MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) Institutional Ownership and Insiders Activity

MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX) is widely held by institutional investors, with 205 firms reporting positions valued at approximately $2.63B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Horizon Kinetics Asset Management Llc is the largest disclosed holder, reporting approximately $291.42M in MIAX holdings in its latest filing.

Recent insider activity includes 4 tracked Form 4 transactions over the last three months, reflecting ongoing executive and director trading activity.