BIOGEN INC. — Director's Dealing 2018

Jan 10, 2018

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2018-01-09

Reporting Person: PANGIA ROBERT W (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2018-01-09	Common Stock	M	5832	$57.83	Acquired	23539	Direct
2018-01-09	Common Stock	S	5832	$329.65	Disposed	17707	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2018-01-09	Stock Option (Right to Buy)	$57.83	M	5832	Disposed	2018-06-18	Common Stock (5832)	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: This option was previously reported as covering 5,700 shares at an exercise price of $59.17 per share, but was adjusted pursuant to the anti-dilution provisions of the award in connection with the spin-off of Bioverativ Inc. on February 1, 2017.