Benzinga's Top Pre-Market Losers

Achillion Pharmaceuticals Inc ACHN moved down 7.09% to $10.75 in the pre-market session. Analysts at BofA/Merrill downgraded Achillion from “buy” to “underperform.” Colfax Corp CFX shares fell 6.03% to $31.46 in the pre-market trading. Colfax posted downbeat fourth-quarter results. Zoltek Companies Inc ZOLT dipped 4.66% to $13.90 in the pre-market session. ZOLT shares have dropped 6.36% over the past 52 weeks, while the S&P 500 index has gained 1.49% in the same period. Idenix Pharmaceuticals Inc IDIX dipped 4.15% to $11.55 in the pre-market session. IDIX's trailing-twelve-month operating margin is -459.53%.