Amgen, AstraZeneca End Development Pact; Shares Sink By: Benzinga via Benzinga May 26, 2015 at 20:56 PM EDT Amgen, Inc. (NASDAQ: AMGN) shares lost about 2.8 percent Tuesday on fallout from the termination of a three-year-old development pact ... Read More >> Related Stocks: Amgen Astrazeneca Plc ADR UBS Group Ag ADR