MIAX
MIAMI INTERNATIONAL HOLDINGS, INC.
Latest Form 4:Sale$6.2MbyGallagher Thomas P. (Chairman & CEO) · filed Aug 20, 2026
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) has 112 SEC Form 4 filings (203 transaction rows) in the rolling window, disclosed by 11 distinct insiders. Most recent filing: Aug 20, 2026.
The most active filer is Chairman & CEO Gallagher Thomas P. with 9 filings. Insiders have net sold $72.2M over the trailing 6 months.
- Industry:Financial - Capital Markets
- CEO:Thomas Gallagher
- Employees:433
- HQ:Princeton, NJ, US
- IPO:2025-08-14
Insider Buying
$2.0M
reported purchases (SEC code P)
Insider Selling
$72.8M
reported sales (SEC code S)
Unique Insiders
11
in the rolling window
Market Cap
$4.3B
latest known value
| Source | ||||||
|---|---|---|---|---|---|---|
| Chairman & CEO | Sale | 149,700 | $6.2M | Aug 20 | SEC ↗ | |
| Director | Sale | 5,000 | $214K | Aug 19 | SEC ↗ | |
Emmons LanceFirst in 3 months | EVP and CFO | Sale | 35,000 | $1.5M | Aug 19 | SEC ↗ |
| EVP and CIO | Sale | 48,000 | $2.2M | Aug 6 | SEC ↗ | |
| Chairman & CEO | Sale | 48,334 | $2.2M | Aug 6 | SEC ↗ | |
| EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $504K | Aug 6 | SEC ↗ | |
| EVP, GC & Corporate Secretary | Sale | 44,445 | $2.0M | Aug 6 | SEC ↗ | |
| Director | Sale | 1,063 | $49K | Aug 6 | SEC ↗ | |
| Director | Sale | 3,000 | $137K | Aug 6 | SEC ↗ | |
| EVP, CISO and CRO | Sale | 20,000 | $918K | Aug 6 | SEC ↗ | |
| Director | Sale | 5,000 | $210K | Jul 16 | SEC ↗ | |
| EVP, GC & Corporate Secretary | Sale | 28,000 | $1.2M | Jul 14 | SEC ↗ | |
| Chairman & CEO | Sale | 70,000 | $3.0M | Jul 14 | SEC ↗ | |
| EVP, CISO and CRO | Sale | 20,000 | $842K | Jul 7 | SEC ↗ | |
| Chairman & CEO | Sale | 41,772 | $1.8M | Jul 7 | SEC ↗ | |
| Chairman & CEO | Sale | 28,228 | $1.2M | Jul 7 | SEC ↗ | |
| EVP and CIO | Sale | 48,000 | $2.0M | Jul 7 | SEC ↗ | |
| EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $462K | Jul 7 | SEC ↗ | |
| EVP, Chief Strategy Officer | Sale | 16,000 | $674K | Jul 7 | SEC ↗ | |
| EVP, GC & Corporate Secretary | Sale | 28,000 | $1.2M | Jul 7 | SEC ↗ | |
| Director | Sale | 5,250 | $207K | Jul 7 | SEC ↗ | |
| Director | Sale | 3,000 | $120K | Jul 7 | SEC ↗ | |
| EVP, Chief Strategy Officer | Sale | 4,714 | $209K | Jun 17 | SEC ↗ | |
Schwarzkopf CynthiaFirst filing | Director | Sale | 19,500 | $814K | Jun 12 | SEC ↗ |
Jayabalan HarishFirst filing | EVP, CISO and CRO | Sale | 10,217 | $410K | Jun 10 | SEC ↗ |
Jayabalan HarishFirst filing | EVP, CISO and CRO | Sale | 9,783 | $392K | Jun 10 | SEC ↗ |
| Director | Sale | 3,000 | $128K | Jun 4 | SEC ↗ | |
| Director | Sale | 5,250 | $224K | Jun 4 | SEC ↗ | |
| EVP, GC & Corporate Secretary | Sale | 28,000 | $1.2M | Jun 4 | SEC ↗ | |
| EVP, Chief Strategy Officer | Sale | 16,000 | $674K | Jun 4 | SEC ↗ | |
| EVP and CIO | Sale | 48,000 | $2.1M | Jun 4 | SEC ↗ | |
| Chairman & CEO | Sale | 70,000 | $3.0M | Jun 4 | SEC ↗ | |
| EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $464K | Jun 4 | SEC ↗ | |
Emmons LanceFirst filing | EVP and CFO | Sale | 35,000 | $2.0M | May 18 | SEC ↗ |
| Chairman & CEO | Sale | 15,771 | $756K | May 7 | SEC ↗ | |
| Chairman & CEO | Sale | 54,229 | $2.6M | May 5 | SEC ↗ | |
| EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $520K | May 5 | SEC ↗ | |
| EVP, Chief Strategy Officer | Sale | 16,000 | $756K | May 5 | SEC ↗ | |
| Director | Sale | 3,000 | $142K | May 5 | SEC ↗ | |
| EVP and CIO | Sale | 48,000 | $2.3M | May 5 | SEC ↗ | |
| Director | Sale | 5,625 | $266K | May 5 | SEC ↗ | |
| EVP, GC & Corporate Secretary | Sale | 28,000 | $1.3M | May 5 | SEC ↗ | |
Gallagher Thomas P.First filing | Chairman & CEO | Sale | 224,025 | $9.7M | Apr 17 | SEC ↗ |
Comly Barbara J.First filing | EVP, GC & Corporate Secretary | Sale | 29,667 | $1.3M | Apr 17 | SEC ↗ |
Deitzel EdwardFirst filing | EVP, CRO, CCO MIAX Exchanges | Sale | 4,763 | $200K | Apr 9 | SEC ↗ |
Deitzel EdwardFirst filing | EVP, CRO, CCO MIAX Exchanges | Sale | 7,572 | $318K | Apr 9 | SEC ↗ |
| EVP, Chief Strategy Officer | Sale | 2,357 | $97K | Apr 9 | SEC ↗ | |
| EVP, Chief Strategy Officer | Sale | 900 | $38K | Apr 9 | SEC ↗ | |
| EVP, Chief Strategy Officer | Sale | 16,434 | $692K | Apr 9 | SEC ↗ | |
| Director | Sale | 2,700 | $108K | Apr 3 | SEC ↗ | |
Teekell Judson GrayFirst filing | Director | Sale | 300 | $12K | Mar 26 | SEC ↗ |
Brown ShellyFirst filing | EVP, Chief Strategy Officer | Sale | 25,932 | $1.0M | Mar 24 | SEC ↗ |
Eckert Kurt M.First filing | Director | Sale | 37,917 | $1.5M | Mar 20 | SEC ↗ |
Schafer Douglas M. JRFirst filing | EVP and CIO | Sale | 48,000 | $1.9M | Mar 18 | SEC ↗ |
| Director | Sale | 174,632 | $7.1M | Mar 6 | SEC ↗ | |
| Director | Purchase | 7,200 | $312K | Mar 6 | SEC ↗ | |
| Director | Purchase | 7,200 | $310K | Mar 6 | SEC ↗ | |
| Director | Purchase | 2,439 | $100K | Dec 15 | SEC ↗ | |
| Director | Purchase | 2 | $84 | Oct 6 | SEC ↗ | |
| Director | Purchase | 4 | $167 | Sep 30 | SEC ↗ | |
| Director | Purchase | 34,470 | $1.2M | Sep 30 | SEC ↗ |
Related companies
MIAMI INTERNATIONAL HOLDINGS, INC. is in the Finance & Insurance sector.