BIOGEN INC. - Director's Dealing 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2012-05-02

Reporting Person: SCHENK LYNN (Director)

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-05-02	Common Stock	M	5975	$53.43	Acquired	8875	Direct
2012-05-02	Common Stock	S	5975	$135.00	Disposed	2900	Direct
2012-05-02	Common Stock	S	8480	$135.00	Disposed	7100	Indirect

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2012-05-02	Stock Option (Right to Buy)	$53.43	M	5975	Disposed	2019-06-02	Common Stock (5975)	Direct

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

F2: On or around June 15, 2011, Ms. Schenk transferred 7,980 shares of directly held stock to the Friedman-Schenk Revocable Trust.

F3: Granted under one of the Issuer's stock option plans, in an exempt transaction under SEC Rule 16(b)-3(d).