BIOGEN INC. — Director's Dealing 2020

Sep 3, 2020

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2020-09-01

Reporting Person: MCDONNELL MICHAEL R (EVP, Chief Financial Officer)

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2020-09-01	Restricted Stock Unit	$0	A	8045	Acquired	2023-09-01	Common Stock (8045)	Direct
2020-09-01	Restricted Stock Unit	$0	A	16090	Acquired	2023-09-01	Common Stock (16090)	Direct

Footnotes

F1: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 09/01/2020.

F2: 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 average closing stock price for the 30 calendar days following and including the grant date and 30 calendar days prior to and including such vesting date]).