MIAMI INTERNATIONAL HOLDINGS, INC. Insider Trading Activity
Every SEC Form 4 insider transaction reported for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX), sourced directly from SEC EDGAR and updated as new filings are accepted.
By Trabud · Insider-trading data from SEC EDGAR
Latest filing:
Compiled automatically from SEC EDGAR Form 4 filings and refreshed daily. Figures count purchases (code P) and sales (code S) only — not grants, option exercises, or gifts. How this page is built. Not investment advice.
Quick Answer
Are MIAX insiders buying or selling?
In the last 12 months, MIAMI INTERNATIONAL HOLDINGS, INC. insiders reported 3 open-market purchases ($934.8K) and 60 sales ($81.6M) — net selling of $80.7M. Since August 2025, Trabud has recorded 76 Form 4 filings for MIAX: 16 buys ($3.0M) and 60 sells ($81.6M).
Source: SEC EDGAR Form 4
What stands out
- The largest open-market purchase in the last 12 months was $312.3K by Murray Stahl (Director) on Mar 6, 2026. SEC ↗
- The most recent open-market purchase was reported on Mar 6, 2026 (7 months ago).
Key Statistics (August 2025 – Oct 6, 2026)
Total Form 4 filings
76
SEC EDGAR
Insider filers
17
Insider buys (16)
$3.0M
Insider sells (60)
$81.6M
Insider sentiment
Net sellingNet insider flow of $78.6M in net selling since August 2025, and $80.7M in net selling over the last 12 months.
Recent MIAX insider transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| Oct 6, 2026 | Douglas M. Schafer JR | EVP and CIO | Sale | 40.0K | $33.34 | $1.3M | SEC ↗ |
| Sep 17, 2026 | Shelly Brown | EVP, Chief Strategy Officer | Sale | 21.2K | $38.61 | $819.2K | SEC ↗ |
| Sep 4, 2026 | Thomas P. Gallagher | Chairman & CEO | Sale | 47.0K | $42.43 | $2.0M | SEC ↗ |
| Sep 4, 2026 | Barbara J. Comly | EVP, GC & Corporate Secretary | Sale | 44.4K | $40.49 | $1.8M | SEC ↗ |
| Sep 4, 2026 | Edward Deitzel | EVP, CRO, CCO MIAX Exchanges | Sale | 11.0K | $42.21 | $464.3K | SEC ↗ |
| Sep 4, 2026 | Douglas M. Schafer JR | EVP and CIO | Sale | 48.0K | $40.48 | $1.9M | SEC ↗ |
| Sep 4, 2026 | Judson Gray Teekell | Director | Sale | 8.5K | $41.34 | $353.2K | SEC ↗ |
| Aug 20, 2026 | Thomas P. Gallagher | Chairman & CEO | Sale | 149.7K | $41.13 | $6.2M | SEC ↗ |
| Aug 19, 2026 | Cynthia Schwarzkopf | Director | Sale | 5.0K | $42.85 | $214.3K | SEC ↗ |
| Aug 19, 2026 | Lance Emmons | EVP and CFO | Sale | 35.0K | $42.83 | $1.5M | SEC ↗ |
| Aug 6, 2026 | Kurt M. Eckert | Director | Sale | 1.1K | $45.80 | $48.7K | SEC ↗ |
| Aug 6, 2026 | Judson Gray Teekell | Director | Sale | 3.0K | $45.79 | $137.4K | SEC ↗ |
| Aug 6, 2026 | Harish Jayabalan | EVP, CISO and CRO | Sale | 20.0K | $45.90 | $918.0K | SEC ↗ |
| Aug 6, 2026 | Barbara J. Comly | EVP, GC & Corporate Secretary | Sale | 44.4K | $45.69 | $2.0M | SEC ↗ |
| Aug 6, 2026 | Edward Deitzel | EVP, CRO, CCO MIAX Exchanges | Sale | 11.0K | $45.78 | $503.6K | SEC ↗ |
| Aug 6, 2026 | Douglas M. Schafer JR | EVP and CIO | Sale | 48.0K | $45.71 | $2.2M | SEC ↗ |
| Aug 6, 2026 | Thomas P. Gallagher | Chairman & CEO | Sale | 48.3K | $45.69 | $2.2M | SEC ↗ |
| Jul 16, 2026 | Cynthia Schwarzkopf | Director | Sale | 5.0K | $42.00 | $210.0K | SEC ↗ |
| Jul 14, 2026 | Barbara J. Comly | EVP, GC & Corporate Secretary | Sale | 28.0K | $41.98 | $1.2M | SEC ↗ |
| Jul 14, 2026 | Thomas P. Gallagher | Chairman & CEO | Sale | 70.0K | $42.52 | $3.0M | SEC ↗ |
| Jul 7, 2026 | Thomas P. Gallagher | Chairman & CEO | Sale | 70.0K | $42.16 | $3.0M | SEC ↗ |
| Jul 7, 2026 | Harish Jayabalan | EVP, CISO and CRO | Sale | 20.0K | $42.12 | $842.4K | SEC ↗ |
| Jul 7, 2026 | Edward Deitzel | EVP, CRO, CCO MIAX Exchanges | Sale | 11.0K | $42.04 | $462.4K | SEC ↗ |
| Jul 7, 2026 | Shelly Brown | EVP, Chief Strategy Officer | Sale | 16.0K | $42.13 | $674.1K | SEC ↗ |
| Jul 7, 2026 | Judson Gray Teekell | Director | Sale | 3.0K | $40.00 | $120.0K | SEC ↗ |
Showing the 25 most recent of 76 Form 4 filings for MIAMI INTERNATIONAL HOLDINGS, INC..
Most active MIAX insiders
- Thomas P. Gallagher10 filings
- Shelly Brown9 filings
- Murray Stahl8 filings
- Barbara J. Comly7 filings
- Douglas M. Schafer JR7 filings
Ask anything about MIAX insider activity
Use Trabud's AI agent to query MIAMI INTERNATIONAL HOLDINGS, INC.'s Form 4 history in plain English — "Show me MIAX CEO purchases this year" or compare it against any other ticker.
Open the AI agentMIAX insider trading FAQ
Are MIAMI INTERNATIONAL HOLDINGS, INC. insiders buying or selling?
In the last 12 months, MIAMI INTERNATIONAL HOLDINGS, INC. insiders reported 3 open-market purchases ($934.8K) and 60 sales ($81.6M) — net selling of $80.7M. Since August 2025, Trabud has recorded 76 Form 4 filings for MIAX: 16 buys ($3.0M) and 60 sells ($81.6M). Over the full record that is net selling of $78.6M.
How many insiders trade MIAX stock?
17 distinct insider filers — officers, directors, 10%+ owners, and investment groups filing jointly — have reported Form 4 transactions for MIAMI INTERNATIONAL HOLDINGS, INC.. The most recent filing was accepted on Oct 6, 2026.
Where does Trabud get MIAX insider trading data?
All MIAX insider trading data comes directly from official SEC EDGAR Form 4 filings, which corporate insiders must submit within two business days of a transaction under Section 16(a) of the Securities Exchange Act of 1934.