ACM RESEARCH CLASS A INC (ACMR) — insider trading
Information Technology · NASDAQ
ACM RESEARCH CLASS A INC (ACMR) has 79 reported SEC Form 4 insider transactions in our data, including 45 open-market sales among the most recent 79 (latest 2026-06-05).
Recent Form 4 transactions
| Date | Insider | Role | Type | Shares | Price | Value | Filing |
|---|---|---|---|---|---|---|---|
| 2026-06-05 | Cheav Sotheara | Officer (See remarks) | Option exercise / conversion (derivative) | 5,399 | $0.00 | $0 | Form 4 |
| 2026-06-05 | Cheav Sotheara | Officer (See remarks) | Open-market sale | 1,647 | $85.41 | $140.7K | Form 4 |
| 2026-06-05 | Cheav Sotheara | Officer (See remarks) | Open-market sale | 400 | $84.01 | $33.6K | Form 4 |
| 2026-06-05 | Cheav Sotheara | Officer (See remarks) | Open-market sale | 968 | $82.61 | $80.0K | Form 4 |
| 2026-06-05 | Cheav Sotheara | Officer (See remarks) | Open-market sale | 2,384 | $81.73 | $194.8K | Form 4 |
| 2026-06-05 | Cheav Sotheara | Officer (See remarks) | Option exercise / conversion | 5,399 | $13.89 | $75.0K | Form 4 |
| 2026-06-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion (derivative) | 40,002 | $0.00 | $0 | Form 4 |
| 2026-06-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 826 | $87.91 | $72.6K | Form 4 |
| 2026-06-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 8,581 | $87.13 | $747.7K | Form 4 |
| 2026-06-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 10,992 | $86.07 | $946.1K | Form 4 |
| 2026-06-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 17,543 | $85.11 | $1.49M | Form 4 |
| 2026-06-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 2,060 | $83.86 | $172.8K | Form 4 |
| 2026-06-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion | 40,002 | $1.00 | $40.0K | Form 4 |
| 2026-06-04 | Cheav Sotheara | Officer (See remarks) | Option exercise / conversion (derivative) | 13,351 | $0.00 | $0 | Form 4 |
| 2026-06-04 | Cheav Sotheara | Officer (See remarks) | Open-market sale | 2,839 | $85.77 | $243.5K | Form 4 |
| 2026-06-04 | Cheav Sotheara | Officer (See remarks) | Open-market sale | 9,212 | $85.11 | $784.0K | Form 4 |
| 2026-06-04 | Cheav Sotheara | Officer (See remarks) | Open-market sale | 1,300 | $84.08 | $109.3K | Form 4 |
| 2026-06-04 | Cheav Sotheara | Officer (See remarks) | Option exercise / conversion | 13,351 | $13.89 | $185.4K | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion (derivative) | 60,000 | $0.00 | $0 | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 1,187 | $93.04 | $110.4K | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 5,843 | $92.38 | $539.8K | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 9,925 | $90.78 | $901.0K | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 32,450 | $89.84 | $2.92M | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 6,295 | $88.98 | $560.1K | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 4,300 | $87.57 | $376.6K | Form 4 |
| 2026-06-03 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion | 60,000 | $1.00 | $60.0K | Form 4 |
| 2026-05-19 | Dun Haiping | Director | Option exercise / conversion (derivative) | 5,000 | $0.00 | $0 | Form 4 |
| 2026-05-19 | Dun Haiping | Director | Open-market sale | 1,858 | $67.54 | $125.5K | Form 4 |
| 2026-05-19 | Dun Haiping | Director | Open-market sale | 1,309 | $67.21 | $88.0K | Form 4 |
| 2026-05-19 | Dun Haiping | Director | Open-market sale | 500 | $65.09 | $32.5K | Form 4 |
| 2026-05-19 | Dun Haiping | Director | Open-market sale | 1,333 | $63.84 | $85.1K | Form 4 |
| 2026-05-19 | Dun Haiping | Director | Option exercise / conversion | 5,000 | $5.60 | $28.0K | Form 4 |
| 2026-05-13 | Wang David H | Director, Officer (See Remarks), 10% owner | Grant / award / vesting (derivative) | 6,208 | $0.00 | $0 | Form 4 |
| 2026-04-17 | Pappis Charles C | Director | Option exercise / conversion (derivative) | 5,000 | $0.00 | $0 | Form 4 |
| 2026-04-17 | Pappis Charles C | Director | Open-market sale | 5,000 | $52.00 | $260.0K | Form 4 |
| 2026-04-17 | Pappis Charles C | Director | Option exercise / conversion | 5,000 | $29.18 | $145.9K | Form 4 |
| 2026-03-12 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion (derivative) | 50,000 | $0.00 | $0 | Form 4 |
| 2026-03-12 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 702 | $46.57 | $32.7K | Form 4 |
| 2026-03-12 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 38,737 | $45.74 | $1.77M | Form 4 |
| 2026-03-12 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 10,561 | $44.92 | $474.4K | Form 4 |
| 2026-03-12 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion | 50,000 | $1.00 | $50.0K | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Option exercise / conversion (derivative) | 38,551 | $0.00 | $0 | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Option exercise / conversion (derivative) | 60,000 | $0.00 | $0 | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Open-market sale | 564 | $46.57 | $26.3K | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Open-market sale | 29,348 | $45.74 | $1.34M | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Open-market sale | 8,639 | $44.94 | $388.2K | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Option exercise / conversion | 38,551 | $19.49 | $751.4K | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Open-market sale | 982 | $46.55 | $45.7K | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Open-market sale | 47,108 | $45.74 | $2.15M | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Open-market sale | 11,910 | $44.89 | $534.6K | Form 4 |
| 2026-03-12 | McKechnie Mark | Officer (See Remarks) | Option exercise / conversion | 60,000 | $13.89 | $833.4K | Form 4 |
| 2026-03-11 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion (derivative) | 60,000 | $0.00 | $0 | Form 4 |
| 2026-03-11 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 4,627 | $48.34 | $223.7K | Form 4 |
| 2026-03-11 | Wang David H | Director, Officer (See Remarks), 10% owner | Open-market sale | 55,373 | $47.89 | $2.65M | Form 4 |
| 2026-03-11 | Wang David H | Director, Officer (See Remarks), 10% owner | Option exercise / conversion | 60,000 | $1.00 | $60.0K | Form 4 |
| 2026-03-11 | Liu Tracy | Director | Option exercise / conversion (derivative) | 15,000 | $0.00 | $0 | Form 4 |
| 2026-03-11 | Liu Tracy | Director | Open-market sale | 3,377 | $48.25 | $162.9K | Form 4 |
| 2026-03-11 | Liu Tracy | Director | Open-market sale | 11,623 | $47.81 | $555.7K | Form 4 |
| 2026-03-11 | Liu Tracy | Director | Option exercise / conversion | 15,000 | $1.00 | $15.0K | Form 4 |
| 2026-03-10 | Liu Tracy | Director | Option exercise / conversion (derivative) | 45,000 | $0.00 | $0 | Form 4 |
| 2026-03-10 | Liu Tracy | Director | Open-market sale | 12,784 | $48.19 | $616.1K | Form 4 |
| 2026-03-10 | Liu Tracy | Director | Open-market sale | 32,216 | $47.06 | $1.52M | Form 4 |
| 2026-03-10 | Liu Tracy | Director | Option exercise / conversion | 45,000 | $1.00 | $45.0K | Form 4 |
| 2026-03-09 | Dun Haiping | Director | Option exercise / conversion (derivative) | 5,000 | $0.00 | $0 | Form 4 |
| 2026-03-09 | Dun Haiping | Director | Open-market sale | 900 | $43.94 | $39.5K | Form 4 |
| 2026-03-09 | Dun Haiping | Director | Open-market sale | 4,100 | $43.37 | $177.8K | Form 4 |
| 2026-03-09 | Dun Haiping | Director | Option exercise / conversion | 5,000 | $5.60 | $28.0K | Form 4 |
| 2026-03-06 | Feng Lisa | Officer (See remarks) | Option exercise / conversion (derivative) | 15,000 | $0.00 | $0 | Form 4 |
| 2026-03-06 | Feng Lisa | Officer (See remarks) | Open-market sale | 200 | $46.58 | $9.3K | Form 4 |
| 2026-03-06 | Feng Lisa | Officer (See remarks) | Open-market sale | 14,800 | $46.07 | $681.8K | Form 4 |
| 2026-03-06 | Feng Lisa | Officer (See remarks) | Option exercise / conversion | 15,000 | $4.55 | $68.3K | Form 4 |
| 2026-03-05 | Feng Lisa | Officer (See remarks) | Option exercise / conversion (derivative) | 15,000 | $0.00 | $0 | Form 4 |
| 2026-03-05 | Feng Lisa | Officer (See remarks) | Open-market sale | 6,950 | $50.24 | $349.2K | Form 4 |
| 2026-03-05 | Feng Lisa | Officer (See remarks) | Open-market sale | 8,050 | $49.81 | $401.0K | Form 4 |
| 2026-03-05 | Feng Lisa | Officer (See remarks) | Option exercise / conversion | 15,000 | $4.55 | $68.3K | Form 4 |
| 2026-03-05 | Pappis Charles C | Director | Option exercise / conversion (derivative) | 5,000 | $0.00 | $0 | Form 4 |
| 2026-03-05 | Pappis Charles C | Director | Open-market sale | 5,000 | $50.09 | $250.4K | Form 4 |
| 2026-03-05 | Pappis Charles C | Director | Option exercise / conversion | 5,000 | $29.18 | $145.9K | Form 4 |
| 2026-02-04 | Wang David H | Director, Officer (See Remarks), 10% owner | Grant / award / vesting (derivative) | 545,400 | $0.00 | $0 | Form 4 |
Ask the chat about ACMR's insider activity →
Transaction types are the SEC Form 4 codes: open-market purchases (P) and sales (S) are the only rows that reflect open-market conviction. Awards/vesting (A), option exercises (M/X/C), shares withheld for taxes (F) and gifts (G) are compensation or mechanical, not buying or selling on the open market. Sales may be planned and non-discretionary (e.g. a Rule 10b5-1 plan); open-market buying is not a recommendation to buy. Informational only — not financial advice.
Source: SEC EDGAR Form 3/4/5. See the full company profile: ACM RESEARCH CLASS A INC (ACMR).
Last updated 2026-06-05 (most recent filing date).
Informational only — NOT financial advice. Insider filings are sourced from SEC EDGAR and shown with their reported dates.