Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga December 07, 2015 at 08:28 AM EST bluebird bio Inc (NASDAQ: BLUE) fell 31.02 percent to $57.71 in pre-market trading on mixed sickle cell data results presented at the ... Read More >> Related Stocks: Bluebird Bio Chesapeake Energy Chipotle Mexican Grill Global Blood Ther