Company · MIAX
Miami International Holdings, Inc.
Name as listed on its exchange; filed with the SEC as MIAMI INTERNATIONAL HOLDINGS, INC.
Nasdaq's symbol directory lists MIAX on the New York Stock Exchange as “Miami International Holdings, Inc. Common Stock”.
In the 12 months to Nov 8, 2026: insiders sold on 36 occasions ($42.7M); 3 planned-sale notices; 2 filings by holders of 5% or more; 1 congressional trade disclosure; 1 company report (Form 8-K, since May 26, 2026).
Insider trades · SEC Form 4
Those inside the hall
Open-market purchases and sales only. Legs one person filed for one day are combined.
Who traded
- Gallagher Thomas P., Chairman & CEO sold $16.3M
- Comly Barbara J., EVP, GC & Corporate Secretary sold $9.4M
- Schafer Douglas M. JR, EVP and CIO sold $9.4M
- Jayabalan Harish, EVP, CISO and CRO sold $1.8M
- Brown Shelly, EVP, Chief Strategy Officer sold $1.7M
- Emmons Lance, EVP and CFO sold $1.5M
- Deitzel Edward, EVP, CRO, CCO MIAX Exchanges sold $1.4M
- Teekell Judson Gray sold $611K
- Schwarzkopf Cynthia sold $424K
- Eckert Kurt M. sold $255K
Every trade (36)
- SELLComly Barbara J., EVP, GC & Corporate Secretary sold $2.0M
- SELLSchafer Douglas M. JR, EVP and CIO sold $280K
- SELLSchafer Douglas M. JR, EVP and CIO sold $1.4M
- SELLComly Barbara J., EVP, GC & Corporate Secretary sold $819K
- SELLComly Barbara J., EVP, GC & Corporate Secretary sold $431K
- SELLSchafer Douglas M. JR, EVP and CIO sold $280K
- SELLSchafer Douglas M. JR, EVP and CIO sold $1.3M
- SELLBrown Shelly, EVP, Chief Strategy Officer sold $819K
- SELLGallagher Thomas P., Chairman & CEO sold $2.0M
- SELLDeitzel Edward, EVP, CRO, CCO MIAX Exchanges sold $464K
- SELLSchafer Douglas M. JR, EVP and CIO sold $1.9M
- SELLComly Barbara J., EVP, GC & Corporate Secretary sold $1.8M
- SELLTeekell Judson Gray sold $353K
- SELLGallagher Thomas P., Chairman & CEO sold $6.2M
- SELLEmmons Lance, EVP and CFO sold $1.5M
- SELLSchwarzkopf Cynthia sold $214K
- SELLGallagher Thomas P., Chairman & CEO sold $2.2M
- SELLSchafer Douglas M. JR, EVP and CIO sold $2.2M
- SELLComly Barbara J., EVP, GC & Corporate Secretary sold $2.0M
- SELLJayabalan Harish, EVP, CISO and CRO sold $918K
- SELLDeitzel Edward, EVP, CRO, CCO MIAX Exchanges sold $504K
- SELLTeekell Judson Gray sold $137K
- SELLEckert Kurt M. sold $49K
- SELLSchwarzkopf Cynthia sold $210K
- SELLGallagher Thomas P., Chairman & CEO sold $3.0M
- SELLComly Barbara J., EVP, GC & Corporate Secretary sold $1.2M
- SELLGallagher Thomas P., Chairman & CEO sold $1.2M
- SELLGallagher Thomas P., Chairman & CEO sold $1.8M
- SELLJayabalan Harish, EVP, CISO and CRO sold $842K
- SELLBrown Shelly, EVP, Chief Strategy Officer sold $674K
- SELLDeitzel Edward, EVP, CRO, CCO MIAX Exchanges sold $462K
- SELLSchafer Douglas M. JR, EVP and CIO sold $2.0M
- SELLComly Barbara J., EVP, GC & Corporate Secretary sold $1.2M
- SELLEckert Kurt M. sold $207K
- SELLTeekell Judson Gray sold $120K
- SELLBrown Shelly, EVP, Chief Strategy Officer sold $209K
Planned sales · SEC Form 144
Notice given
A Form 144 is filed before an insider sells restricted stock. It states an intent; the sale, if it happens, appears later on a Form 4. Every recent notice
- BARBARA J. COMLY $5.1M
- DOUGLAS M. SCHAFER JR. $4.0M
- SHELLY BROWN $838K
Large holders · SEC Schedules 13D and 13G
Five percent and over
Anyone who comes to hold more than 5% of a company's voting shares must tell the SEC. A Schedule 13D is filed by a holder who may seek to influence the company; a 13G by one who states it is a passive investor. An amendment updates an earlier filing, and a stake reported as 0% means the holder says it has sold all, or nearly all, of its shares. Every recent 13D and 13G
- BlackRock, Inc. 6.2%
- T. Rowe Price Investment Management, Inc. 5.3%
Congress · STOCK Act
The Althing
Periodic transaction reports. Amounts are the ranges members report; the trade date is when it happened, the report can come up to 45 days later.
- Gilbert Cisneros (D-CA31): Purchase $15,001 - $50,000
Company reports · SEC Form 8-K
In its own words
Current reports the company filed with the SEC; most items are due within four business days of the event. Each line lists the report's items by the SEC's own titles; the filing says what happened. Reports collected since May 26, 2026; every 8-K at the SEC.
- Results of operations and financial condition Oct 29, 2026
Sources: SEC EDGAR (Forms 4, 144 and 8-K) and STOCK Act periodic transaction reports. Filings can be late, amended or wrong at the source; see methodology.