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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
875045	Biogen Inc.	BIIB	Biological Products, (No Disgnostic Substances) (2836)	330112644

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1361754	J Alexander Denner	Biogen Inc. 225 Binney St. Cambridge MA 02142		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2019-01-30	30,000	$324.86	491,858	No	4	P	Indirect	See Footnotes
Common Stock	Acquisiton	2019-01-31	25,800	$330.52	517,658	No	4	P	Indirect	See Footnotes
Common Stock	Acquisiton	2019-02-01	7,000	$328.45	524,658	No	4	P	Indirect	See Footnotes

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	See Footnotes
No	4	P	Indirect	See Footnotes
No	4	P	Indirect	See Footnotes

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	10,909	Direct

Footnotes

Dr. Denner disclaims beneficial ownership of the shares being reported on this Form 4 except to the extent of his pecuniary interest therein.
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 certain investment 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 those funds directly beneficially own.