Herbalife has a plan that could 'squeeze' hedge fund billionaire Bill Ackman

Hedge fund billionaire Bill Ackman's short position in Herbalife is looking awfully shaky. First and foremost, the company's surging stock — up 11% over two days after a report that it held talks to go private— has cost the Ackman-led Pershing Square Capital Management roughly $115 million on a mark-to-market basis, according to data compiled by the financial-analytics provider S3 Partners. And Ackman could be in for more pain because of Herbalife's decision to execute a so-called modified D...