Hedge-fund manager Bill Ackman is short the nutritional-supplement seller Herbalife, according to someone familiar with the matter, and has told people he considers the business to be little more than a "pyramid scheme."
Ackman, founder of the $11 billion hedge-fund company Pershing Square Capital Management, put on the bearish Herbalife position about seven or eight months ago, according to the person familiar with the matter, and has spent about a year researching the company.
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