KB Home - The home builder dropped after saying it expects softer demand in the fourth quarter to dent gross margins. Lennar, DR Horton, PulteGroup and Toll Brothers also fell.
Merck & Co. - The pharmaceutical company gained after saying said it expects its experimental hepatitis C treatment to have favorable positions on the preferred drug lists of pharmacy benefit managers.
Pharmacyclics - The drug developer jumped after its initial fourth-quarter sales and 2015 guidance topped expectations.
Tilly's - The specialty retailer gained after raising its fourth-quarter earnings outlook above expectations.
Freeport-McMoRan - The miner slid as copper prices declined to a five-year low.
Goodyear Tire & Rubber - The company fell after lowering its 2014 earnings guidance.
Amazon.com - The online retailer edged higher after signing director Woody Allen to write and direct a television services for its video-streaming service. Citigroup also upgraded the stock to buy from neutral.
ChannelAdvisor - The software-as-a-service provider dropped after reducing its revenue estimate for the fourth quarter.
(See CNBC's Market Insider Blog)
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