Key Takeaways
- • Bill Ackman's Pershing Square Capital Management has designated Microsoft as a core holding, disclosing a 5,654,078-share stake valued at approximately $2.1 billion, representing more than 14% of the fund's entire portfolio.
- • Pershing Square began accumulating Microsoft shares in February 2026 during a market sell-off, capitalizing on a decline in the technology company's stock price following its fiscal second-quarter earnings.
- • Ackman views Microsoft's artificial intelligence investments as significantly undervalued, specifically citing the company's OpenAI partnership, which he estimates at approximately $200 billion in value.
- • Pershing Square USA, a new closed-end fund that debuted on the NYSE in April 2026, has also designated Microsoft as a core holding, though it will not be subject to standard 13F regulatory filings.
Summary
Bill Ackman's Pershing Square Capital Management has elevated Microsoft to core holding status, marking a significant concentration of capital in the technology sector. The position consists of 5,654,078 shares valued at approximately $2.1 billion, accounting for more than 14% of Pershing Square's total portfolio according to regulatory disclosures made Friday. This represents a substantial bet by one of the investment industry's most prominent activist hedge fund managers on the technology giant's future performance.
The timing of Pershing Square's accumulation demonstrates disciplined opportunistic investing. Ackman disclosed that the fund began building its Microsoft position in February 2026, following a decline in the company's share price after its fiscal second-quarter earnings announcement. By entering during this period of weakness, Pershing Square secured the stake at more favorable valuations before the anticipated recovery.
Ackman's investment thesis centers on what he characterizes as significant undervaluation of Microsoft's artificial intelligence initiatives. Most notably, he points to Microsoft's partnership with OpenAI as a key value driver, estimating the partnership's value at approximately $200 billion. This valuation suggests Ackman believes the market has not fully priced in the strategic and financial benefits of Microsoft's positioning within the rapidly evolving AI landscape.
The core holding designation extends beyond Pershing Square's primary fund to the firm's newly launched closed-end fund, Pershing Square USA, which commenced trading on the NYSE in April 2026. This new vehicle has also made Microsoft a core position, broadening the firm's exposure across its investment vehicles. The closed-end fund structure provides Ackman with additional capital deployment flexibility while maintaining the core conviction in Microsoft's growth trajectory.
The timing of Pershing Square's accumulation demonstrates disciplined opportunistic investing. Ackman disclosed that the fund began building its Microsoft position in February 2026, following a decline in the company's share price after its fiscal second-quarter earnings announcement. By entering during this period of weakness, Pershing Square secured the stake at more favorable valuations before the anticipated recovery.
Ackman's investment thesis centers on what he characterizes as significant undervaluation of Microsoft's artificial intelligence initiatives. Most notably, he points to Microsoft's partnership with OpenAI as a key value driver, estimating the partnership's value at approximately $200 billion. This valuation suggests Ackman believes the market has not fully priced in the strategic and financial benefits of Microsoft's positioning within the rapidly evolving AI landscape.
The core holding designation extends beyond Pershing Square's primary fund to the firm's newly launched closed-end fund, Pershing Square USA, which commenced trading on the NYSE in April 2026. This new vehicle has also made Microsoft a core position, broadening the firm's exposure across its investment vehicles. The closed-end fund structure provides Ackman with additional capital deployment flexibility while maintaining the core conviction in Microsoft's growth trajectory.
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.