Michael R. McDonnell - 09 Feb 2024 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: EVP, Chief Financial Officer
Signature: /s/ Wendell Taylor, attorney-in-fact for Michael R. McDonnell
Issuer symbol: BIIB
Transactions as of: 09 Feb 2024
Net transactions value: -$344,842
Form type: 4
Filing time: 13 Feb 2024, 18:03:10 UTC
Previous filing: 09 Feb 2024
Next filing: 21 Feb 2024
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	+3,257	+23%	$0.000000	17,555	09 Feb 2024	Direct
transaction	BIIB	Common Stock	Tax liability	$344,842	-1,431	-8.2%	$240.98	16,124	09 Feb 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	-3,257	-50%	$0.000000	3,257	09 Feb 2024	Common Stock	3,257	$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 February 10, 2022.