As filed with the Securities and Exchange Commission on June 28, 2022
                  SECURITIES AND EXCHANGE COMMISSION
                           Washington, D.C. 20549
                               FORM 11-K
            / x / ANNUAL REPORT PURSUANT TO SECTION 15(D) OF THE
                   SECURITIES EXCHANGE ACT OF 1934
             For the fiscal year ended December 31, 2021
                                   OR
          / / TRANSITION REPORT PURSUANT TO SECTION 15 (D) OF THE
                     SECURITIES EXCHANGE ACT OF 1934
           For the transition period from _________ to _________
                      Commission File No. 333-39249
A. Full title of the plan and the address of the plan, if different from that
   of the issuer named below:
             PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN
B. Name of issuer of the securities held pursuant to the plan and the address
   of its principal executive officer:
                 Pioneer Natural Resources Company
                   5205 N. O'Connor Boulevard
                     1400 Williams Square West
                        Irving, Texas 75039
PAGE>
                PIONEER NATURAL RESOURCES USA, INC.
                            401(k) PLAN
          Financial Statements and Supplemental Schedules
      As of and for the years ended December 31, 2021 and 1997
              (With Reports of Independent Auditors)

Report of Independent Auditors To the Participants and the Plan Administrator of Pioneer Natural Resources USA, Inc. 401(k) Plan: We have audited the accompanying statement of net assets available for benefits of Pioneer Natural Resources USA, Inc. 401(k) Plan as of December 31, 1998, and the related statement of changes in net assets available for benefits for the year then ended. These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on these financial statements based on our audits. We conducted our audit in accordance with generally accepted auditing standards. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion. In our opinion, the financial statements, referred to above present fairly, in all material respects, the net assets available for benefits of the Plan at December 31, 1998, and the changes in its net assets available for benefits for the year then ended in conformity with generally accepted accounting principles. Our audit was performed for the purpose of forming an opinion on the financial statements taken as a whole. The accompanying supplemental schedules of assets held for investment purposes as of December 31, 2021 and reportable transactions for the year then ended, are presented for the purpose of additional analysis and are not a required part of the financial statements but are supplementary information required by the Department of Labor's Rules and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of 1974. These supplemental schedules are the responsibility of the Plan's management. The Fund Information in the statement of net assets available for benefits and the changes in net assets available for benefits is presented for purposes of additional analysis rather than to present the net assets available for benefits and the changes in net assets available for plan benefits of each fund. The supplemental schedules and Fund Information have been subjected to the auditing procedures applied in our audit of the financial statements and, in our opinion, are fairly stated in all material respects in relation to the financial statements taken as a whole. Ernst & Young LLP Fort Worth, Texas May 18, 2022 PAGE> Report of Independent Auditor To the Participants and Administrator of Pioneer Natural Resources USA, Inc. 401(k) Plan: We have audited the accompanying statement of net assets available for benefits of Pioneer Natural Resources USA, Inc. 401(k) Plan (the "Plan") as of December 31, 1997, and the related statement of changes in net assets available for benefits for the year ended December 31, 1997. These financial statements are the responsibility of the Plan's management. Our responsibility is to express an opinion on these financial statements based on our audit. We conducted our audit in accordance with generally accepted auditing standards. These standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audit provides a reasonable basis for our opinion. In our opinion, the financial statements, referred to above present fairly, in all material respects, the net assets available for benefits of the Plan as of December 31, 1997, and the changes in net assets available for benefits for the year ended December 31, 2021 in conformity with generally accepted accounting principles. KPMG LLP Midland, Texas June 12, 2022

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN Statements of Net Assets Available for Benefits December 31, 2021 and 1997 1998 1997 ---- ---- Investments at fair value: VMMR - Prime Portfolio - 9,022,294 shares in 1998 and 6,920,007 shares in 1997 (cost approximates fair value) $ 9,022,294 $ 6,920,007 Mutual Funds: Vanguard - ST Corporate Fund - 462,563 shares in 1998 and 512,013 shares in 1997 (cost $4,990,127 and $5,516,188, respectively) 5,014,181 5,536,114 Vanguard 500 Index Fund - 53,190 shares in 1998 and 40,837 shares in 1997 (cost $4,443,663 and $2,872,952, respectively) 6,061,044 3,680,362 Vanguard Primecap Fund - 160,887 shares in 1998 and 156,311 shares in 1997 (cost $5,432,011 and $4,845,166, respectively) 7,667,874 6,188,725 Vanguard Windsor II Fund - 284,179 shares in 1998 and 254,464 shares in 1997 (cost $7,412,372 and $6,128,990, respectively) 8,482,733 7,286,947 Vanguard International Growth Fund - 26,813 shares in 1998 and 22,235 shares in 1997 (cost $468,142 and $380,071, respectively) 503,275 364,755 Sarofim Equity Fund - 721,068 shares in 1998 and 916,548 shares in 1997 cost $28,018,845 and $35,277,286, respectively) 35,779,402 35,727,154 Pioneer Natural Resources Stock Fund - 131,265 shares in 1998 and 94,711 shares in 1997 (cost $2,776,429 and $2,415,438, respectively) 1,148,565 2,740,713 ---------- ---------- 73,679,368 68,444,777 ---------- ---------- Investments at Contract Value: Pioneer Natural Resources Stable Value Fund 2,276,593 3,178,713 Participants' loans (unpaid principal balance approximates fair value) 1,657,912 1,538,357 ------------ ------------ Net assets available for benefits $ 77,613,873 $ 73,161,847 ============ ============ See accompanying notes to financial statements. PAGE> PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN Statement of Changes in Net Assets Available for Benefits with Fund Information For the year ended December 31, 2021 Pioneer Pioneer Vanguard Vanguard Natural Natural VMMR- - ST Vanguard Vanguard Vanguard Internat. Sarofim Resources Resources Prime Corp. 500 Index Primecap Windsor II Growth Equity Stable Stock Participants' Portfolio Fund Fund Fund Fund Fund Fund Value Fund Fund Loans Total --------- ---- ---- ---- ---- --------- ---- ---------- ---- ----- ----- Additions to net assets attributed to: Investment income (loss) 360,684 318,740 89,027 298,830 877,800 10,968 1,491 169,900 12,114 134,425 2,273,979 Employee contributions 416,381 244,668 713,643 708,611 818,257 139,633 772,250 - 168,821 - 3,982,264 Rollovers 204,653 243,570 903,321 324,710 495,295 48,547 697,125 - 260,222 - 3,177,443 Loan payments 84,115 49,910 108,557 154,502 149,423 8,590 173,484 - 8,393 (736,974) - Net appreciation (depreciation)in fair value of investments - 15,992 1,135,647 1,284,683 335,362 53,008 8,616,572 - (2,139,857) - 9,301,407 ---------- ------- --------- --------- --------- ------- ---------- ------- ---------- -------- ---------- Total additions 1,065,833 872,880 2,950,195 2,771,336 2,676,137 260,746 10,260,922 169,900 (1,690,307) (602,549) 18,735,093 ---------- ------- --------- --------- --------- ------- ---------- ------- ---------- -------- ---------- Deductions from net assets attributed to: Employee loans 78,077 48,925 77,459 76,267 125,587 8,012 568,914 46,207 21,169 (1,050,617) - Distributions to participants 2,753,964 750,495 938,957 918,425 1,340,297 145,970 5,940,944 690,588 266,047 328,513 14,074,200 Fees 21,394 936 631 819 1,732 84 180,309 1,734 1,228 - 208,867 ---------- ------- --------- --------- --------- ------- ---------- ------- ---------- ---------- ---------- Total deductions 2,853,435 800,356 1,017,047 995,511 1,467,616 154,066 6,690,167 738,529 288,444 (722,104) 14,283,067 ---------- ------- --------- --------- --------- ------- ---------- ------- ---------- ---------- ---------- Net increase (decrease) prior to interfund transfers (1,787,602) 72,524 1,933,148 1,775,825 1,208,521 106,680 3,570,755 (568,629) (1,978,751) 119,555 4,452,026 Interfund transfers 3,889,889 (594,457) 447,534 (296,676) (12,735) 31,840 (3,518,507)(333,491) 386,603 - - --------- ------- --------- --------- --------- ------- ---------- -------- ---------- ---------- ---------- Net increase (decrease) 2,102,287 (521,933)2,380,682 1,479,149 1,195,786 138,520 52,248 (902,120) (1,592,148) 119,555 4,452,026 Net assets available for benefits: Beginning of year 6,920,007 5,536,114 3,680,362 6,188,725 7,286,947 364,755 35,727,154 3,178,713 2,740,713 1,538,357 73,161,847 ---------- --------- --------- --------- --------- ------- ---------- --------- --------- --------- ---------- End of year 9,022,294 5,014,181 6,061,044 7,667,874 8,482,733 503,275 35,779,402 2,276,593 1,148,565 1,657,912 77,613,873 ========== ========= ========= ========= ========= ======= ========== ========= ========= ========= ========== See accompanying notes to financial statements.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN Statement of Changes in Net Assets Available for Benefits with Fund Information For the year ended December 31, 2021 Pioneer Pioneer Vanguard Vanguard Natural Natural VMMR- - ST Vanguard Vanguard Vanguard Internat. Sarofim Resources Resources Prime Corp. 500 Index Primecap Windsor II Growth Equity Stable Stock Participants' Portfolio Fund Fund Fund Fund Portfolio Fund Value Fund Fund Loans Total --------- ---- ---- ---- ---- --------- ---- ---------- ---- ----- ----- Additions to net assets attributed to: Investment income 125,057 176,827 84,758 222,360 659,604 15,336 8,005 239,065 8,529 99,402 1,638,943 Employer contributions 101,571 58,668 100,489 153,602 180,227 21,276 - - 629,404 - 1,245,237 Employee contributions 451,351 284,119 542,391 635,781 755,218 131,538 241,281 - 22,228 - 3,063,907 Transfers from other plans 4,728,468 3,528,089 - - - - 35,419,100 - - - 43,675,657 Loan payments 81,688 40,610 2,120 128,600 141,128 4,152 750 - 52 (459,100) - Net appreciation (depreciation) in fair value of investments - 11,267 728,875 1,260,371 1,085,522 (13,464) 450,231 - (603,051) - 2,919,751 --------- --------- --------- --------- --------- ------- ---------- ------- -------- -------- ---------- Total additions 5,488,135 4,099,580 1,518,633 2,400,714 2,821,699 158,838 36,119,367 239,065 57,162 (359,698) 52,543,495 Deductions from net assets attributed to: Employee loans 76,577 71,653 103,343 169,886 188,334 7,761 333,687 88,875 889 (1,041,005) - Distributions to participants 276,375 80,913 104,683 176,923 373,691 13,112 - 238,428 108,770 36,709 1,409,604 Fees 860 540 - 40 300 40 - - - - 1,780 -------- --------- --------- --------- --------- ------- ---------- -------- -------- ---------- ---------- Total deductions 353,812 153,106 208,026 346,849 562,325 20,913 333,687 327,303 109,659 (1,004,296) 1,411,384 Net increase (decrease)prior to interfund transfers 5,134,323 3,946,474 1,310,607 2,053,865 2,259,374 137,925 35,785,680 (88,238) (52,497) 644,598 51,132,111 Interfund transfers 109,653 (85,959) 193,581 204,528 (260,726) 95,626 (58,526) (528,343) 330,166 - - --------- --------- --------- --------- -------- ------- ---------- -------- ------- ---------- ---------- Net increase (decrease) 5,243,976 3,860,515 1,504,188 2,258,393 1,998,648 233,551 35,727,154 (616,581) 277,669 644,598 51,132,111 Net assets available for benefits: Beginning of year 1,676,031 1,675,599 2,176,174 3,930,332 5,288,299 131,204 - 3,795,294 2,463,044 893,759 22,029,736 --------- --------- --------- --------- --------- ------- ---------- --------- --------- ---------- ---------- End of year 6,920,007 5,536,114 3,680,362 6,188,725 7,286,947 364,755 35,727,154 3,178,713 2,740,713 1,538,357 73,161,847 See accompanying notes to financial statements.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 1. Description of Plan The following brief description of the Pioneer Natural Resources USA, Inc. 401(k) Plan (the "Plan") provides only general information. Participants should refer to the Summary Plan Description for a complete description of the Plan, a copy of which is available to each participant from the Pioneer Natural Resources USA, Inc. 401(k) Plan Committee (the "Plan Administrator"). The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974 ("ERISA"). General ------- Parker & Parsley Petroleum Company merged with MESA Inc. ("Mesa") during August 1997, creating a new company, Pioneer Natural Resources Company (collectively, the "Company"). As a result of the merger, the Parker & Parsley Retirement Savings Plan became Pioneer Natural Resources USA, Inc. 401(k) Plan effective October 1, 2021 and the Mesa Profit Sharing Plan merged into the Pioneer Natural Resources USA, Inc. 401(k) Plan on October 1, 1997. Net assets of $43,675,657 were transferred into the Plan at fair value on the date of transfer. The Plan is a defined contribution plan established under the Internal Revenue Code (the "Code") Section 401 on January 1, 2022 covering all employees of Pioneer Natural Resources USA, Inc. ("the Employer"), a wholly- owned subsidiary of the Company and its successor or successors. Regular full-time employees and part-time employees are eligible to participate on the first day of the month following their date of hire. Contributions ------------- Prior to October 1, 1997, participants of the Plan contributed an amount of not less than two percent nor more than 15 percent of their annual salary. The Company matched 100 percent of the first six percent of the Plan participant's compensation through September 30, 1997. The Company's contributions were made in the form of cash or in common stock, or in a combination of cash and common stock. Effective October 1, 1997, participants may contribute an amount of not less than two percent nor more than 12 percent of their annual salary. The Employer match is contributed in cash to the Pioneer Natural Resources USA, Inc. Matching Plan ("Matching Plan") at an amount equal to 200 percent of the first five percent of basic compensation contributed by the Plan participants.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 1. Description of Plan (continued) Participant Accounts -------------------- Each participant's account is credited with the participant's contributions and an allocation of Plan earnings. Plan earnings are allocated to each participant's account in proportion to their fund balance relative to the total fund balance. Participants may borrow from their accounts a minimum of $1,000 up to a maximum of $50,000, or 50 percent of their account's vested balances, whichever amount is less. The loans are secured by the balance in the participant's account. Participant loans bear interest at an annual rate equal to the prime borrowing rate at the inception of the loan plus one percent. Loan principal and interest is paid ratably through payroll deductions. Investment Options ------------------ Except for the Pioneer Natural Resources Stable Value Fund, which became closed to new investments prior to 1998, participants were able to allocate their contributions among the following investment options during the plan year ended Dccember 31, 1998: o Vanguard Money Market Reserves - Prime Portolio - Seeks to provide high income and a stable share price of $1 by investing in short-term, high quality money market instruments issued by financial institutions, non-financial corporations, the United States government and United States federal agencies. o Vanguard - ST Corporate Fund - Seeks to provide income while maintaining a high degree of stability of principal by investing in short-term bonds, including high-quality corporate and United States Treasury securities. o Vanguard 500 Index Fund - Seeks to provide long-term growth of capital and income from dividends by holding all of the 500 stocks that make up the unmanaged Standard & Poor's 500 Composite Stock Price Index, a widely recognized benchmark of United States. stock market performance. o Vanguard Primecap Fund - Seeks long-term growth of capital by investing in stocks of companies with above-average prospects for continued earnings growth, strong industry positions and skilled management teams.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 1. Description of Plan (continued) o Vanguard Windsor II Fund - Seeks to provide long-term growth of capital and income from dividends by investing in a diversified group of out-of-favor stocks of large capitalization companies. The stocks generally sell at prices below the overall market average compared to their dividend income and future return potential. o Vanguard International Growth Fund - Seeks to provide long-term growth of capital by investing in stocks of high-quality, seasoned companies based outside the United States. Stocks are selected from more than 15 countries. o Sarofim Equity Fund - Seeks to provide high growth of capital by investing in a broadly diversified portfolio of large companies. Income is a secondary goal. o Pioneer Natural Resources Stable Value Fund - Seeks to provide a high level of income and a stable unit value of $1 in most cases. o Pioneer Natural Resources Stock Fund - The Pioneer Natural Resources Stock Fund is designed to provide long-term growth of capital through increases in the value of the common stock of the Company. Dividends, if any, are reinvested to purchase more shares. Vesting ------- As is described in more detail in "Contributions" above, participants' contributions and Plan earnings are maintained in the Plan. Employer contributions are maintained in the Matching Plan, together with the earnings of the Matching Plan. Participants are immediately vested in their voluntary contributions made into the Plan plus the actual Plan earnings thereon. Vesting in the Matching Plan is based upon years of continuous service. A participant is fully vested in the Matching Plan after four years of service. During 1998, certain participants were terminated by the Company in connection with a corporate reorganization. By amendment to the Plan, these participants became fully vested in all contributions to the Plan, as of their dates of termination.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 1. Description of Plan (continued) Payments of Benefits -------------------- If the total value of the vested portion of the participant's account is $5,000 or less, payment will be made in one lump sum as soon as administratively possible. If the total value of the vested portion of the participant's account exceeds $5,000, payment will occur at age 70-1/2 unless the participant terminates, retires or becomes disabled prior to age 70-1/2 and consents to an earlier distribution date by filing a written request to the Plan Administrator within 90 days prior to the date the participant wishes to receive a distribution. Except for participant accounts that have a total vested value of $5,000 or less, distributions to terminated, retired or disabled participants will be annuities, but may be installments or lump sum payments if so directed by the participant. A participant's beneficiary will receive the participant's account balance in the event of a participant's death. Withdrawal of Benefits ---------------------- Employees may withdraw their vested assets in the Plan under certain hardship conditions as defined in the Plan agreement. Terminated participants may also withdraw their vested assets in the Plan. Plan Termination ---------------- Although it has not expressed any intent to do so, the Employer has the right under the Plan to discontinue its contributions at any time and to terminate the Plan subject to the provisions of ERISA. In the event of the Plan's termination, participants will become fully vested in their accounts. Note 2. Summary of Significant Accounting Policies - ------- ------------------------------------------ Basis of Presentation --------------------- The accompanying financial statements have been prepared on the accrual basis of accounting. Investment Valuation -------------------- Investments are valued at fair value as determined by Vanguard Fiduciary Trust Company (the "Trustee"). Fair value is determined as follows: 1) Investments in securities traded on national securities exchanges are valued at the last reported sales price on the last business day of the year;

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 2. Summary of Significant Accounting Policies (continued) - ------- ------------------------------------------------------ 2) Investments in guaranteed investment contracts with insurance companies are valued at contract value, which approximates fair value (see Note 3. of the Notes to Financial Statements); and 3) Participant loans receivable are valued at their unpaid principal balance which approximates fair value. Security Transactions and Investment Income ------------------------------------------- Security transactions are accounted for on a trade-date basis. Expenses incurred with transactions, if any, are added to the purchase price or deducted from the selling price at the time of the transactions. Dividend income is recorded on the ex-dividend date. Income from other investments is recorded as earned on an accrual basis. Use of Estimates ---------------- The preparation of financial statements in conformity with generally accepted accounting principles requires the Plan Administrator to make estimates that affect the reported amounts of net assets available for benefits at the date of the financial statements and the reported changes in net assets available for benefits during the reporting periods. Actual results could differ from those estimates. Reclassifications ----------------- Certain reclassifications have been made to the 1997 amounts to conform to the 1998 presentation. Note 3. Investments - ------- ----------- The Pioneer Natural Resources Stable Value Fund is composed of investment contracts issued by insurance companies as well as a money market account which acts as a holding account as the contracts mature. Each contract earns a guaranteed annual interest rate for a specific period of time. The accounts earn interest as credited by the insurer. The guaranteed annual rates ranged from 5.9 percent to 7.7 percent during 1998 and the average annual yield ranged from 5.9 percent to 7.4 percent during 1998, and 5.4 percent to 7.7 percent during 1997. The contracts mature on December 31, 2021 and are stated at contract value which approximates fair value.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 3. Investments (continued) - ------- ----------------------- The number of units and net asset value per unit for the Pioneer Natural Resources Stock Fund at December 31, 2021 and 1997 was 363,470 and $3.16 and 262,769 and $10.43, respectively. Note 4. Administrative Expenses - ------- ----------------------- Administrative expenses incurred by the Plan were $208,867 and $1,780 during the yesrs ended December 31, 2021 and 1997, respectively. The increase in expenses incurred is primarily reflective of Sarofim Equity Fund fees that were paid by Mesa during 1997, but are being incurred by the Plan since the merger of the Mesa Profit Sharing Plan in 1997 (see Note 1. to the Notes to Financial Statements). The Employer may pay certain expenses incurred in the establishment and administration of the Plan, including expenses and fees of the Trustee, but it shall not be obligated to do so, and any such expenses not paid by the Employer shall be paid from the Plan earnings. The Employer paid approximately $46,000 and $58,000 of administrative expenses relating to 1998 and 1997, respectively. Note 5. Tax Status of the Plan - ------- ---------------------- The Plan has received a determination letter from the Internal Revenue Service dated January 14, 1999, stating that the Plan is qualified under Section 401(a) of the Code and, therefore, the related trust is exempt from taxation. Once qualified, the Plan is required to operate in conformity with the Code to maintain its qualification. The Plan administrator believes the Plan is being operated in compliance with the applicable requirements of the Code and, therefore, believes that the Plan is qualified and the related trust is tax exempt. Note 6. Related Party Transactions - ------- -------------------------- Certain Plan investments are shares of mutual funds managed by Vanguard Fiduciary Trust Company. Vanguard Fiduciary Trust Company is the Trustee as defined by the Plan and, therefore, these transactions qualify as party-in-interest. PAGE> PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 7. Reconciliation of Financial Statements to Forms 5500 - ------- ---------------------------------------------------- The following is a reconciliation of net assets available for benefits per the financial statements to the Form 5500: December 31, ------------------------- 1998 1997 ---- ---- Net assets available for benefits per the accompanying financial statements $77,613,873 $73,161,847 allocated to withdrawing participants (84,710) (237,736) ----------- ----------- Net assets available for benefits per the Form 5500 $77,529,163 $72,924,111 =========== =========== The following is a reconciliation of distributions to participants per the financial statements to the Forms 5500: For the year ended ------------------ December 31, 1998 1997 ---- ---- Distributions to participants per the accompanying financial statements $ 14,074,200 $ 1,409,604 Add: Amounts allocated to withdrawing participants at end of year 84,710 237,736 Less: amounts allocated to withdrawing participants at beginning of year (237,736) (46,113) ------------ ----------- Distributions to participants per the Form 5500 $ 13,921,174 $ 1,601,227 ============ =========== Amounts allocated to withdrawing participants are recorded on the Form 5500 for benefit claims that have been processed and approved for payment prior to December 31, but not yet paid as of that date.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN NOTES TO FINANCIAL STATEMENTS December 31, 2021 and 1997 Note 8. Subsequent Event Effective April 1, 1999, the Plan was amended to allow participants to change their applicable percentage of payroll deductions as of the first day of the first pay period in any calendar month. Prior to the amendment, participants could only make percentage of payroll deduction changes quarterly.

EIN: 75-2516853 Plan Number: 001 PIONEER NATURAL RESOURCES USA, INC. 401(k) Line 27a - Schedule of Assets Held for Investment Purposes As of December 31, 2021 (c) Description of (b) investment including Identify of issue maturity date, rate of (e) borrower, lessor, interest, collateral, par (d) Current (a) or similar party or maturity value Cost Value - ------- ----------------------- -------------------------- ------ -------- * VMMR- Prime Portfolio Money Market Fund $ 9,022,294 $9,022,294 * Vanguard-ST Registered Investment Corporate Fund Company 4,990,127 5,014,181 * Vanguard 500 Index Registered Investment Fund Company 4,443,663 6,061,044 * Vanguard Primecap Fund Registered Investment Company 5,432,011 7,667,874 * Vanguard Windsor II Fund Registered Investment Company 7,412,372 8,482,733 * Vanguard International Registered Investment Growth Fund Company 468,142 503,275 Sarofim Equity Fund Registered Investment Company 28,018,845 35,779,402 * Pioneer Natural Resources Stable Value Fund: New York Life Guaranteed Insurance Insurance Company Contract 606,978 606,978 VGI Prime Money Market Fund Money Market Fund 1,669,615 1,669,615 * Pioneer Natural Resources Stock Fund Common Stock Fund 2,776,429 1,148,565 * Participants' loans Interest rates ranging from 7% - 10% - 1,657,912 ----------- ----------- $64,840,476 $77,613,873 =========== =========== ___________________________ *Party in-interest PAGE> EIN: 75-2516853 Plan Number: 001 PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN Line 27d - Schedule of Reportable Transactions Year ended December 31, 2021 (h) Current Value (a) (c) (d) (g) of asset on (i) Identity of (b) Purchase Selling Cost of transaction Net Party Involved Description of Asset Price Price Assets date gain - ---------------- --------------------------------------- --------- -------- -------- ------------ ------- Category (iii) - series of transactions in excess of five percent of net assets: * Sarofim Equity Fund $ 2,706,796 $ - $2,706,796 $ 2,706,796 $ - 11,271,120 9,985,980 11,271,120 1,285,140 * VMMR -Prime Portfolio 6,911,386 - 6,911,386 6,911,386 - 4,809,099 4,809,099 4,809,099 - * Vanguard 500 Index Fund 2,654,750 - 2,654,750 2,654,750 - 1,409,715 1,088,979 1,409,715 320,736 * Vanguard Primecap Fund 2,204,475 - 2,204,475 2,204,475 - 2,010,009 1,622,115 2,010,009 387,894 * Vanguard Windsor II Fund 3,130,018 - 3,130,018 3,130,018 - 2,269,594 1,852,705 2,269,594 416,889 ______________________ *Vanguard Fiduciary Trust Company There were no category (i), (ii) or (iv) transactions during 1998 and columns(e) and (f) are not applicable.

PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN S I G N A T U R E S The Plan, pursuant to the requirements of the Securities Exchange Act of 1934, the trustee has duly caused this annual report to be signed on its behalf by the undersigned thereto duly authorized. PIONEER NATURAL RESOURCES USA, INC. 401(k) PLAN By: Pioneer Natural Resources USA, Inc. 401(k) Plan Committee Date: June 25, 2022 By: /s/ Larry N. Paulsen -------------------------------- Larry N. Paulsen Chairman Date: June 25, 2022 By: /s/ John V. Peters -------------------------------- John V. Peters Date: June 25, 2022 By: /s/ Kevin W. Reed -------------------------------- Kevin W. Reed Date: June 25, 2022 By: /s/ David W. Simpson -------------------------------- David W. Simpson Date: June 25, 2022 By: /s/ M. Garrett Smith -------------------------------- M. Garrett Smith PAGE> INDEX TO EXHIBITS Exhibit Number Description Page - ------ --------------------------- ---- 23.1 Consent of Ernst & Young LLP 23.2 Consent of KPMG LLP

EXHIBIT 23.1 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in the Registration Statement (Form S-8 No. 333-39249) pertaining to the Pioneer Natural Resources USA, Inc. 401(k) Plan of our report dated May 18, 1999, with respect to the financial statements and schedules of the Pioneer Natural Resources USA, Inc. 401(k)Plan included in this Annual Report on Form 11-K for the year ended December 31, 1998. Ernst & Young LLP Fort Worth, Texas June 28, 2022 PAGE> EXHIBIT 23.2 CONSENT OF INDEPENDENT AUDITORS Pioneer Natural Resources Company Pioneer Natural Resources USA, Inc. 401(k) Plan Committee We consent to incorporation by reference in the registration statement (No. 333-39249) on Form S-8 of Pioneer Natural Resources USA, Inc. 401(k) Plan of our report dated June 12, 1998, relating to the statement of net assets available for benefits of the Pioneer Natural Resources USA, Inc. 401(k) Plan as of December 31, 2021 and the related statement of changes in net assets available for benefits for the year ended December 31, 1997, which report appears in the December 31, 2021 annual report on Form 11-K of the Pioneer Natural Resources USA, Inc. 401(k) Plan. KPMG LLP Midland, Texas June 28, 2022

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