William Ackman, founder and CEO of Pershing Square Capital Management LP, speaks at the inaugural Robin Hood Investors Conference in New York City November 22, 2013. Herbalife Ltd shares rallied as ... more 
William Ackman, founder and CEO of Pershing Square Capital Management LP, speaks at the inaugural Robin Hood Investors Conference in New York City November 22, 2013. Herbalife Ltd shares rallied as much as 7 percent on Friday as investors rejected the latest salvo from Ackman, who insisted the company is nothing but a pyramid scheme, even though his short position based on that view has cost up to $500 million. REUTERS/Craig Warga/Robin Hood Foundation/Handout via Reuters (UNITED STATES - Tags: BUSINESS) ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. FOR EDITORIAL USE ONLY. NOT FOR SALE FOR MARKETING OR ADVERTISING CAMPAIGNS. THIS PICTURE IS DISTRIBUTED EXACTLY AS RECEIVED BY REUTERS, AS A SERVICE TO CLIENTS. NO SALES. NO ARCHIVES less 
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Reuters | Photo By HANDOUT / REUTERS
Fri, Nov 22, 2013 4:01 PM EST