SEC Form 4 · accession 0002079445-26-000017
MIAMI INTERNATIONAL HOLDINGS, INC. · MIAX
Statement of changes in beneficial ownership, as filed. Original on EDGAR ↗
Reporting owner
Douglas M. Schafer Jr.
Officer — EVP and CIO
Period of report
Sep 2, 2026
Accepted (ET)
Sep 4, 2026 · 4:25 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 Stock | Sep 2, 2026 | M | 43,334 | $12.00 | A | 430,748 | D | |
| Common Stock | Sep 2, 2026 | M | 4,666 | $12.00 | A | 435,414 | D | |
| Common StockF2 | Sep 2, 2026 | S | 48,000 | $40.48 | D | 387,414 | D |
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)F3 | $12.00 | Sep 2, 2026 | M | 43,334 | D | — | May 17, 2028 | Common Stock | 43,334 | 0 | D |
| Nonqualified Stock Option (Right to Buy)F3 | $12.00 | Sep 2, 2026 | M | 4,666 | D | — | Jul 31, 2029 | Common Stock | 4,666 | 195,334 | D |
Explanation of responses
- F1This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 16, 2025.
- F2This transaction was executed in multiple trades throughout the day at prices ranging from $39.69 to $41.80. 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.
- F3The options are fully vested.