Thomas P. Gallagher insider trades: Miami International Holdings (MIAX) stock buys and sales
Trades on the price chart
Daily close, with an arrow on each day they bought or sold
Companies
Where Thomas reports to the SEC
Open-market buys and sales
10 trades reported on SEC Form 4, newest first
| Date | Stock | Type | Shares | Price | Value | Holding | Reported |
|---|---|---|---|---|---|---|---|
| Sep 3, 2026 | MIAX | ↓ Sell | 47,000 | $42.43 | $2.0M | By Gallagher Investments, LLC | Sep 4, 2026 (1d) |
| Aug 19, 2026 | MIAX | ↓ Sell | 149,700 | $41.13 | $6.2M | By Gallagher Investments, LLC | Aug 20, 2026 (1d) |
| Jul 13, 2026 | MIAX | ↓ Sell | 70,000 | $42.52 | $3.0M | By Gallagher Investments, LLC | Jul 14, 2026 (1d) |
| Jul 7, 2026 | MIAX | ↓ Sell | 70,000 | $42.16 | $3.0M | By Gallagher Investments, LLC | Jul 7, 2026 (0d) |
| Jun 2, 2026 | MIAX | ↓ Sell | 70,000 | $42.36 | $3.0M | By Gallagher Investments, LLC | Jun 4, 2026 (2d) |
| May 5, 2026 | MIAX | ↓ Sell | 15,771 | $47.92 | $756K | By Gallagher Investments, LLC | May 7, 2026 (2d) |
| May 4, 2026 | MIAX | ↓ Sell | 54,229 | $47.26 | $2.6M | By Gallagher Investments, LLC | May 5, 2026 (1d) |
| Apr 15, 2026 | MIAX | ↓ Sell | 174,125 | $43.36 | $7.6M | By Gallagher Investments, LLC | Apr 17, 2026 (2d) |
| Apr 15, 2026 | MIAX | ↓ Sell | 49,900 | $43.68 | $2.2M | Direct | Apr 17, 2026 (2d) |
| Aug 13, 2025 | MIAX | ↑ Buy | 12,000 | $23.00 | $276K | Direct | Aug 15, 2025 (2d) |
Each row is one filing's trades in one stock, summed. Shares and prices are as filed, before any later stock split.
Other MIAX insiders
Open-market trades in the last 12 months
About Thomas P. Gallagher's insider trades
Thomas P. Gallagher is Chairman & CEO at Miami International Holdings (MIAX). Since Aug 13, 2025, Thomas has reported 1 open-market purchase worth $276K and 9 sales worth $30.1M on SEC Form 4. In the last 12 months: 9 sales ($30.1M).
Their filings also include option exercises (9 filings), shares withheld for taxes (4 filings), grants and awards (1 filing), conversions (1 filing). These aren't open-market trades and aren't counted above.
How to read insider trades
Officers, directors and owners of more than 10% of a company must report trades in its stock on SEC Form 4, usually within two business days. Purchases with their own money are the stronger signal: insiders sell for many reasons (taxes, diversification, a house), but buy for one. See every MIAX insider trade, the latest insider trades across the market, or cluster buys, when several insiders buy the same stock within days.