New high · United States stocks
Biogen Inc. (BIIB) closes at a 52-week high of $243.10
Its third new 52-week high in 5 sessions. Up 7.9% over 20 sessions.
- Close
- $243.10
- On the day
- +4.1%
- Volume
- 1.2× average
- vs 52-week high
- New high
Biogen Inc. closing prices
The last 90 closes up to 20 October 2026. The live chart is on the BIIB page.
What happened
Biogen Inc. (BIIB) closed at $243.10 on 20 October 2026, up 4.1% from $233.48 the session before.
It was the second higher close in a row. It is the third new high in the last 5 sessions. Over 5 sessions the price is up 6.2%, and over 20 sessions it is up 7.9%.
That close is above every close of the past year. The previous highest was $235.35 on 15 Oct 2026, and the new close is 3.3% above it.
Volume was close to its recent average.
Across the 30 NASDAQ stocks we track, 11 closed higher and 19 closed lower that day, with a median change of −0.12%. BIIB's change was +4.1%.
This page reports what the price and volume data show. It does not say why the price moved.
The numbers
| Previous close | $233.48 |
|---|---|
| Close | $243.10 |
| Change on the day | +4.12% |
| Change over 5 sessions | +6.20% |
| Change over 20 sessions | +7.87% |
| Volume | 1.49 Million |
| Average volume, up to 20 sessions before | 1.25 Million |
| Volume against that average | 1.2 times |
| Highest close in the past year | $235.35 (15 Oct 2026) |
| Lowest close in the past year | $146.22 (21 Oct 2025) |
The full chart and history are on Biogen Inc. (BIIB). More from this market: NASDAQ news today.