# EDGAR Filing Document

**Accession Number:** 0002080477
**File Stem:** 0002080477-25-000004
**Filing Date:** 2025-8
**Character Count:** 12432
**Document Hash:** 3f0f349d47c6a291e412b8b5ed73d64c
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002080477-25-000004.hdr.sgml**: 20250821

**ACCESSION NUMBER**: 0002080477-25-000004

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20250821

**DATE AS OF CHANGE**: 20250821

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MIAMI INTERNATIONAL HOLDINGS, INC.
- **CENTRAL INDEX KEY:** 0001438472
- **STANDARD INDUSTRIAL CLASSIFICATION:** SECURITY BROKERS, DEALERS & FLOTATION COMPANIES [6211]
- **ORGANIZATION NAME:** 09 Crypto Assets
- **EIN:** 261482385
- **STATE OF INCORPORATION:** DE

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-95202
- **FILM NUMBER:** 251241167

**BUSINESS ADDRESS:**
- **STREET 1:** 7 ROSZEL ROAD
- **STREET 2:** FIFTH FLOOR, SUITE 1-A
- **CITY:** PRINCETON
- **STATE:** NJ
- **ZIP:** 08540
- **BUSINESS PHONE:** 609-897-7300

**MAIL ADDRESS:**
- **STREET 1:** 7 ROSZEL ROAD
- **STREET 2:** FIFTH FLOOR, SUITE 1-A
- **CITY:** PRINCETON
- **STATE:** NJ
- **ZIP:** 08540

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MIAMI INTERNATIONAL HOLDINGS INC
- **DATE OF NAME CHANGE:** 20080624
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Gallagher Thomas P.
- **CENTRAL INDEX KEY:** 0002080477

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D

**MAIL ADDRESS:**
- **STREET 1:** 7 ROSZEL RD, SUITE 1-A
- **CITY:** PRINCETON
- **STATE:** NJ
- **ZIP:** 08540

## Ex-99

![](jointfilingagreement1001.jpg)

Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13D (including any and all amendments thereto) with respect to the Common Stock, $0.001 par value per share, of Miami International Holding, Inc., and further agree that this Joint Filing Agreement shall be included as an exhibit to such joint filings. The undersigned further agree that each party hereto is responsible for the timely filing of such Statement on Schedule 13D and any amendments thereto, and for the accuracy and completeness of the information concerning such party contained therein; provided, however, that no party is responsible for the accuracy or completeness of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate. This Joint Filing Agreement may be signed in counterparts with the same effect as if the signature on each counterpart were upon the same instrument. IN WITNESS WHEREOF, the undersigned have executed this Agreement as of August 21, 2025. Gallagher Investments LLC, a New Jersey limited liability company By: /s/ Thomas P. Gallagher Name: Thomas P. Gallagher Title: Manager Thomas P. Gallagher /s/ Thomas P. Gallagher

------

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**Miami International Holdings, Inc. (the "Issuer")**

*(Name of Issuer)*

**Common Stock, $0.001 par value per share (the "Common Stock")**

*(Title of Class of Securities)*

**59356Q108**

*(CUSIP Number)*

**Thomas P. Gallagher**<br>c/o Miami International Holdings, Inc.<br>7 Roszel Road, Suite 1A<br>Princeton NJ 08540<br>6098977300

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**08/14/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **59356Q108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Thomas P. Gallagher** | Name of reporting person<br>**Thomas P. Gallagher** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**649101.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**3577356.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**649101.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**3577356.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**4226457.00** | Aggregate amount beneficially owned by each reporting person<br>**4226457.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**5.1%** | Percent of class represented by amount in Row (11)<br>**5.1%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **59356Q108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Gallagher Investments LLC** | Name of reporting person<br>**Gallagher Investments LLC** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**3577356.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**3577356.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**3577356.00** | Aggregate amount beneficially owned by each reporting person<br>**3577356.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.3%** | Percent of class represented by amount in Row (11)<br>**4.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, $0.001 par value per share (the "Common Stock")

**(b) Name of Issuer:**
Miami International Holdings, Inc. (the "Issuer")

**(c) Address of Issuer's Principal Executive Offices:**
7 Roszel Road, Suite 1A, Princeton, NJ, 08540

**Item 4. Purpose of Transaction**

The Reporting Persons acquired all of their securities for investment purposes only and are being held as a long-term investment. The Reporting Personsintend to continuously review their investment in the Issuer and may in the future determine to acquire additional securities of the Issuer or dispose of thesecurities of the Issuer owned by them or take any other available course of action, including surrendering or selling shares back to the Issuer for taxwithholding obligations. Notwithstanding anything contained herein, the Reporting Persons specifically reserve the right to change their intention with respectto any or all of such matters.

Mr. Gallagher is the Chairman and Chief Executive Officer of the Issuer and acquired his securities in that capacity. As a result, Mr. Gallagher may haveinfluence over the corporate activities of the Issuer, including activities that may relate to items described in subparagraphs (a) through (j) of Item 4 of
Schedule 13D.

The Reporting Persons do not have any present plans or proposals as of the date hereof that relate to or would result in any of the transactions describedin subparagraphs (a) through (j) of Item 4 of Schedule 13D.

**Item 5. Interest in Securities of the Issuer**

**(a)**
The Reporting Persons beneficially own an aggregate of 4,226,457 shares of Common Stock as follows: (i) 573,963 shares of Common Stock held by
Mr. Gallagher, (ii) 12,000 shares of Common Stock held by Mr. Gallagher jointly with his spouse, (iii) stock options exercisable for 63,138 shares of Common
Stock held by Mr. Gallagher, which are exercisable within 60 days of the date hereof, (iv) 2,040,494 shares of Common Stock held by Gallagher Investments,and (v) stock options exercisable for 1,536,862 shares of Common Stock held by Gallagher Investments, which are exercisable within 60 days of the datehereof. Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments.

The percentage ownership is based on 80,947,066 shares of Common Stock outstanding at the close of business on August 15, 2025.

**(b)**
Mr. Gallagher has the sole power to vote or to direct the vote, sole power to dispose or to direct the disposition of all shares beneficially owned by him andshares the power to vote or to direct the vote, and shares power to dispose or to direct the disposition of all shares beneficially owned by Gallagher Investments,of which Mr. Gallagher is the Manager.

**(c)**
Except as described under Item 3 above, the Reporting Person did not engage in any transactions in shares of the Issuer's Common Stock during thepast 60 days.

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

As the Chairman and Chief Executive Officer of the Issuer, Mr. Gallagher has in the past and may receive future compensation in the form of Common Stock,options or other securities convertible into Common Stock. The Reporting Persons have entered into agreements with the underwriters of the Issuer's initialpublic offering pursuant to which the Reporting Persons have agreed not to sell, transfer, pledge or otherwise dispose of any of the shares of common stockfor a period of 180 days after the date of the Issuer's initial public offering. There currently are no other contracts, arrangements, understandings or relationships
(legal or otherwise) between the Reporting Persons and any other person with respect to any securities of the Issuer, including, but not limited to, transfer orvoting of any other securities, finder's fees, joint ventures, loan or option arrangements, puts or calls, guarantees of profits, division of profits or loss, or thegiving or withholding of proxies.

Pursuant to Rule 13d-1(k) promulgated under the Exchange Act, the Reporting Persons have entered into an agreement attached hereto as Exhibit 1, withrespect to the joint filing of this Schedule 13D and any amendment or amendments hereto.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Thomas P. Gallagher

**Signature:** Thomas P. Gallagher

**Name/Title:** /s/ Thomas P. Gallagher, Individually

**Date:** 08/21/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Gallagher Investments LLC

**Signature:** Gallagher Investments LLC

**Name/Title:** /s/ Thomas P. Gallagher, Manager

**Date:** 08/21/2025