{"transactions":[{"id":734609,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":37364,"kind":"person","name":"Becker Lee","position":1,"cik":"0002080955","reported_name":"Becker Lee","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-06-17T20:35:09.000Z","date":"2026-06-15","kind":"grant","planned":false,"acquired":true,"shares":2267,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The amount represents restricted stock units (\"RSUs\") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock."}],"balance_after":2267,"source":{"system":"sec-edgar","filing":"0002080955-26-000002","document":"wk-form4_1781728507.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080955/000208095526000002/wk-form4_1781728507.xml","form_type":"4"}}]}