BIOGEN INC. — Director's Dealing 2017

Aug 31, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2017-08-31

Reporting Person: DENNER ALEXANDER J (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-08-31	Common Stock	A	933	$316.56	Acquired	383858	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	10029	Direct

Footnotes

F1: On August 31, 2017, in connection with a private transaction with Sarissa Capital Master Offshore Fund LP, a Cayman Island exempted limited partnership ("Sarissa Offshore"), and Sarissa Capital Domestic Fund LP, a Delaware limited partnership ("Sarissa Domestic"), Dr. Alexander Denner increased his pecuniary interest in shares of common stock of Biogen Inc. through his direct interest in Sarissa Domestic and his indirect interest in Sarissa Offshore.

F2: All shares reported herein as of August 31, 2017 are beneficially owned by Sarissa Offshore. Sarissa Capital Management GP LLC, a Delaware limited liability company ("Sarissa Capital GP"), is the general partner of Sarissa Capital Management LP, a Delaware limited partnership ("Sarissa Capital"), the investment advisor to Sarissa Offshore. Dr. Denner is the Chief Investment Officer of Sarissa Capital and the managing member of Sarissa Capital GP. By virtue of the foregoing, Dr. Denner may be deemed to indirectly beneficially own (as that term is defined in Rule 13d-3 of the Securities Exchange Act of 1934, as amended) the shares that Sarissa Offshore directly beneficially owns. Dr. Denner disclaims beneficial ownership of these shares except to the extent of any pecuniary interest therein.