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): May 25, 2004 BANK ONE CORPORATION (Exact Name of Registrant as Specified in its Charter) Delaware 001-15323 31-0738296 -------- --------- ---------- (State or other jurisdiction (Commission File (IRS Employer of incorporation) Number) Identification Number) One Bank One Plaza Chicago, IL 60670 ----------------- (Address of principal executive offices) (zip code) (312) 732-4000 -------------------------------------------------------- (Registrant's telephone number, including area code) ITEM 5. OTHER EVENTS ------------ On May 25, 2004, Bank One Corporation and J.P. Morgan Chase & Co., issued a joint press release, a copy of which is attached as Exhibit 99.1 hereto and is incorporated herein by reference. ITEM 7. FINANCIAL STATEMENTS AND EXHIBITS --------------------------------- (c) Exhibits. 99.1 Joint press release, dated May 25, 2004, issued by Bank One Corporation and J.P. Morgan Chase & Co. SIGNATURE Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunder duly authorized. BANK ONE CORPORATION By: /s/ Heidi Miller --------------------------- Name: Heidi Miller Title: Chief Financial Officer Date: May 27, 2004 EXHIBIT INDEX 99.1 Joint press release, dated May 25, 2004, issued by Bank One Corporation and J.P. Morgan Chase & Co.