BIOGEN INC. — Director's Dealing 2019

Jan 4, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2019-01-02

Reporting Person: CAPELLO JEFFREY D (EVP & Chief Financial Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-01-02	Common Stock	M	1331	—	Acquired	1331	Direct
2019-01-02	Common Stock	F	414	$304.69	Disposed	917	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2019-01-02	Restricted Stock Unit	$0	M	1331	Disposed	2021-01-02	Common Stock (1331)	Direct
2019-01-02	Restricted Stock Unit	$0	J	1661	Disposed	2021-01-02	Common Stock (1661)	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 on 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.