Take a look at some of Thursday's midday movers:
Pandora Media - Shares of the provider of online music fell 3 percent on disappointing audience growth in February. The company is also going to stop providing monthly metrics.
Kroger - The supermarket operator rose 0.4 percent after projecting a higher-than-estimated full-year profit.
Ebay - The e-commerce company gained 1.3 percent after activist Carl Icahn told shareholders in a letter on Thursday that he has "not yet begun to fight" in his push to get the company to spin off its PayPal unit.
The Children's Place - The specialty apparel retailer fell 4.8 percent after posting weaker-than-expected fourth-quarter earnings and issued an outlook for the year below current consensus views.
Biogen Idec - Shares of the drug developer rose 2 percent after BMO Capital Markets raised its rating to outperform from market perform.
SodaStream International -The maker of home beverage carbonation systems advanced 3.1 percent after fund manager Whitney Tilson said he had a position in the stock.
Logitech International - The computer-peripherals maker gained 5.3 percent after hiking its earnings guidance and saying it would repurchase $250 million of its shares.
Lumber Liquidators Holdings - Shares fell 2.1 percent after Wedbush downgraded the stock to neutral from outperform.
BJ's Restaurants - Shares jumped nearly 22 percent after Luxor Capitol Partners, which has a 12.4 percent stake in the restaurant operator, said it would nominate five representatives to its board.
RadioShack - Shares of the struggling electronics retailer fell 6 percent after Goldman Sachs cut its price target and maintained its sell rating.
Sangamo BioSciences - Shares rallied 21 percent after data from its study showed that a gene therapy yielded positive results in treating HIV.
Energy Recovery - Shares rose 42 percent after the maker of devices used to harness reusable energy reported better-than-expected fourth-quarter profit.
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—By CNBC's Rich Fisherman.
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