BIOGEN INC. — Director's Dealing 2010

Feb 19, 2010

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2010-02-18

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

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2010-02-18	Common Stock	S	3358	$56.1586	Disposed	20705.7486	Direct
2010-02-18	Common Stock	S	3194	$56.1526	Disposed	17511.7486	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: 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 $55.90 (low) and $56.31 (high).

F4: This represents the weighted average price for shares sold at a range between $55.90 (low) and $56.27 (high).