Zebra Technologies gained ground after the maker of specialty printers reported better than expected quarterly profits and sales. It also issued better earnings guidance for the current quarter than estimates.
Nabors Industries jumped after the land drilling contractor posted better than expected fourth quarter earnings on impressive gains from international operations.
Spirit Airlines took off after the airline posted better than expected fourth quarter earnings as net income grew 110 percent and unit costs fell.
Steel makers including US Steel, AK Steel, Northwest Pipe and Ternium all fell after the Department of Commerce declined to impose tariffs on South Korean steel pipes.
Meadowbrook Insurance fell after the insurer reported a surprise operating loss in its fourth quarter.
Six Flags moved higher after the theme park operator reported better than expected quarterly results, helped by higher admissions and in-park sponsorship.
Lumber Liquidators climbed after the hardwood flooring retailer posted better than expected fourth quarter results, helped by a 15.6-percent jump in same store sales.
Chelsea Therapeutics soared after U.S. regulators approved the company's drug to treat a rare low blood pressure disorder.
MGM Resorts gained ground after reporting better-than-expected fourth-quarter results.
Gogo moved higher as Everson Partners upgraded the stock to "overweight" from "equal weight" with a price target of $26 a share.
—By CNBC's Rich Fisherman.
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