Senior insider sale
Chairman & CEO at MIAMI INTERNATIONAL HOLDINGS, INC. — senior position signals high conviction
$20.02M
479.03K shares
What this filing means
GALLAGHER THOMAS P. plans to sell 479.03K shares of MIAMI INTERNATIONAL HOLDINGS, INC. valued at approximately $20.02M. Form 144 is a notice of intent to sell restricted or control securities — not a mandatory transaction. This filing provides advance warning of potential selling pressure.
Filed: 9/3/2026ACC: 0001950047-26-009092
DirectorOfficer· Chairman & CEO
Since Feb 2026
479.03K
Shares to sell
$20.02M
Approx. market value
141K
Acquired (3 months)
1
Planned
5 completed
Securities Acquired — Last 3 Months1
Exercise of Stock Options
Cash
9/3/2026
141KTotal acquired141K
| Acquisition Date | Type | Amount Acquired | Gift |
|---|---|---|---|
9/3/2026 | Exercise of Stock Options Cash | 141K | — |
| Total | 141K | ||
Planned & Completed Dispositions6
Completed
—Completed
Units to sell
149.70K
Market value
$6.16M
8/19/2026
—Completed
Units to sell
48.33K
Market value
$2.21M
8/4/2026
—Completed
Units to sell
70K
Market value
$2.98M
7/13/2026
—Completed
Units to sell
28.23K
Market value
$1.19M
7/7/2026
—Completed
Units to sell
41.77K
Market value
$1.76M
7/6/2026
Planned — Approximate Date
NYSEPlanned
Units to sell
141K
Market value
$5.73M
9/3/2026
Total
Units
479.03K
Value
$20.02M
| Date | Units to Sell | Approx. Market Value | Exchange | Status |
|---|---|---|---|---|
| Completed | ||||
8/19/2026 | 149.70K | $6.16M | — | Completed |
8/4/2026 | 48.33K | $2.21M | — | Completed |
7/13/2026 | 70K | $2.98M | — | Completed |
7/7/2026 | 28.23K | $1.19M | — | Completed |
7/6/2026 | 41.77K | $1.76M | — | Completed |
| Planned — Approximate Date | ||||
9/3/2026 | 141K | $5.73M | NYSE | Planned |
| Total | 479.03K | $20.02M | ||