Vetr Top Raters Upgrade Groupon To 4.5-Star Stock By: Benzinga via Benzinga February 03, 2016 at 12:01 PM EST Shares of Groupon Inc (NASDAQ: GRPN) have lost more than 20 percent since the start of 2016 and are lower by nearly 70 percent over the ... Read More >> Related Stocks: Groupon Cl A