{"transactions":[{"id":1027769,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":74671,"kind":"person","name":"Berry Dean","position":1,"cik":"0002078596","reported_name":"Berry Dean","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Group COO & CEO, EMEA & APAC"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2025-10-02T16:15:18.000Z","date":"2025-10-01","kind":"grant","planned":false,"acquired":true,"shares":26017,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents a grant of restricted stock units pursuant to the Company's 2020 Equity Incentive Plan. The restricted stock units shall vest in three substantially equal installments on October 1, 2026, October 1, 2027, and October 1, 2028."}],"balance_after":26017,"source":{"system":"sec-edgar","filing":"0001193125-25-228344","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2078596/000119312525228344/ownership.xml","form_type":"4"}}]}