Company · Ownership research

MIAMI INTERNATIONAL HOLDINGS, INC. MIAX

CIK 0001438472

Form 4 transactions dated Sep 1, 2023 to Sep 25, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 64 rows; the complete set is available through the API.

Insider filings on file run through 2026-09-11.

Insider purchases & sales

Purchased: $2.83M
Sold: $74.41M

Sep 1, 2023 – Sep 11, 2026
Available records · partial months are marked ·

202610 of 30 preview events · 64 available in 2026

Date	Insider	Activity	Trade value (USD)	% of prior holding
2026-09-03	Deitzel Edward EVP, CRO, CCO MIAX Exchanges	Sale10b5-1 footnote	$464.31K 11,000 shares sold	8.42% sold Direct holding	▾
2026-09-03	Gallagher Thomas P. Chairman & CEO · Director	Sale10b5-1 footnote	$1.99M 47,000 shares sold	3.20% sold LLC holding	▾
2026-09-02	Comly Barbara J. EVP, GC & Corporate Secretary	Sale10b5-1 footnote	$1.80M 44,445 shares sold	5.03% sold Direct holding	▾
2026-09-02	Schafer Douglas M. JR EVP and CIO	Sale10b5-1 footnote	$1.94M 48,000 shares sold	11.02% sold Direct holding	▾
2026-09-02	Teekell Judson Gray Director	Sale	$230.56K 5,545 shares sold	6.41% sold Indirect holding	▾
2026-09-02	Teekell Judson Gray Director	Sale10b5-1 footnote	$122.67K 3,000 shares sold	4.15% sold Direct holding	▾
2026-08-19	Gallagher Thomas P. Chairman & CEO · Director	Sale10b5-1 footnote	$6.16M 149,700 shares sold	9.52% sold LLC holding	▾
2026-08-17	Schwarzkopf Cynthia Director	Sale10b5-1 footnote	$214.25K 5,000 shares sold	5.35% sold Direct holding	▾
2026-08-17	Emmons Lance EVP and CFO	Sale10b5-1 footnote	$1.50M 35,000 shares sold	28.80% sold Direct holding	▾
2026-08-04	Comly Barbara J. EVP, GC & Corporate Secretary	Sale10b5-1 footnote	$2.03M 44,445 shares sold	4.79% sold Direct holding	▾

Showing 30 / 64 record groups in 2026. The complete set is available through the API.

MIAMI INTERNATIONAL HOLDINGS, INC. · MIAX

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 30 of 64 purchase / sale groups and 30 of 210 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"MIAX","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.