<SEC-DOCUMENT>0001564590-19-046565-index.html : 20191220
<SEC-HEADER>0001564590-19-046565.hdr.sgml : 20191220
<ACCEPTANCE-DATETIME>20191220171219
ACCESSION NUMBER:		0001564590-19-046565
CONFORMED SUBMISSION TYPE:	8-K/A
PUBLIC DOCUMENT COUNT:		14
CONFORMED PERIOD OF REPORT:	20191101
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20191220
DATE AS OF CHANGE:		20191220

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MARKETAXESS HOLDINGS INC
		CENTRAL INDEX KEY:			0001278021
		STANDARD INDUSTRIAL CLASSIFICATION:	SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
		IRS NUMBER:				522230784
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34091
		FILM NUMBER:		191302464

	BUSINESS ADDRESS:	
		STREET 1:		55 HUDSON YARDS, 15TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10001
		BUSINESS PHONE:		212-831-6000

	MAIL ADDRESS:	
		STREET 1:		55 HUDSON YARDS, 15TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10001

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MARKETAXESS HOLDING INC
		DATE OF NAME CHANGE:	20040129
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K/A
<SEQUENCE>1
<FILENAME>mktx-8ka_20191101.htm
<DESCRIPTION>8-K/A
<TEXT>
Document 1 - file: mktx-8ka_20191101.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>2
<FILENAME>mktx-ex231_175.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 2 - file: mktx-ex231_175.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.1
<SEQUENCE>3
<FILENAME>mktx-ex991_42.htm
<DESCRIPTION>EX-99.1
<TEXT>
Document 3 - file: mktx-ex991_42.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.SCH
<SEQUENCE>4
<FILENAME>mktx-20191101.xsd
<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
<TEXT>
Document 4 - file: mktx-20191101.xsd

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.LAB
<SEQUENCE>5
<FILENAME>mktx-20191101_lab.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
<TEXT>
Document 5 - file: mktx-20191101_lab.xml

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<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>6
<FILENAME>mktx-20191101_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
<TEXT>
Document 6 - file: mktx-20191101_pre.xml

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<DOCUMENT>
<TYPE>JSON
<SEQUENCE>7
<FILENAME>MetaLinks.json
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 7 - file: MetaLinks.json

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<DOCUMENT>
<TYPE>XML
<SEQUENCE>8
<FILENAME>FilingSummary.xml
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<TEXT>
Document 8 - file: FilingSummary.html

Document 8 - RAW XML: FilingSummary.xml

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<SEQUENCE>9
<FILENAME>mktx-8ka_20191101_htm.xml
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 9 - file: mktx-8ka_20191101_htm.html

Document 9 - RAW XML: mktx-8ka_20191101_htm.xml

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<TYPE>XML
<SEQUENCE>10
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 10 - file: R1.htm

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<DOCUMENT>
<TYPE>ZIP
<SEQUENCE>11
<FILENAME>0001564590-19-046565-xbrl.zip
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<TEXT>
Document 11 - file: 0001564590-19-046565-xbrl.zip

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<DOCUMENT>
<TYPE>XML
<SEQUENCE>14
<FILENAME>report.css
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 14 - file: report.css

</DOCUMENT>
<DOCUMENT>
<TYPE>EXCEL
<SEQUENCE>15
<FILENAME>Financial_Report.xlsx
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 15 - file: Financial_Report.xlsx

</DOCUMENT>
<DOCUMENT>
<TYPE>XML
<SEQUENCE>16
<FILENAME>Show.js
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
Document 16 - file: Show.js

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</SEC-DOCUMENT>