Take a look at some of Thursday's midday movers:
Amazon fell after Wal-Mart announced it would stop selling all Amazon Kindle products.
Questcor came off its highs after its COO reaffirmed that Aetna’s decision not cover its Acthar multiple sclerosis drug won’t have a material impact. The stock lost nearly half its value on Wednesday following the news.
Deckers Outdoorcontinued its slide on weak sales of its Ugg boots.
Green Mountain Coffee fell as Starbucks rolled out its Verismo-branded line of single-serve coffees.
Denbury Resources rose after ExxonMobil agreed to acquire the oil producer's Bakken Oil Shale assets for $1.6 billion.
Trulia soared on its Wall Street debut, opening more than 30 percent above its $17 IPO price.
Susser Petroleum also had a successful Wall Street debut, up as much as 14 percent above its $20.50 IPO price.
Laser stocks including Newport, Coherent and IPG Photonics all lost ground after Noble Financial downgraded the companies to "hold" from "buy," citing softening orders early next year.
St Jude Medical moved lower after Mizuho downgraded the medical device maker to "neutral" from "buy," citing concerns the company is losing market share in the implantable heart defibrillator market.
Jefferies lost ground following a tepid earnings report.
AllianceBernstein fell after Bank of America/Merrill Lynch cut its rating to "underperform" from "neutral," based on valuation.
—By CNBC's Rich Fisherman.
Questions? Comments? Email us at marketinsider@cnbc.com