Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga January 22, 2015 at 08:19 AM EST F5 Networks, Inc. (NASDAQ: FFIV) shares dropped 13.70% to $108.70 in pre-market trading after the company announced fiscal first ... Read More >> Related Stocks: American Express F5 Networks SanDisk Corp Xilinx