Wall Street responded overwhelmingly Friday to the possibility of a takeover of Mercantile Bancorp. in St. Louis, but the company remained mum about its plans.

Mercantile shares soared $5.75, to $57-an 11.2% rise on a day when the Standard & Poor's bank stock index was off 0.94%. More than 1.92 million shares traded hands, nearly six times the company's daily average. It was the day's most actively traded bank stock.

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