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Bill Ackman’s Pershing Square files a new ~$2.1bn Microsoft stake, arguing Azure and M365 are mispriced against AI noise
A Form 13F-HR filed 15 May 2026 for holdings as of 31 March 2026 shows Pershing Square Capital Management with about 5.65 million Microsoft shares worth roughly $2.09 billion, a new megacap line alongside sharply trimmed Alphabet; in a same-day post on X, Ackman framed Microsoft as a “highly compelling valuation” at about 21 times forward earnings, defended the OpenAI partnership economics against “overblown” exclusivity fears, and said buying began in February after weakness following Microsoft’s fiscal Q2 2026 results.
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