Biogen Inc. trailing returns
Biogen Inc.'s 10-year annualized return is -3.1% per year (-26.7% cumulative). How Biogen Inc. (BIIB) has performed over the last day, week, month and year, over 5, 10 and 20 years, and since inception, through September 11, 2026 — cumulative and annualized, with dividends on or off.
Trailing returns by period#
To 2026-09-11. Annualized (CAGR) for windows of a year or more.
| Period | Path | Annualized | Cumulative |
|---|---|---|---|
| 1 day | — | +0.8% | |
| 1 week | — | -3.3% | |
| 1 month | — | +3.9% | |
| YTD | — | +23.4% | |
| 1 year | +52.2% | +52.2% | |
| 5 years | -6.3% | -27.6% | |
| 10 years | -3.1% | -26.7% | |
| 20 years | +8.3% | +393.3% | |
| Since inception (1991) | +12.9% | +6847.2% |
Growth of BIIB
Actual index level (solid); dashed lines are each window's constant-rate path from start to today.
Methodology#
Trailing returns measure from the closest close about N years before the latest close (2026-09-11). Cumulative return is the total change over the window; annualized return is the compound annual growth rate (CAGR), shown for windows of a year or more. Total return reinvests dividends (from BIIB's split- and dividend-adjusted closes); price return excludes them. See the year-by-year returns for the calendar breakdown. Past performance does not predict future returns; not investment advice.
FAQ#
- What is Biogen Inc.'s 10-year return?
- Over the last 10 years, Biogen Inc. (BIIB) returned about -3.1% a year annualized (-26.7% cumulative total return).
- What is Biogen Inc.'s 20-year annualized return?
- Over the last 20 years, Biogen Inc. (BIIB) compounded at about +8.3% a year (+393.3% cumulative).
- What is Biogen Inc.'s return since inception?
- Since 1991, Biogen Inc. (BIIB) has compounded at about +12.9% a year — +6847.2% in total.