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.