Kurt M. Eckert - 19 Mar 2026 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Reporting relationship: Director
Issuer ticker: MIAX
Reported as of: 19 Mar 2026
Net transaction value: -$1,478,763
SEC form: 4
Accepted by SEC: 20 Mar 2026, 16:48:28 UTC
Prior SEC filing: 19 Aug 2025
Next SEC filing: 05 May 2026
Source filing: View source filing
Reporting owner signature: /s/Alessandra Maria Corona Henriques, Attorney-in-Fact

Key filing fact

Kurt M. Eckert filed Form 4 for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) on 20 Mar 2026.

Key facts

This page summarizes Kurt M. Eckert's Form 4 filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 20 Mar 2026, 16:48.

Change

Previous filing in this sequence was filed on 19 Aug 2025.
Current net transaction value: -$1,478,763.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002080678 Primary reporting owner

Eckert Kurt M.

Relationship: Director
Address: C/O MIAMI INTERNATIONAL HOLDINGS, INC., 7 ROSZEL ROAD, SUITE 1A, PRINCETON
Signature: /s/Alessandra Maria Corona Henriques, Attorney-in-Fact
Signature date: 20 Mar 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MIAX transaction

Common Stock

Options Exercise

Transaction value
Shares: +12,917
Change %: +7.7%
Price: $12.00^*
Shares after: 180,292
Date: 19 Mar 2026
Ownership: Direct

MIAX transaction

Common Stock

Sale

Transaction value: $1,478,763
Shares: -37,917
Change %: -21%
Price: $39.00
Shares after: 142,375
Date: 19 Mar 2026
Ownership: Direct
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -12,917
Change %: -100%
Price: $12.00^*
Shares after: 0
Date: 19 Mar 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 12,917
Exercise price: $12.00
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote F1

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the reporting person on December 18, 2025.

Footnote F2

This transaction was executed in multiple trades throughout the day at prices ranging from $38.62 to $39.48. 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.

Footnote F3

The options are fully vested.