BIOGEN INC. — Director's Dealing 2013

May 7, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2013-05-03

Reporting Person: Pawlicki Raymond (SVP, Chief Information Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-05-03	Common Stock	F	866	$218.85	Disposed	8710.3777	Direct

Footnotes

F1: Includes 166.667 shares acquired under the Biogen Idec Inc. employee stock purchase plan on 3/28/2013.