Daily close, T-120 (10/3/24) through T+5. Run-up high $300.55 on 10/24/24, low $232.27 on 11/26/24 (T-120 to T-1). FDA decision 3/20/25. Historical price action, not a forecast.
Positioning before the decision
On Mar 6, 2025, 14 days before the decision date, at-the-money options priced a move of ±8.8% through Mar 21, 2025 (the first listed expiry after the decision; ATM implied volatility 54%). The stock closed +0.0% at the first close across the decision and +6.2% five trading days on. A straddle priced weeks out covers ordinary movement plus the event, so this is the move the options market priced through that expiry, not the event-implied move alone. How this compares across 1,000+ decisions.
Decision facts
FDA decision date2025-03-20
DrugAMVUTTRA (vutrisiran)
IndicationATTR Amyloidosis with Cardiomyopathy (ATTR-CM)
Yes. The FDA approved the application for AMVUTTRA (vutrisiran) on March 20, 2025. The primary source is linked on this page.
What was AMVUTTRA (vutrisiran) under FDA review for?
The application covered ATTR Amyloidosis with Cardiomyopathy (ATTR-CM). The FDA approved the application on March 20, 2025.
How did ALNY stock react to the FDA decision?
On the decision day ALNY moved +0.0%. That is the recorded reaction to this specific event -- historical measurement, not a prediction, and not investment advice.