Form 4 for MIAX MIAMI INTERNATIONAL HOLDINGS, INC.
Accepted 2026-08-19 16:12:08 ET · period of report 2026-08-17 · accession 0001628280-26-057950 · 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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DT | 2026-08-19 16:12 | 2026-08-17 | MIAX | Schwarzkopf Cynthia | Dir | M - OptEx | $12.00 | +5,000 | 93.5K | +6% | +$60.0K |
| DT | 2026-08-19 16:12 | 2026-08-17 | MIAX | Schwarzkopf Cynthia | Dir | S - Sale+OE | $42.85 | -5,000 | 88.5K | -5% | -$214.2K |
| DT | 2026-08-19 16:12 | 2026-08-17 | MIAX | Schwarzkopf Cynthia | Dir | M - OptEx | $0.00 | -5,000 | 11.9K | -30% | $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 | 2026-08-17 | M | A | 5,000 | $12.00 | 93,545 | D | — | — | (F1) This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 12, 2026. |
| 2 | Common | Common Stock | 2026-08-17 | S | D | 5,000 | $42.85 | 88,545 | D | — | — | (F1) This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 12, 2026. (F2) This transaction was executed in multiple trades throughout the day at prices ranging from $42.54 to $43.33. The price reported above reflects the weighted average sales price. The Reporting Person hereby undertakes to provide upon request to the Securities and Exchange Commission staff, the Issuer or a security holder of the Issuer, full information regarding the number of shares and prices at which the transaction was effected. |
| 3 | Derivative | Stock Option (Right to Buy) | 2026-08-17 | M | D | 5,000 | $0.00 | 11,916 | D | $12.00 · — to 2027-05-31 | 5,000 Common Stock | (F1) This transaction was effected pursuant to a previously established Rule 10b5-1 Plan adopted by the Reporting Person on March 12, 2026. (F3) The options are fully vested. |