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Bank One to Report 2004 First Quarter Earnings and Host Conference Call on April 20 CHICAGO, March 19 /PRNewswire-FirstCall/ -- Bank One Corporation will release its first quarter 2004 earnings results on Tuesday, April 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 p.m. (Eastern). To participate in the conference call, please call the number below approximately 10 minutes before the scheduled conference time: Domestic (800) 811-0667 International (913) 981-4901 Confirmation Code 483483 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 p.m. (Eastern) on Tuesday, April 20, through Friday, April 30. Please dial (888) 203-1112 (domestic) or (719) 457-0820 (international); confirmation code 483483. Bank One Corporation ( http://www.bankone.com/ ) is the nation's sixth-largest bank holding company, with assets of more than $325 billion. Bank One currently has more than 50 million credit cards issued, serves nearly 7 million retail households, and approximately 20,000 middle market customers. It also manages more than $185 billion of clients' investment assets. 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 Investors, Amy R. Fahey, +1-312-732-5771, both of Bank One Corporation Web site: http://www.shareholder.com/one/medialist.cfm http://www.bankone.com/

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