Thomas P. Gallagher sold $6.2M of MIAX
Chairman & CEO at MIAMI INTERNATIONAL HOLDINGS, INC.. 149,700 shares at an average of $41.13, traded Aug 19, 2026, filed Aug 20, 2026.
Score components
- +25RoleCEO
- +25Trade size$6.2M at market
- 0Share of holdings soldSold 9.5% of holdings
- +15Cluster6 insiders selling within 14 days
- -2010b5-1 planPre-scheduled under a 10b5-1 plan
What happened after comparable sells
Same side and tier, against the S&P 500, at 1, 3 and 6 months. Shown to Pro users; the whole table is on the backtest page.
Price around the trade, and since
From a quarter before the trade to today. The arrow is the trade, the circle the day the filing reached EDGAR, which is the first day anyone outside could act; the dotted line is the S&P 500 rebased to that day's close.
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value; the dashed line is the close on the filing day, the dotted line SPY rebased to it.Charts by TradingView Lightweight Charts™
Rows in this filing
Every transaction in Form 4 0002080477-26-000016, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Aug 18, 2026 | FTax withholding Common Stockindirect: By Gallagher Investments, LLC10b5-1 | -150,300 | $42.41 | $6.4M | 1,572,975 | Aug 20, 2026 |
| Aug 19, 2026 | SOpen-market sale Common Stockindirect: By Gallagher Investments, LLC10b5-1 | -149,700 | $41.13 | $6.2M | 1,423,275 | Aug 20, 2026 |
Related signals
Other insiders at MIAMI INTERNATIONAL HOLDINGS, INC. and this insider’s other filings.
| Score | Company | Insider | Value | Holdings | Filed |
|---|---|---|---|---|---|
| 5Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Douglas M. Schafer JR EVP and CIO | $1.3M 40,000 shares | -9% | |
| 32Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Shelly Brown EVP, Chief Strategy Officer | $819k 21,217 shares | -6% | |
| 20Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Barbara J. Comly EVP, GC & Corporate Secretary | $1.8M 44,445 shares | -5% | |
| 12Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Edward Deitzel EVP, CRO, CCO MIAX Exchanges | $464k 11,000 shares | -8% | |
| 30Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Thomas P. Gallagher Chairman & CEO | $2.0M 47,000 shares | -3% | |
| 25Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Judson Gray Teekell director | $353k 8,545 shares | -10% | |
| 25Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Douglas M. Schafer JR EVP and CIO | $1.9M 48,000 shares | -11% | |
| 52Moderate | MIAMI INTERNATIONAL HOLDINGS, INC. | Lance Emmons EVP and CFO | $1.5M 35,000 shares | -29% | |
| 7Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Cynthia Schwarzkopf director | $214k 5,000 shares | -5% | |
| 20Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Barbara J. Comly EVP, GC & Corporate Secretary | $2.0M 44,445 shares | -5% |
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.