Form 4: Miami International Holdings CEO Sells Shares
Insider Transaction (Form 4)
Thomas P. Gallagher, Chairman & CEO and a Director of Miami International Holdings, Inc., sold 47,000 shares of common stock on September 3, 2026 for $42.43 per share.
Summary
- Option exercise/conversion: acquired 47,000 Common Stock at $12.00 ($564,000) on September 3, 2026; holds 1,470,275 after (Indirect).
- Open-market sale: disposed of 47,000 Common Stock at $42.43 ($1,994,210) on September 3, 2026; holds 1,423,275 after (Indirect).
- Option exercise/conversion: acquired 16,666 Common Stock at $12.00 ($199,992) on September 3, 2026; holds 760,605 after (Direct).
- Option exercise/conversion: acquired 8,333 Common Stock at $12.00 ($99,996) on September 3, 2026; holds 768,938 after (Direct).
- Option exercise/conversion: acquired 13,140 Common Stock at $15.22 ($199,991) on September 3, 2026; holds 782,078 after (Direct).
- Option exercise/conversion: acquired 4,464 Common Stock at $22.40 ($99,994) on September 3, 2026; holds 786,542 after (Direct).
- Option exercise/conversion: disposed of 47,000 Nonqualified Stock Option (Right to Buy) on September 3, 2026; holds 188,000 after (Indirect).
- Option exercise/conversion: disposed of 16,666 Incentive Stock Option (Right to Buy) on September 3, 2026 (Direct).
- Option exercise/conversion: disposed of 8,333 Incentive Stock Option (Right to Buy) on September 3, 2026 (Direct).
- Option exercise/conversion: disposed of 13,140 Incentive Stock Option (Right to Buy) on September 3, 2026 (Direct).
- Option exercise/conversion: disposed of 4,464 Incentive Stock Option (Right to Buy) on September 3, 2026; holds 8,928 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $1,994,210 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Thomas P. Gallagher — Director, Officer (Chairman & CEO)
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-03 | Option exercise/conversion | Common Stock | 47,000 | $12 | $564.0K | 1,470,275 |
| 2026-09-03 | Open-market sale | Common Stock | 47,000 | $42 | $2.0M | 1,423,275 |
| 2026-09-03 | Option exercise/conversion | Common Stock | 16,666 | $12 | $200.0K | 760,605 |
| 2026-09-03 | Option exercise/conversion | Common Stock | 8,333 | $12 | $100.0K | 768,938 |
| 2026-09-03 | Option exercise/conversion | Common Stock | 13,140 | $15 | $200.0K | 782,078 |
| 2026-09-03 | Option exercise/conversion | Common Stock | 4,464 | $22 | $100.0K | 786,542 |
| 2026-09-03 | Option exercise/conversion | Nonqualified Stock Option (Right to Buy) | 47,000 | — | — | 188,000 |
| 2026-09-03 | Option exercise/conversion | Incentive Stock Option (Right to Buy) | 16,666 | — | — | 0 |
| 2026-09-03 | Option exercise/conversion | Incentive Stock Option (Right to Buy) | 8,333 | — | — | 0 |
| 2026-09-03 | Option exercise/conversion | Incentive Stock Option (Right to Buy) | 13,140 | — | — | 0 |
| 2026-09-03 | Option exercise/conversion | Incentive Stock Option (Right to Buy) | 4,464 | — | — | 8,928 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-03 | Option exercise/conversion (47,000 shares) |
| 2026-09-03 | Open-market sale (47,000 shares) |
| 2026-09-03 | Option exercise/conversion (16,666 shares) |
| 2026-09-03 | Option exercise/conversion (8,333 shares) |
| 2026-09-03 | Option exercise/conversion (13,140 shares) |
| 2026-09-03 | Option exercise/conversion (4,464 shares) |
| 2026-09-03 | Option exercise/conversion (47,000 shares) |
| 2026-09-03 | Option exercise/conversion (16,666 shares) |
| 2026-09-03 | Option exercise/conversion (8,333 shares) |
| 2026-09-03 | Option exercise/conversion (13,140 shares) |
| 2026-09-03 | Option exercise/conversion (4,464 shares) |
Keywords
insider transaction, Form 4, MIAX, MIAMI INTERNATIONAL HOLDINGS, INC., bearish, Thomas P. Gallagher
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