Take a look at some of Wednesday's midday movers:
ConAgra Foods - The maker of Hunt's tomato ketchup and Slim Jim beef jerky fell sharply after estimating an adjusted quarterly profit below its forecast.
Endocyte - The drug developer fell after saying Merck would no longer pursue the development of its cancer drug.
EnteroMedics - The company climbed after saying an FDA panel voted in favor of its obesity device.
Foresight Energy - The company fell in its market debut after pricing 17.5 million shares at $20 apiece.
General Electric - The conglomerate fell after Reuters cited a source in saying GE would make an improved offer for the energy unit of France's Alstom on Thursday.
General Motors - The automaker declined after being hit with a $10 billion lawsuit saying ignition switch recalls damaged the brand. Members of a House panel on Wednesday grilled GM CEO Mary Barra on the recall and defective switches blamed for at least 13 deaths.
GW Pharmaceuticals - The drug developer fell on its plants to sell 1.7 million ADR shares in a public offering.
Insmed - The biopharmaceutical soared after the Food and Drug Administration granted Breakthrough Therapy status to the company's only drug candidate, an inhaled antibiotic for lung infections.
Nokia - The Finnish telecom equipment company gained after it said it plans to buy back up to 370 million of its shares.
Public Service Enterprise Group - The utility and others including Northeast Utilities, Integrys Energy Group, AES and Sempra Energy moved higher as the Dow Jones Utility Index hit an intraday record high.
Shire - The biopharmaceutical company gained following a SunTrust note suggesting Allergan could bid for the company. Valeant Pharmaceuticals on Wednesday said it had launched a $53 billion hostile offer for Allergan, the maker of Botox.
Viper Energy Partners - The developer of oil and natural-gas properties jumped in its market debut after pricing 5 million shares at $26 a share.
Walgreen - The drugstore chain advanced after Barclays Capital raised its rating to overweight from equal weight.
Yelp - The online directory of local businesses rose after saying on its blog that users will now be able to message businesses directly.
ZS Pharma - The development stage biopharmaceutical company surged in its market debut after pricing nearly 6 million shares at $18 a share.
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—By CNBC's Rich Fisherman.
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