BROWN DAVID A 4

4 · MIAMI INTERNATIONAL HOLDINGS, INC. · Filed Jun 17, 2026

AI-generated summary of this filing

Updated Jun 17, 2026

MIAMI INTERNATIONAL (MIAX) Director David A. Brown Receives RSU Awards

What Happened

David A. Brown, a director of Miami International Holdings, Inc. (MIAX), was granted/received a total of 12,379 shares/awards in mid‑June 2026. The filings show acquisitions at $0.00 (awards, not open‑market purchases): 2,267 RSUs that vested immediately, 4,970 RSUs that vest before the 2027 annual meeting, and 5,142 derivative shares (option‑style award) with time‑based vesting.

Key Details

Transaction dates and prices:
- 2026-06-15: 2,267 RSUs acquired at $0.00 (vested on grant) — Footnote F1.
- 2026-06-16: 4,970 RSUs acquired at $0.00 (vest on last business day before 2027 annual meeting, subject to continued service) — Footnote F2.
- 2026-06-16: 5,142 derivative shares acquired at $0.00 (option/award with staged vesting) — Footnote F3.
Vesting schedule for the 5,142 derivative shares (F3): 2,571 on 2026-06-30; 1,285 on 2026-09-30; 1,286 on 2026-12-31, subject to continued service.
Total shares involved: 12,379. Reported acquisition value: $0 (awarded equity, not a cash purchase).
Shares owned after the transaction: not disclosed in the provided filing.
Filing: Form 4 filed 2026-06-17 for transactions dated 2026-06-15 and 06-16 — appears timely (no late filing indicated).

Context

These were equity awards and a time‑vested derivative grant, not open‑market purchases or sales. Because some RSUs vested immediately and others vest over time, the awards represent compensation/retention arrangements rather than a direct market signal from an outright purchase or sale. The derivative award will vest in installments if Brown remains in service through the vesting dates.

Form 4

Period: 2026-06-15

Director

Transactions

Award
Common Stock
[F1]
2026-06-15+2,267→ 2,267 total
Award
Common Stock
[F2]
2026-06-16+4,970→ 7,237 total
Award
Nonqualified Stock Option (Right to Buy)
[F3]
2026-06-16+5,142→ 5,142 total
Exercise: $40.24Exp: 2036-06-15→ Common Stock (5,142 underlying)

Footnotes (3)

[F1]The amount represents restricted stock units ("RSUs") that fully vested on the date of grant. Each RSU represents a right to receive one share of the Issuer's common stock.
[F2]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.
[F3]2,571 of the shares subject to this option will vest on June 30, 2026, 1,285 of the shares subject to this option will vest on September 30, 2026 and the remaining 1,286 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.

Signature

/s/Alessandra Maria Corona Henriques, Attorney-in-Fact|2026-06-17

1 file