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Midday movers: Merck & Co., GoPro Blackberry & more

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Scott Mlyn | CNBC

Take a look at some of Monday's midday movers:

Merck & Co. - The pharmaceutical giant fell after a mid-stage trial showed its attempt to shorten hepatitis C treatment to four weeks by adding Gilead's Sovaldi to its own treatment showed disappointing results. Gilead Sciences rose on the news.

Comcast - The company and other providers of internet services including Time Warner Cable, Charter Communications and Cablevision Systems fell after President Barack Obama took a strong stand on net neutrality.

GoPro - The maker of action cameras slumped after filing for an $800 million offering.

Sotheby's - The auctioneer gained after narrowing its third-quarter loss.

Abercrombie and Fitch - The teen retailer declined after Oppenheimer downgraded its shares to perform from outperform.

American Eagle Outfitters - The retailer dropped after B. Reilly & Co. downgraded its shares to neutral from buy.

Blackberry - The wireless-device maker rose after CEO John Chen told Bloomberg News he would be interested in possible partnerships to expand into China.

KB Home - The homebuilder and others including PulteGroup, DR Horton and Lennar advanced after Toll Brothers reported a surge in revenue last month.

Barrick Gold - The miner and others including Newmont Mining, AngloGold Ashanti and Goldcorp dropped with the price of gold.

Dean Foods - The dairy processor climbed after guiding fourth-quarter earnings higher.

Norfolk Southern - The railway gained after Morgan Stanley upgraded its shares to overweight from equal weight.

Exxon Mobil - The oil producer and others including Chevron, ConocoPhillips, Hess and Andarko Petroleum slid with the price of crude.

(See CNBC's Market Insider Blog)

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