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Home > Insider Trading > Biogen Inc.

Biogen Inc. (BIIB)

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Institutional Investors' Holdings

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No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	17,032,839	$2,330,773,689	0.04%
2.	Primecap Management Co	15,943,259	$2,181,675,561	1.8%
3.	Blackrock, Inc.	15,211,036	$2,081,478,238	0.04%
4.	State Street Corp	7,396,910	$1,012,193,164	0.04%
5.	Wellington Management Group Llp	4,672,437	$639,376,280	0.12%