Shares of Herbalife Nutrition Ltd. fell 2.1% in morning trading Wednesday, after billionaire activist investor Carl Icahn said his Icahn Enterprises L.P. sold 14.7 million of the nutritional supplements company’s shares, which reduced its stake in the company by about 42%. Icahn said the stock sale was part of Herbalife’s self-tender offer, in which it accepts to buy back up to $750 million worth of its shares at $48.75 each. At that price, the 14.7 million shares Icahn sold would be valued at $716.6 million. Icahn Enterprises’ stock rose 1.3% in morning trading. Icahn remains Herbalife’s largest shareholder with about 20.5 million shares, or 15.5% of the shares outstanding. Herbalife’s stock has dropped 8.6% amid a four-day losing streak, since it closed at a 14-month high of $52.63 on Aug. 6. The stock has gained 0.8% year to date, while the S&P 500 has tacked on 4.3%.Market Pulse Stories are Rapid-fire, short news bursts on stocks and markets as they move. Visit MarketWatch.com for more information on this news.