The loss came in the Hall of Fame Open, an official tournament of the lower-level ATP Challenger tour, which effectively made Mr. Ackman a tennis pro, if only for a day. It fulfilled a lifelong ambition — and, more than likely, he said, ended his career.

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Former world number one Andy Roddick has criticised the Tennis Hall of Fame’s decision to allow billionaire Bill Ackman to participate in a professional tournament.

Mr. Ackman and another hedge fund titan, Daniel S. Loeb, interviewed a potential campaign hire for Mayor Adams, who is courting their financial support.

In a fresh political flashpoint, billionaire hedge-fund manager Bill Ackman has launched a scathing attack on Zohran Mamdani, New York State Assembly member and potential mayoral candidate, by raking up controversial remarks made by his father,

Bill Ackman said that he was "bullish" as the money market funds hit a record, hinting that rate cuts could direct funds into equity markets.

Pershing Square Capital Management's billionaire chief has sold most of his fund's stake in Chipotle over seven years, and is now piling into his new favorite stock.