The three largest U.S. banks are set to control nearly a third of the nation's retail market share, according to data released Monday by SNL Financial.

Bank of America Corp. held $719.8 billion of U.S. deposits, followed by Wells Fargo & Co. at $711.5 billion and JPMorgan Chase & Co. at $649.3 billion. All three surpassed the 10% national market share threshold, with B of A at 11.31%, Wells at 11.18% (including the deposits it would gain by acquiring Wachovia Corp.), and JPMorgan Chase at 10.20%.

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