Judson Gray Teekell - 15 Aug 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Reporting relationship
Director
Issuer ticker
MIAX
Reported as of
15 Aug 2025
Net transaction value
$0
Source evidence Original filing metadata and source links for verification. 5 source fields
SEC form
4
Accepted by SEC
19 Aug 2025, 16:05:51 UTC
Prior SEC filing
13 Aug 2025
Next SEC filing
26 Mar 2026
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact

Key filing fact

Judson Gray Teekell filed Form 4 for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) on 19 Aug 2025.

Key facts

  • This page summarizes Judson Gray Teekell's Form 4 filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
  • 22 reported transactions and 18 derivative rows are listed below.
  • Accepted by SEC: 19 Aug 2025, 16:05.

Change

  • Previous filing in this sequence was filed on 13 Aug 2025.
  • 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

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001959770 Primary reporting owner

Teekell Judson Gray

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
19 Aug 2025

Reported non-derivative transactions

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

MIAX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares
+30,000
Change %
+93%
Price
Shares after
62,338
Date
15 Aug 2025
Ownership
Direct
Footnotes
F1, F2
MIAX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares
+31,242
Change %
+100%
Price
Shares after
62,338
Date
15 Aug 2025
Ownership
Direct
Footnotes
F1, F2
MIAX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares
+30,000
Change %
+53%
Price
Shares after
86,545
Date
15 Aug 2025
Ownership
By estate of Byrum W. Teekell
Footnotes
F1, F3, F4
MIAX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares
+38,131
Change %
+79%
Price
Shares after
86,545
Date
15 Aug 2025
Ownership
By estate of Byrum W. Teekell
Footnotes
F1, F3, F4

Reported derivative securities

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

MIAX transaction Derivative

Series B Preferred Stock

Conversion of derivative security

Transaction value
$0
Shares
-30,000
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
30,000
Exercise price
Footnotes
F1
MIAX transaction Derivative

Nonvoting Common Stock

Conversion of derivative security

Transaction value
$0
Shares
-31,242
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
31,242
Exercise price
Footnotes
F2
MIAX transaction Derivative

Series B Preferred Stock

Conversion of derivative security

Transaction value
$0
Shares
-30,000
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
By estate of Byrum W. Teekell
Underlying class
Common Stock
Underlying amount
30,000
Exercise price
Footnotes
F3
MIAX transaction Derivative

Nonvoting Common Stock

Conversion of derivative security

Transaction value
$0
Shares
-38,131
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
By estate of Byrum W. Teekell
Underlying class
Common Stock
Underlying amount
38,131
Exercise price
Footnotes
F4
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-22,667
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
22,667
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+22,667
Change %
Price
$0.000000
Shares after
22,667
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
22,667
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-13,500
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
13,500
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+13,500
Change %
Price
$0.000000
Shares after
13,500
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
13,500
Exercise price
$12.00
Footnotes
F5
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-12,833
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
12,833
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+12,833
Change %
Price
$0.000000
Shares after
12,833
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
12,833
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-12,500
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
12,500
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+12,500
Change %
Price
$0.000000
Shares after
12,500
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
12,500
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-5,000
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
5,000
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+5,000
Change %
Price
$0.000000
Shares after
5,000
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
5,000
Exercise price
$12.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-28,125
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
28,125
Exercise price
$14.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+28,125
Change %
Price
$0.000000
Shares after
28,125
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
28,125
Exercise price
$14.00
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-20,556
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
20,556
Exercise price
$16.14
Footnotes
F5, F6
MIAX transaction Derivative

Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+20,556
Change %
Price
$0.000000
Shares after
20,556
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
20,556
Exercise price
$16.14
Footnotes
F5, F6
* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 6 footnotes

Footnote F1

Includes 30,000 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date.

Footnote F2

Includes 31,242 shares of Nonvoting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date.

Footnote F3

Includes 30,000 shares of Series B Preferred Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date, and which are held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 22,500 shares of Common Stock The inclusion of such 22,500 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

Footnote F4

Includes 38,131 shares of Nonvoting Common Stock that have been converted into shares of Common Stock on a one-for-one basis upon the closing of the Company's initial public offering and which have no expiration date, which are held in the estate of Byrum W. Teekell for which J. Gray Teekell is executor and disclaims beneficial ownership as to 28,599 shares of Common Stock. The inclusion of such 28,599 shares in this report shall not be deemed an admission of beneficial ownership of the reported shares for purposes of Section 16 or for any other purpose.

Footnote F5

The options were granted initially as the right to buy Nonvoting Common Stock. On the closing date of the initial public offering, these converted to the right to buy Common Stock instead of Nonvoting Common Stock, for the same price and under the same conditions.

Footnote F6

The options are fully vested.

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