$1,000 in Biogen Inc. in 2009 → $4,652 today
If you'd invested $1,000 in Biogen Inc. (BIIB) on January 1, 2009 — at the December 2008 month-end close of $47.63 — and held to the latest close (2026-08-), you'd have $4,652. That's a +365.2% total return — trailing the S&P 500, where the same $1,000 became $8,534.
Nearby years: 2005 · 2006 · 2007 · 2008 · 2010 · 2011 · 2012 · 2013 all years →
FAQ
How much is $1,000 invested in BIIB in 2009 worth today?
$1,000 invested in Biogen Inc. (BIIB) at the month-end close of 2008-12- would be worth $4,652 at the latest month-end close (2026-08-), a total return of +365.2% with dividends reinvested.
Did $1,000 in BIIB in 2009 beat the market?
Over the same span, $1,000 in the S&P 500 index would be worth $8,534 — so Biogen Inc. (BIIB) trailed the index by +45.5%.
What does "month-end close" mean for this calculation?
The scenario invests at the December 2008 month-end close (the price entering 2009) and values the position at the most recent month-end close (2026-08-). Intra-month extremes are shown on the BIIB calculator page.
Is the 2009–2026 return in BIIB typical?
No single year is typical. BIIB's best calendar-year return since 1991 was about +818.1%, and its worst was -63.0%.
Methodology
Biogen Inc. (BIIB) total-return data from January 2009 through the latest month-end close (2026-08-).
The entry price is the 2008 December month-end close and the exit is the latest available month-end close, both from adjusted (split and dividend) Yahoo Finance historical data.
Month-end resolution, no taxes or fees, and history never guarantees the future. For exact-date precision (including buying at a panic low), use the BIIB calculator page.
Compute your own BIIB scenario
Data: Yahoo Finance. As of 2026-08-. Not financial advice.