What SEC filings does ACM Research, Inc. submit to the SEC?

ACM Research, Inc. (ACMR) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about ACMR?

A Form 4 for ACMR discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from ACM Research, Inc.?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for ACMR?

The 10-K is ACM Research, Inc.'s annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all ACMR SEC filings directly on EDGAR?

You can view all historical ACM Research, Inc. filings on the SEC EDGAR company page for ACMR. Each filing card on this page links directly to the original SEC document.

How often does ACM Research, Inc. file with the SEC?

ACM Research, Inc. files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling ACMR shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

ACMR SEC Filing News — ACM Research, Inc.

Latest SEC filings for ACM Research, Inc. (ACMR) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-30.

ACM Research, Inc., together with its subsidiaries, develops, manufactures, and sells capital equipment in Mainland China and internationally. It also develops, manufactures, and sells a range of packaging tools to wafer assembly and packaging customers. The company provides wet cleaning equipment for front end production processes; electrochemical plating, furnace, PECVD, and track platforms; Space Alternated Phase Shift, technology for flat and wafer surfaces; timely energized bubble oscillati…

Sector: Technology Industry: Semiconductor Equipment & Materials Market Cap: $3.7B CIK: 1680062

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for ACMR currently lean bearish. Of the 20 filing records displayed, 5 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

ACMR Filing Activity Snapshot 2026-06-05 — 2026-09-30

Insider Transactions (Form 4)

0 buys vs 5 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$10.63M

Wang David H (Director, See Remarks, 10% Owner) · 2026-09-10

140,000 shares · Form 4

Form 144 Notices

Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 9 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 9 filings in this group are Form 4s for ACM Research, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 9 insider filings shown, the breakdown is 5 open-market sale and 4 compensation award. 5 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×5: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Compensation award ×4: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Form 4 Open-market sale Insider Selling 2026-09-10

ACMR insider Wang David H (Director, See Remarks, 10% Owner) sold 140,000 shares (~$10.63M)

Wang David H, listed as Director, See Remarks, 10% Owner at ACM Research, Inc., reported an open-market sale of 140,000 ACMR shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	70,000	$1.00	$70.0K
`S`	Open-market sale	4,803	$75.99	$365.0K
`S`	Open-market sale	51,374	$77.15	$3.96M
`S`	Open-market sale	12,323	$78.08	$962.2K
`S`	Open-market sale	1,500	$78.57	$117.9K
`M`	Option exercise	70,000	$1.00	$70.0K
`S`	Open-market sale	33,493	$73.80	$2.47M
`S`	Open-market sale	18,934	$74.67	$1.41M
`S`	Open-market sale	11,666	$75.58	$881.7K
`S`	Open-market sale	4,807	$76.73	$368.8K
`S`	Open-market sale	1,100	$77.59	$85.3K
`M`	Option exercise derivative · Stock Option	70,000	—	—
`M`	Option exercise derivative · Stock Option	70,000	—	—

Filing: Form 4 (Insider Transaction) Insider: Wang David H (Director, See Remarks, 10% Owner) Shares: 140,000 Est. Value: $10.63M

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-26

ACMR insider Form 4 filed for equity award, exercise, or tax withholding

Pappis Charles C (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Stock Option	6,400	—	—
`A`	Compensation award derivative · Restricted Stock Units	728	—	—

Filing: Form 4 (Insider Transaction) Insider: Pappis Charles C (Director)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-26

ACMR insider Form 4 filed for equity award, exercise, or tax withholding

Liu Tracy (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Stock Option	6,400	—	—
`A`	Compensation award derivative · Restricted Stock Units	728	—	—

Filing: Form 4 (Insider Transaction) Insider: Liu Tracy (Director)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-26

ACMR insider Form 4 filed for equity award, exercise, or tax withholding

Dun Haiping (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Stock Option	6,400	—	—
`A`	Compensation award derivative · Restricted Stock Units	728	—	—

Filing: Form 4 (Insider Transaction) Insider: Dun Haiping (Director)

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-21

ACMR insider McKechnie Mark (See Remarks) sold 55,199 shares (~$4.26M)

McKechnie Mark, listed as See Remarks at ACM Research, Inc., reported an open-market sale of 55,199 ACMR shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	30,199	$19.49	$588.6K
`M`	Option exercise	25,000	$13.89	$347.2K
`S`	Open-market sale	13,625	$76.34	$1.04M
`S`	Open-market sale	30,365	$77.45	$2.35M
`S`	Open-market sale	11,209	$77.89	$873.1K
`M`	Option exercise derivative · Stock Option	30,199	—	—
`M`	Option exercise derivative · Stock Option	25,000	—	—

Filing: Form 4 (Insider Transaction) Insider: McKechnie Mark (See Remarks) Shares: 55,199 Est. Value: $4.26M

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-20

ACMR insider Dun Haiping (Director) sold 5,000 shares (~$405.7K)

Dun Haiping, listed as Director at ACM Research, Inc., reported an open-market sale of 5,000 ACMR shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	5,000	$5.60	$28.0K
`S`	Open-market sale	1,200	$80.29	$96.3K
`S`	Open-market sale	3,400	$81.31	$276.5K
`S`	Open-market sale	400	$82.17	$32.9K
`M`	Option exercise derivative · Stock Option	5,000	—	—

Filing: Form 4 (Insider Transaction) Insider: Dun Haiping (Director) Shares: 5,000 Est. Value: $405.7K

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-07-06

ACMR insider Form 4 filed for equity award, exercise, or tax withholding

Wang David H (Director, See Remarks, 10% Owner) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Restricted Stock Units	6,208	—	—

Filing: Form 4 (Insider Transaction) Insider: Wang David H (Director, See Remarks, 10% Owner)

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-06-05

ACMR insider Cheav Sotheara (See remarks) sold 18,750 shares (~$1.59M)

Cheav Sotheara, listed as See remarks at ACM Research, Inc., reported an open-market sale of 18,750 ACMR shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	13,351	$13.89	$185.4K
`S`	Open-market sale	1,300	$84.08	$109.3K
`S`	Open-market sale	9,212	$85.11	$784.0K
`S`	Open-market sale	2,839	$85.77	$243.5K
`M`	Option exercise	5,399	$13.89	$75.0K
`S`	Open-market sale	2,384	$81.73	$194.8K
`S`	Open-market sale	968	$82.61	$80.0K
`S`	Open-market sale	400	$84.01	$33.6K
`S`	Open-market sale	1,647	$85.41	$140.7K
`M`	Option exercise derivative · Stock Option	13,351	—	—
`M`	Option exercise derivative · Stock Option	5,399	—	—

Filing: Form 4 (Insider Transaction) Insider: Cheav Sotheara (See remarks) Shares: 18,750 Est. Value: $1.59M

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-06-05

ACMR insider Wang David H (Director, See Remarks, 10% Owner) sold 100,002 shares (~$8.84M)

Wang David H, listed as Director, See Remarks, 10% Owner at ACM Research, Inc., reported an open-market sale of 100,002 ACMR shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	60,000	$1.00	$60.0K
`S`	Open-market sale	4,300	$87.57	$376.6K
`S`	Open-market sale	6,295	$88.98	$560.1K
`S`	Open-market sale	32,450	$89.84	$2.92M
`S`	Open-market sale	9,925	$90.78	$901.0K
`S`	Open-market sale	5,843	$92.38	$539.8K
`S`	Open-market sale	1,187	$93.04	$110.4K
`M`	Option exercise	40,002	$1.00	$40.0K
`S`	Open-market sale	2,060	$83.86	$172.8K
`S`	Open-market sale	17,543	$85.11	$1.49M
`S`	Open-market sale	10,992	$86.07	$946.1K
`S`	Open-market sale	8,581	$87.13	$747.7K
`S`	Open-market sale	826	$87.91	$72.6K
`M`	Option exercise derivative · Stock Option	60,000	—	—
`M`	Option exercise derivative · Stock Option	40,002	—	—

Filing: Form 4 (Insider Transaction) Insider: Wang David H (Director, See Remarks, 10% Owner) Shares: 100,002 Est. Value: $8.84M

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 5 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. ACM Research, Inc. has 5 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-09-09