Herbalife Ltd. signage is displayed outside of Herbalife Plaza in Torrance, California, U.S., on Monday, Feb. 3, 2014. Herbalife Ltd., the nutrition company hedge fund manager Bill Ackman has accused of being a pyramid scheme, boosted its share buyback by 50 percent to $1.5 billion and announced a $1 billion sale of convertible bonds. Photographer: Patrick T. Fallon/Bloomberg via Getty Images