BIOGEN INC. — Director's Dealing 2012

Jun 5, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2012-06-04

Reporting Person: PANGIA ROBERT W (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-06-04	Common Stock	M	5000	$36.94	Acquired	21578	Direct
2012-06-04	Common Stock	S	5000	$130.00	Disposed	16578	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-06-04	Non-qualified Stock Option (Right to Buy)	$36.94	M	5000	Disposed	2014-01-01	Common Stock (5000)	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: Granted under Issuer's 1993 Non-Employee Director's Stock Option Plan in a transaction exempt under 16(b)3(d).

F3: Immediately exercisable for all the option shares on 1/2/2004 subject to Issuer's repurchase rights which lapse on 1/2/2005.