MIAMI INTERNATIONAL HOLDINGS, INC. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Gallagher Thomas P. | Chairman & CEO | Gift | 2,000 | — | — | 585,963 | Dec 23, 2025 |
| Brown Shelly | EVP, Chief Strategy Officer | Option Exercise | 8,333 | $12.00 | $99,996 | 345,031 | Dec 16, 2025 |
| Emmons Lance | EVP and CFO | Option Exercise | 6,195 | $16.14 | $99,987 | 122,572 | Dec 16, 2025 |
| STAHL MURRAY | — | Purchase | 2,439 | $41.00 | $99,999 | 4,560,364 | Dec 12, 2025 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | — | Purchase | 2 | $41.97 | $84 | 4,557,925 | Oct 3, 2025 |
| STAHL MURRAY | — | Purchase | 4 | $41.76 | $167 | 4,557,923 | Sep 26, 2025 |
| Smollen John | EVP Traded Products & Relation | Option Exercise | 24,999 | $12.00 | $299,988 | 166,119 | Sep 11, 2025 |
| Brown Shelly | EVP, Strat. Planning & BD | Tax Withholding | 16,283 | $36.81 | $599,377 | 311,699 | Sep 10, 2025 |
| Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | Tax Withholding | 38,090 | $37.30 | $1,420,757 | 106,297 | Sep 9, 2025 |
| Jayabalan Harish | EVP, CISO and CRO | Option Exercise | 3,001 | $12.00 | $36,012 | 75,385 | Sep 9, 2025 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | — | Purchase | 34,470 | $36.10 | $1,244,367 | 4,557,919 | Aug 28, 2025 |
| Brown Shelly | EVP, Strat. Planning & BD | Tax Withholding | 11,047 | $33.90 | $374,493 | 327,982 | Aug 26, 2025 |
| Gallagher Thomas P. | Chairman & CEO | Tax Withholding | 192,220 | $33.90 | $6,516,258 | 1,848,274 | Aug 26, 2025 |
| Stahlin Paul | — | C | 14,083 | — | — | 25,083 | Aug 15, 2025 |
| Schafer Douglas M. JR | EVP and CIO | C | 387,296 | — | — | 537,796 | Aug 15, 2025 |
| Smollen John | EVP Traded Products & Relation | C | 73,173 | — | — | 68,173 | Aug 15, 2025 |
| Al-Bahar Talal Jassim | — | C | 238,462 | — | — | 3,617,296 | Aug 15, 2025 |
| Brown Shelly | EVP, Strat. Planning & BD | C | 500 | — | — | 339,029 | Aug 15, 2025 |
| Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | C | 49,194 | — | — | 81,887 | Aug 15, 2025 |
| Jayabalan Harish | EVP, CISO and CRO | C | 500 | — | — | 50,385 | Aug 15, 2025 |
| Comly Barbara J. | EVP, GC & Corporate Secretary | C | 100,500 | — | — | 811,960 | Aug 15, 2025 |
| Eckert Kurt M. | — | C | 46,875 | — | — | 167,375 | Aug 15, 2025 |
| Gallagher Thomas P. | Chairman & CEO | C | 573,963 | — | — | 585,963 | Aug 15, 2025 |
| Teekell Judson Gray | — | C | 31,242 | — | — | 62,338 | Aug 15, 2025 |
| Raymond Mark F. | — | C | 26,327 | — | — | 43,827 | Aug 15, 2025 |
| Schwarzkopf Cynthia | — | C | 45,058 | — | — | 81,308 | Aug 15, 2025 |
| Emmons Lance | EVP and CFO | Purchase | 4 | $31.44 | $126 | 4 | Aug 15, 2025 |
| Moore Lisa | — | Purchase | 5,500 | $23.00 | $126,500 | 5,500 | Aug 13, 2025 |
| Jayabalan Harish | EVP, CISO and CRO | Purchase | 2,500 | $23.00 | $57,500 | 6,443 | Aug 13, 2025 |
| Stahlin Paul | — | Purchase | 1,000 | $23.00 | $23,000 | 1,000 | Aug 13, 2025 |
| Nazarali Jamil | — | Purchase | 2,500 | $23.00 | $57,500 | 2,500 | Aug 13, 2025 |
| Comly Barbara J. | EVP, GC & Corporate Secretary | Tax Withholding | 288,075 | $23.00 | $6,625,725 | 580,843 | Aug 13, 2025 |
| Smollen John | EVP Traded Products & Relation | Purchase | 5,000 | $23.00 | $115,000 | 7,226 | Aug 13, 2025 |
| Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | Purchase | 100 | $23.00 | $2,300 | 32,193 | Aug 13, 2025 |
| Gallagher Thomas P. | Chairman & CEO | Purchase | 12,000 | $23.00 | $276,000 | 12,000 | Aug 13, 2025 |
| Lozier Kenneth W. | — | Purchase | 1,000 | $23.00 | $23,000 | 1,000 | Aug 13, 2025 |
| Massad Mark I. | — | Purchase | 500 | $23.00 | $11,500 | 500 | Aug 13, 2025 |