Over the past 10 years, Bill Ackman returned 158.1% compared to 241.8% for the S&P 500 — underperformed the S&P 500 by 83.6%.
-4.4%
S&P 500: 16.0%
4.3%
S&P 500: 62.2%
11.4%
S&P 500: 67.5%
158.1%
S&P 500: 241.8%