Stock Trading History of Kowolenko Michael

The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Kowolenko Michael since year 2005. The trader's CIK number is 1341852. At the time of this reporting, Kowolenko Michael is the SVP, Pharm Ops & Technology of Biogen Idec Inc (stock ticker symbol BIIB).

Stock purchases, sales, and option exercises reported by *Kowolenko Michael* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2007-07-25	BIIB	Biogen Idec Inc	Sale	20,507	58.00	1,189,406
2007-07-25	BIIB	Biogen Idec Inc	Option Exercise	20,507	41.83	857,756
2007-03-20	BIIB	Biogen Idec Inc	Sale	3,756	44.48	167,062
2007-02-13	BIIB	Biogen Idec Inc	Sale	8,828	49.22	434,478
2007-02-06	BIIB	Biogen Idec Inc	Option Exercise	4,534	.00	0
2006-09-19	BIIB	Biogen Idec Inc	Sale	11,942	42.76	510,681

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Kowolenko Michael (SVP, Pharm Ops & Technology of Biogen Idec Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.