Schafer Douglas M. JR 4

4 · MIAMI INTERNATIONAL HOLDINGS, INC. · Filed Aug 19, 2025

Insider Transaction Report

Form 4

Period: 2025-08-15

MIAMI INTERNATIONAL HOLDINGS, INC.MIAX

Schafer Douglas M. JR

EVP and CIO

Transactions

Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15+130,290→ 130,290 total
Exercise: $15.22Exp: 2031-01-27→ Common Stock (130,290 underlying)
Conversion
Common Stock
2025-08-15+387,296→ 537,796 total
Conversion
Nonvoting Common Stock
2025-08-15−387,296→ 0 total
→ Common Stock (387,296 underlying)
Exercise/Conversion
Incentive Stock Option (Right to Buy)
2025-08-15+16,666→ 16,666 total
Exercise: $12.00Exp: 2028-05-17→ Common Stock (16,666 underlying)
Exercise/Conversion
Incentive Stock Option (Right to Buy)
2025-08-15−19,710→ 0 total
Exercise: $15.22Exp: 2031-01-27→ Nonvoting Common Stock (19,710 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15−133,334→ 0 total
Exercise: $12.00Exp: 2028-05-17→ Nonvoting Common Stock (133,334 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15−150,000→ 0 total
Exercise: $16.14Exp: 2031-09-09→ Nonvoting Common Stock (150,000 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15−200,000→ 0 total
Exercise: $12.00Exp: 2029-07-31→ Nonvoting Common Stock (200,000 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15+200,000→ 200,000 total
Exercise: $12.00Exp: 2029-07-31→ Common Stock (200,000 underlying)
Conversion
Common Stock
2025-08-15+500→ 537,796 total
Conversion
Series B Preferred Stock
2025-08-15−500→ 0 total
→ Common Stock (500 underlying)
Exercise/Conversion
Incentive Stock Option (Right to Buy)
2025-08-15−16,666→ 0 total
Exercise: $12.00Exp: 2028-05-17→ Nonvoting Common Stock (16,666 underlying)
Exercise/Conversion
Incentive Stock Option (Right to Buy)
2025-08-15+19,710→ 19,710 total
Exercise: $15.22Exp: 2031-01-27→ Common Stock (19,710 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15−150,000→ 0 total
Exercise: $12.00Exp: 2026-08-02→ Nonvoting Common Stock (150,000 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15+150,000→ 150,000 total
Exercise: $12.00Exp: 2026-08-02→ Common Stock (150,000 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15+133,334→ 133,334 total
Exercise: $12.00Exp: 2028-05-17→ Common Stock (133,334 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15−130,290→ 0 total
Exercise: $15.22Exp: 2031-01-27→ Nonvoting Common Stock (130,290 underlying)
Exercise/Conversion
Nonqualified Stock Option (Right to Buy)
2025-08-15+150,000→ 150,000 total
Exercise: $16.14Exp: 2031-09-09→ Common Stock (150,000 underlying)

Footnotes (4)

[F1]Represents 500 shares of Series B Preferred Stock, held jointly with his spouse with right of survivorship, that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering ("IPO") and which have no expiration date.
[F2]Represents 387,296 shares of Nonvoting 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]The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the IPO, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions.
[F4]The options are fully vested.

Documents

1 file

4
wk-form4_1755634063.xmlPrimary
FORM 4