26 insiders reported 283 Form 4 transactions for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) over the past 18 months (most recent 2026-09-17). Recent activity: Brown Shelly (EVP, Chief Strategy Officer) Sell 21,217 shares, Brown Shelly (EVP, Chief Strategy Officer) Sell 16,283 shares, Schafer Douglas M. JR (EVP and CIO) Sell 48,000 shares, Schafer Douglas M. JR (EVP and CIO) Buy 43,334 shares, Gallagher Thomas P. (Chairman & CEO) Buy 47,000 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-09-17 | Brown Shelly | EVP, Chief Strategy Officer | Sell | 21,217 | $819,188 |
| 2026-09-11 | Brown Shelly | EVP, Chief Strategy Officer | Sell | 16,283 | $692,679 |
| 2026-09-04 | Schafer Douglas M. JR | EVP and CIO | Sell | 48,000 | $1.9M |
| 2026-09-04 | Schafer Douglas M. JR | EVP and CIO | Buy | 43,334 | $520,008 |
| 2026-09-04 | Gallagher Thomas P. | Chairman & CEO | Buy | 47,000 | $564,000 |
| 2026-09-04 | Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | Buy | 11,000 | $132,000 |
| 2026-09-04 | Comly Barbara J. | EVP, GC & Corporate Secretary | Buy | 44,445 | $533,340 |
| 2026-09-04 | Teekell Judson Gray | Director | Sell | 3,000 | $122,670 |
| 2026-09-04 | Schafer Douglas M. JR | EVP and CIO | Buy | 4,666 | $55,992 |
| 2026-09-04 | Gallagher Thomas P. | Chairman & CEO | Sell | 47,000 | $2.0M |
| 2026-09-04 | Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | Sell | 11,000 | $464,310 |
| 2026-09-04 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell | 44,445 | $1.8M |
| 2026-09-04 | Teekell Judson Gray | Director | Sell | 5,545 | $230,561 |
| 2026-09-04 | Gallagher Thomas P. | Chairman & CEO | Buy | 16,666 | $199,992 |
| 2026-09-04 | Gallagher Thomas P. | Chairman & CEO | Buy | 8,333 | $99,996 |
| 2026-09-04 | Gallagher Thomas P. | Chairman & CEO | Buy | 13,140 | $199,991 |
| 2026-09-04 | Gallagher Thomas P. | Chairman & CEO | Buy | 4,464 | $99,994 |
| 2026-08-20 | Comly Barbara J. | EVP, GC & Corporate Secretary | Sell | 43,420 | $1.8M |
| 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 |
| 2026-08-19 | 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 | Teekell Judson Gray | Director | Sell | 3,000 | $137,370 |
Source: SEC Form 4 filings · as of 2026-09-17