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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
875045	Biogen Idec Inc.	BIIB	Biological Products, (No Disgnostic Substances) (2836)	330112644

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1263839	H Susan Alexander	Biogen Idec Inc. 133 Boston Post Road Weston MA 02493	Evp, General Counsel	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2012-06-15	20,000	$45.72	30,185	No	4	M	Direct
Common Stock	Acquisiton	2012-06-15	29,800	$49.31	59,985	No	4	M	Direct
Common Stock	Disposition	2012-06-15	49,800	$140.00	10,185	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2012-06-15	20,000	$0.00	20,000	$45.72
Common Stock	Stock Option (Right to Buy)	Disposition	2012-06-15	29,800	$0.00	29,800	$49.31

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2016-02-15	No	4	M	Direct
0		2017-02-12	No	4	M	Direct

Footnotes

Exercise/sale pursuant to a trading plan intended to comply with Rule 10b5-1 of the Securities Exchange Act of 1934.
Granted under one of the Issuer's stock option plans, in an exempt transaction under SEC rule 16(b)-3(d).
The stock option becomes exercisable in four (4) equal annual installments, commencing one year after the grant date of 02/15/06.
The stock option becomes exercisable in four (4) equal annual installments, commencing one year after the grant date of 02/12/07.