Murray Stahl bought $100k of MIAX
director at MIAMI INTERNATIONAL HOLDINGS, INC.. 2,439 shares at an average of $41.00, traded Dec 12, 2025, filed Dec 15, 2025.
Score components
- +15RoleDirector
- +10Trade size$100k at market
- -5Relative to holdingsUnder 1% of holdings (0.1%)
- +4Price context16% below the 52-week high
- 0ClusterNo other insider buying within 14 days
- +5Repeat buying3 buys in 90 days
- +10Track recordMedian 6-month excess return +20% over 57 past buys
What happened after comparable buys
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 0001437749-25-037835, as filed. Open on EDGAR
| Date | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|
| Dec 12, 2025 | POpen-market purchase Common Stockindirect: Horizon Kinetics Asset Management LLC | +2,439 | $41.00 | $100k | 4,560,364 | Dec 15, 2025 |
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% | |
| 7Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Shelly Brown EVP, Chief Strategy Officer | $209k 4,714 shares | -1% | |
| 0Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Shelly Brown EVP, Chief Strategy Officer | $674k 16,000 shares | -5% | |
| 2Weak | MIAMI INTERNATIONAL HOLDINGS, INC. | Shelly Brown EVP, Chief Strategy Officer | $756k 16,000 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.