Benzinga's Top Pre-Market Losers

Rigel Pharmaceuticals

shares dropped 17.36% to $3 in pre-market trading after the company reported that its R343 did not meet the primary endpoint in asthma study. Kraft Foods Group

shares fell 2.10% to $51.71 in the pre-market trading. Kraft Foods has a PEG ratio of 2.91. Tyson Foods

dipped 1.52% to $31.00 in the pre-market session after analysts at Bank of America downgraded the stock from “buy” to “neutral.” Windstream

dipped 1.46% to $8.10 in the pre-market session. Windstream shares have dropped 14.82% over the past 52 weeks, while the S&P 500 index has gained 17.94% in the same period.