BIOGEN INC. — Director's Dealing 2025

Feb 3, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2025-01-31

Reporting Person: Singhal Priya (Head of Development)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-01-31	Common Stock	M	1828	—	Acquired	7254.4761	Direct
2025-01-31	Common Stock	F	578	$143.93	Disposed	6676.4761	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-01-31	Restricted Stock Unit	$0	M	1828	Disposed	2026-02-01	Common Stock (1828)	Direct

Footnotes

F1: This award was granted to the reporting person on February 1, 2023 and will vest in three equal installments on each anniversary of the grant date.