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Bank One to Report 2003 Fourth Quarter Earnings and Host Conference Call On January 20 CHICAGO, Dec. 19 /PRNewswire-FirstCall/ -- Bank One Corporation will release its fourth quarter 2003 earnings results on Tuesday, January 20, 2004. The earnings release will be available at approximately 8 a.m. (Eastern) on the Internet at http://www.bankone.com/ . (Logo: http://www.newscom.com/cgi-bin/prnh/20030116/NYTH053LOGO ) Chairman and CEO Jamie Dimon and Chief Financial Officer Heidi Miller will review the quarter's results in a conference call for investors and analysts beginning at 3:00 p.m. (Eastern). To participate in the conference call, please call the number below approximately 10 minutes before the scheduled conference time: Domestic (800) 361-0912 International (913) 981-5559 Confirmation Code 755652 R.S.V.P. IS NOT REQUIRED The conference call will also be available via a live webcast, which can be accessed through the Investor Relations section of Bank One's website at http://www.shareholder.com/one/medialist.cfm . A playback of the conference call will be available after 6:00 p.m. (Eastern) on Tuesday, January 20, through Friday, January 30. Please dial (888) 203-1112 (domestic) or (719) 457-0820 (international); confirmation code 755652. Bank One Corporation is the nation's sixth-largest bank holding company, with assets of $290 billion. Bank One currently has more than 51 million credit cards issued, and serves nearly 7 million retail households and more than 20,000 middle market customers. It also manages $175 billion of clients' investment assets. Bank One can be found on the Internet at http://www.bankone.com/ . http://www.newscom.com/cgi-bin/prnh/20030116/NYTH053LOGO http://photoarchive.ap.org/ DATASOURCE: Bank One Corporation CONTACT: Media, Thomas A. Kelly, +1-312-732-7007, or Investor, Amy R. Fahey, +1-312-732-5771, both of Bank One Corporation Web site: http://www.bankone.com/

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