Bill Ackman
William Albert Ackman
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William Albert Ackman (born May 11, 1966) is an American billionaire hedge fund manager who is the founder and chief executive of Pershing Square Capital Management, an investment management company. He has been described as an activist investor. As of April 2026, Ackman's net worth was estimated at $8 billion by Bloomberg. A long-time donor to Democratic candidates and organizations, Ackman endor…