# EDGAR Filing Document

**Accession Number:** 0002080506
**File Stem:** 0002080506-26-000005
**Filing Date:** 2026-4
**Character Count:** 7113
**Document Hash:** 3a4f79950d0364661d32f71a5b279aab
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0002080506-26-000005.hdr.sgml**: 20260401

**ACCESSION NUMBER**: 0002080506-26-000005

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260330

**FILED AS OF DATE**: 20260401

**DATE AS OF CHANGE**: 20260401

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Brown Shelly
- **CENTRAL INDEX KEY:** 0002080506

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42805
- **FILM NUMBER:** 26829048

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

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Brown Shelly<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. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-30 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_EVP, Chief Strategy Officer_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>MIAMI INTERNATIONAL HOLDINGS, INC. [ MIAX ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<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

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2026-03-30 |  | F |  | 1809<sup>(1)</sup> | D | $37.50 | 297388 | D |  |
| Common Stock | 2026-03-30 |  | M |  | 8333 | A | $12 | 305721 | D |  |
| Common Stock | 2026-03-30 |  | M |  | 6570 | A | $15.22 | 312291 | D |  |
| Common Stock | 2026-03-30 |  | M |  | 6195 | A | $16.14 | 318486 | D |  |
| Common Stock | 2026-03-30 |  | M |  | 3878 | A | $25.78 | 322364 | D |  |
| Common Stock | 2026-03-30 |  | M |  | 5040 | A | $19.84 | 327404 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Incentive Stock Option (Right to Buy) | $12 | 2026-03-30 |  | M |  |  | 8333 | <sup>(2)</sup> | 2029-07-31 | Common Stock | 8333 | $0 | 0 | D |  |
| Incentive Stock Option (Right to Buy) | $15.22 | 2026-03-30 |  | M |  |  | 6570 | <sup>(2)</sup> | 2030-11-30 | Common Stock | 6570 | $0 | 0 | D |  |
| Incentive Stock Option (Right to Buy) | $16.14 | 2026-03-30 |  | M |  |  | 6195 | <sup>(2)</sup> | 2031-09-09 | Common Stock | 6195 | $0 | 0 | D |  |
| Incentive Stock Option (Right to Buy) | $25.78 | 2026-03-30 |  | M |  |  | 3878 | <sup>(2)</sup> | 2032-03-09 | Common Stock | 3878 | $0 | 0 | D |  |
| Incentive Stock Option (Right to Buy) | $19.84 | 2026-03-30 |  | M |  |  | 5040 | <sup>(2)</sup> | 2033-03-28 | Common Stock | 5040 | $0 | 0 | D |  |

---

### Footnotes:

(1) 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.

(2) The options are fully vested.

**Signature:** /s/Alessandra Maria Corona Henriques, Attorney-in-Fact  
**Date:** 2026-04-01

### 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.**