BIOGEN INC. — Director's Dealing 2010

Mar 4, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2010-03-03

Reporting Person: SCHNEIER CRAIG ERIC (EVP, HR, Public Affairs & Comm)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-03-03	Common Stock	S	2117	$57.3333	Disposed	22719.7486	Direct
2010-03-03	Common Stock	S	2138	$57.3339	Disposed	20581.7486	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	460	Indirect

Footnotes

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

F2: This represents the weighted average price for shares sold at a range between $57.18 (low) and 57.47 (high).

F3: This represents the weighted average price for shares sold at a range between $57.21 (low) and 57.54 (high).

F4: 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.