How much would $1,000 invested in BIIB be worth today?

$1,000 invested in BIIB on October 27, 2016 would be worth $869 on October 27, 2026, with dividends reinvested — −1.4% a year compounded (CAGR).

How far back does the BIIB calculator go?

BIIB data begins September 17, 1991, with a close every session. Pick any start and end date in that span — 35 years, 1 month of history.

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.

If You Invested $1,000 in Biogen (BIIB): What It Would Be Worth Today

BIIB

$252.73+0.19%

as of close, Oct 27, 2026

☾ AH $252.73 +0.19%

Biogen Inc.Stock · HealthcareS&P 500 Equal Weight · 0.2% of RSPNasdaq Composite · 0.06% of ONEQS&P 500 · 0.05% of SPYRussell 1000 · 0.05% of IWBUS Stock Market · 0.04% of VTIRussell 3000 · 0.04% of IWVMSCI World · 0.03% of URTHMSCI ACWI · 0.03% of ACWI

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Your investment#

How much

All at once, on the start date

Pick start & end dates10 years

Start

Key dates

Start at a well-known dateRecentMarket topsMarket bottomsEvents

Bought at that day's close

End

Key dates

End at a well-known dateMarket topsMarket bottomsEvents

Latest close, Oct 27, 2026

Or drag the slider to set start and end dates

1991 to today, log scale

2008 crisisCovidDot-com bust

19952000200520102020Oct 2016Today

Options

Result#

$1,000Oct 27, 2016$869Oct 27, 20260.87×your money

$1,000 invested in BIIB on October 27, 2016 was worth $869 on October 27, 2026, with dividends reinvested.

That’s −1.4% a year compounded (CAGR) over 10 years: 0.87 times your money.

Over the same dates the same $1,000 would be worth $4,228 in the S&P 500 and $6,559 in the Nasdaq-100: BIIB trailed both the S&P 500 and the Nasdaq-100.

Price only$869if dividends were spent

Biggest fall−72.7%Jun 10, 2021 to Apr 10, 2025

At a flat 5% a year$1,629a savings account's rate

Loss$131on $1,000 put in

How this period ranks#

Better than 11% of all 302 periods of 10 years since 1991.

Your dates

−60%560%

Worst: −11.0% a year, Jun 2015 to Jun 2025Best: 68.8% a year, Dec 1994 to Dec 2004

One scale for every length, so longer periods bunch up. Point at a bar.

Growth of $1,000 in BIIB, October 27, 2016 to October 27, 2026#

Your $1,000$Your buySame plan in the S&P 500The highA low

Lowest value$390 · Apr 2025Highest value$1,426 · Jun 2021$745 · Mar 2019$885 · Apr 2018$848 · May 2017$

$0$2,000$3,000$4,000$869

20182020202220242026

How far BIIB was below its previous high. The biggest fall: −72.7% from Jun 10, 2021 to Apr 10, 2025, not back to the high by the end date.

−72.7% from its high−43.5% from its high−30.0% from its high−24.0% from its high

high−73%

Your one buy. $1,000 on October 27, 2016, worth $869 on October 27, 2026. Pick Monthly or Yearly to see a plan's buys.

paid0.87×

What $1,000 would be worth on October 27, 2026, by start date#

Each point is the same amount invested that day and held to October 27, 2026, dividends reinvested. Above the line it made money.

Your start

$1,000$3,000$10k$30k$100k$300k

1995200020052010201520202025

$1,000 invested in BIIB, by year#

Started on each year's first close and held to Oct 27, 2026, dividends reinvested.

Started	Worth Oct 27, 2026	Multiple	A year (CAGR)	Same in the Nasdaq-100
2017	$866	0.87×	−1.5%	$6,447
2018	$756	0.76×	−3.1%	$4,818
2019	$829	0.83×	−2.4%	$4,890
2020	$859	0.86×	−2.2%	$3,475
2021	$1,040	1.0×	0.7%	$2,411
2022	$1,035	1.0×	0.7%	$1,848
2023	$927	0.93×	−2.0%	$2,786
2024	$944	0.94×	−2.0%	$1,817
2025	$1,685	1.7×	33.3%	$1,426
2026	$1,421	1.4×	—	$1,180

Methodology#

A buy is made at the start date's close, or the next session's when the market was closed that day, and valued at the end date's close; a monthly or yearly plan buys on the same day of each month or year. "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 17, 1991; values as of October 27, 2026 and refresh daily. The ranking compares month-end to month-end periods. Past performance does not predict future returns; not investment advice.

See the live BIIB chart and fundamentals on the BIIB quote page or the S&P 500 return calculator.

FAQ#

How much would $1,000 invested in BIIB be worth today?: $1,000 invested in BIIB on October 27, 2016 would be worth $869 on October 27, 2026, with dividends reinvested — −1.4% a year compounded (CAGR).
How far back does the BIIB calculator go?: BIIB data begins September 17, 1991, with a close every session. Pick any start and end date in that span — 35 years, 1 month of history.
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.

BIIB return calculator