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

MIAMI International (MIAX) director exercises options and sells 5,250 shares

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

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert reported an option exercise paired with a share sale. He exercised stock options to acquire 5,250 shares of common stock at $12.00 per share, then sold 5,250 shares in an open-market transaction at a weighted average price of $42.76 per share. The sale was carried out under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025. Following these transactions, he directly holds 142,375 shares of common stock, and the exercised options are fully vested and exhausted for the exercised amount.

Positive

  • None.

Negative

  • None.
Insider Eckert Kurt M.
Role null
Sold 5,250 shs ($224K)
Type Security Shares Price Value
Exercise Stock Option (Right to Buy) 5,250 $0.00 --
Exercise Common Stock 5,250 $12.00 $63K
Sale Common Stock 5,250 $42.76 $224K
Holdings After Transaction: Stock Option (Right to Buy) — 6,313 shares (Direct, null); Common Stock — 147,625 shares (Direct, null)
Footnotes (1)
  1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025. This transaction was executed in multiple trades throughout the day at prices ranging from $41.46 to $43.99. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected. The options are fully vested
Shares sold 5,250 shares Open-market sale of common stock on June 2, 2026
Weighted average sale price $42.76 per share Common stock sale across multiple trades
Shares from option exercise 5,250 shares Common stock acquired via option exercise
Option exercise price $12.00 per share Conversion or exercise price for stock options
Post-transaction holdings 142,375 shares Common stock held directly after transactions
Net buy/sell shares -5,250 shares Net share change from reported trades
Rule 10b5-1 Plan regulatory
"This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person"
A Rule 10b5-1 plan is a prearranged, written schedule that lets corporate insiders buy or sell company stock at set times or amounts, even if they later learn material nonpublic information. Think of it like setting an automatic thermostat for trades: it creates a clear record that trades were planned in advance, reducing the risk of insider-trading accusations and helping investors trust that insider transactions are routine rather than based on secret information.
weighted average sale price financial
"The price reported above reflects the weighted average sale price."
Stock Option (Right to Buy) financial
"security_title: "Stock Option (Right to Buy)""
open-market sale financial
"transaction_action: "open-market sale""
An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.
derivative exercise/conversion financial
"transaction_action: "derivative exercise/conversion""
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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).
X
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*
Eckert Kurt M.
(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)
06/02/2026		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 Stock06/02/2026M(1)5,250A$12147,625D
Common Stock06/02/2026S(1)5,250D$42.76(2)142,375D
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
Stock Option (Right to Buy)$1206/02/2026M(1)5,250 (3)05/31/2027Common Stock5,250$06,313D
Explanation of Responses:
1. This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.
2. This transaction was executed in multiple trades throughout the day at prices ranging from $41.46 to $43.99. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.
3. The options are fully vested
Remarks:
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact06/04/2026
** 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 director Kurt M. Eckert report in this Form 4 transaction?

Kurt M. Eckert reported an option exercise and matching share sale. He exercised 5,250 stock options at $12.00 per share and sold 5,250 common shares at a weighted average of $42.76, reflecting an exercise-and-sell pattern under a pre-established trading plan.

How many MIAX shares did Kurt M. Eckert sell and at what price?

He sold 5,250 shares of MIAMI INTERNATIONAL HOLDINGS common stock. The sale occurred in multiple trades with prices from $41.46 to $43.99, and the reported weighted average sale price was $42.76 per share, according to the transaction disclosure and footnote details.

What stock options did Kurt M. Eckert exercise in this MIAX filing?

He exercised options covering 5,250 shares of MIAX common stock at a conversion or exercise price of $12.00 per share. The options were fully vested, and this exercise converted derivative holdings into common shares before the matching open-market sale.

How many MIAX shares does Kurt M. Eckert hold after the reported transactions?

After the transactions, Kurt M. Eckert directly holds 142,375 shares of MIAMI INTERNATIONAL HOLDINGS common stock. This figure reflects his position following the 5,250-share option exercise and the corresponding 5,250-share open-market sale reported in the Form 4.

Was the MIAX share sale by Kurt M. Eckert under a Rule 10b5-1 plan?

Yes. A footnote states the transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the reporting person on December 18, 2025. Such plans pre-schedule trades, making the timing more routine rather than discretionary.

What is the expiration date of the MIAX stock options involved in this Form 4?

The derivative entry shows the exercised stock options, labeled as “Stock Option (Right to Buy),” had an expiration date of May 31, 2027. The reported exercise of 5,250 options reduces the remaining option position associated with that grant ahead of expiration.