Take a look at some of Wednesday's midday movers:
WellCare Health Plans - Shares of the health insurer fell after it reported weaker-than-expected fourth-quarter earnings.
Cliff Natural Resources - The miner gained after hedge fund Casablanca Capital, which holds about 5.2 percent of the company, named its preferred candidate for CEO, and said it plans to nominate enough new directors to form a majority on the company's board.
Thomson Reuters - The news and information company slid after reporting a larger-than-expected decline in fourth-quarter earnings.
Dr. Pepper Snapple Group - The soda company rose after better-than-expected quarterly earnings.
Lorillard - The tobacco company fell after posting fourth-quarter results that just missed expectations. Reynolds American, Philip Morris International and Altria Group also declined.
Green Mountain Coffee Roasters - The maker of Keurig coffee makers moved lower after TreeHouse Foods announced it had filed a lawsuit against GreenMountain, claiming it attempted to maintain an illegal monopoly with its single-serve coffee pods. Longbow Research downgraded the stock to neutral from buy.
Jive Software - The enterprise networking software vendor declined after projecting 2014 sales below estimates.
DaVita HealthCare Partners - The kidney dialysis provider rose after reporting better-than-expected fourth-quarter results.
Conversant - The internet advertising company jumped after reported fourth-quarter earnings grew 24 percent.
Seattle Genetics - The biotechnology company climbed after reporting fourth-quarter losses below estimates.
Ventrus Biosciences - Shares of the pharmaceutical company fell sharply after it reported disappointing results from a trial of of a drug to treat anal fissures.
Crocs - The maker of colorful plastic shoes gained after Piper Jaffray upgraded the stock to overweight from neutral.
SeaDrill - The provider of offshore drilling services fell after Wells Fargo downgraded the stock to underperform from market perform.
AMCOL International - The minerals and materials group surged after French building-materials company Imerys said it would acquire the company for $1.6 billion including debt.
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—By CNBC's Rich Fisherman.
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