All charts and data below are CPI-U inflation-adjusted and with dividends reinvested. (Why?)
BIIB real return snapshot: after CPI-U inflation, BIIB returned +51.31% over the past year and +17.02% YTD, with dividends reinvested. Since Sep. 17, 1991, BIIB is up +2,684.94% in real purchasing-power return, or +10.00%/yr, and is currently −68.54% below its real total-return high on Mar. 20, 2015.
Data ending Tue Aug. 18, 2026
| Tue 1991-09-17💬 to Tue 2026-08-18 |
Overall
Return |
Exponential
Trendline |
||||
|---|---|---|---|---|---|---|
| BIIB × |
+2,684.94%
+10.00%/yr |
+15.36%/yr
R2=0.724 |
||||
| Biogen Inc NASDAQ Common Stock | ||||||
| Tue 1991-09-17💬 to Tue 2026-08-18 |
Start
Value |
End
Value |
|---|---|---|
| BIIB × |
$10,000.00
1991-09-17 |
$278,494.22
2026-08-18 |
| YTD | YoY | |
|---|---|---|
| BIIB × | +17.02% | +51.31% |
|
Current
Drawdown |
Worst
Drawdown |
|
|---|---|---|
| BIIB × |
−68.54%
on 2026-08-18 from 2015-03-20 peak |
−90.83%
on 1994-12-16 from 1991-10-16 peak |
| Period ending Tue 2026-08-18 | 1 yr | 2 yr | 3 yr | 5 yr | 10 yr |
|---|---|---|---|---|---|
| BIIB × | +51.31% |
−0.95% −0.48%/yr |
−25.42% −9.31%/yr |
−49.19% −12.66%/yr |
−51.17% −6.92%/yr |
| Year | BIIB |
|---|---|
| 2026 (YTD) | +17.02% |
| 2025 | +12.09% |
| 2024 | −42.56% |
| 2023 | −9.58% |
| 2022 | +8.41% |
| 2021 | −8.46% |
| 2020 | −18.59% |
| 2019 | −3.60% |
| 2018 | −7.31% |
| 2017 | +10.01% |
| 2016 | −9.31% |
| 2015 | −10.41% |
| 2014 | +20.51% |
| 2013 | +88.17% |
| 2012 | +30.74% |
| 2011 | +59.40% |
| 2010 | +23.48% |
| 2009 | +9.35% |
| 2008 | −16.40% |
| 2007 | +11.16% |
| 2006 | +5.97% |
| 2005 | −34.28% |
| 2004 | +75.78% |
| 2003 | +8.60% |
| 2002 | −53.00% |
| 2001 | +7.43% |
| 2000 | +86.61% |
| 1999 | +307.16% |
| 1998 | +34.56% |
| 1997 | +42.32% |
| 1996 | +17.88% |
| 1995 | +794.81% |
| 1994 | −64.00% |
| 1993 | −36.04% |
| 1992 | −34.59% |
| 1991 | −31.15% |
