Bill Ackman, manager of the Pershing Square hedge fund, revealed a significant move in his investment portfolio by opening a new position in Microsoft ($MSFT) valued at $2.1 billion. The move was disclosed in a 13F filing for the quarter ended March 31, 2026. This represents a major vote of confidence in the tech giant, indicating potential for growth or an attractive valuation in Ackman's view.

The new investment in Microsoft coincides with Pershing Square's complete sale of its entire holding in Hilton Worldwide Holdings ($HILT), which was valued at approximately $870 million. Ackman is known for his concentrated approach and long-term investments in high-quality companies, and this move reinforces his belief in Microsoft's strength. It is important to remember that 13F filings are published with a delay of up to 45 days and reflect the portfolio's status at the end of the quarter, not necessarily the current positions.

For individual traders, such a move highlights how large hedge funds adjust their portfolios in light of changing market conditions and new opportunities. The entry of an investor of Ackman's caliber into a company like Microsoft can signal deep confidence in its technological leadership and business model, but this should not be seen as a recommendation, but rather as an indication of the thinking of big money.