Beneficial Ownership Report · SCHEDULE 13G
Biogen Inc.
BIIBNASDAQEQUITYCurrent
Beneficial Ownership Report
Structured filing — SCHEDULE 13G
primary_doc.xml
Subject company
- Company
- BIOGEN INC
- Company CIK
- 0000875045
- Street
- 225 BINNEY STREET
- City
- CAMBRIDGE
- State / country code
- MA
- Postal code
- 02142
Statement details
- Security class
- COMMON STOCK
- Event date
- 09/30/2026
- Rule designation
- Rule 13d-1(b)
Reporting person 1
- Name
- STATE STREET CORPORATION
- Citizenship / organization
- MA
- Reporting person type
- HC
- Aggregate amount owned
- 7,570,589.00
- Percent of class
- 5.1
- Sole voting power
- 0.00
- Shared voting power
- 4,863,692.00
- Sole dispositive power
- 0.00
- Shared dispositive power
- 7,562,236.00
- Aggregate excludes certain shares
- N
Item 1
Issuer
BIOGEN INC
Principal executive office address
225 BINNEY STREET, CAMBRIDGE, MASSACHUSETTS, 02142
Item 2
Citizenship
MA
Filing person
STATE STREET CORPORATION;
Principal business or residence address
ONE CONGRESS STREET, SUITE 1, BOSTON MA 02114, UNITED STATES
Item 3
Not applicable indication
N
Type of filing person
BK · IA · HC
Item 4
Percent of class
5.1
Amount beneficially owned
7570589.00
Sole voting power
0
Shared voting power
4,863,692
Sole dispositive power
0
Shared dispositive power
7,562,236
Item 5
Not applicable indication
Y
Ownership of 5% or less
N
Item 6
Not applicable indication
N
Ownership on behalf of another person
NOT APPLICABLE
Item 7
Not applicable indication
N
Subsidiaries
SSGA FUNDS MANAGEMENT, INC. (IA);STATE STREET BANK AND TRUST COMPANY (BK);STATE STREET GLOBAL ADVISORS (JAPAN) CO., LTD. (IA);STATE STREET GLOBAL ADVISORS ASIA LIMITED (IA);STATE STREET GLOBAL ADVISORS EUROPE LIMITED (IA);STATE STREET GLOBAL ADVISORS LIMITED (IA);STATE STREET GLOBAL ADVISORS SINGAPORE LIMITED (IA);STATE STREET GLOBAL ADVISORS TRUST COMPANY (IA);STATE STREET GLOBAL ADVISORS, AUSTRALIA, LIMITED (IA);STATE STREET GLOBAL ADVISORS, LTD. (IA);STATE STREET SAUDI ARABIA FINANCIAL SOLUTIONS COMPANY (IA);
Item 8
Not applicable indication
N
Group members
NOT APPLICABLE
Item 9
Not applicable indication
N
Item 10
Not applicable indication
N
Certifications
By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.
Signature 1
- Reporting person
- STATE STREET CORPORATION
- Signed
- ALOK MAHESHWARY
- Title
- SENIOR VICE PRESIDENT
- Date
- 11/09/2026
Company context
Founded in 1978, Biogen is a leading biotechnology company that pioneers innovative science to deliver new medicines to transform patients’ lives and to create value for shareholders and our communities. We apply deep understanding of human biology and leverage different modalities to advance first-in-class treatments or therapies that deliver superior outcomes. Our approach is to take bold risks, balanced with return on investment to deliver long-term growth. We routinely post information that may be important to investors on our website at www.biogen.com. Follow us on social media - Facebook, Instagram, LinkedIn, X, YouTube.