BIOGEN INC. — Director's Dealing 2013

Sep 4, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2013-09-03

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-09-03	Common Stock	S	227	$213.795	Disposed	45534	Direct
2013-09-03	Common Stock	S	600	$214.738	Disposed	44934	Direct
2013-09-03	Common Stock	S	300	$216.255	Disposed	44634	Direct
2013-09-03	Common Stock	S	912	$213.30	Disposed	43722	Direct
2013-09-03	Common Stock	S	200	$216.31	Disposed	43522	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	5378	Indirect
Common Stock	5378	Indirect

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 $213.44 (low) and $213.91 (high).

F4: This represents the weighted average price for shares sold at a range between $214.51 (low) and $215.00 (high).

F5: This represents the weighted average price for shares sold at a range between $216.14 (low) and $216.31 (high).

F6: This represents the weighted average price for shares sold at a range between $213.12 (low) and $213.84 (high).