MIAX · Miami International Holdings, Inc.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 12, 2026.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 12, 2026.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 12, 2026.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

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

This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $43.49. 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.

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

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

The options are fully vested.

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

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

This transaction was executed in multiple trades throughout the day at prices ranging from $41.40 to $43.52. 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.

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

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

Represents shares that have been surrendered to the Company to satisfy tax withholding and remittance obligations in connection with the net settlement of restricted stock units and does not represent a sale by the Reporting Person.

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

This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.50. 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.

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

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

The options are fully vested.

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

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

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

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 30, 2025.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 30, 2025.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 22, 2025.

The options are fully vested.

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

This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.32. 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.

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

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026.

This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.32. 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.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 22, 2025.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 9, 2026.

The options are fully vested.

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

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

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 22, 2025.

This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.32. 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.

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

The options are fully vested.

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

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 30, 2025.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 30, 2025.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 30, 2025.

This transaction was executed in multiple trades throughout the day at prices ranging from $42.00 to $42.17. 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.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 16, 2025.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 16, 2025.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 16, 2025.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

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

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 16, 2025.

This transaction was executed in multiple trades throughout the day at prices ranging from $39.79 to $41.79. 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.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

The options are fully vested

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 16, 2025.

The options are fully vested.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

This transaction was executed in multiple trades throughout the day at prices ranging from $39.79 to $41.79. 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.

This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on December 18, 2025.

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.

The amount represents restricted stock units ("RSUs") that vest as to 7,766 on June 16, 2027, 7,766 on June 16, 2028 and the remaining 7,766 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through each applicable vesting date.

The amount represents restricted stock units ("RSUs") that vest as to 13,048 shares on June 16, 2027, 13,046 on June 16, 2028 and the remaining 13,046 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.

The amount represents restricted stock units ("RSUs") that vest as to 1,554 on June 16, 2027, 1,553 on June 16, 2028 and the remaining 1,553 on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through each applicable vesting date.

3,856 of the shares subject to this option will vest on June 30, 2026, 1,929 of the shares subject to this option will vest on September 30, 2026 and the remaining 1,928 of the shares subject to this option will vest on December 31, 2026, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.

2,367 of the shares subject to this option will vest on June 16, 2027, 2,367 of the shares subject to this option will vest on June 16, 2028 and the remaining 2,367 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.

1,728 of the shares subject to this option will vest on June 16, 2027, 1,728 of the shares subject to this option will vest on June 16, 2028 and the remaining 1,728 of the shares subject to this option will vest on June 16, 2029, subject to the Reporting Person's continued service to the Issuer or its subsidiaries through the applicable vesting date.