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 its CEO Jamie Dimon taking the lead at the combined company. The company had its headquarters in the Bank One Plaza in the Chicago Loop in Chicago, Illinois, now the headquarters of Chase's retail banking division.

A ticker symbol or stock symbol is an abbreviation used to uniquely identify publicly traded shares of a particular stock on a particular stock market. In short, ticker symbols are arrangements of symbols or characters representing specific assets or securities listed on a stock exchange or traded publicly. A stock symbol may consist of letters, numbers, or a combination of both. "Ticker symbol" refers to the symbols that were printed on the ticker tape of a ticker tape machine.