Ginger Gregory - 16 Feb 2024 Form 4 Insider Report for BIOGEN INC. (BIIB)

Role: EVP, Human Resources
Signature: /s/ Wendell Taylor, attorney in fact for Ginger Gregory
Issuer symbol: BIIB
Transactions as of: 16 Feb 2024
Net transactions value: -$495,997
Form type: 4
Filing time: 21 Feb 2024, 21:36:10 UTC
Previous filing: 13 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
transaction	BIIB	Common Stock	Options Exercise	$0	+3,197	+29%	$0.000000	14,341	16 Feb 2024	Direct
transaction	BIIB	Common Stock	Tax liability	$336,288	-1,535	-11%	$219.08	12,806	16 Feb 2024	Direct
transaction	BIIB	Common Stock	Options Exercise	$0	+1,507	+12%	$0.000000	14,313	16 Feb 2024	Direct
transaction	BIIB	Common Stock	Tax liability	$159,709	-729	-5.1%	$219.08	13,584	16 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	Performance Stock Unit	Options Exercise	$0	-3,197	-100%	$0.000000^*	0	16 Feb 2024	Common Stock	3,197	$0.000000	Direct
transaction	BIIB	Restricted Stock Unit	Options Exercise	$0	-1,507	-45%	$0.000000	1,879	16 Feb 2024	Common Stock	1,507	$0.000000	Direct	F1
transaction	BIIB	Restricted Stock Unit	Other	$0	-1,879	-100%	$0.000000^*	0	16 Feb 2024	Common Stock	1,879	$0.000000	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This award was granted to the reporting person on February 18, 2021. The number of RSUs reported represented the maximum possible number of shares that were eligible for vesting, which is 200% of the number of shares at target payout. One-third of these RSUs are eligible to vest on each of the first three anniversaries of the grant date. The actual number of shares that will vest on each vesting date will be determined by comparing the price of Biogen common stock on such vesting date to the price on the grant date (i.e., number of vested shares = number of shares at target payout times [the 30-day average closing stock price ending on the vesting date divided by the 30-day average closing stock price following and including the grant date]).
F2	This represents the difference between the maximum possible number of shares that were eligible for vesting and the actual number that vested.

Content

This award was granted to the reporting person on February 18, 2021. The number of RSUs reported represented the maximum possible number of shares that were eligible for vesting, which is 200% of the number of shares at target payout. One-third of these RSUs are eligible to vest on each of the first three anniversaries of the grant date. The actual number of shares that will vest on each vesting date will be determined by comparing the price of Biogen common stock on such vesting date to the price on the grant date (i.e., number of vested shares = number of shares at target payout times [the 30-day average closing stock price ending on the vesting date divided by the 30-day average closing stock price following and including the grant date]).

This represents the difference between the maximum possible number of shares that were eligible for vesting and the actual number that vested.