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BIOGEN INC. Shares Outstanding 2008-2025 | BIIB

Annual FY2008–FY2025 · quarterly through Q4 FY2025

Latest annual · FY2025

146.8M

+0.7%YoY vs FY2024Source: 10-KFY2025

From 288.0M in FY2008 to 146.8M in FY2025: 0.5× in 17 years.

By quarter▲▼ vs a year before
Fiscal yearQ1Q2Q3Q4
FY25Not reportedNot reportedNot reported147M+0.7%
FY24Not reportedNot reportedNot reported146M+0.6%
FY23Not reportedNot reportedNot reported145M+0.6%
FY22Not reportedNot reportedNot reported144M−2.0%
FY21Not reportedNot reportedNot reported147M−3.5%

Shaded by size: darkest is the largest quarter shown; ringed is the latest reported; a dash marks a quarter with no separate figure. Each quarter sits by its period-end date.

Key Statistics

Trend DirectionStable
CAGR

−0.7%

FY2020
152.4M
FY2025
146.8M

5 years selected · on the chart

01—History

Shares Outstanding History

Year-over-year comparison from 10-K annual reports

  18. 146.8M
YoY changeLargest recent move−12.5%in FY20Latest +0.7%

2 older moves run past ±20% (largest +87414.5%); point at, tap or drag across the bars to read one.

02—Ledger

Shares Outstanding, period by period

PeriodValueChangeSource
FY2025146.8M+0.7%10-K
FY2024145.8M+0.6%10-K
FY2023144.9M+0.6%10-K
FY2022144.0M−2.0%10-K
FY2021147.0M−3.5%10-K
FY2020152.4M−12.5%10-K
FY2019174.2M−11.7%10-K
FY2018197.2M−6.8%10-K
FY2017211.5M−2.0%10-K
FY2016215.9M−1.2%10-K
FY2015218.6M−6.8%10-K
FY2014234.6M−0.7%10-K
FY2013236.3M−0.1%10-K
FY2012236.6M−2.3%10-K
FY2011242.1M+0.7%10-K
FY2010240.5M+87414.5%10-K
FY2009274,855−99.9%10-K
FY2008288.0M—10-K

03—Questions

What is shares outstanding?

Shares outstanding is the total number of common shares currently held by all shareholders, including restricted shares.

What is BIOGEN INC.'s current shares outstanding?

BIOGEN INC. (BIIB) annual shares outstanding for 2025 was 146.8M, a 0.69% increase from 2024. BIOGEN INC. shares outstanding for the quarter ending December 31, 2025 was 146.8M.

What was BIOGEN INC.'s shares outstanding in 2024?

BIOGEN INC. annual shares outstanding for 2024 was 145.8M, a 0.62% increase from 2023.

What was BIOGEN INC.'s shares outstanding in 2023?

BIOGEN INC. annual shares outstanding for 2023 was 144.9M, a 0.63% increase from 2022.

What is BIOGEN INC.'s 5-year shares outstanding CAGR?

BIOGEN INC. shares outstanding grew at a compound annual growth rate (CAGR) of 0.75% from FY2020 to FY2025, going from 152.4M to 146.8M over 5 years.

Company
BIOGEN INC.
Ticker
BIIB
Sector
Healthcare
Industry
Biological Products, (No Diagnostic Substances)
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