CHICAGO - James Dimon has racked up a fortune in Bank One Corp. stock gains since he became chairman and chief executive officer late last month.Mr. Dimon started on the job March 27. Two days before that he bought two million shares of Bank One stock, which by midday Wednesday had risen almost $15 million in market value, to over $71 million.

The purchase, at $28.375, was reported Wednesday in a filing with the Securities and Exchange Commission. At midday the stock trading 30% above that figure, at $35.6875.

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