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Fortune
Fortune
Eva Roytburg

Bill Ackman has been quietly buying Microsoft since February, when AI fears were dragging the stock

US hedge fund manager Bill Ackman, CEO of Pershing Square Capital Management, speaks during the 29th annual Milken Institute Global Conference at the Beverly Hilton in Beverly Hills, California on May 4, 2026. (Credit: Patrick T. Fallon / AFP via Getty Images)

Bill Ackman is going against the grain to back Microsoft.

Pershing Square Capital Management, the hedge fund run by the billionaire investor, has built a new position in the software giant.

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