Form 4 for MIAX MIAMI INTERNATIONAL HOLDINGS, INC.
Accepted 2026-03-04 00:00:00 ET · period of report 2026-03-02 · accession 0001437749-26-006880 · SEC index · Original document
Summary rows
Aggregated the way they appear in lists: one row per insider, transaction code and security table.
| X | Filed | Traded | Ticker | Insider | Title | Type | Price | Qty | Owned | ΔOwn | Value |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DMI | 2026-03-04 | 2026-03-02 | MIAX | HORIZON KINETICS ASSET MANAGEMENT LLC | — | X - OptEx | $19.76 | +250.2K | 4.67M | +6% | +$4.94M |
| DI | 2026-03-04 | 2026-03-02 | MIAX | HORIZON KINETICS ASSET MANAGEMENT LLC | — | S - Sale+OE | $40.92 | -121.1K | 4.69M | -3% | -$4.95M |
| DMI | 2026-03-04 | 2026-03-02 | MIAX | HORIZON KINETICS ASSET MANAGEMENT LLC | — | X - OptEx | $0.00 | -250.2K | 0 | -100% | $0 |
Purchase Sale Sale after option exercise All abbreviations
Every reported transaction
| # | Table | Security | Date | Code | A/D | Shares | Price | Owned after | Own | Exercise / expiry | Underlying | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Common | Common Stock | 2026-03-02 | X | A | 137,500 | $20.00 | 4,810,520 | I Horizon Kinetics Asset Management LLC | — | — | |
| 2 | Common | Common Stock | 2026-03-02 | X | A | 21,290 | $15.00 | 4,581,654 | I Horizon Kinetics Asset Management LLC | — | — | |
| 3 | Common | Common Stock | 2026-03-02 | X | A | 91,366 | $20.50 | 4,673,020 | I Horizon Kinetics Asset Management LLC | — | — | |
| 4 | Common | Common Stock | 2026-03-02 | S | D | 121,054 | $40.92 | 4,689,466 | I Horizon Kinetics Asset Management LLC | — | — | |
| 5 | Derivative | Warrant (right to buy) | 2026-03-02 | X | D | 27,561 | $0.00 | 0 | I Horizon Kinetics Asset Management LLC | $20.50 · 2025-08-13 to 2027-02-05 | 27,561 Common Stock | |
| 6 | Derivative | Warrant (right to buy) | 2026-03-02 | X | D | 38,927 | $0.00 | 0 | I Horizon Kinetics Asset Management LLC | $20.50 · 2025-08-13 to 2026-10-17 | 38,927 Common Stock | |
| 7 | Derivative | Warrant (right to buy) | 2026-03-02 | X | D | 137,500 | $0.00 | 0 | I Horizon Kinetics Asset Management LLC | $20.00 · 2025-08-13 to 2027-08-09 | 137,500 Common Stock | |
| 8 | Derivative | Warrant (right to buy) | 2026-03-02 | X | D | 21,290 | $0.00 | 0 | I Horizon Kinetics Asset Management LLC | $15.00 · 2025-08-13 to 2026-04-08 | 21,290 Common Stock | |
| 9 | Derivative | Warrant (right to buy) | 2026-03-02 | X | D | 24,878 | $0.00 | 0 | I Horizon Kinetics Asset Management LLC | $20.50 · 2025-08-13 to 2026-11-15 | 24,878 Common Stock |