Barbara J. Comly - 09 Mar 2026 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
EVP, GC & Corporate Secretary
Signature
/s/ Barbara J. Comly
Issuer symbol
MIAX
Transactions as of
09 Mar 2026
Net transactions value
$0
Form type
4
Filing time
10 Mar 2026, 16:40:50 UTC
Previous filing
19 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Comly Barbara J. EVP, GC & Corporate Secretary C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/ Barbara J. Comly 10 Mar 2026 0002080878

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Options Exercise +8,333 +1% $12.00* 820,293 09 Mar 2026 Direct
transaction MIAX Common Stock Options Exercise +8,333 +1% $12.00* 828,626 09 Mar 2026 Direct
transaction MIAX Common Stock Options Exercise +16,666 +2% $12.00* 845,292 09 Mar 2026 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise -8,333 -100% $0.000000* 0 09 Mar 2026 Common Stock 8,333 $12.00 Direct F1, F2
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise -8,333 -100% $0.000000* 0 09 Mar 2026 Common Stock 8,333 $12.00 Direct F1, F2
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise -16,666 -100% $0.000000* 0 09 Mar 2026 Common Stock 16,666 $12.00 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 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.
F2 The options are fully vested.