GoPro - The maker of wearable cameras gained after Wedbush said it expects the company to top the high end of its revenue guidance for the fourth quarter.
Barnes & Noble - The book retailer rose after saying it had repurchased full ownership of its its Nook e-reader business, which it plans to spin off into a separate company.
Family Dollar Stores - The discount retailer edged higher after it adjourned a special shareholder meeting with insufficient votes to approve the proposed $8.5 billion buyout offer from Dollar Tree.
Achillion Pharmaceuticals - Shares of the company fell after Robert Baird downgraded the stock to neutral from outperform.
Church & Dwight - The maker of household products rose after BMO Capital upgraded the stock to outperform from market perform.
Radian Group - The mortgage insurer rose after saying it would sell its bond guaranty business to Assured Guaranty for $810 million.
Sierra Wireless - The wireless-equipment maker gained after Canaccord Genuity raised its price target to $53 from $36.
(See CNBC's Market Insider Blog)
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