Marketaxess Holdings Inc (MKTX)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	4,407,136	$953,483,874	0.02%
2.	Blackrock, Inc.	2,605,396	$563,677,413	0.01%
3.	Fmr Llc	2,189,916	$473,788,302	0.03%
4.	State Street Corp	1,465,406	$317,040,588	0.01%
5.	Primecap Management Co	1,361,512	$294,563,123	0.24%