Company profile
Miami International Holdings, Inc. Insider Trading
MIAXEvery SEC Form 4 insider trading filing for Miami International Holdings, Inc. (MIAX) since April 2023 — open-market buys and sells by directors and officers, option exercises, and cluster activity, updated as each filing is reported to the SEC. Why 2023?
- Exchange
- NYSE
- Sector
- Security Brokers, Dealers & Flotation Companies
- CIK
- 0001438472
- Filings
- 149
- Insiders
- 26
- Last filing
- 2026-09-16
Activity summary
Recent insider activity is bullish. Over the last 30 days, 8 insiders purchased shares versus 2 sales. Buying was led by Thomas P. Gallagher.
Quarterly balance
Buy and sell value by quarter, Q3 25 to Q3 26. Miami International Holdings, Inc. insiders are net sellers across the period shown.
Bars below the rule are sales, above are purchases. Largest quarter on the chart is $45.0M.
90 day insight
Over the last 90 days, Miami International Holdings, Inc. insiders bought $600K (8 transactions) and sold $9.1M (4 transactions).
- Most active insider: Thomas P. Gallagher with 16 transactions totaling $18.5M.
- Largest single sale: $6.4M by Thomas P. Gallagher on Aug 18, 2026.
- 78% of recent sales were pre-scheduled 10b5-1 trades — typically less informative than open-market activity.
Activity skews bullish — buys outpace sales.
Insider Transactions
Sourced from SEC EDGAR Form 4 filings. Updated hourly.
| Date | Insider | Company | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Sep 16, 2026 | Shelly Brown | MIAX | Sale10b5 | 21,217 | $38.61 | $819K |
| Sep 11, 2026 | Shelly Brown | MIAX | Tax Withholding | 16,283 | $42.54 | $693K |
| Sep 3, 2026 | Edward Deitzel | MIAX | Option Exercise10b5 | 11,000 | $12.00 | $132K |
| Sep 3, 2026 | Edward Deitzel | MIAX | Sale10b5 | 11,000 | $42.21 | $464K |
| Sep 3, 2026 | Edward Deitzel | MIAX | Option Exercise10b5 | 11,000 | — | — |
45 more transactions hidden
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Query this yourself
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-H "X-Api-Key: $KEY"Top insiders
By total value filed.
Institutional Ownership
Top 13F-HR holders of Miami International Holdings, Inc. as of 2026-06-30
Data source: quarterly 13F-HR filings — institutional holders report positions within 45 days of quarter end. Joined with insider activity above — see who's loading up institutionally while insiders are trading. Full 13F-HR API →