Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga April 10, 2014 at 08:22 AM EDT Imperva (NYSE: IMPV) fell 33.96% to $32.84 in pre-market trading after the company cut its first-quarter outlook. Imperva now expected a ... Read More >> Related Stocks: Bed Bath & Beyond Family Dollar Stores Fireeye Inc