Bill Ackman Buys Microsoft: A New $2B Bet on AI Dominance

Billionaire investor Bill Ackman has built a massive new stake in Microsoft. Discover why Pershing Square is betting heavily on the tech giant's discounted valuation and enterprise AI moat.

Shubham Agrawal
May 24th, 2026
Ackman and Microsoft handshake

Ackman and Microsoft handshake

NEW YORK - Billionaire investor Bill Ackman is making a massive, clear-cut move into the world’s leading software ecosystem.

According to Pershing Square Capital Management’s latest filings, Ackman has initiated a brand-new $2.09 billion position in Microsoft (MSFT). His fund snapped up over 5.6 million shares, instantly making Microsoft one of the largest holdings in his portfolio.

The bold entry comes at a fascinating time: Ackman completely emptied out his long-held stake in Google to fund this multi-billion dollar wager on its primary artificial intelligence rival.

Buying the Tech Dip

Ackman’s strategy is simple: buy a premium asset at a rare discount.

Pershing Square started buying shares after Microsoft's stock pulled back. Investors had panicked over a slight slowdown in Azure cloud growth paired with heavy spending on AI data centers.

While the broader market worried about the high cost of building AI infrastructure, Ackman saw a wide-open buying opportunity. With the stock trading well below its recent highs, he viewed the market’s fear as a green light to buy.

The Enterprise AI Moat

Ackman is actively pushing back against critics who worry about how fast AI will make money. For him, Microsoft has a competitive edge that rivals simply cannot touch.

The core of Ackman’s investment rests on three powerful pillars:

  1. Unrivaled Workplace Grip: The Microsoft 365 suite, now armed with the Copilot AI assistant, is deeply woven into the corporate world. It is incredibly hard for businesses to leave.
  2. Flexible Technology: Microsoft’s Azure cloud allows corporate clients to run multiple different AI models, giving businesses exactly what they need.
  3. The Infrastructure Lead: Instead of fearing Microsoft's massive spending on data centers, Ackman views it as essential fuel that will lock in long-term cloud revenue.

A Bold Shift on Wall Street

What makes Ackman’s multi-billion dollar Microsoft purchase even more compelling is how sharply it divides Wall Street.

While Pershing Square was aggressively buying Microsoft and exiting Google, other institutional giants did the exact opposite—slashing their Microsoft holdings to pivot toward Google. Ackman acknowledged the opposing views but reaffirmed his strong conviction in Microsoft's near-term advantage.

The Final Verdict

By making Microsoft its top purchase, Pershing Square is sending a clear message: the long-term fundamentals of the world’s largest software company are unshakable. Ackman isn’t waiting around for the AI hype to settle; he is betting that Microsoft’s enterprise dominance will ensure it wins the tech race, one corporate subscription at a time.

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