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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.	Primecap Management Co	16,264,481	$4,208,759,748	3.33%
2.	Vanguard Group Inc	14,407,330	$3,728,184,783	0.08%
3.	Blackrock Inc.	14,246,658	$3,686,607,689	0.09%
4.	State Street Corp	6,945,665	$1,797,329,732	0.08%
5.	Wellington Management Group Llp	5,324,396	$1,377,793,953	0.25%