BIOGEN INC. — Director's Dealing 2026

Feb 10, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2026-02-06

Reporting Person: Kramer Robin (Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-06	Common Stock	M	789	—	Acquired	8800.7483	Direct
2026-02-06	Common Stock	F	273	$201.18	Disposed	8527.7483	Direct
2026-02-06	Common Stock	M	703	—	Acquired	9230.7483	Direct
2026-02-06	Common Stock	F	207	$201.18	Disposed	9023.7483	Direct
2026-02-06	Common Stock	M	3511	—	Acquired	12534.7483	Direct
2026-02-06	Common Stock	F	1063	$201.18	Disposed	11471.7483	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-06	Restricted Stock Unit	$0	M	789	Disposed	2026-02-08	Common Stock (789)	Direct
2026-02-06	Restricted Stock Unit	$0	M	703	Disposed	2027-02-07	Common Stock (703)	Direct
2026-02-06	Restricted Stock Unit	$0	M	3511	Disposed	2025-02-06	Common Stock (3511)	Direct

Footnotes

F1: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 02/08/2023.

F2: The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.

F3: The restricted stock units vest in three equal yearly installments beginning on the first anniversary of the grant date of February 6, 2025.