BIOGEN INC. — Director's Dealing 2023

May 2, 2023

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2023-05-01

Reporting Person: Keeney Adam (Head of Corporate Development)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2023-05-01	Restricted Stock Unit	$0	A	2815	Acquired	2026-05-01	Common Stock (2815)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	0	Direct

Footnotes

F1: The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of May 1, 2023.