Pre-market price movements and significant market activity for Biogen Inc. Common Stock ($BIIB). Each move is flagged by Z-score statistical significance — showing when $BIIB moved beyond its typical daily range. 3 significant moves detected in the last 30 days.
Current Market State
What May Be Driving BIIB?
UBS maintained a Buy rating and raised its price target on Biogen to $270.
Biogen Inc. Common Stock operates in the Healthcare sector, specifically Biotechnology. Sector-wide movement can contribute to individual stock volatility.
Recent Unusual Moves (30 days)
| Date | Session | Price | Move | Z-Score | Rel. Vol. |
|---|---|---|---|---|---|
| Oct 12, 2026 | Pre-market | $233.05 | +3.25% | 2.11 | 1.0× |
| Oct 9, 2026 | Regular | $225.71 | +3.33% | 2.68 | 0.5× |
| Oct 9, 2026 | After-hours | $225.71 | +3.33% | 2.68 | 0.7× |
About BIIB Premarket Movers
This page tracks unusual market activity for Biogen Inc. Common Stock (BIIB) across all trading sessions — pre-market (4:00 AM–9:30 AM ET), regular hours (9:30 AM–4:00 PM ET), and after-hours (4:00 PM–8:00 PM ET). A move is flagged as "unusual" when its Z-score reaches 2 or higher, meaning the price change is statistically significant relative to BIIB's recent daily volatility.
Z-score is calculated by comparing each move to the 20-day average return and standard deviation. A Z-score of 2.0 means the move is 2 standard deviations beyond the average — occurring in roughly the top 5% of daily moves. Relative volume (RVOL) compares current volume to the 20-day average volume at the same time of day, helping distinguish genuine institutional activity from noise.