Stocks
MIAX Miami International Holdings, Inc.

MIAX

Miami International Holdings, Inc.

Company with tickers: MIAX

CIK

1438472

CUSIP

59356Q108

Shares Outstanding

94,907,086

Price History Institutional Holders Short Volume Short Interest Fails to Deliver Financials SEC Filings Earnings Calls Insider Trades Congressional Trades

Date	Insider	Role	Type	Shares	Price	Value	After
2026-05-19	HORIZON KINETICS ASSET MANAGEMENT LLC	10% Owner	Other	2,455,744	—	—	2,170,898
2026-05-19	Teekell Judson Gray	Director	Tax	4,991	$54.51	$272,059	74,014
2026-05-19	Teekell Judson Gray	Director	Convert	22,667	—	—	0
2026-05-19	Teekell Judson Gray	Director	Convert	22,667	$12.00	$272,004	79,005
2026-05-15	Emmons Lance	EVP and CFO	Sell	35,000	$56.36	$1,972,600	84,262
2026-05-11	Gallagher Thomas P.	Director, Chairman & CEO	Convert	24,999	$12.00	$299,988	510,962
2026-05-11	Gallagher Thomas P.	Director, Chairman & CEO	Convert	24,999	—	—	0
2026-05-05	Gallagher Thomas P.	Director, Chairman & CEO	Sell	15,771	$47.92	$755,746	1,723,275
2026-05-05	Gallagher Thomas P.	Director, Chairman & CEO	Convert	15,771	—	—	210,000
2026-05-05	Gallagher Thomas P.	Director, Chairman & CEO	Convert	15,771	$12.00	$189,252	1,739,046
2026-05-04	Gallagher Thomas P.	Director, Chairman & CEO	Convert	54,229	—	—	225,771
2026-05-04	Gallagher Thomas P.	Director, Chairman & CEO	Sell	54,229	$47.26	$2,562,863	1,723,275
2026-05-04	Gallagher Thomas P.	Director, Chairman & CEO	Convert	54,229	$12.00	$650,748	1,777,504
2026-05-04	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Sell	11,000	$47.28	$520,080	116,221
2026-05-04	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	11,000	—	—	18,333
2026-05-04	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	11,000	$12.00	$132,000	127,221
2026-05-04	Brown Shelly	EVP, Chief Strategy Officer	Convert	16,000	$12.00	$192,000	341,047
2026-05-04	Brown Shelly	EVP, Chief Strategy Officer	Convert	16,000	—	—	32,000
2026-05-04	Brown Shelly	EVP, Chief Strategy Officer	Sell	16,000	$47.28	$756,480	325,047
2026-05-04	Teekell Judson Gray	Director	Sell	3,000	$47.30	$141,900	56,338
2026-05-04	Schafer Douglas M. JR	EVP and CIO	Convert	48,000	—	—	54,000
2026-05-04	Schafer Douglas M. JR	EVP and CIO	Sell	48,000	$47.25	$2,268,000	396,681
2026-05-04	Schafer Douglas M. JR	EVP and CIO	Convert	48,000	$12.00	$576,000	444,681
2026-05-04	Eckert Kurt M.	Director	Convert	5,625	$12.00	$67,500	148,000
2026-05-04	Eckert Kurt M.	Director	Convert	5,625	—	—	11,563
2026-05-04	Eckert Kurt M.	Director	Sell	5,625	$47.29	$266,006	142,375
2026-05-04	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	28,000	—	—	84,000
2026-05-04	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	28,000	$12.00	$336,000	871,844
2026-05-04	Comly Barbara J.	EVP, GC & Corporate Secretary	Sell	28,000	$47.26	$1,323,280	843,844
2026-04-24	Sites Eric	Insider	Other	0	—	—	0
2026-04-24	Sites Eric	Insider	Other	0	—	—	0
2026-04-24	Sites Eric	Insider	Other	0	—	—	0
2026-04-24	Sites Eric	Insider	Other	0	—	—	0
2026-04-15	Gallagher Thomas P.	Director, Chairman & CEO	Sell	104,124	$43.36	$4,514,817	1,723,275
2026-04-15	Gallagher Thomas P.	Director, Chairman & CEO	Sell	70,001	$43.36	$3,035,243	1,827,399
2026-04-15	Gallagher Thomas P.	Director, Chairman & CEO	Sell	49,900	$43.68	$2,179,632	485,963
2026-04-15	Gallagher Thomas P.	Director, Chairman & CEO	Convert	70,001	—	—	280,000
2026-04-15	Gallagher Thomas P.	Director, Chairman & CEO	Convert	70,001	$12.00	$840,012	1,897,400
2026-04-15	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	29,667	—	—	112,000
2026-04-15	Comly Barbara J.	EVP, GC & Corporate Secretary	Sell	29,667	$43.64	$1,294,668	843,844
2026-04-15	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	29,667	$12.00	$356,004	873,511
2026-04-09	Beckelman John	Director	Convert	8,667	$12.00	$104,004	8,667
2026-04-09	Beckelman John	Director	Convert	8,667	—	—	0
2026-04-08	Brown Shelly	EVP, Chief Strategy Officer	Convert	16,434	—	—	48,000
2026-04-08	Brown Shelly	EVP, Chief Strategy Officer	Sell	16,434	$42.08	$691,543	325,047
2026-04-08	Brown Shelly	EVP, Chief Strategy Officer	Convert	16,434	$12.00	$197,208	341,481
2026-04-08	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	7,572	—	—	0
2026-04-08	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Sell	7,572	$42.02	$318,175	116,221
2026-04-08	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	7,572	$12.00	$90,864	123,793
2026-04-07	Brown Shelly	EVP, Chief Strategy Officer	Sell	900	$42.00	$37,800	324,147
2026-04-07	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Sell	762	$42.00	$32,004	116,221
2026-04-07	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	762	$12.00	$9,144	116,983
2026-04-07	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Sell	4,001	$42.00	$168,042	116,221
2026-04-07	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	4,001	$12.00	$48,012	120,222
2026-04-07	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	4,001	—	—	29,333
2026-04-07	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Convert	762	—	—	7,572
2026-04-06	Brown Shelly	EVP, Chief Strategy Officer	Sell	2,357	$41.33	$97,415	325,047
2026-04-02	Teekell Judson Gray	Director	Sell	2,700	$40.00	$108,000	59,338
2026-03-30	Deitzel Edward	EVP, CRO, CCO MIAX Exchanges	Tax	707	$37.50	$26,513	116,221
2026-03-30	Emmons Lance	EVP and CFO	Tax	8,350	$37.50	$313,125	119,262
2026-03-30	Gallagher Thomas P.	Director, Chairman & CEO	Tax	20,875	$37.50	$782,813	1,827,399
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Tax	1,809	$37.50	$67,838	297,388
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	3,878	—	—	0
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	5,040	—	—	0
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	3,878	$25.78	$99,975	322,364
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	6,195	$16.14	$99,987	318,486
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	6,570	—	—	0
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	8,333	$12.00	$99,996	305,721
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	6,195	—	—	0
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	6,570	$15.22	$99,995	312,291
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	5,040	$19.84	$99,994	327,404
2026-03-30	Brown Shelly	EVP, Chief Strategy Officer	Convert	8,333	—	—	0
2026-03-30	Smollen John	EVP, New Product Development	Tax	362	$37.50	$13,575	170,757
2026-03-30	Comly Barbara J.	EVP, GC & Corporate Secretary	Tax	1,448	$37.50	$54,300	843,844
2026-03-25	Teekell Judson Gray	Director	Sell	300	$40.00	$12,000	62,038
2026-03-25	Sommers Jill E.	Director	Other	0	—	—	0
2026-03-25	Sommers Jill E.	Director	Other	0	—	—	0
2026-03-25	Sommers Jill E.	Director	Other	0	—	—	0
2026-03-23	Brown Shelly	EVP, Chief Strategy Officer	Sell	25,932	$39.33	$1,019,906	299,197
2026-03-19	Eckert Kurt M.	Director	Sell	37,917	$39.00	$1,478,763	142,375
2026-03-19	Eckert Kurt M.	Director	Convert	12,917	$12.00	$155,004	0
2026-03-19	Eckert Kurt M.	Director	Convert	12,917	$12.00	$155,004	180,292
2026-03-17	Schafer Douglas M. JR	EVP and CIO	Convert	48,000	—	—	102,000
2026-03-17	Schafer Douglas M. JR	EVP and CIO	Sell	48,000	$39.74	$1,907,520	396,681
2026-03-17	Schafer Douglas M. JR	EVP and CIO	Convert	48,000	$12.00	$576,000	444,681
2026-03-09	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	8,333	$12.00	$99,996	820,293
2026-03-09	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	8,333	—	—	0
2026-03-09	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	16,666	$12.00	$199,992	845,292
2026-03-09	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	8,333	$12.00	$99,996	828,626
2026-03-09	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	16,666	—	—	0
2026-03-09	Comly Barbara J.	EVP, GC & Corporate Secretary	Convert	8,333	—	—	0
2026-03-05	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Other	2,500	—	—	2,500
2026-03-05	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Other	10,000	—	—	10,000
2026-03-05	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Buy	7,200	$43.08	$310,176	4,633,842
2026-03-05	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Other	7,500	—	—	7,500
2026-03-05	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Other	14,331	—	—	14,331
2026-03-04	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Other	14,331	—	—	14,331
2026-03-04	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Other	2,500	—	—	2,500
2026-03-04	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Other	10,000	—	—	10,000
2026-03-04	STAHL MURRAY	Director, CEO and CIO, 10% Owner	Buy	7,200	$43.38	$312,336	4,696,666