By CapitalSnitch Research Desk · updated Oct 11, 2026 · data from SEC filings and official Congress disclosures
MIAX insiders were on both sides of the trade this year. Buys came to roughly $1 million (two buyers), sales to $81.6 million (12 sellers).
The largest purchase came from HORIZON KINETICS ASSET MANAGEMENT LLC (Director), about $312,000.
Members of Congress reported 1 trade in MIAX over the past two years (one member). Zooming out by quarter: 3 quarters in a row of net selling by insiders. Insiders bought in 3 of the last 7 full quarters. On the institutional side, 205 funds reported holding MIAX at the end of Q2 2026, and more funds bought than sold.
Are insiders buying or selling MIAX stock?
In the last 12 months Miami International Holdings, Inc. insiders made open-market purchases worth about $1 million and sales worth about $81.6 million. Data comes from SEC Form 4 filings, updated every 30 minutes on CapitalSnitch.
When was the last insider trade in MIAX?
The most recent open-market insider trade in MIAX was filed on 2026-10-06.
How many institutions own MIAX?
205 investment managers reported holding MIAX in SEC Form 13F filings for Q2 2026.
Has any member of Congress traded MIAX?
Yes. Members of Congress reported 1 trades in MIAX over the past two years. The full list is free on CapitalSnitch.
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Public-record data for research and education, not investment advice. Insider sales are often pre-planned (10b5-1).
Congress data: Data derived from public disclosures filed under the Ethics in Government Act and the STOCK Act, republished free for public transparency and news reporting. Disclosures may lag the trade by 45 days or more and show amounts only as ranges. This data may not be used for credit rating, loan underwriting, solicitation of money (political, charitable or other), direct-mail or commercial targeting (5 U.S.C. 13107).