Benzinga's Top #PreMarket Losers

ImmunoGen IMGN dipped 5.43% to $12.90 in the pre-market session after the company announced a license agreement with Novartis. Morgan Stanley downgraded the stock from Equal-weight to Underweight. Cirrus Logic CRUS shares dropped 5.62% to $21.00 in pre-market trading. Cirrus Logic shares have dropped 27.88% over the past 52 weeks, while the S&P 500 index has gained 28.30% in the same period. Randgold Resources GOLD shares fell 1.72% to $75.28 in the pre-market trading. Randgold's PEG ratio is 6.04. Facebook FB dipped 0.78% to $47.16 after weak user data made investors nervous about the company's future.