BIOGEN INC. — Director's Dealing 2017

Jan 10, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2017-01-09

Reporting Person: PANGIA ROBERT W (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-01-09	Common Stock	M	5450	$52.22	Acquired	22078	Direct
2017-01-09	Common Stock	S	5450	$295.39	Disposed	16628	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-01-09	Stock Option (Right to Buy)	$52.22	M	5450	Disposed	2017-05-30	Common Stock (5450)	Direct

Footnotes

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

F2: Options will become 100% exercisable upon completion of one year of service with Biogen Idec Inc.