MILWAUKEE - Jerry A. Grundhofer has done it again.

In little more than one year, Mr. Grundhofer has quintupled the size of the banking company he runs -- now known as Firstar Corp. -- via acquisition. First, he combined his old institution, $15 billion-asset Star Banc Corp. of Cincinnati, with $20 billion-asset Firstar of Milwaukee. Then, in September, just 10 months after finalizing the Firstar acquisition, he completed the purchase of $35.5 billion-asset Mercantile Bancorp of St. Louis.

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