Herbalife Drops After Activist Investor Bill Ackman Says He's Shorting Stock

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William 'Bill' Ackman, founder and chief executive officer of... News PhotoBill Ackman,CEO,Finance,Financial Occupation,Founder,Healthy Eating,Horizontal,Investment,Merchandise,New York City,North,North America,Talking,The Americas,The Media,USAPhotographer Collection: Bloomberg 2012 BloombergWilliam 'Bill' Ackman, founder and chief executive officer of Pershing Square Capital Management LP, pauses while speaking during a presentation in New York, U.S., on Thursday, Dec. 20, 2012. Herbalife Ltd., the maker of namesake nutritional and weight-loss supplements, fell for the second day after Ackman said he has taken a short position on the company. Photographer: Scott Eells/Bloomberg via Getty Images