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About ACM Research, Inc. (ACMR)
ACM Research, Inc. is an SEC registrant, filing under CIK 0001680062, classified as special industry machinery, nec. We track it alongside the rest of the Industrials sector.
ACMR Form 4 activity by transaction type, last 90 days
| Form 4 transaction type | Transactions | Shares | Total value |
|---|---|---|---|
| Open-market sale | 15 | 200,199 | $15.30M |
| Grant or award | 6 | 21,384 | |
| Option exercise | 10 | 400,398 |
Dollar totals cover purchases and sales only (codes P and S). Grants, option exercises, gifts and tax withholding are counted in shares, because none of them is a trade at a market price.
ACMR insider transactions (Form 4)
4047 Form 4 filings on record, the earliest from Oct 3, 2024, newest first. Filing history page 2 of 2.
| Traded | Insider | Transaction | Security | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Haiping Dun | Grant or award | Stock Option | 20,000 | $0.00 | - | |
| Tracy Liu | Grant or award | Stock Option | 20,000 | $0.00 | - | |
| Charles C. Pappis | Grant or award | Stock Option | 20,000 | $0.00 | - | |
| Tracy Liu | Option exercise | Class A Common Stock | 15,000 | $1.00 | $15K | |
| Tracy Liu | Open-market sale | Class A Common Stock | 15,000 | $30.00 | $450K | |
| Tracy Liu | Option exercise | Stock Option | 15,000 | $0.00 | - | |
| Lisa Feng - Officer | Option exercise | Class A Common Stock | 15,000 | $5.60 | $84K | |
| Lisa Feng - Officer | Open-market sale | Class A Common Stock | 15,000 | $28.00 | $420K | |
| Lisa Feng - Officer | Option exercise | Stock Option | 15,000 | $0.00 | - | |
| Haiping Dun | Open-market sale | Class A Common Stock | 19,058 | $17.43 | $332K | |
| David H. Wang - Officer | Open-market sale | Class A Common Stock | 56,250 | $17.44 | $981K | |
| David H. Wang - Officer | Open-market sale | Class A Common Stock | 46,766 | $17.80 | $832K | |
| David H. Wang - Officer | Open-market sale | Class A Common Stock | 9,484 | $18.31 | $174K | |
| Haiping Dun | Open-market sale | Class A Common Stock | 15,000 | $19.12 | $287K | |
| David H. Wang - Officer | Open-market sale | Class A Common Stock | 56,250 | $19.08 | $1.07M | |
| Haiping Dun | Option exercise | Class A Common Stock | 35,000 | $0.50 | $18K | |
| Haiping Dun | Tax withholding / forfeiture | Class A Common Stock | 942 | $18.59 | $18K | |
| Haiping Dun | Option exercise | Stock Option | 35,000 | $0.00 | - | |
| David H. Wang - Officer | Option exercise | Class A Common Stock | 270,000 | $0.50 | $135K | |
| David H. Wang - Officer | Tax withholding / forfeiture | Class A Common Stock | 7,262 | $18.59 | $135K | |
| David H. Wang - Officer | Option exercise | Stock Option | 270,000 | $0.00 | - | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 570,735 | $21.52 | $12.28M | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 129,265 | $20.94 | $2.71M | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 100,514 | $25.36 | $2.55M | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 1,481 | $25.02 | $37K | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 173,005 | $23.32 | $4.03M | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 90,396 | $21.13 | $1.91M | |
| Xiao Xing | Open-market sale | Class A Common Stock | 580,873 | $21.33 | $12.39M | |
| Xiao Xing | Open-market sale | Class A Common Stock | 119,127 | $21.79 | $2.60M | |
| Xiao Xing | Open-market sale | Class A Common Stock | 173,005 | $23.32 | $4.03M | |
| Xiao Xing | Open-market sale | Class A Common Stock | 101,018 | $25.35 | $2.56M | |
| Xiao Xing | Open-market sale | Class A Common Stock | 977 | $26.01 | $25K | |
| Xiao Xing | Open-market sale | Class A Common Stock | 90,396 | $21.13 | $1.91M | |
| Mark McKechnie - Officer | Option exercise | Class A Common Stock | 16,516 | $5.60 | $92K | |
| Mark McKechnie - Officer | Open-market sale | Class A Common Stock | 16,516 | $22.00 | $363K | |
| Mark McKechnie - Officer | Option exercise | Stock Option | 16,516 | $0.00 | - | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 8,304 | $20.19 | $168K | |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. - 10% Owner | Open-market sale | Class A Common Stock, $0.0001 par value | 26,300 | $20.01 | $526K | |
| Xiao Xing | Open-market sale | Class A Common Stock | 8,304 | $20.19 | $168K | |
| Xiao Xing | Open-market sale | Class A Common Stock | 26,300 | $20.01 | $526K |
Recent ACMR Form 144 notices of proposed sale
3An insider files Form 144 before selling restricted or control stock. It announces a planned sale. If the sale goes ahead, it shows up later on a Form 4.
| Filed | Filer | Relationship | Shares | Market value | Notice |
|---|---|---|---|---|---|
| Wang Hui | Officer, Director, 10% Stockholder | 70,000 | $5.22M | View on EDGAR | |
| Wang Hui | Officer, Director, 10% Stockholder | 70,000 |
ACMR insider trading FAQ
What is the latest insider trade for ACMR?
ACM Research, Inc. (ACMR) had 6 insider filings in the last 90 days, with the most recent on 10 September 2026. The full record for ACMR runs to 47 Form 4 filings, the earliest from 3 October 2024. InsiderAlpha adds new Form 4, Form 144 and 8-K filings as they arrive from SEC EDGAR.
How many insiders are buying ACMR stock?
No insider purchases of ACMR were filed in the last 90 days.
How many insiders are selling ACMR stock?
15 insider sales of ACMR were filed in the last 90 days, totaling $15.30M.
Where can I see ACMR SEC filings (Form 4, 10-K, 10-Q, 8-K)?
This page collects ACMR Form 4 insider transactions, Form 144 sale notices and 8-K filings in one place. Annual 10-K and quarterly 10-Q reports live on the company's SEC EDGAR page.
More Industrials companies with insider activity
Recent insider filings
10The EDGAR links open each original Form 4, so you can check any number on this page against the filing it came from.
- - David H. Wang view on EDGAR
- - Charles C. Pappis view on EDGAR
- - Tracy Liu view on EDGAR
- - Haiping Dun view on EDGAR
- - Mark McKechnie view on EDGAR
- - Haiping Dun view on EDGAR
- - David H. Wang view on EDGAR
- - Sotheara Cheav view on EDGAR
- - David H. Wang view on EDGAR
Related companies with recent insider activity
Learn more
- Insider selling: signal or noise?
- Why most insider sales are routine, and the few patterns worth a second look.
- Form 144 vs Form 4
- A Form 144 announces a planned sale; the Form 4 reports it after it happens.
- Insider activity in Industrials
- Where ACMR's peers are being bought and sold.
- Every recent Form 4
- The market-wide feed, updated as filings arrive from SEC EDGAR.
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- Up to 3 months of ACMR price history
- The daily trading plan of ranked insider buys, on a delay, with the plan archive
