Bill Ackman's Pershing Square Made Microsoft Its Largest AI Holding by Selling Alphabet. Here's the Thesis Behind the Switch.

Bill Ackman's Pershing Square Capital Management dumped its entire Alphabet stake and trimmed Amazon to make MSFT its largest AI holding, adding 553,000 shares valued at $2.3 billion—now 11.9% of the portfolio.

The thesis centers on free cash flow. Microsoft posted $19.6 billion in positive FCF in its most recent quarter, while both GOOG and AMZN reported negative free cash flow. Microsoft also delivered 18% revenue growth to $90 billion and hit $100 billion in annual Azure revenue run rate, cementing its lead in cloud infrastructure underpinning AI workloads.

Pershing's portfolio shift signals conviction that Microsoft's ability to convert AI investment into cash generation separates it from peers still burning capital to scale. The Azure milestone—$100 billion annualized—reflects enterprise adoption of OpenAI integration and AI-native cloud services. Ackman's firm exited GOOG entirely rather than trim, suggesting a fundamental concern over Alphabet's capital efficiency as AI spending intensifies.