BIOGEN INC. — Director's Dealing 2019

May 2, 2019

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2019-05-01

Reporting Person: Vounatsos Michel (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2019-05-01	Common Stock	P	4351	$231.48	Acquired	21007.321	Direct

Footnotes

F1: This represents the weighted average price for shares purchased at a range between $231.47 (low) and $232.06 (high).

F2: Full information regarding the number of shares purchased at each separate price will be provided to the SEC staff, the issuer or any security holder of the issuer, upon their request.

F3: Includes 82.051 shares acquired under the Biogen Inc. employee stock purchase plan on 3/29/2019.