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3/19/15: Shares of Herbalife Ltd. (NYSE: HLF) surged 12.5% on dismissal today of a lawsuit claiming the firm engaged in fraud and was a pyramid scheme. The weight-loss and nutritional products company has been under fire for two years from Bill Ackman and Pershing Square Capital Management. Ackman has been running a very public campaign against the firm and disclosed a $1 billion short position against HLF stock. Ackman and his fund are currently under investigation by the FBI over whether the fund and its manager manipulated HLF's stock price.