MIAX insider buying
2 cluster buysMIAMI INTERNATIONAL HOLDINGS, INC. · Financials
When two or more insiders at MIAMI INTERNATIONAL HOLDINGS, INC. buy MIAX on the open market around the same time, that clustered conviction is one of the highest-signal patterns in SEC filing data. Below is every cluster we've detected in MIAX plus the full record of qualifying open-market buys, each parsed directly from Form 4 filings and linked back to the source on SEC EDGAR.
Detected clusters
- Mar 4 – Mar 5, 2026Detected Mar 5, 20262 insidersTotal bought$622.5KMarket cap$4.0B
- Aug 13 – Aug 28, 2025Detected Aug 28, 2025High conviction4 insidersTotal bought$1.8MMarket cap$4.0B
All notable open-market buys in MIAX
Every open-market Form 4 purchase, newest first. Click an insider to see their full buying record across companies.
| Date | Insider | Shares | Price | Value | Filing |
|---|---|---|---|---|---|
| Mar 5, 2026 | STAHL MURRAYcluster Director, 10% Owner | 7,200 | $43.08 | $310.2K | SEC ↗ |
| Mar 4, 2026 | 7,200 | $43.38 | $312.3K | SEC ↗ | |
| Dec 12, 2025 | Director, 10% Owner | 2,439 | $41.00 | $100.0K | SEC ↗ |
| Oct 3, 2025 | 2 | $41.97 | $83.9 | SEC ↗ | |
| Sep 26, 2025 | Director, 10% Owner | 4 | $41.76 | $167.0 | SEC ↗ |
| Aug 28, 2025 | 34,470 | $36.10 | $1.2M | SEC ↗ | |
| Aug 14, 2025 | EVP and CFO | 4 | $31.44 | $125.8 | SEC ↗ |
| Aug 13, 2025 | Gallagher Thomas P.cluster Director, Chairman & CEO | 12,000 | $23.00 | $276.0K | SEC ↗ |
| Aug 13, 2025 | Moore Lisacluster Director | 5,500 | $23.00 | $126.5K | SEC ↗ |
| Aug 13, 2025 | Smollen Johncluster EVP Traded Products & Relation | 5,000 | $23.00 | $115.0K | SEC ↗ |
| Aug 13, 2025 | Director | 3,500 | $23.00 | $80.5K | SEC ↗ |
| Aug 13, 2025 | EVP, CISO and CRO | 2,500 | $23.00 | $57.5K | SEC ↗ |
| Aug 13, 2025 | Director | 2,500 | $23.00 | $57.5K | SEC ↗ |
| Aug 13, 2025 | Director | 2,500 | $23.00 | $57.5K | SEC ↗ |
| Aug 13, 2025 | Director | 1,500 | $23.00 | $34.5K | SEC ↗ |
| Aug 13, 2025 | Director | 1,000 | $23.00 | $23.0K | SEC ↗ |
| Aug 13, 2025 | Director | 1,000 | $23.00 | $23.0K | SEC ↗ |
| Aug 13, 2025 | Director | 500 | $23.00 | $11.5K | SEC ↗ |
| Aug 13, 2025 | EVP, CRO, CCO MIAX Exchanges | 100 | $23.00 | $2.3K | SEC ↗ |
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MIAX insider buying — FAQ
- Are insiders buying MIAX stock?
- Yes — 14 distinct insiders have bought MIAX (MIAMI INTERNATIONAL HOLDINGS, INC.) on the open market, including 2 cluster buys where two or more insiders bought within a rolling window. The most recent qualifying activity was Mar 6, 2026.
- How much MIAX stock have insiders bought?
- Insiders have bought a combined $2.8M of MIAX across 19 open-market purchases, based on SEC Form 4 filings.
- What is an insider cluster buy in MIAX?
- A cluster buy is two or more distinct MIAMI INTERNATIONAL HOLDINGS, INC. insiders — officers, directors, or 10% owners — each buying MIAX on the open market within a rolling window. MIAX has 2 detected cluster buys to date.
- Where does this MIAX insider trading data come from?
- Every figure is parsed directly from SEC Form 4 filings on EDGAR, and each purchase on this page links back to its original filing document.
How we track insider buying in MIAX
We continuously poll SEC EDGAR for new Form 4 filings and parse every open-market purchase (transaction code P). A cluster is recorded when two or more distinct insiders — officers, directors, or 10% owners — each buy MIAX within a rolling window. We track clusters at every company size, from micro-caps to mega-caps. Every figure on this page traces back to an official filing; open any row to jump straight to the source document. What counts as a cluster buy?
This page is informational and reflects public filing data. It is not investment advice or a recommendation regarding MIAX.