Carl Icahn put even more of his money where his mouth is when it comes to Herbalife (HLF).The billionaire said Friday he bought 2.3 million more shares in the nutritional supplement company after a rival hinted that Icahn actually had been trying to sell shares.Icahn was already the largest-single owner of shares in Herbalife. He had 17 million shares, or 18.3% of shares, outstanding, says S&P Global Market Intelligence. The additional purchase puts his stake at 19.3 million, more than double the shares held by the second-largest investor, Fidelity, with 7.4 million shares.

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