Talisman Energy rose after the Canadian oil-and-gas company put two directors backed by Carl Icahn on its board, with the billionaire investor increasing his stake in the company.
WebMD jumped after Goldman Sachs raised its rating to neutral from sell, saying there are indications the online provider of medical information was starting to monetize its mobile inventory with higher-value pharmaceutical advertisers.
Groupon, OpenTable and Trulia fell after Goldman cut its view on their sector to neutral from attractive, citing valuation.
Cabela's climbed after Stifel Nicolaus upgraded the outdoor-goods provider to buy from hold.
Sprint slid after Macquarie downgraded the telecommunications company to neutral from outperform.
Marathon Petroleum rose after Deutsche Bank upgraded the stock to buy from hold.
Akamai Technologies fell on news it was buying cyber-security provider Prolexic Technologies for $370 million.
Biogen Idec gained after it said the Food and Drug Administration extended its review of a a drug to treat hemophilia.
Yamana Gold, Barrick Gold, Goldcorp, AngloGold and Newmont Mining all fell as gold futures dropped below $1,230 an ounce.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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