STOCK TITAN

MIAX (MIAX) EVP John Smollen receives new RSU and stock option grants

(Neutral)
(Neutral)
Form Type
4

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. executive John Smollen, EVP of New Product Development, received equity-based compensation in the form of stock and options. He was granted 7,455 shares of Common Stock as restricted stock units that vest in three equal installments on June 16, 2027, June 16, 2028, and June 16, 2029, subject to continued service. He also received Nonqualified and Incentive Stock Options covering a total of 7,669 shares at an exercise price of $40.2400 per share, vesting over the same dates. Following these grants, he directly owns 178,212 Common shares.

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Insider Smollen John
Role EVP, New Product Development
Type Security Shares Price Value
Grant/Award Incentive Stock Option (Right to Buy) 2,485 $0.00 $0.00
Grant/Award Nonqualified Stock Option (Right to Buy) 5,184 $0.00 $0.00
Grant/Award Common Stock 7,455 $0.00 $0.00
Holdings After Transaction: Incentive Stock Option (Right to Buy) — 2,485 shares (Direct); Nonqualified Stock Option (Right to Buy) — 5,184 shares (Direct); Common Stock — 178,212 shares (Direct)
Footnotes (3)
  1. F1. The amount represents restricted stock units ("RSUs") that vest as to 2,485 on June 16, 2027, 2,485 on June 16, 2028 and the remaining 2,485 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through each applicable vesting date.
  2. F2. 829 of the shares subject to this option will vest on June 16, 2027, 828 of the shares subject to this option will vest on June 16, 2028 and the remaining 828 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.
  3. F3. 1,728 of the shares subject to this option will vest on June 16, 2027, 1,728 of the shares subject to this option will vest on June 16, 2028 and the remaining 1,728 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.
RSU grant 7,455 shares Common Stock RSUs granted on June 16, 2026
Nonqualified Stock Option 5,184 shares Right to buy Common Stock at $40.2400
Incentive Stock Option 2,485 shares Right to buy Common Stock at $40.2400
Option exercise price $40.2400 per share Applies to both option grants
Shares held after grants 178,212 shares Common Stock directly owned after transactions
Nonqualified Option expiration June 15, 2036 Expiration date for 5,184-share option
Incentive Option expiration June 15, 2036 Expiration date for 2,485-share option
restricted stock units ("RSUs") financial
"The amount represents restricted stock units ("RSUs") that vest as to 2,485 on June 16, 2027..."
Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.
Nonqualified Stock Option financial
"Nonqualified Stock Option (Right to Buy) with 5,184 shares at a $40.2400 exercise price..."
Incentive Stock Option financial
"Incentive Stock Option (Right to Buy) with 2,485 shares at a $40.2400 exercise price..."
An incentive stock option is a type of employee benefit that gives a worker the right to buy company shares at a fixed price, with special tax advantages if the employee holds the shares for a required period. Think of it as a coupon to buy future shares at today’s price that can result in lower tax on the gain. Investors care because ISOs can dilute share count, align staff incentives with the stock price, and affect company compensation costs and the timing of potential share sales.
exercise price financial
"conversion_or_exercise_price: "40.2400" for both option awards..."
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.
vesting date financial
"subject to the Reporting Person's continued service through each applicable vesting date."

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FAQ

What did MIAX executive John Smollen report in this Form 4?

John Smollen reported equity compensation awards, not open-market trades. He received 7,455 Common Stock RSUs and stock options on 7,669 shares, all granted on June 16, 2026, subject to future vesting and continued service.

How many MIAX shares does John Smollen hold after these grants?

After these awards, John Smollen directly holds 178,212 shares of MIAX Common Stock. This figure reflects his updated ownership position reported in the filing, excluding the additional shares underlying unexercised stock options that may vest and become exercisable later.

What restricted stock units did John Smollen receive from MIAX?

He received 7,455 MIAX restricted stock units, described as Common Stock that vests in three equal tranches. Vesting covers 2,485 units on June 16, 2027, 2,485 on June 16, 2028, and 2,485 on June 16, 2029, if his service continues.

What stock options were granted to John Smollen by MIAX?

MIAX granted him two option awards totaling 7,669 shares of Common Stock at a strike price of $40.2400 per share. One is a 5,184-share Nonqualified Stock Option and the other a 2,485-share Incentive Stock Option, each vesting in three annual installments.

When do John Smollen’s MIAX stock options vest and expire?

Both option awards vest over three years, with specified share amounts vesting on June 16, 2027, June 16, 2028, and June 16, 2029. Each option grant carries an expiration date of June 15, 2036, if not earlier exercised or forfeited under applicable terms.

Are John Smollen’s MIAX equity awards linked to continued employment?

Yes. The RSUs and option vesting schedules are conditioned on his continued service to MIAMI INTERNATIONAL HOLDINGS, INC. or its subsidiaries. Footnotes state vesting on the 2027, 2028, and 2029 dates occurs only if he remains in service through each vesting date.
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*
Smollen John

(Last)(First)(Middle)
C/O MIAMI INTERNATIONAL HOLDINGS, INC.
7 ROSZEL ROAD, SUITE 1A

(Street)
PRINCETON NEW JERSEY 08540

(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
EVP, New Product Development
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
06/16/2026
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 Stock06/16/2026A7,455(1)A$0178,212D
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
Incentive Stock Option (Right to Buy)$40.2406/16/2026A2,485 (2)06/15/2036Common Stock2,485$02,485D
Nonqualified Stock Option (Right to Buy)$40.2406/16/2026A5,184 (3)06/15/2036Common Stock5,184$05,184D
Explanation of Responses:
1. The amount represents restricted stock units ("RSUs") that vest as to 2,485 on June 16, 2027, 2,485 on June 16, 2028 and the remaining 2,485 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through each applicable vesting date.
2. 829 of the shares subject to this option will vest on June 16, 2027, 828 of the shares subject to this option will vest on June 16, 2028 and the remaining 828 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.
3. 1,728 of the shares subject to this option will vest on June 16, 2027, 1,728 of the shares subject to this option will vest on June 16, 2028 and the remaining 1,728 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.
Remarks:
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact06/18/2026
** 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)