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Miami International Holdings, Inc. (New York Stock Exchange:MIAX)
US · Delayed Price · Currency is USD
33.98-1.01 (-2.89%)
Insider Score
/ 100
MIAX Insider Score
MIAMI INTERNATIONAL HOLDINGS, INC. has a live Insider Score.
Scored on 0 qualifying trades from 0 insiders in the last 90 days.
MIAX Stock Insider Trading Activity
MIAX stock’s insider trading shows 13 sales on the open market for an estimated $17.13M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Schafer Douglas M. JR Other | Option exercise | 40,000 | $12.00 | $480.00K | 10.3% | 427,414 | Oct 2, 2026 | — | Form 4 |
| Schafer Douglas M. JR Other | Sell | 40,000 | $33.34 | $1.33M | 9.4% | 387,414 | Oct 2, 2026 | — | Form 4 |
| Jayabalan Harish Other | Option exercise | 8,333 | $12.00 | $100.00K | 10.7% | 86,398 | Sep 25, 2026 | — | Form 4 |
| Brown Shelly Other | Sell | 21,217 | $38.61 | $819.19K | 6.3% | 316,490 | Sep 16, 2026 | — | Form 4 |
| Brown Shelly Other | Tax withheld | 16,283 | $42.54 | $692.68K | 4.6% | 337,707 | Sep 11, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Option exercise | 8,333 | $12.00 | $100.00K | 1.1% | 768,938 | Sep 3, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Option exercise | 13,140 | $15.22 | $199.99K | 1.7% | 782,078 | Sep 3, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Option exercise | 4,464 | $22.40 | $99.99K | 0.6% | 786,542 | Sep 3, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Sell | 47,000 | $42.43 | $1.99M | 3.2% | 1,423,275 | Sep 3, 2026 | — | Form 4 |
| Deitzel Edward Other | Sell | 11,000 | $42.21 | $464.31K | 8.4% | 119,601 | Sep 3, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Option exercise | 47,000 | $12.00 | $564.00K | 3.3% | 1,470,275 | Sep 3, 2026 | — | Form 4 |
| Deitzel Edward Other | Option exercise | 11,000 | $12.00 | $132.00K | 9.2% | 130,601 | Sep 3, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Option exercise | 16,666 | $12.00 | $199.99K | 2.2% | 760,605 | Sep 3, 2026 | — | Form 4 |
| Schafer Douglas M. JR Other | Option exercise | 4,666 | $12.00 | $55.99K | 1.1% | 435,414 | Sep 2, 2026 | — | Form 4 |
| Schafer Douglas M. JR Other | Option exercise | 43,334 | $12.00 | $520.01K | 11.2% | 430,748 | Sep 2, 2026 | — | Form 4 |
| Comly Barbara J. Other | Option exercise | 44,445 | $12.00 | $533.34K | 5.3% | 884,009 | Sep 2, 2026 | — | Form 4 |
| Schafer Douglas M. JR Other | Sell | 48,000 | $40.48 | $1.94M | 11.0% | 387,414 | Sep 2, 2026 | — | Form 4 |
| Teekell Judson Gray Director | Sell | 5,545 | $41.58 | $230.56K | 6.4% | 81,000 | Sep 2, 2026 | — | Form 4 |
| Teekell Judson Gray Director | Sell | 3,000 | $40.89 | $122.67K | 4.2% | 69,251 | Sep 2, 2026 | — | Form 4 |
| Comly Barbara J. Other | Sell | 44,445 | $40.49 | $1.80M | 5.0% | 839,564 | Sep 2, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Sell | 149,700 | $41.13 | $6.16M | 9.5% | 1,423,275 | Aug 19, 2026 | — | Form 4 |
| Gallagher Thomas P. CEO | Tax withheld | 150,300 | $42.41 | $6.37M | 8.7% | 1,572,975 | Aug 18, 2026 | — | Form 4 |
| Comly Barbara J. Other | Tax withheld | 43,420 | $42.41 | $1.84M | 4.9% | 839,564 | Aug 18, 2026 | — | Form 4 |
| Schwarzkopf Cynthia Director | Sell | 5,000 | $42.85 | $214.25K | 5.3% | 88,545 | Aug 17, 2026 | — | Form 4 |
| Emmons Lance CFO | Sell | 35,000 | $42.83 | $1.50M | 28.8% | 86,538 | Aug 17, 2026 | — | Form 4 |
| Schwarzkopf Cynthia Director | Option exercise | 5,000 | $12.00 | $60.00K | 5.6% | 93,545 | Aug 17, 2026 | — | Form 4 |
| Eckert Kurt M. Director | Sell | 1,063 | $45.80 | $48.69K | 0.7% | 149,612 | Aug 4, 2026 | — | Form 4 |
| Deitzel Edward Other | Sell | 11,000 | $45.78 | $503.58K | 8.4% | 119,601 | Aug 4, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.