Pershing Square Capital Management, the hedge fund run by billionaire Bill Ackman, added Microsoft as a core holding during the first quarter of 2026, betting that the software giant will be a winner in the artificial-intelligence race. Pershing Square held 11 U.S.-listed equity positions with a disclosed market value of about $13.71 billion by the end of the first quarter, according to the fund’s latest 13F filing, which was submitted to the Securities and Exchange Commission on Friday. The top holding was Brookfield , valued at roughly $2.42 billion; followed by Amazon valued at $2.39 billion; and Uber valued at $2.15 billion.