Marketaxess Holdings Inc (MKTX)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	4,526,422	$1,325,562,683	0.02%
2.	Blackrock Inc.	3,178,566	$930,843,071	0.02%
3.	Royal Bank Of Canada	1,770,203	$518,403,000	0.12%
4.	State Street Corp	1,699,125	$497,588,756	0.02%
5.	Primecap Management Co	1,122,560	$328,741,696	0.26%