BIOGEN INC. — Director's Dealing 2020

Feb 14, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2020-02-12

Reporting Person: ALEXANDER SUSAN H (EVP Chief Legal Off & Corp Sec)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2020-02-12	Common Stock	M	1735	—	Acquired	33711	Direct
2020-02-12	Common Stock	F	756	$331.76	Disposed	32955	Direct
2020-02-12	Common Stock	M	2697	—	Acquired	35652	Direct
2020-02-12	Common Stock	F	798	$331.76	Disposed	34854	Direct
2020-02-12	Common Stock	M	1535	—	Acquired	36389	Direct
2020-02-12	Common Stock	F	681	$331.76	Disposed	35708	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2020-02-12	Restricted Stock Unit	$0	A	9650	Acquired	2023-02-12	Common Stock (9650)	Direct
2020-02-12	Restricted Stock Unit	$0	M	1735	Disposed	2021-02-12	Common Stock (1735)	Direct
2020-02-12	Restricted Stock Unit	$0	J	1633	Disposed	2021-02-12	Common Stock (1633)	Direct
2020-02-12	Restricted Stock Unit	$0	M	2697	Disposed	2020-02-12	Common Stock (2697)	Direct
2020-02-12	Restricted Stock Unit	$0	M	1535	Disposed	2022-02-12	Common Stock (1535)	Direct
2020-02-12	Restricted Stock Unit	$0	J	1803	Disposed	2022-02-12	Common Stock (1803)	Direct

Footnotes

F1: The number of RSUs reported represents the maximum possible number of shares that are 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.

F3: The restricted stock units will vest in 2 annual installments. One-third will vest on the first anniversary of the grant date and two-thirds will vest on the second anniversary of the grant date.