CHICAGO - A new round of executive changes on Wednesday at Bank One Corp., including two promotions and three departures, offered evidence that chief executive James Dimon is looking to raise the level of investment banking savvy in the company's senior ranks.

R. Michael Welborn was named head of the Chicago banking company's middle-market banking group, and David P. Bolger was named head of corporate banking. Both appointments are internal promotions, and are the latest in a series of personnel moves announced this week by Mr. Dimon.

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