BIOGEN INC. — Director's Dealing 2024

Sep 5, 2024

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2024-08-30

Reporting Person: Singhal Priya (Head of Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2024-08-30	Common Stock	M	1668	—	Acquired	6554.4761	Direct
2024-08-30	Common Stock	F	807	$204.76	Disposed	5747.4761	Direct
2024-09-03	Common Stock	S	431	$204.22	Disposed	5316.4761	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2024-08-30	Restricted Stock Unit	$0	M	1668	Disposed	2025-09-01	Common Stock (1668)	Direct

Footnotes

F1: This award was granted to the reporting person on September 1,
2022 and will vest in three equal installments on each anniversary of the grant date.