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Filing Details

Accession Number:: 0001127602-11-014105
Form Type:: 4
Zero Holdings:: No
Publication Time:: 2011-04-29 15:03:18
Reporting Period:: 2011-04-28

Filing Date:: 2011-04-29
Accepted Time:: 2011-04-29 15:03:18
SEC Url:: Form 4 Filing

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
1409601	J Paul Clancy	Biogen Idec Inc. 133 Boston Post Road Weston MA 02493	Executive Vp And Cfo	No	Yes	No	No

Reported Non-Derivative Transactions

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Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2011-04-28	10,005	$37.45	57,202	No	4	M	Direct
Common Stock	Disposition	2011-04-28	8,705	$98.85	48,497	No	4	S	Direct
Common Stock	Disposition	2011-04-28	1,300	$99.28	47,197	No	4	S	Direct
Common Stock	Acquisiton	2011-04-28	4,761	$49.03	51,958	No	4	M	Direct
Common Stock	Disposition	2011-04-28	4,061	$98.83	47,897	No	4	S	Direct
Common Stock	Disposition	2011-04-28	700	$99.27	47,197	No	4	S	Direct
Common Stock	Disposition	2011-04-28	874	$98.75	46,323	No	4	S	Direct
Common Stock	Disposition	2011-04-28	291	$99.36	46,032	No	4	S	Direct
Common Stock	Disposition	2011-04-28	1,263	$98.83	44,769	No	4	S	Direct
Common Stock	Disposition	2011-04-28	290	$99.36	44,479	No	4	S	Direct
Common Stock	Disposition	2011-04-28	1,657	$98.86	42,822	No	4	S	Direct
Common Stock	Disposition	2011-04-28	485	$99.12	42,337	No	4	S	Direct
Common Stock	Disposition	2011-04-28	90	$99.69	42,247	No	4	S	Direct

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

Reported Derivative Transactions

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Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Stock Option (Right to Buy)	Disposition	2011-04-28	10,005	$0.00	10,005	$37.45
Common Stock	Stock Option (Right to Buy)	Disposition	2011-04-28	4,761	$0.00	4,761	$49.03

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
0		2012-12-06	No	4	M	Direct
0		2011-12-14	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.
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 $98.21 (low) and $99.18 (high).
This represents the weighted average price for shares sold at a range between $99.21 (low) and $99.39 (high).
This represents the weighted average price for shares sold at a range between $98.21 (low) and $99.20 (high).
This represents the weighted average price for shares sold at a range between $99.21 (low) and $99.34 (high).
This represents the weighted average price for shares sold at a range between $98.15 (low) and $99.08 (high).
This represents the weighted average price for shares sold at a range between $99.15 (low) and $99.72 (high).
This represents the weighted average price for shares sold at a range between $98.19 (low) and $99.13 (high).
This represents the weighted average price for shares sold at a range between $99.19 (low) and $99.72 (high).
This represents the weighted average price for shares sold at a range between $98.35 (low) and $99.21 (high).
This represents the weighted average price for shares sold at a range between $98.75 (low) and $99.70 (high).
This represents the weighted average price for shares sold at a range between $99.68 (low) and $99.72 (high).
The stock option became exercisable in four (4) equal annual installments, commencing one year after the grant date of 12/06/02.
The stock option became exercisable in four (4) equal annual installments, commencing one year after the grant date of 12/14/01.