Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga February 27, 2015 at 08:20 AM EST TubeMogul, Inc. (NASDAQ: TUBE) shares dropped 21.96% to $14.00 in pre-market after the company reported stronger-than-expected ... Read More >> Related Stocks: Del Frisco's Restrnt J C Penney Company Inc Potbelly Corp