# EDGAR Filing Document

**Accession Number:** 0001959770
**File Stem:** 0001628280-25-040221
**Filing Date:** 2025-8
**Character Count:** 13242
**Document Hash:** ff616e4aa8bd3e6b6ef82aee513dbe0d
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001628280-25-040221.hdr.sgml**: 20250813

**ACCESSION NUMBER**: 0001628280-25-040221

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 2

**CONFORMED PERIOD OF REPORT**: 20250813

**FILED AS OF DATE**: 20250813

**DATE AS OF CHANGE**: 20250813

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Teekell Judson Gray
- **CENTRAL INDEX KEY:** 0001959770

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42805
- **FILM NUMBER:** 251212814

**MAIL ADDRESS:**
- **STREET 1:** 8520 BUSINESS PARK DRIVE
- **CITY:** SHREVEPORT
- **STATE:** LA
- **ZIP:** 71105
**ISSUER**: 

**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

**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

## Ex-24

**Exhibit 24**

**POWER OF ATTORNEY**

Know all by these presents, with respect to holdings of and transactions in securities issued by Miami International Holdings, Inc. (the "<u>Company</u>"), that the undersigned hereby constitutes and appoints the individuals named on <u>Schedule A</u> attached hereto and as may be amended from time to time, or any of them signing singly, with full power of substitution and resubstitution, to act as the undersigned's true and lawful attorney-in-fact to:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1.prepare, execute in the undersigned's name and on the undersigned's behalf, and submit to the United States Securities and Exchange Commission (the "<u>SEC</u>") a Form ID, including amendments thereto, and any other documents necessary or appropriate to obtain and/or regenerate codes and passwords enabling the undersigned to make electronic filings with the SEC of reports required by Section 16(a) of the Securities Exchange Act of 1934, as amended, or any rule or regulation of the SEC;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2.execute for and on behalf of the undersigned, Forms 3, 4, and 5 in accordance with Section 16 of the Securities Exchange Act of 1934, as amended, and the rules thereunder;

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;3.do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Form 3, 4, or 5, complete and execute any amendment or amendments thereto, and timely file such form with the SEC and any stock exchange or similar authority; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;4.take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall contain such terms and conditions as such attorney-in-fact may approve in his or her discretion.

The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every act and thing whatsoever requisite, necessary, or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power of substitution and resubstitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorneys-in-fact substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of Attorney and the rights and powers herein granted.

The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned's responsibilities to comply with Section 16 of the Securities Exchange Act of 1934, as amended.

------

This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file Forms 3, 4, and 5 with respect to the undersigned's holdings of and transactions in securities issued by the Company, unless earlier revoked by the undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of August 4, 2025.

<u>/s/ J. Gray Teekell</u>

J. Gray Teekell

------

**<u>Schedule A</u>**

**Individuals Appointed as Attorney-in-Fact with Full Power of Substitution and Resubstitution**

1. Barbara J. Comly

2. Deborah Carroll

3. Alessandra Maria Corona Henriques

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

## FORM 3

### INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Teekell Judson Gray<br><sub>(Last) (First) (Middle)</sub><br>C/O MIAMI INTERNATIONAL HOLDINGS, INC.<br>7 ROSZEL ROAD, SUITE 1A<br><sub>(Street)</sub><br>PRINCETON, NJ 08540<br><sub>(City) (State) (Zip)</sub> | **3. Issuer Name and Ticker or Trading Symbol**<br>MIAMI INTERNATIONAL HOLDINGS, INC. [ MIAX ] | **5. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  |
| **2. Date of Event Requiring Statement (Month/Day/Year)**<br>2025-08-13 | **4. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director   [ ] 10% Owner<br>[ ] Officer (give title below)   [ ] Other (specify below)<br>_ _ | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities Beneficially Owned

---

|  |  |  |  |
| --- | --- | --- | --- |
| 1. Title of Security | 2. Amount of Securities Beneficially Owned | 3. Ownership Form | 4. Nature of Indirect Beneficial Ownership |
| Common Stock | 1096 | D |  |
| Common Stock | 18414<sup>(1)</sup> | I | By estate of Byrum W. Teekell |
| Common Stock | 57219<sup>(2)</sup> | I | By Teekell Oil & Gas, Inc. |
| Common Stock | 149744<sup>(3)</sup> | I | By Teekell Investments, LP |
| Common Stock | 18639<sup>(4)</sup> | I | By White Knight Communications, LP |

---

## Table II - Derivative Securities Beneficially Owned

---

|  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 2. Date Exercisable and Expiration Date (Month/Day/Year) | 3. Title and Amount of Underlying Securities | 3. Title and Amount of Underlying Securities | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 4. Conversion or Exercise Price | 5. Ownership Form | 6. Nature of Indirect Beneficial Ownership |
| Series B Preferred Stock | <sup>(5)</sup> | <sup>(5)</sup> | Common Stock | 30000 | <sup>(5)</sup> | D |  |
| Nonvoting Common Stock | <sup>(6)</sup> | <sup>(6)</sup> | Common Stock | 31242 | <sup>(6)</sup> | D |  |
| Series B Preferred Stock | <sup>(5)</sup> | <sup>(5)</sup> | Common Stock | 30000<sup>(7)</sup> | <sup>(5)</sup> | I | By estate of Byrum W. Teekell |
| Nonvoting Common Stock | <sup>(6)</sup> | <sup>(6)</sup> | Common Stock | 138131<sup>(8)</sup> | <sup>(6)</sup> | I | By estate of Byrum W. Teekell |
| Stock Option (Right to Buy) | <sup>(9)</sup> | 2026-06-19 | Nonvoting Common Stock | 22667 | $12 | D |  |
| Stock Option (Right to Buy) | <sup>(9)</sup> | 2027-05-31 | Nonvoting Common Stock | 13500 | $12 | D |  |
| Stock Option (Right to Buy) | <sup>(9)</sup> | 2028-04-30 | Nonvoting Common Stock | 12833 | $12 | D |  |
| Stock Option (Right to Buy) | <sup>(9)</sup> | 2029-05-31 | Nonvoting Common Stock | 12500 | $12 | D |  |
| Stock Option (Right to Buy) | <sup>(9)</sup> | 2029-06-30 | Nonvoting Common Stock | 5000 | $12 | D |  |
| Stock Option (Right to Buy) | <sup>(9)</sup> | 2030-06-30 | Nonvoting Common Stock | 28125 | $14 | D |  |
| Stock Option (Right to Buy) | <sup>(9)</sup> | 2031-05-31 | Nonvoting Common Stock | 20556 | $16.14 | D |  |
| Stock Option (Right to Buy) | <sup>(10)</sup> | 2032-06-30 | Common Stock | 9247 | $25.98 | D |  |
| Stock Option (Right to Buy) | <sup>(10)</sup> | 2033-03-26 | Common Stock | 5783 | $19.84 | D |  |

---

### Footnotes:

(1) 18,414 shares of common stock held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 13,811 shares of common stock. The inclusion of such 13,811 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

(2) 57,219 shares of common stock held by Teekell Oil & Gas, Inc. as to which J. Gray Teekell is the president and a stockholder and disclaims beneficial ownership as to 42,914 of such shares. The inclusion of such 42,914 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

(3) 149,744 shares of common stock held by Teekell Investments, LP as to which J. Gray Teekell is a limited partner and successor trustee of the trust that serves as its general partner and he disclaims beneficial ownership as to 112,308 of such shares. The inclusion of such 112,308 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

(4) 18,639 shares of common stock, held by White Knight Communications, LP in which J. Gray Teekell is a limited partner and successor trustee of the trust that serves as its general partner and he disclaims beneficial ownership as to 16,309 of such shares. The inclusion of such 16,309 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

(5) The shares of Series B Preferred Stock are convertible on a one-for-one basis into shares of common stock commencing at the time of the Company's initial public offering ("IPO") effective date, which is August 13, 2025. The Series B Preferred Stock has no expiration date.

(6) The shares of nonvoting common stock are convertible on a one-for-one basis into shares of common stock commencing at any time. The nonvoting common stock has no expiration date.

(7) 30,000 shares of Series B preferred stock, held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 22,500 shares of Series B preferred stock. The inclusion of such 22,500 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

(8) 38,132 shares of nonvoting common stock held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 28,599 shares of nonvoting commonstock. The inclusion of such 28,599 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

(9) The options are fully vested. The options were granted initially as the right to buy nonvoting common stock. On the closing date of the IPO, these will convert to the right to buy common stock instead of nonvoting common stock.

(10) The options are fully vested.

**Remarks:**
See Exhibit 24.1 - Power of Attorney

**Signature:** /s/Alessandra Maria Corona Henriques, Attorney-in-Fact  
**Date:** 2025-08-13

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**