As of the latest Form 4 filed Jun 5, 2026.
What Acm Research Inc insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 61 most recent filings for ACMR.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-05 | 2026-06-05 | Cheav Sotheara See remarks | SSale | −1.65K | $85.41 | $141K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-05 | Cheav Sotheara, See remarks | SSale | −400.00 | $84.01 | $33.6K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-05 | Cheav Sotheara, See remarks | SSale | −968.00 | $82.61 | $80.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-05 | Cheav Sotheara, See remarks | SSale | −2.38K | $81.73 | $195K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-05 | Cheav Sotheara, See remarks | MExercise | +5.40K | $13.89 | $75.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Cheav Sotheara, See remarks | SSale | −2.84K | $85.77 | $244K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Cheav Sotheara, See remarks | SSale | −9.21K | $85.11 | $784K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Cheav Sotheara, See remarks | SSale | −1.30K | $84.08 | $109K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Cheav Sotheara, See remarks | MExercise | +13.4K | $13.89 | $185K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Wang David H See Remarks | SSale | −826.00 | $87.91 | $72.6K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Wang David H, See Remarks | SSale | −8.58K | $87.13 | $748K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Wang David H, See Remarks | SSale | −11.0K | $86.07 | $946K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Wang David H, See Remarks | SSale | −17.5K | $85.11 | $1.49M | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Wang David H, See Remarks | SSale | −2.06K | $83.86 | $173K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-04 | Wang David H, See Remarks | MExercise | +40.0K | $1.00 | $40.0K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Wang David H, See Remarks | SSale | −1.19K | $93.04 | $110K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Wang David H, See Remarks | SSale | −5.84K | $92.38 | $540K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Wang David H, See Remarks | SSale | −9.93K | $90.78 | $901K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Wang David H, See Remarks | SSale | −32.5K | $89.84 | $2.92M | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Wang David H, See Remarks | SSale | −6.29K | $88.98 | $560K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Wang David H, See Remarks | SSale | −4.30K | $87.57 | $377K | Yes (planned) | Form 4 ↗ |
| 2026-06-05 | 2026-06-03 | Wang David H, See Remarks | MExercise | +60.0K | $1.00 | $60.0K | Yes (planned) | Form 4 ↗ |
| 2026-05-21 | 2026-05-19 | Dun Haiping Director | SSale | −1.86K | $67.54 | $125K | Yes (planned) | Form 4 ↗ |
| 2026-05-21 | 2026-05-19 | Dun Haiping, Director | SSale | −1.31K | $67.21 | $88.0K | Yes (planned) | Form 4 ↗ |
| 2026-05-21 | 2026-05-19 | Dun Haiping, Director | SSale | −500.00 | $65.09 | $32.5K | Yes (planned) | Form 4 ↗ |
| 2026-05-21 | 2026-05-19 | Dun Haiping, Director | SSale | −1.33K | $63.84 | $85.1K | Yes (planned) | Form 4 ↗ |
| 2026-05-21 | 2026-05-19 | Dun Haiping, Director | MExercise | +5.00K | $5.60 | $28.0K | Yes (planned) | Form 4 ↗ |
| 2026-04-21 | 2026-04-17 | Pappis Charles C Director | SSale | −5.00K | $52.00 | $260K | Yes (planned) | Form 4 ↗ |
| 2026-04-21 | 2026-04-17 | Pappis Charles C, Director | MExercise | +5.00K | $29.18 | $146K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark See Remarks | SSale | −564.00 | $46.57 | $26.3K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark, See Remarks | SSale | −29.3K | $45.74 | $1.34M | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark, See Remarks | SSale | −8.64K | $44.94 | $388K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark, See Remarks | MExercise | +38.6K | $19.49 | $751K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark, See Remarks | SSale | −982.00 | $46.55 | $45.7K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark, See Remarks | SSale | −47.1K | $45.74 | $2.15M | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark, See Remarks | SSale | −11.9K | $44.89 | $535K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | McKechnie Mark, See Remarks | MExercise | +60.0K | $13.89 | $833K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | Wang David H See Remarks | SSale | −702.00 | $46.57 | $32.7K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | Wang David H, See Remarks | SSale | −38.7K | $45.74 | $1.77M | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | Wang David H, See Remarks | SSale | −10.6K | $44.92 | $474K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | Wang David H, See Remarks | MExercise | +50.0K | $1.00 | $50.0K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | Wang David H, See Remarks | SSale | −4.63K | $48.34 | $224K | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | Wang David H, See Remarks | SSale | −55.4K | $47.89 | $2.65M | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | Wang David H, See Remarks | MExercise | +60.0K | $1.00 | $60.0K | Yes (planned) | Form 4 ↗ |
| 2026-03-12 | 2026-03-11 | Liu Tracy Director | SSale | −3.38K | $48.25 | $163K | Yes (planned) | Form 4 ↗ |
| 2026-03-12 | 2026-03-11 | Liu Tracy, Director | SSale | −11.6K | $47.81 | $556K | Yes (planned) | Form 4 ↗ |
| 2026-03-12 | 2026-03-11 | Liu Tracy, Director | MExercise | +15.0K | $1.00 | $15.0K | Yes (planned) | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Liu Tracy, Director | SSale | −12.8K | $48.19 | $616K | Yes (planned) | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Liu Tracy, Director | SSale | −32.2K | $47.06 | $1.52M | Yes (planned) | Form 4 ↗ |
| 2026-03-12 | 2026-03-10 | Liu Tracy, Director | MExercise | +45.0K | $1.00 | $45.0K | Yes (planned) | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | Dun Haiping Director | SSale | −900.00 | $43.94 | $39.5K | Yes (planned) | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | Dun Haiping, Director | SSale | −4.10K | $43.37 | $178K | Yes (planned) | Form 4 ↗ |
| 2026-03-11 | 2026-03-09 | Dun Haiping, Director | MExercise | +5.00K | $5.60 | $28.0K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-06 | Feng Lisa See remarks | SSale | −200.00 | $46.58 | $9.32K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-06 | Feng Lisa, See remarks | SSale | −14.8K | $46.07 | $682K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-06 | Feng Lisa, See remarks | MExercise | +15.0K | $4.55 | $68.3K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Pappis Charles C Director | SSale | −5.00K | $50.09 | $250K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Pappis Charles C, Director | MExercise | +5.00K | $29.18 | $146K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Feng Lisa See remarks | SSale | −6.95K | $50.24 | $349K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Feng Lisa, See remarks | SSale | −8.05K | $49.81 | $401K | Yes (planned) | Form 4 ↗ |
| 2026-03-09 | 2026-03-05 | Feng Lisa, See remarks | MExercise | +15.0K | $4.55 | $68.3K | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also ACMR’s full analysis or the market-wide insider trading feed. The tabs above jump to ACMR’s other SEC data.
Source: SEC Form 4 filings for ACMR, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
Research and education only — not financial advice. TENKis not a registered investment adviser or broker-dealer and gives no personalized advice. Every call is impersonal — identical for all users, generated on a schedule from SEC filings plus a delayed/third-party price feed — may be wrong or out of date, and is not a recommendation to buy or sell any security. The operator and an affiliated trading operation may hold or trade the securities TENK rates; see Disclosures. Past performance does not guarantee future results. Do your own research.