$202.19+$1.57 (+0.78%)as of market close, Jul 24, 2026
BIIB monthly returns
Biogen Inc. has averaged 2.10% per month, positive in 52% of months. Month-by-month returns for Biogen Inc. (BIIB) below, through July 24, 2026 — the table lists the most recent months; the bar chart plots the last 5 years.
Average month
+2.1%
415 months
Best month
+83.8%
Jun 2000
Worst month
-40.5%
Feb 2005
Positive months
52%
of all months
Biogen Inc. monthly returns#
| Month | Path | Total return |
|---|---|---|
| Jul 2026 | -7.0% | |
| Jun 2026 | +10.9% | |
| May 2026 | +3.6% | |
| Apr 2026 | +3.2% | |
| Mar 2026 | -4.4% | |
| Feb 2026 | +6.6% | |
| Jan 2026 | +2.2% | |
| Dec 2025 | -3.3% | |
| Nov 2025 | +18.0% | |
| Oct 2025 | +10.1% | |
| Sep 2025 | +5.9% | |
| Aug 2025 | +3.3% |
Monthly total return (since Aug 2021)
-30%-20%-10%+0%+10%+20%+30%
20222023202420252026
Methodology#
Monthly returns are total returns (dividends reinvested), computed from BIIB's split- and dividend-adjusted month-end closes. The table shows the most recent 120 months and the bar chart the most recent 60. 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 monthly return?
- Biogen Inc. (BIIB) has averaged about 2.10% per month, positive in roughly 52% of months. The best month was Jun 2000 (+83.8%) and the worst was Feb 2005 (-40.5%).