BIOGEN INC. — Director's Dealing 2012

Jul 30, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2012-07-27

Reporting Person: ALEXANDER SUSAN H (EVP, General Counsel)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-07-27	Common Stock	M	39320	$60.56	Acquired	49505	Direct
2012-07-27	Common Stock	M	18750	$49.65	Acquired	68255	Direct
2012-07-27	Common Stock	S	58070	$150.00	Disposed	10185	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-07-27	Stock Option (Right to Buy)	$60.56	M	39320	Disposed	2018-02-11	Common Stock (39320)	Direct
2012-07-27	Stock Option (Right to Buy)	$49.65	M	18750	Disposed	2019-02-24	Common Stock (18750)	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 four (4) equal annual installments, commencing one year after the grant date of 02/12/2008.

F3: The stock options become exercisable in four (4) equal annual installments commencing one year after the grant date of 02/24/09.