Cogent Communications Holdings Inc. (CCOI)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	6,606,661	$405,054,366	0.01%
2.	Vanguard Group Inc	5,056,772	$310,030,691	0.01%
3.	Edgepoint Investment Group Inc.	2,012,297	$123,373,929	1%
4.	State Street Corp	1,774,725	$108,808,390	0%
5.	Brown Advisory Inc	1,671,470	$102,477,878	0.15%