Stock sales by insiders have surged at some of the nation's largest banks, suggesting that top executives may see limits to their companies' stock-price increases.

Data from CDA Investnet, Fort Lauderdale, Fla., showed insider selling at Bank of New York Co. leaped to 683,259 shares between Jan. 1 and Aug. 1, from 103,446 in the same period last year.

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