Michael R. McDonnell - 10 Feb 2023 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: 10 Feb 2023
Net transactions value: -$316,362
Form type: 4
Filing time: 14 Feb 2023, 20:25:29 UTC
Previous filing: 10 Feb 2023
Next filing: 22 Feb 2023
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	+3,256	+48%	$0.000000	10,001	10 Feb 2023	Direct
transaction	BIIB	Common Stock	Tax liability	$316,362	-1,105	-11%	$286.30	8,896	10 Feb 2023	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	-3,256	-33%	$0.000000	6,514	10 Feb 2023	Common Stock	3,256	$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.