MIAMI INTERNATIONAL (MIAX) Director Jill Sommers Receives RSU Awards

What Happened

• Jill E. Sommers, a director of Miami International Holdings, Inc. (MIAX), was granted a total of 8,654 restricted stock units (RSUs) in two filings on June 15–16, 2026. The awards are reported at $0.00 per share (aggregate dollar value $0 on the Form 4 because these are RSU grants, not open‑market purchases). Breakdown: 1,113 RSUs granted/vested on 2026-06-15; 4,970 RSUs granted on 2026-06-16 that vest later; and 2,571 RSUs reported as a derivative award on 2026-06-16 with a staged vesting schedule.

Key Details

• Transaction dates and reported prices:
  • 2026-06-15: 1,113 RSUs @ $0.00 (F1) — fully vested on grant date.
  • 2026-06-16: 4,970 RSUs @ $0.00 (F2) — vest on the last business day immediately preceding the 2027 annual meeting, contingent on continued service.
  • 2026-06-16: 2,571 RSUs (derivative) @ $0.00 (F3) — vest in three tranches: 1,285 on 2026-06-30; 643 on 2026-09-30; 643 on 2026-12-31, subject to continued service.
• Shares owned after the transaction: Not specified in this Form 4.
• Filing timeliness: Form 4 filed 2026-06-17 for transactions on 2026-06-15 and 06-16 — filed within the typical two‑business‑day window (timely).
• Footnotes explained: F1 = RSUs that fully vested at grant; F2 = RSUs that vest before 2027 annual meeting if still employed/serving; F3 = schedule for the 2,571 tranche vesting.

Context

• These entries are awards (compensation) rather than open‑market purchases or sales; they reflect granted/vesting equity and do not by themselves signal a buy or sell decision by the insider. Derivative/RSU grants convert to shares only upon vesting and continued service, per the schedules above.