Marketaxess Holdings Inc (MKTX)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	4,434,946	$1,002,475,195	0.01%
2.	Blackrock, Inc.	3,163,885	$715,164,500	0.01%
3.	Fmr Llc	2,300,536	$520,013,184	0.03%
4.	State Street Corp	1,629,511	$368,326,600	0.01%
5.	Primecap Management Co	1,369,102	$309,471,816	0.23%