Benzinga's Top #PreMarket Losers

Whole Foods Market WFM dropped 16.68% to $39.95 in pre-market trading after the company reported weaker-than-expected fiscal second-quarter results and cut its guidance for 2014. Trimble Navigation TRMB dipped 12.23% to $33.50 in pre-market trading after the company reported downbeat Q1 results and issued a weak Q2 outlook. FireEye FEYE shares fell 12.07% to $32.65 in pre-market trading after the company reported a Q1 loss of $0.53 per share on revenue of $74.0 million and announced its plans to buy Npulse Technologies. Groupon GRPN shares dropped 7.74% to $6.20 in pre-market trading after the company issued a weak forecast. However, the company reported better-than-expected first-quarter results.