Take a look at some of Tuesday's midday movers:
Under Armour - Shares rose rose after the head of the United States Olympic Committee issued a statement saying said the suits were not the reason U.S. speed skaters did not perform better in the Sochi games.
Safeway - The grocer gained after Credit Suisse said the company might be exploring strategic alternatives.
Blackberry - Shares of the smartphone maker were up after Dan Loeb's Third Point hedge fund disclosed a 10 million share stake in the technology company. Separately, FBR Capital upgraded the stock to market perform from underperform and raised its price target to $10 from $6.75.
Twitter - Shares moved higher despite its lockup period ending for non-executive employees to sell their shares.
Kansas City Southern - Shares of the railroad fell after JPMorgan cut its rating to neutral from overweight on fears that pending legislation in Mexico becomes law and spurs increased completion. The firm cut its price target to $96 form $118.
Boeing - Shares of the plane manufacturer rose it said it had chosen Everett, Wash., as the site for a wing building plant.
Prana Biotechnology - Shares rose in heavy volume on news its experimental drug to treat a hereditary degenerative brain disorder met the main goals in a mid-stage study.
BHP Billiton - Shares rose after the global miner topped street forecasts with a 31 percent rise in first half profit. It also hinted it may launch a share buyback in August.
Sony - The electronics maker climbed after saying it sold more than 5 million Playstation 4 game consoles, surpassing its full-year target ahead of the release in Japan next week.
Duke Energy - Shares gained ground after the country's largest power company forecast full-year earnings above estimates.
Westlake Chemical - Shares jumped after the petrochemicals products maker announced a two-for-one stock split and increased its quarterly dividend by 12 percent to 25 cents a share.
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—By CNBC's Rich Fisherman.
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