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Stock Trading History of Maclean Michael F

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 Maclean Michael F since year 2005. The trader's CIK number is 1383731. At the time of this reporting, Maclean Michael F is the SVP, Chief Accounting Officer of Biogen Idec Inc . (stock ticker symbol BIIB). See this page for all insider trading activities at Biogen Idec Inc .

Stock purchases, sales, and option exercises reported by insider *Maclean Michael F* since 2005.
Trade Date	Symbol	Company Name (Issuer)	Trade Type	Shares	Price ($)	Value ($)
2008-07-31	BIIB	Biogen Idec Inc	Sale	1,875	72.77	136,443
2008-07-31	BIIB	Biogen Idec Inc	Option Exercise	1,875	47.77	89,568
2008-07-22	BIIB	Biogen Idec Inc	Sale	682	70.00	47,740
2008-04-08	BIIB	Biogen Idec Inc	Sale	2,214	64.39	142,553
2007-11-01	BIIB	Biogen Idec Inc	Option Exercise	1,000	.00	0

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 Maclean Michael F (SVP, Chief Accounting Officer of Biogen Idec Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.