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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
1335018	A Robert Hamm	14 Cambridge Center Cambridge MA 02142	Chief Operating Officer	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	Disposition	2010-04-23	2,117	$52.20	30,763	No	4	S	Direct
Common Stock	Disposition	2010-04-23	2,138	$52.20	28,625	No	4	S	Direct
Common Stock	Disposition	2010-04-23	710	$52.16	27,915	No	4	S	Direct
Common Stock	Disposition	2010-04-23	703	$52.19	27,212	No	4	S	Direct

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

Footnotes

Sale pursuant to a trading plan intended to comply with Rule 10b5-1 of the Securities Exchange Act of 1934.
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.
This represents the weighted average price for shares sold at a range between $52.00 (low) and $52.39 (high).
This represents the weighted average price for shares sold at a range between $52.00 (low) and $52.44 (high).
This represents the weighted average price for shares sold at a range between $52.01 (low) and $52.42 (high).
This represents the weighted average price for shares sold at a range between $52.03 (low) and $52.4425 (high).