BIOGEN INC. — Director's Dealing 2010

Feb 17, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2010-02-13

Reporting Person: MULLEN JAMES C (Director, CEO & President)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-02-13	Common Stock	F	8182	$55.21	Disposed	104139	Direct
2010-02-13	Common Stock	F	8253	$55.21	Disposed	95886	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	75000	Indirect