SEC Form 4 · accession 0002080477-26-000016
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
Aug 18, 2026
Accepted (ET)
Aug 20, 2026 · 4:12 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 StockF1,F2 | Aug 18, 2026 | F | 150,300 | $42.41 | D | 1,572,975 | I | By Gallagher Investments, LLC |
| Common StockF4,F2 | Aug 19, 2026 | S | 149,700 | $41.13 | D | 1,423,275 | I | By Gallagher Investments, LLC |
Table II — derivative securities
No Table II lines on this filing.
Explanation of responses
- F1Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock awards and does not represent a sale by the reporting person.
- F2Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.
- F3This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 29, 2025.
- F4This transaction was executed in multiple trades throughout the day at prices ranging from $38.85 to $42.56. 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.