Robin Kramer - 08 Dec 2023 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: Chief Accounting Officer
Signature: /s/ Wendell Taylor, attorney-in-fact for Robin Kramer
Issuer symbol: BIIB
Transactions as of: 08 Dec 2023
Net transactions value: -$40,679
Form type: 4
Filing time: 12 Dec 2023, 17:02:39 UTC
Previous filing: 05 Jul 2023
Next filing: 26 Dec 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	+351	+8.8%	$0.000000	4,325	08 Dec 2023	Direct
transaction	BIIB	Common Stock	Tax liability	$40,679	-170	-3.9%	$239.29	4,155	08 Dec 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	-351	-50%	$0.000000	351	08 Dec 2023	Common Stock	351	$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 on the first anniversary of the grant date of 12/8/2021.