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Gallagher Thomas P.

Disclosed activity across 1 company

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10131
SEC CIK
0002080477

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Reported relationships

Latest disclosed role at each company.

CompanyLast reported asReport datePublished
MIAMI INTERNATIONAL HOLDINGS, INC.MIAX · Entity 4026Director · Chairman & CEOSeptember 03, 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 03, 2026 · Filed September 04, 2026

Security / awardOwnership accountDisclosed shares / unitsDisclosure context
Common StockSEC Table I · non-derivativeIndirectBy Gallagher Investments, LLC1,423,275 Last balance in matching sequence After 2026-09-03 transaction · row 2 Source-order balances reconcile. Account continuity and personal attribution are not independently verified.
2 source rows

Row 1 · 2026-09-03 · Exercise / conversion · Acquired 47,000 · Balance 1,470,275

F1: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 29, 2025.

F2: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.

Row 2 · 2026-09-03 · Sale · Disposed 47,000 · Balance 1,423,275

F1: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 29, 2025.

F3: This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.68. 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.

F2: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.

Common StockSEC Table I · non-derivativeDirect786,542 Ending reported balance After 2026-09-03 transaction · row 6
4 source rows · reconciled sequence

Row 3 · 2026-09-03 · Exercise / conversion · Acquired 16,666 · Balance 760,605

Row 4 · 2026-09-03 · Exercise / conversion · Acquired 8,333 · Balance 768,938

Row 5 · 2026-09-03 · Exercise / conversion · Acquired 13,140 · Balance 782,078

Row 6 · 2026-09-03 · Exercise / conversion · Acquired 4,464 · Balance 786,542

Nonqualified Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $12.00 · Expires 2028-05-28IndirectBy Gallagher Investments, LLC188,000 Reported balance After 2026-09-03 transaction · row 7 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 7 · 2026-09-03 · Exercise / conversion · Disposed 47,000 · Balance 188,000

F1: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 29, 2025.

F4: The options are fully vested.

F2: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.

Incentive Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $12.00 · Expires 2028-05-28Direct0 Reported balance After 2026-09-03 transaction · row 8 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 8 · 2026-09-03 · Exercise / conversion · Disposed 16,666 · Balance 0

F4: The options are fully vested.

Incentive Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $12.00 · Expires 2029-07-30Direct0 Reported balance After 2026-09-03 transaction · row 9 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 9 · 2026-09-03 · Exercise / conversion · Disposed 8,333 · Balance 0

F4: The options are fully vested.

Incentive Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $15.22 · Expires 2031-01-27Direct0 Reported balance After 2026-09-03 transaction · row 10 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 10 · 2026-09-03 · Exercise / conversion · Disposed 13,140 · Balance 0

F4: The options are fully vested.

Incentive Stock Option (Right to Buy)SEC Table II · derivative / convertible security · Conversion / exercise price $22.40 · Expires 2035-06-15Direct8,928 Reported balance After 2026-09-03 transaction · row 11 Instrument identity requires review; Table II rows are not merged.
1 source row

Row 11 · 2026-09-03 · Exercise / conversion · Disposed 4,464 · Balance 8,928

F5: 4,464 of the shares subject to this incentive stock option are vested. 4,464 shares subject to this incentive stock option will vest on June 16, 2027 and the remaining 4,464 shares subject to this incentive stock option will vest on June 16, 2028, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.

Filing footnotes · ownership attribution and instrument terms

F1: This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 29, 2025.

F2: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC.

F3: This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.68. 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.

F4: The options are fully vested.

F5: 4,464 of the shares subject to this incentive stock option are vested. 4,464 shares subject to this incentive stock option will vest on June 16, 2027 and the remaining 4,464 shares subject to this incentive stock option will vest on June 16, 2028, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.

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
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 286,860 $0.00 Strike: $15.22 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 22

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 286,860

Underlying: Common Stock · 286,860 shares

Expires 2031-01-27

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 286,860 $0.00 Strike: $15.22 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 21

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 286,860 shares

Expires 2031-01-27

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 241,667 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 20

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 241,667

Underlying: Common Stock · 241,667 shares

Expires 2029-07-30

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 241,667 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 19

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 241,667 shares

Expires 2029-07-30

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 283,334 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 18

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 283,334

Underlying: Common Stock · 283,334 shares

Expires 2028-05-28

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 283,334 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 17

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 283,334 shares

Expires 2028-05-28

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 350,001 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 16

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 350,001

Underlying: Common Stock · 350,001 shares

Expires 2026-08-02

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionNonqualified Stock Option (Right to Buy) · Derivative 350,001 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 15

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 350,001 shares

Expires 2026-08-02

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 13,140 $0.00 Strike: $15.22 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 14

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 13,140

Underlying: Common Stock · 13,140 shares

Expires 2031-01-27

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 13,140 $0.00 Strike: $15.22 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 13

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 13,140 shares

Expires 2031-01-27

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 8,333 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 12

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,333

Underlying: Common Stock · 8,333 shares

Expires 2029-07-30

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 8,333 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 11

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 8,333 shares

Expires 2029-07-30

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 16,666 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 10

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,666

Underlying: Common Stock · 16,666 shares

Expires 2028-05-28

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 16,666 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 9

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 16,666 shares

Expires 2028-05-28

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 24,999 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 8

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,999

Underlying: Common Stock · 24,999 shares

Expires 2026-08-02

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 Exercise / conversionIncentive Stock Option (Right to Buy) · Derivative 24,999 $0.00 Strike: $12.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 7

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Nonvoting Common Stock · 24,999 shares

Expires 2026-08-02

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.

F6 · derivative.exercise_price: 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.

F6 · shares: 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.

F7 · derivative.exercise_date: The options are fully vested.

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionNonvoting Common Stock · Derivative 135,395 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 6

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 0

Underlying: Common Stock · 135,395 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.

F5 · derivative.exercise_price: Represents 135,395 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.

F5 · shares: Represents 135,395 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.

F5 · derivative.exercise_date: Represents 135,395 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.

F5 · derivative.expiration_date: Represents 135,395 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.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

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August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionNonvoting Common Stock · Derivative 573,963 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 5

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 573,963 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: Represents 573,963 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.

F3 · shares: Represents 573,963 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.

F3 · derivative.exercise_date: Represents 573,963 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.

F3 · derivative.expiration_date: Represents 573,963 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.

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August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionSeries B Preferred Stock · Derivative 500 $0.00 $0.00
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · derivative · entry 4

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 0

Underlying: Common Stock · 500 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: 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.

F1 · shares: 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionCommon Stock 135,395 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · nonDerivative · entry 3

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 2,040,494

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 · shares: Represents 135,395 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.

F5 · price: Represents 135,395 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.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

Read SEC document
August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionCommon Stock 573,963 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · nonDerivative · entry 2

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 585,963

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: Represents 573,963 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.

F3 · price: Represents 573,963 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.

F4 · balance_after: Includes 12,000 shares of common stock jointly with his spouse with right of survival

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August 15, 2025 Filed Aug 19, 2025 20:06 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 ConversionCommon Stock 500 Not disclosed Not disclosed
Disclosure

SEC source: 0001628280-25-040785 · wk-form4_1755633954.xml · nonDerivative · entry 1

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · By Gallagher Investments, LLC

Disclosed balance after: 2,040,494

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: 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.

F1 · price: 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.

F2 · ownership.nature: Mr. Gallagher maintains beneficial ownership, including dispositive and voting control, over Gallagher Investments, LLC

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August 13, 2025 Filed Aug 15, 2025 20:48 UTC MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 PurchaseCommon Stock 12,000 $23.00 $276,000.00
Disclosure

SEC source: 0001628280-25-040557 · wk-form4_1755290905.xml · nonDerivative · entry 1

Gallagher Thomas P. · CIK 0002080477 · Director · Chairman & CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 12,000

F1 · ownership.direct: 12,000 shares of common stock jointly with his spouse with right of survival

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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.