Brevan Howard Asset Management is closing the Brevan Howard Equity Strategies Fund, CNBC reports. The firm is shutting the $600 million portfolio following the resignation of its hedge fund manager, Fabrizio Gallo.

Gallo, who managed the five year-old equity strategies fund, has left the firm to join Bank of America Merrill Lynch, where he will be co-head of global equities and European global markets. He joined the asset management firm in 2009 from Morgan Stanley, where he was head of equities and global proprietary trading.

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