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person · Reporting owner

Teekell Judson Gray

Disclosed activity across 1 company

Tapewire entity
10086
SEC CIK
0001959770

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
MIAMI INTERNATIONAL HOLDINGS, INC.MIAX · Entity 4026DirectorSeptember 02, 2026September 04, 2026

Disclosed balances

About these balances

Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.

MIAMI INTERNATIONAL HOLDINGS, INC.

Report date September 02, 2026 · Filed September 04, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeIndirectBy estate of Byrum W. Teekell81,000 Reported balance After 2026-09-02 transaction · row 1 Account identity is unresolved; indirect or unspecified ownership is not merged.
1 source row

Row 1 · 2026-09-02 · Sale · Disposed 5,545 · Balance 81,000

F1: This transaction involved a sale by the Reporting Person in connection with his duties as Executor of the Estate of Byrum W. Teekell.

F2: This transaction was executed in multiple trades throughout the day at prices ranging from $41.02 to $41.80. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Common StockSEC Table I · non-derivativeDirect69,251 Reported balance After 2026-09-02 transaction · row 2
1 source row

Row 2 · 2026-09-02 · Sale · Disposed 3,000 · Balance 69,251

F3: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

F4: This transaction was executed in multiple trades throughout the day at prices ranging from $40.31 to $41.53. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Filing footnotes · ownership attribution and instrument terms

F1: This transaction involved a sale by the Reporting Person in connection with his duties as Executor of the Estate of Byrum W. Teekell.

F2: This transaction was executed in multiple trades throughout the day at prices ranging from $41.02 to $41.80. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

F3: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

F4: This transaction was executed in multiple trades throughout the day at prices ranging from $40.31 to $41.53. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Transaction history

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Purchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”

The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.

Transaction dateCompanyActivity / securityShares / unitsReported priceReported valueDetails
September 02, 2026 Filed Sep 4, 2026 20:21 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 3,000 $40.89 $122,670.00
Disclosure

SEC source: 0001959770-26-000012 · wk-form4_1788553296.xml · nonDerivative · entry 2

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,251

F3 · kind: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

F4 · price: This transaction was executed in multiple trades throughout the day at prices ranging from $40.31 to $41.53. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
September 02, 2026 Filed Sep 4, 2026 20:21 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 5,545 $41.58 $230,561.10
Disclosure

SEC source: 0001959770-26-000012 · wk-form4_1788553296.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: Plan reported

Ownership: Indirect · By estate of Byrum W. Teekell

Disclosed balance after: 81,000

F1 · kind: This transaction involved a sale by the Reporting Person in connection with his duties as Executor of the Estate of Byrum W. Teekell.

F2 · price: This transaction was executed in multiple trades throughout the day at prices ranging from $41.02 to $41.80. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
August 04, 2026 Filed Aug 6, 2026 20:10 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 3,000 $45.79 $137,370.00
Disclosure

SEC source: 0001959770-26-000010 · wk-form4_1786047054.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 72,251

F1 · kind: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

F2 · price: This transaction was executed in multiple trades throughout the day at prices ranging from $45.13 to $46.56. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
July 02, 2026 Filed Jul 7, 2026 20:09 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 3,000 $40.00 $120,000.00
Disclosure

SEC source: 0001628280-26-047489 · wk-form4_1783454974.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 75,251

F1 · kind: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

Read SEC document
June 16, 2026 Filed Jun 17, 2026 20:22 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 GrantCommon Stock 4,970 $0.00 $0.00
Disclosure

SEC source: 0001959770-26-000008 · wk-form4_1781727759.xml · nonDerivative · entry 2

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,251

F2 · shares: The amount represents RSUs that vest on the last business day immediately preceding the 2027 annual meeting of stockholders, subject to the Reporting Person's continued service to the Issuer through the vesting date.

Read SEC document
June 15, 2026 Filed Jun 17, 2026 20:22 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 GrantCommon Stock 2,267 $0.00 $0.00
Disclosure

SEC source: 0001959770-26-000008 · wk-form4_1781727759.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 73,281

F1 · shares: The amount represents restricted stock units ("RSUs") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock.

Read SEC document
June 02, 2026 Filed Jun 4, 2026 20:55 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 3,000 $42.78 $128,340.00
Disclosure

SEC source: 0001959770-26-000006 · wk-form4_1780606502.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 71,014

F1 · kind: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

F2 · price: This transaction was executed in multiple trades throughout the day at prices ranging from $41.53 to $43.99. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
May 19, 2026 Filed May 19, 2026 20:34 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 22,667 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001959770-26-000004 · wk-form4_1779222886.xml · derivative · entry 3

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 22,667 shares

Expires 2026-06-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: The options are fully vested.

Read SEC document
May 19, 2026 Filed May 19, 2026 20:34 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Tax withholdingCommon Stock 4,991 $54.51 $272,059.41
Disclosure

SEC source: 0001959770-26-000004 · wk-form4_1779222886.xml · nonDerivative · entry 2

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 74,014

F1 · shares: Represents shares that have been withheld by the Issuer to cover the exercise price of the options exercised and does not represent a sale by the Reporting Person.

Read SEC document
May 19, 2026 Filed May 19, 2026 20:34 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionCommon Stock 22,667 $12.00 $272,004.00
Disclosure

SEC source: 0001959770-26-000004 · wk-form4_1779222886.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 79,005

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

Read SEC document
May 04, 2026 Filed May 5, 2026 11:41 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 3,000 $47.30 $141,900.00
Disclosure

SEC source: 0001959770-26-000002 · wk-form4_1777981287.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 56,338

F1 · kind: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 17, 2025.

F2 · price: This transaction was executed in multiple trades throughout the day at prices ranging from $47.14 to $47.55. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
April 02, 2026 Filed Apr 3, 2026 12:48 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 2,700 $40.00 $108,000.00
Disclosure

SEC source: 0001628280-26-023478 · wk-form4_1775220520.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 59,338

F1 · kind: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the reporting person on December 17, 2025.

Read SEC document
March 25, 2026 Filed Mar 26, 2026 20:32 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 SaleCommon Stock 300 $40.00 $12,000.00
Disclosure

SEC source: 0001628280-26-021445 · wk-form4_1774557120.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,038

F1 · kind: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the reporting person on December 17, 2025.

F2 · price: This transaction was executed in multiple trades throughout the day at prices ranging from $40.00 to $40.00. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares and prices at which the transaction was effected.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 20,556 $0.00 Strike: $16.14 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 22

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,556

Underlying: Common Stock · 20,556 shares

Expires 2031-05-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 20,556 $0.00 Strike: $16.14 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 21

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 20,556 shares

Expires 2031-05-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 28,125 $0.00 Strike: $14.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 20

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 28,125

Underlying: Common Stock · 28,125 shares

Expires 2030-06-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 28,125 $0.00 Strike: $14.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 19

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 28,125 shares

Expires 2030-06-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 5,000 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 18

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,000

Underlying: Common Stock · 5,000 shares

Expires 2029-06-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 5,000 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 17

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 5,000 shares

Expires 2029-06-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 12,500 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 16

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,500

Underlying: Common Stock · 12,500 shares

Expires 2029-05-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 12,500 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 15

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 12,500 shares

Expires 2029-05-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 12,833 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 14

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,833

Underlying: Nonvoting Common Stock · 12,833 shares

Expires 2028-04-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 12,833 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 13

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 12,833 shares

Expires 2028-04-30

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 13,500 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 12

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,500

Underlying: Common Stock · 13,500 shares

Expires 2027-05-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F5 · derivative.exercise_date: 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.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 13,500 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 11

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 13,500 shares

Expires 2027-05-31

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

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August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 22,667 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 10

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,667

Underlying: Common Stock · 22,667 shares

Expires 2026-06-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

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August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionStock Option (Right to Buy) · Derivative 22,667 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 9

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 22,667 shares

Expires 2026-06-19

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_price: 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.

F5 · shares: 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.

F6 · derivative.exercise_date: The options are fully vested.

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August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionNonvoting Common Stock · Derivative 38,131 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 8

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By estate of Byrum W. Teekell

Disclosed balance after: 0

Underlying: Common Stock · 38,131 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_price: 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.

F4 · shares: 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.

F4 · derivative.exercise_date: 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.

F4 · derivative.expiration_date: 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.

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August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionSeries B Preferred Stock · Derivative 30,000 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 7

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By estate of Byrum W. Teekell

Disclosed balance after: 0

Underlying: Common Stock · 30,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_price: 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.

F3 · shares: 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.

F3 · derivative.exercise_date: 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.

F3 · derivative.expiration_date: 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.

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August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionNonvoting Common Stock · Derivative 31,242 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 6

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 31,242 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: 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.

F2 · shares: 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.

F2 · derivative.exercise_date: 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.

F2 · derivative.expiration_date: 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.

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August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionSeries B Preferred Stock · Derivative 30,000 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · derivative · entry 5

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 30,000 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: 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.

F1 · shares: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionCommon Stock 38,131 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · nonDerivative · entry 4

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By estate of Byrum W. Teekell

Disclosed balance after: 86,545

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · shares: 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.

F1 · price: 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.

F3 · balance_after: 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.

F4 · balance_after: 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.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionCommon Stock 30,000 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · nonDerivative · entry 3

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · By estate of Byrum W. Teekell

Disclosed balance after: 86,545

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · shares: 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.

F1 · price: 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.

F3 · balance_after: 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.

F4 · balance_after: 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.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionCommon Stock 31,242 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · nonDerivative · entry 2

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,338

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · shares: 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.

F1 · price: 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.

F1 · balance_after: 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.

F2 · balance_after: 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.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:05 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionCommon Stock 30,000 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-040784 · wk-form4_1755633936.xml · nonDerivative · entry 1

Teekell Judson Gray · CIK 0001959770 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 62,338

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · shares: 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.

F1 · price: 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.

F1 · balance_after: 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.

F2 · balance_after: 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.

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Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.