As shares soar on higher sales. : It’s been a rough year for hedge fund titan Bill Ackman, whose firm Pershing Square has suffered three straight years of losses partly due to bad, high-profile bets on Valeant and Herbalife. But now that Chipotle’s stock has jumped 24% on Tuesday thanks to increased revenue and investor confidence in the company’s new CEO—there is something for Pershing to be relieved about. The rise in the Mexican fast-casual chains shares to $425 mean that Ackman’s near-10% stake in the company is no longer underwater.