Marketaxess Holdings Inc (MKTX)

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Institutional Investors' Holdings

Filing Period: Filing is Ongoing

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	3,999,836	$453,941,390	0.01%
2.	State Street Corp	1,281,769	$145,433,788	0%
3.	Citigroup IncCALL	999,500	$113,433,255	0.04%
4.	Bank Of New York Mellon Corp	257,642	$29,239,844	0%
5.	Cooke & Bieler Lp	238,755	$27,096,305	0.31%