Over the past 10 years, Bill Ackman returned 166.3% compared to 257.0% for the S&P 500 — underperformed the S&P 500 by 90.7%.
-4.4%
S&P 500: 15.3%
36.6%
S&P 500: 78.8%
16.3%
S&P 500: 75.8%
166.3%
S&P 500: 257.0%