Shares of Bank of America Corp. have fallen 21% in the last month as skittish investors dumped shares of the nation's second-largest banking company on concerns about credit quality.

The stock slipped in early trading Wednesday, then fell further as investors reacted to news that Federal Reserve policymakers indicated they may move to tighten credit further later in the year, though they held the fed funds rate at 6.5% at this week's meeting. Shares of Bank of America dropped 3.46%, to $45.375 for the day.

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