Christopher A. Viehbacher - 07 Feb 2024 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: President and CEO, Director
Signature: /s/ Wendell Taylor, attorney-in-fact for Christopher A. Viehbacher
Issuer symbol: BIIB
Transactions as of: 07 Feb 2024
Net transactions value: $0
Form type: 4
Filing time: 09 Feb 2024, 19:56:57 UTC
Previous filing: 05 Dec 2022
Next filing: 10 Feb 2025
SEC: View on sec.gov

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	BIIB	Restricted Stock Unit	Award	$0	+27,025		$0.000000	27,025	07 Feb 2024	Common Stock	27,025	$0.000000	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	The restricted stock units vest in three (3) equal annual installments, commencing one year after the grant date of 02/07/2024.