Bill Ackman Billionaire investor Bill Ackman has seen his fortune more than double in 2025, with Forbes estimating his net worth at $9.2 billion, up from $4.3 billion in 2024. The surge is largely driven by the exceptional performance of his hedge fund, Pershing Square Capital Management, and its publicly traded vehicle, Pershing Square Holdings (PSHZF). Ackman founded Pershing Square Capital Management in 2004 and rose to fame for his short of bond insurer MBIA and his rescue of mall operator General Growth Properties. The hedge fund maintains a concentrated portfolio of 10 stocks, including Chipotle, Uber, and Amazon. Political...