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): June 28, 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 7.01. Regulation FD Disclosure............................. 3 Item 9.01. Financial Statements and Exhibits (c) Exhibits....................................... 3 Signature........................................................ 4 Exhibit Index.................................................... 5 2 PIONEER NATURAL RESOURCES COMPANY Item 7.01. Regulation FD Disclosure On June 28, 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 it has signed agreements with two parties for the purchase of additional assets in two of its U.S. onshore core areas, the Permian Basin and South Texas, for a total purchase price of approximately $177 million. The transactions are expected to close within 30 days. Item 9.01. Financial Statements and Exhibits (c) Exhibits 99.1 News Release dated June 28, 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: June 30, 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 June 28, 2005. ------------- (a) filed herewith 5