 Billionaire investor Carl Icahn sold his final remaining stake in Herbalife, putting a close to the saga that fueled his long-standing feud with Bill Ackman. SEC filings from Thursday show that Icahn now holds 0 of the multi-level-marketing nutritional shake seller. In January, the activist investor reduced his share of the company to about 6 from 16 and sold 600 million of stock, saying that the company no longer needed his activism. 