Ginger Gregory - 10 Feb 2025 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: EVP, Human Resources
Signature: /s/ Samuel Ntonme, attorney-in-fact for Dr. Gregory
Issuer symbol: BIIB
Transactions as of: 10 Feb 2025
Net transactions value: -$90,370
Form type: 4
Filing time: 12 Feb 2025, 17:43:50 UTC
Previous filing: 10 Feb 2025
Next filing: 10 Feb 2026
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	+2,159	+13%	$0.000000	18,232	10 Feb 2025	Direct
transaction	BIIB	Common Stock	Tax liability	$90,370	-634	-3.5%	$142.54	17,598	10 Feb 2025	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	-2,159	-100%	$0.000000	0	10 Feb 2025	Common Stock	2,159	$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.