Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga February 13, 2015 at 08:18 AM EST Knowles Corporation (NYSE: KN) shares declined 21.26% to $17.04 in pre-market trading after the company reported downbeat Q4 results ... Read More >> Related Stocks: Ballard Power Sys ConAgra Foods Groupon Cl A Knowles Corp Zynga Inc Cl A