Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga December 19, 2014 at 09:33 AM EST ImmunoGen, Inc. (NASDAQ: IMGN) shares dropped 45.30% to $5.94 after the company reported that Roche has provided an update on the ... Read More >> Related Stocks: Bellicum Pharmaceuticals Inc Immunogen Inc The Finish Line, Inc. - Class A Common Stock