Biogen (BIIB) returns
Biogen returns over 10 years
$1,000 invested in Biogen ten years ago was worth $894.16 at the close on October 30, 2026, with dividends reinvested: an average return of -1.1% a year. The same $1,000 in the S&P 500 (SPY) became $4,166.
Total return by period
| Period | Total return | A year, on average | $1,000 became | S&P 500 (SPY) |
|---|---|---|---|---|
| 1 month | +12.3% | — | $1,123 | -0.9% |
| 3 months | +22.0% | — | $1,220 | +2.1% |
| Year to date | +44.1% | — | $1,441 | +11.7% |
| 1 year | +69.5% | — | $1,695 | +12.4% |
| 3 years | +6.9% | +2.3% | $1,069 | +88.5% |
| 5 years | -4.9% | -1.0% | $951.03 | +76.0% |
| 10 years | -10.6% | -1.1% | $894.16 | +316.6% |
Biogen return by calendar year
| Year | BIIB | S&P 500 (SPY) | Difference |
|---|---|---|---|
| 2026 to date | +44.1% | +11.7% | +32.4% |
| 2025 | +15.1% | +17.7% | -2.6% |
| 2024 | -40.9% | +24.9% | -65.8% |
| 2023 | -6.6% | +26.2% | -32.7% |
| 2022 | +15.4% | -18.2% | +33.6% |
| 2021 | -2.0% | +28.7% | -30.8% |
| 2020 | -17.5% | +18.4% | -35.9% |
| 2019 | -1.4% | +31.2% | -32.6% |
| 2018 | -5.5% | -4.6% | -1.0% |
| 2017 | +12.3% | +21.7% | -9.4% |
| 2016 | -7.4% | +12.0% | -19.4% |
Past returns do not predict future returns. Returns are computed from our daily closes, adjusted for splits and with dividends reinvested on their ex-dates; taxes and trading costs are left out.
See also: BIIB financials · BIIB valuation
No forecast, no recommendation. This page describes Biogen from published data; it is not advice to buy, sell or hold any security.
Figures as of the close on Oct 30, 2026 unless a row says otherwise. Prices are split adjusted; returns include dividends reinvested. Data may be delayed. See the disclaimer and how TrendArc works.