Groupon Shares Gain +7.8% On Piper Jaffray Analytics By: Benzinga via Benzinga June 23, 2014 at 14:15 PM EDT Shares of Groupon (NASDAQ: GRPN) jumped nearly eight percent following an Outperform reiteration by Piper Jaffray. Piper Jaffray ... Read More >> Related Stocks: Groupon Cl A