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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
1236188	W Robert Pangia	Biogen Idec Inc. 133 Boston Post Road Weston MA 02493		Yes	No	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	2012-03-08	2,500	$36.94	19,078	No	4	M	Direct
Common Stock	Disposition	2012-03-08	2,500	$120.00	16,578	No	4	S	Direct
Common Stock	Acquisiton	2012-03-08	5,000	$34.34	21,578	No	4	M	Direct
Common Stock	Disposition	2012-03-08	5,000	$120.00	16,578	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	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	Non-qualified Stock Option (Right to Buy)	Disposition	2012-03-08	2,500	$0.00	2,500	$36.94
Common Stock	Stock Option (Right to Buy)	Disposition	2012-03-08	5,000	$0.00	5,000	$34.34

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
10,000	2004-01-02	2014-01-01	No	4	M	Direct
0	2004-01-02	2013-01-01	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 Issuer's 1993 Non-Employee Director's Stock Option Plan in a transaction exempt under 16(b)3(d).
Immediately exercisable for all the option shares on 1/2/2004 subject to Issuer's repurchase rights which lapse on 1/2/2005.
Granted under one of the Issuer's stock option plans, in an exempt transaction under SEC Rule 16(b)-3(d).