UNITED STATES 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 19, 2005 Pioneer Natural Resources Company ----------------------------------------------------- (Exact name of Registrant as specified in its charter) Delaware 1-13245 75-2702753 ---------------------------- ------------ ------------------- (State or other jurisdiction (Commission (I.R.S. Employer of incorporation) File Number) Identification No.) 5205 N. O'Connor Blvd., Suite 900, Irving, Texas 75039 ------------------------------------------------ ---------- (Address of principal executive offices) (Zip Code) (972) 444-9001 ---------------------------------------------------- (Registrant's telephone number, including area code) Not applicable ------------------------------------------------------------- (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions: | | Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) | | Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) | | Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) | | Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) PIONEER NATURAL RESOURCES COMPANY TABLE OF CONTENTS Page Item 5.02. Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers........... 3 Item 9.01. Financial Statements and Exhibits......................... 3 (d) Exhibits............................................ 3 Signature............................................................. 4 Exhibit Index......................................................... 5 2 PIONEER NATURAL RESOURCES COMPANY Item 5.02. Departure of Directors or Principal Officers; Election of Directors; Appointment of Principal Officers On December 19, 2005, Pioneer Natural Resources Company (the "Company") issued a news release that is attached hereto as exhibit 99.1. In the news release, the Company announced that James L. Houghton has retired from its board of directors, effective December 19, 2005, having reached the Company's mandatory retirement age of 75 for board members. Item 9.01. Financial Statements and Exhibits (d) Exhibits 99.1 News Release dated December 19, 2005. 3 PIONEER NATURAL RESOURCES COMPANY S I G N A T U R E 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 Date: December 20, 2005 By: /s/ Darin G. Holderness -------------------------------------- Darin G. Holderness Vice President and Chief Accounting Officer 4 PIONEER NATURAL RESOURCES COMPANY EXHIBIT INDEX Exhibit No. Description ----------- ----------- 99.1(a) News Release dated December 19, 2005. ------------- (a) filed herewith 5