John Smollen - 11 Sep 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
EVP Traded Products & Relation
Signature
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact
Issuer symbol
MIAX
Transactions as of
11 Sep 2025
Net transactions value
-$146,299
Form type
4
Filing time
15 Sep 2025, 17:14:05 UTC
Previous filing
19 Aug 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Smollen John EVP Traded Products & Relation C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 15 Sep 2025 0002080703

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Options Exercise $1,500,012 +125,001 +183% $12.00 193,174 11 Sep 2025 Direct
transaction MIAX Common Stock Tax liability $1,946,299 -52,054 -27% $37.39 141,120 11 Sep 2025 Direct F1
transaction MIAX Common Stock Options Exercise $299,988 +24,999 +18% $12.00 166,119 11 Sep 2025 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 Nonqualified Stock Option (Right to Buy) Options Exercise $0 -125,001 -100% $0.000000 0 11 Sep 2025 Common Stock 125,001 $12.00 Direct F2
transaction MIAX Incentive Stock Option (Right to Buy) Options Exercise $0 -24,999 -100% $0.000000 0 11 Sep 2025 Common Stock 24,999 $12.00 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of options exercised and does not represent a sale by the reporting person.
F2 The options are fully vested.