Hard to beat the hedge fund compensation model of fee on the way up, fee on the way down. Agnostic to his Herbalife bet, Ackman "has widely underperformed the S&P 500 since its EOY 2012 inception: 7.1% since inception net of fees vs. 84% for the S&P 500. Their original flagship fund's (2004 inception) track record is outstanding with returns of ~20% per annum." So his first fund killed it, he made a name for himself,…
But why should the S&P 500 be the benchmark for what Ackman does? If he was advertising that he's betting on broad market risk it would make sense, but he's not. He's long/short high concentration, which you could argue he's also not done fantastic at, but with a small number of positions you'd expect a wide potential spread of returns.