2 Reasons Alnylam Stock Fell on a Landmark Drug Approval

You would think that when a drug company that's been working for 16 years to develop drugs using a novel therapeutic approach wins its first-ever approval from the U.S. Food and Drug Administration (FDA), confetti would fall from the ceiling and its investors would be celebrating a huge stock gain the next day. That didn't happen this week for shareholders of Alnylam Pharmaceuticals (NASDAQ:ALNY), with shares dropping 6.6% the day after the announcement, and there were two main reasons for that.