Take a look at some of Friday's midday movers:
Herbalife, Nu Skin Enterprises and USANA Health Sciences all fell after the FTC said it would hold a news conference next Tuesday to announce an initiative against deceptive advertising of weight-loss products.
Sprint fell after S&P Capital IQ and Stifel Nicolaus downgraded the stock to sell from hold, saying that a potential merger with T-Mobile would have a hard time receiving regulatory approval.
Rite Aid gained after December same-store sales rose nearly 3 percent.
Delta Air Lines climbed after it reported increased load factors for December.
Exelon fell after Citi Investment Research cut its rating on the utility to sell from neutral.
Finisar rose after Raymond James upgraded the stock to strong buy from outperform.
(Read More: See CNBC's Market Insider Blog)
s—By CNBC's Rich Fisherman.
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