13F Pro

SEC Form 4 reporting owner

Gallagher Thomas P.

Gallagher Thomas P. has filed 24 Form 4 transactions reported between December 23, 2025 and September 3, 2026, as Chairman & CEO of MIAMI INTERNATIONAL HOLDINGS, INC..

Name as filed: Gallagher Thomas P.

Open-market buys, 24 mo
None
reported
Open-market sales, 24 mo
$12.9M
3 lines
Companies
1
with Form 4 filings
Latest transaction
Sep 3, 2026
transaction date

Roles and reported holdings

  • MIAXMIAMI INTERNATIONAL HOLDINGS, INC.
    Dec 23, 2025 – Sep 3, 2026

    Chairman & CEO

    Held directly485,963 sh as of Apr 15, 2026 · Form 4
    Held indirectly (latest line)1,423,275 sh as of Aug 19, 2026 · Form 4

    24 months: $12.9M sold

Transaction history

All 24 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

DateCompanyTypeSharesValueFiling
Sep 3, 2026MIAXChairman & CEOOption exerciseCode M · direct4,464$100K@ $22.40Form 4
Sep 3, 2026MIAXChairman & CEOOption exerciseCode M · direct13,140$200K@ $15.22Form 4
Sep 3, 2026MIAXChairman & CEOOption exerciseCode M · direct8,333$100K@ $12.00Form 4
Sep 3, 2026MIAXChairman & CEOOption exerciseCode M · direct16,666$200K@ $12.00Form 4
Sep 3, 2026MIAXChairman & CEOOption exerciseCode M · indirect47,000$564K@ $12.00Form 4
Aug 19, 2026MIAXChairman & CEOOpen-market saleCode S · indirect149,700$6.2M@ $41.13Form 4
Aug 18, 2026MIAXChairman & CEOShares withheld for tax or exercise priceCode F · indirect150,300$6.4M@ $42.41Form 4
Aug 4, 2026MIAXChairman & CEOOption exerciseCode M · indirect48,334$580K@ $12.00Form 4
Jul 13, 2026MIAXChairman & CEOOption exerciseCode M · indirect70,000$840K@ $12.00Form 4
Jul 7, 2026MIAXChairman & CEOOption exerciseCode M · indirect28,228$339K@ $12.00Form 4
Jul 6, 2026MIAXChairman & CEOOption exerciseCode M · indirect41,772$501K@ $12.00Form 4
Jun 16, 2026MIAXChairman & CEOGrant or awardCode A · direct237,175—Form 4
Jun 16, 2026MIAXChairman & CEOGrant or awardCode A · direct2,485—Form 4
Jun 16, 2026MIAXChairman & CEOGrant or awardCode A · direct232,977—Form 4
Jun 2, 2026MIAXChairman & CEOOption exerciseCode M · indirect70,000$840K@ $12.00Form 4
May 11, 2026MIAXChairman & CEOOption exerciseCode M · direct24,999$300K@ $12.00Form 4
May 5, 2026MIAXChairman & CEOOption exerciseCode M · indirect15,771$189K@ $12.00Form 4
May 4, 2026MIAXChairman & CEOOption exerciseCode M · indirect54,229$651K@ $12.00Form 4
Apr 15, 2026MIAXChairman & CEOOpen-market saleCode S · direct49,900$2.2M@ $43.68Form 4
Apr 15, 2026MIAXChairman & CEOOpen-market saleCode S · indirect104,124$4.5M@ $43.36Form 4
Apr 15, 2026MIAXChairman & CEOOption exerciseCode M · indirect70,001$840K@ $12.00Form 4
Mar 30, 2026MIAXChairman & CEOShares withheld for tax or exercise priceCode F · indirect20,875$783K@ $37.50Form 4
Feb 10, 2026MIAXChairman & CEOShares withheld for tax or exercise priceCode F · direct50,100$2.1M@ $41.33Form 4
Dec 23, 2025MIAXChairman & CEOGiftCode G · direct2,000—Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.