Benzinga's Top #PreMarket Gainers By: Benzinga via Benzinga December 01, 2014 at 08:12 AM EST Groupon (NASDAQ: GRPN) shares jumped 4.78% to $7.89 in pre-market trading after Bank of America upgraded the stock from Neutral to Buy ... Read More >> Related Stocks: Groupon Cl A On Semiconductor Vnet Group Inc