Associated Press
FILE - This file photo combo of file photos shows Bill Ackman, left, of Pershing Square Capital Management, on Feb. 6, 2012, in Toronto, and financier Carl Icahn, on Feb. 7, 2006, in New York. A clash between Wall Street titans is flaring again Friday, Feb. 15, 2013 after Carl Icahn grabbed a 13 percent stake in Herbalife, a supplement company that Pershing Square Capital Management's William Ackman shorted heavily and very publicly, calling it a massive pyramid scheme. The filing, which was published late Thursday, sent shares of Herbalife soaring more than 20 percent before the opening bell Friday. (AP Photo/Pawel Dwulit, Shiho Fukada, File)

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