Miami International Hldgs Ownership & Insider Activity

Miami International Hldgs (MIAX) institutional and insider ownership, recent insider transactions and ownership breakdown.

Insiders own 3.5% of shares outstanding. Institutional investors hold 45.9%. Over the past 90 days, insiders made 6 sales worth $14.6M.

Shares Outstanding

99.231M

Shares Float

78.880M

Insider Shares Owned

3.410M

Insider % Owned

3.5%

Institutional Shares Held

45.524M

Institutional % Held

45.9%

Ownership Breakdown

Net Insider Activity by Month

Purchases (90d)

Sales (90d)

$14.6M total

Net Activity

Net Selling

Net Value (90d)

-$14.6M

Miami International Hldgs Insider Transactions (Last 6 Months)

Date	Insider	Title	Type	Shares	Price	Value
Aug 18, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL	300.000K	$41.77	$12.5M
Aug 17, 2026	Cynthia Schwarzkopf	DIRECTOR	SELL-OPTIONS	—	$27.43	$154K
Aug 17, 2026	Lance Emmons	EVP AND CFO	SELL	35.000K	$42.83	$1.5M
Aug 4, 2026	Kurt Eckert	DIRECTOR	SELL-OPTIONS	—	$28.90	$36K
Aug 4, 2026	Gray Judson Teekell	DIRECTOR	SELL	3.000K	$45.79	$137K
Aug 4, 2026	Harish Jayabalan	EVP, CISO AND CRO	SELL-OPTIONS	—	$29.42	$659K
Aug 4, 2026	Barbara Comly	EVP, GC & CORPORATE SECRETARY	SELL-OPTIONS	—	$28.84	$1.5M
Aug 4, 2026	Edward Deitzel	EVP, CRO, CCO MIAX EXCHANGES	SELL-OPTIONS	—	$28.89	$372K
Aug 4, 2026	Douglas Schafer JR	EVP AND CIO	SELL-OPTIONS	—	$28.86	$1.6M
Aug 4, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL-OPTIONS	—	$28.84	$1.6M
Jul 15, 2026	Cynthia Schwarzkopf	DIRECTOR	SELL-OPTIONS	—	$27.00	$150K
Jul 13, 2026	Barbara Comly	EVP, GC & CORPORATE SECRETARY	SELL-OPTIONS	—	$26.99	$839K
Jul 13, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL-OPTIONS	—	$27.26	$2.1M
Jul 6, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL-OPTIONS	—	$27.08	$2.1M
Jul 6, 2026	Harish Jayabalan	EVP, CISO AND CRO	SELL-OPTIONS	—	$27.06	$602K
Jul 6, 2026	Edward Deitzel	EVP, CRO, CCO MIAX EXCHANGES	SELL-OPTIONS	—	$27.02	$330K
Jul 6, 2026	Shelly Brown	EVP, CHIEF STRATEGY OFFICER	SELL-OPTIONS	—	$27.07	$482K
Jul 2, 2026	Gray Judson Teekell	DIRECTOR	SELL	3.000K	$40.00	$120K
Jul 2, 2026	Kurt Eckert	DIRECTOR	SELL-OPTIONS	—	$25.68	$144K
Jul 2, 2026	Barbara Comly	EVP, GC & CORPORATE SECRETARY	SELL-OPTIONS	—	$26.61	$818K
Jul 2, 2026	Douglas Schafer JR	EVP AND CIO	SELL-OPTIONS	—	$26.61	$1.4M
Jun 15, 2026	Shelly Brown	EVP, CHIEF STRATEGY OFFICER	SELL	4.714K	$44.23	$209K
Jun 11, 2026	Cynthia Schwarzkopf	DIRECTOR	SELL-OPTIONS	—	$26.86	$580K
Jun 8, 2026	Harish Jayabalan	EVP, CISO AND CRO	SELL-OPTIONS	—	$26.04	$562K
Jun 2, 2026	Gray Judson Teekell	DIRECTOR	SELL	3.000K	$42.78	$128K
Jun 2, 2026	Kurt Eckert	DIRECTOR	SELL-OPTIONS	—	$27.38	$161K
Jun 2, 2026	Barbara Comly	EVP, GC & CORPORATE SECRETARY	SELL-OPTIONS	—	$27.43	$864K
Jun 2, 2026	Edward Deitzel	EVP, CRO, CCO MIAX EXCHANGES	SELL-OPTIONS	—	$27.08	$332K
Jun 2, 2026	Douglas Schafer JR	EVP AND CIO	SELL-OPTIONS	—	$27.42	$1.5M
Jun 2, 2026	Shelly Brown	EVP, CHIEF STRATEGY OFFICER	SELL-OPTIONS	—	$27.06	$482K
Jun 2, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL-OPTIONS	—	$27.18	$2.1M
May 15, 2026	Lance Emmons	EVP AND CFO	SELL	35.000K	$56.36	$2.0M
May 5, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL-OPTIONS	—	$29.96	$566K
May 4, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL-OPTIONS	—	$29.63	$1.9M
May 4, 2026	Edward Deitzel	EVP, CRO, CCO MIAX EXCHANGES	SELL-OPTIONS	—	$29.64	$388K
May 4, 2026	Shelly Brown	EVP, CHIEF STRATEGY OFFICER	SELL-OPTIONS	—	$29.64	$564K
May 4, 2026	Gray Judson Teekell	DIRECTOR	SELL	3.000K	$47.30	$142K
May 4, 2026	Douglas Schafer JR	EVP AND CIO	SELL-OPTIONS	—	$29.63	$1.7M
May 4, 2026	Kurt Eckert	DIRECTOR	SELL-OPTIONS	—	$29.64	$199K
May 4, 2026	Barbara Comly	EVP, GC & CORPORATE SECRETARY	SELL-OPTIONS	—	$29.63	$987K
Apr 15, 2026	Thomas Gallagher	CHAIRMAN & CEO	SELL	154.024K	$27.72	$8.9M
Apr 15, 2026	Barbara Comly	EVP, GC & CORPORATE SECRETARY	SELL-OPTIONS	—	$27.82	$939K
Apr 8, 2026	Shelly Brown	EVP, CHIEF STRATEGY OFFICER	SELL-OPTIONS	—	$27.04	$494K
Apr 7, 2026	Edward Deitzel	EVP, CRO, CCO MIAX EXCHANGES	SELL-OPTIONS	—	$27.01	$370K
Apr 6, 2026	Shelly Brown	EVP, CHIEF STRATEGY OFFICER	SELL	3.257K	$41.52	$135K
Apr 2, 2026	Gray Judson Teekell	DIRECTOR	SELL	2.700K	$40.00	$108K
Mar 25, 2026	Gray Judson Teekell	DIRECTOR	SELL	300.000	$40.00	$12K
Mar 23, 2026	Shelly Brown	EVP, CHIEF STRATEGY OFFICER	SELL	25.932K	$39.33	$1.0M
Mar 19, 2026	Kurt Eckert	DIRECTOR	SELL	25.000K	$25.50	$1.3M
Mar 17, 2026	Douglas Schafer JR	EVP AND CIO	SELL-OPTIONS	—	$25.87	$1.3M

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Congressional Trading Activity

Date	Member	Party	Chamber	Action	Amount
Mar 20, 2026	Gilbert Ray Cisneros	D	House	P	$15,001 - $50,000

Miami International Holdings Inc