MIAX

Miami International Holdings, Inc. $47.26+0.55 (+1.18%)

Prev Close$46.72·MCap$4.25B·P/E—·Vol835.2K·Yield—

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Buys (12M)

$2.44M

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Sells (12M)

$21.45M

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Net Activity

Net Seller

$19.01M

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Active Insiders

last 12 mo

Over the past 12 months, insider activity at Miami International Holdings, Inc. (MIAX) has been dominated by selling, with 13 insider purchases totaling $2.44M and 14 insider sales totaling $21.45M. The most recent insider transaction was by Gallagher Thomas P. (director, officer: Chairman & CEO), who sold $9.73M worth of shares on Apr 17, 2026. Miami International Holdings, Inc. operates in the Financial Services sector, within the Financial - Capital Markets industry, with a market cap of $4.25B.

MIAX Insider Trading Activity

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Apr 17, 2026	Gallagher Thomas P.	director, officer: Chairman & CEO	Sell	224,025	$43.43	$9.73M	1,827,399
Apr 17, 2026	Comly Barbara J.	officer: EVP, GC & Corporate Secretary	Sell	29,667	$43.64	$1.29M	843,844
Apr 9, 2026	Brown Shelly	officer: EVP, Chief Strategy Officer	Sell	16,434	$42.08	$691.5K	325,047
Apr 9, 2026	Deitzel Edward	officer: EVP, CRO, CCO MIAX Exchanges	Sell	11,573	$42.01	$486.2K	116,221
Apr 8, 2026	Brown Shelly	officer: EVP, Chief Strategy Officer	Sell	3,257	$41.52	$135.2K	325,047
Apr 3, 2026	Teekell Judson Gray	director	Sell	2,700	$40.00	$108.0K	59,338
Mar 26, 2026	Teekell Judson Gray	director	Sell	300	$40.00	$12.0K	62,038
Mar 24, 2026	Brown Shelly	officer: EVP, Chief Strategy Officer	Sell	25,932	$39.33	$1.02M	299,197
Mar 20, 2026	Eckert Kurt M.	director	Sell	37,917	$39.00	$1.48M	142,375
Mar 18, 2026	Schafer Douglas M. JR	officer: EVP and CIO	Sell	48,000	$39.74	$1.91M	396,681
Mar 6, 2026	STAHL MURRAY	director	Buy	7,200	$43.08	$310.2K	4,633,842
Mar 6, 2026	STAHL MURRAY	director	Sell	53,578	$40.92	$2.19M	4,619,442
Feb 18, 2026	Brown Shelly	EVP, Chief Strategy Officer	Sell	19,902	$40.89	$813.8K	0
Feb 18, 2026	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Sell	6,035	$40.89	$246.8K	0
Feb 18, 2026	Schafer Douglas M. JR	EVP and CIO	Sell	32,565	$40.89	$1.33M	0
Dec 15, 2025	STAHL MURRAY	Director	Buy	2,439	$41.00	$100.0K	4,560,364
Oct 6, 2025	STAHL MURRAY	Director	Buy	2	$41.97	$83.94	4,557,925
Sep 30, 2025	STAHL MURRAY	Director	Buy	34,474	$36.10	$1.24M	4,557,923
Aug 18, 2025	Emmons Lance	EVP and CFO	Buy	4	$31.44	$125.76	4
Aug 15, 2025	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Buy	100	$23.00	$2.3K	32,193
Aug 15, 2025	Gallagher Thomas P.	Chairman & CEO	Buy	12,000	$23.00	$276.0K	12,000
Aug 15, 2025	Jayabalan Harish	EVP, CISO and CRO	Buy	2,500	$23.00	$57.5K	6,443+63%
Aug 15, 2025	Massad Mark I.	Director	Buy	5,500	$23.00	$126.5K	3,500
Aug 15, 2025	Moore Lisa	Director	Buy	5,500	$23.00	$126.5K	5,500
Aug 15, 2025	Nazarali Jamil	Director	Buy	2,500	$23.00	$57.5K	2,500
Aug 15, 2025	Smollen John	EVP Traded Products & Relation	Buy	5,000	$23.00	$115.0K	7,226+225%
Aug 15, 2025	Stahlin Paul	Director	Buy	1,000	$23.00	$23.0K	1,000

MIAX Insider Buying Activity

The following table shows recent insider purchases of Miami International Holdings, Inc. (MIAX) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Mar 6, 2026	STAHL MURRAY	director	Buy	7,200	$43.08	$310.2K	4,633,842
Dec 15, 2025	STAHL MURRAY	Director	Buy	2,439	$41.00	$100.0K	4,560,364
Oct 6, 2025	STAHL MURRAY	Director	Buy	2	$41.97	$83.94	4,557,925
Sep 30, 2025	STAHL MURRAY	Director	Buy	34,474	$36.10	$1.24M	4,557,923
Aug 18, 2025	Emmons Lance	EVP and CFO	Buy	4	$31.44	$125.76	4
Aug 15, 2025	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Buy	100	$23.00	$2.3K	32,193
Aug 15, 2025	Gallagher Thomas P.	Chairman & CEO	Buy	12,000	$23.00	$276.0K	12,000
Aug 15, 2025	Jayabalan Harish	EVP, CISO and CRO	Buy	2,500	$23.00	$57.5K	6,443+63%
Aug 15, 2025	Massad Mark I.	Director	Buy	5,500	$23.00	$126.5K	3,500
Aug 15, 2025	Moore Lisa	Director	Buy	5,500	$23.00	$126.5K	5,500
Aug 15, 2025	Nazarali Jamil	Director	Buy	2,500	$23.00	$57.5K	2,500
Aug 15, 2025	Smollen John	EVP Traded Products & Relation	Buy	5,000	$23.00	$115.0K	7,226+225%
Aug 15, 2025	Stahlin Paul	Director	Buy	1,000	$23.00	$23.0K	1,000

MIAX Insider Selling Activity

The following table shows recent insider sales of Miami International Holdings, Inc. (MIAX) stock reported via SEC Form 4 filings.

Date	Insider	Role	Type	Shares	Avg Price	Value	Shares After
Apr 17, 2026	Gallagher Thomas P.	director, officer: Chairman & CEO	Sell	224,025	$43.43	$9.73M	1,827,399
Apr 17, 2026	Comly Barbara J.	officer: EVP, GC & Corporate Secretary	Sell	29,667	$43.64	$1.29M	843,844
Apr 9, 2026	Brown Shelly	officer: EVP, Chief Strategy Officer	Sell	16,434	$42.08	$691.5K	325,047
Apr 9, 2026	Deitzel Edward	officer: EVP, CRO, CCO MIAX Exchanges	Sell	11,573	$42.01	$486.2K	116,221
Apr 8, 2026	Brown Shelly	officer: EVP, Chief Strategy Officer	Sell	3,257	$41.52	$135.2K	325,047
Apr 3, 2026	Teekell Judson Gray	director	Sell	2,700	$40.00	$108.0K	59,338
Mar 26, 2026	Teekell Judson Gray	director	Sell	300	$40.00	$12.0K	62,038
Mar 24, 2026	Brown Shelly	officer: EVP, Chief Strategy Officer	Sell	25,932	$39.33	$1.02M	299,197
Mar 20, 2026	Eckert Kurt M.	director	Sell	37,917	$39.00	$1.48M	142,375
Mar 18, 2026	Schafer Douglas M. JR	officer: EVP and CIO	Sell	48,000	$39.74	$1.91M	396,681
Mar 6, 2026	STAHL MURRAY	director	Sell	53,578	$40.92	$2.19M	4,619,442
Feb 18, 2026	Brown Shelly	EVP, Chief Strategy Officer	Sell	19,902	$40.89	$813.8K	0
Feb 18, 2026	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Sell	6,035	$40.89	$246.8K	0
Feb 18, 2026	Schafer Douglas M. JR	EVP and CIO	Sell	32,565	$40.89	$1.33M	0