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) ------------------------------------------------------------------------------- SEPTEMBER 28, 2004 (SEPTEMBER 23, 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 230.1425) [ ] 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 - AMENDMENT TO ARTICLES OF INCORPORATION Effective September 23, 2004, Chesapeake Energy Corporation (the "Company") filed a Certificate of Elimination with the Oklahoma Secretary of State retiring 283,600 shares of our 6.75% Cumulative Convertible Preferred Stock, par value $0.01 per share. Such shares of 6.75% Preferred Stock were acquired by the Company as the result of a conversion of the Preferred Stock into the Company's Common Stock, par value $0.01 per share, by the holder. 2 SIGNATURES 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: September 28, 2004 3