BIOGEN INC. — Director's Dealing 2012

Feb 28, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2012-02-27

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-02-27	Common Stock	S	2138	$115.43	Disposed	12302	Direct
2012-02-27	Common Stock	S	2117	$115.43	Disposed	10185	Direct

Footnotes

F1: Sale pursuant to a trading plan intended to comply with Rule 10b5-1 of the Securities Exchange Act of 1934.