FMR LLC - 31 Dec 2025 SCHEDULE 13G Report for BIOGEN INC COMMON STOCK (BIIB)

Filing Manager
FMR LLC
Reporting Manager
FMR LLC
Security
BIOGEN INC COMMON STOCK
Symbol
BIIB
Shares outstanding
147,079,094 shares
Disclosed Ownership
9,413,062 shares
Ownership
6.4%
Form type
SCHEDULE 13G
Filing time
05 Feb 2026, 13:16:32 UTC
Date of event
31 Dec 2025
SEC
View on sec.gov

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Quoteable Key Fact

"FMR LLC disclosed 6.4% ownership in BIOGEN INC COMMON STOCK (BIIB) on 31 Dec 2025."

Quick Takeaways

  • FMR LLC filed SCHEDULE 13G for BIOGEN INC COMMON STOCK (BIIB).
  • Disclosed ownership: 6.4%.
  • Date of event: 31 Dec 2025.

What Changed

  • No earlier schedule filing is available for direct comparison.
  • Current filing was accepted on 05 Feb 2026, 13:16.

Why This Matters

  • This page explains what this Schedule 13D/13G filing tells you before manager-level rows.
  • You can verify ownership claims directly against the original SEC filing.

Official SEC Source

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

See Original Filing

Reporting Managers (2)

Name Ownership Shares Owned sole voting power shared voting power Signature Title CIK
FMR LLC 6.4% 9,413,062 8,291,795 0 Stephanie J. Brown Duly authorized under Power of Attorney effective as of January 3, 2023, by and on behalf of FMR LLC and its direct and indirect subsidiaries*
Abigail P. Johnson 6.4% 9,413,062 0 0 Stephanie J. Brown Duly authorized under Power of Attorney effective as of January 26, 2023, by and on behalf of Abigail P. Johnson**

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