If you invested $1,000 in BIIB — what it would be worth today
$1,000
once in
Dollar-cost averaging invests the same amount every period, so the chart compares value against what you put in.January 2016
Priced at a real closing price — the month's last trading day, or that exact day's close when you pick one.today
Monthly data: valued at the closing price on the last trading day of that month.A $1,000 investment in Biogen Inc. (BIIB) in January 2016 would be worth $795 as of September 2026 with dividends reinvested — -2.1% a year. Use the dropdowns above to try any amount or starting month back to September 1991.
Over the same period, the same $1,000 would be worth $4,680 in the S&P 500 (SPY) and $7,409 in the Nasdaq-100 (QQQ). BIIB trailed both the S&P 500 and the Nasdaq-100 over that period.
Growth of $1,000 in BIIB since January 2016— monthly
Biogen Inc. (BIIB). Total return approximated via dividend- and split-adjusted closes (no taxes or fees). Not investment advice.
What $1,000 in BIIB would be worth today, by starting month— each bar = one starting month, held to today
$1,000 invested in BIIB, by year— dividends reinvested, held to today
| Invested in | Worth today | Multiple | Annualized |
|---|---|---|---|
| 2016 | $795 | 0.8× | -2.1% |
| 2017 | $783 | 0.8× | -2.5% |
| 2018 | $624 | 0.6× | -5.3% |
| 2019 | $650 | 0.7× | -5.5% |
| 2020 | $808 | 0.8× | -3.2% |
| 2021 | $768 | 0.8× | -4.6% |
| 2022 | $961 | 1.0× | -0.9% |
| 2023 | $746 | 0.7× | -7.8% |
| 2024 | $880 | 0.9× | -4.8% |
| 2025 | $1,508 | 1.5× | 29.1% |
Methodology
Investments are assumed made at the chosen month's last trading day close, or that exact day's close when a day is picked. "Dividends reinvested" uses split- and dividend-adjusted closes (a standard total-return approximation; taxes and fees excluded). "Price-only" uses split-adjusted closes. BIIB data begins September 1991; values as of September 2026 and refresh daily. Past performance does not predict future returns; not investment advice.
See the live BIIB chart and fundamentals on the BIIB quote page or compare with the same investment in SPY.
FAQ#
- How much would $1,000 invested in BIIB be worth today?
- A $1,000 investment in Biogen Inc. (BIIB) in January 2016 would be worth about $795 as of September 2026, with dividends reinvested. That works out to about -2.1% a year.
- How far back does the BIIB calculation go?
- BIIB data begins September 1991. You can pick any starting month from then to the present and see what your investment would be worth today.
- Does this include dividends?
- Yes. The default "dividends reinvested" view uses split- and dividend-adjusted closing prices — a standard total-return approximation that excludes taxes and fees. A price-only view (split-adjusted, no dividends) is also available.