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MIAMI INTERNATIONAL HOLDINGS, INC.

MIAX · CIK 0001438472

SEC FORM 4
$819,188.37

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 21,217 shares at $38.61 per share.

Reporting Person Brown Shelly · Officer Title EVP, Chief Strategy Officer · Transaction Code S

Traded Sep 16, 2026 · Disclosed Sep 17, 2026

Source: SEC Form 4 · 0002080506-26-000027 · filed 2026-09-17 · View filing →

SEC FORM 4
$692,678.82

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Disposition (code F) of 16,283 shares at $42.54 per share.

Reporting Person Brown Shelly · Officer Title EVP, Chief Strategy Officer · Transaction Code F

Traded Sep 11, 2026 · Disclosed Sep 11, 2026

Source: SEC Form 4 · 0002080506-26-000025 · filed 2026-09-11 · View filing →

SEC FORM 4
$564,000.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 47,000 shares at $12 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code M

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080477-26-000018 · filed 2026-09-04 · View filing →

SEC FORM 4
$1,994,210.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 47,000 shares at $42.43 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code S

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080477-26-000018 · filed 2026-09-04 · View filing →

SEC FORM 4
$199,992.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 16,666 shares at $12 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code M

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080477-26-000018 · filed 2026-09-04 · View filing →

SEC FORM 4
$99,996.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 8,333 shares at $12 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code M

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080477-26-000018 · filed 2026-09-04 · View filing →

SEC FORM 4
$199,990.80

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 13,140 shares at $15.22 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code M

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080477-26-000018 · filed 2026-09-04 · View filing →

SEC FORM 4
$99,993.60

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 4,464 shares at $22.40 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code M

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080477-26-000018 · filed 2026-09-04 · View filing →

SEC FORM 4
$132,000.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 11,000 shares at $12 per share.

Reporting Person Deitzel Edward · Officer Title EVP, CRO, CCO MIAX Exchanges · Transaction Code M

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080671-26-000016 · filed 2026-09-04 · View filing →

SEC FORM 4
$464,310.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 11,000 shares at $42.21 per share.

Reporting Person Deitzel Edward · Officer Title EVP, CRO, CCO MIAX Exchanges · Transaction Code S

Traded Sep 3, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080671-26-000016 · filed 2026-09-04 · View filing →

SEC FORM 4
$230,561.10

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 5,545 shares at $41.58 per share.

Reporting Person Teekell Judson Gray · Transaction Code S

Traded Sep 2, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0001959770-26-000012 · filed 2026-09-04 · View filing →

SEC FORM 4
$122,670.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 3,000 shares at $40.89 per share.

Reporting Person Teekell Judson Gray · Transaction Code S

Traded Sep 2, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0001959770-26-000012 · filed 2026-09-04 · View filing →

SEC FORM 4
$520,008.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 43,334 shares at $12 per share.

Reporting Person Schafer Douglas M. JR · Officer Title EVP and CIO · Transaction Code M

Traded Sep 2, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002079445-26-000017 · filed 2026-09-04 · View filing →

SEC FORM 4
$55,992.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 4,666 shares at $12 per share.

Reporting Person Schafer Douglas M. JR · Officer Title EVP and CIO · Transaction Code M

Traded Sep 2, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002079445-26-000017 · filed 2026-09-04 · View filing →

SEC FORM 4
$1,943,040.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 48,000 shares at $40.48 per share.

Reporting Person Schafer Douglas M. JR · Officer Title EVP and CIO · Transaction Code S

Traded Sep 2, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002079445-26-000017 · filed 2026-09-04 · View filing →

SEC FORM 4
$533,340.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 44,445 shares at $12 per share.

Reporting Person Comly Barbara J. · Officer Title EVP, GC & Corporate Secretary · Transaction Code M

Traded Sep 2, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080878-26-000016 · filed 2026-09-04 · View filing →

SEC FORM 4
$1,799,578.05

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 44,445 shares at $40.49 per share.

Reporting Person Comly Barbara J. · Officer Title EVP, GC & Corporate Secretary · Transaction Code S

Traded Sep 2, 2026 · Disclosed Sep 4, 2026

Source: SEC Form 4 · 0002080878-26-000016 · filed 2026-09-04 · View filing →

SEC FORM 4
$6,157,161.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 149,700 shares at $41.13 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code S

Traded Aug 19, 2026 · Disclosed Aug 20, 2026

Source: SEC Form 4 · 0002080477-26-000016 · filed 2026-08-20 · View filing →

SEC FORM 4
$6,374,223.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Disposition (code F) of 150,300 shares at $42.41 per share.

Reporting Person Gallagher Thomas P. · Officer Title Chairman & CEO · Transaction Code F

Traded Aug 18, 2026 · Disclosed Aug 20, 2026

Source: SEC Form 4 · 0002080477-26-000016 · filed 2026-08-20 · View filing →

SEC FORM 4
$1,841,442.20

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Disposition (code F) of 43,420 shares at $42.41 per share.

Reporting Person Comly Barbara J. · Officer Title EVP, GC & Corporate Secretary · Transaction Code F

Traded Aug 18, 2026 · Disclosed Aug 20, 2026

Source: SEC Form 4 · 0002080878-26-000014 · filed 2026-08-20 · View filing →

SEC FORM 4
$1,499,050.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 35,000 shares at $42.83 per share.

Reporting Person Emmons Lance · Officer Title EVP and CFO · Transaction Code S

Traded Aug 17, 2026 · Disclosed Aug 19, 2026

Source: SEC Form 4 · 0001628280-26-057946 · filed 2026-08-19 · View filing →

SEC FORM 4
$60,000.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Acquisition (code M) of 5,000 shares at $12 per share.

Reporting Person Schwarzkopf Cynthia · Transaction Code M

Traded Aug 17, 2026 · Disclosed Aug 19, 2026

Source: SEC Form 4 · 0001628280-26-057950 · filed 2026-08-19 · View filing →

SEC FORM 4
$214,250.00

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Sale of 5,000 shares at $42.85 per share.

Reporting Person Schwarzkopf Cynthia · Transaction Code S

Traded Aug 17, 2026 · Disclosed Aug 19, 2026

Source: SEC Form 4 · 0001628280-26-057950 · filed 2026-08-19 · View filing →