{"cik":"0001278021","ticker":"MKTX","name":"MARKETAXESS HOLDINGS INC","sic_code":"6211","sic_description":"Security Brokers, Dealers & Flotation Companies","exchange":"Nasdaq","state_of_incorporation":"","fiscal_year_end":"1231","first_filing_date":"2026-05-11","last_filing_date":"2026-09-11","url":"/sec/cik-0001278021","insider_summary":{"total_transactions":18,"unique_insiders":13,"latest_transaction":"2026-09-10"},"recent_filings":[{"accession_number":"0001193125-26-389288","form_type":"4","form_type_family":"insider","doc_date":"2026-09-11","title":"4 — MARKETAXESS HOLDINGS INC — 2026-09-11","url_slug":"/sec/cik-0001278021/4/0001193125-26-389288","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-389288-index.html"},{"accession_number":"0001193125-26-275951","form_type":"4","form_type_family":"insider","doc_date":"2026-06-18","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-18","url_slug":"/sec/cik-0001278021/4/0001193125-26-275951","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-275951-index.html"},{"accession_number":"0001193125-26-269472","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269472","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269472-index.html"},{"accession_number":"0001193125-26-269471","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269471","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269471-index.html"},{"accession_number":"0001193125-26-269467","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269467","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269467-index.html"},{"accession_number":"0001193125-26-269463","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269463","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269463-index.html"},{"accession_number":"0001193125-26-269462","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269462","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269462-index.html"},{"accession_number":"0001193125-26-269461","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269461","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269461-index.html"},{"accession_number":"0001193125-26-269459","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269459","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269459-index.html"},{"accession_number":"0001193125-26-269456","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269456","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269456-index.html"},{"accession_number":"0001193125-26-269454","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269454","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269454-index.html"},{"accession_number":"0001193125-26-269453","form_type":"4","form_type_family":"insider","doc_date":"2026-06-12","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-12","url_slug":"/sec/cik-0001278021/4/0001193125-26-269453","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-269453-index.html"},{"accession_number":"0001193125-26-265854","form_type":"8-K","form_type_family":"current","doc_date":"2026-06-10","title":"8-K — MARKETAXESS HOLDINGS INC — 2026-06-10","url_slug":"/sec/cik-0001278021/8-k/0001193125-26-265854","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-265854-index.html"},{"accession_number":"0001193125-26-255462","form_type":"4","form_type_family":"insider","doc_date":"2026-06-03","title":"4 — MARKETAXESS HOLDINGS INC — 2026-06-03","url_slug":"/sec/cik-0001278021/4/0001193125-26-255462","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-255462-index.html"},{"accession_number":"0001214659-26-006405","form_type":"SCHEDULE 13G","form_type_family":"other","doc_date":"2026-05-15","title":"SCHEDULE 13G — MARKETAXESS HOLDINGS INC — 2026-05-15","url_slug":"/sec/cik-0001278021/schedule-13g/0001214659-26-006405","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001214659-26-006405-index.html"},{"accession_number":"0001193125-26-216803","form_type":"4","form_type_family":"insider","doc_date":"2026-05-11","title":"4 — MARKETAXESS HOLDINGS INC — 2026-05-11","url_slug":"/sec/cik-0001278021/4/0001193125-26-216803","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001193125-26-216803-index.html"},{"accession_number":"0001921094-26-000457","form_type":"144","form_type_family":"other","doc_date":"2026-05-11","title":"144 — MARKETAXESS HOLDINGS INC — 2026-05-11","url_slug":"/sec/cik-0001278021/144/0001921094-26-000457","edgar_url":"https://www.sec.gov/Archives/edgar/data/1278021/0001921094-26-000457-index.html"}],"related_endpoints":{"profile":"/sec/MKTX/profile","timeline":"/sec/MKTX/timeline","peers":"/sec/MKTX/peers","insider_pulse":"/sec/MKTX/insider-pulse","insider_summary":"/sec/MKTX/insider-summary","insider_transactions":"/sec/MKTX/insider-transactions","form144":"/sec/MKTX/form144","holdings_as_filer":"/sec/MKTX/holdings","financial_facts":"/sec/MKTX/financial-facts","derivatives":"/sec/MKTX/derivatives","officers":"/sec/MKTX/officers","insider_network":"/sec/MKTX/insider-network","risk_flags":"/sec/MKTX/risk-flags","filings":"/sec/MKTX/filings","cross_topic_dossier":"/api/v1/dossier?ticker=MKTX"}}