Shares of Keystone Financial Corp. rose 4.7% Tuesday after Standard & Poor's Corp. announced the banking company would join the S&P MidCap 400 index after the close of trading Nov. 19.

Keystone, a $6.9 billion-asset company based in Harrisburg, Pa., will replace Firstar Corp., whose proposed merger with Star Banc Corp. is expected to close Thursday. S&P said Firstar, as the combined company would be called, would not appear on another index "at this time."

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