BIOGEN INC. — Director's Dealing 2025

Feb 10, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2025-02-06

Reporting Person: Kramer Robin (Chief Accounting Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-02-07	Common Stock	M	788	—	Acquired	7195.7483	Direct
2025-02-07	Common Stock	F	232	$141.35	Disposed	6963.7483	Direct
2025-02-07	Common Stock	M	703	—	Acquired	7666.7483	Direct
2025-02-07	Common Stock	F	244	$141.35	Disposed	7422.7483	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-02-06	Restricted Stock Unit	$0	A	10535	Acquired	2025-02-06	Common Stock (10535)	Direct
2025-02-07	Restricted Stock Unit	$0	M	788	Disposed	2026-02-08	Common Stock (788)	Direct
2025-02-07	Restricted Stock Unit	$0	M	703	Disposed	2027-02-07	Common Stock (703)	Direct

Footnotes

F1: The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 6, 2025.

F2: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 02/08/2023.

F3: The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.