The Bill Gates Foundation Trust sold its entire Microsoft (MSFT) stake in Q1 2026, offloading the final 7.7 million shares worth $3.2 billion. The exit caps a two-year wind-down from 28.5 million shares, funding Gates’ plan to spend the endowment by 2045. Microsoft stock slipped to $422.07 even as Pershing Square’s Bill Ackman disclosed a fresh $2.3 billion MSFT buy the same day.