# EDGAR Filing Document

**Accession Number:** 0001769842
**File Stem:** 0001437749-26-013625
**Filing Date:** 2026-4
**Character Count:** 5386
**Document Hash:** 7aa1a719dc7ea627ff42d490b33deaf6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001437749-26-013625.hdr.sgml**: 20260428

**ACCESSION NUMBER**: 0001437749-26-013625

**CONFORMED SUBMISSION TYPE**: 3

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260424

**FILED AS OF DATE**: 20260428

**DATE AS OF CHANGE**: 20260428

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Sites Eric
- **CENTRAL INDEX KEY:** 0001769842

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 3
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-42805
- **FILM NUMBER:** 26906846

**MAIL ADDRESS:**
- **STREET 1:** C/O RENN FUND, INC.
- **STREET 2:** 470 PARK AVE S 8TH FL S
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10016
**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 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>Sites Eric<br><sub>(Last) (First) (Middle)</sub><br>470 PARK AVE S<br>8TH FLOOR SOUTH<br><sub>(Street)</sub><br>NEW YORK, NY 10016<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>2026-04-24 | **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 |

---

## 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 |
| Nonqualified Stock Option (Right to Buy)<sup>(1)</sup> | 2021-08-01 | 2030-03-26 | Miami International Holdings Inc | 7500 | $16.1400 | D<sup>(2)(3)</sup> |  |
| Nonqualified Stock Option (Right to Buy)<sup>(1)</sup> | 2022-07-01 | 2030-03-26 | Miami International Holdings Inc | 7500 | $25.9800 | D<sup>(2)(3)</sup> |  |
| Nonqualified Stock Option (Right to Buy)<sup>(1)</sup> | 2023-03-27 | 2030-03-26 | Miami International Holdings Inc | 9554 | $19.8400 | D<sup>(2)(3)</sup> |  |
| Nonqualified Stock Option (Right to Buy)<sup>(1)</sup> | 2024-04-01 | 2030-03-26 | Miami International Holdings Inc | 9174 | $20.0000 | D<sup>(2)(3)</sup> |  |

---

### Footnotes:

(1) These options are fully vested.

(2) On April 24, 2026, Eric Sites, who serves as a Managing Director of Horizon Kinetics Asset Management LLC (HKAM), was elected to the Board of Directors of the Issuer.  Mr. Sites does not exercise investment discretion on behalf of HKAM with respect to the securities of the Issuer.

(3) On April 28, 2026, HKAM filed an amendment to its Schedule 13D wherein it reported beneficial ownership of 11,162,809 shares.

**Signature:** /s/Jay Kesslen, attorney-in-fact  
**Date:** 2026-04-28

### 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.**