| Name | Relationship | Address | Signature | Signature date | CIK |
|---|---|---|---|---|---|
| STAHL MURRAY | Director | 470 PARK AVE S, 8TH FLOOR SOUTH, NEW YORK | /s/ Jay Kesslen, attorney-in-fact | 30 Sep 2025 | 0001207097 |
| HORIZON KINETICS ASSET MANAGEMENT LLC | 10%+ Owner | 470 PARK AVE S, 8TH FLOOR SOUTH, NEW YORK | /s/ Jay Kesslen, attorney-in-fact | 30 Sep 2025 | 0001056823 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MIAX | Common Stock | Purchase | $1,244,367 | +34,470 | +0.76% | $36.10 | 4,557,919 | 28 Aug 2025 | Horizon Kinetics Asset Management LLC | F1, F2, F3 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| holding | MIAX | OPTIONS | 2,500 | 28 Aug 2025 | Miami International Holdings Inc | 2,500 | $16.14 | Direct | F4 | |||||
| holding | MIAX | OPTIONS | 7,500 | 28 Aug 2025 | Miami International Holdings Inc | 7,500 | $16.14 | Direct | F4 | |||||
| holding | MIAX | OPTIONS | 10,000 | 28 Aug 2025 | Miami International Holdings Inc | 10,000 | $25.98 | Direct | F4 | |||||
| holding | MIAX | OPTIONS | 14,331 | 28 Aug 2025 | Miami International Holdings Inc | 14,331 | $19.84 | Direct | F4 | |||||
| holding | MIAX | Warrants | 24,878 | 28 Aug 2025 | Miami International Holdings Inc | 24,878 | $20.50 | Horizon Kinetics Asset Management LLC | F1, F5 | |||||
| holding | MIAX | Warrants | 27,561 | 28 Aug 2025 | Miami International Holdings Inc | 27,561 | $20.50 | Horizon Kinetics Asset Management LLC | F1, F5 | |||||
| holding | MIAX | Warrants | 21,290 | 28 Aug 2025 | Miami International Holdings Inc | 21,290 | $15.00 | Horizon Kinetics Asset Management LLC | F1, F5 | |||||
| holding | MIAX | Warrants | 38,927 | 28 Aug 2025 | Miami International Holdings Inc | 38,927 | $20.50 | Horizon Kinetics Asset Management LLC | F1, F5 |
| Id | Content |
|---|---|
| F1 | Murray Stahl serves as Chairman, Chief Executive Officer, and Chief Investment Officer of Horizon Kinetics Asset Management LLC ("HKAM"), which manages funds and accounts (the "Managed Accounts") that hold securities of the Issuer. Mr. Stahl does not exercise investment discretion with respect to the securities of the Issuer that are beneficially owned by the Managed Accounts. Mr. Stahl disclaims beneficial ownership over the securities reported, except to the extent of his pecuniary interest therein, if any. The filing of this Form shall not be deemed an admission that the Mr. Stahl is the beneficial owner of such securities for purposes of Section 16 or any other purpose. |
| F2 | Includes 5,000 shares of Series B Preferred Stock that have been converted into Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date and 14,998 shares of Non-Voting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's IPO and which have no expiration date. |
| F3 | Includes Shares that were inadvertently excluded from the Form 3 filing made on August 13, 2025 |
| F4 | The Options given to Mr. Stahl are fully vested. |
| F5 | The Warrants are currently vested and presently exercisable until the expiration date show. |