$202.19+$1.57 (+0.78%)as of market close, Jul 24, 2026
BIIB weekly returns
Biogen Inc. has averaged 0.48% per week, positive in 52% of weeks. Week-by-week returns for Biogen Inc. (BIIB) below, through July 24, 2026 — the table lists the most recent weeks; the bar chart plots the last 2 years.
Average week
+0.5%
1818 weeks
Best week
+56.3%
Dec 23, 1999
Worst week
-44.2%
Mar 4, 2005
Positive weeks
52%
of all weeks
Biogen Inc. weekly returns#
| Week ending | Path | Total return |
|---|---|---|
| Jul 24, 2026 | -1.8% | |
| Jul 17, 2026 | +3.4% | |
| Jul 10, 2026 | -7.9% | |
| Jul 2, 2026 | +0.0% | |
| Jun 26, 2026 | +9.9% | |
| Jun 18, 2026 | -1.7% | |
| Jun 12, 2026 | +2.4% | |
| Jun 5, 2026 | -0.3% | |
| May 29, 2026 | +1.2% | |
| May 22, 2026 | +0.4% | |
| May 15, 2026 | -0.3% | |
| May 8, 2026 | +3.4% |
Weekly total return (since Aug 2, 2024)
-15%-10%-5%+0%+5%+10%+15%
20252026
Methodology#
Weekly returns are total returns (dividends reinvested), computed from BIIB's split- and dividend-adjusted weekly (ISO week) closes. The table shows the most recent 260 weeks and the bar chart the most recent 104. See the year-by-year returns for the annual view. Past performance does not predict future returns; not investment advice.
See also: S&P 500 · Nasdaq-100 · Dow Jones · Russell 2000 · US Bond Market · Gold · Silver · Bitcoin · Ethereum
FAQ
- What is Biogen Inc.'s average weekly return?
- Biogen Inc. (BIIB) has averaged about 0.48% per week, positive in roughly 52% of weeks. The best week was Dec 23, 1999 (+56.3%) and the worst was Mar 4, 2005 (-44.2%).