Judson Gray Teekell - 19 May 2026 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Reporting relationship: Director
Issuer ticker: MIAX
Reported as of: 19 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 19 May 2026, 16:34:48 UTC
Prior SEC filing: 05 May 2026
Next SEC filing: 04 Jun 2026
Source filing: View source filing
Reporting owner signature: /s/ Barbara J. Comly, Attorney-in-Fact

Key filing fact

Judson Gray Teekell filed Form 4 for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) on 19 May 2026.

Key facts

This page summarizes Judson Gray Teekell's Form 4 filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 19 May 2026, 16:34.

Change

Previous filing in this sequence was filed on 05 May 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001959770 Primary reporting owner

Teekell Judson Gray

Relationship: Director
Address: C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON
Signature: /s/ Barbara J. Comly, Attorney-in-Fact
Signature date: 19 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MIAX transaction

Common Stock

Options Exercise

Transaction value
Shares: +22,667
Change %: +40%
Price: $12.00^*
Shares after: 79,005
Date: 19 May 2026
Ownership: Direct

MIAX transaction

Common Stock

Tax liability

Transaction value
Shares: -4,991
Change %: -6.3%
Price: $54.51^*
Shares after: 74,014
Date: 19 May 2026
Ownership: Direct
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -22,667
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 19 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 22,667
Exercise price: $12.00
Footnotes: F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

Represents shares that have been withheld by the Issuer to cover the exercise price of the options exercised and does not represent a sale by the Reporting Person.

Footnote F2

The options are fully vested.