Take a look at some of Tuesday's midday movers:
Apple moved lower after disappointing investors with its quarterly earnings. But Carl Icahn tweeted that he's buying another $500 million worth of apple shares, bringing his total to $3.5 billion.
Abercrombie & Fitch gained on news the company was splitting its chairman and CEO roles and abandoning a plan aimed at blocking a hostile buyout. Mike Jefferies will continue to be chief executive, while Arthur Martinez has been appointed non-executive chairman.
Martin Marietta Materials rose after agreeing to buy Texas Industries for $2.06 billion in stock, or about $71.95 a share.
Polaris Industries fell after guiding 2014 sales and profits below street forecasts.
American Airlines Group moved higher after swinging to a fourth-quarter profit that topped street expectations.
Facebook climbed after Cowan retained its outperform rating and $68 price target ahead of the company's fourth-quarter earnings report Wednesday after the bell.
Vimpelcom slid after the Russian mobile firm said it would slash its dividend to pay down debt amassed in an aggressive expansion drive.
Rent-A-Center plummeted after posting weaker-than-expected quarterly earnings due to higher operating costs and weakness in domestic demand.
Tile Shop Holdings fell after it issued preliminary outlook targets that missed street expectations.
American International Group gained ground after Bank of America/Merrill Lynch added the stock to its U.S. 1 List.
AK Steel Holding moved higher after posting better-than-expected fourth-quarter earnings.
CIT Group fell after the lender reported a 37% drop in quarterly profit due to higher expenses.
Deutsche Bank boosted its price targets for Biogen Idec to $415 from $340; Celgene to $190 from $170; and Gilead Sciences to $132 from $95.
Oramed Pharmaceuticals rose for a second session as it gets set to report safety data in a clinical trial for its oral insulin medication later this week.
Check Point Software Technologies moved higher after reporting better-than-expected fourth-quarter earnings as license revenue rose for the first time in 18 months.
Waters gained after the maker of lab equipment posted better-than-expected fourth-quarter earnings on 10 percent organic growth.
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—By CNBC's Rich Fisherman.
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