Take a look at some of Tuesday's midday movers:
At midday, all ten S&P 500 large-cap sectors are in the green. Bullish market comments from Appaloosa Management's David Tepper earlier Tuesday on CNBC cited as one reason for the rally.
Dell shares were lower after CNBC's David Faber reported that the computer maker will move up its earnings announcement to Thursday from Tuesday, May 21. Faber also reported that earnings per share are expected to be below expectations, according to sources.
Sodastream International shares were up sharply after a couple of analysts raised price targets on the home beverage carbonation company following its first ever analyst day.
The biggest gainer on the S&P 500 was Apollo Group after the private education service said that its University of Phoenix had received a letter from HLC Institutional Actions Council recommending reaffirmation of its accreditation for a ten-year period. The group also recommended notice status for two-years due to concerns cited in peer review team report.
Edwards Lifesciences shares were up after its board approved a new $750 million share repurchase program. The medical technology company also announced that CFO Thomas Abate would retire.
The price target on Yahoo was raised by a couple of brokers including Goldman Sachs and Cantor Fitzgerald. The Cantor analyst noted the acceleration in Alibaba's revenue growth as the reason for the move. Yahoo owns a stake in Alibaba, the Chinese internet search company.
(Read More: See CNBC's Market Insider Blog)
—By CNBC's Lori Spechler
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