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  4. [Form 4] MIAMI INTERNATIONAL HOLDINGS, INC. Insider Trading Activity

Miami International (MIAX) EVP awarded new RSUs and stock options

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

Rhea-AI Filing Summary

Miami International Holdings EVP, GC & Corporate Secretary Barbara J. Comly received new equity awards. She was granted 39,140 shares of Common Stock in the form of restricted stock units, which vest in three installments: 13,048 shares on June 16, 2027, 13,046 on June 16, 2028, and 13,046 on June 16, 2029, contingent on continued service.

She also received a nonqualified stock option for 37,778 shares and an incentive stock option for 2,485 shares of Common Stock, both with a $40.24 exercise price and expiring on June 15, 2036. These options vest in annual tranches from June 16, 2027 through June 16, 2029. Following these awards, Comly directly owns 882,984 shares of Common Stock. The filing reports no sales, indicating routine compensation-related grants rather than open-market purchases or sales.

Positive

  • None.

Negative

  • None.
Insider Comly Barbara J.
Role EVP, GC & Corporate Secretary
Type Security Shares Price Value
Grant/Award Incentive Stock Option (Right to Buy) 2,485 $0.00 --
Grant/Award Nonqualified Stock Option (Right to Buy) 37,778 $0.00 --
Grant/Award Common Stock 39,140 $0.00 --
Holdings After Transaction: Incentive Stock Option (Right to Buy) — 2,485 shares (Direct, null); Nonqualified Stock Option (Right to Buy) — 37,778 shares (Direct, null); Common Stock — 882,984 shares (Direct, null)
Footnotes (1)
  1. The amount represents restricted stock units ("RSUs") that vest as to 13,048 shares on June 16, 2027, 13,046 on June 16, 2028 and the remaining 13,046 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date. 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. 12,594 of the shares subject to this option will vest on June 16, 2027, 12,592 of the shares subject to this option will vest on June 16, 2028 and the remaining 12,592 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 39,140 shares Restricted stock units granted June 16, 2026
RSU vesting 2027 13,048 shares RSUs vesting June 16, 2027
RSU vesting 2028 13,046 shares RSUs vesting June 16, 2028
RSU vesting 2029 13,046 shares RSUs vesting June 16, 2029
Nonqualified stock option 37,778 shares at $40.24 Option grant expiring June 15, 2036
Incentive stock option 2,485 shares at $40.24 Option grant expiring June 15, 2036
Shares owned after grants 882,984 shares Direct common stock ownership after transactions
restricted stock units ("RSUs") financial
"The amount represents restricted stock units ("RSUs") that vest as to 13,048 shares 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)"
Incentive Stock Option financial
"Incentive Stock Option (Right to Buy)"
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.
vesting financial
"will vest on June 16, 2027, 12,592 of the shares subject to this option will vest on June 16, 2028..."
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.
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Form 4 Insider Transactions: What Each Field Means →
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*
Comly Barbara J.
(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, GC & Corporate Secretary
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 Stock06/16/2026A39,140(1)A$0882,984D
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)$40.2406/16/2026A37,778 (3)06/15/2036Common Stock37,778$037,778D
Explanation of Responses:
1. The amount represents restricted stock units ("RSUs") that vest as to 13,048 shares on June 16, 2027, 13,046 on June 16, 2028 and the remaining 13,046 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the 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. 12,594 of the shares subject to this option will vest on June 16, 2027, 12,592 of the shares subject to this option will vest on June 16, 2028 and the remaining 12,592 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)

Source: View Original Filing on SEC EDGAR

FAQ

What did MIAX executive Barbara Comly receive in this Form 4 filing?

Barbara J. Comly received equity-based compensation awards, including 39,140 restricted stock units and new stock options. These awards are tied to her ongoing service as EVP, General Counsel and Corporate Secretary at Miami International Holdings.

How many restricted stock units did MIAX grant to Barbara Comly?

She was granted 39,140 restricted stock units. These RSUs vest in three annual installments in 2027, 2028, and 2029, with each tranche subject to her continued service with Miami International Holdings or its subsidiaries.

What stock options did Barbara Comly receive from MIAX and at what price?

Comly received a nonqualified stock option for 37,778 shares and an incentive stock option for 2,485 shares. Both option grants have a $40.24 per-share exercise price and expire on June 15, 2036, with vesting tied to future service.

When do Barbara Comly’s new MIAX equity awards vest?

The 39,140 RSUs vest in annual installments on June 16 of 2027, 2028, and 2029. The option grants likewise vest in tranches over the same dates, each subject to Comly’s continued service with Miami International Holdings or its subsidiaries.

How many MIAX shares does Barbara Comly hold after these transactions?

After the reported grants, Comly directly owns 882,984 shares of Miami International Holdings common stock. This figure reflects her holdings following the addition of 39,140 RSUs, without any reported sales or dispositions in this Form 4.

Were there any MIAX share sales or open-market trades in this Form 4?

No sales or open-market trades were reported. All three transactions are coded as grants or awards, indicating compensation-related acquisitions of restricted stock units and stock options rather than discretionary buying or selling in the market.