Bill Ackman's hedge fund Pershing Square took a new position in Microsoft valued at $2.1 billion, disclosed on May 15, 2026. Ackman described Microsoft as a core holding of Pershing Square and said the company was offered at a highly compelling valuation [1, 2, 3].
Pershing Square's stake represents less than 0.1% of Microsoft's market value. Ackman announced the stake publicly in a post on X on May 15 and noted that the firm has followed Microsoft for many years [1, 2].
The new holding also appears in Pershing Square USA, Ackman's closed-end fund that launched on the New York Stock Exchange in late April 2026. This fund also took a position in Microsoft alongside the hedge fund [4, 3].
Ackman cited Microsoft’s 365 software suite, including Word and Excel, and the Azure cloud platform as among the most valuable franchises in enterprise technology. He highlighted Microsoft’s approximately 27% economic interest in OpenAI, which at OpenAI’s latest funding valuation is worth about $200 billion, or roughly 7% of Microsoft’s market capitalization [1, 3].
"Microsoft's valuation does not reflect the value of Microsoft's approximately 27% economic interest in OpenAI," Ackman said. He has previously invested in other tech giants such as Meta Platforms, Amazon, and Alphabet [4, 3].
Microsoft shares have fallen more than 15% so far in 2026 amid investor concerns over AI competition from Google and Amazon, making the current valuation attractive to Ackman [4].
Pershing Square initially prepared the SEC filing disclosing the new Microsoft position as of March 31, 2026. The closed-end fund debut on the NYSE followed in late April, with the public announcement issued May 15 [4, 2, 3].
