After-Hours Buzz: GMCR, GRPN, ATVI & More By: CNBC.com News May 08, 2013 at 16:37 PM EDT Check out which companies are making headlines after the bell Wednesday: Read More >> Related Stocks: Activision Blizzard Ctrip.com Intl Ltd Groupon Cl A Microsoft Monster Beverage Tesla, Inc. Transocean Ltd