Shelly Brown - 15 Aug 2025 Form 4 Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Reporting relationship
EVP, Strat. Planning & BD
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, 16:07:13 UTC
Prior SEC filing
13 Aug 2025
Next SEC filing
28 Aug 2025
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact

Key filing fact

Shelly Brown filed Form 4 for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) on 19 Aug 2025.

Key facts

  • This page summarizes Shelly Brown's Form 4 filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
  • 32 reported transactions and 30 derivative rows are listed below.
  • Accepted by SEC: 19 Aug 2025, 16:07.

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 0002080506 Primary reporting owner

Brown Shelly

Relationship
EVP, Strat. Planning & BD
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
+500
Change %
+0.15%
Price
Shares after
339,029
Date
15 Aug 2025
Ownership
Direct
Footnotes
F1
MIAX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares
+200,475
Change %
+145%
Price
Shares after
339,029
Date
15 Aug 2025
Ownership
Direct
Footnotes
F2

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
-500
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
500
Exercise price
Footnotes
F1
MIAX transaction Derivative

Nonvoting Common Stock

Conversion of derivative security

Transaction value
$0
Shares
-200,475
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
200,475
Exercise price
Footnotes
F2
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-16,666
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
16,666
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+16,666
Change %
Price
$0.000000
Shares after
16,666
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
16,666
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-8,333
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
8,333
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+8,333
Change %
Price
$0.000000
Shares after
8,333
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
8,333
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-8,333
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
8,333
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+8,333
Change %
Price
$0.000000
Shares after
8,333
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
8,333
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-8,333
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
8,333
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+8,333
Change %
Price
$0.000000
Shares after
8,333
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
8,333
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-6,570
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
6,570
Exercise price
$15.22
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+6,570
Change %
Price
$0.000000
Shares after
6,570
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
6,570
Exercise price
$15.22
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-6,195
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
6,195
Exercise price
$16.14
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+6,195
Change %
Price
$0.000000
Shares after
6,195
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
6,195
Exercise price
$16.14
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-3,878
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
3,878
Exercise price
$25.78
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+3,878
Change %
Price
$0.000000
Shares after
3,878
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
3,878
Exercise price
$25.78
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-65,334
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
65,334
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+65,334
Change %
Price
$0.000000
Shares after
65,334
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
65,334
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-41,667
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
41,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+41,667
Change %
Price
$0.000000
Shares after
41,667
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
41,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-91,667
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
91,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+91,667
Change %
Price
$0.000000
Shares after
91,667
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
91,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-141,667
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
141,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+141,667
Change %
Price
$0.000000
Shares after
141,667
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
141,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-143,430
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
143,430
Exercise price
$15.22
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+143,430
Change %
Price
$0.000000
Shares after
143,430
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
143,430
Exercise price
$15.22
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-18,804
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
18,804
Exercise price
$16.14
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+18,804
Change %
Price
$0.000000
Shares after
18,804
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
18,804
Exercise price
$16.14
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-46,121
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
46,121
Exercise price
$25.78
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+46,121
Change %
Price
$0.000000
Shares after
46,121
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
46,121
Exercise price
$25.78
Footnotes
F3, 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

Represents 500 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 ("IPO") and which have no expiration date.

Footnote F2

Represents 200,475 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 IPO and which have no expiration date.

Footnote F3

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

Footnote F4

The options are fully vested.

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