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Biogen Inc. (BIIB)
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Biogen Inc. (BIIB) Shares Outstanding: 0.15

Is Biogen Inc.’s shares outstanding high or low?

Biogen Inc.'s shares outstanding of 0.15 is in line with its 5-year average of 0.15, near the low end of its 5-year range (0.14–0.16).

The shares outstanding for Biogen Inc. (BIIB) is 0.15. It is above its 12-month average by 0.34% (0.15).

BIIB Shares Outstanding Chart

BIIB Shares Outstanding
0.15+0.69% 1Y
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BIIB Average Shares Outstanding Chart

BIIB Current vs Average Shares Outstanding Chart

BIIB Shares Outstanding Metrics

SHARES OUTSTANDING

0.15

SHARES OUTSTANDING AVG TTM

0.15

SHARES OUTSTANDING AVG 3Y

0.15

SHARES OUTSTANDING AVG 5Y

0.15

SHARES OUTSTANDING AVG 10Y

0.18

SHARES OUTSTANDING AVG 15Y

0.20

SHARES OUTSTANDING AVG 20Y

0.22

CURRENT VS TTM AVG

+0.34%

CURRENT VS 3Y AVG

+0.76%

CURRENT VS 5Y AVG

-1.37%

CURRENT VS 10Y AVG

-17.08%

CURRENT VS 15Y AVG

-25.53%

CURRENT VS 20Y AVG

-34.75%

Share Structure

Shares Outstanding

146.70M

Float Shares

N/A

Stock Price

$199.10

Market Cap

$29.4B

Annual Shares Outstanding History

YearWeighted Average SharesYoY Change
2025146.70M+0.69%
2024145.70M+0.69%
2023144.70M-0.41%
2022145.30M-2.55%
2021149.10M-7.33%
2020160.90M-14.00%
2019187.10M-8.69%
2018204.90M-3.62%
2017212.60M-2.66%
2016218.40M-5.33%
2015230.70M-2.39%
2014236.36M-0.24%
2013236.92M-0.43%
2012237.94M-1.84%
2011242.40M-3.93%
2010252.31M-12.20%
2009287.36M-1.70%
2008292.33M-7.44%
2007315.84M-6.72%
2006338.58M+0.89%
2005335.59M+0.18%
2004335.00M+0.39%
2003333.70M-14.43%
2002389.96M+0.00%
2001389.96M-12.61%
2000446.23M-0.79%
1999449.76M-49.15%
1998884.52M+0.75%
1997877.89M+3.28%
1996850.00M-

Relationship: Market Cap = Shares Outstanding × Stock Price

Key concepts:

  • Float shares: Shares available for public trading
  • Dilution: When new shares are issued, existing shareholders own less
  • Buybacks: Reduce share count, increasing EPS and ownership stake
  • Stock splits: Increase share count but don't change market cap

Biogen Inc. Shares Outstanding Formula & Definition

Shares Outstanding represents the total number of shares issued by a company that are held by all shareholders. Changes in share count affect EPS and ownership dilution.

Expanded definitions: Investopedia, Wikipedia, Corporate Finance Institute

Biogen Inc. Shares Outstanding FAQ

What is the shares outstanding for Biogen Inc. (BIIB)?
The shares outstanding for BIIB stock is 0.15.
Is Biogen Inc.'s shares outstanding high or low?
Biogen Inc.'s shares outstanding of 0.15 is in line with its 5-year average of 0.15, near the low end of its 5-year range (0.14–0.16).
What is the TTM average shares outstanding for Biogen Inc. (BIIB)?
The TTM average shares outstanding for BIIB stock is 0.15.
What is the 3Y average shares outstanding for Biogen Inc. (BIIB)?
The 3Y average shares outstanding for BIIB stock is 0.15.
What is the 5Y average shares outstanding for Biogen Inc. (BIIB)?
The 5Y average shares outstanding for BIIB stock is 0.15.
What is the 10Y average shares outstanding for Biogen Inc. (BIIB)?
The 10Y average shares outstanding for BIIB stock is 0.18.
What is the 15Y average shares outstanding for Biogen Inc. (BIIB)?
The 15Y average shares outstanding for BIIB stock is 0.20.
What is the 20Y average shares outstanding for Biogen Inc. (BIIB)?
The 20Y average shares outstanding for BIIB stock is 0.22.

Biogen Inc. Shares Outstanding History

DATESHARES OUTSTANDING
2025-12-310.15
2024-12-310.15
2023-12-310.14
2022-12-310.15
2021-12-310.15
2020-12-310.16
2019-12-310.19
2018-12-310.20
2017-12-310.21
2016-12-310.22
2015-12-310.23
2014-12-310.24
2013-12-310.24
2012-12-310.24
2011-12-310.24
2010-12-310.25
2009-12-310.29
2008-12-310.29
2007-12-310.32
2006-12-310.34
2005-12-310.34
2004-12-310.33
2003-12-310.33
2002-12-310.39
2001-12-310.39
2000-12-310.45
1999-12-310.45
1998-12-310.88
1997-12-310.88
1996-12-310.85

About Biogen Inc.

Biogen Inc. is a leading biotechnology firm dedicated to the discovery, development, production, and distribution of treatments for complex neurological and neurodegenerative conditions. Its established portfolio includes a range of medications addressing multiple sclerosis (MS), such as TECFIDERA, VUMERITY, AVONEX, PLEGRIDY, TYSABRI, and FAMPYRA. For spinal muscular atrophy (SMA), Biogen provides SPINRAZA, while FUMADERM is available for the treatment of plaque psoriasis. Among its other key offerings is ADUHELM, specifically developed for Alzheimer's disease. The company also markets a selection of biosimilar drugs, including BENEPALI (an etanercept biosimilar akin to ENBREL), IMRALDI (an adalimumab biosimilar comparable to HUMIRA), and FLIXABI (an infliximab biosimilar referencing REMICADE). Further extending its therapeutic reach, Biogen supplies RITUXAN, prescribed for conditions like non-Hodgkin's lymphoma, chronic lymphocytic leukemia (CLL), rheumatoid arthritis, certain types of ANCA-associated vasculitis, and pemphigus vulgaris. RITUXAN HYCELA targets non-Hodgkin's lymphoma and CLL, and GAZYVA is utilized for CLL and follicular lymphoma. OCREVUS addresses both relapsing and primary progressive forms of MS, complementing the company's broader efforts in anti-CD20 therapies. The company maintains a robust research and development pipeline, featuring numerous investigational therapies. These candidates are designed to tackle a wide spectrum of conditions, including multiple sclerosis and neuroimmunological disorders (e.g., BIIB135, BIIB061, BIIB091, BIIB107), Alzheimer's disease and other forms of dementia (e.g., Aducanumab, Lecanemab, BIIB076, BIIB080), neuromuscular disorders (e.g., BIIB067, BIIB078, BIIB105, BIIB100, BIIB110), Parkinson's disease and related movement disorders (e.g., BIIB124, BIIB094, BIIB118, BIIB101, BIIB122), neuropsychiatric conditions (e.g., BIIB125, BIIB104), immunology-related illnesses (e.g., Dapirolizumab pegol, BIIB059), acute neurological events (e.g., BIIB093, BIIB131), and neuropathic pain (e.g., BIIB074). Additionally, several biosimilar candidates, such as BYOOVIZ, BIIB800, and SB15, are progressing through various developmental stages. Biogen actively engages in strategic collaborations and licensing arrangements with various partners, including Acorda Therapeutics, Inc., Alkermes Pharma Ireland Limited, Denali Therapeutics Inc., Eisai Co., Ltd., Genentech, Inc., Neurimmune SubOne AG, Ionis Pharmaceuticals, Inc., Samsung Bioepis Co., Ltd., Sangamo Therapeutics, Inc., and Sage Therapeutics, Inc. Established in 1978, Biogen Inc. maintains its corporate headquarters in Cambridge, Massachusetts.

Cambridge, MA
7,605 employees
Healthcare / Drug Manufacturers - General
Sector
Healthcare
Industry
Drug Manufacturers - General
CEO
Christopher A. Viehbacher