U.S. markets are holding and adding to early gains on Wednesday after rebounding from Tuesday's loses. The Dow Jones Industrial is up triple digits. Amazon (AMZN) is leading the Nasdaq higher with more than 3% gains. The online retail giant unveiled a mobile credit card reader and app for businesses. Amazon's latest offering will compete with existing services like PayPal and Square. Brick and mortar retailers are struggling in today's session. Macy's (M) is down more than 4% after posting quarterly results which fell short of Wall Street forecasts. SeaWorld (SEAS) shares are down almost 30%. The theme park operator missed expectations and dropped its forecast for the year. Set to report earnings after Wednesday's close is Cisco (CSCO). The world's largest computer networking gear maker is expected to post results of 53 cents a share.