Normal 0 false false false MicrosoftInternetExplorer4 Herbalife Ltd. (NASDAQ: HLF) shares plummeted 7.2% to $25.30 Monday after hedge-fund manger Bill Ackman of Pershing Square Capital Management last week revealed he had taken a huge short position in the stock. Herbalife plans to hold an analyst day Jan. 7 to dispute Ackman’s claims that the direct seller of nutrition products is a pyramid scheme. Share volume was just over a million, double its daily average /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;}