BIOGEN INC. — Director's Dealing 2025

Apr 3, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2025-04-01

Reporting Person: Godbout Sean (Chief Accounting Officer)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-04-01	Restricted Stock Unit	$0	A	545	Acquired	2028-04-01	Common Stock (545)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	476.6667	Direct

Footnotes

F1: Includes 166.6667 shares acquired under the Biogen Inc. employee stock purchase plan on 3/31/2025.

F2: The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of April 1, 2025.