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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	2012-02-23	3,822	$0.00	20,599	No	4	M	Direct
Common Stock	Disposition	2012-02-23	1,413	$116.70	19,186	No	4	F	Direct
Common Stock	Disposition	2012-02-24	1,739	$115.53	17,447	No	4	S	Direct
Common Stock	Disposition	2012-02-24	406	$115.53	17,041	No	4	S	Direct
Common Stock	Disposition	2012-02-24	1,294	$116.39	15,747	No	4	F	Direct
Common Stock	Disposition	2012-02-24	1,307	$116.39	14,440	No	4	F	Direct

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

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted Stock Unit	Disposition	2012-02-23	3,822	$0.00	3,822	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
7,642		2014-02-23	No	4	M	Direct

Footnotes

Sale pursuant to a trading plan intended to comply with Rule 10b5-1 of the Securities Exchange Act of 1934.
There is no conversion or exercise price for this stock unit.
The number of RSUs reported represents the maximum possible number of shares that are eligible for vesting, which is 150% of the number of shares at target payout. One-fourth of these RSUs are eligible to vest on each of the first four anniversaries of the grant date. The actual number of shares that will vest on each vesting date will be determined by comparing the price of Biogen Idec common stock on such vesting date to the price on the grant date (i.e., number of vested shares = number of shares at target payout times [the average 60 calendar-day closing stock price ending on the vesting date divided by the average 60 calendar-day closing stock price on the grant date]).