When William Ackman, founder of activist hedge fund firm Pershing Square Capital Management, co-hosted the Harbor Investment Conference in Manhattan in February, he created plenty of buzz by inviting Mark Cohen up to the stage and asking the young hedge fund manager to give an impromptu presentation on his best current investment idea. Ackman also told the crowd that he invests in Cohens Stone House Capital Management. Cohen, 31, launched Stone House in 2010, having previously worked as a senior analyst at New Yorkbased long-short equity hedge fund firm Force Capital Management. The Chappaqua, New York, native, who holds a BS in economics from the Wharton School of the University of Pennsylvania, likes to run a concentrated portfolio and doesnt fear volatility. Stone House manages only about $50 million, but as of the first quarter its long-short equity funds compounded net annual return since inception topped 43 percent. Ackman is Cohens largest investor.
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