Key Takeaways
- • Bill Ackman's Pershing Square initiated a new position in Microsoft, disclosing the stake via 13F filing on May 15, 2026, after the stock declined 16% year-to-date, characterizing it as a "compelling" valuation opportunity tied to artificial intelligence infrastructure investment.
- • Ackman began building the Microsoft position in February 2026 and views the company's $190 billion capital commitment in 2026 as necessary investment to drive future revenue growth, positioning Microsoft as an undervalued AI winner in the institutional investor landscape.
- • Pershing Square simultaneously exited its Alphabet (Google) position, representing a material reallocation of capital from one mega-cap technology holding to another within the fund's core portfolio.
- • The move reflects Ackman's thesis that Microsoft's valuation does not adequately reflect the revenue growth potential driven by its artificial intelligence and cloud infrastructure initiatives, despite the substantial near-term capital expenditure requirements.
Summary
Billionaire investor Bill Ackman announced on May 15, 2026, that Pershing Square Capital Management has established a new position in Microsoft, which will be formally disclosed in the fund's 13F quarterly filing submitted the same day. According to Ackman, Pershing Square began accumulating the Microsoft stake in February 2026, timing the entry during a period when the stock had experienced a 16% decline year-to-date. Ackman characterized the opportunity as offering a "compelling" valuation for one of the market's most dominant technology companies.
The investment thesis centers on Microsoft's artificial intelligence positioning and capital deployment strategy. Ackman emphasized that Microsoft's $190 billion capital expenditure commitment for 2026 represents a necessary investment to establish the infrastructure required for sustained revenue growth, rather than a burden on near-term profitability. This capital intensity, while pressuring the stock price in the near term, is viewed by Ackman as a competitive moat-building exercise that the market has undervalued. In public statements, Ackman noted that Pershing Square has monitored Microsoft for many years and found this pricing environment to offer genuine value for a company with Microsoft's dominance and AI exposure.
Concurrent with the Microsoft stake disclosure, Pershing Square exited its Alphabet (Google) position, reallocating capital within its portfolio of mega-cap technology holdings. This dual move—adding exposure to Microsoft while reducing exposure to Alphabet—signals Ackman's differentiated view on the relative valuations and artificial intelligence strategies of the two companies.
The 13F filing will disclose the specific size of the new Microsoft position, providing the investment community with precise capital deployment figures. The timing of this announcement and subsequent disclosure underscores Ackman's confidence in Microsoft's valuation and growth trajectory in an environment where large-cap technology stocks have experienced significant volatility.
The investment thesis centers on Microsoft's artificial intelligence positioning and capital deployment strategy. Ackman emphasized that Microsoft's $190 billion capital expenditure commitment for 2026 represents a necessary investment to establish the infrastructure required for sustained revenue growth, rather than a burden on near-term profitability. This capital intensity, while pressuring the stock price in the near term, is viewed by Ackman as a competitive moat-building exercise that the market has undervalued. In public statements, Ackman noted that Pershing Square has monitored Microsoft for many years and found this pricing environment to offer genuine value for a company with Microsoft's dominance and AI exposure.
Concurrent with the Microsoft stake disclosure, Pershing Square exited its Alphabet (Google) position, reallocating capital within its portfolio of mega-cap technology holdings. This dual move—adding exposure to Microsoft while reducing exposure to Alphabet—signals Ackman's differentiated view on the relative valuations and artificial intelligence strategies of the two companies.
The 13F filing will disclose the specific size of the new Microsoft position, providing the investment community with precise capital deployment figures. The timing of this announcement and subsequent disclosure underscores Ackman's confidence in Microsoft's valuation and growth trajectory in an environment where large-cap technology stocks have experienced significant volatility.
Go deeper than the headline
Research every firm in this story, track the ones that matter and get the daily briefing — free for 7 days.