Bank One Corporation
| Bank One | |
| Formerly | First Banc Group (1968–1979) Banc One Corporation (1979–1998) |
| Company type | Public |
| NYSE: ONE (1979–2004) | |
| Industry | Banking |
| Founded | 1968 |
| Defunct | July 1, 2004 |
| Fate | Acquired by JPMorgan Chase |
| Successor | JPMorgan Chase |
| Headquarters | Bank One Plaza, , United States |
Key people | |
| Products | Financial services |
| Website | bankone.com |
Bank One Corporation was an American bank founded in 1968 and at its peak the sixth-largest bank in the United States. It traded on the New York Stock Exchange under the stock symbol ONE. The company merged with JPMorgan Chase & Co. on July 1, 2004, with Bank One CEO Jamie Dimon soon becoming CEO and Chairman of the combined company but under JPMorgan Chase branding. The company had its headquarters in the Bank One Plaza (now Chase Tower) in the Chicago Loop in Chicago, Illinois, now the headquarters of Chase's retail banking division.
Bank One traces its roots to the merger of Illinois based First Chicago NBD, and Ohio-based First Banc Group (later Bank One), a holding company for the City National Bank in Columbus, Ohio.