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 28, 2004 (DECEMBER 22, 2004) CHESAPEAKE ENERGY CORPORATION ------------------------------------------------------------------------------- (Exact name of Registrant as specified in its Charter) OKLAHOMA 1-13726 73-1395733 ------------------------------------------------------------------------------- (State or other jurisdiction (Commission File No.) (IRS Employer of incorporation) Identification No.) 6100 NORTH WESTERN AVENUE, OKLAHOMA CITY, OKLAHOMA 73118 ------------------------------------------------------------------------------- (Address of principal executive offices) (Zip Code) (405) 848-8000 -------------------------------------------------------------------------------- (Registrant's telephone number, including area code) 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 (see General Instruction A.2. below): [_] 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)) SECTION 5 - CORPORATE GOVERNANCE AND MANAGEMENT ITEM 5.03 AMENDMENTS TO ARTICLES OF INCORPORATION. Effective December 22, 2004, Chesapeake Energy Corporation filed an amendment to the Certificate of Designations of its Series A Junior Participating Preferred Stock with the Oklahoma Secretary of State increasing the number of shares authorized for issuance to 500,000. The Certificate of Designation is attached hereto as exhibit 3.1. ITEM 9.01 - EXHIBITS (c) Exhibits EXHIBIT NO. DOCUMENT DESCRIPTION ----------- -------------------- 3.1 Certificate of Designation of Series A Junior Participating Preferred Stock 2 SIGNATURE 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. CHESAPEAKE ENERGY CORPORATION By: /s/ AUBREY K. MCCLENDON -------------------------------------- Aubrey K. McClendon Chairman of the Board and Chief Executive Officer Dated: December 28, 2004 3 EXHIBIT INDEX EXHIBIT NO. DOCUMENT DESCRIPTION ----------- -------------------- 3.1 Certificate of Designation of Series A Junior Participating Preferred Stock 4