BIOGEN INC. — Director's Dealing 2025

Feb 12, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2025-02-10

Reporting Person: ALEXANDER SUSAN H (EVP Chief Legal Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-02-10	Common Stock	M	2575	—	Acquired	37072	Direct
2025-02-10	Common Stock	F	807	$142.54	Disposed	36265	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-02-10	Restricted Stock Unit	$0	M	2575	Disposed	2025-02-10	Common Stock (2575)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	20082	Indirect

Footnotes

F1: The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 10, 2022.