Bank One Corp.'s recent management shakeup and sagging stock price have put the company in the unaccustomed position of being talked about as a takeover candidate.

David S. Berry, an analyst at Keefe, Bruyette & Woods Inc., is touting Citigroup Inc. as the most likely acquirer. Citigroup, with assets of $689 billion and market capitalization of $173 billion, is one of only a handful of U.S. companies big enough to afford the $264 billion-asset, Chicago-based Bank One.

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