BIOGEN INC. — Director's Dealing 2013

Sep 18, 2013

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: BIOGEN IDEC INC. (BIIB)
CIK: 0000875045
Period of Report: 2013-09-16

Reporting Person: Clancy Paul J (Executive VP and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2013-09-16	Common Stock	M	10990	$44.24	Acquired	18077	Direct
2013-09-16	Common Stock	S	2500	$237.046	Disposed	15577	Direct
2013-09-16	Common Stock	S	5165	$238.118	Disposed	10412	Direct
2013-09-16	Common Stock	S	1525	$239.004	Disposed	8887	Direct
2013-09-16	Common Stock	S	1800	$239.842	Disposed	7087	Direct
2013-09-16	Common Stock	M	6000	$41.03	Acquired	13087	Direct
2013-09-16	Common Stock	S	1600	$237.049	Disposed	11487	Direct
2013-09-16	Common Stock	S	2825	$238.292	Disposed	8662	Direct
2013-09-16	Common Stock	S	1475	$239.537	Disposed	7187	Direct
2013-09-16	Common Stock	S	100	$240.20	Disposed	7087	Direct
2013-09-16	Common Stock	M	18100	$49.31	Acquired	25187	Direct
2013-09-16	Common Stock	S	4400	$237.052	Disposed	20787	Direct
2013-09-16	Common Stock	S	7221	$238.124	Disposed	13566	Direct
2013-09-16	Common Stock	S	3269	$238.802	Disposed	10297	Direct
2013-09-16	Common Stock	S	3210	$239.793	Disposed	7087	Direct
2013-09-16	Common Stock	M	20000	$63.55	Acquired	27087	Direct
2013-09-16	Common Stock	S	4227	$236.988	Disposed	22860	Direct
2013-09-16	Common Stock	S	7503	$237.998	Disposed	15357	Direct
2013-09-16	Common Stock	S	4300	$238.648	Disposed	11057	Direct
2013-09-16	Common Stock	S	3970	$239.757	Disposed	7087	Direct
2013-09-16	Common Stock	M	43940	$60.56	Acquired	51027	Direct
2013-09-16	Common Stock	S	9000	$236.943	Disposed	42027	Direct
2013-09-16	Common Stock	S	14708	$237.933	Disposed	27319	Direct
2013-09-16	Common Stock	S	11134	$238.564	Disposed	16185	Direct
2013-09-16	Common Stock	S	9098	$239.754	Disposed	7087	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2013-09-16	Stock Option (Right to Buy)	$44.24	M	10990	Disposed	2016-02-06	Common Stock (10990)	Direct
2013-09-16	Stock Option (Right to Buy)	$41.03	M	6000	Disposed	2016-08-01	Common Stock (6000)	Direct
2013-09-16	Stock Option (Right to Buy)	$49.31	M	18100	Disposed	2017-02-12	Common Stock (18100)	Direct
2013-09-16	Stock Option (Right to Buy)	$63.55	M	20000	Disposed	2017-09-03	Common Stock (20000)	Direct
2013-09-16	Stock Option (Right to Buy)	$60.56	M	43940	Disposed	2018-02-11	Common Stock (43940)	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 sold at a range between $236.52 (low) and $237.43 (high).

F3: 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.

F4: This represents the weighted average price for shares sold at a range between $237.53 (low) and $238.52 (high).

F5: This represents the weighted average price for shares sold at a range between $238.55 (low) and $239.51(high).

F6: This represents the weighted average price for shares sold at a range between $239.62 (low) and $240.22(high).

F7: This represents the weighted average price for shares sold at a range between $236.57 (low) and $237.48(high).

F8: This represents the weighted average price for shares sold at a range between $237.82 (low) and $238.74 (high).

F9: This represents the weighted average price for shares sold at a range between $238.92 (low) and $239.90 (high).

F10: This represents the weighted average price for shares sold at a range between $236.46 (low) and $237.43 (high).

F11: This represents the weighted average price for shares sold at a range between $237.48 (low) and $238.46 (high).

F12: This represents the weighted average price for shares sold at a range between $238.48 (low) and $239.47 (high).

F13: This represents the weighted average price for shares sold at a range between $239.53 (low) and $240.35 (high).

F14: This represents the weighted average price for shares sold at a range between $236.33 (low) and $237.32 (high).

F15: This represents the weighted average price for shares sold at a range between $237.36 (low) and $238.36 (high).

F16: This represents the weighted average price for shares sold at a range between $238.38 (low) and $239.35 (high).

F17: This represents the weighted average price for shares sold at a range between $239.45 (low) and $240.20 (high).

F18: This represents the weighted average price for shares sold at a range between $236.31 (low) and $237.30 (high).

F19: This represents the weighted average price for shares sold at a range between $237.31 (low) and $238.31 (high).

F20: This represents the weighted average price for shares sold at a range between $238.31 (low) and $239.29 (high).

F21: This represents the weighted average price for shares sold at a range between $239.36 (low) and $240.32 (high).

F22: The stock option becomes exercisable in four (4) equal annual installments, commencing one year after the grant date of 02/06/06.

F23: The stock option becomes exercisable in four (4) equal annual installments, commencing one year after the grant date of 8/01/06.

F24: The stock option becomes exercisable in four (4) equal annual installments, commencing one year after the grant date of 02/12/07.

F25: The stock option becomes exercisable in four (4) equal annual installments, commencing one year after the grant date of 09/04/2007.

F26: The stock options become exercisable in four (4) equal annual installments, commencing one year after the grant date of 02/12/2008.