Key facts
- This page summarizes Cynthia Schwarzkopf's Form 4 filing for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX).
- 16 reported transactions and 14 derivative rows are listed below.
- Accepted by SEC: 19 Aug 2025, 16:05.
Cynthia Schwarzkopf - 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
- SEC form
- 4
- Accepted by SEC
- 19 Aug 2025, 16:05:24 UTC
- Prior SEC filing
- 13 Aug 2025
- Next SEC filing
- 12 Jun 2026
- Source filing
- View source filing
- Reporting owner signature
- /s/Alessandra Maria Corona Henriques, Attorney-in-Fact
Source evidence
Original filing metadata and source links for verification.
5 source fields
Reporting owner
1 detail
Key filing fact
Cynthia Schwarzkopf filed Form 4 for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) on 19 Aug 2025.
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
View source filing
Ownership activity is grounded in SEC Form 4 disclosures.
Reporting Owners (1)
CIK 0002080596
Primary reporting owner
Schwarzkopf Cynthia
- 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
- +36,250
- Change %
- +80%
- Price
- Shares after
- 81,308
- Date
- 15 Aug 2025
- Ownership
- Direct
- Footnotes
- F1, F2
MIAX
transaction
Common Stock
Conversion of derivative security
- Transaction value
- Shares
- +45,058
- Change %
- +124%
- Price
- Shares after
- 81,308
- Date
- 15 Aug 2025
- Ownership
- Direct
- Footnotes
- F1, 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
- -36,250
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 36,250
- Exercise price
- Footnotes
- F1
MIAX
transaction
Derivative
Nonvoting Common Stock
Conversion of derivative security
- Transaction value
- $0
- Shares
- -45,058
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 45,058
- Exercise price
- Footnotes
- F2
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -19,500
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Nonvoting Common Stock
- Underlying amount
- 19,500
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- +19,500
- Change %
- Price
- $0.000000
- Shares after
- 19,500
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 19,500
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -21,916
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Nonvoting Common Stock
- Underlying amount
- 21,916
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- +21,916
- Change %
- Price
- $0.000000
- Shares after
- 21,916
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 21,916
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -21,250
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Nonvoting Common Stock
- Underlying amount
- 21,250
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- +21,250
- Change %
- Price
- $0.000000
- Shares after
- 21,250
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 21,250
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -22,708
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Nonvoting Common Stock
- Underlying amount
- 22,708
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- +22,708
- Change %
- Price
- $0.000000
- Shares after
- 22,708
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 22,708
- Exercise price
- $12.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -28,437
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Nonvoting Common Stock
- Underlying amount
- 28,437
- Exercise price
- $14.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- +28,437
- Change %
- Price
- $0.000000
- Shares after
- 28,437
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 28,437
- Exercise price
- $14.00
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- -32,501
- Change %
- -100%
- Price
- $0.000000
- Shares after
- 0
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Nonvoting Common Stock
- Underlying amount
- 32,501
- Exercise price
- $16.14
- Footnotes
- F3, F4
MIAX
transaction
Derivative
Stock Option (Right to Buy)
Options Exercise
- Transaction value
- $0
- Shares
- +32,501
- Change %
- Price
- $0.000000
- Shares after
- 32,501
- Date
- 15 Aug 2025
- Ownership
- Direct
- Underlying class
- Common Stock
- Underlying amount
- 32,501
- Exercise price
- $16.14
- 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
Includes 36,250 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
Includes 45,058 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.