BIOGEN INC. — Director's Dealing 2015

Mar 18, 2015

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2015-03-17

Reporting Person: Rowinsky Eric K (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2015-03-17	Common Stock	M	4667	$59.82	Acquired	15977	Direct
2015-03-17	Common Stock	S	4667	$425.453	Disposed	11310	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2015-03-17	Stock Option (Right to Buy)	$59.82	M	4667	Disposed	2020-03-22	Common Stock (4667)	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: The stock options become exercisable in three (3) equal annual installments commencing one year after the grant date of 03/22/2010.