STOCK TITAN

Director at Miami International (MIAX) sells 5,250 shares after option exercise

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

Rhea-AI Filing Summary

MIAMI INTERNATIONAL HOLDINGS, INC. director Kurt M. Eckert 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 an average price of $39.35 on July 2, 2026.

These trades were made under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025. Following the transactions, Eckert directly holds 149,612 shares of common stock and 1,063 stock options.

Positive

  • None.

Negative

  • None.
Insider Eckert Kurt M.
Role Director
Sold 5,250 shs ($207K)
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 $39.35 $207K
Holdings After Transaction: Stock Option (Right to Buy) — 1,063 shares (Direct); Common Stock — 154,862 shares (Direct)
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. The options are fully vested
Shares sold 5,250 shares Open-market sale of common stock on July 2, 2026
Sale price $39.35 per share Average sale price for 5,250 common shares
Option exercise price $12.00 per share Strike price for 5,250 stock options exercised
Shares held after 149,612 shares Common stock directly owned after transactions
Options remaining 1,063 options Stock options directly owned after exercise
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.
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 security financial
"transaction_code_description": "Exercise or conversion of derivative security""
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
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FAQ

What insider transactions did MIAX director Kurt M. Eckert report?

Kurt M. Eckert reported exercising stock options for 5,250 MIAX shares at $12.00 each and selling 5,250 shares at $39.35. The paired exercise-and-sale converted options into cash while keeping his equity position active.

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

He sold 5,250 shares of MIAX common stock at an average price of $39.35 per share. This was an open-market sale completed on July 2, 2026, immediately after exercising the same number of stock options.

Did Kurt M. Eckert exercise MIAX stock options in this Form 4 filing?

Yes. He exercised stock options covering 5,250 MIAX shares at a strike price of $12.00 per share. The options were fully vested, and the exercise preceded the sale of an equivalent number of common shares that same day.

Were Kurt M. Eckert’s MIAX share sales made under a Rule 10b5-1 plan?

Yes. The filing states the transaction was executed under a previously established Rule 10b5-1 trading plan adopted on December 18, 2025. Such plans pre-schedule trades, making their timing more routine and less discretionary.

What are Kurt M. Eckert’s MIAX holdings after these transactions?

After the reported transactions, he directly holds 149,612 MIAX common shares and 1,063 stock options. This indicates he retains a substantial equity interest in the company even after the option exercise and related open-market share sale.
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)
07/02/2026
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 Stock07/02/2026M(1)5,250A$12154,862D
Common Stock07/02/2026S(1)5,250D$39.35149,612D
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)$1207/02/2026M(1)5,250 (2)05/31/2027Common Stock5,250$01,063D
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. The options are fully vested
Remarks:
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact07/07/2026
** 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)