Thomas P. Gallagher sold $2.0M of MIAX
Chairman & CEO at MIAMI INTERNATIONAL HOLDINGS, INC.. 47,000 shares at an average of $42.43, traded Sep 3, 2026, filed Sep 4, 2026.
Score components
- +25RoleCEO
- +25Trade size$2.0M at market
- 0Share of holdings soldSold 3.2% of holdings
- +15Cluster6 insiders selling within 14 days
- -15Exercise and sellShares came from an option exercise in the same filing
- -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 0002080477-26-000018, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Sep 3, 2026 | MOption exercise Common Stockindirect: By Gallagher Investments, LLC10b5-1 | +47,000 | $12.00 | $564k | 1,470,275 | 38 d ago |
| Sep 3, 2026 | SOpen-market sale Common Stockindirect: By Gallagher Investments, LLC10b5-1 | -47,000 | $42.43 | $2.0M | 1,423,275 | 38 d ago |
| Sep 3, 2026 | MOption exercise Common Stock10b5-1 | +16,666 | $12.00 | $200k | 760,605 | 38 d ago |
| Sep 3, 2026 | MOption exercise Common Stock10b5-1 | +8,333 | $12.00 | $100k | 768,938 | 38 d ago |
| Sep 3, 2026 | MOption exercise Common Stock10b5-1 | +13,140 | $15.22 | $200k | 782,078 | 38 d ago |
| Sep 3, 2026 | MOption exercise Common Stock10b5-1 | +4,464 | $22.40 | $100k | 786,542 | 38 d ago |
| Sep 3, 2026 | MOption exercise Nonqualified Stock Option (Right to Buy)derivativeindirect: By Gallagher Investments, LLC10b5-1 | -47,000 | $0.00 | $0 | 188,000 | 38 d ago |
| Sep 3, 2026 | MOption exercise Incentive Stock Option (Right to Buy)derivative10b5-1 | -16,666 | $0.00 | $0 | 0 | 38 d ago |
| Sep 3, 2026 | MOption exercise Incentive Stock Option (Right to Buy)derivative10b5-1 | -8,333 | $0.00 | $0 | 0 | 38 d ago |
| Sep 3, 2026 | MOption exercise Incentive Stock Option (Right to Buy)derivative10b5-1 | -13,140 | $0.00 | $0 | 0 | 38 d ago |
| Sep 3, 2026 | MOption exercise Incentive Stock Option (Right to Buy)derivative10b5-1 | -4,464 | $0.00 | $0 | 8,928 | 38 d ago |
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% | |
| 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% | |
| 28Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Shelly Brown EVP, Chief Strategy Officer | $1.0M 25,932 shares | -8% | |
| 18Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Kurt M. Eckert director | $1.5M 37,917 shares | -21% | |
| 43Moderate | MIAXbuy MIAMI INTERNATIONAL HOLDINGS, INC. | Murray Stahl director | $310k 7,200 shares | +0% | |
| 43Moderate | MIAXbuy MIAMI INTERNATIONAL HOLDINGS, INC. | Murray Stahl director | $312k 7,200 shares | +0% |
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.