Adam Keeney - 01 May 2024 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: Head of Corporate Development
Signature: /s/ Samuel Ntonme, attorney-in-fact for Mr. Keeney
Issuer symbol: BIIB
Transactions as of: 01 May 2024
Net transactions value: -$59,652
Form type: 4
Filing time: 03 May 2024, 20:00:37 UTC
Previous filing: 09 Feb 2024
Next filing: 10 Feb 2025
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	BIIB	Common Stock	Options Exercise	$0	+938		$0.000000	938	01 May 2024	Direct
transaction	BIIB	Common Stock	Tax liability	$59,652	-276	-29%	$216.13	662	01 May 2024	Direct

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	Options Exercise	$0	-938	-33%	$0.000000	1,877	01 May 2024	Common Stock	938	$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 equal yearly installments beginning on the first anniversary of the grant date of May 1, 2023.