Biogen Idec - The drug developer and rivals in the health care sector dropped, with Celgene, Alexion Pharmaceuticals and Gilead Sciences also sliding.
Pandora Media - The online radio surged after regulatory filings showed its chairman and CEO had purchased 25,000 shares of the stock.
Movado Group - The watch maker fell after warning results for the final two quarters of the year would likely come in beneath estimates.
King Digital Entertainment - The supplier of interactive games rose after Tuesday's global debut of its Candy Crush Soda Saga.
Virgin America - The airline soared in its market debut.
FibroGen - The drug developer rose in its market debut.
Graham Holdings - The education and media company rose after saying it would spin off its cable unit.
Barrick Gold - The miner and others including Newmont Mining, Goldcorp and AngloGold Ashanti rose with gold prices.
Ocwen Financial - The servicer and originator of mortgage loans fell a day after the Wall Street Journal reported it would not buy the rights to $39 billion in mortgages from Wells Fargo.
Puma Biotechnology - The drug developer declined after saying its experimental treatment for breast cancer failed a mid-stage study.
(See CNBC's Market Insider Blog)
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