MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) Stock
1 member of Congress disclosed 1 trade in MIAX since 2026: 1 purchase and 0 sales, most recently Gilbert Cisneros (purchase, Mar 20, 2026). 3 of the hedge funds AlphaScala tracks reported MIAX in 13F filings for the quarter ended Jun 30, 2026; the largest reported position is D.E. Shaw's at $13.21M. Company insiders reported 0 open-market buys and 17 sales on SEC Form 4 in the 90 days to Nov 10, 2026.
Which members of Congress traded MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)?
Most recent: Gilbert Cisneros (purchase, Mar 20, 2026); records start Mar 20, 2026.
| Politician | Trade date | Type | Amount |
|---|---|---|---|
| Gil Cisneros D-CA · House | 2026-03-20 | purchase | $15k – $50k |
From STOCK Act periodic transaction reports. House filings as of Nov 9, 2026.
See all MIAX political trades →Which hedge funds own MIAX?
From 13F filings| Fund | Shares Held | Position Value | Change vs prior Q |
|---|---|---|---|
| D.E. Shaw David Shaw | 356K | $13.21M | +11% |
| Marshall Wace | 287K | $10.68M | +134% |
| Millennium Management Israel Englander | 189K | $7.03M | -64% |
13F holdings as of Jun 30, 2026
Explore all tracked funds →Are MIAMI INTERNATIONAL HOLDINGS, INC. insiders buying or selling?
SEC Form 4 filings| Date | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| Nov 4, 26 | Comly Barbara J. | EVP, GC & Corporate Secretary | SELL | 56.0K | $2.0M |
| Nov 4, 26 | Schafer Douglas M. Jr | EVP and CIO | SELL | 8.0K | $280K |
| Nov 3, 26 | Schafer Douglas M. Jr | EVP and CIO | SELL | 40.0K | $1.4M |
| Nov 2, 26 | Comly Barbara J. | EVP, GC & Corporate Secretary | SELL | 23.3K | $819K |
| Oct 22, 26 | Schafer Douglas M. Jr | EVP and CIO | SELL | 8.0K | $280K |
| Oct 22, 26 | Comly Barbara J. | EVP, GC & Corporate Secretary | SELL | 12.3K | $431K |
| Oct 2, 26 | Schafer Douglas M. Jr | EVP and CIO | SELL | 40.0K | $1.3M |
| Sep 16, 26 | Brown Shelly | EVP, Chief Strategy Officer | SELL | 21.2K | $819K |
| Sep 3, 26 | Gallagher Thomas P. | Chairman & CEO | SELL | 47.0K | $2.0M |
| Sep 3, 26 | Deitzel Edward | EVP, CRO, CCO MIAX Exchanges | SELL | 11.0K | $464K |
SEC Form 4 filings as of Nov 10, 2026
See cluster-buy signals across all tickers →MIAX price chart
Powered by TradingViewWhat does MIAMI INTERNATIONAL HOLDINGS, INC. do?
Miami International Holdings, Inc. is a leading operator and holding company specializing in the development and management of regulated financial markets across multiple asset classes. The company’s expansive portfolio includes U.S.-based exchanges such as Miami International Securities Exchange, MIAX Pearl, MIAX Emerald, and MIAX Sapphire, each delivering advanced electronic trading platforms focused on options and equities. Miami International Holdings also owns and operates MIAX Futures, which provides trading and clearing services for futures and options, as well as international platforms like the Bermuda Stock Exchange and The International Stock Exchange. Through its proprietary, high-performance trading technology, the company ensures reliability, speed, and efficiency in market operations. Miami International Holdings plays a pivotal role in the infrastructure of both domestic and international capital markets, facilitating trading in options, equities, futures, and structured products for a diverse, global clientele. Its operations contribute significantly to financial market innovation, efficiency, and transparency, supporting institutional and professional market participants worldwide.