BIOGEN INC. — Director's Dealing 2012

Nov 2, 2012

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2012-11-01

Reporting Person: SCANGOS GEORGE A (Director, Chief Executive Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2012-11-01	Common Stock	S	1244	$139.458	Disposed	52898	Direct
2012-11-01	Common Stock	S	400	$138.64	Disposed	52498	Direct
2012-11-01	Common Stock	S	828	$139.732	Disposed	51670	Direct

Footnotes

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

F2: Full information regarding the number of shares sold at each separate price will be provided upon request by the SEC staff, the issuer, or a security holder of the issuer.

F3: This represents the weighted average price for shares sold at a range between $138.86(low) and $139.84(high).

F4: This represents the weighted average price for shares sold at a range between $139.67(low) and $139.84(high).