Take a look at some of Wednesday's midday movers:
Activision Blizzard - The video-game maker dropped after saying its Destiny franchise grossed more than $325 million worldwide in five days.
Dresser-Rand Group - The turbine maker spiked after Sulzer confirmed discussions with Dresser-Rand about a potential merger.
DuPont - The chemical conglomerate advanced as activist investor Nelson Peltz's Trian Fund Management called on the company to divide its high-growth businesses from those with robust cash flows.
Gilead Sciences - The biotech giant fell after saying its experimental drug to treat pancreatic cancer failed a mid-stage study.
Kellogg - The cereal maker declined after Societe Generale downgraded the stock to hold from buy.
Lennar - The home builder rose after reporting third-quarter earnings that beat estimates and as a monthly index of sentiment in the housing industry rose for a fourth straight month. Lennar competitors including D.R. Horton, KB Home and PulteGroup also climbed.
Nike - The sporting-goods maker edged higher as it suspended its contract with National Football League player Adrian Peterson, who faces child-abuse allegations.
Nucor - The steel maker rose after forecasting higher third-quarter profit. Competitors AK Steel Holding and Steel Dynamics also gained.
Rewalk Robotics - The Israeli medical-device maker fell as investors took profits three days after its spectacular debut.
Salix Pharmaceuticals - The maker of drugs for gastrointestinal disorders rose after Reuters reporting a group of investors had threatened to vote down a proposed deal to buy a unit of Cosmo Pharmaceuticals and instead want the company to sell itself.
Tokai Pharmaceuticals - The clinical-stage biopharmaceutical company soared in its market debut.
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—By CNBC's Rich Fisherman.
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