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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1278021	Marketaxess Holdings Inc	MKTX	Security Brokers, Dealers & Flotation Companies (6211)	522230784

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1296468	Nicholas Themelis	C/O Marketaxess Holdings Inc. 140 Broadway, 42Nd Floor New York NY 10005	Chief Information Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock, Par Value $0.003 Per Share	Disposition	2010-02-24	3,838	$15.39	156,057	No	4	S	Direct
Common Stock, Par Value $0.003 Per Share	Disposition	2010-02-25	11,162	$15.09	144,895	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Direct
No	4	S	Direct

Footnotes

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.37 to $15.41, inclusive. The reporting person undertakes to provide to MarketAxess Holdings Inc., any security holder of MarketAxess Holdings Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes (1) and (2) to this Form 4.
The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $15.02 to $15.23, inclusive.