{"transactions":[{"id":681796,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2026-08-19T20:10:19.000Z","date":"2026-08-17","kind":"sale","planned":true,"acquired":false,"shares":35000,"price":42.83,"value":1499050.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades throughout the day at prices ranging from $42.23 to $43.54. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":86538,"source":{"system":"sec-edgar","filing":"0001628280-26-057946","document":"wk-form4_1787170215.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828026057946/wk-form4_1787170215.xml","form_type":"4"}},{"id":732472,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Nonqualified Stock Option (Right to Buy)","published_at":"2026-06-18T20:21:22.000Z","date":"2026-06-16","kind":"grant","planned":false,"acquired":true,"shares":35861,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F3","text":"11,955 of the shares subject to this option will vest on June 16, 2027, 11,953 of the shares subject to this option will vest on June 16, 2028 and the remaining 11,953 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date."}],"balance_after":35861,"derivative":{"exercise_price":40.24,"expiration_date":"2036-06-15","underlying":"Common Stock","underlying_shares":35861},"source":{"system":"sec-edgar","filing":"0002080679-26-000006","document":"wk-form4_1781814079.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067926000006/wk-form4_1781814079.xml","form_type":"4"}},{"id":732471,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2026-06-18T20:21:22.000Z","date":"2026-06-16","kind":"grant","planned":false,"acquired":true,"shares":2485,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"829 of the shares subject to this option will vest on June 16, 2027, 828 of the shares subject to this option will vest on June 16, 2028 and the remaining 828 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date."}],"balance_after":2485,"derivative":{"exercise_price":40.24,"expiration_date":"2036-06-15","underlying":"Common Stock","underlying_shares":2485},"source":{"system":"sec-edgar","filing":"0002080679-26-000006","document":"wk-form4_1781814079.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067926000006/wk-form4_1781814079.xml","form_type":"4"}},{"id":732470,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2026-06-18T20:21:22.000Z","date":"2026-06-16","kind":"grant","planned":false,"acquired":true,"shares":37276,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The amount represents restricted stock units (\"RSUs\") that vest as to 12,426 on June 16, 2027, 12,425 on June 16, 2028 and the remaining 12,425 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date."}],"balance_after":121538,"source":{"system":"sec-edgar","filing":"0002080679-26-000006","document":"wk-form4_1781814079.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067926000006/wk-form4_1781814079.xml","form_type":"4"}},{"id":775477,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2026-05-18T20:52:47.000Z","date":"2026-05-15","kind":"sale","planned":true,"acquired":false,"shares":35000,"price":56.36,"value":1972600.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"This transaction was executed in multiple trades throughout the day at prices ranging from $55.19 to $57.02. The price reported above reflects the average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected."}],"balance_after":84262,"source":{"system":"sec-edgar","filing":"0002080679-26-000004","document":"wk-form4_1779137565.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067926000004/wk-form4_1779137565.xml","form_type":"4"}},{"id":823237,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2026-04-01T20:42:13.000Z","date":"2026-03-30","kind":"tax_withholding","planned":false,"acquired":false,"shares":8350,"price":37.5,"value":313125.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards and does not represent a sale by the reporting person."}],"balance_after":119262,"source":{"system":"sec-edgar","filing":"0002080679-26-000002","document":"wk-form4_1775076130.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067926000002/wk-form4_1775076130.xml","form_type":"4"}},{"id":965588,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2025-12-17T21:22:33.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":false,"shares":5040,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F2","text":"5,040 of the shares subject to this incentive stock option are vested and the remaining 5,040 will vest on March 29, 2026 subject to the reporting person's continued service to the Issuer or its subsidiaries through the applicable vesting date."}],"balance_after":5040,"derivative":{"exercise_price":19.84,"expiration_date":"2033-03-28","underlying":"Common Stock","underlying_shares":5040},"source":{"system":"sec-edgar","filing":"0002080679-25-000002","document":"wk-form4_1766006549.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067925000002/wk-form4_1766006549.xml","form_type":"4"}},{"id":965587,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2025-12-17T21:22:33.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":false,"shares":6195,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":16.14,"expiration_date":"2031-09-09","underlying":"Common Stock","underlying_shares":6195},"source":{"system":"sec-edgar","filing":"0002080679-25-000002","document":"wk-form4_1766006549.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067925000002/wk-form4_1766006549.xml","form_type":"4"}},{"id":965586,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2025-12-17T21:22:33.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":false,"shares":22221,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":13.5,"expiration_date":"2030-03-05","underlying":"Common Stock","underlying_shares":22221},"source":{"system":"sec-edgar","filing":"0002080679-25-000002","document":"wk-form4_1766006549.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067925000002/wk-form4_1766006549.xml","form_type":"4"}},{"id":965585,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2025-12-17T21:22:33.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":true,"shares":5040,"price":19.84,"value":99993.6,"ownership":{"direct":true},"balance_after":127612,"source":{"system":"sec-edgar","filing":"0002080679-25-000002","document":"wk-form4_1766006549.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067925000002/wk-form4_1766006549.xml","form_type":"4"}},{"id":965584,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2025-12-17T21:22:33.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":true,"shares":6195,"price":16.14,"value":99987.3,"ownership":{"direct":true},"balance_after":122572,"source":{"system":"sec-edgar","filing":"0002080679-25-000002","document":"wk-form4_1766006549.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067925000002/wk-form4_1766006549.xml","form_type":"4"}},{"id":965583,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2025-12-17T21:22:33.000Z","date":"2025-12-16","kind":"exercise","planned":false,"acquired":true,"shares":22221,"price":13.5,"value":299983.5,"ownership":{"direct":true},"balance_after":116377,"source":{"system":"sec-edgar","filing":"0002080679-25-000002","document":"wk-form4_1766006549.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000208067925000002/wk-form4_1766006549.xml","form_type":"4"}},{"id":1064297,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Nonqualified Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":true,"shares":68804,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":68804,"derivative":{"exercise_price":16.14,"expiration_date":"2031-09-09","underlying":"Common Stock","underlying_shares":68804},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":13,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064296,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Nonqualified Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":false,"shares":68804,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":16.14,"expiration_date":"2031-09-09","underlying":"Nonvoting Common Stock","underlying_shares":68804},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":12,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064295,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Nonqualified Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":true,"shares":125000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":125000,"derivative":{"exercise_price":15.22,"expiration_date":"2030-11-30","underlying":"Common Stock","underlying_shares":125000},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":11,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064294,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Nonqualified Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":false,"shares":125000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":15.22,"expiration_date":"2030-11-30","underlying":"Nonvoting Common Stock","underlying_shares":125000},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":10,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064293,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Nonqualified Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":true,"shares":102779,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":102779,"derivative":{"exercise_price":13.5,"expiration_date":"2030-03-05","underlying":"Common Stock","underlying_shares":102779},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064292,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Nonqualified Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":false,"shares":102779,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":13.5,"expiration_date":"2030-03-05","underlying":"Nonvoting Common Stock","underlying_shares":102779},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064291,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":true,"shares":6195,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":6195,"derivative":{"exercise_price":16.14,"expiration_date":"2031-09-09","underlying":"Common Stock","underlying_shares":6195},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064290,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":false,"shares":6195,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":16.14,"expiration_date":"2031-09-09","underlying":"Nonvoting Common Stock","underlying_shares":6195},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064289,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":true,"shares":22221,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":22221,"derivative":{"exercise_price":13.5,"expiration_date":"2030-03-05","underlying":"Common Stock","underlying_shares":22221},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064288,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Incentive Stock Option (Right to Buy)","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":false,"shares":22221,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"shares","element":"transactionShares","label":"F3","text":"The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F4","text":"The options are fully vested."}],"balance_after":0,"derivative":{"exercise_price":13.5,"expiration_date":"2030-03-05","underlying":"Nonvoting Common Stock","underlying_shares":22221},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064287,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Series B Preferred Stock","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":false,"shares":57646,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Includes 57,646 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date."},{"field":"shares","element":"transactionShares","label":"F1","text":"Includes 57,646 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Includes 57,646 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Includes 57,646 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date."}],"balance_after":0,"derivative":{"underlying":"Common Stock","underlying_shares":57646},"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064286,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-14","kind":"purchase","planned":false,"acquired":true,"shares":4,"price":31.44,"value":125.76,"ownership":{"direct":false,"nature":"By son"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Mr. Emmons disclaims ownership of the shares owned by his son."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Mr. Emmons disclaims ownership of the shares owned by his son."}],"balance_after":4,"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}},{"id":1064285,"issuer":{"id":4026,"kind":"organization","name":"MIAMI INTERNATIONAL HOLDINGS, INC.","symbol":"MIAX"},"owners":[{"id":21758,"kind":"person","name":"Emmons Lance","position":1,"cik":"0002080679","reported_name":"Emmons Lance","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"EVP and CFO"}}],"security":"Common Stock","published_at":"2025-08-18T20:05:32.000Z","date":"2025-08-15","kind":"exercise","planned":false,"acquired":true,"shares":57646,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Includes 57,646 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date."},{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Includes 57,646 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering (\"IPO\") and which have no expiration date."}],"balance_after":94156,"source":{"system":"sec-edgar","filing":"0001628280-25-040653","document":"wk-form4_1755547524.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/2080679/000162828025040653/wk-form4_1755547524.xml","form_type":"4"}}]}