BIOGEN INC. — Director's Dealing 2025

Mar 10, 2025

SEC Form 3 — Initial Statement of Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2025-03-01

Reporting Person: Godbout Sean (Chief Accounting Officer)

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	310	Direct

Holdings (Derivative)

Security	Exercise Price	Expiration	Underlying	Shares	Ownership
Restricted Stock Unit	$0	2028-02-06	Common Stock (1552)		Direct
Restricted Stock Unit	$0	2027-02-07	Common Stock (610)		Direct
Restricted Stock Unit	$0	2026-10-02	Common Stock (53)		Direct
Restricted Stock Unit	$0	2026-02-08	Common Stock (257)		Direct

Footnotes

F1: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 02/06/2025.

F2: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 02/07/2024.

F3: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 10/02/2023.

F4: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 02/08/2023.