BIOGEN INC. — Director's Dealing 2011

Nov 3, 2011

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2011-11-01

Reporting Person: Cox John (EVP Pharmaceutical Oper & Tech)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2011-11-01	Common Stock	M	2175	$72.87	Acquired	11763.0295	Direct
2011-11-01	Common Stock	S	2175	$114.37	Disposed	9588.0295	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2011-11-01	Stock Option (Right to Buy)	$72.87	M	2175	Disposed	2017-11-01	Common Stock (2175)	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 11/1/2007.