Marketaxess Holdings Inc (MKTX)

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Institutional Investors' Holdings

Filing Period: Filing is Ongoing

No.	Name	Shares	Value	% Port
1.	Vanguard Portfolio Management Llc	2,163,671	$356,962,442	0.02%
2.	Vanguard Capital Management Llc	1,609,259	$265,495,550	0.01%
3.	Dimensional Fund Advisors Lp	581,484	$95,932,833	0.02%
4.	Bank Of New York Mellon Corp	289,940	$47,834,350	0.01%
5.	Ubs Group Ag	272,238	$44,913,826	0.01%