BIOGEN INC. — Director's Dealing 2013

Feb 7, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2013-02-06

Reporting Person: Pawlicki Raymond (SVP, Chief Information Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-02-06	Common Stock	M	10000	$49.65	Acquired	17652.7107	Direct
2013-02-06	Common Stock	S	10000	$165.55	Disposed	7652.7107	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-02-06	Stock Option (Right to Buy)	$49.65	M	10000	Disposed	2019-02-24	Common Stock (10000)	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 vest in four (4) equal annual installments commencing one year after the grant date of 02/24/09.