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August 24, 2026 · PDUFA decision

BIIB PDUFA decision: a negative outcome, -8.2%

On August 24, 2026, Biogen Inc. reached its PDUFA decision. The result was a negative outcome, and the stock moved -8.2% in the window around the event.

The move

$209.03
1d before
$191.95
Event day
$197.24
1d after
$205.99
5d after

Pre-catalyst setup

-0.4%
30-day run-up
4163%
30-day volatility
1.7×
volume spike