26 insiders reported 255 Form 4 transactions for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) over the past 18 months (most recent 2026-08-20). Recent activity: Gallagher Thomas P. (Chairman & CEO) Sell 149,700 shares, Gallagher Thomas P. (Chairman & CEO) Sell 150,300 shares, Comly Barbara J. (EVP, GC & Corporate Secretary) Sell 43,420 shares, Schwarzkopf Cynthia (Director) Buy 5,000 shares, Emmons Lance (EVP and CFO) Sell 35,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-20 | Gallagher Thomas P. | Chairman & CEO | Sell | 149,700 | $6.2M |
| 2026-08-20 | Gallagher Thomas P. | Chairman & CEO | Sell | 150,300 | $6.4M |
| 2026-08-20 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell | 43,420 | $1.8M |
| 2026-08-19 | Schwarzkopf Cynthia | Director | Buy | 5,000 | $60,000 |
| 2026-08-19 | Emmons Lance | EVP and CFO | Sell | 35,000 | $1.5M |
| 2026-08-19 | Schwarzkopf Cynthia | Director | Sell | 5,000 | $214,250 |
| 2026-08-06 | Schafer Douglas M. JR | EVP and CIO | Buy | 48,000 | $576,000 |
| 2026-08-06 | Gallagher Thomas P. | Chairman & CEO | Buy | 48,334 | $580,008 |
| 2026-08-06 | Jayabalan Harish | EVP, CISO and CRO | Buy | 14,168 | $170,016 |
| 2026-08-06 | Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | Buy | 11,000 | $132,000 |
| 2026-08-06 | Eckert Kurt M. | Director | Buy | 1,063 | $12,756 |
| 2026-08-06 | Comly Barbara J. | EVP, GC & Corporate Secretary | Buy | 44,445 | $533,340 |
| 2026-08-06 | Teekell Judson Gray | Director | Sell | 3,000 | $137,370 |
| 2026-08-06 | Schafer Douglas M. JR | EVP and CIO | Sell | 48,000 | $2.2M |
| 2026-08-06 | Gallagher Thomas P. | Chairman & CEO | Sell | 48,334 | $2.2M |
| 2026-08-06 | Jayabalan Harish | EVP, CISO and CRO | Buy | 5,832 | $88,763 |
| 2026-08-06 | Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | Sell | 11,000 | $503,580 |
| 2026-08-06 | Eckert Kurt M. | Director | Sell | 1,063 | $48,685 |
| 2026-08-06 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell | 44,445 | $2.0M |
| 2026-08-06 | Jayabalan Harish | EVP, CISO and CRO | Sell | 20,000 | $918,000 |
| 2026-07-16 | Schwarzkopf Cynthia | Director | Buy | 5,000 | $60,000 |
| 2026-07-16 | Schwarzkopf Cynthia | Director | Sell | 5,000 | $210,000 |
| 2026-07-14 | Comly Barbara J. | EVP, GC & Corporate Secretary | Buy | 28,000 | $336,000 |
| 2026-07-14 | Gallagher Thomas P. | Chairman & CEO | Buy | 70,000 | $840,000 |
| 2026-07-14 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell | 28,000 | $1.2M |
Source: SEC Form 4 filings · as of 2026-08-20