Cogent Communications Holdings Inc. (CCOI)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	6,796,658	$523,818,450	0.01%
2.	Vanguard Group Inc	5,114,596	$394,181,914	0%
3.	Brown Advisory Inc	1,897,090	$146,208,694	0.18%
4.	State Street Corp	1,836,469	$141,536,666	0%
5.	Edgepoint Investment Group Inc.	1,543,269	$118,939,742	0.93%