BIIB / STOCK · DATA AS OF 2026-10-29
If you invested $1,000
in Biogen
If you invested $1,000 in Biogen 10 years ago (2016-10), it would be worth $891.03 as of 2026-10-29, with dividends reinvested.
Biogen: the long view
| $1,000 invested | Actual start | Value today | CAGR |
|---|---|---|---|
| 1 years ago | 2025-10 | $1,618.27 | 61.83% |
| 3 years ago | 2023-10 | $1,050.98 | 1.67% |
| 5 years ago | 2021-10 | $936.14 | -1.31% |
| 10 years ago | 2016-10 | $891.03 | -1.15% |
| 15 years ago | 2011-10 | $2,145.50 | 5.22% |
| 20 years ago | 2006-10 | $5,244.75 | 8.64% |
| First month covered here | 1991-10 | $80,967.57 | 13.38% |
Dividends reinvested. Requested periods use the latest available month as their endpoint; shorter histories start at the first available month.
A little, every month
Investing $100 at each monthly close after the starting month (2016-10), with no initial lump sum, would turn $12,000.00 contributed into $12,773.07. Contributions start the following month.
Against the benchmark
Over 2016-10 to 2026-10, $1,000 in Biogen became $891.03; $1,000 in SPY became $4,238.51 with dividends reinvested.
Your questions, answered
What would $1,000 invested in Biogen 10 years ago be worth?
If you invested $1,000 in Biogen 10 years ago (2016-10), it would be worth $891.03 as of 2026-10-29, with dividends reinvested.
How would $100 a month in Biogen have performed?
Investing $100 at each monthly close after the starting month (2016-10), with no initial lump sum, would turn $12,000.00 contributed into $12,773.07. Contributions start the following month.
How does this compare with the S&P 500?
Over 2016-10 to 2026-10, $1,000 in Biogen became $891.03; $1,000 in SPY became $4,238.51 with dividends reinvested.
How much would $1,000 in Biogen in 2006 be worth today?
$1,000 invested in Biogen at the January 2006 close would be worth $5,578.77 as of October 29, 2026, with dividends reinvested.