MIAX · Quarterly Report (Form 10-Q) · Filed November 7, 2025

Miami International Holdings Inc — 10-Q exhibit

exhibit32210-q.htm

Miami International Holdings Inc on Boardroom Alpha

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Exhibit 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER PURSUANT

TO 18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report on Form 10-Q of Miami International Holdings Inc. (the “Company”), for the period ended September 30, 2025, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Lance Emmons, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. §1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that to the best of my knowledge:

1.The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

2.The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 7, 2025

By: /s/ Lance Emmons

Chief Financial Officer

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