Fairway Group Holdings - The fresh foods retailer fell after reporting weaker-than-expected third-quarter results and said its CEO would retire.
Lululemon Athletica - The maker of athletic apparel rose after RBC upgraded its stock to outperform.
Google - The search engine gained after Dow Jones Newswires and others reported it had purchased a 5.94 percent stake in Lenovo either before or on the same day it agreed to sell the handset maker Motorola to the technology company.
iRobot - The robot maker fell after JPMorgan downgraded the stock to underweight from neutral.
Yahoo - The internet search engine rose as Citi repeated a buy rating, based on valuation.
Sony - The electronic equipment maker gained as Jefferies upgraded the stock to buy.
Merck - Shares of the pharmaceutical company rose after it said it agreed to pay $100 million to resolve all U.S. product liability lawsuits involving its NuvaRing contraceptive device.
Halliburton - The provider of services to energy exploration companies rose after Goldman Sachs maintained a buy rating, based on valuation.
Arrowhead Research - The biopharmaceutical company climbed after Jefferies doubled its price target to $30 a share, following a positive meeting with management.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Rich Fisherman.
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