Thomas P. Gallagher - 26 Aug 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
Chairman & CEO, Director
Signature
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact
Issuer symbol
MIAX
Transactions as of
26 Aug 2025
Net transactions value
-$6,516,258
Form type
4
Filing time
28 Aug 2025, 16:33:46 UTC
Previous filing
19 Aug 2025
Next filing
29 Dec 2025
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Gallagher Thomas P. Chairman & CEO, Director C/O MIAMI INTERNATIONAL HOLDINGS, INC, 7 ROSZEL ROAD, SUITE 1A, PRINCETON /s/Alessandra Maria Corona Henriques, Attorney-in-Fact 28 Aug 2025 0002080477

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Tax liability $6,516,258 -192,220 -9.4% $33.90 1,848,274 26 Aug 2025 By Gallagher Investments, LLC F1, F2
holding MIAX Common Stock 587,963 26 Aug 2025 Direct F3
* 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 restricted stock awards and does not represent a sale by the reporting person.
F2 Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.
F3 Corrects previously reported holdings to reflect an additional 2,000 shares purchased on August 13, 2025, which are held jointly with his spouse with right of survival.