Bank One Corporation

Bank One Corporation
Trade name	Bank One
Formerly	First Banc Group (1968–1979); Banc One Corporation (1979–1998)
Type	public
Traded as	NYSE: ONE (1979–2004)
Industry	banking
Founded	1968
Defunct	July 1, 2004
Fate	Acquired by JPMorgan Chase
Successor	JPMorgan Chase
Headquarters	Bank One Plaza, Chicago Loop, Chicago, Illinois, United States
Key people	Jamie Dimon; John B. McCoy; Frank E. McKinney, Jr.;
Products	financial services
Website

The Chase Tower (formerly the Bank One Plaza) housed the Bank One headquarters

Bank 1 Conference Room Plaque in the Chase Tower Chase Branch - Milwaukee, WI September 2025

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 the JPMorgan Chase brand. The company had its headquarters in the Bank One Plaza (Chase Tower) in the Chicago Loop in Chicago, Illinois, 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.