Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| MIAMI INTERNATIONAL HOLDINGS, INC.MIAX · Entity 4026 | Director · Chairman & CEO | September 03, 2026 | September 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 / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Common StockSEC Table I · non-derivative | IndirectBy Gallagher Investments, LLC | 1,423,275 |
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 rowsRow 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-derivative | Direct | 786,542 |
Ending reported balance
After 2026-09-03 transaction · row 6
4 source rows · reconciled sequenceRow 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 2028-05-28 | IndirectBy Gallagher Investments, LLC | 188,000 |
Reported balance
After 2026-09-03 transaction · row 7
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 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 2028-05-28 | Direct | 0 |
Reported balance
After 2026-09-03 transaction · row 8
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 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 2029-07-30 | Direct | 0 |
Reported balance
After 2026-09-03 transaction · row 9
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 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 2031-01-27 | Direct | 0 |
Reported balance
After 2026-09-03 transaction · row 10
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 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 2035-06-15 | Direct | 8,928 |
Reported balance
After 2026-09-03 transaction · row 11
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 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
JSON APIPurchases/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 date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 Read SEC document |
| 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 |
DisclosureSEC 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. Read SEC document |
| 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 |
DisclosureSEC 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 |
DisclosureSEC 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 |
DisclosureSEC 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 Read SEC document |
| August 15, 2025 Filed Aug 19, 2025 20:06 UTC | MIAMI INTERNATIONAL HOLDINGS, INC. MIAX · Entity 4026 | ConversionCommon Stock | 500 | Not disclosed | Not disclosed |
DisclosureSEC 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 Read SEC document |
| 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 |
DisclosureSEC 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 Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.