BIOGEN INC. — Director's Dealing 2021

Jul 2, 2021

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2021-07-01

Reporting Person: Kramer Robin (Chief Accounting Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2021-07-01	Common Stock	M	251	$348.92	Acquired	945.348	Direct
2021-07-01	Common Stock	F	74	$348.92	Disposed	871.348	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2021-07-01	Restricted Stock Unit	$0	M	251	Disposed	2023-07-01	Common Stock (251)	Direct

Footnotes

F1: Includes 102.902 shares acquired under the Biogen Inc. employee stock purchase plan on 3/31/2021.

F2: The restricted stock units vest in three (3) equal annual installments commencing one year after the grant date of 07/01/2020.