BIOGEN INC. — Director's Dealing 2015

Oct 26, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN INC. (BIIB)
CIK: 0000875045
Period of Report: 2015-10-22

Reporting Person: DENNER ALEXANDER J (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-10-22	Common Stock	P	210000	$277.80	Acquired	210000	Indirect
2015-10-23	Common Stock	P	100000	$276.77	Acquired	310000	Indirect

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	7890	Direct

Footnotes

F1: On October 22, 2015, each of Sarissa Capital Domestic Fund LP, a Delaware limited partnership ("Sarissa Domestic") and Sarissa Capital Offshore Master Fund LP, a Cayman Islands exempted limited partnership ("Sarissa Offshore"), purchased an aggregate of 128,806 and 81,194 shares, respectively, of common stock of Biogen Inc.

F2: On October 23, 2015, each of Sarissa Domestic and Sarissa Offshore purchased an aggregate of 61,336 and 38,664 shares, respectively, of common stock of Biogen Inc.

F3: 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 the Sarissa Funds. Alexander 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 the Sarissa Funds directly beneficially own.

F4: Dr. Denner disclaims beneficial ownership of the shares being reported on this Form 4 except to the extent of his pecuniary interest therein.