SEC Form 4 reporting owner

Dun Haiping

Dun Haiping has filed 14 Form 4 transactions reported between March 9, 2026 and August 18, 2026, as a reporting owner of ACM Research, Inc..

Name as filed: Dun Haiping

Open-market buys, 24 mo

None

reported

Open-market sales, 24 mo

$954K

9 lines

Companies

with Form 4 filings

Latest transaction

Aug 18, 2026

transaction date

Roles and reported holdings

ACMRACM Research, Inc.
Mar 9, 2026 – Aug 18, 2026
Reporting owner
Held directly0 sh as of Aug 18, 2026 · Form 4
24 months: $954K sold

Transaction history

All 14 reported transactions, newest first. Every row links to the Form 4 on SEC EDGAR.

Date	Company	Type	Shares	Price	Value	Owned after	Filing
Aug 18, 2026	ACMR	Open-market saleCode S · direct	400	$82.17	$33K@ $82.17	0	Form 4
Aug 18, 2026	ACMR	Open-market saleCode S · direct	3,400	$81.31	$276K@ $81.31	400	Form 4
Aug 18, 2026	ACMR	Open-market saleCode S · direct	1,200	$80.29	$96K@ $80.29	3,800	Form 4
Aug 18, 2026	ACMR	Option exerciseCode M · direct	5,000	$5.60	$28K@ $5.60	5,000	Form 4
Aug 12, 2026	ACMR	Grant or awardCode A · direct	728	—	—	728	Form 4
Aug 12, 2026	ACMR	Grant or awardCode A · direct	6,400	—	—	6,400	Form 4
May 19, 2026	ACMR	Open-market saleCode S · direct	1,858	$67.54	$125K@ $67.54	0	Form 4
May 19, 2026	ACMR	Open-market saleCode S · direct	1,309	$67.21	$88K@ $67.21	1,858	Form 4
May 19, 2026	ACMR	Open-market saleCode S · direct	500	$65.09	$33K@ $65.09	3,167	Form 4
May 19, 2026	ACMR	Open-market saleCode S · direct	1,333	$63.84	$85K@ $63.84	3,667	Form 4
May 19, 2026	ACMR	Option exerciseCode M · direct	5,000	$5.60	$28K@ $5.60	5,000	Form 4
Mar 9, 2026	ACMR	Open-market saleCode S · direct	900	$43.94	$40K@ $43.94	0	Form 4
Mar 9, 2026	ACMR	Open-market saleCode S · direct	4,100	$43.37	$178K@ $43.37	900	Form 4
Mar 9, 2026	ACMR	Option exerciseCode M · direct	5,000	$5.60	$28K@ $5.60	5,000	Form 4

How this page is built

Every row comes from a Form 4 filed with the SEC, which officers, directors and holders of more than 10% of a company’s stock must file within two business days of a trade. Transactions are grouped by the reporting owner’s name as filed (spacing, capitals and punctuation ignored); two different people filing under an identical name would appear together, and one person filing under two spellings appears on two pages.

Open-market totals count code P purchases and code S sales over the last 24 months. The same trade reported on more than one filing is counted once; when another owner (for example a fund and its general partner) reports the identical trade, they are listed beside it. Holdings are the shares owned after the latest purchase, sale, gift or tax-withholding line, shown separately for direct and indirect ownership; an indirect figure is one holding line, not a total across every trust or entity.

This page describes what was filed with the SEC; it is not investment advice or a recommendation to buy or sell any security.