Chipotle Mexican Grill gained ground. The casual restaurant chain raised its full-year sales forecast after reporting better-than-expected quarterly revenue.
Netflix climbed after Pacific Crest upgraded the stock to outperform from sector perform on expectations the company's international growth will accelerate over the next 18 months.
Barnes & Noble fell on news Chairman Leonard Riggio sold 3.7 million shares, reducing his stake in the company to 20 percent.
Teva Pharmaceuticals Industries rose after it settled its Celebrex patent lawsuit with Pfizer, paving the way for it to start selling a generic version in December.
Western Union, Moneygram International and Xoom all moved lower after Wal-Mart Stores said it would launch a domestic money transfer service. Euronet Worldwide, which will run Wal-Mart's new service, gained.
Gogo gained after JPMorgan upgraded the stock to overweight, citing the company's recent stock pullback.
Aspen Insurance fell after adopting a poison pill provision.
Twitter rose after Adweek reported it released a mobile advertising product that will allow app developers to encourage downloads of their programs.
Honeywell International moved lower after reporting mixed first-quarter results. It beat street forecasts on earnings but fell short of revenue forecasts.
UnitedHealth Group fell after it said it has spent more than $100 million to cover the new hepatitis C drug from Gilead Sciences. Rivals WellPoint and Aetna also dropped.
—By CNBC's Rich Fisherman.
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