Billionaire investor Bill Ackman's Pershing Square Capital Management made a significant investment in Meta Platforms, acquiring $1.76 billion worth of shares in the fourth quarter of 2025. According to NS3.AI, this move coincided with the firm's complete exit from its stake in Chipotle Mexican Grill. Additionally, Pershing Square reduced its holdings in Alphabet, Uber, and Restaurant Brands International during the same period. These strategic adjustments indicate a shift in the firm's portfolio towards tech stocks, particularly Meta and Alphabet, despite the mixed performance trends in the sector.