MIAX
MIAMI INTERNATIONAL HOLDINGS, INC. · Finance & Insurance · Market cap $3.3B
Insiders sold $29.0M net in the last 90 days ·10 sellers, 0 buyers· 20 of 20 sales under Rule 10b5-1 plans· latest Form 4 filed Oct 6, 2026
Insider Buying
$723K
reported purchases (SEC code P)
Insider Selling
$81.5M
reported sales (SEC code S)
Unique Insiders
11
in the rolling window
Latest filing
Oct 6, 2026
Schafer Douglas M. JR
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) has 114 SEC Form 4 filings (210 transaction rows) in the rolling window, disclosed by 11 distinct insiders. Most recent filing: Oct 6, 2026.
Inside the rolling window, 11 insiders at MIAMI INTERNATIONAL HOLDINGS, INC. reported 3 open-market purchases totaling $723K and 62 open-market sales totaling $81.5M. The most active filer is Chairman & CEO Gallagher Thomas P. with 10 filings. Insiders have net sold $68.5M over the trailing 6 months. The most recent open-market filing is a sale of 40,000 shares by EVP and CIO Schafer Douglas M. JR, dated Oct 2, 2026, worth $1.3M.
- Industry:Financial - Capital Markets
- CEO:Thomas Gallagher
- Employees:439
- HQ:Princeton, NJ, US
- IPO:2025-08-14
| Source | |||||||
|---|---|---|---|---|---|---|---|
| EVP and CIO | Sale | 40,000 | $1.3M | Oct 6 | +9.1% | SEC ↗ | |
| EVP, Chief Strategy Officer | Sale | 21,217 | $819K | Sep 17 | -10.8% | SEC ↗ | |
| Chairman & CEO | Sale | 47,000 | $2.0M | Sep 4 | -20.8% | SEC ↗ | |
| EVP and CIO | Sale | 48,000 | $1.9M | Sep 4 | -20.8% | SEC ↗ | |
| EVP, CRO, CCO MIAX Exchanges | Sale | 11,000 | $464K | Sep 4 | -20.8% | SEC ↗ | |
| EVP, GC & Corporate Secretary | Sale | 44,445 | $1.8M | Sep 4 | -20.8% | SEC ↗ | |
| Director | Sale | 8,545 | $353K | Sep 4 | -20.8% | SEC ↗ | |
| Chairman & CEO | Sale | 149,700 | $6.2M | Aug 20 | -18.7% | SEC ↗ | |
| Director | Sale | 5,000 | $214K | Aug 19 | -17.3% | 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 ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does MIAX have?
MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) has 114 SEC Form 4 filings (210 transaction rows) in the rolling 365-day window, disclosed by 11 distinct insiders. Most recent filing: Oct 6, 2026.
When was the most recent SEC Form 4 filing for MIAX?
The most recent Form 4 filing for MIAX on Tracefour is dated Oct 6, 2026.
Who is the most active insider at MIAX?
The most active SEC Form 4 filer at MIAX in the rolling window is Chairman & CEO Gallagher Thomas P., with 10 filings.
What is the net insider flow at MIAX over the last 6 months?
Over the trailing 180 days, insiders at MIAX have net sold $68.5M based on SEC Form 4 disclosures.
What is the total insider buy and sell value at MIAX in the current window?
Inside the rolling window, insiders at MIAX bought $723K and sold $81.5M based on SEC Form 4 filings.
Can I get alerts for MIAX insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
MIAMI INTERNATIONAL HOLDINGS, INC. is in the Finance & Insurance sector.