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Director at MIAMI International (MIAX) receives new stock and option grants

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

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. director Kenneth W. Lozier reported equity compensation awards rather than open-market trades. He received 4,970 fully vested restricted stock units and an additional 2,267 RSUs that vest before the 2027 annual meeting, each RSU equal to one common share. He was also granted a nonqualified stock option for 2,571 shares at an exercise price of $40.24 per share, vesting in staged amounts during 2026. Following these grants, he directly holds 8,237 shares of common stock and 2,571 stock options.

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Insider Lozier Kenneth W.
Role Director
Type Security Shares Price Value
Grant/Award Nonqualified Stock Option (Right to Buy) 2,571 $0.00 --
Grant/Award Common Stock 4,970 $0.00 --
Grant/Award Common Stock 2,267 $0.00 --
Holdings After Transaction: Nonqualified Stock Option (Right to Buy) — 2,571 shares (Direct); Common Stock — 8,237 shares (Direct)
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. 1,285 of the shares subject to this option will vest on June 30, 2026, 643 of the shares subject to this option will vest on September 30, 2026 and the remaining 643 of the shares subject to this option will vest on December 31, 2026, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.
Fully vested RSUs 4,970 shares RSUs that vested on grant date
Additional RSU grant 2,267 shares RSUs vesting before 2027 annual meeting
Stock option grant size 2,571 options Nonqualified stock option on common stock
Stock option exercise price $40.24 per share Conversion or exercise price
Common shares held after grants 8,237 shares Direct ownership after transactions
Options held after grants 2,571 options Total options following transaction
First option vesting tranche 1,285 shares Vests on June 30, 2026
Later option vesting tranches 643 + 643 shares Vests on September 30 and December 31, 2026
restricted stock units ("RSUs") financial
"The amount represents restricted stock units ("RSUs") that fully vested on the date of grant."
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)"
exercise price financial
"conversion_or_exercise_price": "40.2400""
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 financial
"RSUs that vest on the last business day immediately preceding the 2027 annual meeting"
Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.
annual meeting of stockholders financial
"immediately preceding the 2027 annual meeting of stockholders"
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FAQ

What equity awards did MIAX director Kenneth W. Lozier receive?

Kenneth W. Lozier received equity compensation, not open-market trades. He was granted 4,970 fully vested restricted stock units, 2,267 additional RSUs that vest before the 2027 annual meeting, and a nonqualified stock option covering 2,571 shares at a $40.24 exercise price.

How many MIAX shares does Kenneth W. Lozier hold after these grants?

After these awards, Kenneth W. Lozier directly holds 8,237 shares of MIAX common stock. He also holds a nonqualified stock option for 2,571 underlying shares, providing additional potential equity exposure if the option later becomes economically attractive to exercise.

What are the vesting terms of Kenneth W. Lozier’s MIAX RSU awards?

Lozier’s RSU awards have two structures. One grant of 4,970 RSUs vested in full on the grant date. A separate 2,267 RSU grant vests on the last business day immediately before the 2027 annual stockholders’ meeting, contingent on his continued service to the company.

What are the key terms of Kenneth W. Lozier’s MIAX stock option grant?

The nonqualified stock option covers 2,571 shares of MIAX common stock at a $40.24 exercise price. Vesting is staged in 2026: 1,285 shares on June 30, 643 shares on September 30, and 643 shares on December 31, subject to continued service.

Does this MIAX Form 4 show Kenneth W. Lozier buying or selling shares?

The Form 4 reflects equity awards, not market transactions. All three entries are coded as grants or awards, representing RSUs and options provided as compensation. There are no reported open-market purchases or sales of MIAX common stock in this filing.
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*
Lozier Kenneth W.

(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)
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 Stock06/15/2026A2,267(1)A$03,267D
Common Stock06/16/2026A4,970(2)A$08,237D
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)$40.2406/16/2026A2,571 (3)06/15/2036Common Stock2,571$02,571D
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. 1,285 of the shares subject to this option will vest on June 30, 2026, 643 of the shares subject to this option will vest on September 30, 2026 and the remaining 643 of the shares subject to this option will vest on December 31, 2026, 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-Fact06/17/2026
** 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)