Bob McCann, the head of the brokerage force at Merrill Lynch & Co., plans to leave the securities firm, with the announcement coming just days after the completion of Merrill's acquisition by Bank of America Corp.

Mr. McCann had led the wealth-management division at Merrill, but saw his responsibilities narrowed slightly in a new lineup set last October by Bank of America. At the time, Bank of America said a higher-ranking "global wealth and investment management" job would be filled by another executive yet to be named.

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