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MIAMI INTERNATIONAL (MIAX) director reports stock awards and vested option holdings

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. director Eric Sites reported equity compensation awards rather than open‑market trades. He received two grants of common stock classified as awards under code "A": one for 4,970 shares and another for 714 shares, both at a reported price of $0.00 per share. Following one grant, his directly held common stock position is 5,684 shares. Footnotes explain that some restricted stock units vested immediately on the grant date, while others are scheduled to vest on the last business day before the 2027 annual meeting, subject to his continued service. The filing also lists existing fully vested nonqualified stock options, including options over 9,174 shares at an exercise price of $20.00, 9,554 shares at $19.84, and 7,500-share blocks at $25.98 and $16.14, all expiring on March 26, 2030.

Positive

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Negative

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Insider Sites Eric
Role null
Type Security Shares Price Value
Grant/Award Common Stock 4,970 $0.00 --
Grant/Award Common Stock 714 $0.00 --
holding Nonqualified Stock Option (Right to Buy) -- -- --
holding Nonqualified Stock Option (Right to Buy) -- -- --
holding Nonqualified Stock Option (Right to Buy) -- -- --
holding Nonqualified Stock Option (Right to Buy) -- -- --
Holdings After Transaction: Common Stock — 5,684 shares (Direct, null); Nonqualified Stock Option (Right to Buy) — 7,500 shares (Direct, null)
Footnotes (1)
  1. The amount represents restricted stock units ("RSUs") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock. The amount represents RSUs that vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer through the vesting date. These options are fully vested.
Stock award 4,970 shares Common stock grant at $0.00 per share, code A
Additional stock award 714 shares Common stock grant at $0.00 per share, code A
Common shares held 5,684 shares Directly held common stock after one grant
Option position 9,174 shares at $20.00 Nonqualified stock option, expires March 26, 2030
Option position 9,554 shares at $19.84 Nonqualified stock option, expires March 26, 2030
Option position 7,500 shares at $25.98 Nonqualified stock option, expires March 26, 2030
Option position 7,500 shares at $16.14 Nonqualified stock option, expires March 26, 2030
restricted stock units financial
"The amount represents restricted stock units ("RSUs") that fully vested on the date of grant."
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
RSUs financial
"Each RSU represents a right to receive one share of the Issuer's common stock."
RSUs, or restricted stock units, are a form of company shares given to employees as part of their compensation. They are typically awarded with certain restrictions, such as a waiting period before they can be fully owned or sold, similar to earning a gift that becomes fully yours over time. For investors, RSUs can impact a company's stock offerings and reflect how much the company relies on stock-based incentives to attract and retain talent.
Nonqualified Stock Option (Right to Buy) financial
"Nonqualified Stock Option (Right to Buy)"
exercise price financial
"conversion_or_exercise_price": "20.0000""
The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.
fully vested financial
"These options are fully vested."
annual meeting of stockholders financial
"vest on the last business day immediately preceding the 2027 annual meeting of stockholders"
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FAQ

What insider transactions did MIAX director Eric Sites report in this Form 4?

Eric Sites reported equity awards, not open‑market trades. He received grants of 4,970 and 714 shares of common stock at $0.00 per share, increasing his directly held common stock while also disclosing existing fully vested option positions.

How many MIAX common shares does Eric Sites hold after the reported grant?

After one of the reported grants, Eric Sites directly holds 5,684 shares of MIAMI INTERNATIONAL HOLDINGS, INC. common stock. This reflects his updated ownership position from the Form 4 and does not include additional exposure through his outstanding option awards.

What restricted stock unit (RSU) terms are disclosed for MIAX director Eric Sites?

The filing notes RSUs that fully vested on the date of grant and additional RSUs that vest on the last business day immediately preceding the 2027 annual meeting, contingent on Eric Sites’ continued service with the company through that vesting date.

What nonqualified stock options does Eric Sites hold in MIAX according to this filing?

Eric Sites holds fully vested nonqualified stock options over 9,174 shares at $20.00, 9,554 shares at $19.84, and 7,500‑share blocks at $25.98 and $16.14. All these options are scheduled to expire on March 26, 2030, if not exercised earlier.

Does the MIAX Form 4 show Eric Sites buying or selling shares in the market?

The Form 4 does not show any open‑market purchases or sales. All reportable events are coded as awards or existing holdings, indicating equity compensation grants and previously established option positions rather than discretionary market trading activity.

Are Eric Sites’ MIAX stock options vested and when do they expire?

The footnotes state that the reported nonqualified stock options are fully vested. These options, covering multiple blocks of underlying MIAMI INTERNATIONAL HOLDINGS, INC. shares at various exercise prices, share a common stated expiration date of March 26, 2030.
SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
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*
Sites Eric

(Last)(First)(Middle)
470 PARK AVE S
8TH FLOOR SOUTH

(Street)
NEW YORK NEW YORK 10016

(City)(State)(Zip)

UNITED STATES

(Country)
2. Issuer Name and Ticker or Trading Symbol
MIAMI INTERNATIONAL HOLDINGS, INC. [ MIAX ]
5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
XDirector10% Owner
Officer (give title below)Other (specify below)
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026
6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Common Stock06/15/2026A714A$0714(1)D
Common Stock06/16/2026A4,970A$05,684(2)D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Nonqualified Stock Option (Right to Buy)(3)$16.1408/01/202103/26/2030Miami International Holdings Inc7,5000D
Nonqualified Stock Option (Right to Buy)(3)$25.9807/01/202203/26/2030Miami International Holdings Inc7,5000D
Nonqualified Stock Option (Right to Buy)(3)$19.8403/27/202303/26/2030Miami International Holdings Inc9,5540D
Nonqualified Stock Option (Right to Buy)(3)$2004/01/202403/26/2030Miami International Holdings Inc9,1740D
Explanation of Responses:
1. The amount represents restricted stock units ("RSUs") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock.
2. The amount represents RSUs that vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer through the vesting date.
3. These options are fully vested.
Remarks:
The Reporting Person, an employee of Horizon Kinetics Asset Management LLC and/or one of its affiliates (collectively, "HKAM"), is a member of the board of directors of the Issuer. HKAM has filed reports with the Securities and Exchange Commission reporting securities of the Issuer that it may be deemed to beneficially own. The Reporting Person does not exercise discretion of the securities of the Issuer and disclaims beneficial ownership that may be deemed to be beneficially owned by HKAM except to the extent of his pecuniary interest, if any.
/s/ Jay Kesslen, attorney-in-fact06/17/2026
** Signature of Reporting PersonDate
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.
* Form 4: SEC 1474 (03-26)