Lions Gate Entertainment fell after its record-opening box office of 'The Hunger Games: Catching Fire' disappointed Wall Street's sky-high expectations.
DaVita HealthCare Partners and Fresenius Medical Care gained after the government axed a a proposed cut in payment rates for dialysis treatments.
Sears Holdings jumped on rumors it was exploring a sale of its Canadian stores, but came off session highs after a spokesperson for the retail chain denied the company's CEO was in talks to sell its interest in Sears Canada.
Cubist Pharmaceuticals gained after it said its experimental treatment for a type of urinary tract infection was as effective as an approved antibiotic.
ADT Corp fell after the home-security specialist said it would buy back more than 10 million shares owned by hedge-fund Corvex Management.
Biogen Idec continued to surged after a committee of the European Medicines Agency granted new active substance designation for its oral multiple sclerosis treatment.
Giant Interactive Group rose after the Chinese online-game developer received an offer to take it private from its chairman and an affiliate of Baring Private Equity Asia for about $2.8 billion, or $11.75 a share.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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