MIAX MIAMI INTERNATIONAL HOLDINGS, INC.: institutional ownership and insider trading
222 funds reported holding $2.79B of MIAMI INTERNATIONAL HOLDINGS, INC. in their latest 13F filings; in Q2 2026 funds net bought $826M, with 49 new positions and 39 funds selling out; over the last 12 months insiders bought $723K and sold $76.6M on the open market.
Famous investors holding MIAX
- Two Sigma (Two Sigma Investments): $33.0M, 0.0% of the portfolio
- D. E. Shaw (D. E. Shaw & Co.): $14.3M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $7.03M, 0.0% of the portfolio
- Ken Griffin (Citadel Advisors): $6.66M, 0.0% of the portfolio
Largest institutional holders of MIAX
- HORIZON KINETICS ASSET MANAGEMENT LLC — $291M
- BlackRock, Inc. (BLK) — $188M
- T. Rowe Price Investment Management, Inc. — $187M
- SUSQUEHANNA INTERNATIONAL GROUP, LLP — $141M
- VANGUARD PORTFOLIO MANAGEMENT LLC — $141M
- VANGUARD CAPITAL MANAGEMENT LLC — $118M
- VANGUARD GROUP INC — $85.6M
- Invesco Ltd. (IVZ) — $75.1M
- J Digital 6 LLC — $67.2M
- BLAIR WILLIAM & CO/IL — $65.8M
Recent MIAX insider trades
- Oct 2, 2026: Schafer Douglas M. JR sold 40,000 shares ($1.33M)
- Sep 16, 2026: Brown Shelly sold 21,217 shares ($819K)
- Sep 3, 2026: Gallagher Thomas P. sold 47,000 shares ($1.99M)
- Sep 3, 2026: Deitzel Edward sold 11,000 shares ($464K)
Members of Congress trading MIAX
- Mar 20, 2026: Gilbert Ray Cisneros, Jr. bought $15.0K–$50.0K
5%+ owners
- HORIZON KINETICS ASSET MANAGEMENT LLC: 7.8% (Schedule 13D/A, filed May 21, 2026)
- T. Rowe Price Investment Management, Inc.: 5.3% (Schedule 13G, filed Aug 14, 2026)
- BlackRock, Inc.: 5.1% (Schedule 13G, filed Jul 29, 2026)