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Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":767248,"source":{"system":"sec-edgar","filing":"0001209191-21-050861","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121050861/doc4.xml","form_type":"4"}},{"id":2606725,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-08-11T16:38:02.000Z","date":"2021-08-09","kind":"sale","acquired":false,"shares":2321,"price":483.36,"value":1121878.56,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The transactions were executed in multiple trades at prices ranging from $482.64 to $483.63. The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":772739,"source":{"system":"sec-edgar","filing":"0001209191-21-050861","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121050861/doc4.xml","form_type":"4"}},{"id":2679094,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Stock Option (right to 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Except as amended herein, the information set forth in the original Form 4 remains unchanged."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents a grant of restricted stock units pursuant to the Company's 2020 Equity Incentive Plan. The restricted stock units will vest in three installments of 34% on January 31, 2022, and 33% on each of January 31, 2023 and January 31, 2024."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"This amendment on Form 4/A is being filed to amend the Form 4 filed by the reporting person on January 20, 2021, solely to correct the amount of securities acquired in Column 4 of Table I and amount of securities beneficially owned following the reported transaction in Column 5 of Table I, each of which incorrectly reported the amount of restricted stock units acquired by the reporting person on January 15, 2021. Except as amended herein, the information set forth in the original Form 4 remains unchanged."}],"balance_after":797704,"source":{"system":"sec-edgar","filing":"0001209191-21-028572","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121028572/doc4a.xml","form_type":"4/A","original_submission_date":"2021-01-20"}},{"id":2781687,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per 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The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":766573,"source":{"system":"sec-edgar","filing":"0001209191-21-021358","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121021358/doc4.xml","form_type":"4"}},{"id":2781682,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-03-17T16:33:32.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":985,"price":522.98,"value":515135.3,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"shares","element":"transactionShares","label":"F11","text":"The transactions were executed in multiple trades at prices ranging from $522.45 to $523.33. The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":766973,"source":{"system":"sec-edgar","filing":"0001209191-21-021358","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121021358/doc4.xml","form_type":"4"}},{"id":2781681,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-03-17T16:33:32.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":879,"price":521.68,"value":458556.72,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"shares","element":"transactionShares","label":"F10","text":"The transactions were executed in multiple trades at prices ranging from $521.43 to $522.14. The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":767958,"source":{"system":"sec-edgar","filing":"0001209191-21-021358","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121021358/doc4.xml","form_type":"4"}},{"id":2781680,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-03-17T16:33:32.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":2076,"price":520.83,"value":1081243.08,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"shares","element":"transactionShares","label":"F9","text":"The transactions were executed in multiple trades at prices ranging from $520.40 to $521.29. The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":768837,"source":{"system":"sec-edgar","filing":"0001209191-21-021358","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121021358/doc4.xml","form_type":"4"}},{"id":2781679,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-03-17T16:33:32.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":4169,"price":519.9,"value":2167463.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"shares","element":"transactionShares","label":"F8","text":"The transactions were executed in multiple trades at prices ranging from $519.35 to $520.34. The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":770913,"source":{"system":"sec-edgar","filing":"0001209191-21-021358","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121021358/doc4.xml","form_type":"4"}},{"id":2781678,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-03-17T16:33:32.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":1430,"price":518.81,"value":741898.3,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"shares","element":"transactionShares","label":"F7","text":"The transactions were executed in multiple trades at prices ranging from $518.33 to $519.28. The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":775082,"source":{"system":"sec-edgar","filing":"0001209191-21-021358","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121021358/doc4.xml","form_type":"4"}},{"id":2781677,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-03-17T16:33:32.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":2851,"price":517.81,"value":1476276.31,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"shares","element":"transactionShares","label":"F6","text":"The transactions were executed in multiple trades at prices ranging from $517.33 to $518.29. The price above reflects the weighted average sales price. Detailed information regarding the number of shares sold at each separate price will be provided upon request by the Commission staff, the Issuer or a security holder of the Issuer."}],"balance_after":776512,"source":{"system":"sec-edgar","filing":"0001209191-21-021358","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1296466/000120919121021358/doc4.xml","form_type":"4"}},{"id":2781676,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":86083,"kind":"person","name":"McVey Richard M","position":1,"cik":"0001296466","reported_name":"McVey Richard M","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman & CEO"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2021-03-17T16:33:32.000Z","date":"2021-03-15","kind":"sale","acquired":false,"shares":2603,"price":516.73,"value":1345048.19,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person."},{"field":"shares","element":"transactionShares","label":"F5","text":"The transactions were executed in multiple trades at prices ranging from $516.31 to $517.28. The price above reflects the weighted average sales price. 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