Vetr Top Raters Upgrade Groupon To 4.5 Star Stock By: Benzinga via Benzinga January 21, 2016 at 11:45 AM EST Shares of Groupon Inc (NASDAQ: GRPN) have lost nearly 20 percent since the start of 2016 and are lower by more than 65 percent over the ... Read More >> Related Stocks: Groupon Cl A