BIOGEN INC. — Director's Dealing 2014

Mar 21, 2014

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2014-03-20

Reporting Person: DORSA CAROLINE (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2014-03-20	Common Stock	M	10000	$53.64	Acquired	24468	Direct
2014-03-20	Common Stock	S	2200	$347.283	Disposed	22268	Direct
2014-03-20	Common Stock	S	2701	$348.662	Disposed	19567	Direct
2014-03-20	Common Stock	S	4199	$349.541	Disposed	15368	Direct
2014-03-20	Common Stock	S	900	$350.368	Disposed	14468	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2014-03-20	Stock Option (Right to Buy)	$53.64	M	10000	Disposed	2020-01-03	Common Stock (10000)	Direct

Footnotes

F1: Exercise/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 purchased at a range between $347.06 (low) and $347.95 (high).

F3: Full information regarding the number of shares purchased at each separate price will be provided upon request by the SEC staff, the issuer, or a security holder of the issuer.

F4: This represents the weighted average price for shares purchased at a range between $348.09 (low) and $349.06 (high).

F5: This represents the weighted average price for shares purchased at a range between $349.11 (low) and $350.08 (high).

F6: This represents the weighted average price for shares purchased at a range between $350.11 (low) and $350.85 (high).

F7: The stock options become exercisable in three (3) equal annual installments commencing one year after the grant date of 01/04/2010.