Gallagher Thomas P., Chairman and CEO of Miami International Holdings, Inc. ($MIAX), made one open market purchase of company shares in the last 365 days, totaling $276,000. His most recent buy occurred on August 13, 2025. This purchase amount ranks 1,226th among nearly 5,000 individual insiders, below the average of $1.46 million across 3.3 transactions. Gallagher reported no open market sales during this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| May 11, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 24999 | $0.00 | 0.0000 | 81,435,030 | 100.00% | 0.03% |
| May 11, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Common Stock | 24999 | $12.00 | 510,962.0000 | 81,435,030 | 5.14% | 0.03% |
| May 5, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 15771 | $0.00 | 210,000.0000 | 81,435,030 | 6.99% | 0.02% |
| May 5, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Common Stock | 15771 | $12.00 | 1,739,046.0000 | 81,435,030 | 0.92% | 0.02% |
| May 5, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | S | Common Stock | 15771 | $47.92 | 1,723,275.0000 | 81,435,030 | 0.91% | 0.02% |
| May 4, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Common Stock | 54229 | $12.00 | 1,777,504.0000 | 81,435,030 | 3.15% | 0.07% |
| May 4, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | S | Common Stock | 54229 | $47.26 | 1,723,275.0000 | 81,435,030 | 3.05% | 0.07% |
| May 4, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 54229 | $0.00 | 225,771.0000 | 81,435,030 | 19.37% | 0.07% |
| April 15, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | S | Common Stock | 49900 | $43.68 | 2,209,238.0000 | 81,435,030 | 2.21% | 0.06% |
| April 15, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 70001 | $0.00 | 280,000.0000 | 81,435,030 | 20.00% | 0.09% |
| April 15, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Common Stock | 70001 | $12.00 | 2,383,363.0000 | 81,435,030 | 3.03% | 0.09% |
| April 15, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | S | Common Stock | 70001 | $43.36 | 2,313,362.0000 | 81,435,030 | 2.94% | 0.09% |
| April 15, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | S | Common Stock | 104124 | $43.36 | 2,209,238.0000 | 81,435,030 | 4.50% | 0.13% |
| March 30, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | F | Common Stock | 20875 | $37.50 | 1,827,399.0000 | 81,435,030 | 1.13% | 0.03% |
| Feb. 10, 2026 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | F | Common Stock | 50100 | $41.33 | 535,863.0000 | 81,435,030 | 8.55% | 0.06% |
| Dec. 23, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | G | Common Stock | 2000 | $0.00 | 585,963.0000 | 81,435,030 | 0.34% | 0.00% |
| Aug. 26, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | F | Common Stock | 192220 | $33.90 | 2,436,237.0000 | 0 | 7.31% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 283334 | $0.00 | 283,334.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 241667 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 241667 | $0.00 | 241,667.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 286860 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | C | Common Stock | 500 | $0.00 | 2,626,457.0000 | 0 | 0.02% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 375000 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 375000 | $0.00 | 375,000.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 286860 | $0.00 | 286,860.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | C | Common Stock | 573963 | $0.00 | 2,626,457.0000 | 0 | 27.96% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | C | Common Stock | 135395 | $0.00 | 2,626,457.0000 | 0 | 5.44% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | C | Series B Preferred Stock | 500 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | C | Nonvoting Common Stock | 573963 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | C | Nonvoting Common Stock | 135395 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 24999 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 24999 | $0.00 | 24,999.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 16666 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 16666 | $0.00 | 16,666.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 8333 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 8333 | $0.00 | 8,333.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 13140 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Incentive Stock Option (Right to Buy) | 13140 | $0.00 | 13,140.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 350001 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 350001 | $0.00 | 350,001.0000 | 0 | 9999.99% | 0.00% |
| Aug. 15, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | M | Nonqualified Stock Option (Right to Buy) | 283334 | $0.00 | 0.0000 | 0 | 100.00% | 0.00% |
| Aug. 13, 2025 | MIAMI INTERNATIONAL HOLDINGS, INC. | $MIAX | Gallagher Thomas P. | Chairman & CEO | P | Common Stock | 12000 | $23.00 | 12,000.0000 | 0 | 9999.99% | 0.00% |