Gallagher Thomas P. Insider Trading Activity

Corporate InsiderCEO · CIK 2080477

Total trades

$24.6M

Total volume

Aug 19, 2026

Last activity

MIAX

MIAMI INTERNATIONAL HOLDINGS, INC.

Gallagher Thomas P. has been net-selling over the last 12 months with 0 purchases and 9 sales across 1 company.

MIAX is the most-traded position with 9 trades. The largest single transaction was a sale of MIAX for $6.2M on Aug 19, 2026.

Performance Scorecard

Forward stock performance after each transaction by Gallagher Thomas P.. Buy returns measure price movement after open-market purchases; sell-avoided measures the loss avoided after open-market sales. Success rate counts trades where the insider's direction was right.

PERIOD	AVG BUY RETURN	AVG SELL AVOIDED	SUCCESS RATE	TRADES
30 days	+62.9%	-10.3%	38%	8
90 days	+115.1%	+3.6%	100%	6
120 days	+81.7%	-1.0%	25%	4

Performance based on stock price movement after each transaction date. Past results do not predict future returns. Not financial advice.

Price & Trades

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MIAX · MIAMI INTERNATIONAL HOLDINGS, INC.

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Recent Trades

DATE	TICKER	TYPE	SHARES	PRICE	VALUE	Δ OWNED	ROLE
Aug 19, 2026	MIAX	Sell	149,700	$41.13	$6.2M	−9.5%	CEO
Aug 4, 2026	MIAX	Sell	48,334	$45.69	$2.2M	−2.7%	CEO
Jul 7, 2026	MIAX	Sell	28,228	$42.27	$1.2M	−1.6%	CEO
Jul 6, 2026	MIAX	Sell	41,772	$42.09	$1.8M	−2.4%	CEO
May 5, 2026	MIAX	Sell	15,771	$47.92	$756K	−0.9%	CEO
May 4, 2026	MIAX	Sell	54,229	$47.26	$2.6M	−3.1%	CEO
Apr 15, 2026	MIAX	Sell	49,900	$43.68	$2.2M	−9.3%	CEO
Apr 15, 2026	MIAX	Sell	104,124	$43.36	$4.5M	−5.7%	CEO
Apr 15, 2026	MIAX	Sell	70,001	$43.36	$3.0M	−3.7%	CEO
Aug 13, 2025	MIAX	Buy	12,000	$23.00	$276K	—	CEO