Director Lee Becker not standing for reelection; Jill E. Sommers appointed to board

MIAMI INTERNATIONAL HOLDINGS, INC.

Lee Becker will not stand for reelection at the 2026 Annual Meeting; no disagreement with company.
Jill E. Sommers elected to fill a vacancy effective March 25, 2026, term expires at Annual Meeting.
Ms. Sommers to receive same compensation as other non-employee directors; not on any committees.
No family relationships or transactions with company; standard indemnification agreement executed.

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