Company · Ownership research

ACM Research, Inc. ACMR

CIK 0001680062

Form 4 transactions dated Nov 1, 2023 to Nov 8, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 48 rows; the complete set is available through the API.

Insider filings on file run through Sep 10, 2026.

Insider purchases & sales

Purchased: $0.00
Sold: $146.61M

Nov 1, 2023 – Sep 10, 2026
Available records · partial months are marked ·

202610 of 19 preview events

Date	Insider	Activity	Trade value (USD)	% of prior holding
Sep 9, 2026	Wang David H See Remarks · Director · 10% owner	Sale10b5-1 footnote	$5.22M 70,000 shares sold	8.02% sold Direct holding	▾
Sep 8, 2026	Wang David H See Remarks · Director · 10% owner	Sale10b5-1 footnote	$5.41M 70,000 shares sold	8.02% sold Direct holding	▾
Aug 20, 2026	McKechnie Mark See Remarks	Sale10b5-1 footnote	$4.26M 55,199 shares sold	98.40% sold Direct holding	▾
Aug 18, 2026	Dun Haiping Director	Sale10b5-1 footnote	$405.67K 5,000 shares sold	100.00% sold Direct holding	▾
Jun 5, 2026	Cheav Sotheara See remarks	Sale10b5-1 footnote	$449.09K 5,399 shares sold	5.12% sold Direct holding	▾
Jun 4, 2026	Cheav Sotheara See remarks	Sale10b5-1 footnote	$1.14M 13,351 shares sold	11.78% sold Direct holding	▾
Jun 4, 2026	Wang David H See Remarks · Director · 10% owner	Sale10b5-1 footnote	$3.43M 40,002 shares sold	4.75% sold Direct holding	▾
Jun 3, 2026	Wang David H See Remarks · Director · 10% owner	Sale10b5-1 footnote	$5.40M 60,000 shares sold	6.95% sold Direct holding	▾
May 19, 2026	Dun Haiping Director	Sale10b5-1 footnote	$331.11K 5,000 shares sold	100.00% sold Direct holding	▾
Apr 17, 2026	Pappis Charles C Director	Sale10b5-1 footnote	$260.00K 5,000 shares sold	100.00% sold Direct holding	▾

Showing 19 / 19 record groups in 2026. The complete set is available through the API.

ACM Research, Inc. · ACMR

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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 19 of 19 purchase / sale groups and 30 of 48 other groups; the totals and the monthly series cover the whole window.

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{"action":"list","ticker":"ACMR","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. Share totals are on today's split-adjusted basis. 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.