Midday movers: Twitter, Alcoa, Conns & more

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Take a look at some of Thursday's midday movers:

Amazon.com - The online retailer continued to fall, along and other momentum stocks, including Netflix, Priceline.com, Tesla Motors and Facebook. All are down more than 17 percent from their highs.

King Digital Entertainment - Shares fell for a second session after its market debut Wednesday. The mobile-game maker was the worst performing IPO this year.

Square 1 Financial - rose 12 percent in its market debut after pricing $5.7 million shares at $18.

TriNet Group - soared 16 percent in its first day of trading after the provider of payroll services offered 15 million shares at $16 a share.

Bitcoin Shop - The Bitcoin-only online retailer fell on reports China's central bank has ordered domestic banks to stop doing business with websites that trade in the digital currency.

GameStop - The seller of video-game products fell after reporting weaker-than-expected fourth-quarter earnings.

Twitter - The social-media company rose after entering a data-sharing partnership with Billboard.

Alcoa - The aluminum maker hit a two-and-a-half-year high after a favorable U.K. ruling that halted the London Metals Exchange's plans to cut industrial metal logjams in warehouses. The ruling was seen as supportive of aluminum prices.

Clovis Oncology - Shares experienced a roller coaster morning after it posted positive findings from a study of its lung-cancer treatment.

Conns - The specialty retailer gained after reporting earnings rose 57 percent in the fourth quarter.

Spherix - fell after it said it was suing Cisco Systems, alleging of patent infringement.

Fred's - The specialty retailer declined after reporting fourth-quarter earnings below estimates.

(Read More: See CNBC's Market Insider Blog)

—By CNBC's Rich Fisherman.

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