BIOGEN INC. — Director's Dealing 2017

May 2, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2017-05-01

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-01	Common Stock	P	1402	$271.35	Acquired	2927.458	Direct

Footnotes

F1: Purchase pursuant to a trading plan intended to comply with Rule 10b5-1 of the Securities Exchange Act of 1934.

F2: Includes 91.527 shares acquired under the Biogen Inc. employee stock purchase plan on 3/31/2017.