Pandora rose despite an Albert Fried analyst saying there is no way Microsoft isn't going to buy the internet radio services provider.
Barnes & Noble rose after the company returned to profitability during the fourth quarter despite a 10 percent decline in overall revenue.
Plug Power moved higher after the fuel cell maker received a purchase order from Wal-Mart to power its electric lift truck fleets at 6 North American distribution centers. FuelCell and Ballard Power moved higher as well.
Anika Therapeutics soared after the FDA approved its drug to treat pain and improve joint mobility in patients with osteoarthritis of the knee.
Chesapeake Energy moved lower after it said it planned to cut drilling and well-completion costs by nearly $900 million in 2014. The company also reported weaker-than-expected earnings.
ExamWorks gained ground after the independent medical examinations provider reported a smaller than expected quarterly loss and forecast first quarter revenue above street views.
Delta Airlines moved higher. The carrier said it would now award frequent flier miles based on ticket prices rather than on distance traveled.
Middleby Corporation rose after the food processing equipment maker reported better-than-expected results.
Uti Worldwide plummeted after the logistics company said it had breached some debt covenants and would report a loss for the fourth quarter.
Sony gained ground. Its electronic unit said it would close 20 retail stores in the U.S. and cut 1,000 jobs as it tries to stem losses and regain market share.
Cablevision moved higher after the cable TV company said revenue rose 4.5 percent in its fourth quarter despite it losing 18 thousand video subscribers.
—By CNBC's Rich Fisherman.
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