Investors searching for a fresh strategy for buying bank stocks may need to look no further than the familiar Standard & Poor's 500 stock index.

In less than a year six banking companies have been named to the S&P 500, an honor that boosted the value of their shares by as much as 15.9% on the first day they were listed, bank analyst Henry C. Dickson of Salomon Smith Barney Inc. pointed out in a recent report.

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