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ACM Research, Inc. (NASDAQ:ACMR)
US · Delayed Price · Currency is USD
Technology · Semiconductors
50.96+0.41 (+0.81%)
Insider Score
––Not scored
ACMR Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
ACMR Stock Insider Trading Activity
ACMR stock’s insider trading shows 22 sales on the open market for an estimated $16.95M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Wang David H Director | Sell | 1,100 | $77.59 | $85.35K | 0.1% | 802,708 | Sep 9, 2026 | — | Form 4 |
| Wang David H Director | Option exercise | 70,000 | $1.00 | $70.00K | 8.7% | 872,708 | Sep 9, 2026 | — | Form 4 |
| Wang David H Director | Sell | 33,493 | $73.80 | $2.47M | 3.8% | 839,215 | Sep 9, 2026 | — | Form 4 |
| Wang David H Director | Sell | 18,934 | $74.67 | $1.41M | 2.3% | 820,281 | Sep 9, 2026 | — | Form 4 |
| Wang David H Director | Sell | 11,666 | $75.58 | $881.72K | 1.4% | 808,615 | Sep 9, 2026 | — | Form 4 |
| Wang David H Director | Sell | 4,807 | $76.73 | $368.84K | 0.6% | 803,808 | Sep 9, 2026 | — | Form 4 |
| Wang David H Director | Sell | 4,803 | $75.99 | $364.98K | 0.6% | 867,905 | Sep 8, 2026 | — | Form 4 |
| Wang David H Director | Sell | 51,374 | $77.15 | $3.96M | 5.9% | 816,531 | Sep 8, 2026 | — | Form 4 |
| Wang David H Director | Sell | 12,323 | $78.08 | $962.18K | 1.5% | 804,208 | Sep 8, 2026 | — | Form 4 |
| Wang David H Director | Sell | 1,500 | $78.57 | $117.86K | 0.2% | 802,708 | Sep 8, 2026 | — | Form 4 |
| Wang David H Director | Option exercise | 70,000 | $1.00 | $70.00K | 8.7% | 872,708 | Sep 8, 2026 | — | Form 4 |
| McKechnie Mark Other | Option exercise | 30,199 | $19.49 | $588.58K | 3355% | 31,099 | Aug 20, 2026 | — | Form 4 |
| McKechnie Mark Other | Sell | 13,625 | $76.34 | $1.04M | 24.3% | 42,474 | Aug 20, 2026 | — | Form 4 |
| McKechnie Mark Other | Sell | 30,365 | $77.45 | $2.35M | 71.5% | 12,109 | Aug 20, 2026 | — | Form 4 |
| McKechnie Mark Other | Sell | 11,209 | $77.89 | $873.07K | 92.6% | 900 | Aug 20, 2026 | — | Form 4 |
| McKechnie Mark Other | Option exercise | 25,000 | $13.89 | $347.25K | 80.4% | 56,099 | Aug 20, 2026 | — | Form 4 |
| Dun Haiping Director | Sell | 1,200 | $80.29 | $96.35K | 24.0% | 3,800 | Aug 18, 2026 | — | Form 4 |
| Dun Haiping Director | Sell | 3,400 | $81.31 | $276.45K | 89.5% | 400 | Aug 18, 2026 | — | Form 4 |
| Dun Haiping Director | Sell | 400 | $82.17 | $32.87K | 100% | 0 | Aug 18, 2026 | — | Form 4 |
| Dun Haiping Director | Option exercise | 5,000 | $5.60 | $28.00K | New | 5,000 | Aug 18, 2026 | — | Form 4 |
| Cheav Sotheara Other | Sell | 400 | $84.01 | $33.60K | 0.4% | 101,649 | Jun 5, 2026 | — | Form 4 |
| Cheav Sotheara Other | Option exercise | 5,399 | $13.89 | $74.99K | 5.4% | 105,401 | Jun 5, 2026 | — | Form 4 |
| Cheav Sotheara Other | Sell | 2,384 | $81.73 | $194.84K | 2.3% | 103,017 | Jun 5, 2026 | — | Form 4 |
| Cheav Sotheara Other | Sell | 968 | $82.61 | $79.97K | 0.9% | 102,049 | Jun 5, 2026 | — | Form 4 |
| Cheav Sotheara Other | Sell | 1,647 | $85.41 | $140.67K | 1.6% | 100,002 | Jun 5, 2026 | — | Form 4 |
| Cheav Sotheara Other | Sell | 9,212 | $85.11 | $784.03K | 8.2% | 102,841 | Jun 4, 2026 | — | Form 4 |
| Cheav Sotheara Other | Sell | 2,839 | $85.77 | $243.50K | 2.8% | 100,002 | Jun 4, 2026 | — | Form 4 |
| Wang David H Director | Option exercise | 40,002 | $1.00 | $40.00K | 5.0% | 842,710 | Jun 4, 2026 | — | Form 4 |
| Wang David H Director | Sell | 2,060 | $83.86 | $172.75K | 0.2% | 840,650 | Jun 4, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Option exercise (M) — Exercise or conversion of an exempt derivative
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.