Take a look at some of Thursday's midday movers:
GameStop - The video-game retailer's shares slid 6.6 percent after it a issued disappointing profit outlook for the current quarter and full year.
Dollar Tree - The retailer's shares declined 4.3 percent after it posted comparable sales rose less than estimated.
Transocean - The operator of an offshore-drilling fleet said its rigs next year would represent more than a third of those looking for work. Its shares were lately off 3.8 percent.
Target - The discount chain reported a tepid gain in quarterly comparable sand and cut its full-year profit forecast. Its shares fell 4.5 percent.
Micron Technology - Shares of the semiconductor company rose 5.3 percent after Greenlight Capital manager David Einhorn discussed holding a long position on CNBC.
Philip Morris - Goldman Sachs downgraded shares of the cigarette seller to neutral from conviction buy. Its shares declined 4.2 percent.
Johnson Controls - Shares jumped 4.9 percent after the maker of heating and ventilation systems increased its share-buyback program by $3 billion.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Kate Gibson.
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