(Bloomberg) -- BlackRock Inc., the world’s biggest money manager, is expanding top leadership in a reorganization that will result in new roles for at least 10 senior executives.

Charles Hallac, previously chief operating officer, was named co-president and Rob Goldstein, 40, who currently heads the institutional client business and the firm’s Solutions advisory unit, was appointed COO, Chief Executive Officer Laurence Fink and President Robert Kapito said in a memo to staff yesterday.

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