Firstar Corp. shares gained 5.13% Thursday, to $29.4375, after Lehman Brothers put the banking company in its "10 Uncommon Values" portfolio.

The move, spurred by the recommendation of Lehman analyst Michael A. Plodwick, was a vote of confidence in the bank's ability to increase earnings in the wake of its recent deal to buy Mercantile Bancorp. of St. Louis.

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