The hedge fund battle over Herbalife intensified on Wednesday as George Soros has taken a large long position in the nutritional supplements maker, according to sources.
Soros' position in Herbalife is one of his top three holdings, sources said.
The hedge fund manager had no comment on the position.
This puts Soros on the side of billionaire investor Carl Icahn, who is also long the stock. Bill Ackman of Pershing Square Capital, meanwhile, is short the stock, telling CNBC earlier on Wednesday that he has not covered a single share of his $1 billion bet against the company.
The stock has increased about 60 percent since Ackman's Dec. 20, 2012, presentation in which he called the company a pyramid scheme-an accusation Herbalife has vehemently denied.
(Read more: Ackman to CNBC: I haven't covered Herbalife short )
Earlier this year, Icahn and Ackman slugged it out on live CNBC over Herbalife.
"I like Bill Ackman know," Icahn joked at the CNBC Delivering Alpha conference earlier this month. "Anyone who makes me a quarter billion dollars, I like."
The stock which was up 4.5 percent before the news, briefly spiked 10 percent immediately afterwards.
-Reporting by CNBC's Scott Wapner.