Miami International Holdings, Inc. (MIAX) insider trading

{
  "status": "OK",
  "results": [
    {
      "tickers": [
        "MIAX"
      ],
      "issuer_cik": "0001438472",
      "owner_cik": "0002079445",
      "accession_number": "0001628280-26-065268",
      "form_type": "4",
      "filing_date": "2026-10-06",
      "period_of_report": "2026-10-02",
      "issuer_name": "MIAMI INTERNATIONAL HOLDINGS, INC.",
      "issuer_trading_symbol": "MIAX",
      "owner_name": "Schafer Douglas M. JR",
      "is_director": false,
      "is_officer": true,
      "is_ten_percent_owner": false,
      "is_other": false,
      "officer_title": "EVP and CIO",
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-10-02",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 40000,
      "transaction_price_per_share": 33.34,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 387414,
      "transaction_value": 1333600.0000000002,
      "not_subject_to_section_16": false,
      "direct_or_indirect": "D",
      "footnotes": [
        {
          "id": "F1",
          "description": "This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 16, 2025."
        },
        {
          "id": "F2",
          "description": "This transaction was executed in multiple trades throughout the day at prices ranging from $32.91 to $33.97. 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."
        }
      ]
    },
    {
      "tickers": [
        "MIAX"
      ],
      "issuer_cik": "0001438472",
      "owner_cik": "0002080506",
      "accession_number": "0002080506-26-000027",
      "form_type": "4",
      "filing_date": "2026-09-17",
      "period_of_report": "2026-09-16",
      "issuer_name": "MIAMI INTERNATIONAL HOLDINGS, INC.",
      "issuer_trading_symbol": "MIAX",
      "owner_name": "Brown Shelly",
      "is_director": false,
      "is_officer": true,
      "is_ten_percent_owner": false,
      "is_other": false,
      "officer_title": "EVP, Chief Strategy Officer",
      "security_type": "non_derivative",
      "record_type": "transaction",
      "security_title": "Common Stock",
      "transaction_timeliness": "O",
      "aff_10b5_one": true,
      "transaction_date": "2026-09-16",
      "transaction_code": "S",
      "equity_swap_involved": false,
      "transaction_shares": 21217,
      "transaction_price_per_share": 38.61,
      "transaction_acquired_disposed": "D",
      "shares_owned_following_transaction": 316490,
      "transaction_value": 819188.37,
      "not_subject_to_section_16": false,
      "direct_or_indirect": "D",
      "footnotes": [
        {
          "id": "F1",
          "description": "This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 22, 2025."
        },
        {
          "id": "F2",
          "description": "This transaction was executed in multiple trades throughout the day at prices ranging from $37.84 to $39.56. 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."
        }
      ]
    }
  ]
}

// trimmed to 2 results

The response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.