BIOGEN INC. — Director's Dealing 2014

Dec 16, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2014-12-15

Reporting Person: Artavanis-Tsakonas Spyridon (SVP, Chief Scientific Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-12-15	Common Stock	S	1981	$346.50	Disposed	352.015	Direct

Footnotes

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

F2: Includes 89.181 shares acquired under the Biogen Idec Inc. employee stock purchase plan on 3/31/2014.