration of all or a portion of the leases and the contracts and permits appurtenant to such projects. If the quantity of potential reserves determined by such evaluations is not sufficient to fully recover the cost invested in each project, the Company will recognize noncash charges in the earnings in the period in which the unproved oil and gas properties is determined to be impaired.
The Company periodically evaluates its goodwill for impairment and could be required to recognize noncash charges in the earnings of future periods.
At December 31, 2020, the Company had a carrying value for goodwill of $261 million. Goodwill is assessed for impairment annually during the third quarter and whenever facts or circumstances indicate that the carrying value of the Company's goodwill may be impaired, which may require an estimate of the fair values of the reporting unit's assets and liabilities. Those assessments may be affected by (i) positive or negative reserve adjustments, (ii) results of drilling activities, (iii) management's outlook for commodity prices and costs and expenses, (iv) changes in the Company's market capitalization, (v) changes in the Company's weighted average cost of capital and (vi) changes in income taxes. If the fair value of the reporting unit's net assets is not sufficient to fully support the goodwill balance in the future, the Company will reduce the carrying value of goodwill for the impaired value, with a corresponding noncash charge to earnings in the period in which goodwill is determined to be impaired. If incurred, an impairment of the goodwill could result in a material noncash charge to the Company's earnings in the period in which goodwill is determined to be impaired.

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Health, safety and environmental risks.
The Company's operations are subject to a series of risks arising out of the threat of climate change that could result in increased operating costs, limit the areas in which oil and gas production may occur, and reduce demand for the oil and gas production it provides.
The threat of climate change continues to attract considerable attention in the United States and around the world. Numerous proposals have been made and could continue to be made at the international, national, regional and state levels of government to monitor and limit existing emissions of GHGs as well as to restrict or eliminate such future emissions.
No comprehensive climate change legislation has been implemented at the federal level, but President Biden may pursue new climate change legislation and has already issued executive orders and may issue more orders or other approvalsregulatory initiatives to limit GHG emissions. At the federal level, the EPA has adopted rules that, among other things, establish construction and operating permit reviews for GHG emissions from certain large stationary sources, require the monitoring and annual reporting of GHG emissions from certain petroleum and gas system sources, and impose new standards reducing methane emissions from oil and gas operations through limitations on venting and flaring and the implementation of enhanced emission leak detection and repair requirements. In recent years, there has been considerable uncertainty surrounding regulation of methane emissions, as the EPA under the Obama Administration published a CAA final rule in 2016 establishing new source performance standards ("NSPS") for methane, but since that time the EPA has undertaken several measures, including publishing in September 2020 final rule policy and technical amendments to the NSPS, for stationary sources of air emissions. The policy amendments, effective September 14, 2020, notably removed the transmission and storage sector from the regulated source category and rescinded methane and volatile organic compound ("VOC") requirements for the remaining sources that were established by former President Obama's Administration, whereas the technical amendments, effective November 16, 2020, included changes to fugitive emissions monitoring and repair schedules for gathering and boosting compressor stations and low-production wells, recordkeeping and reporting requirements, and more. Various state, industry and environmental groups are separately challenging both the original 2016 standards and the EPA's September 2020 final rules and on January 20, 2021, President Biden issued an executive order, that among other things, directed EPA to reconsider the technical amendments and to issue a proposed rule suspending, revising or rescinding those amendments by no later than September 2021. A reconsideration of the September 2020 policy amendments is expected to follow. The January 20, 2021 executive order also directed the establishment of new methane and VOC standards applicable to existing oil and gas operations, including the production, transmission, processing and storage segments.
Additionally, various states and groups of states have adopted or are considering adopting legislation, regulations or other regulatory initiatives that are focused on such areas as greenhouse gas cap and trade programs, carbon taxes, reporting and tracking programs, and restriction of emissions. At the international level, President Biden issued executive orders in January 2021 re-committing the United States to the "Paris Agreement," a non-binding agreement for nations to limit their GHG emissions through individually-determined reduction goals every five years after 2020, and directed the federal government to formulate the United States' emissions reduction goal under the agreement. Separately, on January 27, 2021, President Biden issued an executive order that commits to substantial action on climate change, calling for, among other things, the increased use of zero emissions vehicles by the federal government, the elimination of subsidies provided to the fossil fuel industry and an increased emphasis on climate-related risks across government agencies and economic sectors.
Litigation risks are also increasing, as a number of states, municipalities and other plaintiffs have sought to bring suit against the largest oil and gas exploration and production companies in state or federal court, alleging, among other things, that such energy companies created public nuisances by producing fuels that contributed to global warming effects, such as rising sea levels, and therefore, are responsible for roadway and infrastructure damages as a result, or alleging that the companies have been aware of the adverse effects of climate change for some time but defrauded their investors by failing to adequately disclose those impacts. There are also increasing financial risks for fossil fuel producers and other companies supportive of the oil and gas industry as shareholders and bondholders currently invested in fossil-fuel energy companies concerned about the potential effects of climate change may elect in the future.future to shift some or all of their investments into non-fossil fuel energy related sectors. Institutional lenders who provide financing to fossil-fuel energy companies also have become more attentive to sustainable lending and investment practices and some of them may elect not to provide funding for fossil fuel energy companies. Additionally, there is the possibility that financial institutions will be required to adopt policies that limit funding for fossil fuel energy companies, as President Biden recently signed an executive order calling for the development of a climate finance plan and, separately, the Federal Reserve announced that it has joined the Network for Greening the Financial System, a consortium of financial regulators focused on addressing climate-related risks in the financial sector.
Finally, increasing concentrations of GHG in the Earth's atmosphere may produce climate changes that have significant physical effects, such as increased frequency and severity of storms, droughts, floods, rising sea levels and other climatic events. The occurrence of any one or more of these developments with respect to climate change initiatives and further

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restrictions on GHG emissions could have a material adverse effect on the Company's business, financial condition and results of operations.
The nature of the Company's assets and production operations may impact the environment or cause environmental contamination, which could result in material liabilities to the Company.
The Company's assets and production operations may give rise to significant environmental costs and liabilities as a result of the Company's handling of petroleum hydrocarbons and wastes, because of air emissions and water discharges related to its operations, and due to past industry operations and waste disposal practices. The Company's oil and gas business involves the generation, handling, treatment, storage, transport and disposal of wastes, hazardous substances and petroleum hydrocarbons and is subject to environmental hazards, such as oil and produced water spills, NGL and gas leaks, pipeline and vessel ruptures and unauthorized discharges of such wastes, substances and hydrocarbons, that could expose the Company to substantial liability due to pollution and other environmental damage.
In recent years, wells used for the disposal by injection of flowback water or certain other oilfield fluids into non-producing formations have been associated with an increased number of seismic events, with research suggesting that the link between seismic events and wastewater disposal may vary by region and local geology. The U.S. geological survey has in the recent past identified six states with the most significant hazards from induced seismicity, which list included Texas. In response to these concerns, regulators in some states have adopted additional requirements related to seismicity and its potential association with hydraulic fracturing. For example, Texas has issued rules for wastewater disposal wells that imposed certain permitting and operating restrictions and reporting requirements on disposal wells in proximity to faults. Other states, such as Oklahoma, have also issued orders for certain wells where seismic incidents have occurred to restrict or suspend disposal well operations. Another consequence of seismic events may be lawsuits alleging that disposal well operations have caused damage to neighboring properties or otherwise violated state and federal rules regulating waste disposal. The occurrence of any one or more of these developments could have a material adverse effect on the Company's business, financial condition and results of operations.
The Company's hydraulic fracturing and former sand mining operations and hydraulic fracturing may result in silica-related health issues and litigation that could have a material adverse effect on the Company.
The Company routinely conducts hydraulic fracturing in its drilling and completion programs, which activity requires management and use of significant volumes of sand. Additionally, the Company owns and formerly operated certain sand mining operations. The inhalation of respirable crystalline silica dust is associated with the lung disease silicosis. There is evidence of an association between crystalline silica exposure or silicosis and lung cancer and a possible association with other diseases, including immune system disorders, such as scleroderma. These health risks have been, and may continue to be, a significant issue confronting the commercial sand industry. The actual or perceived health risks of mining, processing and handling sand could materially and adversely affect the Company through the threat of product liability or personal injury lawsuits, recently adopted OSHA silica regulations and increased scrutiny by federal, state and local regulatory authorities.
Pioneer Sands LLC ("Pioneer Sands"), the Company's wholly-owned sand mining subsidiary, is named The occurrence of significant silica-related health issues as a defendant, usually among many defendants, in numerous products liability lawsuits brought by or on behalf of current or former employees of Pioneer Sands or its commercial customers alleging damages caused by silica exposure. As of December 31, 2017, Pioneer Sands was the subject of silica exposure claims from 19 plaintiffs. Almost all of the claims pending against Pioneer Sands arise out of the alleged use of Pioneer Sands' sand products in foundries orwell as an abrasive blast media and have been filed in the states of Texas, Mississippi and Alabama, although some cases have been brought in other jurisdictions over the years.
It is possible that Pioneer Sands will have additional silica-related claims filed against it, including claims that allege silica exposure for periods for which there is not insurance coverage. In addition, it is possible that similar claims could be asserted arising out of the Company's other operations, including its hydraulic fracturing operations. Anyany pending or future claims or inadequacies of insurance coverage or contractual indemnification arising out of such issues could have a material adverse effect on the Company's results of operations.

Increasing attention to ESG matters may impact the Company's business.
Businesses across all industries are facing increasing scrutiny from stakeholders related to their ESG practices. Businesses that do not adapt to or comply with investor or stakeholder expectations and standards, which are evolving, or which are perceived to have not responded appropriately to the growing concern for ESG issues, regardless of whether there is a legal requirement to do so, may suffer from reputational damage and the business, financial condition, and/or stock price of such business entity could be materially and adversely affected. Increasing attention to climate change, increasing societal expectations on businesses to address climate change, and potential consumer use of substitutes to energy commodities may result in increased costs, reduced demand for the Company's hydrocarbon products, reduced profits, increased investigations and litigation, and negative impacts on its stock price and access to capital markets. Increasing attention to climate change, for example, may result in demand shifts for the Company's hydrocarbon products and additional governmental investigations and private litigation.
In addition, organizations that provide information to investors on corporate governance and related matters have developed ratings processes for evaluating business entities on their approach to ESG matters. Currently, there are no universal standards for such scores or ratings, but the importance of sustainability evaluations is becoming more broadly accepted by investors and shareholders. Such ratings are used by some investors to inform their investment and voting decisions. Additionally, certain investors use these scores to benchmark businesses against their peers and if a business entity is perceived as lagging, these investors may engage with such entities to require improved ESG disclosure or performance. Moreover,
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certain members of the broader investment community may consider a business entity's sustainability score as a reputational or other factor in making an investment decision. Consequently, a low sustainability score could result in exclusion of the Company's stock from consideration by certain investment funds, engagement by investors seeking to improve such scores and a negative perception of the Company's operations by certain investors.
Regulatory risks.
The Company's operations are subject to stringent environmental, oil and gas-related and occupational safety and health legal requirements that could increase its costs of doing business and result in additional operating restrictions, delays or cancellations in the completion of oil and gas wells, which could have a material adverse effect on the Company's business, results of operations and financial condition.
The Company's crude oil and gas exploration and production operations are subject to stringent federal, state and local legal requirements governing among other things, the drilling of wells, rates of production, the size and shape of drilling and spacing units or proration units, the transportation and sale of oil, NGLs and gas, the discharging of materials into the environment, environmental protection and occupational safety and health. These requirements may take the form of laws, regulations, and executive actions, and noncompliance with these legal requirements may subject the Company to sanctions, including administration, civil or criminal penalties, remedial cleanups or corrective actions, delays in permitting or performance of projects, natural resource damages and other liabilities.
In connection with its operations, the Company must obtain and maintain numerous environmental and oil and gas related permits, approvals and certificates from various federal, state and local governmental authorities, and may incur substantial costs in doing so. The need to obtain permits has the potential to delay, curtail or cease the development of oil and gas projects. The Company may in the future be charged royalties on gas emissions or required to incur certain capital expenditures for air pollution control equipment or other air emissions-related issues. For example, in 2015, the EPA under the Obama Administration issued a final rule under the CAA, making the National Ambient Air Quality Standard ("NAAQS") for ground-level ozone more stringent. Since that time, the EPA has issued area designations with respect to ground-level ozone and, more recently, in December 2020, the EPA, under the Trump Administration, published a final action that, upon conducting a periodic review of the ozone standard in accord with CAA requirements, elected to retain the 2015 ozone NAAQS without revision on a going-forward basis; however, several groups have filed litigation over this December decision, and the NAAQS may be subject to further revision under the Biden Administration. State implementation of the revised NAAQS could, among other things, require installation of new emission controls on some of the Company's equipment, result in longer permitting timelines, and significantly increase the Company's capital expenditures and operating costs.
In another example, in 2015, the EPA and U.S. Army Corps of Engineers ("Corps") under the Obama Administration released a final rule outlining federal jurisdictional reach under the CWA over waters of the United States; including wetlands; however, the 2015 rule was repealed by the EPA and the Corps under the Trump Administration in a final rule that became effective in December 2019. The EPA and the Corps also published a final rule in April 2020 re-defining the term "waters of the United States" as applied under the CWA and narrowed the scope of waters subject to federal regulation. The April 2020 final rule is subject to various pending legal challenges, and there is an expectation that this final rule will be reconsidered by the Biden Administration. If the EPA and the Corps revise the June 2020 final rule in a manner similar to or more stringent than the original 2015 final rule, or if any challenge to the June 2020 final rule is successful, the scope of the Clean Water Act's jurisdiction in areas where the Company conducts operations could again be expanded, which could result in increased costs and delay, restrict or halt permitting or development of projects.
Additionally, the Company's operations are subject to federal and state laws and regulations, including the federal OSHA and comparable state statutes, whose purpose is to protect the health and safety of employees. Among other things, the OSHA hazard communication standard, the EPA community right-to-know regulations under Title III of the federal Superfund Amendment and Reauthorization Act, and comparable state statutes require that information be maintained concerning hazardous materials used or produced in the Company's operations and that this information be provided to employees, state and local government authorities and citizens.
Compliance with these legal requirements, or any other new environmental or occupational safety and health laws, regulations or executive actions could, among other things, require the Company to install new or modified emission or safety controls on equipment or processes, incur longer permitting timelines, and incur increased capital or operating expenditures, which costs may be significant. Additionally, one or more of these developments could impact the Company's oil and gas exploration, production and development activities, which could have a material adverse effect on its business, results of operations and financial condition.

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ITEM 1B.UNRESOLVED STAFF COMMENTS
Laws, regulations and other executive actions or regulatory initiatives regarding hydraulic fracturing could increase the Company's cost of doing business and result in additional operating restrictions, delays or cancellations that could have a material adverse effect on the Company's business, results of operations and financial condition.
None.The Company routinely conducts hydraulic fracturing in its drilling and completion programs. Hydraulic fracturing is typically regulated by state oil and gas commissions, but the practice continues to attract considerable public, scientific and governmental attention in certain parts of the country, resulting in increased scrutiny and regulation, including by federal agencies.
At the federal level, the EPA asserted federal regulatory authority under the SDWA over certain hydraulic fracturing activities involving the use of diesel fuels and published permitting guidance for such activities. Additionally, the EPA issued a final regulation under the CWA prohibiting discharges to publicly owned treatment works of wastewater from onshore unconventional oil and gas extraction facilities. In late 2016, the EPA released its final report on the potential impacts of hydraulic fracturing on drinking water resources, concluding that "water cycle" activities associated with hydraulic fracturing may impact drinking water resources under certain circumstances. Also, in 2016, the BLM under the Obama Administration published a final rule imposing more stringent standards on hydraulic fracturing on federal lands; however, in late 2018, the BLM under the Trump Administration published a final rule rescinding the 2016 final rule. Since that time, litigation challenging the BLM's 2016 final rule and the 2018 final rule has resulted in rescission in federal courts of both the 2016 rule and the 2018 final rule but appeals of one or both of those decisions are expected.
Notwithstanding these regulatory developments, the Biden Administration has issued executive orders, could issue additional executive orders and could pursue other legislative and regulatory initiatives that restrict hydraulic fracturing activities on federal lands. For example, the Biden Administration issued an order on January 20, 2021 temporarily suspending the issuance of new leases and authorizations, including drilling permits on federal lands and waters for a period of 60 days, and subsequently issued a second order on January 27, 2021 suspending the issuance of new leases on federal lands and waters pending completion of a study of current oil and gas practices. Further constraints may be adopted by the Biden Administration in the future.
At the state level, many states have adopted legal requirements that have imposed new or more stringent permitting, public disclosure or well construction requirements on hydraulic fracturing activities, including in states where the Company's oil and gas exploration and production activities occur. States could also elect to place prohibitions on hydraulic fracturing and local governments may seek to adopt ordinances within their jurisdictions regulating the time, place or manner of drilling activities in general or hydraulic fracturing activities in particular.
Laws and regulations pertaining to protection of threatened and endangered species or to critical habitat, wetlands and natural resources could delay, restrict or prohibit the Company's operations and cause it to incur substantial costs that may have a material adverse effect on the Company's development and production of reserves.
The federal ESA and comparable state laws were established to protect endangered and threatened species. Under the ESA, if a species is listed as threatened or endangered, restrictions may be imposed on activities adversely affecting that species' habitat. Similar protections are offered to migratory birds under the Migratory Bird Treaty Act ("MBTA"). The U.S. Fish and Wildlife Service ("FWS"), during the Trump Administration, issued a final rule on January 7, 2021, which clarifies that criminal liability under the MBTA will apply only to actions "directed at" migratory birds, its nests, or its eggs; however, in 2020, the U.S. District Court for the Southern District of New York vacated a Department of Interior memorandum articulating a similar interpretation. The Company expects that the January 7 rulemaking will be subject to litigation or to reconsideration by the Biden Administration. Some of the Company's operations are conducted in areas where protected species or their habitats are known to exist. In these areas, the Company may be obligated to develop and implement plans to avoid potential adverse effects to protected species and their habitats, and the Company may be delayed, restricted or prohibited from conducting operations in certain locations or during certain seasons, such as breeding and nesting seasons, when the Company's operations could have an adverse effect on the species. In addition, the FWS may make new determinations on the listing of species as endangered or threatened under the ESA. The dunes sagebrush lizard is one example of a species that, if listed as endangered or threatened under the ESA in the future, could impact the Company's operations. The designation of previously unprotected species or the re-designation of under protected species as threatened or endangered in areas where the Company conducts operations could cause the Company to incur increased costs arising from species protection measures or could result in delays, restrictions or prohibitions on its development and production activities that could have a material adverse effect on the Company's ability to develop and produce reserves.

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ITEM 2.PROPERTIES
The Company's transportation of gas, sales and purchases of oil, NGLs and gas or other energy commodities, and any derivative activities related to such energy commodities, expose the Company to potential regulatory risks.
The FERC, the FTC and the CFTC hold statutory authority to monitor certain segments of the physical and futures energy commodities markets relevant to the Company's business. These agencies have imposed broad regulations prohibiting fraud and manipulation of such markets. With regard to the Company's transportation of gas in interstate commerce, physical sales and purchases of oil, NGL, gas or other energy commodities, and any derivative activities related to these energy commodities, the Company is required to observe the market-related regulations enforced by these agencies, which hold substantial enforcement authority. Failure to comply with such regulations, as interpreted and enforced, could result in agency actions that could materially and adversely affect the Company's results of operations and financial condition.
The enactment of derivatives legislation could have a material adverse effect on the Company's ability to use derivative instruments to reduce the effect of commodity price, interest rate and other risks associated with its business.
The Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Dodd-Frank Act") enacted in July 2010, established federal oversight and regulation of the over-the-counter derivatives market and entities, such as the Company, that participate in that market. The Dodd-Frank Act requires the CFTC and the SEC to promulgate rules and regulations for its implementation. While many Dodd-Frank Act regulations are already in effect, the rulemaking and implementation process is ongoing, and the ultimate effect of the adopted rules and regulations and any future rules and regulations on the Company's business remain uncertain.
In one of the rulemaking proceedings still pending under the Dodd-Frank Act, the CFTC issued in January 2020 (withdrawing previous proposals from 2013 and 2016), proposed rules imposing position limits for certain futures and options contracts in various commodities (including oil and gas) and for swaps that are their economic equivalents. Under the proposed rules on position limits, certain types of derivative transactions are exempt from these limits, provided that such derivative transactions satisfy the CFTC's requirements for certain enumerated "bona fide" derivative transactions. The CFTC has also adopted final rules regarding aggregation of positions, under which a party that controls the trading of, or owns ten percent or more of the equity interests in, another party will have to aggregate the positions of the controlled or owned party with its own positions for purposes of determining compliance with position limits unless an exemption applies. The CFTC's aggregation rules are now in effect, although CFTC staff has granted relief until August 12, 2022 from various conditions and requirements in the final aggregation rules. These rules may affect both the size of the positions that the Company may hold and the ability or willingness of counterparties to trade with the Company, potentially increasing the costs of transactions. Moreover, such changes could materially reduce the Company's access to derivative opportunities, which could adversely affect revenues or cash flow during periods of low commodity prices. As the new position limit rules are not yet final, the impact of those provisions on the Company is uncertain at this time.
The CFTC has designated certain interest rate swaps and credit default swaps for mandatory clearing and the associated rules also will require the Company, in connection with covered derivative activities, to comply with clearing and trade-execution requirements or to take steps to qualify for an exemption to such requirements. Although the Company believes it qualifies for the end-user exception from the mandatory clearing requirements for swaps entered to mitigate its commercial risks, the application of the mandatory clearing and trade execution requirements to other market participants, such as swap dealers, may change the cost and availability of the swaps that the Company uses. If the Company's swaps do not qualify for the commercial end-user exception, or if the cost of entering into uncleared swaps becomes prohibitive, the Company may be required to clear such transactions. The ultimate effect of these rules and any additional regulations on the Company's business is uncertain.
In addition, certain banking regulators and the CFTC have adopted final rules establishing minimum margin requirements for uncleared swaps. Although the Company expects to qualify for the end-user exception from margin requirements for swaps entered into to manage its commercial risks, the application of such requirements to other market participants, such as swap dealers, may change the cost and availability of the swaps that the Company uses. If any of the Company's swaps do not qualify for the commercial end-user exception, the posting of collateral could reduce its liquidity and cash available for capital expenditures and could reduce its ability to manage commodity price volatility and the volatility in its cash flows.
The full impact of the Dodd-Frank Act and related regulatory requirements upon the Company's business will not be known until the regulations are fully implemented and the market for derivatives contracts has adjusted. In addition, it is possible that the Biden administration could expand regulation of the over-the-counter derivatives market and the entities that participate in that market through either the Dodd-Frank Act or the enactment of new legislation. The Dodd-Frank Act (and any regulations implemented thereunder) and any new legislation could significantly increase the cost of derivative contracts, materially alter the terms of derivative contracts, reduce the availability of derivatives to protect against risks the Company

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encounters and reduce the Company's ability to monetize or restructure its existing derivative contracts. Further, the Dodd-Frank Act was intended, in part, to reduce the volatility of oil and gas prices, which some legislators attributed to speculative trading in derivatives and commodity instruments related to oil and gas. The Company's revenues could therefore be materially and adversely affected if a consequence of the Dodd-Frank Act and implementing regulations is to lower commodity prices.
The European Union and other non-U.S. jurisdictions are implementing regulations with respect to the derivatives market. To the extent the Company transacts with counterparties in foreign jurisdictions or counterparties with other businesses that subject them to regulations in foreign jurisdictions, the Company may become subject to, or otherwise affected by, such regulations. At this time, the impact of such regulations is not clear.
Regulation by the CFTC and banking regulators of the over-the-counter derivatives market and market participants could cause the Company's contract counterparties, which are generally financial institutions and other market participants, to curtail or cease their derivatives activities. The Company believes that these regulatory trends have contributed to a reduction in liquidity of the over-the-counter derivatives market, which could make it more difficult to engage in derivative transactions covering significant volumes of the Company's future production, and which could materially and adversely affect the cost and availability of derivatives to the Company. If the Company reduces its use of derivatives as a result of such regulation, the Company's results of operations may become more volatile and its cash flows may be less predictable, which could materially and adversely affect the Company's ability to plan for and fund capital expenditures. Any of these consequences could have a material adverse effect on the Company, its financial condition and its results of operations.
The Company's bylaws provide, to the fullest extent permitted by law, that the Court of Chancery of the State of Delaware (orif the Court of Chancery does not have jurisdiction, the federal district court for the District of Delaware) will be the exclusive forum for certain legal actions between the Company and its stockholders and that the federal district courts of the United States shall be the sole and exclusive forum for the resolution of causes of action arising under the Securities Act of 1933. These provisions could increase costs to bring a claim, discourage claims or limit the ability of the Company's stockholders to bring a claim in a judicial forum viewed by the stockholders as more favorable for disputes with the Company or the Company's directors, officers or other employees.
The Company's bylaws provide to the fullest extent permitted by law that, unless the Company consents in writing to the selection of an alternative forum, the Court of Chancery of the State of Delaware (or if the Court of Chancery does not have jurisdiction, the federal district court for the District of Delaware) will be the sole and exclusive forum for (a) any derivative action or proceeding brought on behalf of the Company, (b) any action asserting a claim of breach of a fiduciary duty owed by any director, officer, other employee or agent or stockholder of the Company to the Company or the Company's stockholders, (c) any action against the Company arising pursuant to any provision of the Delaware General Corporation Law or as to which the Delaware General Corporation Law confers jurisdiction on the Court of Chancery of the State of Delaware, or (d) any action against the Company or any director, officer, other employee or agent of the Company asserting a claim governed by the internal affairs doctrine, including, without limitation, any action to interpret, apply, enforce or determine the validity of the Company's certificate of incorporation or the Company's bylaws. The Company's bylaws also provided that the federal district courts of the United States shall be the sole and exclusive forum for the resolution of any complaint asserting a cause of action arising under the Securities Act of 1933. Although the Company's bylaws provide for an exclusive forum for causes of action under the Securities Act of 1933, its stockholders will not be deemed to have waived compliance with the federal securities laws and the rules and regulations thereunder. The choice of forum provisions may increase costs to bring a claim, discourage claims or limit a stockholder's ability to bring a claim in a judicial forum that it finds favorable for disputes with the Company or the Company's directors, officers or other employees, which may discourage such lawsuits against the Company or the Company's directors, officers and other employees. Alternatively, if a court were to find the choice of forum provision contained in the Company's bylaws to be inapplicable or unenforceable in an action, the Company may incur additional costs associated with resolving such action in other jurisdictions.
Risks associated with the Parsley Acquisition.
The financial and operational synergies attributable to the Parsley Acquisition may vary from expectations.
Pioneer may fail to realize the anticipated benefits and synergies expected from the Parsley Acquisition, which could adversely affect its business, financial condition and operating results. The success of the Parsley Acquisition will depend, in significant part, on Pioneer's ability to successfully integrate the acquired business and realize the anticipated strategic benefits and synergies from the combination. Pioneer believes that the addition of Parsley will complement Pioneer's strategy by providing operational and financial scale, increasing free cash flow and enhancing Pioneer's corporate rate of return. However, achieving these goals requires, among other things, realization of the targeted cost synergies expected from the Parsley Acquisition. The anticipated benefits of the transaction may not be realized fully or at all, or may take longer to realize than expected. Actual operating, technological, strategic and revenue opportunities, if achieved at all, may be less significant than

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expected or may take longer to achieve than anticipated. If Pioneer is not able to achieve these objectives and realize the anticipated benefits and synergies expected from the Parsley Acquisition within the anticipated timing or at all, Pioneer's business, financial condition and operating results may be adversely affected.
Litigation relating to the Parsley Acquisition could result in substantial costs to the Company.
Securities class action lawsuits and derivative lawsuits are often brought against public companies that have entered into acquisition, merger or other business combination agreements. Even if such a lawsuit is without merit, defending against these claims can result in substantial costs and divert the time and resources of management. An adverse judgment could result in monetary damages, which could have a negative impact on the Company's liquidity and financial condition.
The Company, subsidiaries, or persons that have indemnification rights against the Company or its subsidiaries have been sued in connection with the Parsley Acquisition. There can be no assurance that the Company and the other defendants will be successful in the outcome of any such pending or any potential future lawsuits. The defense or settlement of any of these pending or future lawsuits may adversely affect the Company's business, liquidity, financial condition and results of operations.
The Company may be unable to integrate the business of Parsley successfully and/or realize the anticipated benefits of the Parsley Acquisition.
The Parsley Acquisition involves the combination of two companies that operated as independent public companies. The combination of two independent businesses is complex, costly and time consuming, and the Company will be required to devote significant management attention and resources to integrating Parsley's business practices and operations with those of the Company. Potential difficulties that the Company may encounter as part of the integration process include the following:
the inability to successfully combine the business of Parsley in a manner that permits the Company to achieve, on a timely basis or at all, the enhanced revenue opportunities, cost savings and other benefits anticipated to result from the Parsley Acquisition;
complexities associated with managing the combined businesses, including difficulty addressing possible differences in operational philosophies and the challenge of integrating complex systems, technology, networks and other assets of each of the companies in a seamless manner that minimizes any adverse impact on the customers, suppliers, employees and other constituencies;
the assumption of contractual obligations with less favorable or more restrictive terms;
potential unknown liabilities and unforeseen increased expenses associated with the Parsley Acquisition;
diversion of the attention of the Company's management; and
the disruption of, or the loss of momentum in, the Company's ongoing business or inconsistencies in standards, controls, procedures and policies.
Any of these issues could adversely affect the Company's ability to maintain relationships with customers, suppliers, employees and other constituencies or achieve the anticipated benefits of the Parsley Acquisition, or could reduce the Company's earnings or otherwise adversely affect the Company's business and financial results.
The Company's future results will suffer if it does not effectively manage its expanded operations.
As a result of the Parsley Acquisition, the size and geographic footprint of the Company's business has increased. The Company's future success will depend, in part, upon its ability to manage this expanded business, which may pose substantial challenges for management, including challenges related to the management and monitoring of new operations and basins and associated increased costs and complexity. The Company may also face increased scrutiny from governmental authorities as a result of the increase in the size of its business. There can be no assurances that the Company will be successful or that it will realize the expected operating efficiencies, cost savings, revenue enhancements or other benefits currently anticipated from the Parsley Acquisition.
ITEM 1B.    UNRESOLVED STAFF COMMENTS
None.

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ITEM 2.PROPERTIES
Reserve Estimation Procedures and Audits
The information included in this Report about the Company's proved reserves as of December 31, 2017, 20162020, 2019 and 20152018 is based on evaluations prepared by the Company's engineers and audited by Netherland, Sewell & Associates, Inc. ("NSAI"), with respect to the Company's major properties. The Company has no oil and gas reserves from non-traditional sources. Additionally, the Company does not provide optional disclosure of probable or possible reserves..
Reserve estimation procedures. The Company has established internal controls over reserve estimation processes and procedures to support the accurate and timely preparation and disclosure of reserve estimates in accordance with SEC requirements. These controls include oversight of the reserves estimation reporting processes by Pioneer's Corporate Reserves Group ("Corporate Reserves"), and annual external audits of substantial portions of the Company's proved reserves by NSAI.
Corporate Reserves is responsible for the management of the oil and gas proved reserve estimation processes in each of the Company's Permian Basin, South Texas, Raton and West Panhandle asset areas. Corporate Reserves is staffed with reservoir engineers and geoscientists who prepare reserve estimates at the end of each calendar quarter for the assets that they manage, using reservoir engineering information technology. Corporate Reserves interacts with the exploration and production functions to ensure all available engineering and geologic data is taken into account prior to establishing or revising an estimate. There is oversight of the reservoir engineers by the Director of Corporate Reserves and the Vice President of Corporate Reserves, each of whomwho is in turn subject to direct or indirect oversight by the Company's management committee ("MC"). The Company's MC which is comprised of its Chief Executive Officer, Chief Operating Officer, Chief Financial Officer and other executive officers. The reserve estimates are prepared by reservoir engineers before being submitted to the Director and Vice President of Corporate Reserves for further review.
The reserve estimates are summarized in reserve reconciliations that quantify reserve changes since the previous year end as revisions of previous estimates, purchases of minerals-in-place, improved recovery, extensions and discoveries, production and

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PIONEER NATURAL RESOURCES COMPANY

sales of minerals-in-place. All reserve estimates, material assumptions and inputs used in reserve estimates and significant changes in reserve estimates are reviewed for engineering and financial appropriateness and compliance with SEC rules and GAAP standards by Corporate Reserves, in consultation with the Company's accounting and financial management personnel.U.S. GAAP. Annually, the MC reviews the reserve estimates, and any differences with the reserve auditors (forNSAI for the portion of the reserves audited by NSAI) on a consolidated basisthat it audits, before these estimates are approved. The engineers and geoscientists who participate in the reserve estimation and disclosure process periodically attend training provided by external consultants and through internal Pioneer programs. Additionally, Corporate Reserves has prepared and maintains written policies and guidelines for its staff to reference on reserve estimation and preparation to promote consistency in the preparation of the Company's reserve estimates and compliance with the SEC reserve estimation and reporting rules.
Proved reserves audits. The proved reserve audits performedreserves audited by NSAI, forin aggregate, represented the following:
As of December 31,
202020192018
Proved reserves audited by NSAI89 %83 %79 %
Pre-tax present value of proved reserves discounted at ten percent audited by NSAI100 %99 %95 %
In connection with the annual reserves audit, NSAI prepared its own estimates of the Company's proved reserves and compared its estimates to those prepared by the Company. NSAI determined that the Company's estimates of reserves were prepared in accordance with the definitions and regulations of the SEC, including the criteria of "reasonable certainty," as it pertains to expectations about the recoverability of reserves in future years, endedunder existing economic and operating conditions, consistent with the definition in Rule 4-10(a)(24) of Regulation S-X. NSAI issued an unqualified audit opinion on the Company's proved reserves at December 31, 2017, 20162020, 2019 and 2015,2018, respectively, based upon their evaluation. NSAI concluded that the Company's estimates of proved reserves were, in the aggregate, represented 77 percent, 77 percent and 82 percent of the Company's year-end 2017, 2016 and 2015 proved reserves, respectively; and 91 percent, 93 percent and 97 percent of the Company's year-end 2017, 2016 and 2015 associated pre-tax present value of proved reserves discounted at ten percent, respectively.
NSAI follows the general principles set forth in the "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserve Information" promulgated by the Society of Petroleum Engineers (the "SPE"). A reserve audit as defined by the SPE is not the same as a financial audit. The SPE's definition of a reserve audit includes the following concepts:
A reserve audit is an examination of reserve information that is conducted for the purpose of expressing an opinion as to whether such reserve information, in the aggregate, is reasonable and hashad been presentedprepared in conformityaccordance with the 2007 SPE publication entitled "StandardsStandards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information."
The estimation of reserves is an imprecise science due to the many unknown geologic and reservoir factors that cannot be estimated through sampling techniques. Since reserves are only estimates, they cannot be audited for the purpose of verifying exactness. Instead, reserve information is audited for the purpose of reviewing in sufficient detail the policies, procedures and methods used by a company in estimating its reserves so that the reserve auditors may express an opinion as to whether, in the aggregate, the reserve information furnished by a company is reasonable.
The methods and procedures used by a company, and the reserve information furnished by a company, must be reviewed in sufficient detail to permit the reserve auditor, in its professional judgment, to express an opinion as to the reasonableness of the reserve information. The auditing procedures require the reserve auditor to prepare their own estimates of reserve information for the audited properties.
In conjunction with the audit of the Company's proved reserves and associated pre-tax present value discounted at ten percent, Pioneer provided to NSAI its external and internal engineering and geoscience technical data and analyses. Following NSAI's review of that data, it had the option of honoring Pioneer's interpretations, or making its own interpretations. No data was withheld from NSAI. NSAI accepted without independent verification the accuracy and completeness of the historical information and data furnished by Pioneer with respect to ownership interest, oil and gas production, well test data, commodity prices, operating and development costs, and any agreements relating to current and future operations of the properties and sales of production. However, if in the course of its evaluations something came to its attention that brought into question the validity or sufficiency of any such information or data, NSAI did not rely on such information or data until it had satisfactorily resolved its questions relating thereto or had independently verified such information or data.
In the course of its evaluations, NSAI prepared, for all of the audited properties, its own estimates of the Company's proved reserves and the pre-tax present values of such reserves discounted at ten percent. NSAI reviewed its audit differences with the Company, and, in a number of cases, held meetings with the Company to review additional reserves work performed by the Company's technical teams and any updated performance data related to the proved reserve differences. Such data was incorporated, as appropriate, by both parties into the proved reserve estimates. NSAI's estimates, including any adjustments resulting from additional data, of those proved reserves and the pre-tax present value of such reserves discounted at ten percent did not differ from Pioneer's estimates by more than ten percent in the aggregate. However, when compared on a lease-by-lease, field-by-field or area-by-area basis, some of the Company's estimates were greater than those of the reserve auditors and some were less than the estimates of the reserve auditors. When such differences do not exceed ten percent in the aggregate and NSAI is satisfied that the proved reserves and pre-tax present values of such reserves discounted at ten percent are reasonable and that its audit objectives have been met, NSAI will issue an unqualified audit opinion. Remaining differences are not resolved due to the limited cost benefit of continuing such analyses by the Company and the reserve auditors. At the conclusion of the audit process, it was NSAI's opinion, as set forth in its audit letter, which is included as an exhibit to this Report, that Pioneer's estimates of the Company's proved oil and gas reserves and associated pre-tax present values discounted at ten percent are, in the aggregate, reasonable and have been

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PIONEER NATURAL RESOURCES COMPANY

prepared in accordance with the "Standards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information"Information promulgated by the SPE.Society of Petroleum Engineers. NSAI's report as of December 31, 2020, which should be read in its entirety, is attached as Exhibit 99.1 to this Annual Report on Form 10-K.
See "Item 1A. Risk Factors," "Critical Accounting Estimates" in "Item 7. Management's Discussion and Analysis and Results of Operations" and "Item 8. Financial Statements and Supplementary Data" for additional discussions regarding proved reserves and their related cash flows.
Qualifications of proved reserves preparers and auditors. Corporate Reserves is staffed by petroleum engineers with extensive industry experience and is managed by the Vice PresidentDirector of Corporate Reserves, the technical person who is primarily responsible for overseeing the Company's reserves estimates. These individuals meet the professional qualifications of reserves estimators and reserves auditors as defined by the "StandardsStandards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information," promulgated by the SPE.Information. The qualifications of the Vice PresidentDirector of Corporate Reserves include 4041 years of international and domestic experience as a petroleum engineer, with 3323 years focused on reserves reporting for independent oil and gas companies, including Pioneer. He has an additional 19 years of Permian Basin-focused production engineering, advanced reservoir engineering, petrophysics, consulting and special project research experience with major oil companies. His educational background includes an undergraduate degree in ChemicalGeological Engineering andwith a Masters of Business Administration degree in Finance. He is also a Chartered Financial Analyst Charterholder.Petroleum Engineering emphasis.
NSAI provides worldwide petroleum property analysis services for energy clients, financial organizations and government agencies. NSAI was founded in 1961 and performs consulting petroleum engineering services under Texas Board of Professional Engineers Registration No. F-2699. The technical person primarily responsible for auditing the Company's reserves estimates has been a practicing consulting petroleum engineer at NSAI since 19831998 and has over 3940 years of practical experience in petroleum engineering, including over 3635 years of experience in the estimation and evaluation of proved reserves.

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He graduated with a Bachelor of Science degree in ChemicalPetroleum Engineering in 19781980 and meets or exceeds the education, training and experience requirements set forth in the "StandardsStandards Pertaining to the Estimating and Auditing of Oil and Gas Reserves Information" promulgated by the board of directors of the SPE.Information.
Technologies used in proved reserves estimates. Proved undeveloped reserves include those reserves that are expected to be recovered from new wells on undrilled acreage, or from existing wells where a relatively major expenditure is required for completion. Undeveloped reserves may be classified as proved reserves on undrilled acreage directly offsetting development areas that are reasonably certain of production when drilled, or where reliable technology provides reasonable certainty of economic producibility. Undrilled locations may be classified as having undeveloped proved reserves only if an ability and intent has been established to drill the reserves within five years, unless specific circumstances justify a longer time period.
In the context of reserves estimations, reasonable certainty means a high degree of confidence that the quantities will be recovered and reliable technology means a grouping of one or more technologies (including computational methods) that has been field-tested and has been demonstrated to provide reasonable certaincertainty that the results with consistencywill be consistent and repeatabilityrepeatable in the formation being evaluated or in an analogous formation. In estimating proved reserves, the Company uses several different traditional methods such as performance-based methods, volumetric-based methods and analogy with similar properties. In addition, the Company utilizes additional technical analysis such as seismic interpretation, wireline formation tests, geophysical logs and core data to provide incremental support for more complex reservoirs. Information from this incremental support is combined with the traditional technologies outlined above to enhance the certainty of the Company's proved reserve estimates.

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PIONEER NATURAL RESOURCES COMPANY

Proved Reserves
As of December 31, 2017, 2016 and 2015, theThe Company's oil and gas proved reserves are located entirely inas follows:
Proved Reserve Volumes
 Oil
(MBbls)
NGLs
(MBbls)
Gas
(MMcf) (a)
Total (MBOE)%
As of December 31, 2020:
Developed539,320 362,584 1,855,607 1,211,172 95 %
Undeveloped29,464 16,603 84,493 60,149 %
Total proved reserves568,784 379,187 1,940,100 1,271,321 100 %
As of December 31, 2019:
Developed571,293 268,468 1,429,417 1,077,997 95 %
Undeveloped32,457 13,515 70,096 57,655 %
Total proved reserves603,750 281,983 1,499,513 1,135,652 100 %
As of December 31, 2018:
Developed521,579 219,730 1,330,852 963,118 92 %
Undeveloped43,431 21,184 127,722 85,902 %
Total proved reserves565,010 240,914 1,458,574 1,049,020 100 %
 _____________________
(a)Total proved gas reserves include 115,239 MMcf, 100,236 MMcf and 106,948 MMcf of gas that the United States. Company expected to be produced and used as field fuel (primarily for compressors) as of December 31, 2020, 2019 and 2018, respectively.
The Company's Standardized Measure of total proved reserves are as follows:
 As of December 31,
 202020192018
 (in millions)
Proved developed reserves$6,992 $9,386 $10,694 
Proved undeveloped reserves210 348 639 
$7,202 $9,734 $11,333 

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The NYMEX prices used for oil and gas reserve preparation, based upon SEC guidelines, were as follows:
Year Ended December 31,
202020192018
Oil per Bbl$39.57 $55.93 $65.57 
Gas per Mcf$1.98 $2.58 $3.10 
See Note C of Notes to Consolidated Financial Statements"Unaudited Supplementary Information" included in "Item 8. Financial Statements and Supplementary Data" for additional details of the Company's discontinued operations. The following table provides information regarding the Company's proved reserves as of December 31, 2017, 2016 and 2015:information.
 
Summary of Oil and Gas Proved Reserves as of Fiscal Year-End
Based on Average Fiscal-Year Prices
 Proved Reserve Volumes
 Oil
(MBbls)
 NGLs
(MBbls)
 Gas
(MMcf) (a)
 Total (MBOE) %
December 31, 2017:         
Developed442,364
 189,434
 1,629,451
 903,373
 92%
Undeveloped40,525
 21,063
 122,429
 81,993
 8%
Total proved reserves482,889
 210,497
 1,751,880
 985,366
 100%
          
December 31, 2016:         
Developed343,515
 126,928
 1,215,861
 673,085
 93%
Undeveloped34,681
 10,013
 48,868
 52,840
 7%
Total proved reserves378,196
 136,941
 1,264,729
 725,925
 100%
          
December 31, 2015:         
Developed266,657
 112,376
 1,284,680
 593,146
 89%
Undeveloped45,313
 13,968
 71,807
 71,249
 11%
Total proved reserves311,970
 126,344
 1,356,487
 664,395
 100%
 _____________________
(a)Total proved gas reserves contain 171,623 MMcf, 137,853 MMcf and 144,955 MMcf of gas that the Company expected to be produced and used as field fuel (primarily for compressors), rather than being delivered to a sales point as of December 31, 2017, 2016 and 2015, respectively.
The Company's Standardized Measure of total proved reserves as of December 31, 2017 was $8.2 billion, including $7.7 billion and $443 million related to proved developed and proved undeveloped reserves, respectively. The Standardized Measure of total proved reserves as of December 31, 2017 includes the reduction of the federal corporate income tax rate to 21 percent associated with the enactment of the Tax Cut and Jobs Act. The Company's Standardized Measure of total proved reserves as of December 31, 2016 was $4.2 billion, including $4.0 billion and $178 million related to proved developed and proved undeveloped reserves, respectively. The Company's Standardized Measure of total proved reserves as of December 31, 2015 was $3.2 billion, including $3.0 billion and $245 million related to proved developed and proved undeveloped reserves, respectively.
See the "Unaudited Supplementary Information" section included in "Item 8. Financial Statements and Supplementary Data" for additional details of the estimated quantities of the Company's proved reserves, including explanations for material changes in proved developed and proved undeveloped reserves.

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PIONEER NATURAL RESOURCES COMPANY

Description of Properties
The following tables summarize the Company's developmentDevelopment and exploration/exploratory/extension drilling activities during 2017:activity is as follows:
Year Ended December 31, 2020
DevelopmentExploratory/Extension
Beginning wells in progress234 
Wells spud17 218 
Less:
Successful wells13 242 
Ending wells in progress210 
 Development Drilling
 
Beginning
Wells In Progress
 
Wells
Spud
 
Successful
Wells
 
Ending
Wells In
Progress
Permian Basin8
 22
 16
 14
South Texas—Eagle Ford Shale4
 1
 5
 
South Texas—Other
 5
 5
 
Total12
 28
 26
 14
 Exploration/Extension Drilling
 Beginning
Wells In Progress
 
Wells
Spud
 
Successful
Wells
 
Unsuccessful
Wells
 
Ending
Wells In
Progress
Permian Basin119
 214
 207
 1
 125
South Texas—Eagle Ford Shale14
 10
 15
 1
 8
West Panhandle
 3
 
 
 3
Total133
 227
 222
 2
 136
The following table summarizes the Company's averageAverage daily oil, NGL,NGLs, gas and total production by asset area during 2017:is as follows:
 Oil (Bbls) NGLs (Bbls) Gas (Mcf) (a) Total (BOE)
Permian Basin147,641
 44,099
 194,904
 224,224
South Texas—Eagle Ford Shale7,754
 7,141
 44,039
 22,235
Raton Basin
 
 88,497
 14,750
West Panhandle1,669
 3,490
 7,484
 6,407
South Texas—Other1,502
 277
 17,531
 4,700
Other5
 1
 52
 14
Total158,571
 55,008
 352,507
 272,330
_____________________
(a)Year Ended December 31, 2020
Oil (Bbls)210,641 
NGL (Bbls)85,728 
Gas production excludes gas produced and used as field fuel.(Mcf) (a)425,307 
Total (BOE)367,253 

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PIONEER NATURAL RESOURCES COMPANY
(a)Gas production excludes gas produced and used as field fuel.

Costs incurred is as follows:
The following table summarizes the Company's costs incurred by asset area during 2017:
Year Ended December 31, 2020
(in millions)
Property acquisition costs:
Unproved$14 
Exploration costs1,167 
Development costs280 
Asset retirement obligations112 
$1,573 
 
Property
Acquisition Costs
 Exploration Costs Development Costs 
Asset
Retirement Obligations
  
 Proved Unproved    Total
 (in millions)
Permian Basin$8
 $128
 $1,950
 $579
 $(17) $2,648
South Texas—Eagle Ford Shale
 
 74
 37
 (4) 107
Raton Basin
 
 1
 6
 5
 12
West Panhandle
 
 2
 10
 (4) 8
South Texas—Other
 
 
 15
 3
 18
Other
 
 4
 
 
 4
Total$8
 $128
 $2,031
 $647
 $(17) $2,797
Permian Basin. In November 2016, the U.S. Geological Survey ("USGS") announced, based on its estimates, that the Wolfcamp shale in the Permian Basin is the largest continuous oil field in the United States.With approximately 755,000 gross acres (680,000 net acres), Pioneer is the largest acreage holder in the Spraberry/Wolfcamp field with approximately 750,000 gross acres (660,000 net acres).in the Permian Basin of West Texas. Pioneer's interests in the northern portion of the play comprise approximately 550,000560,000 gross acres and its interests in the southern portion of the play, where the Company has a joint venture with Sinochem, comprise approximately 200,000 gross acres. The January 12, 2021 Parsley Acquisition added approximately 290,000 gross acres to the Company's acreage position in the Permian Basin, of which approximately 190,000 gross acres are in the Midland Basin and approximately 100,000 gross acres are in the Delaware Basin. The oil produced from the Spraberry/Wolfcamp fieldPermian Basin is West Texas Intermediate Sweet, and the gas produced is casinghead gas with an average energy content of 1,400 Btu. The oil and gas are produced primarily from seven formations, the upper and lower Spraberry, the Jo Mill, the Dean, the Wolfcamp, Bone Spring, the Strawn and the Atoka, at depths ranging from 7,500 feet to 14,000 feet. The Company believes that it has significant resource potential within its Spraberry, Jo Mill, Wolfcamp and WolfcampBone Spring formation acreage, based on itsthe Company and Parsley's extensive geologic data covering the Middle Spraberry, Jo Mill and Lower Spraberry intervals, the Wolfcamp A, B, C and D intervals and itsthe Bone Spring intervals and both the Company and Parsley's drilling results to date.

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During 2017,2020, the Company successfully completed 183206 horizontal wells in the northern portion of the play andwhere approximately 40 horizontal wells in the southern portion of the play. In the northern portion of the play, approximately 50 percent of the horizontal wells placed on production were Wolfcamp BA interval wells, approximately 3530 percent were Wolfcamp AB interval wells and approximately 1530 percent were Lower Spraberry Shaleand Wolfcamp D interval wells. TheAdditionally, the Company successfully completed 49 horizontal wells in the southern portion of the play where the majority of the wells placed on production in the southern portion of the play were Wolfcamp B interval wells. In addition, during 2017, the
The Company completedcontinues to complete acreage trades that allow the Company to drill wells with longer laterals, improving the expected returns of the wells. The Company estimates that the acreage trades completed in 20172020 added approximately 7.24 million lateral feet to the Company's drilling inventory.
The Company plans to operate an average of 18 to 20 drilling rigs in the Spraberry/Wolfcamp fieldPermian Basin in 2018,2021, with 16an average of 15 to 17 rigs operating in the northern portion of the play and fourMidland Basin, three rigs operating in the southern portion of the play.Midland Basin and one rig operating in the Delaware Basin on the acquired acreage from Parsley. During 2018,2021, for the Midland Basin, the Company expects to place on production between 250 and 275approximately 40 percent of its planned horizontal wells (200 to 225 horizontal wells in the northern portion of the play and approximately 50 horizontal wells in the southern portion of the play). Approximately 60 percent of the horizontal wells are planned to be drilled in the Wolfcamp B interval, 2540 percent in the Wolfcamp A interval, 15 percent in the Spraberry intervals and the remaining 15five percent will be a combination of wells in the Spraberry Shale intervals (Jo Mill, Lower Spraberry and Middle Spraberry) and a limited appraisal program for the Clearfork and Wolfcamp D intervals. The Company's 2018 appraisal program includes appraising: (i) its first Clearfork horizontal well (located in Midland County), (ii) seven wells in the Jo Mill and Middle Spraberry intervals in conjunction with nine Lower Spraberry Shale wells to determine an optimal development strategy for the Spraberry formation (these appraisals will test different spacing, staggering, sequencing, and completion design) and (iii) three Wolfcamp D interval wells.
Delaware Basin. The Company expects its Delaware Basin drilling activity to spend $2.6 billiontarget approximately 60 percent of its planned horizontal wells to be drilled in the Spraberry/Wolfcamp field during 2018, including $2.0 billion of horizontal drillingA and completion capital, $300 million for tank batteryB intervals and disposal facilities, $170 million for gas processing facilities and $110 million for land, science and other costs.
The Company continues to utilize its integrated services to control well costs and operating costs in addition to supporting the execution of its drilling and production activitiesapproximately 40 percent in the Spraberry/Wolfcamp field. The majority of 2018 drilling activities will be supported by seven of the Company's eight pressure pumping fleets. The Company also owns other field service equipment that supports its drilling and production operations, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools. The 2018 capital budget includes $78 million for upgrades and maintenance to the Company's pressure pumping and well service equipment.Bone Spring intervals.
The Company's sand mine in Brady, Texas, which is strategically located within close proximity (approximately190 miles) of the Spraberry/Wolfcamp field, provides a secure sand source for the Company's horizontal drilling program. In addition, Pioneer has signed a contract for its initial offtake of sand sourced in West Texas where significant new sand supplies are expected to be

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PIONEER NATURAL RESOURCES COMPANY

available in 2018. The Company is evaluating additional contracts for lower cost sand sourced in West Texas. As a result of the expected supply growth of West Texas sand, the planned expansion of the Company’s sand mine at Brady, Texas has been deferred.
In addition to the efficiencies from the Company's integrated services, the Company has been and continues to pursue initiatives to improve drilling and completion efficiencies and reduce costs. The Company's long-term growth plan continues to focus on optimizing the development of the field and addressing the future requirements for water sourcing and disposal, field infrastructure, gas processing, pipeline takeaway capacity for its products, oilfield services, tubulars, electricity, buildings and roads.
The Company is constructing a field-wide water distribution system to reduce the cost of water for drilling and completion activities and to secure adequate supplies of non-potable water to support the Company's long-term growth plan for the Spraberry/Wolfcamp field. Over the past few years, the Company has expanded its mainline system, subsystems and frac ponds to efficiently deliver water to many of Pioneer's drilling locations. The Company is purchasing approximately 120 thousand barrels per day of effluent water from the City of Odessa and has signed an agreement with the City of Midland to upgrade the City's wastewater treatment plant in return for a dedicated long-term supply of water from the plant. Once the Midland plant upgrade is complete, the Company expects to receive approximately two billion barrels of low-cost, non-potable water over a 28-year contract period (up to 240 thousand barrels per day) to support its completion operations. During 2018, the Company expects to spend approximately $135 million to begin the Midland plant upgrade construction and build additional subsystems, frac ponds and produced water reuse facilities.
South Texas Eagle Ford Shale. During 2017, the Company operated two rigs in the Eagle Ford Shale area and drilled 11 new Eagle Ford Shale wells. The objective of this drilling program was to test longer laterals with wider spacing and higher intensity completions in the new wells. The Company's 2017 completions included 25 wells in South Texas, comprising 11 new Eagle Ford Shale wells and nine wells that were drilled but not completed in 2016, as well as five oil wells in the Wilcox formation that were drilled and placed on production during 2017.
See Note Q of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's plan to sell its South Texas assets.
Raton Basin. The Raton Basin properties are located in the southeast portion of Colorado. The Company owns approximately 180,000 gross acres (165,000 net acres) in the center of the Raton Basin and produces coal bed methane gas from the coal seams in the Vermejo and Raton formations from approximately 2,200 wells.
See Note Q of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's plan to sell its Raton Basin assets.
West Panhandle. The West Panhandle properties are located in the panhandle region of Texas. These stable, long-lived reserves are attributable to the Red Cave, Brown Dolomite, Granite Wash and fractured Granite formations at depths no greater than 3,500 feet. The Company's gas has an average energy content of 1,400 Btu and is produced from approximately 700 wells on approximately 240,000 gross and net acres covering approximately 375 square miles.
See Note Q of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's plan to sell its West Panhandle assets.
See Note D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the impairment charges recorded during 2017, 2016 and 2015 to reduce the carrying value of the Company's properties in the Raton, West Panhandle, South Texas - Eagle Ford Shale and South Texas - Other fields.
Selected Oil and Gas Information
The following tables set forth selected oil and gas information for the Company as of and for each of the years ended December 31, 2017, 2016 and 2015. Because of normal production declines, increased or decreased drilling activities and the effects of acquisitions or divestitures, the historical information presented below should not be interpreted as being indicative of future results.
Production, price and cost data. The price that the Company receives for the oil and gas it produces is largely a function of market supply and demand. Demand is affected by general economic conditions, as evidenced by the significant demand reduction during 2020 as a result of the COVID-19 pandemic, weather and other seasonal conditions, including hurricanes and tropical storms. Over or under supply of oil or gas can result in substantial price volatility. Historically, commodity prices have been volatile and the Company expects that volatility to continue in the future. Adecline in oil, NGL and gas prices or poor drilling results could have a material adverse effect on the Company's financial position, results of operations, cash flows, quantities of oil and gas reserves that may be economically produced and the Company's ability to access the capital markets.

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PIONEER NATURAL RESOURCES COMPANY

The following tables set forth production, price and cost data with respect to the Company's properties for 2017, 2016 and 2015.properties. These amounts represent the Company's historical results of operations without making pro forma adjustments for any acquisitions, divestitures or drilling activity that occurred during the respective years. The production amounts will not match the proved reserve volume tables in the "Unaudited Supplementary Information" section included in "Item 8. Financial Statements and Supplementary Data" because field fuel volumes are included in the proved reserve volume tables.

Because of normal production declines, increased or decreased drilling activities and the effects of acquisitions or divestitures, the historical information presented below should not be interpreted as being indicative of future results.
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PRODUCTION, PRICE AND COST DATA
 Year Ended December 31, 2020
 Permian BasinTotal Company
Annual sales volumes:
Oil (MBbls)77,086 77,095 
NGLs (MBbls)31,368 31,376 
Gas (MMcf)155,611 155,662 
Total (MBOE)134,389 134,415 
Average daily sales volumes:
Oil (Bbls)210,618 210,641 
NGLs (Bbls)85,706 85,728 
Gas (Mcf)425,167 425,307 
Total (BOE)367,185 367,253 
Average prices:
Oil (per Bbl)$37.24 $37.24 
NGLs (per Bbl)$15.62 $15.62 
Gas (per Mcf)$1.73 $1.73 
Revenue (per BOE)$27.01 $27.01 
Average costs (per BOE):
Production costs:
Lease operating$3.00 $3.00 
Gathering, processing and transportation2.59 2.59 
Net natural gas plant/gathering(0.76)(0.76)
Workover0.24 0.24 
Total$5.07 $5.07 
Production and ad valorem taxes:
Ad valorem$0.64 $0.64 
Production1.17 1.17 
Total$1.81 $1.81 
Depletion expense$11.55 $11.55 
 Year Ended December 31, 2017
 
Spraberry/
Wolfcamp
Field
 
Eagle Ford
Shale Field
 
Raton
Field
 
Total Company
Fields
Production information:       
Annual sales volumes:       
Oil (MBbls)53,889
 2,830
 
 57,878
NGLs (MBbls)16,096
 2,607
 
 20,078
Gas (MMcf)71,140
 16,074
 32,302
 128,665
Total (MBOE)81,842
 8,116
 5,384
 99,401
Average daily sales volumes:       
Oil (Bbls)147,641
 7,754
 
 158,571
NGLs (Bbls)44,099
 7,141
 
 55,008
Gas (Mcf)194,904
 44,039
 88,497
 352,507
Total (BOE)224,224
 22,235
 14,750
 272,330
Average prices:       
Oil (per Bbl)$48.32
 $47.78
 $
 $48.24
NGL (per Bbl)$18.69
 $19.39
 $
 $19.31
Gas (per Mcf)$2.45
 $3.06
 $2.74
 $2.63
Revenue (per BOE)$37.62
 $28.95
 $16.47
 $35.39
Average costs (per BOE):       
Production costs:       
Lease operating$4.36
 $4.56
 $5.92
 $4.58
Third-party transportation charges0.19
 6.26
 2.21
 0.85
Net natural gas plant/gathering(0.63) (0.03) 2.03
 (0.28)
Workover0.87
 0.56
 0.47
 0.80
Total$4.79
 $11.35
 $10.63
 $5.95
Production and ad valorem taxes:       
Ad valorem$0.58
 $0.41
 $0.54
 $0.57
Production1.81
 0.72
 0.15
 1.59
Total$2.39
 $1.13
 $0.69
 $2.16
Depletion expense$15.34
 $8.79
 $2.44
 $13.61



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PRODUCTION, PRICE AND COST DATA - (continued)
 Year Ended December 31, 2019
 Permian BasinTotal Company
Annual sales volumes:
Oil (MBbls)77,053 77,509 
NGLs (MBbls)25,960 26,398 
Gas (MMcf)128,848 133,245 
Total (MBOE)124,488 126,114 
Average daily sales volumes:
Oil (Bbls)211,104 212,353 
NGLs (Bbls)71,123 72,323 
Gas (Mcf)353,007 365,055 
Total (BOE)341,062 345,518 
Average prices:
Oil (per Bbl)$53.77 $53.77 
NGLs (per Bbl)$19.36 $19.33 
Gas (per Mcf)$1.75 $1.79 
Revenue (per BOE)$39.13 $38.98 
Average costs (per BOE):
Production costs:
Lease operating$4.52 $4.57 
Gathering, processing and transportation2.19 2.24 
Net natural gas plant/gathering(0.60)(0.59)
Workover0.72 0.71 
Total$6.83 $6.93 
Production and ad valorem taxes:
Ad valorem$0.62 $0.63 
Production1.76 1.75 
Total$2.38 $2.38 
Depletion expense$12.85 $12.78 
 Year Ended December 31, 2016
 
Spraberry/
Wolfcamp
Field
 
Eagle Ford
Shale Field
 
Raton
Field
 
Total Company
Fields
Production information:       
Annual sales volumes:       
Oil (MBbls)43,049
 4,418
 
 48,926
NGLs (MBbls)10,886
 3,755
 
 15,922
Gas (MMcf)51,528
 26,133
 35,368
 124,428
Total (MBOE)62,523
 12,528
 5,895
 85,586
Average daily sales volumes:       
Oil (Bbls)117,619
 12,070
 
 133,677
NGLs (Bbls)29,743
 10,260
 
 43,504
Gas (Mcf)140,788
 71,402
 96,634
 339,966
Total (BOE)170,827
 34,231
 16,106
 233,842
Average prices:       
Oil (per Bbl)$40.30
 $35.60
 $
 $39.65
NGL (per Bbl)$13.48
 $12.86
 $
 $13.49
Gas (per Mcf)$2.11
 $2.36
 $1.87
 $2.11
Revenue (per BOE)$31.84
 $21.32
 $11.25
 $28.25
Average costs (per BOE):       
Production costs:       
Lease operating$5.35
 $2.87
 $5.07
 $5.02
Third-party transportation charges0.20
 6.81
 2.93
 1.41
Net natural gas plant/gathering(0.43) (0.04) 1.96
 0.01
Workover0.35
 0.40
 0.32
 0.35
Total$5.47
 $10.04
 $10.28
 $6.79
Production and ad valorem taxes:       
Ad valorem$0.50
 $0.31
 $0.07
 $0.46
Production1.44
 0.36
 0.01
 1.14
Total$1.94
 $0.67
 $0.08
 $1.60
Depletion expense$19.62
 $12.61
 $5.42
 $16.77


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PRODUCTION, PRICE AND COST DATA - (continued)
 Year Ended December 31, 2018
 Permian BasinTotal Company
Annual sales volumes:
Oil (MBbls)66,212 69,583 
NGLs (MBbls)19,878 23,280 
Gas (MMcf)102,934 143,588 
Total (MBOE)103,245 116,794 
Average daily sales volumes:
Oil (Bbls)181,402 190,639 
NGLs (Bbls)54,459 63,780 
Gas (Mcf)282,010 393,391 
Total (BOE)282,862 319,984 
Average prices:
Oil (per Bbl)$57.13 $57.36 
NGLs (per Bbl)$30.32 $29.84 
Gas (per Mcf)$1.90 $2.13 
Revenue (per BOE)$44.37 $42.73 
Average costs (per BOE):
Production costs:
Lease operating$4.27 $4.29 
Gathering, processing and transportation2.21 2.52 
Net natural gas plant/gathering(0.67)(0.41)
Workover1.01 0.92 
Total$6.82 $7.32 
Production and ad valorem taxes:
Ad valorem$0.59 $0.60 
Production1.94 1.83 
Total$2.53 $2.43 
Depletion expense$13.42 $12.52 
  Year Ended December 31, 2015
  
Spraberry/
Wolfcamp
Field
 
Eagle Ford
Shale Field
 
Raton
Field
 
Total Company
Fields
Production information:       
Annual sales volumes:       
Oil (MBbls)30,312
 6,450
 
 38,452
NGLs (MBbls)8,507
 4,230
 
 14,086
Gas (MMcf)41,577
 35,220
 40,761
 131,642
Total (MBOE)45,748
 16,550
 6,794
 74,478
Average daily sales volumes:       
Oil (Bbls)83,046
 17,670
 
 105,347
NGLs (Bbls)23,306
 11,590
 
 38,592
Gas (Mcf)113,909
 96,492
 111,675
 360,662
Total (BOE)125,336
 45,343
 18,613
 204,050
Average prices:       
Oil (per Bbl)$44.30
 $41.74
 $
 $43.55
NGL (per Bbl)$12.95
 $13.90
 $
 $13.31
Gas (per Mcf)$2.29
 $2.69
 $2.22
 $2.40
Revenue (per BOE)$33.84
 $25.55
 $13.30
 $29.25
Average costs (per BOE):       
Production costs:       
Lease operating$9.08
 $3.21
 $6.04
 $7.24
Third-party transportation charges0.26
 4.90
 3.12
 1.60
Net natural gas plant/gathering(0.45) 0.02
 1.82
 0.16
Workover0.61
 0.99
 
 0.62
Total$9.50
 $9.12
 $10.98
 $9.62
Production and ad valorem taxes:       
Ad valorem$0.92
 $0.50
 $0.27
 $0.76
Production (a)1.62
 0.65
 (0.01) 1.19
Total$2.54
 $1.15
 $0.26
 $1.95
Depletion expense$22.12
 $15.80
 $5.19
 $18.01
 ______________________
(a)The credit amount in production taxes per BOE for the Raton field is due to the receipt of a severance tax refund from the state of Colorado.


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Productive wells. Productive wells consist of producing wells and wells capable of production, including shut-inoil wells andawaiting connection to production facilities, gas wells awaiting pipeline connections to commence deliveries and oil wells awaiting connection to production facilities.shut-in wells. One or more completions in the same well bore are counted as one well. Any well in which one of the multiple completions is an oil completion is classified as an oil well.
The following table sets forth the number of productiveProductive oil and gas wells attributable to the Company's properties are as of December 31, 2017:follows:
PRODUCTIVE WELLS
As of December 31, 2020
Gross Productive WellsNet Productive Wells
OilGasTotalOilGasTotal
6,711116,7225,83675,843
Gross Productive Wells Net Productive Wells
Oil Gas Total Oil Gas Total
6,905
 3,679
 10,584
 6,146
 3,150
 9,296
Leasehold acreage. The following table sets forth information about the Company's developed,Developed, undeveloped and royalty leasehold acreage is as of December 31, 2017:follows:
LEASEHOLD ACREAGE
As of December 31, 2020As of December 31, 2020
Developed AcreageDeveloped Acreage Undeveloped Acreage Royalty AcreageDeveloped AcreageUndeveloped AcreageRoyalty Acreage
Gross AcresGross Acres Net Acres Gross Acres Net Acres Gross AcresNet AcresGross AcresNet Acres
1,315,707
 1,132,711
 111,627
 104,894
 241,133
700,381700,381626,91468,39065,100106,500
The following table sets forth the expiration dates of the leases on the Company'sattributable to gross and net undeveloped acres are as follows:
As of December 31, 2020
 Acres Expiring (a)
 GrossNet
20218,687 8,317 
20223,165 2,267 
20231,496 820 
2024160 51 
2025480 320 
Thereafter54,402 53,325 
68,390 65,100 
 _____________________
(a)Acres expiring are based on contractual lease maturities.
All of December 31, 2017:
 Acres Expiring (a)
 Gross Net
201887,718
 84,683
20198,031
 6,630
20201,950
 1,320
20211,487
 1,072
2022
 
Thereafter12,441
 11,189
Total111,627
 104,894
 _____________________
(a)Acres expiring are based on contractual lease maturities.
Of the 91,31310,584 net acres expiring in 20182021 and 2019, 60,485 net acres (66 percent)2022 are concentrated in eastern Colorado. Over the past few years, the Company has conducted limited exploratory activities across this acreage. The Company's exploratory drilling activities have not resulted in discovering commercial quantities of hydrocarbons; therefore, no proved reserves have been attributed to any of this acreage. The remainder of the net undeveloped acres expiring over the next two year period is primarily concentrated in the Permian Basin in West Texas, where the Company has an active drilling program and ongoing efforts to extend leases that may not be drilled prior to expiration. The Company currently has no proved undeveloped reserve locations scheduled to be drilled after lease expiration. Additionally, approximately 6,000 of the net acres expiring in 2021 and approximately 53,000 net acres expiring after 2025 are subject to continuous drilling obligations, which the Company expects to meet with its active drilling program.










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Drilling and other exploratory and development activities. The following table sets forth the number of gross and net wells drilled by the Company during 2017, 2016 and 2015 that were productive or dry holes. This information should not be considered indicative of future performance, nor should it be assumed that there was any correlation between the number of productive wells drilled and the oil and gas reserves generated thereby or the costs to the Company of productive wells compared to the costs of dry holes.
DRILLING ACTIVITIES
 Gross WellsNet Wells
 Year Ended December 31,Year Ended December 31,
 202020192018202020192018
Productive wells:
Development13 26 35 12 20 23 
Exploratory/extension242 280 251 218 249 226 
Dry holes:
Development— — — — 
Exploratory/extension— 10 — 
255 307 297 230 270 256 
Success ratio (a)100 %100 %96 %100 %100 %97 %
 ______________________
 Gross Wells Net Wells
 Year Ended December 31, Year Ended December 31,
 2017 2016 2015 2017 2016 2015
Productive wells:           
Development26
 39
 116
 20
 32
 78
Exploratory222
 215
 218
 198
 194
 151
Dry holes:           
Development
 
 
 
 
 
Exploratory2
 
 2
 1
 
 1
Total250
 254
 336
 219
 226
 230
Success ratio (a)99% 100% 99% 99% 100% 99%
 ______________________
(a)(a)Represents the ratio of those wells that were successfully completed as producing wells or wells capable of producing to total wells drilled and evaluated.
Present activities. The following table sets forth information about the Company's wells that were successfully completed as producing wells or wells capable of producing to total wells drilled and evaluated.
Wells in process of being drilled are as of December 31, 2017:follows:
As of December 31, 2020
Gross WellsNet Wells
Development
Exploratory/extension210 183 
219 192 

ITEM 3.LEGAL PROCEEDINGS
 Gross Wells Net Wells
Development14
 12
Exploratory136
 123
Total150
 135
ITEM 3.LEGAL PROCEEDINGS
The Company is party to various proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to these 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. See Note J11 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding legal proceedings involving the Company.information.
ITEM 4.MINE SAFETY DISCLOSURES
Not applicable.

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ITEM 4.MINE SAFETY DISCLOSURES
The Company's sand mines are subject to regulation by the Federal Mine Safety and Health Administration under the Federal Mine Safety and Health Act of 1977, as amended by the Mine Improvement and New Emergency Response Act of 2006. Information concerning mine safety violations or other regulatory matters required by Section 1503(a) of the Dodd-Frank Wall Street Reform and Consumer Protection Act and Item 104 of Regulation S-K is included in Exhibit 95.1 to this Annual Report filed on Form 10-K.

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INFORMATION ABOUT OUR EXECUTIVE OFFICERS OF THE REGISTRANT
The following table sets forth certain information as of the date of this Report regarding the Company's executive officers. All of the Company's executive officers serve at the discretion of the Company's board of directors. There are no family relationships among any of the Company's directors or executive officers.
NamePositionAge
Scott D. SheffieldChief Executive Officer68
Richard P. DealyPresident and Chief Operating Officer54
Mark S. BergExecutive Vice President, Corporate Operations62
Chris J. CheatwoodExecutive Vice President, Advisor to the Management Committee60
J.D. HallExecutive Vice President, Operations55
Mark H. KleinmanExecutive Vice President and General Counsel59
NameElizabeth A. McDonaldPositionSenior Vice President, Strategic Planning, Field Development and MarketingAge42
Timothy L. DoveNeal H. ShahPresident and Chief Executive Officer61
Mark S. BergExecutive Vice President, Corporate/Vertically Integrated Operations59
Chris J. CheatwoodExecutive Vice President and Chief Technology Officer57
Richard P. DealyExecutiveSenior Vice President and Chief Financial Officer5150
J.D. HallExecutive Vice President, Permian Operations52
Kenneth H. Sheffield, Jr.Executive Vice President, Operations/Engineering/Facilities57
William F. HannesSenior Vice President, Special Projects58
Frank E. HopkinsSenior Vice President, Investor Relations69
Mark H. KleinmanSenior Vice President and General Counsel56
Teresa A. FairbrookVice President and Chief Human Resources Officer44
Margaret M. MontemayorVice President and Chief Accounting Officer40
Stephanie D. StewartVice President and Chief Information Officer4943
Timothy L. DoveScott D. Sheffield
Mr. DoveSheffield has served as the Company's Chief Executive Officer since February 2019, and held the additional title of President from February 2019 through the end of 2020. Previously, he had served as Chief Executive Officer of the Company from 1997 through December 31, 2016, and then as the Executive Chairman until December 31, 2017. He has served as a director of the Company since 1997 and had served as Chairman of the Board from 1999 through February 2019. Mr. Sheffield was the Chairman of the Board of Directors and Chief Executive Officer of Parker & Parsley Petroleum Company, a predecessor of the Company (together with its predecessor companies, "Parker & Parsley"), from January 1989 until the Company was formed in August 1997. Mr. Sheffield joined Parker & Parsley as a petroleum engineer in 1979, was promoted to Vice President - Engineering in September 1981, was elected President and a Director in April 1985, and became Parker & Parsley's Chairman of the Board and Chief Executive Officer on January 19, 1989. Before joining Parker & Parsley, Mr. Sheffield was employed as a production and reservoir engineer for Amoco Production Company. Mr. Sheffield is also a director of The Williams Companies, Inc. Mr. Sheffield is a distinguished graduate of the University of Texas with a Bachelor of Science degree in Petroleum Engineering.
Richard P. Dealy
Mr. Dealy was elected as the Company's President and Chief ExecutiveOperating Officer sinceeffective January 1, 2017. He held2021. Prior to that, Mr. Dealy had served as the positions for the Company of President and Chief Operating Officer from December 2004 to January 2017,Company's Executive Vice President and Chief Financial Officer since November 2004. Mr. Dealy held positions for the Company as Vice President and Chief Accounting Officer from February 20001998 to November 2004 and Executive Vice President - Business Developmentand Controller from August 1997 to January 2000.1998. Mr. Dove also served as President and Chief Operating Officer of the general partner of Pioneer Southwest Energy Partners L.P. ("Pioneer Southwest") from June 2007 through the Company's acquisition of Pioneer Southwest in December 2013. Mr. DoveDealy joined Parker & Parsley in 1994 as a Vice PresidentJuly 1992 and was promoted to Senior Vice President - Business Developmentand Controller in October 1996, in which position he served until the Company's formation in August 1997. Before joining Parker & Parsley, Mr. DoveDealy was employed by KPMG LLP. Mr. Dealy graduated with Diamond Shamrock Corp and its successor, Maxus Energy Corp., in various capacities in international exploration and production, marketing, refining, and planning and development. Mr. Dove earnedhonors from Eastern New Mexico University with a Bachelor of ScienceBusiness Administration degree in Mechanical Engineering from Massachusetts Institute of TechnologyAccounting and received his Master of Business Administration from the University of Chicago.Finance and is a Certified Public Accountant.
Mark S. Berg
Mr. Berg was electedjoined the Company'sCompany as Executive Vice President and General Counsel in April 2005, serving in those capacitiesthat capacity until January 2014, at which time he assumed broader executive responsibilities, most recently being elected to serve as Executive Vice President, Corporate/Vertically IntegratedCorporate Operations, in May 2017. Mr. Berg had previously served as Executive Vice President, Corporate/Operations since August 2015 and Executive Vice President and General Counsel of the general partner of Pioneer Southwest from June 2007 through the Company's acquisition of Pioneer Southwest in December 2013.April 2019. Prior to joining the Company, Mr. Berg served as Executive Vice President, General Counsel and Secretary of American General Corporation, a Fortune 200 diversified financial services company, from 1997 through 2002. Subsequent to the sale of American General to American International Group, Inc., Mr. Berg joined Hanover Compressor Company as Senior Vice President, General Counsel and Secretary. He served in that capacity from May 2002 through April 2004. Mr. Berg began his career in 1983 with the Houston-based law firm of Vinson & Elkins L.L.P. He was a partner with the firm from 1990 through 1997. Mr. Berg is also a director of ProPetro Holding Corp. and a director and Vice Chairman of Permian Strategic Partnership Inc. Mr. Berg graduated Magna Cum Laude and Phi Beta Kappa with a Bachelor of Arts degree from Tulane University in 1980. He earned his Juris Doctorate with honors from the University of Texas School of Law in 1983.

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PIONEER NATURAL RESOURCES COMPANY
Chris J. Cheatwood
Mr. Cheatwood was elected as an Executive Vice President of the Company'sCompany in November 2007 and Executive Vice President, Advisor to the Management Committee effective January 1, 2021, having served as Executive Vice President, Field Development and Emerging Technology from April 2019 to January 2021, Executive Vice President and Chief Technology Officer infrom May 2017. Mr. Cheatwood had previously served the Company as2017 to April 2019, Executive Vice President, Business Development and Geoscience sincefrom November 2011 to May 2017, Executive Vice President, Business Development and Technology, from February 2010 untilto November 2011, Executive Vice President, Geoscience from November 2007 untilto February 2010, and Executive Vice President - Worldwide Exploration from January 2002 untilto November 2007,2007. He also served as Senior Vice President - Worldwide Exploration from December 2000 to January 2002 and Vice President - Domestic Exploration from July 1998 to December 2000. Mr. Cheatwood also served as an Executive Vice President of the general partner of Pioneer Southwest from June 2007 through the Company's acquisition of Pioneer Southwest

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in December 2013. Before joining the Company, Mr. Cheatwood spent ten years with Exxon Corporation. Mr. Cheatwood is a graduate of the University of Oklahoma with a Bachelor of Science degree in Geology and earned his Master of Science degree in Geology from the University of Tulsa.
Richard P. Dealy
Mr. Dealy was elected the Company's Executive Vice President and Chief Financial Officer in November 2004. Mr. Dealy held positions for the Company as Vice President and Chief Accounting Officer from February 1998 to November 2004 and Vice President and Controller from August 1997 to January 1998. Mr. Dealy also served as Executive Vice President, Chief Financial Officer, Treasurer and Director of the general partner of Pioneer Southwest from June 2007 through the Company's acquisition of Pioneer Southwest in December 2013. Mr. Dealy joined Parker & Parsley in July 1992 and was promoted to Vice President and Controller in 1996, in which position he served until August 1997. He is a Certified Public Accountant, and before joining Parker & Parsley, he was employed by KPMG LLP. Mr. Dealy graduated with honors from Eastern New Mexico University with a Bachelor of Business Administration degree in Accounting and Finance and is a Certified Public Accountant.
J. D. Hall
Mr. Hall was elected as the Company's Executive Vice President, Permian Operations, in August 2015.April 2019. Mr. Hall had previously held positions for the Company as Executive Vice President, Permian Operations, from August 2015 to April 2019, Executive Vice President, Southern Wolfcamp Operations from August 2014 to August 2015, Senior Vice President, South Texas Operations from June 2013 to August 2014, Vice President, South Texas Operations from February 2013 to June 2013, Vice President, South Texas Asset Team from September 2012 to February 2013 and Vice President, Eagle Ford Asset Team from January 2010 to September 2012. Prior to his positions in South Texas, he was the Operations Manager in Alaska from January 2005 to January 2010. He previously held several other positions with the Company, including managing offshore, onshore and international projects. He began his career with a predecessor company, MESA, Inc. ("MESA"), in 1989. He has a Bachelor of Science degree in Mechanical Engineering from Texas Tech University and is a Registered Professional Engineerregistered professional engineer in Texas.
Kenneth H. Sheffield, Jr.
Mr. Sheffield was elected as Executive Vice President, Operations/Engineering/Facilities in May 2017. Mr. Sheffield has previously served the Company in a number of executive positions, including Executive Vice President, STAT (the Company's South Texas Asset Team), WAT (the Company's Western Asset Team) and Corporate Engineering from August 2015 to May 2017, Executive Vice President, South Texas Operations from August 2014 to August 2015, Senior Vice President, Operations and Engineering from June 2013 to August 2014, Vice President, Corporate Engineering from November 2011 to June 2013 and President of the Company's Alaska subsidiary from September 2002 to November 2011. Mr. Sheffield joined MESA in June 1982 and held a number of supervisory and technical positions with MESA in the areas of drilling, production, reservoir engineering and acquisitions until being promoted to Vice President Acquisitions & Development in 1996. He is a graduate of Texas A&M University with a Bachelor of Science degree in Petroleum Engineering.
William F. Hannes
Mr. Hannes was elected the Company's Senior Vice President, Special Projects in January 2017. Mr. Hannes had previously served the Company as Senior Vice President, Special Management Committee Advisor since August 2014, Executive Vice President, Southern Wolfcamp Operations from February 2013 until August 2014, Executive Vice President, South Texas Operations from February 2010 until February 2013, Executive Vice President, Business Development from December 2007 until February 2010, Executive Vice President, Worldwide Business Development from November 2005 until December 2007 and Vice President, Engineering and Development from September 2003 until November 2005. Mr. Hannes joined Parker & Parsley in July 1997 as Director of Business Development, and continued to serve the Company in this capacity after the Company's formation in August 1997 until he was promoted to Vice President - Engineering and Development in June 2001, which position he held until November 2005. Prior to joining Parker & Parsley, Mr. Hannes held engineering positions with Mobil Corporation and Superior Oil Company. Mr. Hannes earned his Bachelor of Science degree in Petroleum Engineering from Texas A&M University.
Frank E. Hopkins
Mr. Hopkins was elected the Company's Senior Vice President, Investor Relations in August 2011. Mr. Hopkins had previously held the position of Vice President, Investor Relations since joining the Company in February 2005. Before joining the Company, Mr. Hopkins was with Exxon Mobil Corporation where he served as General Manager, Strategic Planning for the Global Services Company, and as Deputy Manager, Investor Relations. He also served in various capacities with Mobil Corporation, including Manager, Investor Relations and Assistant Controller. Mr. Hopkins earned his Bachelor of Science degree in Business

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Administration from Penn State University and also participated in the executive education program at the Kellogg School of Management of Northwestern University.
Mark H. Kleinman
Mr. Kleinman was elected as the Company's Executive Vice President and General Counsel in April 2019. He also held the positions of Senior Vice President and General Counsel infrom January 2014. He also held the positions of2014 through April 2019, Vice President from May 2006 until January 2014, Corporate Secretary from June 2005 through August 2015, Vice President from May 2006 until January 2014 and Chief Compliance Officer from June 2005 until May 2013. Mr. Kleinman also served as Vice President and Secretary of the general partner of Pioneer Southwest from June 2007 until April 2008 and as its Vice President and Chief Compliance Officer from April 2008 through the Company's acquisition of Pioneer Southwest in December 2013. Mr. Kleinman earned a Bachelor of Arts degree in Government from the University of Texas and graduated, with honors, from the University of Texas School of Law.
TeresaElizabeth A. FairbrookMcDonald
Ms. FairbrookMcDonald was elected as the Company's Senior Vice President, Strategic Planning, Field Development and Chief Human Resources Officer in March 2016, prior to which sheMarketing, effective January 1, 2021. Ms. McDonald had servedpreviously held positions for the Company as Vice President, Human Resources since February 2013.Permian Strategic Planning and Field Development, from May 2019 to January 2021, Vice President, Permian Infrastructure Development and Operations, from April 2018 to May 2019, Vice President, South Texas Asset Team, from March 2017 to April 2018, and Vice President, South Texas Subsurface, from August 2014 to March 2017. She joined the Company in 1999, serving in2005 as a reservoir engineer on the Engineering and Development team focused on the Gulf of Mexico and North Africa exploration projects, and has held a number of positions, including as Senior Reservoir Engineering Manager – South Texas Asset Team, Manager of Planning – Corporate Finance, Business Analyst – Worldwide Operations, Senior Reservoir Engineer – Central Gulf Coast Exploration and Reservoir Engineer – Engineering and Development. Ms. McDonald earned a Bachelor of Science, Petroleum Engineering degree in 2001 from Texas A&M University and is a registered professional engineer in Texas.
Neal H. Shah
Mr. Shah was elected as the Human Resources Department. Prior toCompany's Senior Vice President and Chief Financial Officer, effective January 1, 2021. Mr. Shah joined the Company in June 2017 as Vice President, Investor Relations. Before joining the Company, Ms. Fairbrook wasMr. Shah served as Senior Equity Research Analyst at Thrivent Asset Management from June 2016 to June 2017, and as Vice President at Nuveen LLC from March 2006 to June 2016. He has a financial and equity research background and has held various financial analysis positions at Piper Jaffray & Company, RBC Capital Markets and Goldman Sachs & Company. Mr. Shah earned a Bachelor of Science degree in human resources at Dal-Tile Corporation in Dallas, Texas, where she heldElectrical Engineering from Louisiana State University and a variety of roles in employee relations, recruiting and benefits. Ms. Fairbrook received a BachelorMaster of Business Administration degree from St. Mary'sthe Booth School of Business at the University in San Antonio, Texas, with an emphasis in Human Resource Management,of Chicago, where he was a Siebel Scholar and is a Certified Compensation Professional.recipient of the Irwin J. Biederman Leadership award.

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PIONEER NATURAL RESOURCES COMPANY
Margaret M. Montemayor
Ms. Montemayor was elected as the Company's Vice President and Chief Accounting Officer in March 2014. Ms. Montemayor had2014, having previously served the Company as Vice President and Corporate Controller since January 2014, Corporate Controller from April 2012 to December 2013 and Director of Technical Accounting and Financial Reporting from June 2010 to March 2012. Prior to joining the Company, Ms. Montemayor served as Manager atspent ten years in public accounting with both Arthur Andersen and PricewaterhouseCoopers, LLP since June 2006.serving in Dallas, Texas and Zurich, Switzerland. Ms. Montemayor graduated from St. Mary's University in San Antonio, Texas with a Bachelor of Business Administration degree in Accounting and a Master of Business Administration degree and is a Certified Public Accountant.
Stephanie D. Stewart
Ms. Stewart joined the Company in June 2014 as Vice President and Chief Information Officer. Before joining the Company, she served as Vice President of E&P Data and Analytics at Devon Energy at the end of her 12-year tenure there. Prior to Devon, she worked in information technology at Williams Energy and BP Amoco. Ms. Stewart earned a Bachelor of Business Administration degree from the University of Oklahoma and her Executive MBA in Energy from the University of Oklahoma's Price College of Business.
Officers are generally elected by the Company's board of directors at its meeting on the day of each annual election of directors, with each such officer serving until a successor has been elected and qualified.


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PIONEER NATURAL RESOURCES COMPANY

PART II
ITEM 5.MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS
ITEM 5.MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES
The Company's common stock is listed and traded on the NYSE under the symbol "PXD." The Company's board of directors (the "Board") declaredhas authority to declare dividends to the holders of the Company's common stockstock. The board of $0.04 per share during each of the first and third quarters of the years ended December 31, 2017 and 2016. The Boarddirectors intends to considercontinue the payment of dividends to the holders of the Company's common stock in the future. The declaration and payment of future dividends, however, will be at the discretion of the Boardboard of directors and will depend on, among other things, the Company's earnings, financial condition, capital requirements, level of indebtedness, statutory and contractual restrictions applying to the payment of dividends and other considerations that the Boardboard of directors deems relevant. In February 2018, the Board (i) declared a cash dividend of $0.16 per share on Pioneer’s outstanding common stock, payable April 12, 2018 to stockholders of record at the close of business on March 29, 2018 and (ii) approved a common stock repurchase program to offset the impact of dilution associated with annual employee stock awards. The stock repurchase program allows for up to $100 million of common stock to be repurchased during 2018.
The following table sets forth quarterly high and low prices of the Company's common stock and dividends declared per share for the years ended December 31, 2017 and 2016:
 High Low 
Dividends
Declared
Per Share
Year ended December 31, 2017     
Fourth quarter$174.59
 $140.31
 $
Third quarter$166.29
 $125.46
 $0.04
Second quarter$192.93
 $153.42
 $
First quarter$199.83
 $168.13
 $0.04
Year ended December 31, 2016     
Fourth quarter$195.00
 $166.50
 $
Third quarter$190.94
 $147.21
 $0.04
Second quarter$171.88
 $136.97
 $
First quarter$145.87
 $103.50
 $0.04
On February 14, 2018, the last reported sales price of the Company's common stock, as reported in the NYSE composite transactions, was $179.50 per share.
As of February 14, 2018,22, 2021, the Company's common stock was held by 10,6339,082 holders of record.
Purchases of Equity Securities by the Issuer and Affiliated Purchasers
The following table summarizesPurchases of the Company's purchases of its common stock are as follows:
Three Months Ended December 31, 2020
PeriodTotal Number of
Shares Purchased (a)
Average Price Paid per ShareTotal Number of 
Shares Purchased as
Part of Publicly
Announced Plans
or Programs
Approximate Dollar
Amount of Shares
that May Yet Be
Purchased under
Plans or Programs (b)
October 2020749 $83.00 — $1,090,693,886 
November 2020453 $79.56 — $1,090,693,886 
December 202014,638 $110.85 — $1,090,693,886 
15,840 — 
__________________
(a)Includes shares purchased from employees in order for employees to satisfy income tax withholding payments related to share-based awards that vested during the three months endedperiod.
(b)In December 31, 2017.2018, the Company's board of directors authorized a $2 billion0 common stock repurchase program. The stock repurchase program has no time limit and may be modified, suspended or terminated at any time by the board of directors.
PeriodTotal Number of
Shares Purchased (a)
 Average Price Paid per Share Total Number of 
Shares Purchased as
Part of Publicly
Announced Plans
or Programs
 Approximate Dollar
Amount of Shares
that May Yet Be
Purchased under
Plans or Programs
October 2017
 $
 
 
November 2017
 $
 
 
December 2017174
 $156.58
 
 
Total174
 $156.58
 
 $
_____________________
(a)Consists of shares purchased from employees in order for employees to satisfy tax withholding payments related to share-based awards that vested during the period.


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PIONEER NATURAL RESOURCES COMPANY

ITEM 6.SELECTED FINANCIAL DATA
Performance Graph
The following selected consolidated financial dataperformance graph and related information shall not be deemed "soliciting material" or to be "filed" with the SEC, nor shall the information be incorporated by reference into any future filing under the Securities Act of 1933 or Securities Exchange Act of 1934, each as amended, except to the extent that the Company as of and for each ofspecifically incorporates it by reference into such filing.
The graph below compares the five yearscumulative total stockholder return on the Company's common stock during the five-year period ended December 31, 2017 should be read2020, with cumulative total returns during the same period for the Standard & Poor's ("S&P") 500 Index and the S&P Oil and Gas Exploration & Production Index.

pxd-20201231_g1.jpg
As of December 31,
201520162017201820192020
Pioneer Natural Resources Company$100.00 $143.69 $138.00 $105.20 $122.11 $94.22 
S&P 500$100.00 $111.96 $136.40 $130.42 $171.49 $203.04 
S&P Oil & Gas Exploration & Production$100.00 $132.86 $124.48 $100.20 $112.25 $72.49 
The stock price performance included in conjunction with "Item 7. Management's Discussion and Analysisthis graph is not necessarily indicative of Financial Condition and Results of Operations" and "Item 8. Financial Statements and Supplementary Data."future stock price performance.
ITEM 6.SELECTED FINANCIAL DATA
Not applicable.
 Year Ended December 31,
 2017 2016 2015 2014 2013
 (in millions, except per share data)
Statements of Operations Data:         
Oil and gas revenues$3,518
 $2,418
 $2,178
 $3,599
 $3,088
Total revenues and other income (a)$5,455
 $3,382
 $4,561
 $4,954
 $3,658
Total costs and expenses (a)(b)$5,146
 $4,341
 $4,982
 $3,357
 $4,232
Income (loss) from continuing operations$833
 $(556) $(266) $1,041
 $(361)
Loss from discontinued operations, net of tax (c)$
 $
 $(7) $(111) $(438)
Net income (loss) attributable to common stockholders$833
 $(556) $(273) $930
 $(838)
Income (loss) from continuing operations attributable to common stockholders per share:         
Basic$4.86
 $(3.34) $(1.79) $7.17
 $(2.94)
Diluted$4.85
 $(3.34) $(1.79) $7.15
 $(2.94)
Net income (loss) attributable to common stockholders per share:         
Basic$4.86
 $(3.34) $(1.83) $6.40
 $(6.16)
Diluted$4.85
 $(3.34) $(1.83) $6.38
 $(6.16)
Dividends declared per share$0.08
 $0.08
 $0.08
 $0.08
 $0.08
Balance Sheet Data (as of December 31):         
Total assets$17,003
 $16,459
 $15,154
 $14,909
 $12,272
Long-term obligations$3,596
 $4,482
 $5,317
 $4,901
 $4,426
Total equity$11,279
 $10,411
 $8,375
 $8,589
 $6,615
______________________
(a)Includes revisions to present certain of the Company's purchased oil and gas and sales of purchased oil and gas on a net basis within purchased oil and gas expense. See Note B of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the revision of the Company's revenues and expenses associated with these transactions.
(b)During 2017, 2016, 2015 and 2013, the Company recognized impairment charges of $285 million related to dry gas properties in the Raton field, $32 million related to oil and gas properties in the West Panhandle field, $1.1 billion related to oil and gas properties in the West Panhandle, South Texas - Other and South Texas - Eagle Ford Shale fields and $1.5 billion related to dry gas properties in the Raton field, respectively. See "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" and Note D of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's impairment charges.
(c)The Company recognized impairment charges of (i) $305 million attributable to its Hugoton assets, its Barnett Shale assets and Pioneer Alaska in 2014 and (ii) $729 million attributable to its Barnett Shale assets and Pioneer Alaska in 2013. The results of these operations are classified as discontinued operations in accordance with GAAP.


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ITEM 7.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS
OF OPERATIONS
ITEM 7.MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
Financial and Operating Performance
Pioneer's financial and operating performance for 20172020 included the following highlights:
Net incomeloss attributable to common stockholders was $833$200 million ($4.851.21 per diluted share) for the year ended December 31, 2017,2020, as compared to a net lossincome of $556$773 million ($3.344.59 per diluted share) in 2016.2019. The primary components of the $1,389$973 million increasedecrease in earningsnet income (loss) attributable to common stockholders include:
a $1.1$1.3 billion increasedecrease in oil and gas revenues, asprimarily due to a result a 2531 percent increasedecrease in average realized commodity prices per BOE, combined withpartially offset by a 16six percent increase in daily sales volumes;volumes due to the Company's successful horizontal drilling program in the Permian Basin;
a $206$522 million decrease in net sales of purchased commodities due to a decrease in margins on the Company's downstream Gulf Coast refinery and export oil sales;
a $336 million decrease in derivative results, primarily due to changes in forward commodity prices and the cash settlement of derivative positions in accordance with their terms; and
a $143 million decrease in interest and other income (loss), primarily related to noncash valuation adjustments associated with the Company's investment in an affiliate, net proceeds received in 2019 from the sale of the Company's investment in its corporate headquarters and a decrease in interest income.
Partially offset by:
a $486 million increase in net gainsthe gain (loss) on disposition of assets (from a net loss on disposition of assets in 2019 to a net gain on disposition of assets in 2020), primarily due to recognizing a gain of $194 millionthe 2019 net loss recorded on the sale of approximately 20,500 acres in the Martin County regiondivestiture of the Permian Basin during 2017;Company's Eagle Ford assets and other remaining South Texas assets in May 2019 (the "South Texas Divestiture");
a $121$296 million increasereduction in income taxes primarily due to the decrease in earnings between 2020 and 2019;
a $249 million decrease in production costs, including taxes, primarily attributable to (i) the Company's income tax benefit, primarilycost saving initiatives to lower production costs and (ii) the reduction in production taxes as a result of the aforementioned 31 percent decrease in average realized commodity prices per BOE;
a $127 million decrease in other expense, primarily related to decreases of (i) $80 million in employee-related charges associated with the 2020 and 2019 corporate restructurings and the Company's 2020 staffing reduction in deferred tax liabilitiesits well services business, (ii) $83 million related to the reductionasset divestitures, decommissioning and impairments, (iii) $58 million in firm transportation charges on excess pipeline capacity commitments and (iv) $42 million in corporate headquarters relocation-related costs, partially offset by increases of (i) $80 million in the federalCompany's net forecasted deficiency fee obligation and receivable associated with the South Texas Divestiture, (ii) $55 million in idle frac fleet fees, stacked drilling rig charges and drilling rig early terminations charges and (iii) $27 million in early extinguishment of debt charges;
an $80 million decrease in general and administrative expense primarily due to (i) the effect of the Company's 2019 and 2020 corporate income tax rate beginningrestructurings, which resulted in 2018;employee headcount reductions and decreased salaries and benefits and (ii) the Company's reduction of additional overhead related costs during 2020 through voluntary salary reductions by the Company's officers and board of directors, reductions in estimated cash incentive compensation, benefit reductions and other cash cost reductions as a result of the Company's response to the COVID-19 pandemic's impact on oil demand and prices; and
an $80a $72 million decrease in DD&A expense, primarily attributabledue to (i) commodity price increases and the Company's cost reduction initiatives, both of which had the effect of adding proved reserves by lengthening the economic lives of the Company's producing wells and (ii) additions to proved reserves attributable to the Company's successful Spraberry/Wolfcamp horizontal drilling program;program.
a $61 million decrease in net derivative losses, primarily as a result of changes in forward commodity prices, the cash settlement of derivative positions in accordance with their terms and changes in the Company's portfolio of derivatives;
a $54 million decrease in interest expense, primarily due to the repayment of both the Company's 6.65% senior notes, which matured in March 2017, and the Company's 5.875% senior notes, which matured in July 2016;
a $44 million decrease in other expense, primarily related to reductions in idle drilling and well service equipment charges and net losses from Company-provided fracture stimulation and related service operations that are provided to third party working interest owners, partially offset by an increase in unused firm transportation costs;
a $33 million decrease in losses associated with purchases and sales of oil and gas used to fulfill transportation commitments;
a $21 million increase in interest and other income, primarily due to interest received from the Company's short-term and long-term investments and severance tax refunds; and
a $13 million decrease in exploration and abandonment charges, primarily due to writing off the Company's unproved acreage in Alaska during 2016 when it was determined that it was no longer expected to be developed; partially offset by
a $253 million increase in impairment charges, principally related to the impairment charge recorded in 2017 to reduce the carrying value of the Company's Raton field; and
an $89 million increase in total oil and gas production costs and production and ad valorem taxes as of a result of the aforementioned increases in commodity prices and sales volumes.
During 2017,2020, average daily sales volumes increased on a BOE basis by 16six percent to 272,330367,253 BOEPD, as compared to 233,842345,518 BOEPD during 2016,2019, primarily due to the Company's successful Spraberry/Wolfcamp horizontal drilling program.
Average oil and NGL and gas prices increased during 2017 to $48.24decreased per Bbl $19.31 per Bblin 2020 to $37.24 and $2.63 per Mcf,$15.62, respectively, as compared to $39.65 per Bbl, $13.49 per Bbl$53.77 and $2.11$19.33, respectively, in 2019. Average gas prices decreased per Mcf respectively in 2016.
Net cash provided by operating activities increased by 39 percent2020 to $2.1 billion for 2017,$1.73 as compared to $1.5 billion during 2016, primarily due to increases$1.79 in 2019.
Parsley Acquisition
The Company completed the Parsley Acquisition on January 12, 2021. Parsley's results of operations will be consolidated with the Company's oilinterim consolidated financial statements beginning on January 12, 2021. See Item 1.
Business - Acquisition Activities" and gas revenuesNote 19 of Notes to Consolidated Financial Statements included in 2017 as a result of increases in commodity prices"Item 8. Financial Statements and sales volumes, partially offset by a $613 million reduction in cash provided by commodity derivatives.Supplementary Data" for additional information.
First Quarter 20182021 Outlook
The first quarter of 2021 is expected to continue to have a high degree of uncertainty related to how long it will take to return to a balanced oil supply and demand environment. As a result, the Company's future operating and financial results will depend on various factors beyond the Company's control, such as: the duration of the COVID-19 pandemic and the speed and effectiveness of vaccine distributions to combat the virus, which is expected to directly impact the recovery of world economic growth and the demand for oil; the impact of U.S. energy, monetary, environmental and trade policies; fiscal challenges facing the United States federal government; geopolitical issues globally, especially in the Middle East; the extent to which OPEC members and some nonmembers, including Russia, adhere to and agree to extend cuts to their oil production quotas; and uncertainty in oil demand fundamentals associated with governmental policy aimed at redirecting fossil fuel consumption towards lower carbon energy.
Based on current estimates, the Company expects the following operating and financial results for the first quarter ending March 31, 2018:of 2021, which includes the effects of the Parsley Acquisition (from the date of acquisition) and the February 2021 winter storms in West Texas:
Production is forecasted to average 304,000 to 314,000 BOEPD.

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Production costs (including production and ad valorem taxes and transportation costs) are expected to average $7.00 to $9.00
Three Months Ending March 31, 2021
Preliminary Guidance
($ in millions, except per BOE amounts)
Average daily production (MBOE)444 - 470
Average daily oil production (MBbls)259 - 274
Production costs per BOE$6.50 - $8.00
DD&A per BOE$11.25 - $13.25
Exploration and abandonments expense$10 - $20
General and administrative expense$65 - $75
Accretion of discount on asset retirement obligations$2 - $5
Interest expense$38 - $43
Other expense$10 - $20
Cash flow impact from firm transportation (a)$(60) - $(30)
Current income tax provision (benefit)<$5
Effective tax rate21% - 25%
_____________________
(a)The cash flow impact from firm transportation is primarily based on current NYMEX strip commodity prices. DD&A expense is expectedthe forecasted differential between WTI oil prices and Brent oil prices less the costs to average $12.50transport purchased oil from the areas of the Company's production to $14.50 per BOE.the Gulf Coast. To the extent that the Company's Gulf Coast sales of purchased oil does not cover the purchase price and associated firm transport costs, the Company's results of operations will reflect the negative cashflow impact attributable to its firm transportation commitments.
Total explorationDuring February 2021, the Company's operations in West Texas were significantly impacted by winter weather that brought abnormally cold temperatures, along with snow and abandonment expenseicy conditions across the state of Texas. The extreme winter weather impacted production operations, midstream infrastructure and power providers throughout the state, along with many other services. As a result, most of the Company's production was offline for about a week. Early in the weather event, the Company attempted to perform or otherwise satisfy its firm gas sales commitments, but as the impacts of the winter weather became clearer, the Company subsequently issued force majeure notices to its customers given the inability to perform such contracts for a variety of reasons, including significant production being offline, interruptions to midstream operations, the inability to flow gas to markets due to infrastructure downtime and compliance with government orders to direct any available gas volumes towards supporting power generation. Certain of the Company's customers have alleged that the Company's force majeure notices were improper under the applicable contracts. The Company estimates that it incurred incremental cash costs of $75 million to $85 million in connection with its firm gas sales commitments early in the weather event.
2021 Capital Budget
The Company's capital budget for 2021 is expected to be $20 millionin the range of $2.5 billion to $30 million. General and administrative expense is expected to be $80 million to $85 million. Interest expense is expected to be $33 million to $38 million, and other expense is expected to be $60 million to $70 million, including $45 million to $55 million of charges associated with excess firm gathering and transportation commitments. Accretion of discount on asset retirement obligations is expected to be $4 million to $7 million.
The Company's effective income tax rate is expected to range from 21 percent to 25 percent, reflecting the lower federal corporate income tax rate enacted by the Tax Cuts and Jobs Act. Cash income taxes are expected to be less than $5 million.
2018 Capital Budget
Pioneer's capital budget for 2018 totals $2.9$2.8 billion, consisting of $2.3 billion to $2.6 billion for drilling and completion related activities, including additional tank batteries and saltwater disposal facilities, $100 million of estimated Parsley integration costs and gas processing facilities, and $260$90 million for water infrastructure, vertical integration, field facilitieswell services and vehicles. The 20182021 capital budget excludes acquisitions, asset retirement obligations, capitalized interest and geological and geophysical general and administrative expense and information technology system upgrades.corporate facilities.

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The 2018 drilling and completion capital of $2.6 billion is focused on oil drilling, with approximately 99 percent of the capital allocated to horizontal drilling activities in the Spraberry/Wolfcamp field. The following is the forecasted spending by asset area:
Spraberry/Wolfcamp field - $2.6 billion, including (i) $2.0 billion of horizontal drilling capital, (ii) $300 million for infrastructure (additional tank batteries and saltwater disposal facilities), (iii) $170 million for gas processing facilities and (iv) $110 million of land, science and other expenditures; and
Other assets - $20 million.    
The 20182021 capital budget is expected to be funded from a combination of operating cash flow, and, if necessary, from cash and cash equivalents on hand sales of short-term and long-term investments and, if necessary, proceeds from planned asset divestitures or borrowings under the Company's credit facility.
AcquisitionsDivestitures, Decommissioning and Restructuring Activities
During 2017, 2016 and 2015, the Company spent $136 million, $446 million and $36 million, respectively, to acquire primarily undeveloped acreage for future exploitation and exploration activities in the Spraberry/Wolfcamp field of the Permian Basin. During 2016,Divestitures.
In May 2020, the Company completed the acquisitionsale of certain vertical wells and approximately 28,000 net1,500 undeveloped acres in Upton County of the Permian Basin with net production of approximately 1,400 BOEPD, fromto an unaffiliated third party for $428net cash proceeds of $6 million. The Company recorded a gain of $6 million associated with the sale.
In December 2019, the Company completed the sale of certain vertical and horizontal wells and approximately 4,500 undeveloped acres in Glasscock County of the Permian Basin to an unaffiliated third party for net cash proceeds of $64 million. The Company recorded a gain of $10 million associated with the sale.
In July 2019, the Company completed the sale of certain vertical wells and approximately 1,400 undeveloped acres in Martin County of the Permian Basin to an unaffiliated third party for net cash proceeds of $27 million. The Company recorded a gain of $26 million associated with the sale.
In June 2019, the Company completed the sale of certain vertical wells and approximately 1,900 undeveloped acres in Martin County of the Permian Basin to an unaffiliated third party for net cash proceeds of $38 million. The Company recorded a gain of $31 million associated with the sale.
In May 2019, the Company completed the South Texas Divestiture to an unaffiliated third party in exchange for total consideration having an estimated fair value of $210 million. The fair value of the consideration included (i) net cash proceeds of $2 million, (ii) $136 million in contingent consideration and (iii) a $72 million receivable associated with estimated deficiency fees to be paid by the buyer. The Company recorded a loss of $525 million and recognized employee-related charges of $19 million associated with the sale.
Contingent Consideration. Per the terms of the South Texas Divestiture, the Company was entitled to receive contingent consideration based on future annual oil and NGL prices during each of the five years from 2020 to 2024. The Company revalued the contingent consideration using an option pricing model each reporting period prior to the settlement of the contingent consideration in July 2020 when the Company received cash proceeds of $49 million from the buyer to fully satisfy the contingent consideration. The Company recorded a noncash loss of $42 million to interest and other income during the year ended December 31, 2020 associated with the settlement.
Deficiency Fee Obligation. The Company transferred its long-term midstream agreements and associated minimum volume commitments ("MVC") to the buyer. However, the Company retained the obligation to pay 100 percent of any deficiency fees associated with the MVC from January 2019 through July 2022. The Company determines the fair value of the deficiency fee obligation using a probability weighted discounted cash flow model. The deficiency fee obligation is included in current or noncurrent liabilities in the consolidated balance sheets, based on the estimated timing of payments. During the year ended December 31, 2020, the Company recorded a charge of $84 million in other expense in the consolidated statements of operations, to increase the Company's forecasted deficiency fee payments as a result of a reduction in planned drilling activities by the buyer of the assets. The estimated remaining deficiency fee obligation was $333 million as of December 31, 2020.
Deficiency Fee Receivable. The buyer is required to reimburse the Company for 18 percent of the deficiency fees paid under the transferred midstream agreements from January 2019 through July 2022. Such reimbursement will be paid by the buyer in installments beginning in 2023 through 2025. The Company determines the fair value of the deficiency fee receivable using a credit risk-adjusted valuation model. During the year ended December 31, 2020, the Company recorded an increase to the Company's long-term deficiency fee receivable of $4 million in other expense in the consolidated statements of operations, to reflect the buyer's share of 2020 deficiency fees which were greater than originally forecasted as of the date of the sale. The deficiency fee receivable is included in noncurrent other assets in the consolidated balance sheets.
Decommissioning.
In November 2018, the Company announced plans to close its sand mine located in Brady, Texas and transition its proppant supply requirements to West Texas sand sources.
During 2019, the Company recorded $23 million of accelerated depreciation, $13 million of inventory and other property and equipment impairment charges and $12 million of sand mine closure-related costs.

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During 2018, the Company recorded $443 million of accelerated depreciation and $7 million of employee-related charges associated with the shutdown.
Restructuring.
During the third quarter of 2020, the Company announced a corporate restructuring to reduce its staffing levels to correspond with a planned reduction in future activity levels. The restructuring resulted in approximately 300 employees being involuntarily separated from the Company in October 2020. The Company recorded $78 million of employee-related charges, including $5 million of noncash stock-based compensation expense related to the accelerated vesting of certain equity awards, in other expense in the consolidated statements of operations during the year ended December 31, 2020. See Note C3,Note 8 and Note 16 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
In June 2020, the Company implemented changes to its well services business, including a staffing reduction of approximately 50 employees. The changes were made to more closely align the well services cost structure and headcount with the Company's reduction in expected activity levels as a result of the COVID-19 pandemic's impact on oil prices. The Company recorded $1 million of employee-related charges in other expense in the consolidated statements of operations during the year ended December 31, 2020 related to the staffing reductions in its well services business.
During 2019, the Company implemented a corporate restructuring to align its cost structure with the needs of a Permian Basin-focused company (the "2019 Corporate Restructuring Program"). The 2019 Corporate Restructuring Program occurred in three phases as follows:
In March 2019, the Company made certain changes to its leadership and organizational structure, which included the early retirement and departure of certain officers of the Company,
In April 2019, the Company adopted a voluntary separation program ("VSP") for certain eligible employees, and
In May 2019, the Company implemented an involuntary separation program ("ISP").
During 2019, the Company recorded $159 million of employee-related charges, including $26 million of noncash stock-based compensation expense related to the accelerated vesting of certain equity awards, associated with the 2019 Corporate Restructuring Program.
See Note 3 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's acquisitions.regarding Divestitures, Decommissioning and Restructuring activities.
Divestitures
In February 2018, the Company announced its intention to divest its properties in South Texas, Raton and the West Panhandle field and focus its efforts and capital resources to its Permian Basin assets. No assurance can be given that the sales will be completed in accordance with the Company's plans or on terms and at prices acceptable to the Company.
In April 2017, the Company completed the sale of approximately 20,500 acres in the Martin County region of the Permian Basin, with net production of approximately1,500 BOEPD, to an unaffiliated third party for cash proceeds of $264 million. The sale resulted in a gain of $194 million. In conjunction with the divestiture, the Company reduced the carrying value of goodwill by $2 million, reflecting the portion of the Company's goodwill related to the assets sold.
In July 2015, the Company completed the sale of its 50.1 percent equity interest in EFS Midstream to an unaffiliated third party, with the Company receiving total consideration of $1.0 billion, of which $530 million was received at closing and the remaining $501 million was received in July 2016. The Company recorded a net gain on the disposition of $777 million in September 2015.
See Notes C, D and Q of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information about the Company's divestitures in 2017 and 2015 and it's planned divestitures of South Texas, Raton and the West Panhandle field.

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Results of Operations
Results of operations should be read together with the Company's consolidated financial statements and related notes included in "Item 8. Financial Statements and Supplementary Data" of this Annual Report on Form 10-K. See the Company's Annual Report on Form 10-K for the year ended December 31, 2019 for a discussion of the Company's 2019 results of operations as compared to the Company's 2018 results of operations.
Oil and gas revenues. Oil and gas The Company's revenues totaled $3.5 billion, $2.4 billion and $2.2 billion during 2017, 2016 and 2015, respectively.
The increase in 2017 oil and gas revenues relative to 2016 is primarily due to increasesare derived from sales of 19 percent, 26 percent and 4 percent in oil, NGL and gas sales volumes, respectively,production. Increases or decreases in the Company's revenues, profitability and increases of 22 percent, 43 percentfuture production are highly dependent on commodity prices. Prices are market driven and 25 percent in oil, NGL and gasfuture prices respectively.
The increase in 2016 oil and gas revenues relative to 2015 is primarilywill fluctuate due to increasessupply and demand factors, availability of 27 percenttransportation, seasonality, geopolitical developments and 13 percent in oil and NGL sales volumes, respectively, partially offset by a six percent decline in gas sales volumes and declineseconomic factors, among other items.
Year Ended December 31,
20202019Change
(in millions)
Oil and gas revenues$3,630 $4,916 $(1,286)

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Average daily sales volumes in 2017are as follows:
 Year Ended December 31,
 20202019% Change
Oil (Bbls)210,641 212,353 (1 %)
NGLs (Bbls)85,728 72,323 19 %
Gas (Mcf) (a)425,307 365,055 17 %
Total (BOE)367,253 345,518 %
____________________
(a)Gas production excludes gas produced and 2016used as field fuel.
Average daily sales volumes per BOE increased by 16 percent and 15 percent, respectively,for the year ended December 31, 2020, as compared to the average daily sales volumes in the respective prior years, principally2019, primarily due to the Company's successful Spraberry/Wolfcamp horizontal drilling program. The increase in NGL and gas volumes primarily reflects (i) increasing wet gas production (as a percentage of a horizontal wells total production) over time, (ii) new processing facilities and takeaway capacity being placed into service during 2019 and 2020, which had the effect of lowering line pressures and (iii) increased recovery rates for NGLs. The decrease in oil volumes for the year ended December 31, 2020, as compared to 2019, was primarily due to the Company's reduced drilling and completion activity and proactively curtailing lower-margin, higher-cost vertical well production during 2020 as a result of the reduced oil price environment.
The following table provides average daily sales volumes from continuing operations for 2017, 2016 and 2015:
 Year Ended December 31,
 2017 2016 2015
Oil (Bbls)158,571
 133,677
 105,347
NGLs (Bbls)55,008
 43,504
 38,592
Gas (Mcf) (a)352,507
 339,966
 360,662
Total (BOE)272,330
 233,842
 204,050
_____________________
(a)Gas production excludes gas produced and used as field fuel.
The oil, NGL and gas prices thatreported by the Company reports are based on the market prices received for the commodities.each commodity. The following table provides the Company's average prices from continuing operations for 2017, 2016 and 2015:
are as follows:
 Year Ended December 31,
 2017 2016 2015
Oil (per Bbl)$48.24
 $39.65
 $43.55
NGLs (per Bbl)$19.31
 $13.49
 $13.31
Gas (per Mcf)$2.63
 $2.11
 $2.40
Total (per BOE)$35.39
 $28.25
 $29.25
 Year Ended December 31,
 20202019% Change
Oil per Bbl$37.24 $53.77 (31 %)
NGLs per Bbl$15.62 $19.33 (19 %)
Gas per Mcf$1.73 $1.79 (3 %)
Total per BOE$27.01 $38.98 (31 %)
Sales of purchased oil and gas. The Company periodically enters into pipeline capacity commitments in order to secure available oil, NGL and gas transportation capacity from the Company's areas of production. commodities. The Company enters into purchase transactions with third parties and separate sale transactions with third parties to diversify a portion of the Company's WTI oil and gas sales to a(i) Gulf Coast orrefineries, (ii) Gulf Coast and West Coast gas markets and (iii) international export market priceoil markets and to satisfy unused gas pipeline capacity commitments. Revenues and expenses from these transactions are generally presented on a gross basis as the Company acts as a principal in the transaction by assuming both the riskrisks and rewards of ownership, including credit risk, of the commodities purchased and the responsibility to deliver the commodities sold. In conjunction with the Company's downstream sales, the Company also enters into pipeline capacity commitments in order to secure available oil, NGL and gas transportation capacity from the Company's areas of production to downstream sales points. The transportation costs associated with these transactions are presented on a net basisincluded in purchased oil and gascommodities expense.
The net effect of third party purchases and sales of oil and gascommodities is as follows:
Year Ended December 31,
20202019Change
(in millions)
Sales of purchased commodities$3,394 $4,755 $(1,361)
Purchased commodities3,633 4,472 (839)
Net effect on earnings$(239)$283 $(522)
The $522 million decrease in net sales of purchased commodities for the year ended December 31, 2017 was a loss of $31 million,2020, as compared to 2019, is primarily due to (i) a $74 million loss during the first quarter of $64 million2020 attributable to oil that was purchased and in transit via pipeline to the Gulf Coast or in Gulf Coast storage at the end of January and February, and was subsequently sold in February 2020 and March 2020, respectively, at lower prices (this oil inventory is sold in the following month at contracted prices that are generally tied to monthly average index oil prices (typically Brent oil prices)) and (ii) a loss of $39 million fordecrease in 2020 margins on the years ended December 31, 2016Company's downstream Gulf Coast refinery and 2015, respectively. export oil sales.
Firm transportation payments on excess pipeline capacity are included in other expense in the accompanying consolidated statements of operations. See Note N16 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for further information on unused transportation commitment charges.additional information.

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Interest and other income.income (loss), net.
Year Ended December 31,
20202019Change
(in millions)
Interest and other income (loss), net$(67)$76 $(143)
The Company'sdecrease in interest and other income was $53 million for the year ended December 31, 2017,2020, as compared to $32 million and $22 million for the years ended December 31, 2016 and 2015, respectively. The increase in interest and other income during 2017 as compared to 2016 was2019, is primarily due to (i) an increasea noncash loss of $11$64 million attributable to the decrease in severance, salesfair value of the Company's investment in affiliate as compared to a noncash gain of $15 million for the same period in 2019, (ii) a net gain of $56 million related to the 2019 sale of the Company's investment in its corporate headquarters and property tax refunds and (ii) an increase of $10(iii) a $12 million decrease in interest income, on short-term and long-term investments. The increase in interest and other income during 2016 as compared to 2015 was primarily due to (i) an increase of $19 million in interest income on short-term and long-term investments, partially offset by (ii) a decrease of $5$7 million increase in equity interest in income of EFS Midstream. sales and use tax refunds.
See Note M15 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information aboutadditional information.
Derivative gain (loss), net.
Year Ended December 31,
20202019Change
(in millions)
Noncash derivative gain (loss), net$(325)$$(333)
Cash receipts on settled derivative instruments, net (a)44 47 (3)
Derivative gain (loss), net$(281)$55 $(336)
____________________
(a)Includes a $22 million loss related to interest rate derivatives for the Company's interest and other income.year ended December 31, 2020.

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Derivative gains (losses), net.The Company primarily utilizes commodity swap contracts, collar contracts, and collar contracts with short puts and basis swap contracts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, and (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. During the year ended December 31, 2017, theplans. The Company recorded $100 million of net derivative losses, comparedalso, from time to $161 million of net derivative losses and $879 million of net derivative gains for the years ended December 31, 2016 and 2015, respectively, on commodity price, diesel price,time, utilizes interest rate and marketing derivatives. Forcontracts to reduce the years ended December 31, 2017, 2016 and 2015, the Company received net cash receiptseffect of $74 million, $690 million and $876 million, respectively, from its derivative activities.
The following table details the net cash receiptsinterest rate volatility on the Company's commodityindebtedness.
Commodity derivatives and the relative price impact (per Bbl or Mcf)are as follows:
Year Ended December 31,
20202019
Net Cash Receipts (Payments)Price ImpactNet Cash Receipts (Payments)Price Impact
(in millions)(in millions)
Oil derivative receipts (a)$80 $1.03 per Bbl$75 $0.97 per Bbl
Gas derivative payments (b)(3)$(0.02)per Mcf(28)$(0.21)per Mcf
Total net commodity derivative receipts$77 $47 
_____________________
(a)Excludes the effect of liquidating certain of the Company's 2020 and 2021 Brent collar contracts with short puts for cash payments of $11 million for the yearsyear ended December 31, 2017, 2016 and 2015:2020.
(b)Excludes the effect of liquidating certain of the Company's 2021 NYMEX swap contracts for cash receipts of $1 million for the year ended December 31, 2020.
  Year Ended December 31,
  2017 2016 2015
  Net cash receipts (payments) Price impact Net cash receipts Price impact Net cash receipts Price impact
  (in millions)    (in millions)    (in millions)   
Oil derivative receipts $67
 $1.15
per Bbl $609
 $12.42
per Bbl $744
 $19.36
per Bbl
NGL derivative receipts (payments) (1) $(0.06)per Bbl 5
 $0.30
per Bbl 18
 $0.79
per Bbl
Gas derivative receipts (payments) 2
 $0.02
per Mcf 67
 $0.54
per Mcf 114
 $0.87
per Mcf
Total net commodity derivative receipts $68
    $681
    $876
   
The Company's open derivative contracts are subject to continuing market risk. See "Item"Item 7A. Quantitative and Qualitative Disclosures About Market Risk"Risk" and Note E5 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's derivative contracts.additional information.
Gain (loss) on disposition of assets, net. The Company recorded net gains on the disposition
Year Ended December 31,
20202019Change
(in millions)
Gain (loss) on disposition of assets, net$$(477)$486 

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Table of assets of $208 million, $2 million and $782 million during the years ended December 31, 2017, 2016 and 2015, respectively. For the year ended December 31, 2017, theContents
PIONEER NATURAL RESOURCES COMPANY
The Company's gain (loss) on disposition of assets is primarily due to a gain of $194 million recognized on the sale of approximately 20,500 acres in the Martin County region of the Permian Basin. For the year ended December 31, 2015, the Company's gains on disposition of assets are primarily dueattributable to the gain of $777 million recognized on the sale of EFS Midstream. following divestitures:
Asset SoldCompletion DateNet Gain (Loss) Recorded
(in millions)
Year Ended December 31, 2020:
Upton County - Permian Basin acreage and wellsMay 2020$
Other$
Year Ended December 31, 2019:
Martin County - Permian Basin acreageJune/July 2019$57 
South Texas DivestitureMay 2019$(525)
Other$(9)
See Note C3 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary DataData" for additional information regarding the Company's net gains on disposition of assets.information.
Oil and gas production costs. The Company recognized oil and gas
Year Ended December 31,
20202019Change
(in millions)
Oil and gas production costs$682 $874 $(192)
Total production costs from continuing operations of $591 million, $581 million and $717 million for the years ended December 31, 2017, 2016 and 2015, respectively. per BOE are as follows:
 Year Ended December 31,
 20202019% Change
Lease operating expense (a)$3.00 $4.57 (34 %)
Gathering, processing and transportation expense (b)2.59 2.24 16 %
Workover costs (a)0.24 0.71 (66 %)
Net natural gas plant income (c)(0.76)(0.59)29 %
$5.07 $6.93 (27 %)
_____________________
(a)Lease operating expensesexpense and workover expensescosts represent the components of oil and gas production costs over which the Company has management control, while third partycontrol.
(b)Gathering, processing and transportation charges representexpense represents the costcosts to gather, process, fractionate and transport volumes producedthe Company's gas and NGLs to a sales point. their point of sale.
(c)Net natural gas plant/gathering charges representplant income represents the net costs toearnings from the Company's ownership share of gas processing facilities that gather and process the Company's gas, reduced by net revenues earned from gathering and processing of third party gas in Company-owned facilities.gas.
The following table provides the components of the Company's total production costsLease operating expense per BOE for 2017, 2016 and 2015:
 Year Ended December 31,
 2017 2016 2015
Lease operating expenses$4.58
 $5.02
 $7.24
Third party transportation charges0.85
 1.41
 1.60
Net natural gas plant (income) charges(0.28) 0.01
 0.16
Workover costs0.80
 0.35
 0.62
Total production costs$5.95
 $6.79
 $9.62
Total oil and gas production costs per BOEdecreased for the year ended December 31, 2017 decreased 12 percent2020, as compared to 2016. The decrease in lease operating expenses per BOE is2019, primarily due to (i) the Company's cost saving initiatives to lower production costs and (ii) the impact of the sale of the Company's South Texas assets in May 2019, which had a greaterhigher lease operating expense per BOE than the Company's Permian Basin assets. Gathering, processing and transportation expense per BOE increased due to a higher proportion of the Company's total production coming from horizontal wells in the Spraberry/Wolfcamp area that have lower per BOE lease operatingbeing attributable to gas and NGL production, higher NGL recoveries and incremental costs associated with new processing facilities and pipeline takeaway capacity for the Company's cost reduction initiatives. The decrease in third party transportationgas and NGL production. Workover costs per BOE isdecreased primarily due to reduced workover activity as a result of lower proportioncommodity prices being realized in 2020, which reduced the economic benefit of repairing many of the Company's marginal vertical wells. Net natural gas plant income per BOE increased primarily due to new processing facilities brought online in 2019 and 2020 that resulted in higher NGL recoveries and reduced plant operating expenses.

Production and ad valorem taxes.
Year Ended December 31,
20202019Change
(in millions)
Production and ad valorem taxes$242 $299 $(57)
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total production being subject to higher Eagle Ford Shale transportation costs. The net natural gas plant income per BOE is primarily reflective of increased earnings on third party volumes that are processed in the Company-owned facilities due to higher NGL and gas prices. The increase in workover costs per BOE was primarily due to an increase in Permian vertical well workover activity due to the improvement in commodity prices.
Total oil and gas production costs per BOE for the year ended December 31, 2016 decreased 29 percent as compared to 2015. The decrease in lease operating expenses per BOE is also primarily due to a greater proportion of the Company's production coming from horizontal wells in the Spraberry/Wolfcamp area that have lower per BOE lease operating costs, cost reduction initiatives and lower electricity and fuel costs, which are impacted by lower commodity prices. The decline in workover costs per BOE was primarily due to reduced workover activity on the older vertical wells, as such activity was generally uneconomical as a result of the lower commodity price environment.
Production and ad valorem taxes. The Company recorded production and ad valorem taxes of $215 million during 2017, as compared to $136 million and $145 million for 2016 and 2015, respectively. In general, production taxes and ad valorem taxes are directly related to commodity price changes; however, Texas ad valorem taxes are based upon prior year commodity prices, whereas production taxes are based upon current year commodity prices. The increase in production
Production and ad valorem taxes per BOE are as follows:
 Year Ended December 31,
 20202019% Change
Production taxes$1.17 $1.75 (33 %)
Ad valorem taxes0.64 0.63 %
$1.81 $2.38 (24 %)
Production taxes per BOE decreased for the year ended December 31, 2020, as compared to 2019, primarily due to the decrease in oil and NGL prices.
Depletion, depreciation and amortization ("DD&A") expense.
Year Ended December 31,
20202019Change
(in millions)
Depletion, depreciation and amortization$1,639 $1,711 $(72)
Total DD&A expense per BOE is as follows:
 Year Ended December 31,
 20202019% Change
DD&A$12.19 $13.56 (10 %)
Depletion expense$11.55 $12.78 (10 %)
The decrease in DD&A per BOE and depletion expense per BOE for the year ended December 31, 20172020, as compared to 2016,2019, is primarily due to the increase in commodity prices during 2017 and, for ad valorem tax purposes, the higher valuation attributable to the Company's successful Spraberry/Wolfcamp horizontal drilling program in 2017. The decrease in production and ad valorem taxes per BOE for the year ended December 31, 2016 as compared to 2015 is primarily due to the decrease in commodity prices during 2016.
The following table provides the Company's production and ad valorem taxes per BOE for 2017, 2016 and 2015:
 Year Ended December 31,
 2017 2016 2015
Production taxes$1.59
 $1.14
 $1.19
Ad valorem taxes0.57
 0.46
 0.76
Total ad valorem and production taxes$2.16
 $1.60
 $1.95
Depletion, depreciation and amortization expense. The Company's total DD&A expense was $1.4 billion ($14.08 per BOE), $1.5 billion ($17.29 per BOE), and $1.4 billion ($18.59 per BOE) for 2017, 2016 and 2015, respectively. Depletion expense on oil and gas properties, the largest componentadditions of DD&A expense, was $13.61, $16.77 and $18.01 per BOE during 2017, 2016 and 2015, respectively.
Depletion expense on oil and gas properties for the year ended December 31, 2017 decreased 19 percent as compared to 2016. The decrease is primarily due to (i) additions to proved reserves attributable to the Company's successful Spraberry/Wolfcamp horizontal drilling programprogram.
Exploration and (ii) commodity price increases and cost reduction initiatives, both of which had the effect of adding proved reserves by lengthening the economic lives of the Company's producing wells.abandonments expense.
Depletion expense on oil and gas properties was $16.77 during 2016, as compared to $18.01 during 2015.
 Year Ended December 31,
 20202019Change
(in millions)
Geological and geophysical$36 $49 $(13)
Exploratory/extension well costs— (4)
Leasehold abandonments and other11 
$47 $58 $(11)
The seven percent decrease in per BOE depletion expense, as compared to that of 2015 was primarily due to (i) reserve additions attributable to the Company's successful drilling activitiesgeological and (ii) cost reduction initiatives that lowered expected lease operating expense, which had the effect of adding reserves by lengthening the economic life of the Company's producing wells.
Impairment of oil and gas properties and other long-lived assets. The Company recorded impairment expense to reduce the carrying values of oil and gas properties by $285 million, $32 million and $1.1 billion during the years ended December 31, 2017, 2016 and 2015.
The Company performs assessments of its long-lived assets to be held and used, including oil and gas properties, whenever events or circumstances indicate that the carrying values of those assets may not be recoverable. In order to perform these assessments, management uses various observable and unobservable inputs, including management's outlooksgeophysical costs for (i) proved reserves and risk-adjusted probable and possible reserves, (ii) commodity prices, (iii) production costs, (iv) capital expenditures and (v) production. Management's long-term commodity price outlooks are developed based on third party longer-term commodity futures price outlooks as of a measurement date ("Management's Price Outlooks").
As a result of the Company's impairment assessments, the Company recognized pretax, noncash impairment charges to reduce the carrying values of (i) the Raton field ($285 million) during the year ended December 31, 2017,2020, as compared to 2019, is primarily due to a decrease in geological and geophysical personnel costs as a result of (i) the 2020 cost reduction initiatives in response to the COVID-19 pandemic, (ii) the West Panhandle field ($32 million) during the year ended December 31, 20162020 Corporate Restructuring and (iii) the Eagle Ford Shale field ($846 million),2019 Corporate Restructuring Program (collectively the West Panhandle field ($138 million)"2019 and 2020 Overhead Cost Reduction Initiatives"). The increase in leasehold abandonment costs is primarily due to the South Texas - Other field ($72 million) duringabandonment of certain unproved properties that the year ended December 31, 2015.Company no longer plans to drill before the leases expire.

During 2020 and 2019, the Company completed and evaluated 242 and 281 exploration/extension wells, respectively, and 100 percent and 96 percent, respectively, were successfully completed as discoveries.
See Note 6 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
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General and administrative expense.
It
Year Ended December 31,
20202019Change
(in millions)
Noncash general and administrative expense$42 $53 $(11)
Cash general and administrative expense202 271 (69)
$244 $324 $(80)
Total general and administrative expense per BOE is reasonably possible thatas follows:
 Year Ended December 31,
 20202019% Change
Noncash general and administrative expense$0.31 $0.42 (26 %)
Cash general and administrative expense1.51 2.15 (30 %)
$1.82 $2.57 (29 %)
The decrease in noncash general and administrative expense per BOE for the year ended December 31, 2020, as compared to 2019, is primarily due to market fluctuations in the Company's estimatedeferred compensation obligation as a result of undiscounted future netmark-to-market valuation changes attributable to the Company's deferred compensation plan assets and a decrease in employee share-based compensation amortization due to reduced staffing levels associated with the 2019 and 2020 Overhead Cost Reduction Initiatives.
The decrease in cash flows may changegeneral and administrative expense per BOE for the year ended December 31, 2020, as compared to 2019, is primarily due to a decrease in corporate staffing levels and the Company's 2019 and 2020 Overhead Cost Reduction Initiatives.
See Note 3 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
Interest expense.
Year Ended December 31,
20202019Change
(in millions)
Noncash interest expense$51 $$42 
Cash interest expense78 112 (34)
$129 $121 $
The increase in noncash interest expense for the year ended December 31, 2020, as compared to 2019, is primarily due to (i) amortization of the discount attributable to the issuance of convertible senior notes in May 2020 that was recorded to additional paid-in capital in the future resultingaccompanying consolidated balance sheets and (ii) accretion associated with the Company's corporate headquarters that was capitalized as a finance lease in November 2019.
The decrease in cash interest expense is primarily due to the need to impairrepayment of $450 million of 7.50% senior notes that matured in January 2020 and the carrying valuesCompany's partial repayment of $360 million of its properties. 3.45% senior notes due 2021, $356 million of its 3.95% senior notes due 2022 and $9 million of its 7.20% senior notes due 2028 as a result of the Company's tender offer for these notes in May 2020, partially offset by the issuance in May 2020 and August 2020, respectively, of $1.3 billion of 0.25% convertible senior notes due 2025 and $1.1 billion of 1.90% senior notes due 2030.
The primary factors that may affect estimates of futureweighted average cash flows are (i) future reserve adjustments, both positiveinterest rate on the Company's indebtedness for the year ended December 31, 2020 decreased to 2.2 percent, as compared to 5.0 percent for the year ended December 31, 2019.
See Note 2 and negative, to proved reserves and risk-adjusted probable and possible reserves (ii) results of future drilling activities, (iii) changes in Management's Price Outlooks and (iv) increases or decreases in production and capital costs associated with these fields.
See Notes B and DNote 7 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information aboutand for the Company's impairment assessments.assessment of the impact of the adoption of Accounting Standards Codification 2020-06, "Debt-Debt with Conversion and Other Options (Subtopic 470-20) and Derivative and Hedging-Contracts in Entity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity".
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Other expense.
Year Ended December 31,
20202019Change
(in millions)
Other expense$321 $448 $(127)
The following table provides the Company's geological and geophysical costs, exploratory dry holes expense and leasehold abandonments anddecrease in other exploration expense for 2017, 2016 and 2015 (in millions):
 Year Ended December 31,
 2017 2016 2015
Geological and geophysical$84
 $77
 $71
Exploratory well costs10
 1
 17
Leasehold abandonments and other12
 41
 11
 $106
 $119
 $99
During 2017, the Company's exploration and abandonment expense was primarily attributableyear ended December 31, 2020, as compared to $84 million of geological and geophysical costs, of which $66 million was geological and geophysical administrative costs, $10 million associated with unsuccessful exploration wells and $12 million of leasehold abandonment expense and other. During 2017, the Company completed and evaluated 224 exploration/extension wells, 99 percent of which were successfully completed as discoveries.
During 2016, the Company's exploration and abandonment expense was primarily attributable to $77 million of geological and geophysical costs, of which $70 million was geological and geophysical administrative costs, and $41 million of leasehold abandonment expense, which included $32 million associated with unproved acreage in Alaska in which the Company held an overriding royalty interest. During 2016, the Company completed and evaluated 215 exploration/extension wells, all of which were successfully completed as discoveries.
During 2015, the Company's exploration and abandonment expense was primarily attributable to $71 million of geological and geophysical costs, of which $60 million was geological and geophysical administrative costs; $17 million of unsuccessful exploration wells,2019, is primarily related to drilling activities attributable to the Company's unproved acreage positiondecreases of (i) $80 million in southeast Colorado; and $11 million of leasehold abandonment expense, which includes $7 millionemployee-related charges associated with the 2019 and 2020 Overhead Cost Reduction Initiatives, (ii) $83 million related to asset divestitures, decommissioning and impairments, (iii) $58 million in firm transportation charges on excess pipeline capacity commitments and (iv) $42 million in corporate headquarters relocation-related costs, partially offset by increases of (i) $80 million in the Company's unproved acreage position in southeast Colorado. During 2015, the Company completednet forecasted deficiency fee obligation and evaluated 220 exploration/extension wells, 218 of which were successfully completed as discoveries.
General and administrative expense. General and administrative expense totaled $326 million ($3.28 per BOE), $325 million ($3.80 per BOE) and $327 million ($4.39 per BOE) during 2017, 2016 and 2015, respectively. The 2017 and 2016 decreases in general and administrative expense per BOE were primarily due to an increase in sales volumes of 16 percent and 15 percent, respectively, combinedreceivable associated with the Company's cost reduction initiatives, including not replacing personnel who have left the CompanySouth Texas Divestiture, (ii) $55 million in idle frac fleet fees, stacked drilling rig charges and reduced contractor activity.drilling rig early terminations charges and (iii) $27 million in early extinguishment of debt charges.
Accretion of discount on asset retirement obligations. Accretion of discount on asset retirement obligations was $19 million, $18 million and $12 million during the years ended December 31, 2017, 2016 and 2015, respectively. See Note I16 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's asset retirement obligations.information.
Interest expense. Interest expense was $153 million, $207 million and $187 million during 2017, 2016 and 2015, respectively. Income tax benefit (provision).
Year Ended December 31,
20202019Change
(in millions)
Income tax benefit (provision)$61 $(235)$296 
Effective tax rate23 %23 %— %
The decrease in interest expense during the year ended December 31, 2017, as compared 2016, was primarily due to the repayment of both the Company's 6.65% Senior Notes, which matured in March 2017, and the Company's 5.875% Senior Notes, which matured in July 2016. The increase in interest expense during the year ended December 31, 2016, as compared to 2015, was primarily due to incremental interest expense associated with the Company's December 2015 issuance of $500 million of 3.45% Senior Notes due 2021 and $500 million of 4.45% Senior Notes due 2026. The weighted average interest rate on the Company's indebtednessincome taxes for the year ended December 31, 2017 was 5.6 percent,2020, as compared to 6.0 percent and 6.9 percent for the years ended December 31, 2016 and 2015, respectively.2019, is primarily due to a decrease of $1.3 billion in income before income taxes.
See Note G17 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information aboutinformation.
Liquidity and Capital Resources
Liquidity. In response to the COVID-19 pandemic, the Company implemented measures to reduce, defer or cancel certain planned capital expenditures and reduce its overall cost structure commensurate with its expected level of activities. Additionally, as described in financing activities below, the Company enhanced its liquidity position by refinancing a portion of its existing debt and issuing new debt, with the combined objective of increasing liquidity, extending the Company's long-term debt maturities and interest expense.

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Other expense. Other expense was $244 million during 2017, as compared to $288 million during 2016 and $315 million during 2015. The $44 million decrease in other expense during 2017, as compared to 2016, was primarily due to (i) a decrease of $64 million in idle drilling and well service equipment charges and (ii) a decrease of $37 million in net losses from Company-provided fracture stimulation and related service operations that are provided to third party working interest owners, partially offset by (iii) an increase of $58 million in unused firm transportation costs.
The $27 million decrease in other expense during 2016, as compared to 2015, was primarily due to decreases of (i) $78 million in inventory and other property and equipment impairment charges, (ii) $28 million in idle drilling and well service equipment charges and (iii) $19 million in restructuring charges (see further information below), partially offset by increases of (iv) $56 million in unused firm transportation costs and (v) $20 million in net losses from Company-provided fracture stimulation and related service operations that are provided to third party working interest owners.
In February 2016, the Company announced plans to restructure its pressure pumping operations in South Texas, including relocating its two Eagle Ford Shale pressure pumping fleets to the Spraberry/Wolfcamp area. In connection therewith, the Company offered severance to certain employees and relocated a number of other employees from its South Texas locations to its operations in the Permian Basin. The initiative was substantially complete as of December 31, 2016. In connection therewith, the Company recognized $4 million of restructuring charges during the year ended December 31, 2016. The restructuring costs included $3 million in cash employee severance costs and $1 million in employee relocation and other costs.
In May 2015, the Company announced plans to restructure its operations in Colorado, including closing its office in Denver, Colorado and eliminating its Trinidad-based pressure pumping services operations. The restructuring plan was substantially complete as of December 31, 2015. In connection therewith, the Company recognized $23 million of restructuring charges during the year ended December 31, 2015, which includes approximately $17 million in employee severance costs and $6 million in office lease-related costs.
The Company expects to continue to incur charges associated with excess firm gathering and transportation commitments and vertical integration operations until commodity prices improve, allowing the Company to increase its drilling activities, or, in the case of gathering and transportation commitments, the contractual obligations expire.
See Notes B, J and N of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regardinglowering the Company's other expenses.
Income tax benefit. The Company recognized an income tax benefit attributable to earnings from continuing operations of $524 million during 2017, as compared to an income tax benefit of $403 million and $155 million during 2016 and 2015, respectively. The Company's effective tax ratefuture cash interest expense on earnings from continuing operations, excluding income from noncontrolling interest, for 2017 was a negative 170 percent for 2017 and 42 percent and 37 percent for 2016 and 2015, respectively, as compared to the combined United States federal and state statutory rates of approximately 36 percent.long-term debt.
The Company's effective tax rate for 2017 differsprimary sources of short-term liquidity are (i) cash and cash equivalents, (ii) net cash provided by operating activities, (iii) sales of investments, (iv) unused borrowing capacity under its credit facility (the "Credit Facility"), (v) issuances of debt or equity securities and (vi) other sources, such as sales of nonstrategic assets. In January 2021, Pioneer entered into the First Amendment to Credit Agreement, with the primary changes being to increase the aggregate loan commitments from $1.5 billion to $2.0 billion, extend the combined statutory rate primarily due to the enactment on December 22, 2017maturity of the Tax Cutscredit facility to January 12, 2026 and Jobs Act (the "Tax Reform Legislation"), which made significant changes to nominally adjust the United States federal income tax law. The most significant change affecting the Company was a reduction in the federal corporate income tax rate to 21 percent beginning January 1, 2018. This rate change resulted in a $625 million income tax benefit during 2017, primarily associated with the remeasurement of the Company's deferred tax liabilities at the new corporate tax rate as of December 31, 2017. Excluding the effects of the Tax Reform Legislation, the Company's effective tax rate for 2017 would have been 33 percent.drawn and undrawn pricing.
The effective rate for 2016 differs from the combined statutory rateCompany's short-term and long-term liquidity requirements consist primarily due to recognizing research and experimental expenditures credits of $72 million during 2016 and, to a lesser extent, state income tax apportionments and nondeductible expenses.
The Tax Reform Legislation also repealed corporate alternative minimum tax ("AMT") for tax years beginning in January 1, 2018, and provides that existing AMT credit carryovers are refundable beginning in 2018. As of December 31, 2017, the Company had AMT credit carryovers of $20 million that are expected to be fully refunded by 2022.
The Tax Reform Legislation preserves the deductibility of intangible drilling costs and provides for 100 percent bonus depreciation on personal tangible property expenditures through 2022. The bonus depreciation percentage is phased down from 100 percent beginning in 2023 through 2026.
The Tax Reform Legislation is a comprehensive bill containing other provisions, such as limitations on the deductibility of interest expense and certain executive compensation, that are not expected to materially affect Pioneer. The ultimate impact of the Tax Reform Legislation may differ from the Company's estimates as of December 31, 2017 due to changes in the interpretations and assumptions made by the Company as well as additional regulatory guidance that may be issued.

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As of December 31, 2017 and 2016, the Company had unrecognized tax benefits of $124 million and $112 million, respectively, resulting from research and experimental expenditures related to horizontal drilling and completion innovations. If all or a portion of the unrecognized tax benefit is sustained upon examination by the taxing authorities, the tax benefit will be recognized as a reduction to the Company's deferred tax liability and will affect the Company's effective tax rate in the period it is recognized. The Company expects to substantially resolve the uncertainties associated with the unrecognized tax benefits by December 2018.
See Note O of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's income tax rates and tax attributes.
Loss from discontinued operations, net of tax. In 2015, the Company recognized losses from discontinued operations, net of tax, of $7 million related to plugging and abandonment obligations associated with two Gulf of Mexico wells that Pioneer divested in 2009. The results of operations for these assets were recorded in discontinued operations upon their divestiture and therefore the costs incurred subsequent to their divestiture are reflected as discontinued operations in the accompanying consolidated statements of operations.
See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's discontinued operations .
Capital Commitments, Capital Resources and Liquidity
Capital commitments. The Company's primary needs for cash are for (i) capital expenditures, (ii) acquisitions of oil and gas properties, vertical integration assets and facilities, (iii) payments of contractual obligations, including debt maturities, (iv) dividends and share repurchases and (v) working capital obligations. Funding for these cash needsrequirements may be provided by any combination of internally-generated cash flow, cash and cash equivalents on hand, sales of short-term and long-term investments, proceeds from divestitures or external financing sources as discussed in "Capital resources" below. During 2018, the Company expects that it will be able to fund its needs for cash (excluding acquisitions, if any) with a combination of internally generated cash flows, cash and cash equivalents on hand, sales of short-term and long-term investments and, if necessary, availability under the Company's credit facility, or proceeds from divestituressources of nonstrategic assets.liquidity. Although the Company expects that theseits sources of funding will be adequate to fund capital expenditures, dividend payments and provide adequateits 2021 liquidity to fund other needs, including repayment of the May 2018 debt maturity and 2018 stock repurchaces,requirements, no assurancesassurance can be given that such funding sources will be adequate to meet the Company's future needs.
During 2018,Capital resources.
See the Company plans to focus its capital spending primarilyCompany's Annual Report on oil drilling activities inForm 10-K for the Spraberry/Wolfcamp areayear ended December 31, 2019 for a discussion of the Permian Basin. TheCompany's 2019 capital resources as compared to the Company's 2018 capital budget totals $2.9resources.
As of December 31, 2020, the Company had no outstanding borrowings under its Credit Facility, and was in compliance with all of its debt covenants. The Company also had unrestricted cash on hand of $1.4 billion (excluding acquisitions, asset retirement obligations, capitalized interest, geologicalas of December 31, 2020.

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Sources and geophysical administrative costsuses of cash in 2020, as compared to 2019, are as follows:
Year Ended December 31,
20202019Change
(in millions)
Net cash provided by operating activities$2,083 $3,115 $(1,032)
Net cash used in investing activities$(1,668)$(2,447)$(779)
Net cash provided by (used in) financing activities$381 $(788)$1,169 
Operating activities. The decrease in net cash flow provided by operating activities in 2020, as compared to 2019, is primarily due to (i) decreases in the Company's oil and information technology systems upgrades), consistingNGL revenues as a result of $2.6 billion for drillingdecreases in commodity prices and completion related activities, including additional tank batteries, saltwater disposal facilities(ii) a $522 million decrease in net sales of purchased oil and gas processing facilities, and $260 million for water infrastructure, vertical integration, field facilities and vehicles. Baseddue to a decrease in margins on the Company's current Management Price Outlooks, Pioneer expects its net cash flows from operating activities, cashdownstream Gulf Coast refinery and cash equivalents on hand,export oil sales, of short-term and long-term investments and, if necessary, availability underpartially offset by the Company's credit facility or proceeds from divestitures of nonstrategic assetsoverall lower cost structure due to be sufficient to fund its planned capital expenditures, dividend paymentsoperating cost reduction efforts and provide adequate liquidity to fund other needs.its 2019 and 2020 Overhead Cost Reduction Initiatives.
Investing activities. Net cash used in investing activities during 2017 was $1.8 billion, as compared to net cash used in investing activities of $3.8 billion and $1.8 billion during 2016 and 2015, respectively. The decrease in net cash flow used in investing activities during 2017,2020, as compared to 2016,2019, is primarily due to (i) a decrease of $1.8 billion in net purchases of investments (commercial paper, corporate bonds and time deposits), (ii) a $563 million increase in proceeds from investments and (iii) the purchase of 28,000 net acres in the Permian Basin, with net production of approximately 1,400 BOEPD, from an unaffiliated third party for $428 million in 2016, partially offset by (iv) a $508 million increasedecreases in additions to oil and gas properties (v) a $155 million decrease in proceeds from the dispositionand additions of assets and (v) a $133 million increase in additions to other assets and other property and equipment. Proceeds fromequipment of $1.5 billion. The reduction in 2020 investing activities reflects the Company's reduced capital budget and cost reduction efforts, partially offset by a decrease in the sale of investments and the disposition of assets during 2017 included $264of $624 million associated with the sale of approximately 20,500 acres in the Martin County region of the Permian Basin with net production of approximately1,500 BOEPD. Proceeds from the disposition of assets during 2016 included $501and $89 million, associated with the sale of EFS Midstream.respectively. The Company's investing activities during the year ended December 31, 20172020 were primarily funded by net cash provided by operating activities.
Financing activities.The increase inCompany's significant financing activities are as follows:
2020: The Company (i) received $1.1 billion from the issuance of 1.90% senior notes, net cash flow used in investing activities during 2016, as compared to 2015, is primarily due to (i) net purchases of $1.8issuance costs and discounts, (ii) received $1.3 billion of investments (commercial paper, corporate bonds and time deposits), (ii)from the purchaseissuance of the aforementioned 28,0000.25% convertible senior notes, net acres in the Permian Basin from an unaffiliated third party for $428of issuance fees, (iii) paid $113 million in 2016 and (iii) a $46 million decrease in proceeds from the disposition of assets, partially offset by (iv) a $253 million decrease in additions to oil and gas properties and (v) an $80 million decrease in additions to other assets and other property and equipment. Proceeds from the

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disposition of assets during 2016 and 2015 included $501 million and $530 million, respectively,enter into capped call transactions with certain financial institution counterparties associated with the saleconvertible senior notes issuance, (iv) paid an aggregate total of EFS Midstream.$748 million associated with the early repayment of a portion of the 3.45% senior notes, 3.95% senior notes and 7.20% senior notes, (v) repaid $450 million associated with the maturity of its 7.50% senior notes in January 2020, (vi) paid dividends of $346 million, (vii) repurchased $176 million of its common stock and (viii) paid $173 million of other liabilities.
2019: The Company repurchased $653 million of its common stock and paid dividends of $127 million.
Dividends/distributions. During the year ended December 31, 2020, the Company's investing activitiesboard of directors declared dividends of $2.20 per common share, compared to dividends declared of $1.20 per common share during the year ended December 31, 2016 were primarily funded by net cash provided by operating activities, cash on hand and the Company's issuance of 19.8 million shares of common stock during 2016 for cash proceeds of $2.5 billion.
Dividends/distributions. During each of the years ended December 31, 2017, 2016 and 2015, the Board declared semiannual2019. The Company paid aggregate dividends of $0.04 per common share. Associated therewith, the Company paid $14$346 million $13during 2020 and $127 million and $12 million, respectively, of aggregate dividends. In addition, in February 2018, the Board declared a cash dividend of $0.16 per share on Pioneer's outstanding common stock, payable April 12, 2018 to stockholders of record at the close of business on March 29, 2018.during 2019. Future dividends are at the discretion of the Board,Company's board of directors, and, if declared, the Boardboard of directors may change the dividend amount based on the Company's liquidity and capital resources at thatthe time.
Off-balance sheet arrangements.From time to time, the Company enters into arrangements and transactions that can give rise to material off-balance sheet obligations of the Company. As of December 31, 2017,2020, the material off-balance sheet arrangements and transactions that the Company had entered into included (i) operating lease agreements, (ii) drilling commitments, (iii) firm purchase, transportation, storage and fractionation commitments, (iv)(ii) open purchase commitments and (v)(iii) contractual obligations for which the ultimate settlement amounts are not fixed and determinable. The contractual obligations for which the ultimate settlement amounts are not fixed and determinable include (i) derivative contracts that are sensitive to future changes in commodity prices or interest rates, (ii) gathering, processing (primarily treating and fractionation) and transportation commitments on uncertain volumes of future throughput (iii) open purchase commitments and (iv)(iii) indemnification obligations following certain divestitures.
In connection with its divestiture transactions, the Company may retain certain liabilities and provide the purchaser certain indemnifications, subject to defined limitations, which may apply to identified pre-closing matters, including matters of litigation, environmental contingencies, royalty and income taxes. Also associated with its divestiture transactions, the Company has issued and received guarantees to facilitate the transfer of contractual obligations, such as firm transportation agreements or gathering and processing arrangements. The Company does not recognize a liability if the fair value of the obligation is immaterial and the likelihood of making payments under these guarantees is remote.
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. The Company expects to enter into similar contractual arrangements in the future, including incremental derivative contracts and additional firm purchase, transportation, storage and transportation fractionation

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arrangements, in order to support the Company's business plans. See "Contractual obligations" below and Note J11 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information regarding the Company's off-balance sheet arrangements.additional information.
Contractual obligations. The Company's contractual obligations include long-term debt, operating leases drilling commitments (primarily related to commitments to pay day rates for contracted drilling rigs)rigs, equipment and office facilities), capital funding obligations, derivative obligations, firm transportation, storage and fractionation commitments, minimum annual gathering, processing and transportation commitments and other liabilities (including postretirement benefit obligations). Other joint owners in the properties operated by the Company willcould incur portions of the costs represented by these commitments.
Firm commitments. The following table summarizes by periodCompany has short-term and long-term firm purchase, gathering, processing, transportation, fractionation and storage commitments representing take-or-pay agreements, which include contractual commitments (i) to purchase sand, water and diesel for use in the payments due byCompany's drilling operations, (ii) with midstream service companies and pipeline carriers for future gathering, processing, transportation, fractionation and storage and (iii) with oilfield services companies that provide drilling and pressure pumping services. The Company does not expect to be able to fulfill all of its short-term and long-term firm transportation volume obligations from projected production of available reserves; consequently, the Company plans to purchase third party volumes to satisfy its firm transportation commitments if it is economic to do so; otherwise, it will pay demand fees for contractual obligations estimatedany commitment shortfalls. The Company also has open purchase commitments for inventories, materials and other property and equipment ordered, but not received, as of December 31, 2017:
 Payments Due by Year
 2018 2019 and 2020 2021 and 2022 Thereafter
 (in millions)
Long-term debt (a)$450
 $450
 $1,100
 $750
Operating leases (b)27
 95
 77
 680
Drilling commitments (c)93
 78
 
 
Derivative obligations (d)232
 23
 
 
Purchase commitments (e)179
 6
 
 
Other liabilities (f)102
 82
 82
 169
Firm purchase, gathering, processing, transportation and fractionation commitments (g)568
 1,291
 1,103
 1,554
 $1,651
 $2,025
 $2,362
 $3,153
_____________________
(a)2020. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" for information regarding estimated future interest payment obligations under long-term debt obligations. The amounts included in the table above represent principal maturities only.
(b)See Note J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information about the Company's operating leases.
(c)Drilling commitments represent future minimum expenditure commitments for drilling rig services and well commitments under contracts to which the Company was a party on December 31, 2017. See Note J of Notes to Consolidated Financial

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Statements included in "Item 8. Financial Statements2. Properties" and Supplementary Data" for additional information regarding the Company's drilling commitments.
(d)Derivative obligations represent net liabilities determined in accordance with master netting arrangements for commodity derivatives that were valued as of December 31, 2017. The Company's commodity derivative contracts are periodically measured and recorded at fair value and continue to be subject to market and credit risk. The ultimate liquidation value of the Company's commodity derivatives will be dependent upon actual future commodity prices, which may differ materially from the inputs used to determine the derivatives' fair values as of December 31, 2017. See "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" and Note E of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's derivative obligations.
(e)Open purchase commitments primarily represent expenditure commitments for inventory, materials and other property and equipment ordered, but not received, as of December 31, 2017.
(f)The Company's other liabilities represent current and noncurrent other liabilities that are comprised of postretirement benefit obligations, litigation and environmental contingencies, asset retirement obligations and other obligations for which neither the ultimate settlement amounts nor their timings can be precisely determined in advance. See Notes H, I and J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's postretirement benefit obligations, asset retirement obligations and litigation and environmental contingencies, respectively.
(g)Firm purchase, gathering, processing, transportation and fractionation commitments represent take-or-pay agreements, which include (i) contractual commitments to purchase sand and water for use in the Company's drilling operations and (ii) estimated fees on production throughput commitments and demand fees associated with volume delivery commitments. The Company does not expect to be able to fulfill all of its short-term and long-term volume delivery obligations from projected production of available reserves; consequently, the Company plans to purchase third party volumes to satisfy its commitments if it is economic to do so; otherwise, it will pay demand fees for any commitment shortfalls. See "Item 2. Properties" and Note J of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's firm purchase, gathering, processing, transportation and fractionation commitments.
Capital resources. The Company's primary capital resources are cash and cash equivalents, net cash provided by operating activities, sales of short-term and long-term investments, proceeds from divestitures and proceeds from financing activities (principally borrowings under the Company's credit facility or issuances of debt or equity securities). If internal cash flows do not meet the Company's expectations, the Company may reduce its level of capital expenditures, and/or fund a portion of its capital expenditures (i) by using cash on hand, (ii) through sales of short-term and long-term investments, (iii) with borrowings under the Company's credit facility, (iv) through issuances of debt or equity securities or (v) through other sources, such as sales of nonstrategic assets.
Operating activities. Net cash provided by operating activities for the years ended December 31, 2017, 2016 and 2015 was $2.1 billion, $1.5 billion and $1.3 billion, respectively. The increase in net cash flow provided by operating activities in 2017, as compared to 2016, was primarily due to increases in the Company's oil and gas revenues in 2017 as a result of increases in commodity prices and sales volumes, partially offset by a $613 million reduction in cash provided by commodity derivatives during 2017. The increase in net cash flow provided by operating activities in 2016, as compared to 2015, was primarily due to increases in the Company's oil and gas revenues in 2016 as a result of increased sales volumes (partially offset by decreases in oil and gas prices), reductions in operating costs and a decrease in funds used to satisfy working capital obligations.
Asset divestitures. In February 2018, the Company announced its intention to divest its properties in South Texas, Raton and the West Panhandle field and focus its efforts and capital resources to its Permian Basin assets. No assurance can be given that the sales will be completed in accordance with the Company's plans or on terms and at prices acceptable to the Company.
In April 2017, the Company completed the sale of approximately 20,500 acres in the Martin County region of the Permian Basin to an unaffiliated third party for cash proceeds of $264 million. The sale resulted in a gain of $194 million. In conjunction with the divestiture, the Company reduced the carrying value of goodwill by $2 million, reflecting the portion of the Company's goodwill related to the assets sold.
In July 2015, the Company completed the sale of its 50.1 percent interest in EFS Midstream to an unaffiliated third party, with the Company receiving total consideration of $1.0 billion, of which $530 million was received at closing and the remaining $501 million was received in July 2016.
See Note C of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for more information regarding the Company's asset divestitures.

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Financing activities. Net cash used in financing activities during 2017 was $529 million, as compared to net cash provided by financing activities during 2016 and 2015 of $2.0 billion and $951 million, respectively. The following provides a description of the Company's significant financing activities during 2017, 2016 and 2015:
During March 2017, the Company repaid $485 million associated with the maturity of the Company's 6.65% senior notes;
During July 2016, the Company repaid $455 million associated with the maturity of the Company's 5.875% senior notes;
During June 2016, the Company completed the sale of 6.0 million shares of its common stock at a per-share price, after underwriter discounts and offering expenses, of $155.27, resulting in $937 million of net cash proceeds;
During January 2016, the Company completed the sale of 13.8 million shares of its common stock at a per-share price, after underwriter discounts and offering expenses, of $115.78, resulting in $1.6 billion of net cash proceeds;
During December 2015, the Company issued $500 million of 3.45% Senior Notes due 2021 and $500 million of 4.45% Senior Notes due 2026 and received combined proceeds, net of $9 million of underwriter discounts and offering expenses, of $991 million; and
During August 2015, the Company amended its credit facility with a syndicate of financial institutions to extend its maturity to August 2020, while maintaining aggregate loan commitments of $1.5 billion.
See Note G of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regardinginformation.
Long-term debt. As of December 31, 2020, the significantCompany's outstanding debt financing activities.is comprised of senior notes and convertible senior notes. The senior notes and convertible senior notes are unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company. See Note 7 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
As the Company pursues its strategy, it may utilize various financing sources, including fixedLeases. The Company's short-term and floating rate debt, convertible securities, preferred stock or common stock. long-term operating lease obligations primarily relate to contracted drilling rigs, equipment and office facilities. See Note 10 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
Derivative obligations. The Company cannot predict the timing or ultimate outcomeCompany's short-term and long-term derivative obligations represent net liabilities determined in accordance with master netting arrangements for commodity derivatives that were valued as of any such actions as theyDecember 31, 2020. The Company's commodity derivative contracts are periodically measured and recorded at fair value and continue to be subject to market conditions, among other factors.and credit risk. The Companyultimate liquidation value of the Company's commodity derivatives will be dependent upon actual future commodity prices, which may also issue securitiesdiffer materially from the inputs used to determine the derivatives' fair values as of December 31, 2020. See Note 4 and Note 5 of Notes to Consolidated Financial Statements included in exchange"Item 8. Financial Statements and Supplementary Data" and "Item 7A. Quantitative and Qualitative Disclosures About Market Risk" 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.additional information.
Liquidity.Other liabilities. The Company's principal sourcesother liabilities represent current and noncurrent other liabilities that are comprised of short-term liquidity arelitigation and environmental contingencies, asset retirement obligations and other obligations for which neither the ultimate settlement amounts nor their timings can be precisely determined in advance. See Note 9 and Note 11 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
Book capitalization and current ratio. The Company's net book capitalization at December 31, 2020 was $13.4 billion, consisting of cash and cash equivalents net cash provided by operating activities, sales of short-term$1.4 billion, debt of $3.3 billion and long-term investments, proceeds from divestitures and unused borrowing capacity under its credit facility. Asequity of December 31, 2017, the Company had no outstanding borrowings under its Credit Facility, leaving $1.5 billion of unused borrowing capacity. The Company was in compliance with all of its debt covenants.$11.6 billion. The Company's credit facility contains certain financial covenants, which include the maintenance of a ratio of totalnet debt to book capitalization subjectincreased to certain adjustments, not to exceed .60:1, which is above the Company's14 percent at December 31, 20172020 from 12 percent at December 31, 2019. The Company's ratio of .16:1. The Company also had cash on hand of $896 million, short-term investments of $1.2 billion and long-term investments of $66 million as ofcurrent assets to current liabilities was 1.36:1 at December 31, 2017. If internal cash flows do not meet the Company's expectations, the Company may fund a portion of its capital expenditures using cash on hand, through sales of short-term and long-term investments, availability under its credit facility, issuances of debt or equity securities or other sources, such2020, as sales of nonstrategic assets, and/or reduce its level of capital expenditures or reduce dividend payments. The Company cannot provide any assurance that needed short-term or long-term liquidity will be available on acceptable terms orcompared to 0.88:1 at all. Although the Company expects that the combination of internal operating cash flows, cash and cash equivalents on hand, sales of short-term and long-term investments and, if necessary, available capacity under the Company's credit facility will be adequate to fund 2018 capital expenditures, dividend payments and provide adequate liquidity to fund other needs, including repayment of the May 2018 debt maturity and 2018 stock repurchases, no assurances can be given that such funding sources will be adequate to meet the Company's future needs.December 31, 2019.
Debt ratings. The Company is rated as mid-investmentinvestment grade by three credit rating agencies. The Company receives debtCompany's credit ratings from several of the major ratings agencies, which are subject to regular reviews.reviews by the credit rating agencies. The Company believes that each of the rating agencies considers many factors in determining the Company's ratings, including: (i) production growth opportunities, (ii) liquidity, (iii) debt levels, (iv) asset composition and (v) proved reserve mix. A reduction in the Company's debt ratings could increase the interest rates that the Company incurs on Credit Facility borrowings and could negatively impact the Company's ability to obtain additional financing or the interest rate, fees and other terms associated with such additional financing.
Book capitalizationFinancing activities in connection with the Parsley Acquisition.
On the closing date of the Parsley Acquisition, Parsley merged into a newly formed wholly-owned subsidiary of the Company, and current ratio.the subsidiaries of Parsley, including Jagged Peak Energy LLC ("Jagged Peak"), became indirect subsidiaries of the Company. In January 2021, the Company issued $750 million of 0.750% Senior Notes that will mature January 15, 2024,

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$750 million of 1.125% Senior Notes that will mature January 15, 2026 and $1 billion of 2.150% Senior Notes that will mature January 15, 2031 (the "January 2021 Senior Notes Offering"). The Company'sCompany received proceeds, net book capitalization at December 31, 2017 was $11.8 billion, consisting of cash$18 million of issuance costs and cash equivalentsdiscounts, of $896 million, short-term and long-term investments of $1.3 billion, debt of $2.7 billion and equity of $11.3$2.5 billion. The Company's net debt to book capitalization increased to five percent at December 31, 2017 from two percent at December 31, 2016, primarily due to funding the Company's oil and gas drilling andsenior notes are unsecured obligations ranking equally in right of payment with all other property investments with cash and cash equivalents and sales of short-term and long-term investments. The Company's ratio of current assets to current liabilities decreased to 1.41:1 at December 31, 2017, as compared to 2.11:1 at December 31, 2016, primarily due to an increase in accounts payable as a resultsenior unsecured indebtedness of the Company's higher drillingCompany.
The Company used the proceeds from the January 2021 Senior Notes Offering to (i) pay $1.6 billion to redeem Parsley's 5.250% Senior Notes due 2025, Parsley's 5.375% Senior Notes due 2025 and Jagged Peak's 5.875% Senior Notes due 2026, and (ii) pay $852 million to purchase a portion of the outstanding Parsley 5.625% Senior Notes due 2027 and 4.125% Senior Notes due 2028 pursuant to a cash tender offer. In connection with the tender offers, the Company also obtained the requisite consents from holders of Parsley's 5.625% Senior Notes due 2027 and 4.125% Senior Notes due 2028 to amend the indentures pursuant to which the notes were issued to, among other things, (i) eliminate substantially all of the restrictive covenants and related provisions and certain events of default contained in each indenture and (ii) shorten the minimum notice requirement for optional redemptions to three days. Following the completion related activitiesof the tender offers, an aggregate principal amount of $179 million of Parsley's 5.625% Senior Notes due 2027 and $138 million of Parsley's 4.125% Senior Notes due 2028 remained outstanding. See Note 19 of Notes to Consolidated Financial Statements included in the fourth quarter of 2017."Item 8. Financial Statements and Supplementary Data" for additional information.
Critical Accounting Estimates
The Company prepares its consolidated financial statements for inclusion in this Report in accordance with GAAP. See Note B2 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a comprehensive discussion of the Company's significant accounting policies. GAAP represents a comprehensive set of accounting and disclosure rules and requirements, the application of which requires management judgments and estimates including, in certain circumstances, choices between acceptable GAAP alternatives.additional information. The following is a discussion of the Company's most critical accounting estimates, judgments and uncertainties that are inherent in the Company's application of GAAP.
Asset retirement obligations. The Company has significant obligations to remove tangible equipment and facilities and to restore the land at the end of oil and gas production operations. The Company's removal and restoration obligations are primarily associated with plugging and abandoning wells. Estimating the future restoration and removal costs is difficult and requires

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management to make estimates and judgments because most of the removal obligations are many years in the future and contracts and regulations often have vague descriptions of what constitutes removal. Asset removal technologies and costs are constantly changing, as are regulatory, political, environmental, safety and public relations considerations.
Inherent in the present value calculation are numerous assumptions and judgments including the ultimate settlement amounts, credit-adjusted discount rates, timing of settlement and changes in the legal, regulatory, environmental and political environments. To the extent future revisions to these assumptions impact the present value of the existing asset retirement obligations, a corresponding adjustment is generally made to the oil and gas property balance. See Notes B and I of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's asset retirement obligations.
Successful efforts method of accounting. The Company utilizes the successful efforts method of accounting for oil and gas producing activities as opposed to the alternate acceptable full cost method. In general, the Company believes that net assets and net income are more conservatively measured under the successful efforts method of accounting for oil and gas producing activities than under the full cost method, particularly during periods of active exploration. The critical difference between the successful efforts method of accounting and the full cost method is as follows:that under the successful efforts method, exploratory dry holes and geological and geophysical exploration costs are charged against earnings during the periods in which they occur; whereas, under the full cost method of accounting, such costs and expenses are capitalized as assets, pooled with the costs of successful wells and charged against the earnings of future periods as a component of depletion expense. During 2017, 2016 and 2015, the Company recognized exploration, abandonment, geological and geophysical expense of $106 million, $119 million and $99 million, respectively.
Proved reserve estimates. Estimates of the Company's proved reserves included in this Report are prepared in accordance with GAAP and SEC guidelines. The accuracy of a proved reserve estimate is a function of:
the quality and quantity of available data;
the interpretation of that data;
the accuracy of various mandated economic assumptions; and
the judgment of the persons preparing the estimate.
The Company's proved reserve information included in this Report as of December 31, 2017, 20162020, 2019 and 20152018 was prepared by the Company's engineers and audited by independent petroleum engineers with respect to the Company's major properties. Estimates prepared by third parties may be higher or lower than those included herein.
Because these estimates depend on many assumptions, all of which may substantially differ from future actual results, proved reserve estimates will be different from the quantities of oil and gas that are ultimately recovered. In addition, results of drilling, testing and production after the date of an estimate may justify, positively or negatively, material revisions to the estimate of proved reserves.
It should not be assumed that the Standardized Measure included in this Report as of December 31, 20172020 is the current market value of the Company's estimated proved reserves. In accordance with SEC requirements, the Company based the 20172020 Standardized Measure on a twelve month average of commodity prices on the first day of theeach month in 2020 and prevailing costs on the date of the estimate. Actual future prices and costs may be materially higher or lower than the prices and costs utilized in the estimate. See "Item 1A. Risk Factors," "Item 2. Properties" and Unaudited Supplementary Information included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding estimates of proved reserves.information.
The Company's estimates of proved reserves materially impact depletion expense. If the estimates of proved reserves decline, the rate at which the Company records depletion expense will increase, reducing future net income. Such a decline may result from lower commodity prices, which may make it uneconomical to drill for and produce higher cost fields. In addition, a

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decline in proved reserve estimates may impact the outcome of the Company's assessment of its proved properties and goodwill for impairment.
Impairment of proved oil and gas properties. The Company reviews its proved properties to be held and used whenever management determines that events or circumstances indicate that the recorded carrying value of the properties may not be recoverable. Management assesses whether or not an impairment provision is necessary based upon estimated future recoverable proved and risk-adjusted probable and possible reserves, Management's Price Outlooks,commodity price outlooks, production and capital costs expected to be incurred to recover the reserves, discount rates commensurate with the nature of the properties and net cash flows that may be generated by the properties. Proved oil and gas properties are reviewed for impairment at the level at which depletion of proved properties is calculated. See Notes B and DNote 4 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's impairment assessments.additional information.

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Impairment of unproved oil and gas properties. At December 31, 2017, the Company carried unproved property costs of $558 million. Management assesses unproved oil and gas properties for impairment on a project-by-project basis. Management's impairmentSuch assessments include evaluatingare affected by the results of exploration activities, Management's Price Outlooks andcommodity price outlooks, planned future property sales or the expiration of all or a portion of such projects.
Suspended wells. The Company suspends the costs of exploratoryexploratory/extension wells that discover hydrocarbons pending a final determination of the commercial potential of the discovery. The ultimate disposition of these well costs is dependent on the results of future drilling activity and development decisions. If the Company decides not to pursue additional appraisal activities or development of these fields, the costs of these wells will be charged to exploration and abandonment expense.
The Company does not carry the costs of drilling an exploratoryexploratory/extension well as an asset in its consolidated balance sheets following the completion of drilling unless both of the following conditions are met:
(i)The well has found a sufficient quantity of reserves to justify its completion as a producing well; and
(ii)The Company is making sufficient progress assessing the reserves and the economic and operating viability of the project.
The well has found a sufficient quantity of reserves to justify its completion as a producing well; and
The Company is making sufficient progress assessing the reserves and the economic and operating viability of the project.
Due to the capital intensive nature and the geographical location of certain projects, it may take an extended period of time to evaluate the future potential of an exploration project and the economics associated with making a determination on its commercial viability. In these instances, the project's feasibility is not contingent upon price improvements or advances in technology, but rather the Company's ongoing efforts and expenditures related to accurately predicting the hydrocarbon recoverability based on well information, gaining access to other companies' production, transportation or processing facilities and/or getting partner approval to drill additional appraisal wells. These activities are ongoing and being pursued constantly. Consequently, the Company's assessment of suspended exploratoryexploratory/extension well costs is continuous until a decision can be made that the well has found sufficient quantities of proved reserves to sanction the project or is determined to be noncommercial and is impaired. See Note F6 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regardinginformation.
Asset retirement obligations. The Company has significant obligations to remove tangible equipment and facilities and to restore the land at the end of oil and gas production operations. The Company's suspended exploratory well costs.removal and restoration obligations are primarily associated with plugging and abandoning wells. Estimating the future restoration and removal costs is difficult and requires management to make estimates and judgments because most of the removal obligations are many years in the future and contracts and regulations often have vague descriptions of what constitutes removal. Asset removal technologies and costs are constantly changing, as are regulatory, political, environmental, safety and public relations considerations.
Inherent in the present value calculation are numerous assumptions and judgments including the ultimate settlement amounts, credit-adjusted discount rates, timing of settlement and changes in the legal, regulatory, environmental and political environments. To the extent future revisions to these assumptions impact the present value of the existing asset retirement obligations, a corresponding adjustment is generally made to the oil and gas property or other property and equipment balance. See Note 9 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information.
Deferred tax asset valuation allowances. The Company continually assesses both positive and negative evidence to determine whether it is more likely than not that its deferred tax assets will be realized prior to their expiration. Pioneer monitors Company-specific, oil and gas industry and worldwide economic factors and based on that information, along with other data, reassesses the likelihood that the Company's net operating loss carryforwards and other deferred tax attributes in each jurisdiction will be utilized prior to their expiration. There can be no assurance that facts and circumstances will not materially change and require the Company to establish deferred tax asset valuation allowances in certain jurisdictions in a future period.

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Uncertain tax positions. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based upon the technical merits of the position. As of December 31, 2017 and 2016, the Company had unrecognized tax benefits of $124 million and $112 million, respectively, resulting from research and experimental expenditures related to horizontal drilling and completion innovations. If all or a portion of the unrecognized tax benefitbenefits is sustained upon examination by the taxing authorities, the tax benefit will be recognizedrecorded as a reduction to the Company's deferred tax liability and will affect the Company's effective tax rate in the period it is recognized.recorded. As of December 2020, the Company did not have any unrecognized tax benefits. See Note O17 of Notes to the Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding uncertain tax positions.information.
Goodwill impairment.The Company reviews its goodwill for impairment at least annually. During the third quartersquarter of 2017 and 2016,2020, the Company performed a qualitative assessment of goodwill to assess whether it was more likely than not that the fair value of the Company's reporting unit was less than its carrying amount as a basis for determining whether it was necessary to perform the two-step goodwillrecord a noncash impairment test.charge. The Company determined that it was more likely than not that the Company's goodwill was not impaired. There is considerable judgment involved in estimating fair values, particularly in determining the valuation methodologies to utilize, the estimation of proved reserves as described abovemethods and the weighting of differentto use for each method if multiple valuation methodologiesmethods are applied. See Note B of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding goodwill and assessments of goodwill for impairment.
Litigation and environmental contingencies. The Company makes judgments and estimates in recording liabilities for ongoing litigation and environmental remediation. Actual costs can vary from such estimates for a variety of reasons. The costs to settle litigation can vary from estimates based on differing interpretations of laws and opinions and assessments on the amount of damages. Similarly, environmental remediation liabilities are subject to change because of changes in laws and regulations, developing information relating to the extent and nature of site contamination and improvements in technology. A liability is recorded for these types of contingencies if the Company determines the loss to be both probable and reasonably estimable. See Note J11 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding the Company's commitments and contingencies.information.

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Valuation of stock-based compensation. The Company calculates the fair value of stock-based compensation using various valuation methods. The valuation methods require the use of estimates to derive the inputs necessary to determine fair value. The Company utilizes (i) the Black-Scholes option pricing model to measure the fair value of stock options, (ii) the closing stock price on the day prior to the date of grant for the fair value of restricted stock awards, (iii) the closing stock price on the balance sheet date for restricted stock awards that are expected to be settled wholly or partially in cash on their vesting date and (iv) the Monte Carlo simulation method for the fair value of performance unit awards. See Note H8 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the Company's stock-based compensation.additional information.
Valuation of other assets and liabilities at fair value. The Company periodically measures and records certain assets and liabilities at fair value. The assets and liabilities that the Company measures and records at fair value on a recurring basis include trading securities,equity investments, deferred compensation plan assets, commodity derivative contracts and interest rate contracts. Other assets are not measured at fair value on an ongoing basis, but are subject to fair value adjustments in certain circumstances. The assets and liabilities that the Company measures and records at fair value on a nonrecurring basis include inventory,inventories, proved and unproved oil and gas properties, assets acquired and liabilities assumed in business combinations and other long-lived assets that are written down to fair value when they are determined to be impaired or held for sale. The Company also measures and discloses certain financial assets and liabilities at fair value, such as long-term debt and investments. The valuation methods used by the Company to measure the fair values of these assets and liabilities may require considerable management judgment and estimates to derive the inputs necessary to determine fair value estimates, such as future prices, credit-adjusted risk-free rates and current volatility factors. See Note D4 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for information regarding the methods used by management to estimate the fair values of these assets and liabilities.additional information.
New Accounting Pronouncements
The effects of new accounting pronouncements are discussed in Note B2 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data."

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ITEM 7A.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
ITEM 7A.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK
In the normal course of business, the Company's financial position is routinely subject to a variety of risks, including market risks associated with changes in commodity prices, interest rate movements on outstanding debt and credit risks. These risks are mitigated through the Company's risk management program, which includes the use of derivative financial instruments and sales of purchased oil and gas. The following quantitative and qualitative information is provided about financial instruments to which the Company was a party as of December 31, 2017,2020, and from which the Company may incur future gains or losses from changes in commodity prices or interest rates. The Company does not enter into any financial instruments, including derivatives, for speculative or trading purposes.
The fair values of the Company's long-term debt and derivative contracts are determined based on observable inputs and utilizing the Company's valuation models and applications. Interest rate risk. As of December 31, 2017,2020, the Company was a partyhad no variable rate debt outstanding under the Credit Facility and therefore no related exposure to swap contracts, collar contractsinterest rate risk. As of December 31, 2020, the Company had $3.3 billion of fixed rate long-term debt outstanding with an weighted average cash interest rate of 2.2 percent. Although changes in interest rates may affect the fair value of the Company's fixed rate long-term debt, any changes would not expose the Company to the risk of earnings or cash flow losses. The Company has no interest rate derivative instruments outstanding; however, it may enter into derivative instruments in the future to mitigate interest rate risk if the Company becomes subject to exposure to interest rate risk. See Note 4 and collar contracts with short put options. See Notes D and ENote 7 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for additional information regarding theinformation.
Commodity price risk. The Company's fair value measurements and derivative contracts. The following table reconciles the changes that occurred in the fair values of the Company's open derivative contracts during 2017:
 Derivative Contract Net Liabilities
 Commodities Interest Rate Total
 (in millions)
Fair value of contracts outstanding as of December 31, 2016$(76) $6
 $(70)
Changes in contract fair values(99) (1) (100)
Contract maturities(67) 
 (67)
Contract termination receipts(2) (5) (7)
Fair value of contracts outstanding as of December 31, 2017$(244) $
 $(244)
Quantitative Disclosures
Interest rate sensitivity. See Note G of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" and Capital Commitments, Capital Resources and Liquidity included in "Item 7. Management's Discussion and Analysis of Financial Condition and Results of Operations" for information regarding the Company's outstanding debt and debt transactions.
The following table provides information about financial instruments to which the Company was a party as of December 31, 2017 and that are sensitive to changes in interest rates. The table presents debt maturities by expected maturity dates, the weighted average interest rates expected to be paid on the debt given current contractual terms andprimary market conditions, and the aggregate estimated fair value of the Company's outstanding debt. For fixed rate debt, the weighted average interest rates represent the contractual fixed rates that the Company was obligated to periodically pay on the debt as of December 31, 2017. Although the Company had no outstanding variable rate debt as of December 31, 2017, the average variable contractual rates for its credit facility (that matures in August 2020) projected forward proportionaterisk exposure is tied to the forward yield curve for LIBOR on February 14, 2018 is presented inprice it receives from the table below.
INTEREST RATE SENSITIVITY
DEBT OBLIGATIONS AS OF DECEMBER 31, 2017
 Year Ending December 31,     
Asset (Liability)
Fair Value at
December 31,
 2018 2019 2020 2021 2022 Thereafter Total 2017
 (dollars in millions)
Total Debt:               
Fixed rate principal maturities (a)$450
 $
 $450
 $500
 $600
 $750
 $2,750
 $(2,936)
Weighted average fixed interest rate5.11% 5.00% 4.42% 4.72% 4.94% 5.70%    
Average variable interest rate3.50% 3.94% 4.13% 

 

      
_______________________
(a)Represents maturities of principal amounts excluding debt issuance costs and debt issuance discounts.
Interest rate swaps. During 2017, the Company was party to interest rate derivative contracts whereby the Company would have received the three-month LIBOR rate for the 10-year period from December 2017 through December 2027 in exchange for paying a fixed interest ratesale of 1.81 percent on a notional amount of $100 million on December 15, 2017. During the fourth quarter

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of 2017, the Company liquidated its interest rate derivative contracts for cash proceeds of $5 million. As of December 31, 2017, the Company did not have any interest rate derivatives outstanding.
Commodity derivative instruments and price sensitivity. The following table provides information about the Company's oil, NGL and gas production. Realized pricing is volatile and is determined by market prices that fluctuate with changes in supply and demand for these products throughout the world. The price the Company receives for its production depends on many factors outside of the control of the Company, including differences in commodity pricing at the point of sale versus various index prices. Reducing the Company's exposure to price volatility helps secure funds to be used in its capital program and to pay contractual obligations and dividends. The Company mitigates its commodity price risk through the use of derivative financial instruments, that were sensitive to changes insales of purchased oil NGL and gas prices asand marketing derivatives.
Derivative financial instruments. The Company's decision on the quantity and price at which it executes derivative contracts is based in part on its view of December 31, 2017. Although mitigated bycurrent and future market conditions. The Company may choose not to enter into derivative positions for expected production if the Company'sprice environment for certain time periods is deemed to be unfavorable. Additionally, the Company may choose to liquidate existing derivative activities, declinespositions prior to the expiration of their contractual maturity in oil, NGLorder to monetize gain positions for the purpose of funding its capital program, contractual obligations, dividends and gas prices would reduceshare repurchases. While derivative positions limit the Company's revenues.
downside risk of adverse price movements, it also limits future revenues from upward price movements. The Company manages commodity price risk with the following types of derivative contracts, such as swap contracts, collar contracts and collar contracts with short put options. Swap contracts providecontracts:
Swaps. The Company receives a fixed price forand pays a floating market price to the counterparty on a notional amount of sales volumes. volumes, thereby fixing the price for the commodity sold.
Collars. Collar contracts provide minimum ("floor" or "long put") and maximum ("ceiling") prices on a notional amount of sales volumes, thereby allowing some price participation if the relevant index price closes above the floor price but below the ceiling price.
Collar contracts with short put options. Collar contracts with short put options differ from other collar contracts by virtue of the short put option price, below which the Company's realized price will exceed the variable market prices by the long put-to-short put price differential.
Basis swaps. Basis swap contracts fix the basis differentials between the index price at which the Company sells its production and the index price used in swap or collar contracts.
Options. Selling individual call options can enhance the market price by the premium received or the premium received can be utilized to improve swap or collar contract prices. Purchased put options establish a minimum floor price (less any premiums paid) and allows participation in higher prices when prices close above the floor price.
The Company has entered into derivative contracts for a portion of its forecasted 2021 and 2022 production; consequently, if commodity prices decline, the Company could realize lower prices for volumes not protected by the Company's derivative activities and could see a reduction in derivative contract prices available for the volumes not protected in the future. As a result, the Company's internal cash flows will be negatively impacted by a reduction in commodity prices.

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The average forward prices based on December 31, 2020 market quotes are as follows:
2021Year Ending
First
Quarter
Second QuarterThird QuarterFourth QuarterDecember 31, 2022
Average forward Brent oil price$51.80 $51.50 $51.05 $50.62 $50.03 
Average forward WTI Midland oil price$49.60 $49.29 $48.70 $48.15 $47.15 
Average forward NYMEX gas price$2.53 $2.57 $2.70 $2.82 $2.58 
Average forward DUTCH TTF gas price$6.75 $5.90 $5.80 $6.28 $5.82 
Permian Basin index swap contracts:
Average forward basis differential price (a)$(0.20)$— $— $— $— 
Average forward basis differential price (b)$(2.20)$(2.21)$(2.35)$(2.47)$(2.88)
The average forward prices based on February 23, 2021 market quotes are as follows:
2021Year Ending
First
Quarter
Second QuarterThird QuarterFourth QuarterDecember 31, 2022
Average forward Brent oil price$64.93 $63.22 $61.68 $60.46 $58.29 
Average forward WTI Midland oil price$62.60 $61.22 $59.33 $57.85 $55.27 
Average forward NYMEX gas price$2.88 $2.89 $2.99 $3.08 $2.71 
Average forward DUTCH TTF gas price$5.80 $5.73 $5.75 $6.26 $5.99 
Permian Basin index swap contracts:
Average forward basis differential price (a)$0.10 $— $— $— $— 
Average forward basis differential price (b)$(2.33)$(2.00)$(2.35)$(2.61)$(3.02)
___________________
(a)Based on market quotes for basis differentials between Permian Basin gas index prices and the NYMEX Henry Hub index price.
(b)Based on market quotes for basis differentials between Midland oil index prices and the Brent oil index price.
See Notes B, DNote 4 and ENote 5 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a description of the accounting procedures followed by the Company for itsCompany's open derivative financial instrumentspositions and for specific information regarding the termsadditional information.
Sales of the Company's derivative financial instruments that are sensitive to changes in oil, NGL or gas prices.

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DERIVATIVE FINANCIAL INSTRUMENTS AS OF DECEMBER 31, 2017
 2018   Asset (Liability) Fair Value at December 31, 2017 (a)
 First Quarter Second Quarter Third Quarter Fourth Quarter Year Ending December 31, 2019 
           (in millions)
Oil Derivatives:           
Average daily notional Bbl volumes:           
Collar contracts3,000
 3,000
 3,000
 3,000
 
 $(4)
Weighted average ceiling price per Bbl$58.05
 $58.05
 $58.05
 $58.05
 $
  
Weighted average floor price per Bbl$45.00
 $45.00
 $45.00
 $45.00
 $
  
Collar contracts with short puts (b)149,000
 149,000
 154,000
 159,000
 40,000
 $(234)
Weighted average ceiling price per Bbl$57.79
 $57.79
 $57.70
 $57.62
 $59.62
  
Weighted average floor price per Bbl$47.42
 $47.42
 $47.34
 $47.26
 $52.00
  
Weighted average short put price per Bbl$37.38
 $37.38
 $37.31
 $37.23
 $42.00
  
Average forward NYMEX oil prices (c)$60.60
 $60.23
 $59.00
 $57.65
 $55.13
  
NGL Derivatives:           
Ethane basis swap contracts (MMBtu) (d)6,920
 6,920
 6,920
 6,920
 6,920
 $
Weighted average price differential per MMBtu$1.60
 $1.60
 $1.60
 $1.60
 $1.60
  
Average forward NYMEX gas prices (c)$2.59
 $2.66
 $2.74
 $2.83
 $2.77
  
Gas Derivatives:           
Average daily notional MMBtu volumes:           
Swap contracts (e)30,000
 100,000
 100,000
 100,000
 
 $6
Weighted average fixed price per MMBtu$3.37
 $3.00
 $3.00
 $3.00
 $
  
Collar contracts with short puts100,000
 50,000
 50,000
 50,000
 
 $4
Weighted average ceiling price per MMBtu$3.82
 $3.40
 $3.40
 $3.40
 $
  
Weighted average floor price per MMBtu$3.15
 $2.75
 $2.75
 $2.75
 $
  
Weighted average short put price per MMBtu$2.57
 $2.25
 $2.25
 $2.25
 $
  
Average forward NYMEX gas prices (c)$2.59
 $2.66
 $2.74
 $2.83
    
Basis swap contracts           
Southern California index swap contracts (f)(g)80,000
 40,000
 80,000
 53,261
 80,000
 $(12)
Weighted average fixed price per MMBtu$0.34
 $0.30
 $0.30
 $0.43
 $0.31
  
Average forward basis differential prices (h)$0.40
 $0.39
 $0.58
 $0.70
 $0.61
  
Houston Ship Channel index swap volume (f)(i)3,444
 
 
 
 
 $
Weighted average fixed price per MMBtu$0.63
 $
 $
 $
 $
  
Average forward basis differential prices (h)$0.64
 $
 $
 $
    
_____________________
(a)In accordance with Financial Accounting Standards Board Accounting Standards Codification ("ASC") 210-20 and ASC 815-10, the Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net derivative assets or net derivative liabilities, as the case may be.purchased commodities. The net asset and liability amounts shown above have been provided on a commodity contract-type basis, which may differ from their master netting arrangements classifications.
(b)Subsequent to December 31, 2017, the Company entered into additional oil collar contracts with short puts for 25,000 Bbls per day of 2019 production with a ceiling price of $62.55 per Bbl, a floor price of $53.80 per Bbl and a short put price of $43.80 per Bbl.
(c)The average forward NYMEX oil, ethane and gas prices are based on February 14, 2018 market quotes.
(d)The ethane basis swap contracts reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices. The ethane basis swap contracts fix the basis differential on a NYMEX Henry Hub ("HH") MMBtu equivalent basis. The Company will receive the HH price plus the price differential on 6,920 MMBtu per day, which is equivalent to 2,500 Bbls per day of ethane.

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(e)Subsequent to December 31, 2017, the Company entered into additional swap contracts for 100,000 MMBtu per day of February 2018 production with a price of $3.46 per MMBtu.
(f)The referenced basis swap contracts fix the basis differentials between Permian Basin index prices and southern California or Houston Ship Channel index prices for Permian Basin gas forecasted for sale in southern California or the Gulf Coast region.
(g)Subsequent to December 31, 2017, the Company entered into additional basis swap contracts for 20,000 MMBtu per day of November 2018 through March 2019 production with a price differential of $0.77 per MMBtu.
(h)The average forward basis differential prices are based on February 14, 2018 market quotes for basis differentials between Permian Basin index prices and southern California and Houston Ship Channel index prices.
(i)Subsequent to December 31, 2017, the Company entered into additional basis swap contracts for 10,000 MMBtu per day of February 2018 production with a price differential of $0.82 per MMBtu.
Marketing derivatives. Periodically, the Company enters into buypurchase transactions with third parties and sell marketing arrangements to fulfill firm pipeline transportation commitments. Associated with these marketing arrangements, the Company may enter into index swap contracts to mitigate price risk. The following table provides information about the Company's marketing derivative financial instruments that were sensitive to changes in oil prices as of December 31, 2017:
  2018 Liability Fair Value at December 31, 2017 (a)
  First Quarter Second Quarter Third Quarter Fourth Quarter 
          (in millions)
Oil Derivatives:          
Average daily notional Bbl volumes:          
  Basis swap contracts          
Louisiana Light Sweet index swap volume (b) 10,000
 10,000
 6,739
 
 $(3)
Price differential ($/Bbl) $3.18
 $3.18
 $3.18
 $
  
Average forward basis differential prices (c) $2.51
 $2.15
 $2.25
    
Magellan East Houston index swap volume (b) 11,556
 11,703
 3,370
 
 $(1)
Price differential ($/Bbl) $3.29
 $3.30
 $3.30
 $
  
Average forward basis differential prices (c) $3.50
 $3.25
 $3.70
    
____________________
(a)In accordance with Financial Accounting Standards Board Accounting Standards Codification ("ASC") 210-20 and ASC 815-10, the Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net derivative assets or net derivative liabilities, as the case may be. The net asset and liability amounts shown above have been provided on a commodity contract-type basis, which may differ from their master netting arrangements classifications.
(b)The referenced basis swap contracts fix the basis differentials between NYMEX WTI and Louisiana Light Sweet ("LLS") or Magellan East Houston ("MEH") oil prices for Permian Basin oil forecasted for sale in the Gulf Coast region.
(c)The average forward basis differential prices are based on February 14, 2018 market quotes for basis differentials between NYMEX WTI and LLS or MEH oil prices.
Diesel derivatives. Periodically, the Company enters into diesel derivative swap contracts that mitigate fuel price risk. The diesel derivative swap contracts are priced at an index that is highly correlated to the prices that the Company incurs to fuel its drilling rigs and fracture stimulation fleet equipment. During 2017, the Company liquidated its diesel derivative swap contracts for cash proceeds of $2 million. As of December 31, 2017, the Company did not have any diesel derivative contracts outstanding.
Qualitative Disclosures
The Company's primary market risk exposures are to changes in commodity prices and interest rates. These risks did not change materially from December 31, 2016 to December 31, 2017.
Non-derivative financial instruments. The Company is a borrower under fixed rate debt instruments and, from time to time, under a variable rate debt instrument that gives rise to interest rate risk. The Company's objective in borrowing under fixed or variable rate debt is to satisfy capital requirements while minimizing the Company's costs of capital. The Company also enters into oil and gas purchase andseparate sale transactions with third parties to satisfy unused pipeline capacity commitments and to diversify a portion of the Company's oil and gas sales to (i) Gulf Coast refineries, (ii) Gulf Coast and West Coast gas markets and (iii) international oil markets and to satisfy unused gas pipeline capacity commitments.
Marketing derivatives. The Company's marketing derivatives reflect two long-term marketing contracts that were entered in October 2019. Under the contract terms, beginning on January 1, 2021, the Company agreed to purchase and simultaneously sell 50 thousand barrels of oil per day at an oil terminal in Midland, Texas for a six-year term that ends on December 31, 2026. The price the Company pays to purchase the oil volumes under the purchase contract is based on a Midland WTI price and the price the Company receives for the oil volumes sold is a weighted average sales price ("WASP") that a non-affiliated counterparty receives for selling oil through their Gulf Coast storage and export facility at prices that are highly correlated with Brent oil prices during the same month of the purchase. Similar to sales of purchased commodities, marketing derivatives allow the Company to diversify a portion of its oil sales from its area of production to Gulf Coast and international markets.
The average forward prices based on December 31, 2020 market quotes are as follows:
Year Ending
December 31, 2021December 31, 2022December 31, 2023December 31, 2024December 31, 2025December 31, 2026
Average forward Brent oil price$51.24 $50.03 $49.58 $49.36 $49.25 $49.22 
Average forward WTI Midland oil price$48.94 $47.15 $45.99 $45.44 $45.14 $44.81 
Average forward basis differential price (a)$(2.30)$(2.88)$(3.59)$(3.92)$(4.11)$(4.41)

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The average forward prices based on February 23, 2021 market quotes are as follows:
Year Ending
December 31, 2021December 31, 2022December 31, 2023December 31, 2024December 31, 2025December 31, 2026
Average forward Brent oil price$62.36 $58.29 $56.20 $55.11 $54.63 $54.49 
Average forward WTI Midland oil price$60.03 $55.27 $52.65 $51.22 $50.63 $50.35 
Average forward basis differential price (a)$(2.33)$(3.02)$(3.55)$(3.89)$(4.00)$(4.14)
___________________
(a)Based on market quotes for basis differentials between Midland oil index prices and the Brent oil index price.
Credit risk. The Company's primary concentration of credit risks are associated with the collection of receivables resulting from the sale of oil and gas production and purchased oil and gas, and the risk of a counterparty's failure to meet its obligations under derivative contracts with the Company.
The Company's commodities are sold to various purchasers who must be prequalified under the Company's credit risk policies and procedures. The Company monitors exposure to counterparties primarily by reviewing credit ratings, financial criteria and payment history. Where appropriate, the Company obtains assurances of payment, such as a guarantee by the parent company of the counterparty, a letter of credit or other credit support. Historically, the Company's credit losses on commodity receivables have not been material.
The Company uses credit and other financial criteria to evaluate the credit standing of, and to select, counterparties to its derivative instruments. Although the Company does not obtain collateral or otherwise secure the fair value of its derivative instruments, associated credit risk is mitigated by the Company's credit risk policies and procedures.
The Company has entered into International Swap Dealers Association Master Agreements ("ISDA Agreements") with each of its derivative counterparties. The terms of the ISDA Agreements provide the Company and the counterparties with right of set off upon the occurrence of defined acts of default by either the Company or a counterparty to a Gulf Coast or export market price.derivative contract, whereby the party not in default may set off all derivative liabilities owed to the defaulting party against all derivative asset receivables from the defaulting party. See Note G5 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a discussion of the Company's debt instruments.

additional information.
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ITEM 8.FINANCIAL STATEMENTS AND SUPPLEMENTAL DATA
Derivative financial instruments. The Company, from time to time, utilizes commodity price and interest rate derivative contracts to mitigate commodity price and interest rate risks in accordance with policies and guidelines approved by the Board. In accordance with those policies and guidelines, the Company's executive management determines the appropriate timing and extent of derivative transactions.

ITEM 8.FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA
INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
Page
Reference



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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the Stockholders and the Board of Directors of Pioneer Natural Resources Company
Opinion on the Financial Statements
We have audited the accompanying consolidated balance sheets of Pioneer Natural Resources Company (the Company) as of December 31, 20172020 and 2016, and2019, the related consolidated statements of operations, equity and cash flows for each of the three years in the period ended December 31, 2017,2020, and the related notes (collectively(collectively referred to as the “consolidated"consolidated financial statements”statements"). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 20172020 and 2016,2019, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2017,2020, in conformity with U.S. generally accepted accounting principles.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of December 31, 2017,2020, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework),and our report dated February 20, 2018March 1, 2021 expressed an unqualifiedadverse opinion thereon.
Basis for Opinion
These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company’sCompany's financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.
Critical Audit Matters
The critical audit matters communicated below are matters arising from the current period audit of the financial statements that were communicated or required to be communicated to the audit committee and that: (1) relate to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective or complex judgments. The communication of critical audit matters does not alter in any way our opinion on the consolidatedfinancial statements, taken as a whole, and we are not, by communicating the critical audit matters below, providing separate opinions on the critical audit matters or on the accounts or disclosures to which they relate.
Depreciation, Depletion and Amortization of Proved Oil and Gas Properties
Description of the Matter
At December 31, 2020, the net book value of the Company's proved oil and gas properties was $13,863 million, and depreciation, depletion and amortization (DD&A) expense was $1,639 million for the year then ended. As described in Note 2, under the successful efforts method of accounting, capitalized costs of proved properties are depleted using the units-of-production method based on proved reserves, as estimated by the Company's engineers. Proved oil and gas reserve estimates are based on geological and engineering interpretation and judgment. Significant judgment is required by the Company's engineers in evaluating geological and engineering data when estimating proved oil and gas reserves. Estimating reserves also requires the selection of inputs, including oil and gas price assumptions, future operating and capital cost assumptions and tax rates by jurisdiction, among others. Because of the complexity involved in estimating oil and gas reserves, management used independent petroleum engineers to audit the estimates prepared by the Company's engineers as of December 31, 2020.

Auditing the Company's DD&A calculation is especially complex because of the use of the work of the Company's engineers and the independent petroleum engineers and the evaluation of management's determination of the inputs described above used by the engineers in estimating proved oil and gas reserves.

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How We Addressed the Matter in Our Audit
We obtained an understanding, evaluated the design and tested the operating effectiveness of the Company's controls over its process to calculate DD&A, including management’s controls over the completeness and accuracy of the financial data provided to the engineers for use in estimating proved oil and gas reserves.
Our audit procedures included, among others, evaluating the professional qualifications and objectivity of the Company's engineers responsible for the preparation of the reserve estimates and the independent petroleum engineers used to audit the estimates. In addition, in assessing whether we can use the work of the engineers we evaluated the completeness and accuracy of the financial data and inputs described above used by the engineers in estimating proved oil and gas reserves by agreeing them to source documentation and we identified and evaluated corroborative and contrary evidence. For proved undeveloped reserves, we evaluated management's development plan for compliance with SEC requirements. We also tested the mathematical accuracy of the DD&A calculations, including comparing the proved oil and gas reserves amounts used to the Company’s reserve report.
Convertible Senior Notes
Description of the Matter
As discussed in Note 7 to the consolidated financial statements, in May 2020, the Company issued $1.3 billion convertible senior notes (the "Convertible Senior Notes"). Concurrent with the issuance of the Convertible Senior Notes, the Company entered into call transactions that are exercisable upon conversion of the Convertible Senior Notes (collectively with the Convertible Senior Notes referred to as the "Convertible Senior Notes Transactions"). The accounting for the Convertible Senior Notes Transactions was complex as it required assessment as to whether features in the Convertible Senior Notes required bifurcation and an evaluation of the appropriate classification of those features in the financial statements. Additionally, the Convertible Senior Notes Transactions were complex as valuation of the conversion feature in the Convertible Senior Notes involved estimation of the fair value of the liability component of the Convertible Senior Notes on a stand-alone basis.

Auditing management's evaluation of the Convertible Senior Notes Transactions involved addressing the complexity in assessing the components for separability and assessing valuation of the liability component on a stand-alone basis. The Company estimated the fair value of the liability component of the Convertible Senior Notes using a discounted cash flow model. This model utilized inputs such as contractual interest rate and repayment terms, risk-free interest rate, benchmark forward yield curves and the average term-yield on the Company's existing non-convertible debt. The fair value of the liability component is sensitive to changes in the discount rate. The Company also performed a detailed analysis of the terms of the Convertible Senior Notes Transactions to identify whether there were any embedded derivatives that required separate identification and valuation under applicable accounting guidance.
How We Addressed the Matter in Our Audit
We obtained an understanding, evaluated the design and tested the operating effectiveness of the Company's controls over its accounting for the Convertible Senior Notes Transactions, including its controls over the estimation of the fair value of the stand-alone liability component and evaluating the existence of embedded derivatives.
To test the initial accounting for the Convertible Senior Notes Transactions, our procedures included, among others, inspection of the agreements for the Convertible Senior Notes Transactions and assessing management’s application of the relevant accounting guidance. We also involved our valuation specialists to assist in our evaluation of the Company’s determination of the fair value of the liability component on a stand-alone basis, including testing the appropriateness of the methodology and the discount rate.
/s/ Ernst & Young LLP
We have served as the Company's auditor since 1998.
Dallas, Texas
March 1, 2021
We have served as the Company’s auditor since 1998.
Dallas, Texas
February 20, 2018


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PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS
(in millions)
 December 31,
 20202019
ASSETS
Current assets:
Cash and cash equivalents$1,442 $631 
Restricted cash59 74 
Accounts receivable:
Trade, net695 1,032 
Due from affiliates
Income taxes receivable
Inventories224 205 
Derivatives32 
Investment in affiliate123 187 
Other43 20 
Total current assets2,595 2,191 
Oil and gas properties, using the successful efforts method of accounting:
Proved properties23,934 22,444 
Unproved properties576 584 
Accumulated depletion, depreciation and amortization(10,071)(8,583)
Total oil and gas properties, net14,439 14,445 
Other property and equipment, net1,584 1,632 
Operating lease right-of-use assets197 280 
Goodwill261 261 
Derivatives21 
Other assets150 258 
$19,229 $19,088 
 December 31,
 2017 2016
ASSETS
Current assets:   
Cash and cash equivalents$896
 $1,118
Short-term investments1,218
 1,441
Accounts receivable:   
Trade, net639
 517
Due from affiliates1
 1
Income taxes receivable7
 3
Inventories212
 181
Derivatives11
 14
Other26
 23
Total current assets3,010
 3,298
Property, plant and equipment, at cost:   
Oil and gas properties, using the successful efforts method of accounting:   
Proved properties20,404
 18,566
Unproved properties558
 486
Accumulated depletion, depreciation and amortization(9,196) (8,211)
Total property, plant and equipment11,766
 10,841
Long-term investments66
 420
Goodwill270
 272
Other property and equipment, net1,759
 1,529
Other assets, net132
 99
 $17,003
 $16,459

























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


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PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED BALANCE SHEETS (continued)
(in millions, except share data)
 December 31,
 20202019
LIABILITIES AND EQUITY
Current liabilities:
Accounts payable:
Trade$928 $1,221 
Due to affiliates102 190 
Interest payable35 53 
Income taxes payable
Current portion of long-term debt140 450 
Derivatives234 12 
Operating leases100 136 
Other363 431 
Total current liabilities1,906 2,496 
Long-term debt3,160 1,839 
Derivatives66 
Deferred income taxes1,366 1,393 
Operating leases110 170 
Other liabilities1,052 1,046 
Equity:
Common stock, $.01 par value; 500,000,000 shares authorized; 175,525,268 and 175,057,889
   shares issued as of December 31, 2020 and 2019, respectively
Additional paid-in capital9,323 9,161 
Treasury stock, at cost; 11,047,856 and 9,511,248 shares as of December 31, 2020 and 2019,
   respectively
(1,234)(1,069)
Retained earnings3,478 4,042 
Total equity11,569 12,136 
Commitments and contingencies00
$19,229 $19,088 
 December 31,
 2017 2016
LIABILITIES AND EQUITY
Current liabilities:   
Accounts payable:   
Trade$1,174
 $741
Due to affiliates108
 134
Interest payable59
 68
Current portion of long-term debt449
 485
Derivatives232
 77
Other106
 61
Total current liabilities2,128
 1,566
Long-term debt2,283
 2,728
Derivatives23
 7
Deferred income taxes899
 1,397
Other liabilities391
 350
Equity:   
Common stock, $.01 par value; 500,000,000 shares authorized; 173,796,743 and 173,221,845 shares issued as of December 31, 2017 and 2016, respectively2
 2
Additional paid-in capital8,974
 8,892
Treasury stock, at cost; 3,608,132 and 3,497,742 shares as of December 31, 2017 and 2016, respectively(249) (218)
Retained earnings2,547
 1,728
Total equity attributable to common stockholders11,274
 10,404
Noncontrolling interest in consolidated subsidiaries5
 7
Total equity11,279
 10,411
Commitments and contingencies
 
 $17,003
 $16,459






















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


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PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF OPERATIONS
(in millions, except per share data)
 Year Ended December 31,
 202020192018
Revenues and other income:
Oil and gas$3,630 $4,916 $4,991 
Sales of purchased commodities3,394 4,755 4,388 
Interest and other income (loss), net(67)76 38 
Derivative gain (loss), net(281)55 (292)
Gain (loss) on disposition of assets, net(477)290 
6,685 9,325 9,415 
Costs and expenses:
Oil and gas production682 874 855 
Production and ad valorem taxes242 299 284 
Depletion, depreciation and amortization1,639 1,711 1,534 
Purchased commodities3,633 4,472 3,930 
Impairment of oil and gas properties77 
Exploration and abandonments47 58 114 
General and administrative244 324 381 
Accretion of discount on asset retirement obligations10 14 
Interest129 121 126 
Other321 448 849 
6,946 8,317 8,164 
Income (loss) before income taxes(261)1,008 1,251 
Income tax benefit (provision)61 (235)(276)
Net income (loss)(200)773 975 
Net loss attributable to noncontrolling interests
Net income (loss) attributable to common stockholders$(200)$773 $978 
Net income (loss) per share attributable to common stockholders:
Basic$(1.21)$4.60 $5.71 
Diluted$(1.21)$4.59 $5.70 
Basic and diluted weighted average shares outstanding165 167 171 
 Year Ended December 31,
 2017 2016 2015
Revenues and other income:     
Oil and gas$3,518
 $2,418
 $2,178
Sales of purchased oil and gas1,776
 1,091
 700
Interest and other53
 32
 22
Derivative gains (losses), net(100) (161) 879
Gain on disposition of assets, net208
 2
 782
 5,455
 3,382
 4,561
Costs and expenses:     
Oil and gas production591
 581
 717
Production and ad valorem taxes215
 136
 145
Depletion, depreciation and amortization1,400
 1,480
 1,385
Purchased oil and gas1,807
 1,155
 739
Impairment of oil and gas properties285
 32
 1,056
Exploration and abandonments106
 119
 99
General and administrative326
 325
 327
Accretion of discount on asset retirement obligations19
 18
 12
Interest153
 207
 187
Other244
 288
 315
 5,146
 4,341
 4,982
Income (loss) from continuing operations before income taxes309
 (959) (421)
Income tax benefit524
 403
 155
Income (loss) from continuing operations833
 (556) (266)
Loss from discontinued operations, net of tax
 
 (7)
Net income (loss) attributable to common stockholders$833
 $(556) $(273)
      
Basic net income (loss) per share attributable to common stockholders:     
Income (loss) from continuing operations$4.86
 $(3.34) $(1.79)
Loss from discontinued operations
 
 (0.04)
Net income (loss)$4.86
 $(3.34) $(1.83)
Diluted net income (loss) per share attributable to common stockholders:     
Income (loss) from continuing operations$4.85
 $(3.34) $(1.79)
Loss from discontinued operations
 
 (0.04)
Net income (loss)$4.85
 $(3.34) $(1.83)
      
Basic and diluted weighted average shares outstanding170
 166
 149














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


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CONSOLIDATED STATEMENTS OF EQUITY
(in millions, except share data and dividends per share)
 Shares
Outstanding
Common
Stock
Additional
Paid-in
Capital
Treasury
Stock
Retained
Earnings
Noncontrolling
Interests
Total
Equity
(in thousands)
Balance as of December 31, 2017170,189 $$8,974 $(249)$2,547 $$11,279 
Dividends declared ($0.32 per share)— — — — (55)— (55)
Exercise of long term incentive plan stock options and employee stock purchases58 — — — 
Purchase of treasury stock(1,272)— — (179)— — (179)
Compensation costs:
Vested compensation awards, net524 — — — — — 
Compensation costs included in net income— — 85 — — — 85 
Sale of noncontrolling interest— — — — (2)(2)
Net income— — — — 978 (3)975 
Balance as of December 31, 2018169,499 $$9,062 $(423)$3,470 $$12,111 
Dividends declared ($1.20 per share)— — — — (201)— (201)
Exercise of long-term incentive plan stock options and employee stock purchases64 — (1)— — 
Purchase of treasury stock(4,753)— — (653)— — (653)
Compensation costs:

Vested compensation awards, net737 — — — — — 
Compensation costs included in net income— — 100 — — — 100 
Net income— — — — 773 773 
Balance as of December 31, 2019165,547 $$9,161 $(1,069)$4,042 $$12,136 
   Equity Attributable to Common Stockholders   
 
Shares
Outstanding
 
Common
Stock
 
Additional
Paid-in
Capital
 
Treasury
Stock
 
Retained
Earnings
 
Noncontrolling
Interests
 
Total
Equity
 (in thousands)
            
Balance as of December 31, 2014148,905
 $2
 $6,167
 $(171) $2,583
 $8
 $8,589
Dividends declared ($0.08 per share)
 
 
 
 (12) 
 (12)
Employee stock purchases58
 
 3
 3
 
 
 6
Purchase of treasury stock(201) 
 
 (31) 
 
 (31)
Tax benefits related to stock-based compensation
 
 7
 
 
 
 7
Compensation costs:             
Vested compensation awards, net618
 
 
 
 
 
 
Compensation costs included in net loss
 
 90
 
 
 
 90
Distributions to noncontrolling interests
 
 
 
 
 (1) (1)
Net loss
 
 
 
 (273) 
 (273)
Balance as of December 31, 2015149,380
 $2
 $6,267
 $(199) $2,298
 $7
 $8,375
Issuance of common stock19,838
 
 2,534
 
 
 
 2,534
Dividends declared ($0.08 per share)
 
 
 
 (14) 
 (14)
Exercise of long-term incentive plan stock options and employee stock purchases98
 
 1
 6
 
 
 7
Purchase of treasury stock(200) 
 
 (25) 
 
 (25)
Tax benefits related to stock-based compensation
 
 1
 
 
 
 1
Compensation costs:            
Vested compensation awards, net608
 
 
 
 
 
 
Compensation costs included in net loss
 
 89
 
 
 
 89
Net loss
 
 
 
 (556) 
 (556)
Balance as of December 31, 2016169,724
 $2
 $8,892
 $(218) $1,728
 $7
 $10,411




























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

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PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF EQUITY (continued)
(in millions, except share data and dividends per share)
 Shares
Outstanding
Common
Stock
Additional
Paid-in
Capital
Treasury
Stock
Retained
Earnings
Total
Equity
(in thousands)
Balance as of December 31, 2019165,547 $$9,161 $(1,069)$4,042 $12,136 
Dividends declared ($2.20 per share)— — — — (364)(364)
Convertible senior notes:
Equity component— — 230 — — 230 
Capped call— — (113)— — (113)
Deferred tax provision— — (25)— — (25)
Exercise of long-term incentive plan stock options and employee stock purchases98 — (2)11 — 
Purchases of treasury stock(1,634)— — (176)— (176)
Compensation costs:
Vested compensation awards, net466 — — — — 
Compensation costs included in net loss— — 72 — — 72 
Net loss— — — — (200)(200)
Balance as of December 31, 2020164,477 $$9,323 $(1,234)$3,478 $11,569 
   Equity Attributable to Common Stockholders    
 
Shares
Outstanding
 
Common
Stock
 
Additional
Paid-in
Capital
 
Treasury
Stock
 
Retained
Earnings
 
Noncontrolling
Interests
 
Total
Equity
 (in thousands)
            
Balance as of December 31, 2016169,724
 $2
 $8,892
 $(218) $1,728
 $7
 $10,411
Dividends declared ($0.08 per share)
 
 
 
 (14) 
 (14)
Exercise of long-term incentive plan stock options and employee stock purchases81
 
 1
 5
 
 
 6
Purchases of treasury stock(191) 
 
 (36) 
 
 (36)
Compensation costs:             
Vested compensation awards575
 
 
 
 
 
 
Compensation costs included in net income��
 
 79
 
 
 
 79
Purchase of noncontrolling interest
 
 2
 
 
 (2) 
Net income
 
 
 
 833
 
 833
Balance as of December 31, 2017170,189
 $2
 $8,974
 $(249) $2,547
 $5
 $11,279























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


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PIONEER NATURAL RESOURCES COMPANY

CONSOLIDATED STATEMENTS OF CASH FLOWS
(in millions)
Year Ended December 31, Year Ended December 31,
2017 2016 2015 202020192018
Cash flows from operating activities:     Cash flows from operating activities:
Net income (loss)$833
 $(556) $(273)Net income (loss)$(200)$773 $975 
Adjustments to reconcile net income (loss) to net cash provided by operating activities:     Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depletion, depreciation and amortization1,400
 1,480
 1,385
Depletion, depreciation and amortization1,639 1,711 1,534 
Impairment of oil and gas properties285
 32
 1,056
Impairment of oil and gas properties77 
Impairment of inventory and other property and equipment2
 8
 86
Impairment of inventory and other property and equipment38 11 
Exploration expenses, including dry holes22
 42
 28
Exploration expenses, including dry holes11 27 
Deferred income taxes(519) (379) (178)Deferred income taxes(52)240 274 
Gain on disposition of assets, net(208) (2) (782)
Gain (loss) on disposition of assets, netGain (loss) on disposition of assets, net(9)477 (290)
Loss on early extinguishment of debtLoss on early extinguishment of debt27 
Accretion of discount on asset retirement obligations19
 18
 12
Accretion of discount on asset retirement obligations10 14 
Discontinued operations
 
 (4)
Interest expense5
 13
 18
Interest expense51 
Derivative related activity174
 851
 (3)Derivative related activity325 (8)(270)
Amortization of stock-based compensation79
 89
 90
Amortization of stock-based compensation72 100 85 
Investment in affiliate valuation adjustmentInvestment in affiliate valuation adjustment64 (15)
South Texas contingent consideration valuation adjustmentSouth Texas contingent consideration valuation adjustment42 45 
South Texas deficiency fee obligation, netSouth Texas deficiency fee obligation, net80 
Other74
 67
 45
Other125 105 658 
Change in operating assets and liabilities     
Change in operating assets and liabilities:Change in operating assets and liabilities:
Accounts receivable(122) (134) 54
Accounts receivable309 (227)(52)
Income taxes receivable(4) 40
 (20)
Inventories(35) (32) 8
Inventories(20)(20)(70)
Derivatives
 (24) 
Investments8
 (22) 
Other current assets(3) (7) 
Other assetsOther assets24 (33)
Accounts payable134
 58
 (258)Accounts payable(179)(7)321 
Interest payable(9) 3
 25
Interest payable(19)(5)
Other current liabilities(45) (46) (34)
Other liabilitiesOther liabilities(219)(91)(55)
Net cash provided by operating activities2,090
 1,499
 1,255
Net cash provided by operating activities2,083 3,115 3,242 
Cash flows from investing activities:     Cash flows from investing activities:
Proceeds from disposition of assets, net of cash sold352
 507
 553
Proceeds from disposition of assets, net of cash sold60 149 469 
Payments for acquisitions
 (428) 
Proceeds from investments1,465
 902
 
Proceeds from investments624 1,373 
Purchase of investments(899) (2,741) 
Purchase of investments(1)(669)
Additions to oil and gas properties(2,365) (1,857) (2,110)Additions to oil and gas properties(1,602)(2,988)(3,520)
Additions to other assets and other property and equipment, net(336) (203) (283)Additions to other assets and other property and equipment, net(125)(232)(263)
Net cash used in investing activities(1,783) (3,820) (1,840)Net cash used in investing activities(1,668)(2,447)(2,610)
Cash flows from financing activities:     Cash flows from financing activities:
Borrowings of long-term debt
 
 998
Principal payments on long-term debt(485) (455) 
Proceeds from issuance of common stock, net of issuance costs
 2,534
 
Distributions to noncontrolling interests
 
 (1)
Proceeds from issuance of senior notes, net of discountProceeds from issuance of senior notes, net of discount1,091 
Proceeds from issuance of convertible senior notesProceeds from issuance of convertible senior notes1,323 
Purchase of derivatives related to issuance of convertible senior notesPurchase of derivatives related to issuance of convertible senior notes(113)
Borrowing under credit facilityBorrowing under credit facility800 
Repayment of credit facilityRepayment of credit facility(800)
Repayment of senior notes, including tender offer premiumsRepayment of senior notes, including tender offer premiums(1,198)(450)
Payments of other liabilitiesPayments of other liabilities(173)(14)(23)
Payments of financing feesPayments of financing fees(36)(4)
Purchases of treasury stockPurchases of treasury stock(176)(653)(179)
Exercise of long-term incentive plan stock options and employee stock purchases6
 7
 6
Exercise of long-term incentive plan stock options and employee stock purchases
Purchases of treasury stock(36) (25) (31)
Payments of financing fees
 
 (9)
Dividends paid(14) (13) (12)Dividends paid(346)(127)(55)
Net cash provided by (used in) financing activities(529) 2,048
 951
Net cash provided by (used in) financing activities381 (788)(703)
Net increase (decrease) in cash and cash equivalents(222) (273) 366
Cash and cash equivalents, beginning of period1,118
 1,391
 1,025
Cash and cash equivalents, end of period$896
 $1,118
 $1,391
Net increase (decrease) in cash, cash equivalents and restricted cashNet increase (decrease) in cash, cash equivalents and restricted cash796 (120)(71)
Cash, cash equivalents and restricted cash, beginning of periodCash, cash equivalents and restricted cash, beginning of period705 825 896 
Cash, cash equivalents and restricted cash, end of periodCash, cash equivalents and restricted cash, end of period$1,501 $705 $825 
The accompanying notes are an integral part of these consolidated financial statements.


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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 20152018


NOTE A.1. Organization and Nature of Operations
Pioneer Natural Resources Company ("Pioneer" or the "Company") 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 that explores for, develops and produces oil, natural gas liquids ("NGLs") and gas within the United States, with operations primarily in the Permian Basin in West Texas,Texas.
Impact of the Eagle Ford Shale playCOVID-19 Pandemic. A novel strain of the coronavirus ("COVID-19") surfaced in South Texas,late 2019 and has spread around the Raton field in southeast Coloradoworld, including to the United States. In March 2020, the World Health Organization declared COVID-19 a pandemic, and the West Panhandle fieldPresident of the United States declared the COVID-19 outbreak a national emergency. The COVID-19 pandemic has significantly affected the global economy, disrupted global supply chains and created significant volatility in the Texas Panhandle.financial markets. In addition, the COVID-19 pandemic has resulted in travel restrictions, business closures and other restrictions that have disrupted the demand for oil throughout the world and when combined with pressures on the global supply-demand balance for oil and related products, resulted in significant volatility in oil prices beginning in late February 2020. The length of this demand disruption is unknown, and will ultimately depend on various factors beyond the Company's control, such as the duration and scope of the pandemic, the length and severity of the worldwide economic downturn, the ability of OPEC, Russia and other oil producing nations to manage the global oil supply, additional actions by businesses and governments in response to the pandemic, the speed and effectiveness of responses to combat the virus, including the effectiveness of the COVID-19 vaccines, and the time necessary to balance oil supply and demand. Additionally, there is significant uncertainty regarding the lasting impacts of the pandemic on global demand, as it cannot be predicted as to whether certain demand-reducing behaviors such as declines in business travel and changes in work-from-home practices will persist beyond the resolution of the pandemic. The length of this demand disruption is unknown, and there is significant uncertainty regarding the long-term impact of the effects of the COVID-19 pandemic to global oil demand, which has negatively impacted the Company's results of operations and led to a significant reduction in the Company's 2020 capital activities.
NOTE B.2. Summary of Significant Accounting Policies
Principles of consolidation. The consolidated financial statements include the accounts of the Company and its wholly-owned and majority-owned subsidiaries since their acquisition or formation. All material intercompany balances and transactions have been eliminated.
Certain reclassificationsCorrection of previously issued financial statements. During the Company's review of its marketing contracts during the fourth quarter of 2020, the Company identified two long-term marketing contracts that should have been accounted for as derivative contracts. The contracts were entered in October 2019, each with a January 1, 2021 contract commencement date and a December 31, 2026 contract termination date. In order to properly account for the contracts as derivatives, certain noncash revisions have been made to the 2016 and 20152019 consolidated financial statement and footnote amounts in order to conform them to the 2017 presentations.
statements. In addition, the presentationunaudited consolidated financial statements for the first three quarters of certain purchases2020 were revised or restated accordingly.
In accordance with Staff Accounting Bulletin ("SAB") No. 99, Materiality, and salesSAB No. 108, Considering the Effects of third-party oilPrior Year Misstatements when Quantifying Misstatements in Current Year Financial Statements, the Company evaluated the misstatements and, gas withbased on an analysis of quantitative and qualitative factors, determined that the same counterparty has been revised in 2016 and 2015 to present such transactions on a net basis in purchased oil and gas expense. Previously, these transportation arrangements, which were carried out as purchases from and sales to the same third party, were separately stated on a gross basis in sales of purchased oil and gas and purchased oil and gas expense. This revision did notrelated impact the Company's balance sheet, net income (loss) from continuing operations, equity or cash flows. Whilewas not material to the 2016 and 2015Company's 2019 annual consolidated financial statements as a whole,or interim periods prior to September 30, 2020; however, the presentationCompany determined that the impact of the misstatement to its interim period ending September 30, 2020 was material. In accordance with Accounting Standards Codification 250, Accounting Changes and Error Corrections, the Company has been revisedcorrected the misstatement for the year ended December 31, 2019 by revising the consolidated financial statements appearing herein. The net impact of these immaterial corrections to enhance consistency. The following individual line itemsthe Company's previously reported consolidated financial statements for the year ended December 31, 2019 is shown below. In addition, see Selected Quarterly Financial Results for revisions and restatements to the Company's previously issued unaudited interim consolidated financial statements that were affected, in addition to total revenuesimpacted by this misstatement.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and total costs and expenses:
2018
 Year Ended December 31,
 2016 2015
 (in millions)
Sales of purchased oil and gas, as previously reported$1,533
 $964
Revision to sales of purchased oil and gas(442) (264)
Sales of purchased oil and gas, reported herein$1,091
 $700
    
Purchased oil and gas, as previously reported$1,597
 $1,003
Revision to purchased oil and gas(442) (264)
Purchased oil and gas, reported herein$1,155
 $739
Consolidated balance sheet (in millions):
December 31, 2019
As ReportedRevisionsAs Revised
ASSETS
Derivatives$$21 $21 
Total assets$19,067 $21 $19,088 
LIABILITIES AND EQUITY
Deferred income taxes$1,389 $$1,393 
Retained earnings$4,025 $17 $4,042 
Total equity$12,119 $17 $12,136 
Total liabilities and equity$19,067 $21 $19,088 
Consolidated statement of operations (in millions, except per share data):
December 31, 2019
As ReportedRevisionsAs Revised
Derivative gain, net$34 $21 $55 
Income before income taxes$987 $21 $1,008 
Income tax provision$(231)$(4)$(235)
Net income$756 $17 $773 
Net income attributable to common stockholders$756 $17 $773 
Net income per share attributable to common stockholders:
Basic$4.50 $0.10 $4.60 
Diluted$4.50 $0.09 $4.59 
These revisions had no effect on the Company's previously reported year ended 2019 net cash flows from operating activities, investing activities or financing activities.
Use of estimates in the preparation of financial statements. Preparation of the accompanyingCompany's consolidated financial statements in conformity with generally accepted accounting principles in the United States ("GAAP") requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Depletion of oil and gas properties and impairment of goodwill and proved and unproved oil and gas properties, in part, is determined using estimates of proved probable and possible oil and gas reserves. There are numerous uncertainties inherent in the estimation of quantities of proved probable and possible reserves and in the projection of future rates of production and the timing of development expenditures. Similarly, evaluations for impairment of proved and unproved oil and gas properties are subject to numerous uncertainties including, among others, estimates of future recoverable reserves, and commodity price outlooks.outlooks and prevailing market rates of other sources of income and costs. Actual results could differ from the estimates and assumptions utilized.
Cash and cash equivalents. The Company's cash and cash equivalents include depository accounts held by banks and marketable securities (including commercial paper and time deposits) with original issuance maturities of 90 days or less.
Investments. Periodically,Restricted cash.The Company's restricted cash includes funds held in escrow to cover future deficiency fee payments in connection with the Company's 2019 sale of its Eagle Ford assets and other remaining assets in South Texas (the "South Texas Divestiture"). Beginning in 2021, the required escrow balance declines and, to the extent there is any remaining balance after the payment of deficiency fees, the balance will become unrestricted and revert to the Company investson March 31, 2023. Interest income related to restricted cash is recorded in commercial paperinterest and corporate bonds with investment grade rated entities. The Company also periodically enters into time deposits with financial institutions. Commercial paper and time deposits are included in cash and cash equivalents if they have maturity dates that are less than 90 days at the date of purchase; otherwise,

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


investments are reflected in short-term investments or long-term investmentsother income in the accompanying consolidated balance sheets based on their maturity dates.statements of operations.
Accounts receivable. As of December 31, 2017 and 2016, the Company had accounts receivable – trade, net of allowances for bad debts, of $639 million and $517 million, respectively. The Company's accounts receivable – trade are primarily comprised of oil and gas sales receivables, joint interest receivables and other receivables for which the Company does not require collateral security. The
As

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 20172020, 2019 and 2016,2018
Company's share of oil and gas production is sold to various purchasers who must be prequalified under the Company's credit risk policies and procedures. The Company records allowances for doubtful accounts based on historical collection experience, current and future economic and market conditions, the length of time that the accounts receivables have been outstanding and the financial condition of its purchasers. The Company's credit risk related to collecting accounts receivables is mitigated by using credit and other financial criteria to evaluate the credit standing of the entity obligated to make payment on the accounts receivable, and where appropriate, the Company obtains assurances of payment, such as a guarantee by the parent company of the counterparty letters of credit or other credit support.
The Company's allowance for doubtful accounts totaled $1$3 million and $2 million as of December 31, 2020 and 2019, respectively. On January 1, 2020, the Company adopted Accounting Standards Update ("ASU") 2016-13, "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" ("ASU 2016-13") prospectively. This ASU replaced the incurred loss impairment model with an expected credit loss impairment model for both respective periods.financial instruments, including trade receivables. The amendment requires the Company to consider forward-looking information to estimate expected credit losses, resulting in earlier recognition of losses for receivables that are current or not yet due, which were not considered under the previous accounting guidance. As a result of adopting ASU 2016-13, the Company establishes allowances for bad debts equal to the estimable portions of accounts receivable for which failure to collect is considered probable.expected to occur. The Company estimates the portions ofuncollectible amounts for joint interest receivables for which failure to collect is probable based on percentages of joint interest receivables that are past due. The Company estimates the portions of other receivables for which failure to collect is probable based on the relevant factslength of time that the accounts receivables have been outstanding, historical collection experience and circumstances surrounding the receivable.current and future economic and market conditions. Allowances for doubtful accounts are recorded as reductions to the carrying values of the receivables included in the Company's accompanying consolidated balance sheets and as charges toare recorded in other expense in the accompanying consolidated statements of operations in the accounting periods during which failure to collect an estimable portion is determined to be probable.
Inventories. The Company's inventories consist of materials, supplies and commodities. The Company's materials and supplies inventory is primarily comprised of oil and gas drilling or repair items such as tubing, casing, proppant used to fracture-stimulate oil and gas wells, water, chemicals, operating supplies and ordinary maintenance materials and parts.repair parts, water, chemicals and other operating supplies. The materials and supplies inventory is primarily acquired for use in future drilling and production operations or repair operations and is carried at the lower of cost or market, on a first-in, first-outweighted average cost basis. Valuation allowances for materials and supplies inventories are recorded as reductions to the carrying values of the materials and supplies inventories included in the Company's accompanying consolidated balance sheets and as charges toare recorded in other expense in the accompanying consolidated statements of operations.
Commodity inventories are carried at the lower of cost or market, on a first-in, first-out basis. The Company's commodity inventories consist of oil, NGLs, gas and gasdiesel volumes held in storage or as linefill in pipelines. Any valuation allowances of commodity inventories are recorded as reductions to the carrying values of the commodity inventories included in the Company's accompanying consolidated balance sheets and as charges to other expense in the accompanying consolidated statements of operations.
The following table presentscomponents of inventories are as follows:
As of December 31,
20202019
(in millions)
Materials and supplies (a)$75 $75 
Commodities149 130 
Total inventories$224 $205 
____________________
(a)As of December 31, 2020 and 2019, the Company's materials and supplies inventories were net of valuation allowances of $1 million and commodity inventories$2 million, respectively.
Investment in affiliate.In December 2018, the Company completed the sale of its pressure pumping assets to ProPetro Holding Corp. ("ProPetro") in exchange for cash and 16.6 million shares of ProPetro's common stock, representing an ownership interest in ProPetro of 16 percent. Additionally, in October 2019, Phillip A. Gobe, a nonemployee member of the Company's board of directors, was appointed by the board of directors of ProPetro to serve as its Executive Chairman, and in March 2020 he was appointed as Chief Executive Officer and Chairman of the Board of Directors. Mark S. Berg, the Company's Executive Vice President, Corporate Operations, serves as a member of the ProPetro board of directors under the Company's right acquired upon the sale of its pressure pumping assets to designate a director to the board of directors of ProPetro so long as the Company owns five percent or more of ProPetro's outstanding common stock. Based on the Company's ownership in ProPetro and representation on the ProPetro board of directors, ProPetro is considered an affiliate and deemed to

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 20172020, 2019 and 2016:2018
be a related party. The Company uses the fair value option to account for its equity method investment in ProPetro with any changes in fair value recorded in interest and other income in the consolidated statement of operations. The carrying value of the Company's investment in ProPetro is included in investment in affiliate in the consolidated balance sheets. See Note 4 and Note 12 for additional information.
  As of December 31,
  2017 2016
  (in millions)
Materials and supplies (a) $134
 $144
Commodities 78
 37
  $212
 $181
____________________
(a)As of December 31, 2017 and 2016, the Company's materials and supplies inventories were net of valuation allowances of $5 million and $28 million, respectively. See Note D for additional information regarding inventory impairments.
Oil and gas properties. The Company utilizes the successful efforts method of accounting for its oil and gas properties. Under this method, all costs associated with productive wells and nonproductive development wells are capitalized while nonproductive exploration costs and geological and geophysical expenditures are expensed. The Company capitalizes interest on expenditures for significant development projects, generally when the underlying project is sanctioned, until such projects are ready for their intended use.
The Company does not carry the costs of drilling an exploratory well as an asset in its consolidated balance sheets following the completion of drilling unless both of the following conditions are met:
(i)The well has found a sufficient quantity of reserves to justify its completion as a producing well; and
(ii)The Company is making sufficient progress assessing the reserves and the economic and operating viability of the project.

(i) the well has found a sufficient quantity of reserves to justify its completion as a producing well and (ii) the Company is making sufficient progress assessing the reserves and the economic and operating viability of the project. The Company's exploratory wells include extension wells which extend the limits of a known reservoir.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


Due to the capital-intensive nature and the geographical location of certain projects, it may take an extended period of time to evaluate the future potential of an exploration project and the economics associated with making a determination on its commercial viability. In these instances, the project's feasibility is not contingent upon price improvements or advances in technology, but rather the Company's ongoing efforts and expenditures related to accurately predicting the hydrocarbon recoverability based on well information, gaining access to other companies' production data in the area, transportation or processing facilities, and/or getting partner approval to drill additional appraisal wells. These activities are ongoing and are being pursued constantly. Consequently, the Company's assessment of suspended exploratory well costs is continuous until a decision can be made that the project has found sufficient proved reserves to sanction the project or is noncommercial and is charged to exploration and abandonments expense. See Note F6 for additional information regardinginformation.
As of December 31, 2020, the Company's suspended exploratory well costs.
The Company owns interests in 1011 gas processing plants, and four treating facilities. The Company isincluding the operator of one of the gas processing plants and all four of the treating facilities. Nine of the gas processing plants are operated by third parties and one of the treating facilities is not currently being used.related gathering systems. The Company's ownership interests in the gas processing plants and treating facilities are primarily to accommodate handling the Company's gas production and thus are considered a component of the capital and operating costs of the respective fields that they service. ToThe operator's of the extent that there is excess capacity at a plant or treating facility,plants process the Company attempts to processCompany's and third-party gas volumes for a fee to keep the plant or treating facility at capacity. Allfee. The Company's share of revenues and expenses derived from third-party gas volumes processed through the plants and treating facilities are reported as components of oil and gas production costs. Third-party revenuesRevenues generated from the processing plants and treating facilities in continuing operations for the years ended December 31, 2017, 20162020, 2019 and 20152018 were $60$178 million, $41$140 million and $39$124 million, respectively. Third-party expensesExpenses attributable to the processing plants and treating facilities in continuing operations for the same respective periods were $26$76 million, $24$65 million and $27$75 million. The capitalized costs of the plants and treating facilities are included in proved oil and gas properties and are depleted using the unit-of-production method along with the other capitalized costs of the field that they service.
The capitalized costs of proved properties are depleted using the unit-of-production method based on proved reserves. Costs of significant nonproducing properties, wells in the process of being drilled and development projects are excluded from depletion until the related project is completed and proved reserves are established or, if unsuccessful, impairment is determined.recognized.
Proceeds from the sales of individual properties and the capitalized costs of individual properties sold or abandoned are credited and charged, respectively, to accumulated depletion, depreciation and amortization, if doing so does not materially impact the depletion rate of an amortization base. Generally, no gain or loss is recognizedrecorded until an entire amortization base is sold. However, gain or loss is recognizedrecorded from the sale of less than an entire amortization base if the disposition is significant enough to materially impact the depletion rate of the remaining properties in the amortization base.
The Company performs assessments of its long-lived assets to be held and used, including proved oil and gas properties accounted for under the successful efforts method of accounting, whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. An impairment loss is indicated if the sum of the expected future cash flows, including vertical integrated services that are used in the development of the assets, is less than the carrying amount of the assets, including the carrying value of vertical integrated services assets. In these circumstances, the Company recognizes an impairment losscharge for the amount by which the carrying amount of the assets exceeds the estimated fair value of the assets. See Note DImpairment charges for additional information regarding the Company's impairment of proved oil and gas properties.properties are recorded in impairment of oil and gas properties in the consolidated statements of operations. See Note 4 for additional information.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
Unproved oil and gas properties are periodically assessed for impairment on a project-by-project basis. These impairment assessments are affected by the results of exploration activities, commodity price outlooks, planned future property sales or expirationsexpiration of all or a portion of such projects. If the estimated future net cash flows attributable to such projects are not expected to be sufficient to fully recover the costs invested in each project, the Company will recognize an impairment losscharge at that time. Impairment charges for unproved oil and gas properties are recorded in exploration and abandonments in the consolidated statements of operations.
Goodwill. During 2004, the Company recorded goodwill associated with a business combination, which represents the cost of the acquired entity over the net amounts assigned to assets acquired and liabilities assumed. In accordance with GAAP, goodwill is not amortized to earnings, but Goodwill is assessed for impairment whenever it is more likely than not that events or circumstances indicate that impairment of the carrying value of goodwill is likely,a reporting unit exceeds its fair value, but no less often than annually. IfAn impairment charge is recorded for the amount by which the carrying amount exceeds the fair value of goodwill is determined to be impaired, it is reduced to the impaired value with a corresponding charge to earningsreporting unit in the period in which it is determined to be impaired. During the third quarter of 2017, the
The Company performed its annual qualitative assessment of goodwill during the third quarter of 2020 to determine whether it was more likely than not that the fair value of the Company's reporting unit was less than its carrying amount as a basis for determining whether it was necessary to perform the two-step impairment test.amount. Based on the results of the assessment, the Company determined it was not likely that the carrying value of the Company's goodwill was impaired.reporting unit exceeded its fair value. See Note 4 for additional information.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


Other property and equipment, net. Other property and equipment is recorded at cost. As of December 31, 2017 and 2016, the netThe carrying valuevalues of other property and equipment, consistednet of accumulated depreciation of $463 million and $382 million as of December 31, 2020 and 2019, respectively, are as follows:
As of December 31,
20202019
(in millions)
Land and buildings (a)$849 $877 
Water infrastructure (b)414 404 
Construction-in-progress and capitalized interest (c)174 152 
Information technology71 120 
Transport and field equipment (d)34 35 
Furniture and fixtures27 28 
Sand reserves (e)15 16 
Total other property and equipment, net$1,584 $1,632 
____________________
(a)Includes land, buildings, any related improvements to land and buildings, and a finance lease entered into by the following:Company for its corporate headquarters in Irving, Texas. See Note 10 for additional information.
 As of December 31,
 2017 (a) 2016 (a)
 (in millions)
Land and buildings$529
 $475
Proved and unproved sand properties (b)488
 484
Water infrastructure (c)347
 221
Equipment (d)194
 206
Information technology (e)143
 84
Leasehold improvements20
 22
Vehicles19
 15
Furniture and fixtures19
 22
 $1,759
 $1,529
____________________
(a)At December 31, 2017 and 2016, other property and equipment was net of accumulated depreciation of $936 million and $866 million, respectively.
(b)Includes sand mines, facilities and unproved leaseholds that primarily provide the Company with proppant(b)Includes costs for use in the fracture stimulation of oil and gas wells.
(c)Includes pipeline infrastructure costs and water supply wells.
(d)Includes fracture stimulation and well servicing equipment that is owned by wholly-owned subsidiaries that provide pressure pumping and well services on Company-operated properties. As of December 31, 2017, the Company owned eight fracture stimulation fleets and other oilfield services equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, blowout preventers, construction equipment and fishing tools.
(e)Information technology costs include hardware and software costs associated with the Company's existing systems and in-progress system upgrades. As of December 31, 2017 and 2016, $93 million and $37 million, respectively, had not yet been placed into service.
The primary purpose of the Company's sand mine, pressure pumping, well services and water infrastructure operations is to assistsupply wells.
(c)Includes capitalized costs and capitalized interest on other property and equipment not yet placed in service.
(d)Includes vehicles and well servicing equipment, including pulling units, fracture stimulation tanks, water transport trucks, hot oilers, construction equipment and fishing tools, that are used on Company-operated properties.
(e)Includes sand mines and unproved leaseholds that provide the Company with proppant for use in the executionfracture stimulation of the Company's drilling, completionoil and production operations by increasing the availability of supplies, equipment and services, rather than being dependent on third-party availability, and to contain associated costs. All intercompany profits or losses of the Company's sand mine, pressure pumping, well services and water infrastructure operations are eliminated.gas wells.
The capitalized costs of proved sand properties are depleted using the unit-of-production method based on proved sand reserves. Other property and equipment is depreciated over its estimated useful life on a straight-line basis. Buildings are generally depreciated over 20 to 39 years. Water infrastructure is generally depreciated over three to 50 years. Equipment, vehicles, furniture and fixtures and information technology assets are generally depreciated over twothree to 1510 years. Water infrastructure is generally depreciated over 10 to 50 years. Leasehold improvementsSand reserves are amortized over the lesser of their estimated useful lives or the underlying terms of the associated leases.depleted on a units-of-production basis.
The Company reviews its long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If such assets are considered to be impaired, the impairment to be recognizedrecorded is measured by the amount by which the carrying amount of the asset exceeds its estimated fair value. The estimated fair value is determined using either a discounted future cash flow model or another appropriate fair value method.
Leases. The Company enters into leases for drilling rigs, storage tanks, equipment and buildings and recognizes lease expense on a straight-line basis over the lease term. Lease right-of-use assets and liabilities are initially recorded on the lease commencement date based on the present value of lease payments over the lease term. As most of the Company's lease contracts do not provide an implicit discount rate, the Company uses its incremental borrowing rate, which is determined based

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
on information available at the commencement date of a lease. Leases may include renewal, purchase or termination options that can extend or shorten the term of the lease. The exercise of those options is at the Company's sole discretion and is evaluated at inception and throughout the contract to determine if a modification of the lease term is required. Leases with an initial term of 12 months or less are not recorded as a lease right-of-use asset and liability. See Note 10 for additional information.
Asset retirement obligations. The Company records a liability for the fair value of an asset retirement obligation in the period in which itthe associated asset is incurred,acquired or placed into service, if a reasonable estimate of fair value can be made. Asset retirement obligations are generally capitalized as part of the carrying value of the long-lived asset to which it relates. Conditional asset retirement obligations meet the definition of liabilities and are recognizedrecorded when incurred if theirand when fair valuesvalue can be reasonably estimated.
The Company recordsincludes the current and noncurrent portions of asset retirement obligations in other current liabilities and other liabilities, respectively, in the accompanying consolidated balance sheets and expenditures are classifiedincluded as cash used in operating activities in the accompanying consolidated statements of cash flows. See Note I9 for additional information about the Company's asset retirement obligations.information.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


Treasury stock. Treasury stock purchases are recorded at cost. Upon reissuance, the cost of treasury shares held is reduced by the average purchase price per share of the aggregate treasury shares held.
Issuance of common stock. InRevenue recognition. On January and June of 2016,1, 2018, the Company issued 13.8 million and 6.0 million sharesadopted Accounting Standards Codification ("ASC") 606, "Revenue from Contracts with Customers," ("ASC 606") using the modified retrospective transition method. The adoption did not require an adjustment to retained earnings as there was no material change to the timing or pattern of its common stock, respectively, and realized cash proceedsrevenue recognition due to the adoption of $1.6 billion and $937 million, respectively, net of associated underwriting and offering expenses.
Revenue recognition.ASC 606. The Company recognizes revenue when it is realized or realizable and earned. Revenues are considered realized or realizable and earned when: (i) persuasive evidencecontrol of an arrangement exists, (ii) delivery has occurredthe promised goods or services have been rendered, (iii)is transferred to customers at an amount that reflects the seller'sconsideration to which the Company expects to be entitled in exchange for those goods or services.
Oil sales. Sales under the Company's oil contracts are generally considered performed when the Company sells oil production at the wellhead and receives an agreed-upon index price, net of any price differentials. The Company recognizes the sales revenue when (i) control/custody transfers to the buyerpurchaser at the wellhead and (ii) the net price is fixed or determinable and (iv) collectabilitydeterminable.
NGL and gas sales. Under the majority of the Company's gas processing contracts, gas is reasonably assured.delivered to a midstream processing entity and the Company elects to take residue gas and NGLs in-kind at the tailgate. The Company recognizes revenue when the products are delivered (custody transfer) to the ultimate third-party purchaser at a contractually agreed-upon delivery point at a specified index price.
Sales of purchased commodities. The Company enters into purchase transactions with third parties and separate sale transactions with third parties to diversify a portion of the Company's West Texas Intermediate oil ("WTI")and gas sales to a(i) Gulf Coast or export market pricerefineries, (ii) Gulf Coast and West Coast gas markets and (iii) international oil markets and to satisfy unused gas pipeline capacity commitments. Revenues and expenses from these transactions are generally presented on a gross basis as the Company acts as a principal in the transaction by assuming both the riskrisks and rewards of ownership, including credit risk, of the commodities purchased and assuming the responsibility to deliver the commodities sold. TransportationIn conjunction with the Company's downstream sales, the Company also enters into pipeline capacity commitments in order to secure available oil, NGL and gas transportation capacity from the Company's areas of production to downstream sales points. The transportation costs associated with purchases and sales of third-party oil and gas are presented on a net basis in purchased oil and gas expense. Firm transportation payments on excess pipeline capacitythese transactions are included in other expense inpurchased commodities expense.
See Note 14 for additional information.
Derivatives. All of the accompanying consolidated statements of operations. See Note N for further information on transportation commitment charges.
Derivatives. AllCompany's derivatives are accounted for as non-hedge derivatives and are recorded in the accompanying consolidated balance sheets at estimated fair value. The Company recognizes allvalue in the consolidated balance sheets. All changes in the fair values of its derivative contracts are recorded as gains or losses in the earnings of the periods in which they occur.
The Company enters into derivatives under master netting arrangements, which, in an event of default, allows the Company to offset payables to and receivables from the defaulting counterparty. The Company classifies the fair value amounts of derivative assets and liabilities executed under master netting arrangements as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty.
Net derivative asset values are determined, in part, by utilization of the derivative counterparties' credit-adjusted risk-free rate curves and net derivative liabilities are determined, in part, by utilization of the Company's credit-adjusted risk-free rate

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
curve. The credit-adjusted risk-free rate curves for the Company and the counterparties are based on their independent market-quoted credit default swap rate curves plus the United States Treasury Bill yield curve as of the valuation date.
The Company's credit risk related to derivatives is a counterparty's failure to perform under derivative contracts owed to the Company. The Company uses credit and other financial criteria to evaluate the credit standing of, and to select, counterparties to its derivative instruments. Although the Company does not obtain collateral or otherwise secure the fair value of its derivative instruments, associated credit risk is mitigated by the Company's credit risk policies and procedures.
The Company has entered into International Swap Dealers Association Master Agreements ("ISDA Agreements") with each of its derivative counterparties. The terms of the ISDA Agreements provide the Company and the counterparties with rights of set off upon the occurrence of defined acts of default by either the Company or a counterparty to a derivative, whereby the party not in default may set off all derivative liabilities owed to the defaulting party against all derivative asset receivables from the defaulting party. See Note E5 for additional information about the Company's derivative instruments.information.
Income taxes. The provision for income taxes is determined using the asset and liability approach of accounting for income taxes. Under this approach, deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes and net operating loss and tax credit carryforwards. The amount of deferred taxes on these temporary differences is determined using the tax rates that are expected to apply to the period when the asset is realized or the liability is settled, as applicable, based on tax rates and laws in the respective tax jurisdiction enacted as of the balance sheet date.
The Company reviews its deferred tax assets for recoverability and establishes a valuation allowance based on projected future taxable income, applicable tax strategies and the expected timing of the reversals of existing temporary differences. A valuation allowance is provided when it is more likely than not (likelihood of greater than 50%)50 percent) that some portion or all of the deferred tax assets will not be realized.
The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based upon the technical merits of the position. If all or a portion of the unrecognized tax benefit is sustained upon examination by the taxing authorities, the tax benefit will be recognized as a reduction to the Company's deferred tax liability and will affect the Company's effective tax rate in the period it is recognized. See Note O17 for additional information regarding uncertain tax positions.information.
The Company records any tax-related interest charges as interest expense and any tax-related penalties as other expense in the consolidated statements of operations.
Stock-based compensation. Stock-based compensation expense is being recognized onfor restricted stock, restricted stock units and performance units and stock option awards that are expected to be settled in the Company's common stock ("Equity Awards") inis measured at the Company's consolidated financial statementsgrant date or modification date, as applicable, using the fair value of the award, and is recorded, net of estimated forfeitures, on a straight line basis over the awards' vesting periods based on their fair values on the dates of grant or modification, as applicable. Stock-based compensation awards generally vest over arequisite service period of three years.the respective award. The amountfair value of stock-based compensation expense recognized at any dateEquity Awards, except performance unit awards, is approximately equal to the ratable portion ofdetermined on the grant date or modification date, as applicable, using the prior day's closing stock price. The fair value of performance unit awards is determined using the award that isMonte Carlo simulation model.
Equity Awards are net settled by withholding shares of the Company's common stock to satisfy income tax withholding payments due upon vesting. Remaining vested at that date.shares are remitted to individual employee brokerage accounts. Shares to be delivered upon vesting of Equity Awards are made available from authorized, but unissued shares or shares held as treasury stock.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


Stock-based compensation liability awards ("Liability Awards") are restrictedRestricted stock awards that are expected to be settled in cash on their vesting dates, rather than in common stock.stock ("Liability Awards"), are included in accounts payable – due to affiliates in the consolidated balance sheets. The fair value of Liability Awards on the grant date is determined using the prior day's closing stock price. The Company recognizes the value of Liability Awards on a straight line basis over the requisite service period of the award. Liability Awards are recorded as accounts payable—affiliates based on themarked to fair value as of each balance sheet date using the vested portion of the awardsclosing stock price on the balance sheet date. TheChanges in the fair valuesvalue of Liability Awards are updated at each balance sheet date and changes in the fair values of the vested portions of the awards are recorded as increases or decreases to stock-based compensation expense.
The Company utilizes (i) the Black-Scholes option pricing model to measure the fair value of stock options, (ii) the prior day's closing stock price on the date of grant to measure the fair value of Equity Awards and Liability Awards (iii) the closing stock price on the balance sheet date to measure the fair value of the vested portions of Liability Awardsparticipate in dividends during vesting periods and (iv) the Monte Carlo simulation method to measure the fair value of performance unit awards.generally vest over three years.
Segments. Operating segments are defined as components of an enterprise that (i) engage in activities from which it may earn revenues and incur expenses (ii) for which separate operational financial information is available and is regularly evaluated by the chief operating decision maker for the purpose of allocating resources and assessing performance.
Based upon how the Company is organized and managed, the Company has only one1 reportable operating segment, which is oil and gas development, exploration and production. The Company considers its vertical integration services

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
and sales of purchased commodities as ancillary to its oil and gas development, exploration and producing activities and manages these services to support such activities. In addition, the Company has a single, company-wide management team that allocates capital resources to maximize profitability and measures financial performance as a single enterprise.
Restructuring. New accounting pronouncements.In February 2016,August 2020, the Company announced plans to restructure its pressure pumping operationsFASB issued ASU 2020-06, "Debt-Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging-Contracts in South Texas, including relocating its two Eagle Ford Shale pressure pumping fleets toEntity's Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity's Own Equity" ("ASU 2020-06"). ASU 2020-06 simplifies the Spraberry/Wolfcamp area. In connection therewith,accounting for certain convertible instruments by removing the Company offered severance to certain employees and relocatedseparation models for convertible debt with a numbercash conversion feature or convertible instruments with a beneficial conversion feature. As a result, more convertible debt instruments will be reported as a single liability instrument with no separate accounting for embedded conversion features. Additionally, this ASU amends the diluted earnings per share calculation for convertible instruments by requiring the use of other employees from its South Texas locations to its operations in the Permian Basin.if-converted method. The initiative was substantially complete as of December 31, 2016. In connection therewith, the Company recognized $4 million of restructuring charges in other expense in the accompanying consolidated statements of operations during the year ended December 31, 2016. The restructuring costs included $3 million in cash employee severance costs and $1 million in employee relocation and other costs.
In May 2015, the Company announced plans to restructure its operations in Colorado, including closing its office in Denver, Colorado and eliminating its Trinidad-based pressure pumping services operations. The restructuring plan was substantially complete as of December 31, 2015. In connection therewith, the Company recognized $23 million of restructuring charges in other expense in the accompanying consolidated statements of operations during the year ended December 31, 2015. The restructuring costs included $17 million in employee severance costs and $6 million in office lease-related costs. The $17 million of employee severance costs for the year ended December 31, 2015 included $16 million related to cash severance payments and $1 million related to accelerated vesting of share-based grants, which were noncash charges.
Lease obligations and other. The $6 million of office lease-related costs for the year ended December 31, 2015 related to certain Denver office space thattreasury stock method will no longer be used, of which $2 million represented the impairment of leasehold improvementsavailable. Entities may adopt this ASU using either a full or modified retrospective approach, and $4 million representedit is effective for interim and annual reporting periods beginning after December 15, 2021. Early adoption is permitted for interim and annual reporting periods beginning after December 15, 2020. This ASU is applicable to the Company's future obligations under0.25% convertible senior notes due 2025.
The Company plans to early adopt ASU 2020-06 on January 1, 2021. Upon issuance of the operating leases, net of anticipated sublease income.
As of December 31, 2017 and 2016,Company's 0.25% convertible senior note due 2025, the Company had $1 millionbifurcated the debt and $2 millionequity components of restructuring liabilities, respectively, primarily relatedthe note to future lease obligations recorded in other currentlong-term debt and noncurrent liabilitiesadditional paid-in capital in the accompanying consolidated balance sheets.
New accounting pronouncements. In March 2016, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2016-09, "Improvements to Employee Share-Based Payment Accounting." ASU 2016-09 simplifies several aspects of the accounting for share-based payment transactions, including accounting for income taxes, forfeitures and statutory tax withholding requirements, as well as certain classification changes in the statement of cash flows. The Company adopted this standard on January 1, 2017. See Note O for discussion on the impact of the adoption to the Company's income tax benefit.
In February 2016, FASB issued ASU 2016-02, "Leases (Topic 842)." ASU 2016-02 requires the recognition of lease assets and lease liabilities by lessees for those leases currently classified as operating leases and makes certain changes to the accounting for lease expenses. This update is effective for fiscal years beginning after December 15, 2018 and for interim periods beginning the following year. This update should be applied using a modified retrospective approach, and early adoption is permitted. The Company anticipates that thesheets respectively. Upon adoption of ASU 2016-02 2020-06, the Company expects to reclassify the unamortized discount and fees on the convertible senior notes of $202 million from additional paid-in capital to long-term debt, which is expected to result in a reduction in the interest expense recognized over the remaining term of the convertible senior notes. See Note 7 for its leasing arrangements will likely (i) increaseadditional information.
NOTE 3. Acquisitions, Divestitures, Decommissioning and Restructuring Activities
Acquisitions. During 2020, 2019 and 2018, the Company spent a total of $14 million, $28 million and $65 million, respectively, to acquire primarily undeveloped acreage for future exploitation and exploration activities in the Spraberry/Wolfcamp field of the Permian Basin.
Divestitures. The Company's significant divestitures to unaffiliated third parties (except for the sale of the Company's pressure pumping assets that were sold to a related party) are as follows:
In May 2020, the Company completed the sale of certain vertical wells and approximately 1,500 undeveloped acres in Upton County of the Permian Basin for net cash proceeds of $6 million. The Company recorded a gain of $6 million associated with the sale.
In December 2019, the Company completed the sale of certain vertical and horizontal wells and approximately 4,500 undeveloped acres in Glasscock County of the Permian Basin for net cash proceeds of $64 million. The Company recorded a gain of $10 million associated with the sale.
In July 2019, the Company completed the sale of certain vertical wells and approximately 1,400 undeveloped acres in Martin County of the Permian Basin to for net cash proceeds of $27 million. The Company recorded a gain of $26 million associated with the sale.
In June 2019, the Company completed the sale of certain vertical wells and approximately 1,900 undeveloped acres in Martin County of the Permian Basin to for net cash proceeds of $38 million. The Company recorded a gain of $31 million associated with the sale.
In May 2019, the Company completed the sale of its Eagle Ford assets and liabilities,other remaining assets in South Texas (the "South Texas Divestiture") in exchange for total consideration having an estimated fair value of $210 million. The fair value of the consideration included (i) net cash proceeds of $2 million, (ii) increase depreciation, depletion$136 million in contingent consideration and amortization expense, (iii) increase interest expensea $72 million receivable associated with estimated deficiency fees to be paid by the buyer. The Company recorded a loss of $525 million associated with the sale.
Contingent Consideration. Per the terms of the South Texas Divestiture, the Company was entitled to receive contingent consideration based on future annual oil and (iv) decrease

NGL prices during each of the five years from 2020 to 2024. The Company revalued the contingent consideration using an option pricing model each reporting period prior to the settlement of the contingent consideration in July 2020, at which time, the Company received cash proceeds of

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

lease/rental expense.$49 million from the buyer to fully satisfy the contingent consideration. The Company is currently evaluating eachrecorded a noncash loss of its lease arrangements$42 million to interest and has not determinedother income during the aggregate amount of change expectedyear ended December 31, 2020 associated with the settlement. See Note 4, Note 5and Note 15 for each category. In January 2018, the FASB issued ASU 2018-01, which permits an entity to elect an optional transition practical expedient to not evaluate land easements that exist or expire before the Company's adoption of Topic 842 and that were not previously accounted for as leases under Topic 840. additional information.
Deficiency Fee Obligation. The Company intendstransferred its long-term midstream agreements and associated minimum volume commitments ("MVC") to elect this transition provision.
In May 2014, the FASB issued ASU 2014-09, "Revenuebuyer. However, the Company retained the obligation to pay 100 percent of any deficiency fees associated with the MVC from Contracts with Customers (Topic 606)," which supersedesJanuary 2019 through July 2022. The Company determines the revenue recognition requirementsfair value of the deficiency fee obligation using a probability weighted discounted cash flow model. The deficiency fee obligation is included in Accounting Standards Codification ("ASC") Topic 605, "Revenue Recognition," and most industry-specific guidance. ASU 2014-09 iscurrent or noncurrent liabilities in the consolidated balance sheets, based on the principle that revenueestimated timing of payments. During the year ended December 31, 2020, the Company recorded a charge of $84 million in other expense in the consolidated statements of operations, to increase the Company's forecasted deficiency fee payments as a result of a reduction in planned drilling activities by the buyer. The estimated remaining deficiency fee obligation was $333 million as of December 31, 2020. See Note 4 and Note 16for additional information.
Deficiency Fee Receivable. The buyer is recognizedrequired to depictreimburse the transferCompany for 18 percent of goods or servicesthe deficiency fees paid under the transferred midstream agreements from January 2019 through July 2022. Such reimbursement will be paid by the buyer in installments beginning in 2023 through 2025. The Company determines the fair value of the deficiency fee receivable using a credit risk-adjusted valuation model. During the year ended December 31, 2020, the Company recorded an increase to customersthe Company's long-term deficiency fee receivable of $4 million in other expense in the consolidated statements of operations, to reflect the buyer's share of 2020 deficiency fees which were greater than originally forecasted as of the date of the sale. The deficiency fee receivable is included in noncurrent other assets in the consolidated balance sheets. See Note 4 and Note 11 for additional information.
Restricted Cash. As a condition of the sale, the Company deposited $75 million into an amount that reflects the consideration to which the entity expectsescrow account to be entitledused to fund future MVC payments. Beginning in 2021, the required escrow balance will decline to $50 million. To the extent that there is any remaining balance after the payment of deficiency fees, the balance will become unrestricted and revert to the Company on March 31, 2023. The escrow account balance is included in restricted cash in the consolidated balance sheets.
In December 2018, the Company completed the sale of its pressure pumping assets to ProPetro in exchange for those goods or services. ASU 2014-09 also requires additional disclosure abouttotal consideration of $282 million, comprised of 16.6 million shares of ProPetro's common stock, which was delivered as of the nature, amount, timing and uncertainty of revenue and cash flows arising from customer contracts. In August 2015, the FASB issued ASU 2015-14, which defers the effective date of ASU 2014-09 for one year to annual reports beginning after December 15, 2017. Early adoption is permitted for fiscal years beginning after December 15, 2016. In addition,the sale with a fair value of $172 million, and $110 million in May 2016,cash, which was received during the FASB issued ASU 2016-11, which rescinds guidance fromfirst quarter of 2019. During 2018, the SEC on accounting for gas balancing arrangementsCompany recorded a gain of $30 million, employee-related charges of $19 million, contract termination charges of $13 million and will eliminate the useother divestiture-related charges of the entitlements method.
During the Company's implementation of Topic 606, it identified the following revenue streams: oil, NGL and gas sales and sales of purchased oil and gas. The Company's analysis of contracts with customers in accordance$6 million associated with the requirements of Topic 606 is complete. The Company has not identified any changes to the timing of revenue recognition based upon the requirements of Topic 606 that would have a material impact on the Company's consolidated financial statements. The Company will utilize the modified approach to adopt the new standards on their January 1, 2018 effective date. The Company continues to review its implementation documentation and its evaluation of the new disclosure requirements is ongoing.
NOTE C. Acquisitions and Divestitures
Acquisitions
Permian Basin. In August 2016,sale. During 2019, the Company acquiredreduced the gain associated with the sale by $10 million and recorded additional employee-related charges of $1 million. See Note 12 for additional information.
In December 2018, the Company completed the sale of approximately 28,0002,900 net acres in the PermianSinor Nest (Lower Wilcox) oil field in South Texas for net cash proceeds of $105 million. The Company recorded a gain of $54 million associated with the sale.
In August 2018, the Company completed the sale of its assets in the West Panhandle gas and liquids field for net cash proceeds of $170 million. The Company recorded a gain of $127 million and employee-related charges of $7 million associated with the sale.
In July 2018, the Company completed the sale of its gas field assets in the Raton Basin (the "Raton Basin Sale") for net cash proceeds of $54 million. The Company recorded a noncash impairment charge of $77 million in June 2018 to reduce the carrying value of its Raton Basin assets to their estimated fair value less costs to sell as the assets were considered held for sale. The Company recorded a gain of $2 million, other divestiture-related charges of $117 million, including $111 million of deficiency charges related to certain firm transportation contracts retained by the Company, and employee-related charges of $6 million associated with net productionthe sale.
In April 2018, the Company completed the sale of approximately 1,400 barrels10,200 net acres in the West Eagle Ford Shale gas and liquids field for net cash proceeds of oil equivalent per day ("BOEPD"), from an unaffiliated third party for $428$100 million. The acquisition was accounted for usingCompany recorded a gain of $75 million associated with the acquisition method under ASC 805, "Business Combinations," which requires acquired assets and liabilities to be recorded at fair value as of the acquisition date.
The following table represents the allocation of the acquisition price to the assets acquired and the liabilities assumed based on their fair value at the acquisition date (in millions):sale.

Assets acquired:  
Proved properties $79
Unproved properties 347
Other property and equipment 5
Liabilities assumed:  
Asset retirement obligations (2)
Other liabilities (1)
Net assets acquired $428
83
The fair value measurements of the net assets acquired are based on inputs that are not observable in the market and, therefore, represent Level 3 inputs in the fair value hierarchy (see Note D for a description of the input levels in the fair value hierarchy). The Company calculated the fair values of the acquired proved properties and asset retirement obligations using a discounted future cash flow model that utilizes management's estimates of (i) proved reserves, (ii) forecasted production rates, (iii) future operating, development and plugging and abandonment costs, (iv) future commodity prices and (v) a discount rate of 10 percent for proved properties and seven percent for asset retirement obligations. The Company calculated the fair values of the acquired unproved properties based on the average price per acre in comparable market transactions. The operating results attributable to the acquired assets and liabilities assumed are included in the Company's accompanying consolidated statements of operations since the date of acquisition.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

In connection with the acquisition, the Company incurred acquisition related costs (primarily consulting, advisory and legal fees) of $1 million. The operating results included in the Company's accompanying consolidated statements of operations from the date of acquisition to December 31, 2016, and the operating results that would have been recognized had the acquisition occurred on January 1, 2016, are not material to the Company's accompanying consolidated statements of operations.
Divestitures Recorded in Continuing Operations
The Company recorded net gains on the disposition of assets in continuing operations of $208 million, $2 million and $782 million during the years ended December 31, 2017, 2016 and 2015, respectively. The following describes the significant divestitures included in continuing operations:
In April 2017, the Company completed the sale of approximately 20,500 acres in the Martin County region of the Permian Basin, with net production of approximately1,500 BOEPD, to an unaffiliated third party for cash proceeds of $264 million. The sale resulted in a gain of $194 million. In conjunction with the divestiture, the Company reduced the carrying value of goodwill by $2 million, reflecting the portion of the Company's goodwill related to the assets sold.
EFS Midstream. In July 2015, the Company completed the sale of its 50.1 percent interest in EFS Midstream LLC ("EFS Midstream"), which was accounted for under the equity method of accounting, to an unaffiliated third party, with the Company receiving total consideration of $1.0 billion, of which $530 million was received at closing, and the remaining $501 million was received in July 2016. Associated with the sale, the Company recorded a gain of $777 million during 2015.
Other. During 2017, 2016 and 2015, the Company sold other proved and unproved properties, inventory and other property and equipment and recorded net gains of $14 million, $2$3 million and $1 million during 2020 and 2018, respectively, and a net loss of $9 million during 2019.
Decommissioning. In November 2018, the Company announced plans to close its sand mine located in Brady, Texas and transition its proppant supply requirements to West Texas sand sources.
During 2019, the Company recorded $23 million of accelerated depreciation, $13 million of inventory and other property and equipment impairment charges and $12 million of sand mine closure-related costs.
During 2018, the Company recorded $443 million of accelerated depreciation and $7 million of employee-related charges associated with the closure.
Restructuring. During the third quarter of 2020, the Company announced a corporate restructuring to reduce its staffing levels to correspond with a planned reduction in future activity levels (the "2020 Corporate Restructuring"). The restructuring resulted in approximately 300 employees being involuntarily separated from the Company in October 2020. The Company recorded $78 million of employee-related charges, including $5 million respectively. The net gain of $14 million for 2017 is primarilynoncash stock-based compensation expense related to the saleaccelerated vesting of nonstrategic proved and unproved propertiescertain equity awards, in other expense in the Permian Basinconsolidated statements of operations during the year ended December 31, 2020. See Note 8 and Note 16 for cash proceeds of $77 million.
additional information.
Divestitures Recorded in Discontinued Operations
In 2015,June 2020, the Company recognized losses from discontinuedimplemented changes to its well services business, including a staffing reduction of approximately 50 employees. The changes were made to more closely align the well services cost structure and headcount with the Company's reduction in expected activity levels (the "2020 Well Services Restructuring"). The Company recorded $1 million of employee-related charges in other expense in the consolidated statements of operations net of tax, of $7 millionduring the year ended December 31, 2020 related to pluggingthe staffing reductions in its well services business. See Note 16 for additional information.
During 2019, the Company implemented a corporate restructuring program to align its cost structure with the needs of a Permian Basin-focused company (the "2019 Corporate Restructuring Program"). The restructuring occurred in three phases as follows:
In March 2019, the Company made certain changes to its leadership and abandonmentorganizational structure, which included the early retirement and departure of certain officers of the Company.
In April 2019, the Company adopted a voluntary separation program ("VSP") for certain eligible employees, and
In May 2019, the Company implemented an involuntary separation program ("ISP").
During 2019, the Company recorded $159 million of employee-related charges, including $26 million of noncash stock-based compensation expense related to the accelerated vesting of certain equity awards, associated with the 2019 Corporate Restructuring Program. See Note 8 and Note 16 for additional information.
Employee-related costs are primarily recorded in other expense in the consolidated statements of operations. Obligations associated with employee-related charges are included in accounts payable - due to affiliates in the consolidated balance sheets.
The changes in the Company's employee-related obligations associated with two Gulfits restructuring programs and asset divestitures are as follows:
Year Ended December 31,
20202019
(in millions)
Beginning employee-related obligations$$27 
Additions (a)79 181 
Less:
Noncash stock-based compensation26 
Cash payments78 176 
Ending employee-related obligations$$
____________________
(a)Additions are comprised of:


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Table of Mexico wells that Pioneer divested in 2009. The results of operationsContents
PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
Year Ended December 31,
20202019
(in millions)
2020 Corporate Restructuring$78 $
2020 Well Services Restructuring
2019 Corporate Restructuring Program159 
Other divestiture and decommissioning charges22 
$79 $181 
See Note 16 for these assets were recorded in discontinued operations upon their divestiture and therefore the costs incurred subsequent to their divestiture are reflected as discontinued operations in the accompanying consolidated statements of operations.additional information.
NOTE D.4. Fair Value Measurements
FairThe Company determines fair value is defined asbased on the price that would be received to sellfrom selling an asset or the price paid to transfer a liability in an orderly transaction between market participants at the measurement date. Fair value measurements are based upon inputs that market participants use in pricing an asset or liability, which are characterized according to a hierarchy that prioritizes those inputs based on the degree to which they are observable. 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. 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 three input levels of the fair value hierarchy are as follows:
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, typically reflecting management's estimate of assumptions that market participants would use in pricing the asset or liability. The fair values are therefore determined using model-based techniques, including discounted cash flow models.
Assets and liabilities measured at fair value on a recurring basis. The Assets and liabilities measured at 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.a recurring basis are as follows:

As of December 31, 2020
 Fair Value Measurements
 Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
 (in millions)
Assets:
Commodity derivatives$$$$
Deferred compensation plan assets72 72 
Investment in affiliate123 123 
Total assets195 203 
Liabilities:
Commodity derivatives209 209 
Marketing derivatives91 91 
209 91 300 
Total recurring fair value measurements$195 $(201)$(91)$(97)

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

As of December 31, 2019
 Fair Value Measurements
 Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Total
 (in millions)
Assets:
Commodity derivatives$$32 $$32 
Marketing derivatives21 21 
Deferred compensation plan assets85 85 
Investment in affiliate187 187 
Contingent consideration91 91 
Total assets272 123 21 416 
Liabilities:
Commodity derivatives20 20 
Total recurring fair value measurements$272 $103 $21 $396 
The following tables present the Company's assets and liabilities that are measured at fair value on a recurring basis as of December 31, 2017 and 2016 for each of the fair value hierarchy levels:
 Fair Value Measurements at December 31, 2017 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 December 31, 2017
 (in millions)
Assets:       
Commodity derivatives$
 $11
 $
 $11
Deferred compensation plan assets95
 
 
 95
Total assets95
 11
 
 106
Liabilities:       
Commodity derivatives
 255
 
 255
Total liabilities
 255
 
 255
Total recurring fair value measurements$95
 $(244) $
 $(149)
 Fair Value Measurements at December 31, 2016 Using  
 Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
 Significant Other
Observable
Inputs
(Level 2)
 Significant
Unobservable
Inputs
(Level 3)
 Fair Value at December 31, 2016
 (in millions)
Assets:       
Commodity derivatives$
 $8
 $
 $8
Interest rate derivatives
 6
 
 6
Deferred compensation plan assets83
 
 
 83
Total assets83
 14
 
 97
Liabilities:       
Commodity derivatives
 84
 
 84
Total liabilities
 84
 
 84
Total recurring fair value measurements$83
 $(70) $
 $13
Commodity price derivatives. The Company's commodity derivatives primarily represent oil, NGL and gas swap contracts, collar contracts, and collar contracts with short puts.puts and basis swap contracts. The asset and liability measurements for the Company's commodity derivative contracts representedare determined using Level 2 inputs in the hierarchy.inputs. The Company utilizes discounted cash flow and option-pricing models for valuing its commodity price derivatives.
The asset and liability values attributable to the Company's commodity price derivatives were determined based on inputs that include (i) the contracted notional volumes, (ii) independent active market price quotes, (iii) the applicable estimated credit-adjusted risk-free rate yield curve and (iv) the implied rate of volatility inherent in the collar contracts and collar contracts with short puts, which is based on active and independent market-quoted volatility factors.
Marketing derivatives. The Company's marketing derivatives reflect two long-term marketing contracts that were entered in October 2019. Under the contract terms, beginning on January 1, 2021, the Company agreed to purchase and simultaneously sell 50 thousand barrels of oil per day at an oil terminal in Midland, Texas for a six-year term that ends on December 31, 2026. The price the Company pays to purchase the oil volumes under the purchase contract is based on a Midland WTI price and the price the Company receives for the oil volumes sold is a weighted average sales price ("WASP") that the non-affiliated counterparty receives for selling oil through their Gulf Coast storage and export facility at prices that are highly correlated with Brent oil prices during the same month of the purchase. Based on the form of the marketing contracts, the Company determined that the marketing contracts should be accounted for as derivative instruments not designated as hedges. The asset and liability measurements for the Company's marketing derivative contracts are determined using both Level 2 and 3 inputs. The Company utilizes a discounted cash flow model for valuing its marketing derivatives.
The asset and liability values attributable to the Company's marketing derivative were determined based on Level 2 inputs that include (i) the contracted notional volumes, (ii) independent active market price quotes, (iii) the applicable estimated credit-adjusted risk-free rate yield curve and (iv) stated contractual rates. The Level 3 inputs attributable to the Company's marketing derivatives include the historical monthly differential between Brent oil prices and the corresponding WASP of the counterparty to the marketing derivatives ("WASP Differential Deduction") and, to a lesser extent, an estimated annual cost inflation rate. The average WASP Differential Deduction used in the fair value determination as of December 31, 2020 and 2019 was $1.91 per barrel and $1.72 per barrel, respectively. The WASP Differential Deduction and the estimated annual cost inflation rate reflects management's best estimate of future results utilizing historical performance (excluding April 2020 and May 2020 for the average WASP Differential Deduction that were anomalously impacted by COVID-19), but these estimates are not observable inputs by a market participant and contain a high degree of uncertainty. The Company could experience significant mark-to-market fluctuations in the fair value of its marketing derivatives based on changes in the WASP Differential Deduction if it deviates from historical levels. For example, a 10 percent increase or decrease in the WASP Differential Deduction would impact the fair value of the Company's marketing derivatives recorded by approximately $20 million as of December 31, 2020.

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
Deferred compensation plan assets. The Company's deferred compensation plan assets representinclude investments in equity and mutual fund securities that are actively traded on major exchanges. TheseThe fair value of these investments are measuredis determined using Level 1 inputs based on observable prices on major exchanges. As
Investment in affiliate. The Company elected the fair value option for measuring its equity method investment in ProPetro. The fair value of its investment in ProPetro is determined using Level 1 inputs based on observable prices on a major exchange. See Note 12 and Note 15 for additional information.
Contingent consideration. Per the terms of the South Texas Divestiture, the Company was entitled to receive contingent consideration based on future annual oil and NGL prices during each of the five years from 2020 to 2024. The Company revalued the contingent consideration using an option pricing model each reporting period prior to the settlement of the contingent consideration in July 2020, at which time, the Company received cash proceeds of $49 million from the buyer to fully satisfy the contingent consideration. The Company recorded a noncash loss of $42 million to interest and other income during the year ended December 31, 20172020 associated with the settlement. During 2019, the Company recorded a noncash loss of $45 million to interest and 2016,other income associated with adjusting the significantcontingent consideration to fair value. The fair value of the contingent consideration was determined using Level 2 inputs to these asset exchange values represented Level 1 independentbased on an option pricing model using quoted future commodity prices from active exchange market price inputs.markets, implied volatility factors and counterparty credit risk assessments. See Note 3 and Note 5 and Note 15 for additional information.
Assets and liabilities measured at fair value on a nonrecurring basis. Certain assets and liabilities are measured at fair value on a nonrecurring basis. These assets and liabilities are not measured at fair value on an ongoing basis butand are subject to fair value adjustments in certain circumstances. These assets and liabilities can include inventory, proved and unproved oil and

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


gas properties and other long-lived assets that are written down to fair value when they are impaired or held for sale. See Note C for information on the fair value of assets and liabilities acquired in the Permian Basin acquisition.
Inventories. During the years ended December 31, 2017, 2016 and 2015,Convertible Notes. In May 2020, the Company recognized noncash impairment chargesissued $1.3 billion principal amount of $2 million, $8 million and $71 million, respectively, primarily to reduce the carrying value of its excess pipe inventory.0.25% convertible senior notes due 2025 ("Convertible Notes"). The Company calculatedbifurcated the Convertible Notes into debt and equity components at issuance. The value assigned to the debt component of $1.1 billion was the estimated fair value, as of the issuance date, of an equivalent senior note without the conversion feature. The difference between the cash proceeds and the estimated fair value, representing the value assigned to the equity component of $234 million was recorded as a debt discount. Through December 31, 2020, the Company had amortized $28 million of the initially recorded debt discount to interest expense. The Company measured the debt component at fair value by utilizing a discounted cash flow model. This model utilized observable inputs such as the contractual interest rate and repayment terms, the risk-free interest rate, benchmark forward yield curves and the average term-yield on the Company's existing non-convertible debt. See Note 7 for additional information.
Other assets. During the year ended December 31, 2019, the Company impaired the remaining $13 million of inventory and other property and equipment related to the decommissioning of the Company's Brady, Texas sand mine, as these assets had no remaining future economic value. In addition, the Company recognized a $16 million impairment charge related to pressure pumping assets that had no future benefit to the Company. See Note 16 for additional information.
South Texas Divestiture. During May 2019, the Company recorded the MVC obligation and related deficiency fee receivable in conjunction with the South Texas Divestiture. The fair value of the deficiency fee obligation and deficiency fee receivable was determined using significant Level 2 assumptions3 inputs based on third-party price quotes fora probability-weighted forecast that considers historical results, market conditions and various development plans to arrive at the assetestimated present value of the deficiency payments and corresponding receipts. Changes to the Company's forecasted deficiency fee obligation, as a result of the expected impact of the COVID-19 pandemic on the buyer's ability to drill economic wells, resulted in an active market. The impairment charges are included inthe Company recording a charge of $84 million to other expense in the Company's accompanying consolidated statements of operations.
Proved oil and gas properties. As a result of the Company's proved property impairment assessments, the Company recognized noncash impairment charges to reduce the carrying values of (i) the Raton fieldoperations during the year ended December 31, 2017, (ii) the West Panhandle field during the year ended December 31, 2016 and (iii) the Eagle Ford Shale field, the South Texas - Other field and the West Panhandle field during the year ended December 31, 2015.
The Company calculated the fair values of the Raton field, the West Panhandle field, the Eagle Ford Shale field and the South Texas - Other field proved properties using a discounted cash flow model. Significant Level 3 assumptions associated with the calculation of discounted future cash flows included management's longer-term commodity price outlooks ("Management's Price Outlooks") and management's outlooks for (i) production, (ii) capital expenditures, (iii) production costs and (iv) estimated proved reserves and risk-adjusted probable reserves. Management's Price Outlooks are developed based on third-party longer-term commodity futures price outlooks as of each measurement date. The expected future net cash flows were discounted using an annual rate of 10 percent to determine fair value.
The following table presents the fair value and fair value adjustments (in millions) for the 2017, 2016 and 2015 proved property impairments, as well as the average oil price per barrel ("Bbl") and gas price per British thermal unit ("MMBtu") utilized in the respective Management's Price Outlooks:
    
Fair
Value
 
Fair Value
Adjustment
 Management's Price Outlooks
    
 Oil Gas
Raton March 2017 $186
 $(285) $53.65
 $3.00
West Panhandle March 2016 $33
 $(32) $49.77
 $3.24
South Texas - Eagle Ford Shale December 2015 $483
 $(846) $52.82
 $3.34
South Texas - Other September 2015 $88
 $(72) $57.41
 $3.46
West Panhandle March 2015 $61
 $(138) $65.02
 $3.83
It is reasonably possible that the Company's estimate of undiscounted future net cash flows attributable to these or other properties may change in the future resulting in the need to impair their carrying values. The primary factors that may affect estimates of future cash flows are (i) future adjustments, both positive and negative, to proved and risk-adjusted probable and possible oil and gas reserves, (ii) results of future drilling activities, (iii) Management's Price Outlooks and (iv) increases or decreases in production and capital costs associated with these reserves.
Unproved oil and gas properties. During March 2016,2020. In addition, the Company recorded an impairment chargeincrease to the deficiency fee receivable of $32$4 million to write-off the carrying value of its unproved royalty acreage in Alaska as a result of the operator curtailing operationsother expense in the area and Management's Price Outlooks. During 2015, the Company recorded impairment charges of $7 million to impair the remaining carrying value of its unproved properties in southeast Colorado as a result of the Company no longer planning to develop this acreage and the acreage's limited market value, if any, given the short time period until the leases expire. The Company's impairment charges for unproved oil and gas properties are reported in exploration and abandonments in the accompanying consolidated statements of operations.operations to reflect an increase to the buyer's share of 2020 deficiency fees. The Company will not increase the estimated deficiency fee receivable associated with 2021 and 2022 forecasted deficiencies until they are realizable. The present value of the future cash payments and expected cash receipts were determined using a 3.6 percent and 3.2 percent discount rate, respectively, based on the estimated timing of future payments and receipts and the Company's counterparty credit risk assessments. See Note 3, Note 11 and Note 16 for additional information.

Sale of Raton Basin assets. In June 2018, the Company completed the Raton Basin Sale and recorded deficiency fee obligations related to certain firm transportation contracts retained by the Company of $111 million to other expense in the consolidated statements of operations. The fair value of these contracts was determined using Level 2 inputs, including an
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

annual discount rate of 4.4 percent, to discount the expected future cash flows. See Note 3, Note 11 and Note 16 for additional information.
Proved oil and gas properties. The Company performs assessments of its proved oil and gas properties, which are accounted for under the successful efforts method of accounting, whenever events or circumstances indicate that the carrying value of those assets may not be recoverable. An impairment loss is indicated if the sum of the expected future cash flows, including cash flows from vertically integrated services that are used in the development of the assets, is less than the carrying amount of the assets, including the carrying value of the vertically integrated services. In these circumstances, the Company recognizes an impairment charge for the amount by which the carrying amount of the assets exceeds the estimated fair value of the assets.
Based on management's commodity price outlooks as of December 31, 2020, which represent longer-term commodity price outlooks that are developed based on third party future commodity price estimates as of a measurement date ("Management's Price Outlooks"), the Company determined events and circumstances did not indicate that the carrying value of the Company's proved properties were not recoverable.
Goodwill. Goodwill is assessed for impairment whenever it is more likely than not that events or circumstances indicate the carrying value of a reporting unit exceeds its fair value, but no less often than annually. An impairment charge is recorded for the amount by which the carrying amount exceeds the fair value of a reporting unit in the period it is determined to be impaired.
Based on the Company's annual assessment of the fair value of goodwill as of July 1, 2020, the Company determined that its goodwill was not impaired. As of December 31, 2020, there were no material changes in events or circumstances that would warrant a reassessment for impairment.
There is significant uncertainty surrounding the long-term impact to global oil demand due to the effects of the COVID-19 pandemic. These conditions negatively impacted the Company's 2020 capital activities and production levels and could negatively impact the Company's 2021 forecasted capital activities and production levels. It is reasonably possible that the carrying value of the Company's proved oil and gas properties or goodwill could exceed their estimated fair value potentially resulting in the need to impair their carrying values in the future. If incurred, an impairment of the Company's proved oil and gas properties or goodwill could have a material adverse effect on the Company's results of operation.
Financial instruments not carried at fair value. Carrying values and fair values of financial instruments that are not carried at fair value in the accompanying consolidated balance sheets as of December 31, 2017 and 2016 are as follows:
 As of December 31, 2020As of December 31, 2019
Carrying
Value
Fair
Value
Carrying
Value
Fair
Value
 (in millions)
Assets:
Cash and cash equivalents (a)$1,442 $1,442 $631 $631 
Restricted cash (a)$59 $59 $74 $74 
Liabilities:
Current portion of long-term debt:
Senior notes (b)$140 $140 $450 $451 
Long-term debt:
Convertible senior notes (b)$1,100 $1,756 $$
Senior notes (b)$2,060 $2,230 $1,839 $1,995 
  December 31, 2017 December 31, 2016
  
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
  (in millions)
Commercial paper, corporate bonds and time deposits $1,284
 $1,282
 $1,906
 $1,901
Current portion of long-term debt $449
 $457
 $485
 $490
Long-term debt $2,283
 $2,479
 $2,728
 $2,956
______________________
Commercial paper, corporate bonds and time deposits. Periodically,(a)Fair value approximates carrying value due to the Company invests in commercial paper and corporate bonds with investment grade rated entities. The Company also periodically enters into time deposits with financial institutions. The investments are carried at amortized cost and classified as held-to-maturity as the Company has the intent and ability to hold them until they mature. The carrying values of held-to-maturity investments are adjusted for amortization of premiums and accretion of discounts over the remaining lifeshort-term nature of the investment. Income related to these investments is recorded in interest and other income in the Company's consolidated statement of operations. The Company's investments in corporate bonds represent Level 1 inputs in the hierarchy, while other investments represent Level 2 inputs in the hierarchy. Commercial paper and time deposits are included in cash and cash equivalents if they have maturity dates that are less than 90 days at the date of purchase; otherwise, investments are reflected in short-term investments or long-term investments in the accompanying consolidated balance sheets based on their maturity dates. The following tables provide the components of the Company's cash and cash equivalents and investments as of December 31, 2017 and 2016:instruments.
 December 31, 2017
Consolidated Balance Sheet LocationCash Commercial Paper Corporate Bonds Time
Deposits
 Total
 (in millions)
Cash and cash equivalents$846
 $
 $
 $50
 $896
Short-term investments
 124
 647
 447
 1,218
Long-term investments
 
 66
 
 66
 $846
 $124
 $713
 $497
 $2,180
 December 31, 2016
Consolidated Balance Sheet LocationCash Commercial Paper Corporate Bonds Time
Deposits
 Total
 (in millions)
Cash and cash equivalents$873
 $45
 $
 $200
 $1,118
Short-term investments
 368
 691
 382
 1,441
Long-term investments
 
 420
 
 420
 $873
 $413
 $1,111
 $582
 $2,979
Debt obligations. The Company's debt obligations are composed of its senior notes whose fair(b)Fair value is determined utilizing inputs that areusing Level 2 measurements in the fair value hierarchy.inputs. The Company's senior notes represent debt securities that are quoted, but not actively traded on major exchanges; therefore, fair values of the Company's senior notes arevalue is based on their periodic values as quoted on the major exchanges. The carrying value of convertible senior notes does not include $206 million of unamortized debt discount. See Note 7 for additional information.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
The Company has other financial instruments consisting primarily of receivables, payables and other current assets and liabilities that approximate fair value due to the nature of the instrument and their relatively short maturities. Non-financial assets and liabilities initially measured at fair value include assets acquired and liabilities assumed in a business combination, goodwill and asset retirement obligations.
Concentrations of credit risk. As of December 31, 2017, the Company's primary concentration of credit risks are the risks associated with collecting receivables (principally accounts receivables) and the risk of a counterparty's failure to perform under derivative contracts owed to the Company. See Note L for information regarding the Company's major customers.

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


With respect to accounts receivables, the Company uses credit and other financial criteria to evaluate the credit standing of the entity obligated to make the payment, and where appropriate, the Company obtains assurances of payment, such as a guarantee by the parent company of the entity or such other credit support as the Company believes is appropriate.
The Company has entered into International Swap Dealers Association Master Agreements ("ISDA Agreements") with each of its derivative counterparties. The terms of the ISDA Agreements provide the Company and the counterparties with rights of set off upon the occurrence of defined acts of default by either the Company or a counterparty to a derivative, whereby the party not in default may set off all derivative liabilities owed to the defaulting party against all derivative asset receivables from the defaulting party. See Note E for additional information regarding the Company's derivative activities and information regarding derivative net assets and liabilities by counterparty.
NOTE E.5. Derivative Financial Instruments
The Company primarily utilizes commodity swap contracts, collar contracts, and collar contracts with short puts and basis swap contracts to (i) reduce the effect of price volatility on the commodities the Company produces and sells or consumes, (ii) support the Company's annual capital budgeting and expenditure plans and (iii) reduce commodity price risk associated with certain capital projects. support the payment of contractual obligations and dividends.
Oil production derivatives.The Company also, from time to time, utilizes interest rate contracts to reducesells its oil production at the effect of interest rate volatility onlease and the Company's indebtedness.
Periodically, the Company may pay a premium to enter into commodity contracts. Premiums paid, if any, have been nominal in relation to the value of the underlying asset in the contract. The Company recognizes the nominal premium payments as an increase to the value of the derivative assets when paid. All derivatives are adjusted to fair value as of each balance sheet date.
Oil production derivative activities.All material physical sales contracts governing the Company'ssuch oil production are tied directly to, or are highly correlated with, New York Mercantile Exchange ("NYMEX") WTIWest Texas Intermediate ("WTI") oil prices. The Company usesalso enters into pipeline capacity commitments in order to secure available oil, NGL and gas transportation capacity from the Company's areas of production. The Company also enters into purchase transactions with third parties and separate sale transactions with third parties to diversify a portion of the Company's oil sales to Gulf Coast refineries or international export markets at prices that are highly correlated with Brent oil prices. As a result, the Company will generally use Brent derivative contracts to manage future oil price volatility and basis swap contracts to reduce basis risk between NYMEX prices and actual index prices at which the oil is sold.volatility.
The following table sets forth the volumesVolumes per day associated with the Company's outstanding oil derivative contracts as of December 31, 20172020 and the weighted average oil prices for those contracts:contracts are as follows:
2021Year Ending December 31, 2022
First
Quarter
Second QuarterThird QuarterFourth Quarter
Brent swap contracts:
Volume per day (Bbl)85,000 85,000 
Price per Bbl$46.88 $46.88 $$$
Brent collar contracts with short puts:
Volume per day (Bbl)90,000 90,000 90,000 90,000 20,000 
Price per Bbl:
Ceiling$50.74 $50.74 $50.74 $50.74 $57.88 
Floor$45.11 $45.11 $45.11 $45.11 $45.50 
Short put$35.07 $35.07 $35.07 $35.07 $35.00 
Brent call contracts sold:
Volume per day (Bbl) (a)20,000 20,000 20,000 20,000 
Price per Bbl:$69.74 $69.74 $69.74 $69.74 $
 2018 Year Ending December 31, 2019
 
First
Quarter
 Second Quarter Third Quarter Fourth Quarter 
Collar contracts:         
Volume (Bbl)3,000
 3,000
 3,000
 3,000
 
Average price per Bbl:         
Ceiling$58.05
 $58.05
 $58.05
 $58.05
 $
Floor$45.00
 $45.00
 $45.00
 $45.00
 $
Collar contracts with short puts (a):         
Volume (Bbl)149,000
 149,000
 154,000
 159,000
 40,000
Price per Bbl:         
Ceiling$57.79
 $57.79
 $57.70
 $57.62
 $59.62
Floor$47.42
 $47.42
 $47.34
 $47.26
 $52.00
Short put$37.38
 $37.38
 $37.31
 $37.23
 $42.00
______________________
____________________(a)The referenced call contracts were sold in exchange for higher ceiling prices on certain 2020 collar contracts with short puts.
(a)Subsequent to December 31, 2017, the Company entered into additional oil collar contracts with short puts for 25,000 Bbl per day of 2019 production with a ceiling price of $62.55 per Bbl, a floor price of $53.80 per Bbl and a short put price of $43.80 per Bbl.
NGL production derivative activities.derivatives. All material physical sales contracts governing the Company's NGL production are tied directly or indirectly to either Mont Belvieu, Texas or Conway, Kansas NGL component product prices. The Company uses derivative contracts to manage the NGL component product price volatility.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


The following table sets forth2020, the volumes per day associated with the Company's outstandingCompany did not have any NGL derivative contracts as of December 31, 2017 and the weighted average NGL prices for those contracts:outstanding.
 2018 Year Ending December 31, 2019
 First
Quarter
 Second Quarter Third Quarter Fourth Quarter 
Ethane basis swap contracts (a):         
Volume (MMBtu)6,920
 6,920
 6,920
 6,920
 6,920
Price differential ($/MMBtu)$1.60
 $1.60
 $1.60
 $1.60
 $1.60
____________________
(a)The ethane basis swap contracts reduce the price volatility of ethane forecasted for sale by the Company at Mont Belvieu, Texas-posted prices. The ethane basis swap contracts fix the basis differential on a NYMEX Henry Hub ("HH") MMBtu equivalent basis. The Company will receive the HH price plus the price differential on 6,920 MMBtu per day, which is equivalent to 2,500 Bbls per day of ethane.
Gas production derivative activities.derivatives. All material physical sales contracts governing the Company's gas production are tied directly or indirectly to HHNYMEX Henry Hub ("HH") gas prices or regional index prices where the gas is sold. To diversify the gas prices it receives to international market prices, the Company sells a portion of its gas production at Dutch Title Transfer Facility ("Dutch TTF") prices. The Company uses derivative contracts to manage gas price volatility and basis swap contracts to reduce basis risk between HH prices and actual index prices at which the gas is sold.


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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

The following table sets forth the volumesVolumes per day associated with the Company's outstanding gas derivative contracts as of December 31, 20172020 and the weighted average gas prices for those contracts:contracts are as follows:
2021
First
Quarter
Second QuarterThird QuarterFourth Quarter
NYMEX swap contracts:
Volume per day (MMBtu)127,222 100,000 100,000 100,000 
Price per MMBtu$2.66 $2.68 $2.68 $2.68 
Dutch TTF swap contracts:
Volume per day (MMBtu)30,000 30,000 30,000 30,000 
Price per MMBtu$5.07 $5.07 $5.07 $5.07 
NYMEX collar contracts:
Volume per day (MMBtu)150,000 150,000 150,000 150,000 
Price per MMBtu:
Ceiling$3.15 $3.15 $3.15 $3.15 
Floor$2.50 $2.50 $2.50 $2.50 
Basis swap contracts:
Permian Basin index swap volume per day (MMBtu) (a)10,000 
Price differential ($/MMBtu)$(1.46)$$$
 2018 Year Ending December 31, 2019
 First
Quarter
 Second Quarter Third Quarter Fourth Quarter 
Swap contracts (a):         
Volume (MMBtu)30,000
 100,000
 100,000
 100,000
 
Price per MMBtu$3.37
 $3.00
 $3.00
 $3.00
 $
Collar contracts with short puts:         
Volume (MMBtu)100,000
 50,000
 50,000
 50,000
 
Price per MMBtu:         
Ceiling$3.82
 $3.40
 $3.40
 $3.40
 $
Floor$3.15
 $2.75
 $2.75
 $2.75
 $
Short put$2.57
 $2.25
 $2.25
 $2.25
 $
Basis swap contracts:         
Southern California index swap volume (MMBtu) (b)(c)80,000
 40,000
 80,000
 53,261
 80,000
Price differential ($/MMBtu)$0.34
 $0.30
 $0.30
 $0.43
 $0.31
Houston Ship Channel index swap volume (MMBtu) (b)(d)3,444
 
 
 
 
Price differential ($/MMBtu)$0.63
 $
 $
 $
 $
______________________
____________________
(a)Subsequent to December 31, 2017, the Company entered into additional swap contracts for 100,000 MMBtu per day of February 2018 production with a price of $3.46 per MMBtu.
(b)The referenced basis swap contracts fix the basis differentials between Permian Basin index prices and southern California or Houston Ship Channel index prices for Permian Basin gas forecasted for sale in southern California or the Gulf Coast region.
(c)Subsequent to December 31, 2017, the Company entered into additional basis swap contracts for 20,000 MMBtu per day of November 2018 through March 2019 production with a price differential of $0.77 per MMBtu.
(d)Subsequent to December 31, 2017, the Company entered into additional basis swap contracts for 10,000 MMBtu per day of February 2018 production with a price differential of $0.82 per MMBtu.
Marketing derivatives. Periodically,(a)The referenced basis swap contracts fix the basis differential between the index price at which the Company enters into buysells its Permian Basin gas and sellthe NYMEX index prices used in swap contracts.
Marketing derivatives.The Company's marketing arrangements to fulfill firm pipeline transportation commitments. Associated with thesederivatives reflect two long-term marketing arrangements,contracts that were entered in October 2019. Under the contract terms, beginning on January 1, 2021, the Company may enter into index swap contractsagreed to mitigate price risk. The following table sets forth the volumespurchase and simultaneously sell 50 thousand barrels of oil per day associatedat an oil terminal in Midland, Texas for a six-year term that ends on December 31, 2026. The price the Company pays to purchase the oil volumes under the purchase contract is based on a Midland WTI price and the price the Company receives for the oil volumes sold is a WASP that a non-affiliated counterparty receives for selling oil through their Gulf Coast storage and export facility at prices that are highly correlated with Brent oil prices during the same month of the purchase. Based on the form of the marketing contracts, the Company determined that the marketing contracts should be accounted for as derivative instruments.
Contingent consideration. The Company's right to receive contingent consideration in conjunction with the Company's outstanding marketingSouth Texas Divestiture was determined to be a derivative contractsfinancial instrument that is not designated as a hedging instrument. Prior to its settlement in July 2020, the contingent consideration was based on forecasted oil and NGL prices during each of December 31, 2017the five years from 2020 to 2024. See Note 3 and the weighted average pricesNote 4 and Note 15 for those contracts:additional information.
  2018
  First Quarter Second Quarter Third Quarter Fourth Quarter
Average Daily Oil Transportation Commitments Associated with Derivatives (Bbl):        
Basis swap contracts:        
Louisiana Light Sweet index swap volume (a) 10,000
 10,000
 6,739
 
Price differential ($/Bbl) $3.18
 $3.18
 $3.18
 $
Magellan East Houston index swap volume (a) 11,556
 11,703
 3,370
 
Price differential ($/Bbl) $3.29
 $3.30
 $3.30
 $
____________________
(a)The referenced basis swap contracts fix the basis differentials between NYMEX WTI and Louisiana Light Sweet or Magellan East Houston oil prices for Permian Basin oil forecasted for sale in the Gulf Coast region.
Interest rate derivatives. During 2017, the Company was party to interest rate derivative contracts whereby the Company would have received the three-month LIBOR rate for the 10-year period from December 2017 through December 2027 in exchange

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December 31, 2017, 20162020, 2019 and 2015

2018


for paying a fixed interest rate of 1.81 percent on a notional amount of $100 million on December 15, 2017. During the fourth quarter of 2017, the Company liquidated its interest rate derivative contracts for cash proceeds of $5 million. As of December 31, 2017, the Company did not have any interest rate derivatives outstanding.
Diesel derivatives. Periodically, the Company enters into diesel derivative swap contracts that mitigate fuel price risk.Fair value. The diesel derivative swap contracts are priced at an index that is highly correlated to the prices that the Company incurs to fuel its drilling rigs and fracture stimulation fleet equipment. During 2017, the Company liquidated its diesel derivative swap contracts for cash proceeds of $2 million. As of December 31, 2017, the Company did not have any diesel derivative contracts outstanding.
Tabular disclosurefair value of derivative financial instruments. All of the Company's derivatives are accounted for not designated as non-hedge derivativeshedging instruments is as of December 31, 2017 and December 31, 2016 and therefore all changes in the fair values of its derivative contracts are recognized as gains or losses in the earnings of the periods in which they occur. The Company classifies the fair value amounts of derivative assets and liabilities as net current or noncurrent derivative assets or net current or noncurrent derivative liabilities, whichever the case may be, by commodity and counterparty. The Company enters into derivatives under master netting arrangements, which, in an event of default, allows the Company to offset payables to and receivables from the defaulting counterparty.follows:
The aggregate fair value of the Company's derivative instruments reported in the accompanying consolidated balance sheets by type and counterparty, including the classification between current and noncurrent assets and liabilities, consists of the following:
As of December 31, 2020
TypeConsolidated
Balance Sheet
Location
Fair
Value
Gross Amounts
Offset in the
Consolidated
Balance Sheet
Net Fair Value
Presented in the
Consolidated
Balance Sheet
  (in millions)
Assets:
Commodity price derivativesDerivatives - current$$$
Commodity price derivativesDerivatives - noncurrent$$— $
0
Liabilities:
Commodity price derivativesDerivatives - current$198 $$198 
Marketing derivativesDerivatives - current$36 $$36 
Commodity price derivativesDerivatives - noncurrent$11 $$11 
Marketing derivativesDerivatives - noncurrent$55 $$55 
0

As of December 31, 2019As of December 31, 2019
TypeTypeConsolidated
Balance Sheet
Location
Fair
Value
Gross Amounts
Offset in the
Consolidated
Balance Sheet
Net Fair Value
Presented in the
Consolidated
Balance Sheet
 (in millions)
Assets:Assets:
Commodity price derivativesCommodity price derivativesDerivatives - current$32 $$32 
Marketing derivativesMarketing derivativesDerivatives - non current$21 $$21 
Fair Value of Derivative Instruments as of December 31, 2017
Type 
Consolidated
Balance Sheet
Location
 
Fair
Value
 
Gross Amounts
Offset in the
Consolidated
Balance Sheet
 
Net Fair Value
Presented in the
Consolidated
Balance Sheet
   (in millions)
Derivatives not designated as hedging instruments      
Asset Derivatives:      
Commodity price derivatives Derivatives - current $13
 $(2) $11
Contingent considerationContingent considerationOther assets - noncurrent$91 $$91 
Liabilities:Liabilities:
Commodity price derivatives Derivatives - noncurrent 3
 (3) 
Commodity price derivativesDerivatives - current$12 $$12 
     $11
Liability Derivatives:      
Commodity price derivatives Derivatives - current $234
 $(2) $232
Commodity price derivatives Derivatives - noncurrent 26
 (3) 23
Commodity price derivativesDerivatives - noncurrent$$$
     $255

Fair Value of Derivative Instruments as of December 31, 2016
Type 
Consolidated
Balance Sheet
Location
 
Fair
Value
 
Gross Amounts
Offset in the
Consolidated
Balance Sheet
 
Net Fair Value
Presented in the
Consolidated
Balance Sheet
    (in millions)
Derivatives not designated as hedging instruments      
Asset Derivatives:      
Commodity price derivatives Derivatives - current $33
 $(25) $8
Interest rate derivatives Derivatives - current 6
 
 6
        $14
Liability Derivatives:      
Commodity price derivatives Derivatives - current $102
 $(25) $77
Commodity price derivatives Derivatives - noncurrent 7
 
 7
        $84

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


The following table details the location of gainsFair value. Gains and losses recognizedrecorded on the Company's derivative contracts in the accompanying consolidated statements of operations:financial instruments not designated as hedging instruments is as follows:
Derivatives Not Designated
as Hedging Instruments
Location of Gain/(Loss) Recognized in Earnings on DerivativesYear Ended December 31,
202020192018
  (in millions)
Commodity price derivativesDerivative gain (loss), net$(147)$34 $(292)
Marketing derivativesDerivative gain (loss), net$(112)$21 $
Interest rate derivativesDerivative gain (loss), net$(22)$$
Contingent considerationInterest and other income (loss), net$(42)$(45)$
Derivatives Not Designated
as Hedging Instruments
 
Location of Gain/(Loss)
Recognized in Earnings
 on Derivatives
 
Amount of Gain/(Loss) Recognized in
Earnings on Derivatives
Year Ended December 31,
2017 2016 2015
    (in millions)
Commodity price derivatives Derivative gains (losses), net $(99) $(174) $873
Interest rate derivatives Derivative gains (losses), net (1) 13
 6
Total   $(100) $(161) $879
Derivative counterparties.The Company uses credit and other financial criteria to evaluate the credit standing of, and to select, counterparties to its derivative instruments. Although the Company does not obtain collateral or otherwise secure the fair value of its derivative instruments, associated credit risk is mitigated by the Company's credit risk policies and procedures.
The following table provides
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
Net derivative liabilities associated with the Company's net derivative assets or liabilitiesopen commodity derivatives by counterparty are as of December 31, 2017:follows:
As of December 31, 2020
(in millions)
Citibank$49 
Scotia Bank25 
JP Morgan Chase20 
Merrill Lynch18 
Wells Fargo Bank17 
J Aron & Company16 
Morgan Stanley Capital Group16 
Bank of Montreal15 
Macquarie Bank15 
Royal Bank of Canada
Toronto-Dominion
$201 
 Net Assets (Liabilities)
 (in millions)
Macquarie Bank$(31)
BMO Financial Group(30)
JP Morgan Chase(28)
Citibank, N.A.(28)
Morgan Stanley(21)
J. Aron & Company(21)
BNP Paribas(20)
Wells Fargo Bank, N.A.(20)
Merrill Lynch(20)
Nextera Energy(17)
Scotia Bank(5)
Societe Generale(4)
JP Morgan Ventures Energy Corp(2)
Toronto Dominion3
Total$(244)
See Note 2 for additional information.
NOTE F.6. Exploratory Well Costs
The Company capitalizes exploratory well and project costs until a determination is made that the well or project has either found proved reserves, is impaired or is sold. The Company's capitalized exploratory well and project costs are presentedincluded in proved properties in the accompanying consolidated balance sheets. If the exploratory well or project is determined to be impaired, the impaired costs are charged torecorded as exploration and abandonments expense.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


The following table reflects the Company'schanges in capitalized exploratory well and project activity during each of the years ended December 31, 2017, 2016 and 2015:cost are as follows:
 Year Ended December 31,
 20202019
 (in millions)
Beginning capitalized exploratory well costs$660 $509 
Additions to exploratory well costs pending the determination of proved reserves1,163 2,172 
Reclassification due to determination of proved reserves(1,325)(2,011)
Disposition of assets(6)
Exploratory well costs charged to exploration and abandonment expense(4)
Ending capitalized exploratory well costs$498 $660 
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Beginning capitalized exploratory well costs$323
 $306
 $305
Additions to exploratory well costs pending the determination of proved reserves1,956
 1,387
 1,178
Reclassification due to determination of proved reserves(1,764) (1,369) (1,160)
Exploratory well costs charged to exploration and abandonment expense(10) (1) (17)
Ending capitalized exploratory well costs$505
 $323
 $306
The following table provides an aging, as of December 31, 2017, 2016 and 2015Aging of capitalized exploratory costs and the number of projects for which exploratory well costs have been capitalized for a period greater than one year, based on the date of drilling was completed:completed, are as follows:
 Year Ended December 31,
 202020192018
 (in millions, except well counts)
Capitalized exploratory well costs that have been suspended:
One year or less$495 $660 $509 
More than one year
$498 $660 $509 
Number of projects with exploratory well costs that have been suspended for a period greater than one year (a)
 As of December 31,
 2017 2016 2015
 (in millions, except well counts)
Capitalized exploratory well costs that have been suspended:     
One year or less$493
 $318
 $303
More than one year12
 5
 3
 $505
 $323
 $306
Number of projects with exploratory well costs that have been suspended for a period greater than one year7
 3
 1
______________________
(a)The projects withone exploratory well costs that havehas been suspended for a period greater than one year at December 31, 2017 are in the Eagle Ford Shale area. The Company is evaluating both the well performance of similar wells completed in 2017 and whether to drill additional wells near these wells in order for all of the wells in the areascheduled to be fracture stimulated as a package, thereby improvingcompleted during the resource recovery for the area. The Company expects to complete its evaluationfirst half of these seven wells during 2018.

2021.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 20152018


NOTE G.7. Long-term Debt and Interest Expense
Long-termThe components of long-term debt, including the effects of issuance costs and issuance discounts, consisted of the following components at December 31, 2017 and 2016:are as follows:
 As of December 31,
 20202019
 (in millions)
Outstanding debt principal balances:
7.50% senior notes due 2020$$450 
3.45% senior notes due 2021140 500 
3.95% senior notes due 2022244 600 
0.25% convertible senior notes due 20251,323 
4.45% senior notes due 2026500 500 
7.20% senior notes due 2028241 250 
1.90% senior notes due 20301,100 
3,548 2,300 
Issuance costs and discounts(248)(11)
Total debt3,300 2,289 
Less current portion of long-term debt140 450 
Long-term debt$3,160 $1,839 
 December 31,
 2017 2016
 (in millions)
Outstanding debt principal balances: 
6.65% senior notes due 2017 (a)$
 $485
6.875% senior notes due 2018 (b)450
 450
7.500% senior notes due 2020450
 450
3.45% senior notes due 2021500
 500
3.95% senior notes due 2022600
 600
4.45% senior notes due 2026500
 500
7.20% senior notes due 2028250
 250
 2,750
 3,235
Issuance costs and discounts(18) (22)
Long-term debt2,732
 3,213
Less current portion of long-term debt (a) (b)449
 485
Long-term debt$2,283
 $2,728

(a)The 6.65% senior notes, net of $173 thousand of unamortized issuance costs and issuance discounts, are classified as current in the accompanying consolidated balance sheets as of December 31, 2016.
(b)The 6.875% senior notes, net of $106 thousand of unamortized issuance costs and issuance discounts, are classified as current in the accompanying consolidated balance sheets as of December 31, 2017.
Credit facility. During August 2015, theThe Company entered intomaintains a Second Amendment to its Second Amended and Restated 5-year Revolving Credit Agreement ("Creditrevolving corporate credit facility (the "Credit Facility") with a syndicate of financial institutions (the "Syndicate"), primarily to extend. As of December 31, 2020, the maturity of the credit facility from December 2017 to August 2020, while maintainingCredit Facility had aggregate loan commitments of $1.5 billion. The Company accounted for the entry into the Credit Facility asbillion, a modificationmaturity date of the prior agreementOctober 2023 and capitalized the debt issuance costs along with those unamortized issuance costs that remained from the issuance of the prior agreement. As of December 31, 2017, the Company had no0 outstanding borrowings under the Credit Facility.Facility and was in compliance with its debt covenants.
Borrowings under the Credit Facility may be in the form of revolving loans or swing line loans. Revolving loans represent loans made ratably by the Syndicate in accordance with their respective commitments under the Credit Facility and bear interest, at the option of the Company, based on (a) a rate per annum equal to the higher of the prime rate announced from time to time by Wells Fargo Bank, National Association or the weighted average of the rates on overnight Federalfederal funds transactions with members of the Federal Reserve System during the last preceding business day plus 0.5 percent plus a defined alternate base rate spread margin, which is currently 0.25 percent based upon the Company's debt rating or (b) a base Eurodollar rate, substantially equal to LIBOR, plus a margin (the "Applicable Margin"), which is currently 1.25 percent and is also determined by the Company's debt rating. Swing line loans represent loans made by a subset of the lenders in the Syndicate and may not exceed $150 million. Swing line loans under the Credit Facility bear interest at a rate per annum equal to the "ASK" rate for Federalfederal funds periodically published by the Dow Jones Market Service plus the Applicable Margin. Letters of credit outstanding under the Credit Facility are subject to a per annum fee, representing the Applicable Margin plus 0.125 percent. The Company also pays commitment fees on undrawn amounts under the Credit Facility that are determined by the Company's debt rating (currently 0.15 percent). Borrowings under the Credit Facility are general unsecured obligations.
The Credit Facility requires the maintenance of a ratio of total debt to book capitalization, subject to certain adjustments, not to exceed .600.65 to 1.0. As of December 31, 2017,2020, the Company was in compliance with all of its debt covenants.
Senior notes. The Company's 6.65% senior notes (the "6.65% Senior Notes") and 5.875% senior notes (the "5.875% Senior Notes") matured and were repaid in March 2017 and July 2016, respectively. The Company funded both the $485 million repaymentSee Note 19 for a discussion of the 6.65% Senior Notesprimary changes related to a First Amendment to Credit Agreement that was entered into by the Company subsequent to December 31, 2020.
Credit agreement. On April 3, 2020, the Company entered into a 364-Day Credit Agreement (the "364-Day Credit Agreement") with Wells Fargo Bank, National Association, as Administrative Agent, and the $455 million repaymentother agents and lenders party thereto. In May 2020, the Company terminated the 364-Day Credit Agreement in conjunction with the issuance of the 5.875% Senior Notes0.25% Convertible Notes. During the year ended December 31, 2020, the Company recognized a $2 million loss on the early extinguishment of debt in other expense in the consolidated statements of operations for unamortized deferred financing costs associated with cash on hand. The Company's 6.875%

the 364-Day Credit Agreement. See Note 16 for additional information.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

Convertible senior notes. In May 2020, the Company issued $1.3 billion principal amount of 0.25% convertible senior notes (the "6.875% Senior Notes"due 2025. Interest on the Convertible Notes is payable semiannually in arrears on May 15 and November 15 of each year, beginning on November 15, 2020. The Convertible Notes will mature on May 15, 2025, unless earlier redeemed, repurchased or converted. The Convertible Notes are unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company.
The Convertible Notes are convertible into shares of the Company's common stock at an initial conversion rate of 9.1098 shares of the Company's common stock per $1,000 principal amount of the Convertible Notes (subject to adjustment pursuant to the terms of the notes indenture, the "Conversion Rate"), which represents an initial conversion price of $109.77 per share (subject to adjustment pursuant to the terms of the notes indenture, the "Conversion Price"). Upon conversion, the Convertible Notes will be settled in cash, shares of the Company's common stock or a combination thereof, at the Company's election. The Company intends to settle the principal amount of the Convertible Notes in cash.
Holders of the Convertible Notes may convert their notes at their option prior to February 15, 2025 under the following circumstances:
during the quarter following any quarter during which the last reported sales price of the Company's common stock exceeds 130 percent of the Conversion Price for at least 20 trading days;
during the five-day period following any five consecutive trading day period when the trading price of the Convertible Notes is less than 98 percent of the price of the Company's common stock times the Conversion Rate;
upon notice of redemption by the Company; or
upon the occurrence of specified corporate events, including certain consolidations or mergers.
On or after February 15, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders may convert their notes at any time. The Company may not redeem the Convertible Notes prior to May 20, 2023, and after such date, may redeem the Convertible Notes only if the last reported sale price of the Company's common stock has been at least 130 percent of the Conversion Price for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides the notice of redemption. The redemption price is equal to 100 percent of the principal amount of the Convertible Notes to be redeemed, plus accrued and unpaid interest.
The principal amount and related unamortized issuance costs and discount on the Convertible Notes are as follows:
As of December 31, 2020
(in millions)
Principal amount of Convertible Notes$1,323 
Unamortized discount on Convertible Notes (a)(206)
Unamortized issuance costs on Convertible Notes (b)(17)
Net carrying value$1,100 
______________________
(a)Upon issuance of the Convertible Notes, the Company recorded $234 million of unamortized discount to additional paid-in capital in the accompanying consolidated balance sheets. The Company will amortize the discount to interest expense at an effective interest rate of 4.3 percent over five years. For the year ended December 31, 2020, the Company amortized $28 million of the discount to interest expense.
(b)Upon issuance of the Convertible Notes, the Company allocated $19 million of unamortized issuance costs to long-term debt and $4 million of unamortized issuance costs to additional paid-in capital in the accompanying consolidated balance sheets. The Company will amortize the issuance costs recorded to long-term debt to interest expense at an effective interest rate of 4.3 percent over five years. For the year ended December 31, 2020 the Company amortized $2 million of issuance costs to interest expense.

Capped call transactions. In connection with the issuance of the Convertible Notes, the Company entered into privately negotiated capped call transactions with certain financial institution counterparties (the "Capped Call"), the purpose of which was to reduce the potential dilution to the Company's common stock upon conversion of the Convertible Notes and/or offset any cash payments the Company is required to make in excess of the principal amount of such converted notes, with such reduction and offset subject to a capped price. The Capped Call transactions have a strike price of $109.77 per share of common
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
stock and a capped price of $156.21 per share of common stock. The net costs of $113 million incurred to purchase the Capped Call transactions were recorded as a reduction to additional paid-in capital in the accompanying consolidated balance sheets.
Senior notes. During August 2020, the Company issued $1.1 billion of 1.90% senior notes due August 15, 2030 and received proceeds, net of $19 million of issuance costs and discounts, of $1.08 billion. The notes bear an annual interest rate of 1.90 percent and interest is payable semiannually in arrears on February 15 and August 15 of each year, commencing on February 15, 2021. The senior notes are unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company.
In May 2020, the Company paid $725 million to complete a cash tender offer for certain of its outstanding senior notes. Associated with the tender offer, the Company settled $360 million of its 3.45% senior notes due 2021, $356 million of its 3.95% senior notes due 2022 and $9 million of its 7.20% senior notes due 2028. The Company expensed unamortized debt discounts and issuance costs associated with the tendered notes of $2 million and recognized a loss on the early extinguishment of debt totaling $23 million. The losses are recorded in other expense in the consolidated statements of operations. See Note 16 for additional information.
The Company's 7.50% senior notes, with a debt principal balance of $450 million, will maturematured and were repaid in May 2018.January 2020. The 6.875% Senior Notes are classified as current inCompany funded the accompanying consolidated balance sheets as of December 31, 2017.repayment with cash on hand.
The Company's senior notes are general unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company and are senior in right of payment to all existing and future subordinated indebtedness of the Company. The Company is a holding company that conducts all of its operations through subsidiaries; consequently, the senior notes are structurally subordinated to all obligations of its subsidiaries. Interest on the Company's senior notes is payable semiannually.
Principal maturities. Principal maturities ofpayments scheduled to be made on the Company's long-term debt at December 31, 2017, are as follows (in millions):
2021$140 
2022$244 
2023$
2024$
2025$1,323 
Thereafter$1,841 
2018$450
2019$
2020$450
2021$500
2022$600
Thereafter$750
Interest expense activity is as follows:
Interest expense. The following amounts have been incurred and charged to interest expense for the years ended December 31, 2017, 2016 and 2015:
 Year Ended December 31,
 202020192018
 (in millions)
Cash payments for interest$102 $117 $133 
Accretion of finance lease17 
Amortization of issuance discounts29 
Amortization of capitalized loan fees
Net changes in accruals(19)(6)
Interest incurred134 126 132 
Less capitalized interest(5)(5)(6)
Total interest expense$129 $121 $126 

 Year Ended December 31,
 2017 2016 2015
 (in millions)
Cash payments for interest$164
 $196
 $148
Amortization of issuance discounts1
 9
 13
Amortization of capitalized loan fees4
 4
 5
Net changes in accruals(9) 2
 25
Interest incurred160
 211
 191
Less capitalized interest(7) (4) (4)
Total interest expense$153
 $207
 $187
NOTE H.8. Incentive Plans
Deferred compensation retirement plan. In August 1997, the Compensation Committee of the The Company's board of directors (the "Board") approved a deferred compensation retirement plan allows for thequalified officers and certain key employees of the Company. Each officer and key employee is allowedCompany to contribute up to 2550 percent of their base salary, an increase from 25 percent prior to 2019, and 100 percent of their annual bonus. The Company will provideprovides a matching contribution of 100 percent of the officer's and key employee's contribution limited up to the first ten10 percent of the officer's base salary and eight8 percent of
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
the key employee's base salary. In response to cost savings measures implemented in response to the COVID-19 pandemic, the Company's matching contribution was reduced to 50 percent of the officer's and key employee's contribution, limited to the first 10 percent of the officer's base salary and 8 percent of the key employee's base salary.salary, beginning on May 25, 2020. In January 2021, the matching contribution was reinstated to 100 percent of the officer's and key employee's contribution limited up to the first 10 percent of the salary of all participants in the plan. The Company's matching contribution vests immediately. A trust fund has been established by the Company to accumulate the contributions made under this retirement plan.
The Company's matching contributions were $3 millionCompany match for each of the years ended December 31, 2017, 2016 and 2015, respectively.deferred compensation plan is as follows:

Year Ended December 31,
202020192018
(in millions)
Deferred compensation plan$$$
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


401(k) plan. The Pioneer Natural Resources USA, Inc. ("Pioneer USA," a wholly-owned subsidiary of the Company) 401(k) and Matching Plan (the "401(k) Plan") is a defined contribution plan established under the Internal Revenue Code Section 401. All regular full-time and part-time employees of Pioneer USA are eligible to participate in the 401(k) Plan on the first day of the month following their date of hire. Participants may contribute an amount up to 80 percent of their annual base salary into the 401(k) Plan. Matching contributions are made to the 401(k) Plan in cash by Pioneer USA in amounts equal to 200 percent of a participant's contributions to the 401(k) Plan that are not in excess of five5 percent of the participant's annual base compensationsalary (the "Matching Contribution"). In response to cost savings measures implemented in response to the COVID-19 pandemic, the 401(k) Plan was amended such that the Matching Contributions were reduced from 200 percent to 100 percent of a participant's contributions to the 401(k) Plan that are not in excess of 5 percent of the participant's annual base salary for each pay period beginning on May 25, 2020. In January 2021, the Matching Contributions were increased from 100 percent of a participant's contributions to the 401(k) Plan that are not in excess of 5 percent of the participant's annual base salary to 100 percent of a participant's contributions to the 401(k) Plan that are not in excess of ten percent of the participant's annual base salary. Each participant's account is credited with the participant's contributions, Matching Contributions and allocations of the 401(k) Plan's earnings. Participants are fully vested in their account balances except for Matching Contributions and their proportionate share of 401(k) Plan earnings attributable to Matching Contributions, which proportionately vest over a four-year4-year period that begins withon the participant's date of hire. DuringEligible employees are automatically enrolled in the years ended December 31, 2017, 2016 and 2015, the Company recognized compensation expense401(k) Plan at a contribution rate of $25 million, $23 million and $31 million, respectively, as a result of Matching Contributions.
Stock-based compensation costs. In accordance with GAAP, the Company records stock-based compensation expense ratably over the vesting periods5 percent of the Company's stock-based compensation awards usingemployee's annual base salary, unless the awards' fair value. employee opts out of participation or makes an alternate election within 30 days of becoming eligible for participation.
The Company maintains two plans providingmatch for stock-based compensation: the 401(k) plan is as follows:
Year Ended December 31,
202020192018
(in millions)
401(k) plan$18 $27 $36 
Long-Term Incentive Plan.The Company's Amended and Restated 2006 Long-Term Incentive Plan ("LTIP") and the Employee Stock Purchase Plan ("ESPP").
Long-Term Incentive Plan.The LTIP provides for the granting of various forms of awards, including stock options, stock appreciation rights, performance units, restricted stock and restricted stock units to directors, officers and employees of the Company.
The shares to be delivered under the LTIP shall be made available from (i) authorized but unissued shares, (ii) shares held as treasury stock or (iii) previously issued shares reacquired by the Company, including shares purchased on the open market. In May 2016, the stockholders of the Company approved a 3.5 million increase in the number of shares available under the plan. The following table shows the number of shares available for issuancegrant pursuant to awards under the LTIP at December 31, 2017:
is as follows:
As of December 31, 2020
Approved and authorized awards12,600,000
Awards issued under plan(7,657,755(8,861,276))
Awards available for future grant4,942,2453,738,724 
Employee Stock Purchase Plan.The ESPPCompany's Employee Stock Purchase Plan ("ESPP") allows eligible employees to annually purchase the Company's common stock at a discounted price. Officers of the Company are not eligible to participate in the ESPP. Contributions to the ESPP are limited to 15 percent of an employee's paybase salary (subject to certain ESPP limits) during the eight-montheight-month offering period (January 1 to August 31). Participants in the ESPP purchase the Company's common stock at a price that is 15 percent below the closing sales price of the Company's common stock on either the first day or the last day of each offering period, whichever closing sales price is lower. The following table shows the number of shares available for issuance under the ESPP at December 31, 2017:
Approved and authorized shares1,250,000
Shares issued(951,285)
Shares available for future issuance298,715
The following table reflects stock-based compensation expense recorded for each type of stock-based compensation award and the associated income tax benefit for the years ended December 31, 2017, 2016 and 2015:
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Restricted stock-Equity Awards$60
 $66
 $70
Restricted stock-Liability Awards24
 24
 22
Stock options (a)
 
 
Performance unit awards17
 21
 18
ESPP2
 2
 2
Total$103
 $113
 $112
Income tax benefit$19
 $34
 $34
_____________________

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

The number of shares available for issuance under the ESPP is as follows:
(a)Cash proceeds received from stock option exercises during 2017As of December 31, 2020
Approved and 2016 amounted to $300 thousand and $1 million, respectively. There were no stock option exercises during 2015.authorized shares1,250,000 
Shares issued(1,118,790)
Shares available for future issuance131,210 
Stock-based compensation expense and the associated income tax benefit for awards issued under both the LTIP and ESPP are as follows:
 Year Ended December 31,
 202020192018
 (in millions)
Restricted stock - Equity Awards$49 $79 $65 
Restricted stock - Liability Awards12 19 17 
Performance unit awards21 19 18 
Employee Stock Purchase Plan
Total stock-based compensation expense$84 $119 $102 
Income tax benefit$$18 $17 
As of December 31, 2017,2020, there was $94$77 million of unrecognizedunrecorded stock-based compensation expense related to unvested share-based compensation plans, including $22$17 million attributable to Liability Awards that are expected to be settled in cash on their vesting dates. The stock-based compensation expense will be recognized on a straight-line basis over theweighted average remaining vesting periodsperiod of the awards which is a period of less than three years on a weighted average basis.years.
Restricted stock awards. During 2017,2020, the Company awarded 450,619522,814 restricted shares or units of the Company's common stock as compensation to directors, officers and employees of the Company, (including 117,984including 136,136 shares or units representing Liability Awards). The Company's issued shares, as reflected in the accompanying consolidated balance sheet as of December 31, 2017, do not include 77,727 of issued, but unvested shares awarded under stock-based compensation plans that have voting rights.Awards.
The following table reflects the restrictedRestricted stock award activity is as follows:
Year Ended December 31, 2020
Equity AwardsLiability Awards
 Number of SharesWeighted
Average Grant-
Date Fair
Value
Number of shares
Beginning incentive compensation awards824,193 $149.99 246,851 
Awards granted386,678 $108.24 136,136 
Awards forfeited(52,607)$115.00 (28,228)
Awards vested (a)(392,283)$151.16 (133,406)
Ending incentive compensation awards765,981 $130.72 221,353 
______________________
(a)Per the terms of award agreements and elections, the issuance of common stock may be deferred for certain restricted stock equity awards, performance units and stock options that vest during the year ended December 31, 2017:
 Equity Awards Liability Awards
 
Number of
Shares
 
Weighted
Average Grant-
Date Fair
Value
 
Number of
Shares
Outstanding at beginning of year1,077,227
 $143.39
 290,552
Shares granted332,635
 $180.50
 117,984
Shares forfeited(33,283) $153.17
 (20,687)
Shares vested(460,356) $153.06
 (135,114)
Outstanding at end of year916,223
 $151.71
 252,735
period.
The weighted average grant-date fair value per unit of restricted stock equity awardsEquity Awards awarded during 2017, 20162020, 2019 and 20152018 was $180.50, $122.72$108.24, $137.23 and $153.55,$180.66, respectively. The grant-date fair value of restricted stock equity awardsEquity Awards that vested during 2017, 20162020, 2019 and 20152018 was $70$59 million, $66$99 million and $76$67 million, respectively.
As of December 31, 20172020 and 2016,2019, accounts payable - due to affiliates in the accompanying consolidated balance sheets includes $20$7 million and $22$11 million, respectively, of liabilities attributable to the Liability Awards, representing the fair value of the earned, but unvested, portion of the outstanding awards as of that date. The cash paid for Liability Awards that vested during 2017, 2016 and 2015 was $20 million, $18 million and $29 million, respectively.
Stock option awards. Certain employees may be granted options to purchase shares of the Company's common stock with an exercise price equal to the fair market value of Pioneer common stock on the date of grant. The fair value of stock option awards is determined using the Black-Scholes option-pricing model. Option awards have a ten-year contract life. The expected life of an option is estimated based on historical and expected exercise behavior. The volatility assumption was estimated based upon expectations of volatility over the life of the option as measured by historical volatility. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the option. The dividend yield was based upon a seven-year average dividend yield.
A summary of the Company's nonstatutory stock option awards activity for the year ended December 31, 2017 is presented below:
 
Number
of Shares
 
Weighted
Average
Exercise Price
 
Weighted Average
Remaining
Contractual Life
 
Aggregate
Intrinsic Value
     (in years) (in millions)
Outstanding at beginning of year159,378
 $89.03
    
Options exercised(20,885) $15.62
    
Outstanding at end of year138,493
 $100.10
 3.61 $10
Exercisable at end of year138,493
 $100.10
 3.61 $10

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

Cash paid for vested Liability Awards is as follows:
The Company has not granted stock options since February 2012. The intrinsic value of options exercised during 2017 and 2016 was $3 million and $6 million, respectively, based on the difference between the market price at the exercise date and the option exercise price. There were no options exercised during 2015.
Year Ended December 31,
202020192018
(in millions)
Cash paid for vested Liability Awards$16 $20 $24 
Performance unit awards. During 2017, 2016 and 2015, Each year, at its discretion, the Company awardedawards performance units to certain of the Company's officers under the LTIP. The number of shares of common stock to be issued is determined by comparing the Company's total shareholder return to the total shareholder return of a predetermined group of peer companies over the performance period. The performance unit awards vest over a 34-month service period.
The grant-date fair valuesvalue per unit of the 2017, 20162020, 2019 and 20152018 performance unit awards were $258.27, $203.69$184.06, $165.84 and $222.33,$246.18, respectively, which amounts were determined using the Monte Carlo simulation method and are being recognizedrecorded as stock-based compensation expense ratably over the performance period. The fair value of the performance unit awards was determined using the Monte Carlo simulation model that utilizes multiple input variables thatto determine the probability of satisfying the market condition stipulated in the award grant and calculates the fair value of the award. Expected volatilities utilized in the model were estimated using a historical period consistent with the performance period of approximately three years. The risk-free interest rate was based on the United States Treasury rate for a term commensurate with the expected life of the grant. The Company
Assumptions used the following assumptions to estimate the fair value of performance unit awards granted during 2017, 2016in each of the following years are as follows:
202020192018
Risk-free interest rate0.68%2.49%2.41%
Range of volatilities30.9% -44.7%27.7% -43.4%30.4% -53.3%
Performance unit activity is as follows:
Year Ended December 31, 2020
Number of
Units (a)
Weighted 
Average Grant-
Date Fair
Value
Beginning performance unit awards116,215 $191.58 
Units granted132,621 $184.06 
Units vested (b)(41,406)$238.68 
Ending performance unit awards207,430 $177.37 
_____________________
(a)Amount reflects the number of performance units initially granted. The actual payout of shares upon vesting may be between 0 and 2015:
 2017 2016 2015
Risk-free interest rate1.42% 0.96% 1.03%
Range of volatilities33.6% -58.2% 28.3% -53.6% 26.1% -41.3%
The following table summarizes250 percent of the performance unit activity forunits included in this table depending upon the year ended December 31, 2017:total shareholder return ranking of the Company compared to peer companies at the vesting date.
 
Number of
Units (a)
 
Weighted  Average
Grant-Date
Fair Value
Beginning performance unit awards178,556
 $211.46
Units granted59,044
 $258.27
Units forfeited
 $
Units vested (b)(74,442) $222.33
Ending performance unit awards163,158
 $223.45
_____________________
(a)These amounts reflect(b)Units vested reflects the number of performance units granted. The actual payout of shares may be between zero percent and 250 percent of the performance units granted depending upon the total shareholder return ranking of the Company compared to peer companies at the vesting date.
(b)On December 31, 2017, the service period lapsed on 78,796 performance unit awards that earned 1.50 shares for each vested award, representing 118,198 aggregate shares of common stock issued on January 2, 2018. The vested performance units that earned 1.50 shares for each vested award included 74,442 units vested in the current year, 4,029 units that vested in 2016 and 325 units that vested in 2015 upon the retirement of the officers to whom the performance unit awards were granted.
The grant-date fair value of performance units that vest upon retirement or departure of eligible officers or when the service period on the award has ended. Awards that vest upon retirement or departure of eligible officers are not transferred to the officer until the original service period of the award lapses. Of the 41,406 units that vested, during 2017, 20164,173 units vested upon retirement of eligible officers in 2020 and 2015 was $18 million, $15 millionwill be issued when the performance period ends in 2021 and $17 million, respectively.2022. On December 31, 2020, the service period lapsed on 62,541 performance unit awards that earned 1.70 shares for each vested award resulting in 106,329 aggregate shares of common stock being issued on January 2, 2021. Of the 62,541 performance unit awards that lapsed, 25,308 units were associated with units that vested in prior years upon retirement or departure of eligible officers.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

The grant-date fair value of vested performance units is as follows:
Year Ended December 31,
202020192018
(in millions)
Grant-date fair value of vested performance units$10 $22 $21 

NOTE I.9. Asset Retirement Obligations
The Company's asset retirement obligations primarily relate to the future plugging and abandonment of wells and related facilities. Market risk premiums associated with asset retirement obligations are estimated to represent a component of the Company's credit-adjusted risk-free rate that is utilized in the calculations of asset retirement obligations.
Asset retirement obligations activity is as follows:
 Year Ended December 31,
 20202019
 (in millions)
Beginning asset retirement obligations$191 $183 
New wells placed on production
Changes in estimates (a)109 82 
Dispositions(37)
Liabilities settled(32)(52)
Accretion of discount10 
Ending asset retirement obligations282 191 
Less current portion of asset retirement obligations42 73 
Asset retirement obligations, long-term$240 $118 
_____________________
(a)Changes in estimates are determined based on several factors, including abandonment cost estimates based on recent actual costs incurred to abandon wells, credit-adjusted risk-free discount rates and well life estimates. The following table summarizes2020 change in estimate is primarily due to decreases in commodity prices, which had the effect of shortening well life estimates and increasing the present value of the abandonment obligation. The 2019 change in estimate is primarily due to accelerating the forecasted timing of abandoning certain of the Company's asset retirementvertical oil and gas wells, which had the effect of increasing the present value of the abandonment obligation activity duringattributable to those wells.
NOTE 10. Leases
The Company had a variable interest in the years ended entity responsible for constructing the Company's corporate headquarters (the "Hidden Ridge Building"). The Company was not the primary beneficiary of the variable interest entity and only had a profit sharing interest after certain economic returns were achieved. The Company had no exposure to the variable interest entity's losses or future liabilities, if any. In December 2019, the Company sold its interest in the variable interest entity for net cash proceeds of $56 million and recognized a net gain on the sale of the building of $56 million, which is recorded in interest and other income in the consolidated statement of operations. The Company has no continuing involvement in the entity subsequent to the sale. See Note 15 for additional information.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015:2018
The Company recognized a finance lease upon commencement of the Hidden Ridge Building lease in October 2019, the balances of which are as follows:
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Beginning asset retirement obligations$297
 $285
 $189
Obligations assumed in acquisitions
 2
 
New wells placed on production3
 2
 4
Changes in estimates (a)(9) 17
 103
Dispositions(7) 
 
Liabilities settled(32) (27) (23)
Accretion of discount19
 18
 12
Ending asset retirement obligations$271
 $297
 $285
As of December 31,
TypeConsolidated Balance Sheet Location20202019
(in millions)
Assets:
Finance lease right-of-use assetOther property and equipment, net$528 $556 
Liabilities:
Finance lease liability, currentCurrent other liabilities$17 $16 
Finance lease liability, noncurrentNoncurrent other liabilities$539 $556 
 _____________________
(a)Changes in estimates are determined based on several factors, including abandonment cost estimates based on recent actual costs incurred to abandon wells, credit-adjusted risk-free discount rates and well life estimates. The decrease in 2017 was primarily due to a increase in commodity prices, which has the effect of lengthening the economic life of the Company's producing wells. The increase in 2016 was primarily due to the forecasted timing of abandoning the Company's oil and gas wells being accelerated as a result of lower commodity prices, which has the effect of shortening the economic lives of the Company's producing wells.
In November 2019, the Company recorded accelerated amortization of $28 million in other expense in the consolidated statements of operations to fully amortize the remaining operating lease right-of-use asset associated with its former corporate headquarters. As of December 31, 20172020, the consolidated balance sheet includes $13 million of operating lease liabilities related to its former corporate headquarters. See Note 16 for additional information.
The components of lease costs, including amounts recoverable from joint operating partners, are as follows:
Year Ended December 31,
20202019
(in millions)
Finance lease cost:
Amortization of right-of-use asset (a)$28 $
Interest on lease liability17 
Operating lease cost (b)151 200 
Short-term lease cost (c)23 33 
Variable lease cost (d)27 73 
Total lease cost$246 $317 
_____________________
(a)Represents straight-line rent cost associated with the Company's finance lease right-of-use asset.
(b)Represents straight-line rent cost associated with the Company's operating lease right-of-use assets.
(c)Represents costs associated with short-term leases (those with a contractual term of 12 months or less) that are not included in the consolidated balance sheets.
(d)Variable lease costs are primarily comprised of the non-lease service component of drilling rig commitments above the minimum required payments. Both the minimum required payments and 2016, the current portionsnon-lease service component of the drilling rig commitments are capitalized as additions to oil and gas properties.
For the year ended December 31, 2020, cash payments of $83 million for operating, short-term and variable leases and $17 million for finance leases are included in net cash provided by operating activities and $16 million of finance lease principal payments are included in net cash used in financing activities in the consolidated statements of cash flows. For the same period, the Company also incurred operating and variable lease costs associated with drilling operations of $130 million, which are capitalized as additions to oil and gas properties and are included in investing cash flows in the consolidated statements of cash flows.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
The changes in lease liabilities are as follows:
Year Ended December 31, 2020Year Ended December 31, 2019
OperatingFinanceOperatingFinance
(in millions)
Beginning lease liabilities$306 $572 $325 $
Liabilities assumed in exchange for new right-of-use
assets (a)
33 142 573 
Contract modifications (b)27 
Dispositions(1)
Liabilities settled(163)(33)(177)(5)
Accretion of discount (c)17 13 
Ending lease liabilities (d)$210 $556 $306 $572 
______________________
(a)Represents noncash leasing activity. The weighted-average discount rate used to determine the present value of future operating and finance lease payments is 2.5 percent and 3.0 percent respectively, in 2020 and 3.3 percent and 3.0 percent, respectively, in 2019.
(b)Represents changes in lease liabilities due to modifications of original contract terms.
(c)Represents imputed interest on discounted future cash payments.
(d)As of December 31, 2020, the weighted-average remaining lease term of the Company's asset retirementoperating and finance leases is three and 19 years, respectively, as compared to three and 20 years in 2019.

Maturities of lease obligations were $41 million and $39 million, respectively.are as follows:
As of December 31, 2020
OperatingFinance
(in millions)
2021$107 $33 
202263 34 
202326 35 
202435 
202536 
Thereafter14 564 
Total lease payments223 737 
Less present value discount(13)(181)
Present value of lease liabilities$210 $556 

NOTE J.11. Commitments and Contingencies
Severance agreements. The As of December 31, 2020, the Company has entered into severance and change in control agreements with its officers and certain key employees. The current annual salaries for the officers and key employees covered under such agreements total $32$12 million.
Indemnifications. The Company has agreed to indemnify its directors and certain of its officers, employees and agents with respect to claims and damages arising from acts or omissions taken in such capacity, as well as with respect to certain litigation.
Legal actions. The Company is party to various proceedings and claims incidental to its business. While many of these matters involve inherent uncertainty, the Company believes that the amount of the liability, if any, ultimately incurred with respect to these 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 records reserves for
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
contingencies when information available indicates that a loss is probable and the amount of the loss can be reasonably estimated.
Environmental. Environmental expenditures that relate to an existing condition caused by past operations and that have no future economic benefits are expensed. Environmental expenditures that extend the life of the related property or mitigate or prevent future environmental contamination are capitalized. Liabilities for expenditures that will not qualify for capitalization are recorded when environmental assessment and/or remediation is probable and the costs can be reasonably estimated. Such liabilities are undiscounted unless the timing of cash payments for the liability is fixed or reliably determinable. Environmental liabilities normally involve estimates that are subject to revision until settlement or remediation occurs.
Obligations following divestitures.In connection with its divestiture transactions, the Company may retain certain liabilities and providesprovide the purchaser certain indemnifications, subject to defined limitations, which may apply to identified pre-closing matters, including matters of litigation, environmental contingencies, royalty obligations and income taxes. Also associated with its divestiture transactions, the Company has issued and received guarantees to facilitate the transfer of contractual obligations, such as firm transportation agreements or gathering and processing arrangements. The Company does not believe thatrecognize a liability if the fair value of the obligation is immaterial and the likelihood of making payments under these obligationsguarantees is remote.
South Texas Divestiture. In conjunction with the South Texas Divestiture, the Company transferred its long-term midstream agreements and associated MVC's to the buyer. However, the Company retained the obligation to pay 100 percent of any deficiency fees associated with the MVC's from January 2019 through July 2022. The buyer is required to reimburse the Company for 18 percent of the deficiency fees paid by the Company from January 2019 through July 2022; such reimbursement will be paid by the buyer in installments beginning in 2023 through 2025. Assuming 100 percent of the MVC's are probablepaid as deficiency fees, the maximum amount of havingfuture payments for this obligation would be approximately $388 million as of December 31, 2020. The Company's estimated deficiency fee obligation as of December 31, 2020 is $333 million, of which $144 million is included in other current liabilities in the consolidated balance sheets. The corresponding estimated deficiency fee receivable from the buyer of $75 million is included in noncurrent other assets in the consolidated balance sheets. The Company has received credit support for the deficiency fee receivable of up to $100 million.
Raton transportation commitments. As part of the Raton Basin Sale, the Company transferred certain gas transportation commitments, which extend through 2032, to the buyer for which the Company has provided a material impact onguarantee. Assuming 100 percent of the remaining commitments are paid by the Company under its liquidity, financial position orguarantee, the maximum amount of future resultspayments would be approximately $77 million as of operations.December 31, 2020. The Company has received credit support for the commitments of up to $50 million. The Company paid $11 million in gas transportation fees associated with the transferred commitment for the year ended December 31, 2020 and was fully reimbursed.

West Eagle Ford Shale commitments. In April 2018, the Company completed the sale of its West Eagle Ford Shale gas and liquids field to an unaffiliated third party and transferred certain gas and liquids transportation commitments, which extend through 2022, to the buyer for which the Company has provided a guarantee. Assuming 100 percent of the remaining commitments are paid by the Company under its guarantee, the maximum amount of future payments would be approximately $24 million as of December 31, 2020. The Company has received credit support for the commitments of up to $19 million.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

Drilling commitments. TheCertain contractual obligations were retained by the Company after the South Texas Divestiture, the Raton Basin Sale, the divestiture of the Company's principal drilling commitments arepressure pumping assets and the decommissioning of the Company's sand mine operations in Brady, Texas. These contracts were primarily related to drilling rig contracts that require the Company to pay day rates for contracted drilling rigs over their contractual term. Certain of the drilling rig day rates are based upon oil pricesfirm transportation and are subject to change over the lives of the commitments. In addition, the Company periodically enters into contractual arrangements understorage agreements in which the Company is committedunlikely to expend funds to drill wellsrealize any benefit. The estimated obligations are included in other current or noncurrent liabilities in the future.consolidated balance sheets. The Company recognizes its drilling commitmentschanges in these contractual obligations are as follows:
Year Ended December 31, 2020
(in millions)
Beginning contract obligations$468 
Liabilities settled(200)
Accretion of discount13
Changes in estimate (a)79
Ending contract obligations$360 
______________________
(a)Primarily represents changes in the periods in whichCompany's forecasted deficiency fee payments associated with the rig services are performed.South Texas Divestiture and the difference between estimated and actual liabilities settled associated with the Raton transportation commitments.
Lease agreements. The Company leases equipment and office facilities under operating leases. Rent expense for the years ended December 31, 2017, 2016 and 2015 was $69 million, $59 million and $58 million, respectively.
In June 2017, the Company entered into a 20-year operating lease for the Company's new corporate headquarters that is currently being constructed in Irving, Texas. Annual base rent is expected to be $33 million and lease payments are expected to commence once the building is complete, which is anticipated to occur during the second half of 2019. The Company has a variable equity interest in the entity that is constructing the building. The Company is not the primary beneficiary of the variable interest entity and only has a profit sharing interest after certain economic returns are achieved. The Company has no exposure to the variable interest entity's losses or future liabilities, if any. The Company is the deemed owner of the building (for accounting purposes) during the construction period and is following the build-to-suit accounting guidance. Accordingly, as of December 31, 2017, the Company has capitalized $57 million of construction costs, including capitalized interest, within other property and equipment and has recognized a corresponding build-to-suit lease liability of $56 million. The recording of these assets and liabilities are considered noncash investing (other than capitalized interest) and financing items, respectively, for purposes of the consolidated statements of cash flows.
Firm purchase, gathering, processing, transportation and fractionation commitments. The Company from time to time enters into, and as of December 31, 2017 wasis a party to, take-or-pay agreements, which include contractual commitments (i) to purchase sand, water and waterdiesel for use in the Company's drilling operations, and contractual commitments(ii) with midstream service companies and pipeline carriers for future gathering, processing, transportation, fractionation and storage and fractionation.(iii) with oilfield services companies that provide drilling and pressure pumping services. These commitments are normal and customary for the Company's business activities. Certain future minimum gathering, processing, transportation, storagefractionation and fractionationstorage fees are based upon rates and tariffs that are subject to change over the livesterms of the commitments.
The Company's minimumMinimum firm commitments as of December 31, 2017 are as follows:
As of December 31, 2020
Firm Commitments
(in millions)
2021$577 
2022527 
2023453 
2024478 
2025436 
Thereafter1,833 
Total minimum firm commitments$4,304 
 Drilling Commitments Lease Commitments Purchase, Gathering, Processing, Transportation, Storage and Fractionation Commitments Total
 (in millions)
2018$93
 $27
 $568
 $688
2019$41
 $42
 $619
 $702
2020$37
 $53
 $672
 $762
2021$
 $40
 $627
 $667
2022$
 $37
 $476
 $513
Thereafter$
 $680
 $1,554
 $2,234
Total minimum commitments$171
 $879
 $4,516
 $5,566


Oil and gas delivery commitments. The Company has contracts that require delivery of fixed volumes of oil and gas. The Company intends to fulfill its short-term and long-term obligations with the Company's production or from purchases of third party volumes.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

Delivery commitments. The above commitments include demand fees associated with volume delivery commitments that are primarily related to the Permian Basin. If the Company does not expect to be able to fulfill its short-termfor oil and long-term delivery obligations from projected production of available reserves, the Company expects to purchase third party volumes, where applicable, to satisfy its commitment assuming it is economic to do so; otherwise, it will pay the demand fees associated with any commitment shortfalls. The Company's delivery commitments as of December 31, 2017gas are as follows:
As of December 31, 2020
OilGas
 (Bbls per day)(MMBtu per day)
202170,000 264,671 
202230,575 275,000 
2023279,178 
2024264,754 
2025125,000 
Thereafter405,822 
Total oil and gas delivery commitments100,575 1,614,425 
 Oil Gas
 (MBbls per day) (MMBtu per day)
201866,685
 
201963,356
 75,342
202068,347
 100,000
202170,000
 100,000
202230,575
 100,000
2023
 100,000
2024
 24,863

NOTE K.12. Related Party Transactions
Transactions with EFS Midstream. Prior to July 2015, the Company, through a wholly-owned subsidiary, owned a noncontrolling interest in its unconsolidated affiliate, EFS Midstream. In July 2015,December 2018, the Company completed the sale of its interestpressure pumping assets to ProPetro in EFS Midstreamexchange for 16.6 million shares of ProPetro common stock and $110 million of cash that was received during the first quarter of 2019. ProPetro is considered a related party as the shares received represent 16 percent of ProPetro's outstanding common stock. In addition to an unaffiliated third party.
Prior to July 2015,the sale of equipment and related facilities, the Company also (i) provided certainentered into a long-term agreement with ProPetro, under which it provides pressure pumping and related services. The costs of these services as the manager of EFS Midstreamare capitalized in accordance with a Master Services Agreement and (ii) contracted for services from EFS Midstream under a Hydrocarbon Gathering and Handling Agreement (the "HGH Agreement").
Master Services Agreement. The terms of the Master Services Agreement provided that the Company would perform certain manager services for EFS Midstream and be compensated by monthly fixed payments and variable payments attributable to expenses incurred by employees whose time was substantially dedicated to EFS Midstream's business. During 2015, the Company received $2 million of fixed payments and $9 million of variable payments, from EFS Midstream.
Hydrocarbon Gathering and Handling Agreement. Under the terms of the HGH Agreement, EFS Midstream was obligated to construct certain equipment and facilities capable of gathering, treating and transporting oil and gas production fromproperties as incurred. See Note 3 for additional information.
In October 2019, Phillip A. Gobe, a nonemployee member of the Eagle Ford Shale properties operatedCompany's board of directors, was appointed by the Company. board of directors of ProPetro to serve as its Executive Chairman, and in March 2020 he was appointed as Chief Executive Officer and Chairman of the Board of Directors. Mark S. Berg, the Company's Executive Vice President, Corporate Operations, serves as a member of the ProPetro board of directors under the Company's right acquired upon the sale of its pressure pumping assets to designate a director to the board of directors of ProPetro so long as the Company owns five percent or more of ProPetro's outstanding common stock.
Based on the Company's ownership in ProPetro and representation on the ProPetro board of directors, ProPetro is considered an affiliate and deemed to be a related party.
Transactions and balances with ProPetro are as follows:
Year Ended December 31,
20202019
(in millions)
Pressure pumping related services charges (a)$238 $461 
____________________
(a)Includes $41 million and $16 million of idle frac fleet fees for the years ended December 31, 2020 and December 31, 2019, respectively. SeeNote 16for additional information.

As of December 31,
20202019
(in millions)
Accounts receivable - due from affiliate (a)$$
Accounts payable - due to affiliate (b)$45 $88 
____________________
(a)Represents employee-related charges that were reimbursed by ProPetro.
(b)Represents pressure pumping and related services provided by ProPetro as part of a long-term agreement.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
The HGH Agreement obligatedCompany discloses ProPetro's summarized financial information on a one-quarter lag as it enables the Company to usereport its quarterly results independent from the EFS Midstream gathering, treating and transportation equipment and facilities. In accordance with the termstiming of when ProPetro reports its results. Summarized financial information for ProPetro is as follows:
Nine Months Ended September 30,
20202019
(in millions)
Revenue - service revenue$635 $1,618 
Cost of services (exclusive of depreciation and amortization)$469 $1,165 
Net income (loss)$(63)$140 

NOTE 13. Major Customers
Purchasers of the HGH Agreement, the Company paid EFS Midstream $54 million of gathering and treating fees during 2015 prior to its sale. Such amounts were expensed asCompany's oil, NGL and gas production costs in the accompanying consolidated statements of operations.
NOTE L.     Major Customers
The Company's share of oil and gas production is sold to various purchasers who must be prequalified under the Company's credit risk policies and procedures. The Company records allowances for doubtful accounts based on the age of accounts receivables and the financial condition of its purchasers and, depending on facts and circumstances, may require purchasers to provide collateral or otherwise secure their accounts.
The following purchasersthat individually accounted for ten percent or more of the Company's consolidated oil NGL and gas production revenues in at least one of the three years ended December 31, 2017:2020 are as follows:
 Year Ended December 31,
 2017 2016 2015
Sunoco Logistics Partners L.P. (a)21% 19% 18%
Occidental Energy Marketing Inc.16% 16% 18%
Plains Marketing LP14% 16% 22%
Enterprise Products Partners L.P.11% 12% 12%
 Year Ended December 31,
 202020192018
Sunoco Logistics Partners L.P.36 %33 %28 %
Occidental Energy Marketing Inc.18 %20 %17 %
Plains Marketing L.P.14 %13 %15 %
______________________
(a)Sunoco Logistics Partners L.P. ("Sunoco") acquired Vitol Inc.'s Permian Basin oil systems during the fourth quarter of 2016, and the Company's contracts with Vitol Inc. were transferred to Sunoco.
The loss of any of these significantmajor purchasers, which primarily purchase the Company's oil production, could have a material adverse effect on the ability of the Company to produce and sell its oil and gas production.
The Company enters into purchase transactions with third parties and separate sale transactions with third parties to diversify a portionPurchasers of the Company's WTIpurchased oil sales to a Gulf Coast and export market price and to satisfy unused pipeline capacity commitments. The following purchasersgas that individually accounted for ten percent or more of the Company's consolidated oil, NGL and gas revenues from sales of commodities purchased from third partiesoil and gas in at least one of the three years ended December 31, 2017:2020 are as follows:
 Year Ended December 31,
 2017 2016 2015
Occidental Energy Marketing Inc.39% 27% 25%
Valero Marketing and Supply Company14% 17% 50%
BP Energy11% 18% %
Exxon Mobil11% 23% 12%
 Year Ended December 31,
 202020192018
Occidental Energy Marketing Inc.28 %30 %34 %
The presentationloss of certain purchases and sales of third-party oil and gas with the same counterparty has been revised in 2016 and 2015 to present such transactions on a net basis in purchased oil and gas expense. Previously, these purchase and sales, which were carried out as purchases from and sales to the same third party, were separately stated on a gross basis in salesabove major purchaser of purchased oil and gas and purchased oil and gas expense. See Note B for additional information about the revision of the Company's revenues and expenses associated with these transactions.
The Company believes that the loss of any of these purchasers would not be expected to have an adverse effect on the ability of the Company to sell commodities it purchases from third parties.

NOTE 14. Revenue Recognition
Disaggregated revenue from contracts with purchasers.Revenues on sales of oil, NGL, gas and purchased oil, gas and diesel are recognized when control of the product is transferred to the purchaser and payment can be reasonably assured. Sales prices for oil, NGL and gas are negotiated based on factors normally considered in the industry, such as an index or spot price, distance from the well to the pipeline or market, commodity quality and prevailing supply and demand conditions. Accordingly, the prices received by the Company for oil, NGL and gas generally fluctuate similar to changes in the relevant market index prices.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

Disaggregated revenue from contracts with purchasers by product type is as follows:
Year Ended December 31,
20202019
 (in millions)
Oil sales$2,871 $4,168 
NGL sales490 510 
Gas sales269 238 
Total commodities sales3,630 4,916 
Sales of purchased oil3,359 4,726 
Sales of purchased gas24 29 
Sales of purchased diesel11 
Total sales of purchased commodities3,394 4,755 
Total revenue from contracts with purchasers$7,024 $9,671 
Performance obligations and contract balances. The majority of the Company's product sale commitments are short-term in nature with a contract term of one year or less. The Company typically satisfies its performance obligations upon transfer of control as described above in Disaggregated revenue from contracts with purchasers and records the related revenue in the month production is delivered to the purchaser. Settlement statements for sales of oil, NGL, gas and sales of purchased oil, gas and diesel may not be received for 30 to 60 days after the date the volumes are delivered, and as a result, the Company is required to estimate the amount of volumes delivered to the purchaser and the price that will be received for the sale of the product. The Company records the differences between estimates and the actual amounts received for product sales in the month that payment is received from the purchaser. As of December 31, 2020 and 2019, the accounts receivable balance representing amounts due or billable under the terms of contracts with purchasers was $661 million and $968 million, respectively.
NOTE M.15. Interest and Other Income (Loss), Net
The following table provides the components of the Company's interest and other income during(loss) are as follows:
 Year Ended December 31,
 202020192018
 (in millions)
Severance and sales tax refunds$13 $$
Deferred compensation plan income (loss)15 (2)
Interest income17 29 
Seismic data sales
Gain on sale of investment in Hidden Ridge Building (Note 10)
56 
Contingent consideration valuation adjustment (Note 4)
(42)(45)
Investment in affiliate valuation adjustment (Note 4)
(64)15 
Other12 
Interest and other income (loss), net$(67)$76 $38 

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
NOTE 16. Other Expense
The components of other expense are as follows:
 Year Ended December 31,
 202020192018
(in millions)
South Texas deficiency fee obligation, net (a)$80 $$
Termination and idle drilling and frac equipment charges (b)80 25 
Restructuring charges (c)79 159 
Loss on early extinguishment of debt (d)27 
Transportation commitment charges (e)16 74 161 
Legal and environmental charges12 19 21 
Parsley transactions costs (f)10 
Sand shortfall purchase penalty
Asset impairment (g)38 11 
Asset divestiture-related charges (h)25 170 
Sand mine decommissioning-related charges (i)23 443 
Corporate headquarters relocation-related costs (j)(1)41 
Vertical integration services (gain) loss (k)(2)15 
Other12 29 41 
Total other expense$321 $448 $849 
____________________
(a)Represents an increase in the Company's forecasted deficiency fee payments associated with the South Texas Divestiture offset by an increase in the forecasted deficiency fee receivable from the buyer. See Note 3 and Note 4 for additional information.
(b)Includes idle frac fleet fees, stacked drilling rig charges and drilling rig early termination charges.
(c)Primarily represents employee-related charges associated with the 2020 Corporate Restructuring and the 2019 Corporate Restructuring Program. See Note 3 and Note 8 for additional information.
(d)Represents the loss on early debt extinguishment attributable to certain of the Company's senior notes and its 364-day credit agreement. See Note 7 for additional information.
(e)Primarily represents firm transportation charges on excess pipeline capacity commitments.
(f)Represents legal, audit and other transactional costs incurred in conjunction with the Parsley acquisition.
(g)In 2019 and 2018, the charges primarily represent inventory and other asset impairment charges associated with the decommissioning of the Company's Brady, Texas sand mine and pumping services assets that have no future benefit to the Company. See Note 3 and Note 4 for additional information.
(h)Primarily represents employee-related charges and contract termination charges associated with the Company's divestitures. See Note 3 for additional information.
(i)Represents accelerated depreciation related to the decommissioning of the Company's Brady, Texas sand mine. See Note 3 for additional information.
(j)Represents costs associated with relocating to the Hidden Ridge Building, including $28 million of accelerated amortization of the operating lease right-of-use asset associated with the Company's former corporate headquarters and $12 million of exit and relocation-related costs.
(k)Primarily represents net margins (attributable to third party working interest owners) that result from Company-provided vertically integrated services, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three years ended December 31, 2017, 20162020, 2019 and 2015:2018, these vertical integration net margins included $42 million, $51 million and $128 million of gross vertical integration revenues, respectively, and $40 million, $66 million and $130 million of total vertical integration costs and expenses, respectively.
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Interest income$32
 $22
 $3
Severance, sales and property tax refunds13
 2
 
Deferred compensation plan income4
 3
 4
Other income4
 5
 10
Equity interest in income of EFS Midstream (a)
 
 5
Total interest and other income$53
 $32
 $22
107
 ______________________
(a)The Company accounted for its investment in EFS Midstream prior to its sale in July 2015 using the equity method. EFS Midstream provided gathering, treating and transportation services for the Company. See Note C for additional information on the Company's sale of EFS Midstream.

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
NOTE N.    Other Expense
The following table provides the components of the Company's other expense during the years ended December 31, 2017, 2016 and 2015:
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Transportation commitment charges (a)$167
 $109
 $53
Other58
 49
 27
Loss from vertical integration services (b)17
 54
 34
Impairment of inventory and other property and equipment (c)2
 8
 86
Idle drilling and well service equipment charges (d)
 64
 92
Restructuring charges (e)
 4
 23
Total other expense$244
 $288
 $315
____________________
(a)Primarily represents firm transportation payments on excess pipeline capacity commitments.
(b)Loss from vertical integration services primarily represents net margins (attributable to third party working interest owners) that result from Company-provided fracture stimulation and well service operations, which are ancillary to and supportive of the Company's oil and gas joint operating activities, and do not represent intercompany transactions. For the three years ended December 31, 2017, 2016 and 2015, these net losses include $140 million, $147 million and $298 million of gross vertical integration revenues, respectively, and $157 million, $201 million and $332 million of total vertical integration costs and expenses, respectively.
(c)Primarily represents charges to reduce excess materials and supplies inventories to their market values for the years ended December 31, 2017, 2016 and 2015, respectively. See Note D for additional information on the fair value of material and supplies inventory.
(d)Primarily represents expenses attributable to idle drilling rig fees that are not chargeable to joint operations and charges to terminate rig contracts that were not required to meet planned drilling activities.
(e)Represents restructuring costs associated with the Company's restructuring of its operations in South Texas in 2016 and Colorado in 2015. See Note B for additional information on the restructuring charges.
NOTE O.17. Income Taxes
The Company and its eligible subsidiaries file a consolidated United StatesU.S. federal income tax return. Certain subsidiaries are not eligible to be included in the consolidated United StatesU.S. federal income tax return and separate provisions for income taxes

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 2016 and 2015


have been determined for these entities or groups of entities. The tax returns and the amount of taxable income or loss are subject to examination by United StatesU.S. federal, state, local and foreign taxing authorities. The Company received tax refunds of $66 million (net of tax payments) during 2016 and made current and estimated tax payments of nil and $43 million (net of tax refunds) during 2017 and 2015, respectively.
The Company continually assesses 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 and assessesbased on that information, along with other data, reassesses the likelihood that the Company's net operating loss carryforwards ("NOLs") and other deferred tax attributes in the United StatesU.S. federal, state, local and foreign tax jurisdictions will be utilized prior to their expiration.
Enactment of the Consolidated Appropriations Act, 2021. On December 27, 2020, President Trump signed into law the Consolidated Appropriations Act, 2021 ("the Act").The Act includes many tax provisions, including the extension of various expiring provisions, extensions and expansions of certain earlier pandemic tax relief provisions, among other things.The Act did not have a material impact on the Company's current year tax provision or the Company's consolidated financial statements.
Enactment of the Coronavirus Aid, Relief and Economic Security Act. On March 27, 2020, President Trump signed into law the Coronavirus Aid, Relief and Economic Security Act ("CARES Act"). The CARES Act, among other things, includes provisions relating to refundable payroll tax credits, deferment of employer social security payments, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. The CARES Act did not have a material impact on the Company's current year tax provision or the Company's consolidated financial statements.
Enactment of the Tax Cuts and Jobs Act
Act. On December 22, 2017, the United StatesU.S. enacted the Tax Cuts and Jobs Act (the "Tax Reform Legislation"), which introducesintroduced significant changes to the United StatesU.S. federal income tax law. The changes that most impact the Company include:
A permanent reduction in the federal corporate income tax rate from 35 percent to 21 percent. The rate reduction is effective for the Company as of January 1, 2018. The application
Repeal of the rate change on the Company's existing deferred tax liabilities resulted in a $625 million income tax benefit to the Company during 2017.
The corporate alternative minimum tax ("AMT") for tax years beginning in January 1, 2018 has been repealed.. The Tax Reform Legislation provides that existing AMT credit carryovers are refundable beginning in 2018. As of December 31, 2017,2020, the Company hadCompany's AMT credit carryovers of $20 million that are expected to be fully refunded by 2022.have been substantially refunded.
The Tax Reform Legislation preserves the deductibility of intangible drilling costs and provides for 100 percent bonus depreciation on personal tangible property expenditures through 2022. The bonus depreciation percentage iswill be phased downout from 100 percent beginning in 2023 through 2026.
The Tax Reform Legislation is a comprehensive bill containing other provisions, such as limitations on the deductibility of interest expense and certain executive compensation, that are not expected to materially affect Pioneer. The ultimate impact of the Tax Reform Legislation may differ from the Company's estimates as of December 31, 2017 due to changes in the interpretations and assumptions made by the Company as well as additional regulatory guidance that may be issued.
Uncertain tax positions
. The Company recognizes the tax benefit from an uncertain tax position only if it is more likely than not that the tax position will be sustained upon examination by the taxing authorities, based upon the technical merits of the position. As of December 31, 2017 and 2016, the Company had unrecognized tax benefits of $124 million and $112 million, respectively,("UTBs") resulting from research and experimental expenditures related to horizontal drilling and completion innovations. If all or a portion ofIn December 2019, the unrecognized tax benefit is sustained upon examination byCompany and the taxing authorities effectively settled the uncertain tax benefit will be recognized as a reduction toposition for the Company's deferred2012-2015 tax liabilityyears. In December 2020, the Company and will affect the Company's effectivetaxing authorities effectively settled the remaining uncertain tax rate inposition for the period it is recognized. The2016-2018 tax years. As of December 31, 2020, the Company is unable to estimate the range of a reasonably likely outcome at this time. The Company expects to substantially resolve the uncertainties associated with the unrecognized tax benefits by December 2018.

no longer has any UTBs.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

Unrecognized tax benefit activity is as follows:
The following table sets forth changes in the Company's unrecognized
Year Ended December 31,
202020192018
(in millions)
Beginning unrecognized tax benefits$39 $141 $124 
Current year additions17 
Effectively settled tax positions(39)(102)
Ending unrecognized tax benefits$$39 $141 
Other tax benefits:matters.
Net tax refunds are as follows:
 Year Ended December 31,
 2017 2016
Balance at beginning of year$112
 $
Additions based on tax positions related to the current year12
 112
Reductions for tax positions of prior years
 
Balance at end of year$124
 $112
Year Ended December 31,
202020192018
(in millions)
Tax refunds, net$(13)$(5)$
Other Tax Matters
With respect to income taxes, the Company's policy is to account for interest charges as interest expense and any penalties as other expense in the accompanying consolidated statements of operations. The Company files income tax returns in the United StatesU.S. federal jurisdiction and various state and foreign jurisdictions. As of December 31, 2017,2020, there are no proposed adjustments in any jurisdiction that would have a significant effect on the Company's future results of operations or financial position.
The Company's earliest open years in itsthe Company's key jurisdictions are as follows:
U.S. federal20122016
Various U.S. states2013
The Company's incomeIncome tax benefit and amounts separately allocated were attributable to the following items for the years ended December 31, 2017, 2016 and 2015:(provision) is as follows:
 Year Ended December 31,
 202020192018
 (in millions)
Current:
U.S. federal$12 $$
U.S. state(3)(3)(2)
Current income tax benefit (provision)(2)
Deferred:
U.S. federal55 (228)(258)
U.S. state(3)(12)(16)
Deferred income tax benefit (provision)52 (240)(274)
Income tax benefit (provision)$61 $(235)$(276)
109
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Income tax benefit from continuing operations$524
 $403
 $155
Income tax benefit from discontinued operations$
 $
 $2
The Company's income tax (provision) benefit attributable to income from continuing operations consisted of the following for the years ended December 31, 2017, 2016 and 2015:
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Current:     
U.S. federal$5
 $22
 $(22)
U.S. state
 2
 (1)
 5
 24
 (23)
Deferred:     
U.S. federal526
 375
 165
U.S. state(7) 4
 13
 519
 379
 178
Income tax benefit from continuing operations$524
 $403
 $155

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PIONEER NATURAL RESOURCES COMPANY
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 2015

2018

Reconciliations of the United States federal statutory tax rate to the Company'sThe effective tax rate for income (loss) from continuing operationsis reconciled to the United States federal statutory rate as follows:
 Year Ended December 31,
 202020192018
 (in millions, except percentages)
Income (loss) before income taxes$(261)$1,008 $1,251 
Net loss attributable to noncontrolling interests
Income (loss) attributable to common stockholders before income taxes$(261)$1,008 $1,254 
Federal statutory income tax rate21 %21 %21 %
Benefit (provision) for federal income taxes at the statutory rate55 (212)(263)
State income tax provision (net of federal tax)(5)(12)(12)
Other11 (11)(1)
Income tax benefit (provision)$61 $(235)$(276)
Effective income tax rate, excluding net loss attributable to noncontrolling interests23 %23 %22 %

Significant components of deferred tax assets and deferred tax liabilities are as follows for the years endedfollows:
 As of December 31,
 20202019
 (in millions)
Deferred tax assets:
Net operating loss carryforward (a)$1,111 $1,039 
Credit carryforwards (b)110 101 
Asset retirement obligations61 41 
Incentive plans29 40 
Net deferred hedge losses68 
South Texas Divestiture62 75 
Lease deferred tax assets167 191 
Other47 47 
Deferred tax assets1,655 1,534 
Deferred tax liabilities:
Oil and gas properties, principally due to differences in basis, depletion and the deduction of intangible drilling costs for tax purposes(2,741)(2,628)
Other property and equipment, principally due to the deduction of bonus depreciation for tax purposes(196)(189)
Net deferred hedge gains(9)
South Texas Divestiture(16)(35)
Lease deferred tax liabilities(43)(61)
Convertible Notes(23)
Other(2)(5)
Deferred tax liabilities(3,021)(2,927)
Net deferred tax liability$(1,366)$(1,393)
____________________
(a)Net operating loss carryforwards as of December 31, 2017, 20162020 consist of $5 billion of U.S. federal NOLs, which expire between 2032 and 2015:2040. Additionally, the net operating loss carryforwards consist of $177 million of Colorado NOLs that begin to expire in 2027 and which has a fully offsetting valuation allowance.
(b)Credit carryforwards as of December 31, 2020, consist of $110 million of U.S. federal credits for research and experimental expenditures, which expire between 2032 and 2038.
 Year Ended December 31,
 2017 2016 2015
 (in millions, except percentages)
Income (loss) from continuing operations attributable to common stockholders before income taxes$309
 $(959) $(421)
Federal statutory income tax rate35 % 35% 35%
(Provision) benefit for federal income taxes at the statutory rate(108) 336
 147
State income tax (provision) benefit (net of federal tax)(4) 3
 8
State valuation allowance (net of federal tax)(1) (3) 
Change in federal income tax rate (a)625
 
 
Equity compensation excess tax benefit (b)9
 
 
Federal credit for increasing research activities (net of unrecognized tax benefits)6
 68
 
State credit for increasing research activities (net of unrecognized tax benefits and federal tax)
 4
 
Other(3) (5) 
Income tax benefit from continuing operations$524
 $403
 $155
Effective income tax rate, excluding net income attributable to the noncontrolling interests(170)% 42% 37%
110
____________________
(a)During 2017, the Company recognized a benefit of $625 million as a result of the December 22, 2017 Tax Reform Legislation that reduces the federal income tax rate beginning in 2018.
(b)During 2017, the Company recognized excess tax benefits of $9 million associated with the adoption of ASU 2016-09, "Improvements to Employee Share-Based Payment Accounting," which requires excess tax benefits or deficiencies associated with the vesting of long-term incentive awards to be recorded as income tax expense or benefit in the statement of operations rather than as an adjustment to additional paid-in capital in the balance sheet.

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2017, 20162020, 2019 and 20152018


The tax effects of temporary differences that give rise to significant portions of the deferred tax assets and deferred tax liabilities related to continuing operations are as follows as of December 31, 2017 and 2016:
 December 31,
 2017 2016
 (in millions)
Deferred tax assets: 
Net operating loss carryforward (a)$594
 $635
Credit carryforwards (b)87
 107
Asset retirement obligations59
 106
Incentive plans48
 81
Net deferred hedge losses52
 32
Other22
 30
Total deferred tax assets862
 991
Deferred tax liabilities:   
Oil and gas properties, principally due to differences in basis, depletion and the deduction of intangible drilling costs for tax purposes(1,640) (2,184)
Other property and equipment, principally due to the deduction of bonus depreciation for tax purposes(121) (204)
Total deferred tax liabilities(1,761) (2,388)
Net deferred tax liability$(899) $(1,397)
____________________
(a)Net operating loss carryforwards as of December 31, 2017 consist of $2.8 billion of U.S. federal NOLs, which expire between 2032 and 2037, and $164 million of Colorado NOLs, which expire between 2027 and 2037, and are net of a $6 million valuation allowance relating to $125 million of Colorado NOLs that the Company believes will more likely than not expire unutilized.
(b)Credit carryforwards as of December 31, 2017 consist of U.S. federal credits for increasing research activities of $82 million and Texas credits for increasing research activities of $5 million. The U.S. federal and state research credits as of December 31, 2017 exclude $124 million of unrecognized tax benefits.
NOTE P.18. Net Income (Loss) Per Share Attributable To Common Stockholders
In the calculation of basic net income (loss) per share attributable to common stockholders, participating securities are allocated earnings based on actual dividend distributions received plus a proportionate share of undistributed net income attributable to common stockholders, if any, after recognizing distributed earnings. The Company's participating securities do not participate in undistributed net losses because they are not contractually obligated to do so. The computation of diluted net income (loss) per share attributable to common stockholders reflects the potential dilution that could occur if securities or other contracts to issue common stock that are dilutive 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. During periods in which the Company realizes a loss from continuing operations attributable to common stockholders, securities or other contracts to issue common stock would not be dilutive to net loss per share and conversion into common stock is assumed not to occur. Diluted net income (loss) per share is calculated under both the two-class method and the treasury stock method and the more dilutive of the two calculations is presented.
The Company's basic net income (loss) per share attributable to common stockholders is computed as (i) net income (loss) attributable to common stockholders, (ii) less participating share- and unit-based basic earnings (iii) divided by weighted average basic shares outstanding. The Company's diluted net income (loss) per share attributable to common stockholders is computed as (i) basic net income (loss) attributable to common stockholders, (ii) plus diluted adjustments to participating undistributed earnings (iii) divided by weighted average diluted shares outstanding.
The following table is a reconciliation of the Company's Diluted net income (loss) per share attributable to common stockholders tois calculated under both the two-class method and the treasury stock method and the more dilutive of the two calculations is presented.
The components of basic and diluted net income (loss) per share attributable to common stockholders forare as follows:
Year Ended December 31,
 202020192018
 (in millions)
Net income (loss) attributable to common stockholders$(200)$773 $978 
Participating share based earnings (a)(3)(5)
Basic and diluted net income (loss) attributable to common stockholders$(200)$770 $973 
Basic and diluted weighted average shares outstanding165167171
______________________
(a)Unvested restricted stock awards represent participating securities because they participate in nonforfeitable dividends with the years endedcommon equity owners of the Company. Participating share- or unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards do not participate in undistributed net losses as they are not contractually obligated to do so.
Stock repurchase program. In December 31, 2017, 2016 and 2015:2018, the Company's board of directors authorized a common stock repurchase program that allows the Company to repurchase up to $2 billion of its common stock. Under this stock repurchase program, the Company may repurchase shares from time to time at management's discretion in accordance with applicable securities laws. In addition, the Company may repurchase shares pursuant to a trading plan meeting the requirements of Rule 10b5-1 under the Securities Act of 1934, which would permit the Company to repurchase shares at times that may otherwise be prohibited under the Company's insider trading policy. The stock repurchase program has no time limit, may be modified, suspended or terminated at any time by the board of directors.
 Year Ended December 31,
 2017 2016 2015
 (in millions)
Income (loss) from continuing operations$833
 $(556) $(266)
Participating basic earnings (a)(6) 
 
Basic and diluted net income (loss) from continuing operations827
 (556) (266)
Basic and diluted net loss from discontinued operations
 
 (7)
Basic and diluted net income (loss) attributable to common stockholders$827
 $(556) $(273)
______________________
(a)Unvested restricted stock awards represent participating securities because they participate in nonforfeitable dividends with the common equity owners of the Company. Participating share- or unit-based earnings represent the distributed and undistributed earnings of the Company attributable to the participating securities. Unvested restricted stock awards do not participate in undistributed net losses as they are not contractually obligated to do so.
Basic and diluted weighted average common shares outstanding were 170 million, 166 million and 149 million for the years ended December 31, 2017, 2016 and 2015, respectively.Shares repurchased are as follows:
Year Ended December 31,
202020192018 (a)
(in millions)
Shares repurchased$160 $622 $149 
NOTE Q.    Subsequent Events______________________
In February(a)During 2018, the Company announced its intentionrepurchased $22 million of common stock pursuant to divest its properties in South Texas, Ratona previously authorized common stock repurchase program and $127 million of common stock pursuant to the West Panhandle field and focus its efforts and capital resourcescurrent authorized common stock repurchase program.
As of December 31, 2020, $1.1 billion remains available for use to its Permian Basin assets. No assurance can be given that the sales will be completed in accordance withrepurchase shares under the Company's plans or on termscommon stock repurchase program.
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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and at prices acceptable to the Company.2018
NOTE 19. Subsequent Events
Dividends.In February 2018,2021, the Board (i)board of directors declared a cash dividend of $0.16$0.56 per share on Pioneer’sthe Company's outstanding common stock, payable April 12, 201814, 2021 to stockholders of record at the close of business on March 29, 201831, 2021.
Parsley Energy Acquisition.On January 12, 2021, the Company acquired Parsley Energy, Inc., a Delaware corporation that previously traded on the NYSE under the symbol "PE" ("Parsley"), pursuant to the Agreement and Plan of Merger, dated as of October 20, 2020, among Pioneer, certain of its subsidiaries, Parsley and Parsley's subsidiary, Parsley Energy, LLC (the "Parsley Acquisition"). On the closing date of the Parsley Acquisition, Parsley merged into a newly formed wholly owned subsidiary of the Company, and the subsidiaries of Parsley, including Jagged Peak Energy LLC ("Jagged Peak"), became indirect subsidiaries of the Company.
As part of the Parsley Acquisition, each eligible share of Parsley Class A common stock and each membership interest unit of Parsley Energy, LLC were automatically converted into the right to receive .1252 shares of Pioneer common stock. As a result, the Company issued approximately 52 million shares of Pioneer common stock upon the consummation of the Parsley Acquisition, representing total stock consideration transferred of approximately $7 billion.
Acquisition costs of $10 million related to the Parsley Acquisition are included in other expense in the Company's consolidated statements of operations for the year ended December 31, 2020. The acquisition will be accounted for as a business combination, with the fair value of consideration allocated to the acquisition date fair value of assets and liabilities acquired. Parsley's post-acquisition date results of operations will be incorporated into the Company's interim condensed consolidated financial statements for the three months ended March 31, 2021.
Parsley is considered a related party as Bryan Sheffield, Parsley's Executive Chairman and one of Parsley's largest stockholders, is the son of Scott Sheffield, Chief Executive Officer of the Company.
First Amendment to Credit Agreement. On January 12, 2021, Pioneer entered into the First Amendment to Credit Agreement (the "Amendment") with Wells Fargo Bank, National Association, as Administrative Agent, and the other agents and lenders party thereto. The primary changes attributable to the Amendment were to increase the aggregate loan commitments from $1.5 billion to $2.0 billion, extend the maturity of the credit facility to January 12, 2026 and to nominally adjust the drawn and undrawn pricing.
Senior notes.On December 30, 2020, Parsley and the other issuers of their senior notes delivered notices of conditional redemption for the Parsley 5.250% Senior Notes due 2025 and the Parsley 5.375% Senior Notes due 2025. Additionally, Pioneer issued a cash tender offer notice to purchase any and all of the Parsley outstanding 5.625% Senior Notes due 2027 and 4.125% Senior Notes due 2028. On January 14, 2021, Pioneer delivered an additional conditional notice of redemption for the Jagged Peak 5.875% Senior Notes due 2026.
In January 2021, the Company issued $750 million of 0.750% Senior Notes that will mature January 15, 2024, $750 million of 1.125% Senior Notes that will mature January 15, 2026 and $1.0 billion of 2.150% Senior Notes that will mature January 15, 2031 (the "January 2021 Senior Notes Offering"). The Company received proceeds, net of $18 million of issuance costs and discounts, of $2.5 billion. Interest on each of the new notes will be payable on January 15 and July 15 of each year. The senior notes are unsecured obligations ranking equally in right of payment with all other senior unsecured indebtedness of the Company.
The Company used the proceeds from the January 2021 Senior Notes Offering to (i) pay $1.6 billion to redeem Parsley's 5.250% Senior Notes due 2025, Parsley's 5.375% Senior Notes due 2025 and Jagged Peak's 5.875% Senior Notes due 2026, and (ii) approvedpay $852 million to purchase a common stock repurchase programportion of Parsley's 5.625% Senior Notes due 2027 and Parsley's 4.125% Senior Notes due 2028 pursuant to offseta cash tender offer. In connection with the impacttender offers, the Company also obtained the requisite consents from holders of dilution associatedParsley's 5.625% Senior Notes due 2027 and 4.125% Senior Notes due 2028 to amend the indentures pursuant to which the notes were issued to, among other things, (i) eliminate substantially all of the restrictive covenants and related provisions and certain events of default contained in each indenture and (ii) shorten the minimum notice requirement for optional redemptions to three days.
The Company's outstanding 3.45% Senior Notes matured on January 15, 2021. The Company funded the payment of the $140 million principal balance with annual employee stock awards. The stock repurchase program allowscash on hand. See Note 7 for up to $100 million of common stock to be repurchased during 2018.additional information regarding the Company's 3.45% Senior Notes.



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PIONEER NATURAL RESOURCES COMPANY

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
December 31, 2020, 2019 and 2018
February 2021 Winter Storm.During February 2021, the Company's operations in West Texas were significantly impacted by winter weather that brought abnormally cold temperatures, along with snow and icy conditions across the state of Texas. The extreme winter weather impacted production operations, midstream infrastructure and power providers throughout the state, along with many other services. As a result, most of the Company's production was offline for about a week, which is expected to impact first quarter 2021 production by approximately 30 MBOPD and 55 MBOEPD.
Early in the weather event, the Company attempted to perform or otherwise satisfy its firm gas sales commitments, but as the impacts of the winter weather became clearer, the Company subsequently issued force majeure notices to its customers given the inability to perform such contracts for a variety of reasons, including significant production being offline, interruptions to midstream operations, the inability to flow gas to markets due to infrastructure downtime and compliance with government orders to direct any available gas volumes towards supporting power generation. Certain of the Company's customers have alleged that the Company's force majeure notices were improper under the applicable contracts. The Company estimates that it incurred incremental cash costs of $75 million to $85 million in connection with its firm gas sales commitments early in the weather event.
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PIONEER NATURAL RESOURCES COMPANY
UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 20162020, 2019 and 20152018



Oil & Gas Exploration and Production Activities
The Company has only one reportable operating segment, which is oil and gas development, exploration and production in the United States.U.S. See the Company's accompanying consolidated statements of operations for information about results of operations for oil and gas producing activities.
Capitalized Costs
 December 31,
 20202019
 (in millions)
Oil and gas properties:
Proved$23,934 $22,444 
Unproved576 584 
Capitalized costs for oil and gas properties24,510 23,028 
Less accumulated depletion, depreciation and amortization(10,071)(8,583)
Net capitalized costs for oil and gas properties$14,439 $14,445 
 December 31,
 2017 2016
 (in millions)
Oil and gas properties:   
Proved$20,404
 $18,566
Unproved558
 486
Capitalized costs for oil and gas properties20,962
 19,052
Less accumulated depletion, depreciation and amortization(9,196) (8,211)
Net capitalized costs for oil and gas properties$11,766
 $10,841
Costs Incurred for Oil and Gas Producing Activities
 Year Ended December 31,
 202020192018
 (in millions)
Property acquisition costs:
Proved$— $$
Unproved14 26 64 
Exploration costs (a)1,172 2,199 2,654 
Development costs (b)387 743 949 
Total costs incurred$1,573 $2,970 $3,668 
____________________
(a) Exploration costs incurred for oil and gas production activities includes $5 million, $10 million and $1 million related to asset retirement obligations for the year ended December 31, 2020, 2019 and 2018, respectively.
(b) Development costs incurred for oil and gas producing activities includes the following amounts:

 Year Ended December 31,
 202020192018
 (in millions)
Development drilling$118 $197 $376 
Gas plant expansion (a)17 147 
Production facilities (b)79 140 214 
Asset retirement obligations107 75 16 
Other (c)66 184 334 
Total development costs incurred$387 $743 $949 
____________________
(a) Primarily represents gas plant capital related to the Company's ownership share of expansion capital in gas plants and related infrastructure. See Note 2 for additional information.
(b) Primarily represents production facilities including tank batteries, flowlines and pipeline connections that were associated with development wells and successful exploratory/extension wells placed on production.
(c) Primarily represents (i) capital related non-operated well activity, (ii) labor costs associated with the Company's capital program and (iii) capital workovers performed during the year.
  Year Ended December 31,
  2017 2016 2015
 (in millions)
Property acquisition costs:      
Proved $8
 $78
 $9
Unproved 128
 368
 27
Exploration costs 2,033
 1,454
 1,245
Development costs 628
 509
 894
Total costs incurred $2,797
 $2,409
 $2,175
114
____________________
(a)The costs incurred for oil and gas producing activities includes the following amounts related to asset retirement obligations:

 Year Ended December 31,
 2017 2016 2015
 (in millions)
Proved property acquisition costs$
 $2
 $
Exploration costs2
 2
 2
Development costs(19) 17
 100
Total$(17) $21
 $102
PIONEER NATURAL RESOURCES COMPANY
UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2020, 2019 and 2018
Reserve Quantity Information
The estimates of the Company's proved reserves as of December 31, 2017, 20162020, 2019 and 20152018 were based on evaluations prepared by the Company's engineers and audited by independent petroleum engineers with respect to the Company's major properties and prepared by the Company's engineers with respect to all other properties. Proved reserves were estimated in accordance with guidelines established by the United StatesU.S. Securities and Exchange Commission (the "SEC") and the FASB, which require that reserve estimates be prepared under existing economic and operating conditions based upon an average of the first-day-of-the-month commodity price during the 12-month period ending on the balance sheet date with no provision for price and cost escalations except by contractual arrangements.
Proved reserve quantity estimates are subject to numerous uncertainties inherent in the estimation of quantities of proved reserves and in the projection of future rates of production and the timing of development expenditures. The accuracy of such estimates is a function of the quality of available data and of engineering and geological interpretation and judgment. Results of subsequent drilling, testing and production may cause either upward or downward revision of previous estimates. Further, the

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UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 2016 and 2015



volumes considered to be commercially recoverable fluctuate with changes in commodity prices and operating costs. The Company emphasizes that proved reserve estimates are inherently imprecise and that estimates of new discoveries are more imprecise than those of currently producing oil and gas properties. Accordingly, these estimates are expected to change as additional information becomes available in the future.

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PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 20162020, 2019 and 20152018



The following table provides a rollforward of total proved reserves for the years ended December 31, 2017, 2016 and 2015.reserves. Oil and NGL volumes are expressed in thousands of Bbls ("MBbls"), gas volumes are expressed in millions of cubic feet ("MMcf") and total volumes are expressed in thousands of barrels of oil equivalent ("MBOE").
 Year Ended December 31,
 202020192018
 Oil
(MBbls)
NGLs
(MBbls)
Gas
(MMcf) (a)
Total
(MBOE)
Oil
(MBbls)
NGLs
(MBbls)
Gas
(MMcf) (a)
Total
(MBOE)
Oil
(MBbls)
NGLs
(MBbls)
Gas
(MMcf) (a)
Total
(MBOE)
Total Proved Reserves:
Balance, January 1603,750 281,983 1,499,513 1,135,652 565,010 240,914 1,458,574 1,049,020 482,889 210,497 1,751,880 985,366 
Production (b)(77,095)(31,376)(166,863)(136,282)(77,509)(26,398)(145,026)(128,078)(69,583)(23,280)(157,278)(119,076)
Revisions of previous estimates(68,300)73,107 342,720 61,927 (30,216)29,415 94,767 14,994 (15,665)21,087 257,502 48,339 
Extensions and discoveries111,239 55,952 267,497 211,774 167,022 60,069 293,507 276,009 175,067 51,414 230,272 264,859 
Sales of minerals-in-place(1,480)(803)(4,434)(3,022)(20,603)(22,032)(202,401)(76,369)(7,722)(18,809)(623,830)(130,502)
Purchases of minerals-in-place670 324 1,667 1,272 46 15 92 76 24 28 34 
Balance, December 31568,784 379,187 1,940,100 1,271,321 603,750 281,983 1,499,513 1,135,652 565,010 240,914 1,458,574 1,049,020 
Proved Developed Reserves:
Balance, January 1571,293 268,468 1,429,417 1,077,997 521,579 219,730 1,330,852 963,118 442,364 189,434 1,629,451 903,373 
Balance, December 31539,320 362,584 1,855,607 1,211,172 571,293 268,468 1,429,417 1,077,997 521,579 219,730 1,330,852 963,118 
Proved Undeveloped Reserves:
Balance, January 132,457 13,515 70,096 57,655 43,431 21,184 127,722 85,902 40,525 21,063 122,429 81,993 
Balance, December 3129,464 16,603 84,493 60,149 32,457 13,515 70,096 57,655 43,431 21,184 127,722 85,902 
 Year Ended December 31,
 2017 2016 2015
 Oil
(MBbls)
 NGLs
(MBbls)
 Gas
(MMcf) (a)
 
Total
(MBOE)
 Oil
(MBbls)
 NGLs
(MBbls)
 Gas
(MMcf) (a)
 
Total
(MBOE)
 Oil
(MBbls)
 NGLs
(MBbls)
 Gas
(MMcf) (a)
 
Total
(MBOE)
Balance, January 1378,196
 136,941
 1,264,729
 725,925
 311,970
 126,344
 1,356,487
 664,395
 352,084
 169,244
 1,668,872
 799,473
Production (b)(57,878) (20,078) (143,464) (101,867) (48,926) (15,922) (139,510) (88,100) (38,452) (14,086) (147,173) (77,067)
Revisions of previous estimates20,140
 44,995
 365,275
 126,015
 (3,912) 1,279
 (76,998) (15,466) (82,816) (54,439) (309,947) (188,913)
Extensions and discoveries146,822
 49,378
 266,347
 240,591
 117,406
 24,735
 120,766
 162,269
 80,726
 25,496
 143,991
 130,221
Sales of minerals-in-place(4,899) (918) (4,898) (6,633) (908) (238) (1,377) (1,376) (16) (3) (15) (21)
Purchases of minerals-in-place508
 179
 3,891
 1,335
 2,566
 743
 5,361
 4,203
 444
 132
 759
 702
Balance, December 31482,889
 210,497
 1,751,880
 985,366
 378,196
 136,941
 1,264,729
 725,925
 311,970
 126,344
 1,356,487
 664,395
______________________
______________________
(a)
(a)The proved gas reserves as of December 31, 2017, 2016 and 2015 include 171,623 MMcf, 137,853 MMcf and 144,955 MMcf, respectively, of gas that the Company expected to be produced and utilized as field fuel. Field fuel is gas consumed to operate field equipment (primarily compressors) rather than being delivered to a sales point.
(b)Production for 2017, 2016 and 2015 includes 14,799 MMcf, 15,082 MMcf and 15,531 MMcf of field fuel, respectively.

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UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 20162020, 2019 and 20152018 include 115,239 MMcf, 100,236 MMcf and 106,948 MMcf, respectively, of gas that the Company expected to be produced and utilized as field fuel. Field fuel is gas consumed to operate field equipment (primarily compressors) rather than being delivered to a sales point.

(b)Production for 2020, 2019 and 2018 includes 11,201 MMcf, 11,781 MMcf and 13,690 MMcf of field fuel, respectively.



Revisions of previous estimates. Revisions of previous estimates for 20172020, 2019 and 2018 were comprised of 52145 million barrels of oil equivalent ("MMBOE"), 26 MMBOE and 29 MMBOE, respectively, of positive price revisions due to 20 percent increases in both the NYMEX oil and NYMEX gas prices that were used to determine proved oil and gas reserves for 2017, as compared to 2016, in addition to 74technical revisions. The 145 MMBOE of positive technical revisions thatin 2020 were primarily attributable to 167 MMBOE of positive NGLs and gas revisions as a result of (i) increasing wet gas production (as a percentage of a horizontal well's total production) over time, (ii) new processing facilities and takeaway capacity being placed into service during 2019 and 2020, which had the effect of lowering line pressures, and (iii) increased recovery rates for NGLs. The positive technical revisions for 2019 and 2018 were primarily attributable to improved performance from horizontal wells placed on production in the Spraberry/Wolfcamp prioroil field in the Permian Basin. Revisions of previous estimates associated with changes in NYMEX oil and gas prices resulted in negative price revisions of 83 MMBOE and 11 MMBOE in 2020 and 2019, respectively, and positive price revisions of 20 MMBOE in 2018. Of the negative price revisions for 2020, 46 MMBOE were attributable to 2017 and, to a lesser extent, reductions in costs (based on the Company's cost reduction initiatives during 2017) that had the effectproved oil reductions.
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PIONEER NATURAL RESOURCES COMPANY
UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 20172020, 2019 and 2018
The NYMEX priceprices used for oil and gas reserve preparation, based upon SEC guidelines, was $51.34 per barrel of oil and $2.98 per Mcf of gas, compared to $42.82 per barrel of oil and $2.48 per Mcf of gas at December 31, 2016.were as follows:
Revisions of previous estimates for 2016 were comprised of 58 million barrels of oil equivalent of negative price revisions due to 15 percent and four percent declines in the NYMEX oil and gas prices, respectively, that were used to determine proved oil and gas reserves for 2016, as compared to 2015, partially offset by 43 MMBOE of positive revisions that were primarily attributable to reductions in cost estimates (based on cost savings achieved during 2016) that had the effect of extending the economic lives of the Company's producing wells. The December 31, 2016 NYMEX price used for oil and gas reserve preparation based upon SEC guidelines was $42.82 per barrel of oil and $2.48 per Mcf of gas, compared to $50.11 per barrel of oil and $2.59 per Mcf of gas at December 31, 2015.
Year Ended December 31,% Change
20202019201820172020 to 20192019 to 2018 2018 to 2017
Oil per Bbl$39.57 $55.93 $65.57 $51.34 (29%)(15%)28%
Gas per Mcf$1.98 $2.58 $3.10 $2.98 (23%)(17%)4%
Revisions of previous estimates for 2015 were comprised of 269 MMBOE of negative price revisions due to 47 percent and 40 percent declines in the NYMEX oil and gas prices, respectively, that were used to determine proved oil and gas reserves for 2015, as compared to 2014, partially offset by 80 MMBOE of positive revisions that were primarily attributable to reductions in cost estimates (based on cost savings achieved during 2015) that had the effect of extending the economic lives of the Company's producing wells. The December 31, 2015 NYMEX price used for oil and gas reserve preparation based upon SEC guidelines was $50.11 per barrel of oil and $2.59 per Mcf of gas, compared to $94.98 per barrel of oil and $4.35 per Mcf of gas at December 31, 2014.
Extensions and discoveries. Extensions and discoveries for 2017, 20162020, 2019 and 20152018 were primarily comprised of proved reserve additions attributable to the Company's successful horizontal drilling program in the Spraberry/Wolfcamp oil field in the Permian Basin. During 2020, 2019 and Eagle Ford Shale areas.2018, the Company drilled 242, 280 and 251 gross productive exploratory/extension wells, respectively, and added 28, 41 and 24 of proved undeveloped locations, respectively. Associated therewith, during 2020, 2019 and 2018, the Company added 212 MMBOE, 276 MMBOE and 265 MMBOE of net reserves from extensions and discoveries, respectively, of which 29 MMBOE, 36 MMBOE and 23 MMBOE, respectively, were recorded as proved undeveloped reserves. The Permian Basin's geology is complex, consisting of multiple stacked horizons/zones, each with its own unique characteristics. The Company recognizes proved undeveloped reserves on undrilled acreage directly offsetting development areas that are reasonably certain of production when drilled, or when reliable technology provides reasonable certainty of economic producibility. The Company did not add any proved undeveloped reserves using reliable technology during the years 2018 - 2020.
Sales of minerals-in-place. Sales of minerals-in-place in 20172020 were primarily related to divesting non-core Permian Basin unproved properties and associated producing wells. In 2019, sales of minerals-in-place were primarily related to the sale of approximately 20,500 acres in the Martin County regionCompany's Eagle Ford assets and other remaining South Texas assets. In 2018, sales of minerals-in-place were primarily related to the sale of the Permian Basin.Company's West Eagle Ford Shale assets, Raton Basin assets and West Panhandle assets. See Note C3 to the accompanying financial statements for additional information regarding the Company's divestitures and discontinued operations.information.
Purchases of minerals-in-place. Purchases of minerals-in-place during 2017, 2016 and 20152020 were primarily attributable to acquisitions in the Company's Spraberry/Wolfcamp area.

oil field in the Permian Basin.
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PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 20162020, 2019 and 2015


2018

The following table provides the Company's proved developed and proved undeveloped reserves for the years ended December 31, 2017, 2016 and 2015.
 Oil
(MBbls)
 NGLs
(MBbls)
 Gas
(MMcf)
 
Total
(MBOE)
Proved Developed Reserves:       
December 31, 2017442,364
 189,434
 1,629,451
 903,373
December 31, 2016343,515
 126,928
 1,215,861
 673,085
December 31, 2015266,657
 112,376
 1,284,680
 593,146
Proved Undeveloped Reserves:       
December 31, 201740,525
 21,063
 122,429
 81,993
December 31, 201634,681
 10,013
 48,868
 52,840
December 31, 201545,313
 13,968
 71,807
 71,249
The following table summarizes the Company's provedProved undeveloped reserves activity during the year ended December 31, 2017is as follows (in MBOE).        
:    
Year Ended December 31, 2020
Beginning proved undeveloped reserves52,84057,655 
Revisions of previous estimates(7,343(1,190))
Extensions and discoveries51,60928,763 
Transfers to proved developed(15,113(25,079))
Ending proved undeveloped reserves81,99360,149 
As of December 31, 2017,2020, the Company had 13460 proved undeveloped well locations as compared to 9060 and 138 at134 for December 31, 20162019 and 2015,December 31, 2018, respectively. The Company has no proved undeveloped well locations that are scheduled to be drilled more than five years from their original date of booking.
The changes in proved undeveloped reserves during 20172020 were comprised of the following items:
Revisions of previous estimates. Revisions of previous estimates were primarily comprised of 7one MMBOE of negative revisions that were related to proved undeveloped reserves that were replaced based on the Company's successful 2017 drilling program.negative technical revisions.
Extensions and discoveries. Extensions and discoveries were primarily comprised of proved reserve additions attributable to the Company's successful horizontal drilling program in the Spraberry/Wolfcamp area.oil field in the Permian Basin.
Transfers to proved developed. Transfers to proved developed reserves represented those undeveloped proved reserves that moved to proved developed as a result of development drilling. During 2017, the CompanyThe company incurred $628 million of development costs directly related to the transfer of proved reserves of approximately $166 million, or $6.62 per BOE, and developed 2943 percent of its 2019 proved undeveloped reserves. Development costs related to the transfer of proved reserves were incurred during 2019 and 2020.
The Company uses both public and proprietary geologic data to establish continuity of the formation and its producing properties. This included seismic data and interpretations (2-D, 3-D and micro seismic); open hole log information (both vertical and horizontally collected) and petrophysical analysis of the log data; mud logs; gas sample analysis; drill cutting samples; measurements of total organic content; thermal maturity; sidewall cores and data measured from the Company's internal core analysis facility. After the geologic area was shown to be continuous, statistical analysis of existing producing wells was conducted to generate areas of reasonable certainty at distances from established production. As a result of this analysis, proved undeveloped reserves for drilling locations within these areas of reasonable certainty were recorded during 2017.

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UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 2016 and 2015



2020.
While the Company expects, based on Management's Price Outlooks, that future operating cash flows will provide adequate funding for future development of its proved undeveloped reserves over the next five years, it may also use any combination of internally-generated cash flows, cash and cash equivalents on hand, sales of short-term and long-term investments, availability under its credit facility, proceeds from divestitures of nonstrategic assets or external financing sources to fund these and other capital expenditures, including exploratoryexploratory/extension drilling and acquisitions.
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PIONEER NATURAL RESOURCES COMPANY
UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2020, 2019 and 2018
The following table represents the estimated timing and cash flows of developing proved undeveloped reserves are as follows:
As of December 31, 2020
Estimated
Future
Production
(MBOE)
Future Cash
Inflows
Future
Production
Costs
Future
Development
Costs
Future Net
Cash Flows
(in millions)
Year Ended December 31, (a)
20213,550 $108 $18 $203 $(113)
20225,616 160 31 92 37 
20235,121 137 30 39 68 
20244,708 122 28 59 35 
20254,186 107 26 78 
Thereafter (b)36,968 883 329 549 
Total60,149 $1,517 $462 $401 $654 
______________________ 
(a)Production and cash flows represent the drilling results from the respective year plus the incremental effects of proved undeveloped drilling beginning in 2021.
(b)Future development costs represents $5 million of net abandonment costs in years beyond the forecasted years.
The Company's 2020 estimated future production costs attributable to proved undeveloped reserves of $7.68 per BOE are less than the forecasted future production costs attributable to total proved reserves of $11.63 per BOE for the following reasons:
As of December 31, 2020, the majority of the Company's proved developed producing wells are comprised of legacy vertical wells that have higher production costs, on a per BOE basis, than the Company's proved developed producing horizontal wells. The total proved reserves production cost per BOE of $11.63 is comprised of $10.14 per BOE for horizontal wells and $23.57 per BOE for vertical wells.
The estimated future production costs of $7.68 per BOE associated with proved undeveloped reserves asis comprised entirely of December 31, 2017 (dollarshorizontal wells is marginally lower than the $10.14 per BOE average of the Company's producing horizontal wells included in millions):total proved reserves. The lower costs take into account the initial production rates of new wells, which are higher at the beginning of a well's life, and result in a lower overall production cost, on a per BOE basis, when looked at over the well's total productive life versus a well that is later in its productive life. In addition, the future production costs on proved undeveloped horizontal wells also reflect the economies of scale of adding the wells to existing infrastructure, allowing the Company to spread certain fixed costs over a larger production volume.


Year Ended December 31, (a)
Estimated
Future
Production
(MBOE)
 
Future Cash
Inflows
 
Future
Production
Costs
 
Future
Development
Costs
 
Future Net
Cash Flows
20183,065
 $111
 $19
 $231
 $(139)
20198,597
 281
 58
 215
 8
20209,873
 327
 64
 151
 112
20218,258
 262
 56
 67
 139
20227,931
 242
 57
 77
 108
Thereafter (b)44,269
 1,462
 356
 11
 1,095
 81,993
 $2,685
 $610
 $752
 $1,323
119
______________________ 
(a)Production and cash flows represent the drilling results from the respective year plus the incremental effects of proved undeveloped drilling beginning in 2018.
(b)The $11 million of future development costs represents net abandonment costs in years beyond the forecasted years.

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PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 20162020, 2019 and 2015


2018

Standardized Measure of Discounted Future Net Cash Flows
The standardized measure of discounted future net cash flows is computed by applying commodity prices used in determining proved reserves (with consideration of price changes only to the extent provided by contractual arrangements) to the estimated future production of proved reserves less estimated future expenditures (based on year-end estimated costs) to be incurred in developing and producing the proved reserves, discounted using a rate of ten percent per year to reflect the estimated timing of the future cash flows. Future income taxes are calculated by comparing undiscounted future cash flows to the tax basis of oil and gas properties plus available carryforwards and credits and applying the current tax rates to the difference. The discounted future cash flow estimates do not include the effects of the Company's commodity derivative contracts.
Discounted future cash flow estimates like those shown below are not intended to represent estimates of the fair value of oil and gas properties. Estimates of fair value should also consider probable and possible reserves, anticipated future commodity prices, interest rates, changes in development and production costs and risks associated with future production. Because of these and other considerations, any estimate of fair value is necessarily subjective and imprecise.
The following tables provide the standardized measure of discounted future cash flows as of December 31, 2017, 2016 and 2015, as well as a rollforward in total for each respective year:year are as follows:
 December 31,
 202020192018
(in millions)
Oil and gas producing activities:
Future cash inflows$30,357 $40,902 $43,057 
Future production costs(14,784)(19,687)(16,800)
Future development costs (a)(1,124)(1,858)(1,613)
Future income tax expense(494)(1,096)(1,461)
Standardized measure of future cash flows13,955 18,261 23,183 
Ten percent annual discount factor(6,753)(8,527)(11,850)
Standardized measure of discounted future cash flows$7,202 $9,734 $11,333 
 __________________
(a)Includes $595 million, $584 million and $621 million of undiscounted future asset retirement expenditures estimated as of December 31, 2020, 2019 and 2018, respectively, using current estimates of future abandonment costs at the end of each year. See Note 9 for additional information.
 December 31,
 2017 2016 2015
 (in millions)
Oil and gas producing activities:     
Future cash inflows$31,716
 $19,313
 $18,805
Future production costs(13,304) (10,462) (11,475)
Future development costs (a)(1,532) (1,189) (1,622)
Future income tax expense(725) (55) 
 16,155
 7,607
 5,708
10% annual discount factor(8,004) (3,417) (2,464)
Standardized measure of discounted future cash flows$8,151
 $4,190
 $3,244
120
 __________________
(a)Includes $639 million, $603 million and $604 million of undiscounted future asset retirement expenditures estimated as of December 31, 2017, 2016 and 2015, respectively, using current estimates of future abandonment costs. See Note I for additional information regarding the Company's discounted asset retirement obligations.

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PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 20162020, 2019 and 2015


2018

Changes in Standardized Measure of Discounted Future Net Cash Flows
 Year Ended December 31,
 202020192018
 (in millions)
Oil and gas sales, net of production costs$(2,566)$(3,569)$(3,673)
Revisions of previous estimates:
Net changes in prices and production costs(3,971)(2,935)2,067 
Changes in future development costs152 (454)(299)
Revisions in quantities(27)(174)(283)
Accretion of discount809 985 1,163 
Extensions, discoveries and improved recovery2,366 4,541 5,053 
Development costs incurred during the period105 183 177 
Sales of minerals-in-place(9)(541)(287)
Purchases of minerals-in-place— — 
Change in present value of future net revenues(3,134)(1,964)3,918 
Net change in present value of future income taxes602 365 (736)
(2,532)(1,599)3,182 
Balance, beginning of year9,734 11,333 8,151 
Balance, end of year$7,202 $9,734 $11,333 

 Year Ended December 31,
 2017 2016 2015
 (in millions)
Oil and gas sales, net of production costs$(2,713) $(1,700) $(1,314)
Revisions of previous estimates:     
Net changes in prices and production costs2,690
 (284) (7,960)
Changes in future development costs(130) 39
 1,204
Revisions in quantities1,088
 (122) (1,292)
Accretion of discount770
 552
 1,125
Changes in production rates, timing and other (a)(621) 72
 (93)
Extensions, discoveries and improved recovery3,454
 2,275
 1,597
Development costs incurred during the period139
 142
 308
Sales of minerals-in-place(57) (12) 
Purchases of minerals-in-place10
 39
 13
Change in present value of future net revenues4,630
 1,001
 (6,412)
Net change in present value of future income taxes (b)(669) (55) 1,871
 3,961
 946
 (4,541)
Balance, beginning of year4,190
 3,244
 7,785
Balance, end of year$8,151
 $4,190
 $3,244
121
__________________
(a)The Company's changes in Standardized Measure attributable to production rates, timing and other primarily represent changes in the Company's estimates of when proved reserve quantities will be realized.
(b)Reflects the permanent reduction in the federal corporate income tax rate from 35 percent to 21 percent associated with the enactment of the Tax Cuts and Jobs Act. See Note O for additional information.

114

PIONEER NATURAL RESOURCES COMPANY

UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2017, 20162020, 2019 and 2015


2018

Selected Quarterly Financial Results
In the fourth quarter of 2020, the Company determined that certain amounts reported in the Company's previously issued unaudited interim consolidated statements of operations and consolidated balance sheets contained misstatements (see Note 2 for further details). In accordance with Staff Accounting Bulletin No. 99, Materiality, management evaluated the materiality of the misstatements from a qualitative and quantitative perspective and concluded that the misstatements were not material to the Company's previously issued first and second quarter 2020 interim consolidated financial statements. The following table provides selectedCompany concluded that the misstatements were material to the three and nine months ended September 30, 2020 interim consolidated financial statements. Accordingly, the Company has revised its first and second quarter 2020 interim consolidated financial statements and has restated its three and nine months ended September 30, 2020 interim consolidated financial statements.
The effects of the adjustments to the Company's previously reported 2020 quarterly financial resultsconsolidated statements of operations on a standalone quarter basis is as follows (in millions, except for per share data):
As ReportedAdjustmentsAs RevisedAs Restated
First QuarterSecond QuarterThird QuarterFirst QuarterSecond QuarterThird QuarterFirst QuarterSecond QuarterThird QuarterFourth Quarter
Oil and gas revenues$1,095 $600 $922 $— $— $— $1,095 $600 $922 $1,013 
Derivative gain (loss), net (a) (b)$453 $(336)$(57)$$(20)$(84)$456 $(356)$(141)$(240)
Total revenues and other income$2,257 $859 $1,815 $$(20)$(84)$2,260 $839 $1,731 $1,856 
Total costs and expenses1,892 1,397 1,831 — — — 1,892 1,397 1,831 1,828 
Income (loss) before income taxes365 (538)(16)(20)(84)368 (558)(100)28 
Income tax benefit (provision)(76)99 (4)(1)10 19 (77)109 15 15 
Net income (loss)$289 $(439)$(20)$$(10)$(65)$291 $(449)$(85)$43 
Basic and diluted net income (loss) attributable to common stockholders per share$1.74 $(2.66)$(0.12)$0.01 $(0.07)$(0.40)$1.75 $(2.73)$(0.52)$0.26 

122


PIONEER NATURAL RESOURCES COMPANY
UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2020, 2019 and 2018
The effects of the adjustments to the Company's previously reported 2020 quarterly consolidated statements of operations on a year-to-date basis is as follows (in millions, except for per share data):
As ReportedAdjustmentsAs RevisedAs Restated
First QuarterSecond QuarterThird QuarterFirst QuarterSecond QuarterThird QuarterFirst QuarterSecond QuarterThird Quarter
Oil and gas revenues$1,095 $1,695 $2,617 $— $— $— $1,095 $1,695 $2,617 
Derivative gain (loss), net (a) (b)$453 $117 $60 $$(17)$(101)$456 $100 $(41)
Total revenues and other income$2,257 $3,116 $4,930 $$(17)$(101)$2,260 $3,099 $4,829 
Total costs and expenses1,892 3,288 5,118 — — — 1,892 3,288 5,118 
Income (loss) before income taxes365 (172)(188)(17)(101)368 (189)(289)
Income tax benefit (provision)(76)22 18 (1)28 (77)31 46 
Net income (loss)$289 $(150)$(170)$$(8)$(73)$291 $(158)$(243)
Basic and diluted net income (loss) attributable to common stockholders per share$1.74 $(0.91)$(1.03)$0.01 $(0.05)$(0.44)$1.75 $(0.96)$(1.47)
______________
(a)During the Company's review of its marketing contracts during the fourth quarter of 2020, the Company identified two long-term marketing contracts that should have been accounted for as derivative contracts. The contracts were entered in October 2019, each with January 1, 2021 contract commencement date and a December 31, 2026 contract termination date. The effect of the misstatements was an understatement of noncash derivative gains of $6 million for the yearsquarter ended March 31, 2020, an overstatement of noncash derivative losses of $22 million for the quarter ended June 30, 2020 and an overstatement of noncash derivative gains of $85 million for the quarter ended September 30, 2020.
(b)During the fourth quarter of 2020, the Company also made certain other immaterial corrections to previously reported quarters. The Company determined that no adjustments were needed for interim periods prior to March 31, 2020.

123


PIONEER NATURAL RESOURCES COMPANY
UNAUDITED SUPPLEMENTARY INFORMATION
December 31, 2020, 2019 and 2018
The effects of the adjustments to the Company's previously reported 2020 quarterly consolidated balance sheets is as follows (in millions, except for per share data):
As ReportedAdjustmentsAs RevisedAs Restated
First QuarterSecond QuarterThird QuarterFirst QuarterSecond QuarterThird QuarterFirst QuarterSecond QuarterThird Quarter
Derivative asset - current$386 $72 $49 $— $— $(1)$386 $72 $48 
Total current assets$2,069 $1,195 $2,420 $— $— $(1)$2,069 $1,195 $2,419 
Derivative asset - noncurrent$43 $$— $24 $17 $— $67 $20 $— 
Total assets$19,051 $17,906 $18,977 $24 $17 $(1)$19,075 $17,923 $18,976 
Derivative liability - current$$88 $51 $— $11 $23 $$99 $74 
Total current liabilities$2,080 $1,584 $1,688 $— $11 $23 $2,080 $1,595 $1,711 
Derivative liability - noncurrent$$27 $14 $— $$56 $$28 $70 
Deferred income taxes$1,465 $1,403 $1,406 $$(4)$(24)$1,470 $1,399 $1,382 
Retained earnings$4,223 $3,693 $3,582 $19 $$(56)$4,242 $3,702 $3,526 
Total equity$12,211 $11,740 $11,654 $19 $$(56)$12,230 $11,749 $11,598 
Total liabilities and equity$19,051 $17,906 $18,977 $24 $17 $(1)$19,075 $17,923 $18,976 

The adjustments had no effect on the Company's previously reported interim 2020 net cash flows from operating activities, investing activities or financing activities.
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PIONEER NATURAL RESOURCES COMPANY

ITEM 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
FINANCIAL DISCLOSURE
None.
ITEM 9A.CONTROLS AND PROCEDURES
Background. In connection with the preparation of this Report, management of the Company became aware that the unaudited consolidated financial statements for the three and nine months ended September 30, 2020, contained misstatements related to two long-term marketing contracts that should have been accounted for as derivative contracts. The contracts were executed in October 2019, each with a January 1, 2021 contract commencement date and a December 31, 2026 contract termination date. In order to properly account for the contracts as derivatives, the Company has withdrawn reliance on its previously reported unaudited consolidated financial statements for the three months and nine months ended September 30, 2020 and has restated the unaudited consolidated financial statements for those periods in this Annual Report on Form 10-K. See the Company's Current Report on Form 8-K filed on February 25, 2021 and "Unaudited Supplementary Information" included in "Item 8. Financial Statements and Supplementary Data" of this Report.
Management of the Company has concluded that the control deficiency that resulted in the failure to detect the misstatement described above is a material weakness in the Company's internal control over financial reporting as of December 31, 2020 related to the design and maintenance of internal controls over the review of material marketing contracts that could have elements of a derivative. Management of the Company therefore concluded that the Company's disclosure controls and procedures were not effective at September 30, 2020 or December 31, 2020 and that the Company's internal control over financial reporting was not effective at a reasonable assurances level at December 31, 2020. Other than the material weakness identified above, there were no changes to the Company's internal control over financial reporting (as defined in Rules 13a-15(f) under the Exchange Act) that occurred during the three months ended December 31, 2017 and 2016, with adjustments2020 that have materially affected, or are reasonably likely to conform tomaterially affect, the annual results:Company's internal control over financial reporting.
  Quarter
  First Second Third Fourth
  (in millions, except per share data)
Year Ended December 31, 2017:        
Oil and gas revenues $809
 $768
 $855
 $1,085
Total revenues and other income:        
As reported (a) $1,468
 $1,630
 $1,460
 $1,526
Adjustment for sales of purchased oil and gas (b) (168) (168) (293) 
As adjusted $1,300
 $1,462
 $1,167
 $1,526
Total costs and expenses:        
As reported (c) $1,541
 $1,276
 $1,494
 $1,464
Adjustment for purchased oil and gas (b) (168) (168) (293) 
As adjusted $1,373
 $1,108
 $1,201
 $1,464
Net income (loss) attributable to common stockholders $(42) $233
 $(23) $665
Net income (loss) attributable to common stockholders per share:       

Basic $(0.25) $1.36
 $(0.13) $3.88
Diluted $(0.25) $1.36
 $(0.13) $3.87
Year Ended December 31, 2016:        
Oil and gas revenues $409
 $613
 $643
 $753
Total revenues and other income:        
As reported (a) 685
 786
 1,186
 1,168
Adjustment for sales of purchased oil and gas (b) (60) (115) (129) (140)
As adjusted $625
 $671
 $1,057
 $1,028
Total costs and expenses:        
As reported (c) 1,093
 1,197
 1,242
 1,253
Adjustment for purchased oil and gas (b) (60) (115) (129) (140)
As adjusted $1,033
 $1,082
 $1,113
 $1,113
Net income (loss) attributable to common stockholders $(267) $(268) $22
 $(44)
Net income (loss) attributable to common stockholders per share:        
Basic $(1.65) $(1.63) $0.13
 $(0.26)
Diluted $(1.65) $(1.63) $0.13
 $(0.26)
_____________________
(a)During 2017, the Company's total revenues and other income included net derivative gains of $151 million and $135 million during the first and second quarters, respectively, and net derivative losses of $133 million and $254 million during the third quarter and fourth quarters, respectively. During 2016, the Company's total revenues and other income included net derivative gains of $43 million and $91 million during the first and third quarters, respectively, and net derivative losses of $229 million and $66 million during the second and fourth quarters, respectively.
(b)Represents the revision to present transportation costs associated with purchases and sales of third-party oil and gas on a net basis in purchased oil and gas expense. Previously, these transportation costs were separately stated on a gross basis in sales of purchased oil and gas and purchased oil and gas expense. See Note B for additional information about the revision of the Company's revenues and expenses associated with these transactions.
(c)During the first quarter of 2017, the Company's total costs and expenses included charges of $285 million to impair the carrying value of proved properties in the Raton field. During the first quarter of 2016, the Company's total costs and expenses included charges of $32 million to impair the carrying value of proved properties in the West Panhandle field.

ITEM 9.CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE
None.
ITEM 9A.CONTROLS AND PROCEDURES
Evaluation of disclosure controls and procedures. Disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) are designed to ensure that information required to be disclosed in the reports the Company files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and that such information is accumulated and communicated to the Company's management, including the principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure.
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 effectiveness of 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 Company's disclosure controls and procedures were not effective, as of the end of the period covered by this Report, in ensuring that information required to be disclosed bybecause of the Company inexistence of 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, including that such information is accumulated and communicated to the Company's management, including the principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure.
Changesmaterial weakness in internal control over financial reporting. There have been no changes inreporting described below (which the Company views as an integral part of the Company's internal control over financial reporting (as defined in Rule 13a-15(f) under the Exchange Act) that occurred during the three months ended December 31, 2017 that have materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.disclosure controls and procedures).
MANAGEMENT'S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING
The Company's management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting. The Company's internal control over financial reporting is a process designed by or under the supervision of the Company's principal executive officer and principal financial officer and effected by the Board,board of directors, management and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of the Company's financial statements for external purposes in accordance with generally accepted accounting principles. The Company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that in reasonable detail accurately and fairly reflect the transactions and dispositions of the assets of the Company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles and that receipts and expenditures of the issuer are being made only in accordance with authorizations of management and directors of the issuer; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the Company's assets that could have a material effect on the financial statements.
The Company's management, with the participation of its principal executive officer and principal financial officer assessed the effectiveness, as of December 31, 2017,2020, of the Company's internal control over financial reporting based on the criteria for effective internal control over financial reporting established in "Internal Control — Integrated Framework (2013)," issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on the assessment, management
125

determined that the Company maintained effectiveCompany's internal control over financial reporting was not effective at a reasonable assurance level as of December 31, 2017, based2020 because of the material weakness described below.
Material weakness. A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is reasonable possibility that a material misstatement of the Company's annual or interim consolidated financial statements will not be prevented or detected on those criteria.a timely basis. Management did not design and maintain effective controls to identify and evaluate material marketing contracts that could have elements of a derivative, which failure represents a material weakness in the Company's internal control over financial reporting. This material weakness in the Company's internal control over financial reporting resulted in the accounting corrections that led to the restatement of previously issued financial statements.
Remediation Plan. Management is developing and plans to implement the following internal controls to remediate the control deficiency related to the review of material marketing contracts that could have elements of a derivative:
Implement new controls surrounding the review and identification of unique marketing contract terms that would indicate that the contract may be a derivative, with any identified contract requiring a comprehensive technical accounting assessment and
Engage a third party to review marketing contract terms with unique provisions on an as-required basis.
While management believes that it has implemented the principal remediation measures needed for this material weakness prior to issuance of this Report, including performing a second review of all material third-party marketing contracts, the material weakness will not be considered fully remediated until all aspects of the controls operate for a sufficient period of time to allow management to conclude that these controls are operating effectively. The Company will monitor the effectiveness of its remediation plan and actions and will refine its remediation plan as appropriate.
Ernst & Young LLP, the independent registered public accounting firm that audited the consolidated financial statements of the Company included in this Annual Report on Form 10-K, has issued an attestation report on the effectiveness of the Company's internal control over financial reporting as of December 31, 2017.2020. The report, which expresses an unqualifiedadverse opinion on the effectiveness of the Company's internal control over financial reporting as of December 31, 2017,2020, is included in this Item under the heading "Report of Independent Registered Public Accounting Firm."






126

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
To the Stockholders and the Board of Directors of Pioneer Natural Resources Company
Opinion on Internal Control over Financial Reporting
We have audited Pioneer Natural Resources Company’sCompany's internal control over financial reporting as of December 31, 2017,2020, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Pioneer Natural Resources Company (the Company) has not maintained in all material respects, effective internal control over financial reporting as of December 31, 2017,2020, based on the COSO criteria.
A material weakness is a deficiency, or combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of the company's annual or interim financial statements will not be prevented or detected on a timely basis. The following material weakness has been identified and included in management's assessment. Management did not design and maintain effective controls to identify and evaluate material marketing contracts that could have elements of a derivative.
We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of Pioneer Natural Resources Company as of December 31, 20172020 and 2016, and2019, the related consolidated statements of operations, equity and cash flows for each of the three years in the period ended December 31, 2017,2020, and the related notesnotes. This material weakness was considered in determining the nature, timing and extent of audit tests applied in our audit of the 2020 consolidated financial statements, and this report does not affect our report dated February 20, 2018March 1, 2021 that expressed an unqualified opinion thereon.thereon.
Basis for Opinion
The Company’sCompany's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’sManagement's Report ofon Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’sCompany's internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.
We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.
Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.
Definition and Limitations of Internal Control Over Financial Reporting
A company’scompany's internal control over financial reporting is a process designed 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. A company’scompany's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’scompany's assets that could have a material effect on the financial statements.
Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young LLP
Dallas, Texas
February 20, 2018


March 1, 2021
127
ITEM 9B.OTHER INFORMATION

Table of Contents
PIONEER NATURAL RESOURCES COMPANY

ITEM 9B.OTHER INFORMATION
None.
PART III
ITEM 10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
ITEM 10.DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE
The names of the executive officers of the Company and their ages, titles and biographies as of the date hereof are incorporated by reference from Part I of this Report. The other information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held duringin May 20182021 and is incorporated herein by reference. 
ITEM 11.EXECUTIVE COMPENSATION
ITEM 11.EXECUTIVE COMPENSATION
The information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held duringin May 20182021 and is incorporated herein by reference.
ITEM 12.SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND
ITEM 12.SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS
Securities Authorized for Issuance under Equity Compensation Plans
The following table summarizesSummarized information about the Company's equity compensation plans is as follows:
As of December 31, 2020
Number of securities to be issued upon exercise of
outstanding options,
warrants and rights (a)
Weighted-average
exercise price of
outstanding
options, warrants
and rights
Number of securities remaining
available for future issuance under equity compensation
plans (excluding securities reflected in first column)
Equity compensation plans approved by security holders:
2006 Long-Term Incentive Plan (b)(c)86,332 $113.69 3,738,724 
Employee Stock Purchase Plan (d)— — 131,210 
86,332 $113.69 3,869,934 
_______________________
(a)There are no outstanding warrants or equity rights awarded under the Company's equity compensation plans.
(b)The number of remaining securities available for future issuance under the Company's 2006 Long-Term Incentive Plan is based on the aggregate securities authorized for issuance under the plan of 12,600,000.
(c)The number of securities remaining for future issuance has been reduced by the maximum number of shares that could be issued pursuant to outstanding grants of performance units as of December 31, 2017:2020.
(d)The number of remaining securities available for future issuance under the Company's Employee Stock Purchase Plan is based on the aggregate securities authorized for issuance under the plan of 1,250,000.
 
Number of securities 
to be issued upon exercise of
outstanding options,
warrants and rights (a)
 
Weighted-average
exercise price of
outstanding
options, warrants
and rights
 
Number of securities remaining
available for future issuance under equity compensation
plans (excluding securities reflected in first column)
Equity compensation plans approved by security holders:     
Pioneer Natural Resources Company:     
2006 Long-Term Incentive Plan (b)(c)138,493
 $100.10
 4,942,245
Employee Stock Purchase Plan (d)
 
 298,715
Total138,493
 $100.10
 5,240,960
_______________________
(a)There are no outstanding warrants or equity rights awarded under the Company's equity compensation plans.
(b)In May 2006, the stockholders of the Company approved the 2006 Long-Term Incentive Plan, which provided for the issuance of up to 9.1 million awards, as was supplementally approved by the stockholders of the Company during May 2009. In May 2016, the stockholders of the Company approved a 3.5 million increase in the number of shares available under the plan. Awards under the 2006 Long-Term Incentive Plan can be in the form of stock options, stock appreciation rights, performance units, restricted stock and restricted stock units.
(c)The number of securities remaining for future issuance has been reduced by the maximum number of shares that could be issued pursuant to outstanding grants of performance units at December 31, 2017.
(d)The number of remaining securities available for future issuance under the Company's Employee Stock Purchase Plan is based on the original authorized issuance of 750,000 shares plus an additional 500,000 shares supplementally approved less 951,285 cumulative shares issued through December 31, 2017.
See Note H8 of Notes to Consolidated Financial Statements included in "Item 8. Financial Statements and Supplementary Data" for a description of each of the Company's equity compensation plans.additional information.
The remaining information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held duringin May 20182021 and is incorporated herein by reference.

128
ITEM 13.CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR
PIONEER NATURAL RESOURCES COMPANY

ITEM 13.CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR
INDEPENDENCE
The information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held duringin May 20182021 and is incorporated herein by reference. 
ITEM 14.PRINCIPAL ACCOUNTING FEES AND SERVICES
ITEM 14.PRINCIPAL ACCOUNTANT FEES AND SERVICES
The information required in response to this Item will be set forth in the Company's definitive proxy statement for the annual meeting of stockholders to be held duringin May 20182021 and is incorporated herein by reference.
PART IV
ITEM 15.EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
ITEM 15.EXHIBITS, FINANCIAL STATEMENT SCHEDULES
(a)Listing of Financial Statements
(a)Listing of Financial Statements
Financial Statements
The following consolidated financial statements of the Company are included in "Item 8. Financial Statements and Supplementary Data:"
Report of Independent Registered Pubic Accounting Firm
Consolidated Balance Sheets as of December 31, 20172020 and 2016
2019
Consolidated Statements of Operations for the Years Ended December 31, 2017, 20162020, 2019 and 2015
2018
Consolidated Statements of Equity for the Years Ended December 31, 2017, 20162020, 2019 and 2015
2018
Consolidated Statements of Cash Flows for the Years Ended December 31, 2017, 20162020, 2019 and 2015
2018
Notes to Consolidated Financial Statements
Unaudited Supplementary Information

(b)Exhibits
(b)Exhibits
The exhibits to this Report that are required to be filed pursuant to Item 15(b) are listed below.
(c)Financial Statement Schedules
(c)Financial Statement Schedules
No financial statement schedules are required to be filed as part of this Report or they are inapplicable.

129

ExhibitsPIONEER NATURAL RESOURCES COMPANY
Exhibits
Exhibit

Number
Description
2.1  *
3.1
3.2—  
3.33.2(a)
4.1
4.2
4.3—  

4.4—  
4.5—  
4.64.3
4.74.4
4.5
4.84.6
4.94.7
10.14.8
4.9
4.10
4.11
4.12
4.13
4.14
130

PIONEER NATURAL RESOURCES COMPANY
4.15(a)
10.1
10.2
10.3—  
10.410.3 H

10.510.4 H
10.610.5 H
10.710.6 H
10.810.7 H
10.910.8 H
10.1010.9 H
10.11 10.10 H
10.12 10.11 H
10.1310.12 H(a)
10.13 H
10.14 H

10.15 H
10.16 H
131

PIONEER NATURAL RESOURCES COMPANY
10.17H
10.18 H
—  

10.1910.18 H

10.20 H
—  

10.21 10.19 H
10.22 10.20 H

10.23 10.21 H
10.22 H
10.24 10.23 H
10.25 10.24 H
10.26 10.25 H
10.27 10.26 H
10.2810.27 H
10.2910.28 H
10.3010.29 H
10.31 10.30 H
10.32 10.31H
10.3310.32H
10.34 10.33 H
132

PIONEER NATURAL RESOURCES COMPANY
10.35 10.34 H
10.35 H (a)
10.36 H
10.37 H
10.38 H
10.39 H

10.39 10.40 H (a)
—  
10.4010.41 H
10.41 H
—  

10.42 H (a)
—  
10.43 H (a)
—  
10.44 H
—  

10.45 H
10.46 10.42 H(a)
10.43 H
10.47 H
—  
10.48 H
—  
10.49 H
—  
10.50 H
—  
10.51 10.44 H
10.52 H
—  
10.53 10.45 H
10.54 H
10.55 10.46 H

10.56 H
—  

10.57 H
—  
10.58 10.47 H
10.59 10.48 H
10.60 10.49 H
10.61 10.50 H
133

PIONEER NATURAL RESOURCES COMPANY
10.62 10.51 H
10.63 10.52 H
10.64 10.53 H
10.65 H
—  
10.54 H
10.66 10.55 H
10.67 10.56 H
10.68 H
—  
10.69 H
—  
10.70 H
—  

12.1 (a)—  
10.57 H
10.58 H
10.59 H
10.60 H
10.61 H
10.62 H
10.63 H
10.64 H
21.1 (a)
23.1 (a)
23.2 (a)
31.1 (a)
31.2 (a)
32.1 (b)
134

PIONEER NATURAL RESOURCES COMPANY
32.2 (b)
95.199.1 (a)
99.1 (a)—  
101. INS (a)XBRL Instance Document.
101. SCH (a)XBRL Taxonomy Extension Schema.
101. CAL (a)
101. DEF (a)
101. LAB (a)
101. PRE (a)
 __________________________
(a)Filed herewith.
(b)Furnished herewith.
HExecutive Compensation Plan or Arrangement.



135

Table of Contents
PIONEER NATURAL RESOURCES COMPANY

ITEM 16.FORM 10-K SUMMARY
None.
136

Table of Contents
SIGNATURES
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.
PIONEER NATURAL RESOURCES COMPANY
Date:March 1, 2021
PIONEER NATURAL RESOURCES COMPANYBy:/s/ Scott D. Sheffield
Date:February 20, 2018
By:/s/ Timothy L. Dove
Timothy L. Dove,
President and Scott D. Sheffield,
Chief Executive Officer

137

Table of Contents
Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

SignatureTitleDate
/s/ Scott D. SheffieldChief Executive Officer and Director (principal executive officer)
March 1, 2021
Scott D. Sheffield
SignatureTitleDate
/s/ Timothy L. DoveNeal H. Shah
President and Chief Executive Officer (principal executive officer)

February 20, 2018
Timothy L. Dove
/s/ Richard P. Dealy
ExecutiveSenior Vice President and Chief Financial Officer
(principal (principal financial officer)
February 20, 2018March 1, 2021
Richard P. DealyNeal H. Shah
/s/ Margaret M. Montemayor
Vice President and Chief Accounting Officer

(principal accounting officer)
February 20, 2018March 1, 2021
Margaret M. Montemayor
/s/ Scott D. SheffieldJ. Kenneth Thompson
Chairman of the Board

of Directors
February 20, 2018March 1, 2021
Scott D. SheffieldJ. Kenneth Thompson
/s/ A.R. AlameddineDirectorMarch 1, 2021
A.R. Alameddine
/s/ Edison C. BuchananDirectorFebruary 20, 2018March 1, 2021
Edison C. Buchanan
/s/ Andrew F. CatesMatt GallagherDirectorFebruary 20, 2018March 1, 2021
Andrew F. CatesMatt Gallagher
/s/ Phillip A. GobeDirectorFebruary 20, 2018March 1, 2021
Phillip A. Gobe
/s/ Larry R. GrillotDirectorFebruary 20, 2018March 1, 2021
Larry R. Grillot
/s/ Stacy P. MethvinDirectorFebruary 20, 2018March 1, 2021
Stacy P. Methvin
/s/ Royce W. MitchellDirectorFebruary 20, 2018March 1, 2021
Royce W. Mitchell
/s/ Frank A. RischDirectorFebruary 20, 2018March 1, 2021
Frank A. Risch
/s/ Mona K. SutphenDirectorFebruary 20, 2018
Mona K. Sutphen
/s/ J. Kenneth ThompsonDirectorFebruary 20, 2018
J. Kenneth Thompson
/s/ Phoebe A. WoodDirectorFebruary 20, 2018March 1, 2021
Phoebe A. Wood
/s/ Michael D. WortleyDirectorFebruary 20, 2018March 1, 2021
Michael D. Wortley


127
138