{"transactions":[{"id":793611,"issuer":{"id":3821,"kind":"organization","name":"MARKETAXESS HOLDINGS INC","symbol":"MKTX"},"owners":[{"id":49926,"kind":"person","name":"Quan William","position":1,"cik":"0002118548","reported_name":"Quan William","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Technology Officer"}}],"security":"Common Stock, par value $0.003 per share","published_at":"2026-05-04T20:15:03.000Z","date":"2026-05-01","kind":"grant","planned":false,"acquired":true,"shares":218,"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 May 1, 2027, May 1, 2028, and May 1, 2029."}],"balance_after":218,"source":{"system":"sec-edgar","filing":"0001193125-26-204016","document":"ownership.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1278021/000119312526204016/ownership.xml","form_type":"4"}}]}