SEC Form 4 · accession 0002080477-26-000010
MIAMI INTERNATIONAL HOLDINGS, INC. · MIAX
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Thomas P. Gallagher
Officer — Chairman & CEO · Director
Period of report
Jun 2, 2026
Accepted (ET)
Jun 4, 2026 · 4:37 pm EDT
Rule 10b5-1 plan
yes — trade under a plan
Issuer CIK
0001438472
Table I — non-derivative securities
| Security | Date | Code | Shares | Price | A/D | Owned after | D/I | Nature of ownership |
|---|---|---|---|---|---|---|---|---|
| Common StockF2 | Jun 2, 2026 | M | 70,000 | $12.00 | A | 1,793,275 | I | By Gallagher Investments, LLC |
| Common StockF3,F2 | Jun 2, 2026 | S | 70,000 | $42.36 | D | 1,723,275 | I | By Gallagher Investments, LLC |
Table II — derivative securities
| Security | Conv. / exercise price | Date | Code | Shares | A/D | Exercisable | Expires | Underlying | Underlying shares | Owned after | D/I |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Nonqualified Stock Option (Right to Buy)F2,F4 | $12.00 | Jun 2, 2026 | M | 70,000 | D | — | Aug 2, 2026 | Common Stock | 70,000 | 140,000 | I |
Explanation of responses
- F1This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 29, 2025.
- F2Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.
- F3This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $45.73. 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.
- F4The options are fully vested.