Take a look at some of Tuesday's midday movers:
Alibaba Group Holding - The Chinese supplier of online commerce was little moved after UBS began coverage with a buy rating.
Darden Restaurants - The Olive-Garden parent rose after naming Chief Operating Officer Gene Lee as interim CEO, replacing Clarence Otis.
GW Pharmaceuticals - The drug developer fell after releasing test results for one of its drugs targeting seizures in children and young adults.
Helmerich & Payne - The drilling company rose after FBR Capital Markets upgraded it to outperform from market perform.
JetBlue Airways - The carrier rallied, along with competitors including United Continental Holdings, Delta Air Lines and American Airlines Group as the Dow Jones Transportation Average had its best session in more than a year.
Lakeland Industries - The supplier of safety garments declined, as did rival Alpha Pro Tech after the World Health Organization said the number of Ebola cases in the worst-hit areas is dropping.
Macy's - The department-store retailer climbed after saying it would open at 6 p.m. on Thanksgiving.
Netflix - The supplier of online entertainment gained after BTIG upgraded the stock to buy from neutral.
NetScout Systems - The technology company fell after Wunderlich Securities downgraded it to hold from buy.
Orbitz Worldwide - The online-travel site rose after RBR Capital Markets upgraded it to outperform from market perform.
Signet Jewelers - The specialty jeweler fell after saying Chief Executive Officer Michael Barnes, had resigned, effective Oct. 31.
Skyworks Solutions - The provider of radio-frequency chips to companies including Apple advanced after hiking its fourth-quarter outlook.
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