SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): December 5, 2021 PIONEER NATURAL RESOURCES COMPANY (Exact name of Registrant as specified in its charter) Delaware 333-26951 75-2702753 (State or other jurisdiction of Registration (I.R.S. Employer incorporation or organization) File Number Identification Number) 1400 Williams Square West, 5205 N. O'Connor Blvd., Irving, Texas 75039 (Address of principal executive offices) (Zip code) Registrant's Telephone Number, including area code : (972) 444-9001 Not applicable (Former name, former address and former fiscal year, if changed since last report) Page 1 of 3 pages. There are no exhibits.
Pioneer Natural Resources Company Item 4. Changes in Registrant's Certifying Accountants At a meeting held on December 5, 1997, the Board of Directors of Pioneer Natural Resources Company (the "Company") approved the engagement of Ernst & Young LLP as the Company's independent auditors for the fiscal year ending December 31, 1998 to replace the firm of KPMG Peat Marwick LLP, who will be dismissed as auditors of the Company after completing the audit of the Company for the fiscal year ending December 31, 1997. The audit committee of the Board of Directors approved the change in auditors on December 5, 1997, subject to ratification by the Company's stockholders. The reports of KPMG Peat Marwick LLP on the Company's financial statements for the past two fiscal years did not contain an adverse opinion or a disclaimer of opinion and were not qualified or modified as to uncertainty, audit scope, or accounting principles. In connection with the audits of the Company's financial statements for each of the two fiscal years ended December 31, 2021 and 1996, and in the subsequent interim period, there were no disagreements with KPMG Peat Marwick LLP on any matters of accounting principles or practices, financial statement disclosure, or auditing scope and procedures which, if not resolved to the satisfaction of KPMG Peat Marwick LLP would have caused KPMG Peat Marwick LLP to make reference to the matter in their report. The Company has requested KPMG Peat Marwick LLP to furnish the Company with a letter addressed to the Securities and Exchange Commission stating whether KPMG Peat Marwick LLP agrees with the above statements. A copy of that letter will be filed with the Securities and Exchange Commission as an amendment to this Form 8-K within 10 business days of this filing. 2 PIONEER NATURAL RESOURCES COMPANY S I G N A T U R E S Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. PIONEER NATURAL RESOURCES COMPANY /s/ M. Garrett Smith Date: December 12, 2021 By: --------------------------------- M. Garrett Smith Executive Vice President and Chief Financial Officer 3
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