Kurt M. Eckert - 13 Aug 2025 Form 3 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Reporting relationship: Director
Issuer ticker: MIAX
Reported as of: 13 Aug 2025
Net transaction value: $0
SEC form: 3
Accepted by SEC: 13 Aug 2025, 17:07:41 UTC
Next SEC filing: 19 Aug 2025
Source filing: View source filing
Reporting owner signature: /s/Alessandra Maria Corona Henriques, Attorney-in-Fact

Key filing fact

Kurt M. Eckert filed Form 3 for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) on 13 Aug 2025.

Key facts

This page summarizes Kurt M. Eckert's Form 3 filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
0 reported transactions and 14 derivative rows are listed below.
Accepted by SEC: 13 Aug 2025, 17:07.

Change

No earlier filing in this sequence is available for direct comparison.
Current net transaction value: $0.

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

Official SEC source

Ownership activity is grounded in SEC Form 3 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: 13 Aug 2025

Reported non-derivative transactions

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

MIAX holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 120,500
Date: 13 Aug 2025
Ownership: Direct

Reported derivative securities

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

MIAX holding Derivative

Nonvoting Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 46,875
Exercise price
Footnotes: F1

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 12,917
Exercise price: $12.00
Footnotes: F2

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 17,188
Exercise price: $12.00
Footnotes: F2

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 18,000
Exercise price: $12.00
Footnotes: F2

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 22,812
Exercise price: $12.00
Footnotes: F2

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 125
Exercise price: $12.00
Footnotes: F2

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 30,156
Exercise price: $14.00
Footnotes: F2

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Nonvoting Common Stock
Underlying amount: 22,223
Exercise price: $16.14
Footnotes: F2

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 17,704
Exercise price: $25.98
Footnotes: F3

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 14,729
Exercise price: $19.84
Footnotes: F3

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 539
Exercise price: $20.60
Footnotes: F3

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 2,709
Exercise price: $20.60
Footnotes: F3

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 17,966
Exercise price: $20.00
Footnotes: F3

MIAX holding Derivative

Stock Option (Right to Buy)

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after
Date: 13 Aug 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 16,611
Exercise price: $22.34
Footnotes: F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

The shares of nonvoting common stock are convertible on a one-for-one basis into shares of common stock at any time. Of his 46,875 shares of nonvoting common stock, (i) 15,375 are held in his individual name and (ii) 31,500 are held jointly with his spouse with right of survivorship. The nonvoting common stock has no expiration date.

Footnote F2

The options are fully vested. The options were granted initially as the right to buy nonvoting common stock. On the closing date of the initial public offering of the Company's common stock, these will convert to the right to buy common stock instead of nonvoting common stock.

Footnote F3

The options are fully vested.

Footnote F4

8,307 of the shares subject to these options are vested, 4,152 of the shares subject to these options will vest on September 30, 2025 and the remaining 4,152 will vest on December 31, 2025, subject to the reporting person's continued service to the Issuer or its subsidiaries through the applicable vesting date.

SEC remarks

See Exhibit 24.1 - Power of Attorney

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