Over the past 10 years, Bill Ackman returned 172.5% compared to 259.7% for the S&P 500 — underperformed the S&P 500 by 87.2%.
6.0%
S&P 500: 14.5%
43.4%
S&P 500: 82.6%
15.3%
S&P 500: 69.9%
172.5%
S&P 500: 259.7%