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Shares of nutritional marketing firm Herbalife Ltd. (NYSE: HLF) slumped more than 10% yesterday, hitting a 17-month low. The sell-off heated up in the final two hours of yesterday's trading session on unsupported rumors that a large shareholder had liquidated their positions. The continued decline in Herbalife is a victory for hedge fund manager Bill Ackman and Pershing Square Management given his huge short position against the firm. Ackman has long called the company's business practices a pyramid scheme, and the stock's downturn began after the Federal Trade Commission announced it was investigating the firm's practices.