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

Reporting relationship
EVP, CISO and CRO
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, 16:06:44 UTC
Prior SEC filing
15 Aug 2025
Next SEC filing
11 Sep 2025
Source filing
View source filing
Reporting owner 1 detail
Reporting owner signature
/s/Alessandra Maria Corona Henriques, Attorney-in-Fact

Key filing fact

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

Key facts

  • This page summarizes Harish Jayabalan'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, 16:06.

Change

  • Previous filing in this sequence was filed on 15 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 0002080538 Primary reporting owner

Jayabalan Harish

Relationship
EVP, CISO and CRO
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 %
+1%
Price
Shares after
50,385
Date
15 Aug 2025
Ownership
Direct
Footnotes
F1
MIAX transaction

Common Stock

Conversion of derivative security

Transaction value
Shares
+43,442
Change %
+626%
Price
Shares after
50,385
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
-43,442
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
43,442
Exercise price
Footnotes
F2
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-21,999
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Series B Preferred Stock
Underlying amount
21,999
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Incentive Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+21,999
Change %
Price
$0.000000
Shares after
21,999
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
21,999
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 %
-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
-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
-3,001
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Series B Preferred Stock
Underlying amount
3,001
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+3,001
Change %
Price
$0.000000
Shares after
3,001
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
3,001
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-20,834
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
20,834
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+20,834
Change %
Price
$0.000000
Shares after
20,834
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
20,834
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-16,667
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
16,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+16,667
Change %
Price
$0.000000
Shares after
16,667
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
16,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-16,667
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
16,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+16,667
Change %
Price
$0.000000
Shares after
16,667
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
16,667
Exercise price
$12.00
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-23,430
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
23,430
Exercise price
$15.22
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+23,430
Change %
Price
$0.000000
Shares after
23,430
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
23,430
Exercise price
$15.22
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-26,304
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
26,304
Exercise price
$16.14
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+26,304
Change %
Price
$0.000000
Shares after
26,304
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
26,304
Exercise price
$16.14
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
-8,621
Change %
-100%
Price
$0.000000
Shares after
0
Date
15 Aug 2025
Ownership
Direct
Underlying class
Nonvoting Common Stock
Underlying amount
8,621
Exercise price
$25.78
Footnotes
F3, F4
MIAX transaction Derivative

Nonqualified Stock Option (Right to Buy)

Options Exercise

Transaction value
$0
Shares
+8,621
Change %
Price
$0.000000
Shares after
8,621
Date
15 Aug 2025
Ownership
Direct
Underlying class
Common Stock
Underlying amount
8,621
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 43,442 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. 4,500 of those shares are held jointly with his spouse with right of survivorship.

Footnote F3

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

Footnote F4

The options are fully vested.

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