Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga April 29, 2014 at 08:21 AM EDT Gogo (NASDAQ: GOGO) dropped 18.66% to $14.95 in pre-market trading following news that AT&T (NYSE: T) intended to launch high-speed 4G ... Read More >> Related Stocks: AT&T Inc Ballard Power Sys Coach Gogo Inc