Amgen Just Crashed 50% In Premarket, Here's How It Looked By: Benzinga via Benzinga December 16, 2014 at 09:55 AM EST Shares of Amgen, Inc. (NASDAQ: AMGN) just flash crashed in premarket trading on Tuesday. Shares crashed from $157.57 to $83.43, a ... Read More >> Related Stocks: Amgen