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Biogen BIIB

Biogen is the 284th largest S&P 500 company by market cap, worth $37.0 billion. 10 directors have filed with the SEC in the last 12 months (who counts), 1 of them an executive. 9 other officers are on file. At 30 Jun 2026, Fidelity (FMR) was its largest institutional holder, with 12.3% of the company.

CEO
Christopher Viehbacher
Sector
Health Care
Sub-industry
Biotechnology
Headquarters
Cambridge, Massachusetts
Founded
1978
More
Wikipedia
Market cap
$37.0B
284th largest, 23 Oct 2026 close
Revenue
$9.9B
Fiscal year 2025
Price to sales
3.8
Market cap over revenue
Employees
7,500
10-K, 31 Dec 2025
Market cap per employee
$4.9M
Market cap over employees
Connections
3
S&P 500 companies sharing a director or officer

Largest institutional holders

Each fund group's share of Biogen. Where a company has several share classes, the share is of its total value.

13F filings for the quarter to 30 Jun 2026

These five hold 50.5% of Biogen.

Source: SEC Form 13F data sets, SEC XBRL shares outstanding 路 All holders

Board and officers

3 people here also hold roles at other S&P 500 companies.

Roles filed up to 30 Sep 2026

NameTitle
Directors (10)
Christopher ViehbacherPresident and CEOLast filed 17 Feb 2026President and CEO
Maria C. FreireDirectorAlso at Alexandria Real Estate EquitiesDirector
William A. HawkinsDirectorDirector
Susan LangerDirectorDirector
Jesus B. MantasDirectorAlso at International Flavors & FragrancesDirector
Lloyd MinorDirectorDirector
Menelas N. PangalosDirectorDirector
Monish D. PatolawalaDirectorAlso at Archer Daniels MidlandDirector
Eric K. RowinskyDirectorDirector
Stephen A. SherwinDirectorDirector
Officers (9)
Robin KramerChief Financial OfficerLast filed 17 Feb 2026Chief Financial Officer
Sean GodboutChief Accounting OfficerLast filed 3 Apr 2026Chief Accounting Officer
Ginger GregoryEVP, Human ResourcesLast filed 17 Feb 2026EVP, Human Resources
Jane GroganHead of ResearchLast filed 17 Feb 2026Head of Research
Rachid IzzarHead of Global Product StratLast filed 17 Feb 2026Head of Global Product Strat
Adam KeeneyHead of Corporate DevelopmentLast filed 5 May 2026Head of Corporate Development
Nicole MurphyHead of Pharm Ops and TechLast filed 17 Feb 2026Head of Pharm Ops and Tech
Michael PariniChief Legal OfficerLast filed 3 Sep 2026Chief Legal Officer
Priya SinghalHead of DevelopmentLast filed 17 Feb 2026Head of Development

Source: SEC insider filings (Forms 3, 4 and 5), Biogen's Form 4 filings 路 All directors and officers

Companies that share people with Biogen

Each person's title here, then at the other company.

Source: SEC insider filings 路 See the whole network

Biogen's market cap since December 2008

Marked weeks are changes in the share count, such as a merger, not market moves.

Weekly, up to 23 Oct 2026

Show equal percentage changes as equal steps.
201020122014201620182020202220242026$37.0B

Source: Yahoo Finance closing prices, SEC XBRL shares outstanding

Workforce

Headcount at 31 Dec 2025

Employees
7,500
As of December 31, 2025, we had approximately 7,500 employees worldwide.
Biogen Form 10-K

Source: Biogen Form 10-K

Insider trades

Open-market buys and sales by directors and officers. Grants, option exercises and shares withheld for tax are left out.

Trades from 30 Sep 2025 to 30 Sep 2026

Directors and officers sold $905,414 of stock in 4 sales and bought $585 in 1 purchase in the 12 months to 30 Sep 2026.

DatePersonTitleTypeSharesValue
4 Aug 2026SaleLloyd MinorDirectorDirectorSale593$119K
3 Aug 2026SaleLloyd MinorDirectorDirectorSale593$121K
12 Feb 2026BuyNicole MurphyHead of Pharm Ops and TechHead of Pharm Ops and TechBuy3$585
9 Feb 2026SalePriya SinghalHead of DevelopmentHead of DevelopmentSale2,660$532K
2 Feb 2026SalePriya SinghalHead of DevelopmentHead of DevelopmentSale748$134K

Source: SEC insider transactions data sets, Biogen's Form 4 filings

Trades by members of Congress and officials

Trades members of Congress and senior executive branch officials disclosed, including their families'. Amounts are filed as ranges.

Trades from 20 Oct 2023 to 20 Oct 2026

7 people disclosed 15 purchases and 11 sales of Biogen stock since October 2023.

DateMember or officialTypeAmount
24 Sep 2026Maria Elvira Salazar (House, R-FL)House, R-FL 路 SoldSale$1,001 to $15,000$1K to $15K
4 Sep 2026Rohit Khanna (House, D-CA)House, D-CA 路 BoughtPurchase$1,001 to $15,000$1K to $15K
18 Aug 2026Kevin Hern (House, R-OK)House, R-OK 路 SoldSale$1,001 to $15,000$1K to $15K
12 Jun 2026Donald J Trump (President)President 路 SoldSale$1,001 to $15,000$1K to $15K
5 Jun 2026Gilbert Cisneros (House, D-CA)House, D-CA 路 BoughtPurchase$1,001 to $15,000$1K to $15K
2 Jun 2026Maria Elvira Salazar (House, R-FL)House, R-FL 路 SoldSale$15,001 to $50,000$15K to $50K
12 May 2026Maria Elvira Salazar (House, R-FL)House, R-FL 路 BoughtPurchase$1,001 to $15,000$1K to $15K
11 May 2026Maria Elvira Salazar (House, R-FL)House, R-FL 路 BoughtPurchase$50,001 to $100,000$50K to $100K
11 May 2026Maria Elvira Salazar (House, R-FL)House, R-FL 路 BoughtPurchase$1,001 to $15,000$1K to $15K
15 Apr 2026Donald J Trump (President)President 路 BoughtPurchase$1,001 to $15,000$1K to $15K

Showing 10 of 26 trades

Source: House, Senate and OGE disclosures via the Congress trading monitor

Not on file: no WARN layoff notices under its own name since October 2023.