ACMR insider transaction filings
ACM Research, Inc. — 50 most recent Form 4 filings from SEC EDGAR, normalized by FilingPulse. Latest filing: 2026-09-10. Screen ACMR transaction legs live →
Insider transaction summary — last 90 days
2026-06-24 to 2026-09-22, from the filings listed below: 7 Form 4 filings. Counts and totals are arithmetic on values as filed — descriptive data, not a recommendation.
- Open-market purchases (code P, non-derivative): none reported.
- Open-market sales (code S, non-derivative): 15 legs across 3 filings by 3 insiders — 200,199 shares, $15,300,651 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 17.
- Largest priced transaction: sale of 51,374 shares @ $77.15 ($3,963,504) by Wang David H, filed 2026-09-10.
By insider — same window
Open-market purchase/sale legs on non-derivative securities, grouped by the filing's reporting owner(s); joint filings appear once. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Insider | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|
| Wang David H — See Remarks, Director, 10% owner | 2 | — | 9 legs · 140,000 sh · $10,630,010 | 5 |
| McKechnie Mark — See Remarks | 1 | — | 3 legs · 55,199 sh · $4,264,971 | 4 |
| Dun Haiping — Director | 2 | — | 3 legs · 5,000 sh · $405,670 | 4 |
| Liu Tracy — Director | 1 | — | — | 2 |
| Pappis Charles C — Director | 1 | — | — | 2 |
Recent Form 4 filings — ACM Research, Inc.
| Filed | Form | Insider | Reported transactions | Source |
|---|---|---|---|---|
| 2026-09-10 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 70,000 @ $1 · Sale (S): 4,803 @ $75.99 · Sale (S): 51,374 @ $77.15 · Sale (S): 12,323 @ $78.08 · Sale (S): 1,500 @ $78.57 · Option exercise (M): 70,000 @ $1 · +7 more | EDGAR |
| 2026-08-26 | 4 | Dun Haiping — Director | Grant/award (A): 6,400 (derivative) @ $0 · Grant/award (A): 728 (derivative) @ $0 | EDGAR |
| 2026-08-26 | 4 | Liu Tracy — Director | Grant/award (A): 6,400 (derivative) @ $0 · Grant/award (A): 728 (derivative) @ $0 | EDGAR |
| 2026-08-26 | 4 | Pappis Charles C — Director | Grant/award (A): 6,400 (derivative) @ $0 · Grant/award (A): 728 (derivative) @ $0 | EDGAR |
| 2026-08-21 | 4 | McKechnie Mark — See Remarks | Option exercise (M): 30,199 @ $19.49 · Option exercise (M): 25,000 @ $13.89 · Sale (S): 13,625 @ $76.34 · Sale (S): 30,365 @ $77.45 · Sale (S): 11,209 @ $77.89 · Option exercise (M): 30,199 (derivative) @ $0 · +1 more | EDGAR |
| 2026-08-20 | 4 | Dun Haiping — Director | Option exercise (M): 5,000 @ $5.60 · Sale (S): 1,200 @ $80.29 · Sale (S): 3,400 @ $81.31 · Sale (S): 400 @ $82.17 · Option exercise (M): 5,000 (derivative) @ $0 | EDGAR |
| 2026-07-06 | 4 | Wang David H — See Remarks, Director, 10% owner | Grant/award (A): 6,208 (derivative) @ $0 | EDGAR |
| 2026-06-05 | 4 | Cheav Sotheara — See remarks | Option exercise (M): 13,351 @ $13.89 · Sale (S): 1,300 @ $84.08 · Sale (S): 9,212 @ $85.11 · Sale (S): 2,839 @ $85.77 · Option exercise (M): 5,399 @ $13.89 · Sale (S): 2,384 @ $81.73 · +5 more | EDGAR |
| 2026-06-05 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 60,000 @ $1 · Sale (S): 4,300 @ $87.57 · Sale (S): 6,295 @ $88.98 · Sale (S): 32,450 @ $89.84 · Sale (S): 9,925 @ $90.78 · Sale (S): 5,843 @ $92.38 · +9 more | EDGAR |
| 2026-05-21 | 4 | Dun Haiping — Director | Option exercise (M): 5,000 @ $5.60 · Sale (S): 1,333 @ $63.84 · Sale (S): 500 @ $65.09 · Sale (S): 1,309 @ $67.21 · Sale (S): 1,858 @ $67.54 · Option exercise (M): 5,000 (derivative) @ $0 | EDGAR |
| 2026-04-21 | 4 | Pappis Charles C — Director | Option exercise (M): 5,000 @ $29.18 · Sale (S): 5,000 @ $52 · Option exercise (M): 5,000 (derivative) @ $0 | EDGAR |
| 2026-03-13 | 4 | McKechnie Mark — See Remarks | Option exercise (M): 60,000 @ $13.89 · Sale (S): 11,910 @ $44.89 · Sale (S): 47,108 @ $45.74 · Sale (S): 982 @ $46.55 · Option exercise (M): 38,551 @ $19.49 · Sale (S): 8,639 @ $44.94 · +4 more | EDGAR |
| 2026-03-13 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 60,000 @ $1 · Sale (S): 55,373 @ $47.89 · Sale (S): 4,627 @ $48.34 · Option exercise (M): 50,000 @ $1 · Sale (S): 10,561 @ $44.92 · Sale (S): 38,737 @ $45.74 · +3 more | EDGAR |
| 2026-03-12 | 4 | Liu Tracy — Director | Option exercise (M): 45,000 @ $1 · Sale (S): 32,216 @ $47.06 · Sale (S): 12,784 @ $48.19 · Option exercise (M): 15,000 @ $1 · Sale (S): 11,623 @ $47.81 · Sale (S): 3,377 @ $48.25 · +2 more | EDGAR |
| 2026-03-11 | 4 | Dun Haiping — Director | Option exercise (M): 5,000 @ $5.60 · Sale (S): 4,100 @ $43.37 · Sale (S): 900 @ $43.94 · Option exercise (M): 5,000 (derivative) @ $0 | EDGAR |
| 2026-03-09 | 4 | Feng Lisa — See remarks | Option exercise (M): 15,000 @ $4.55 · Sale (S): 8,050 @ $49.81 · Sale (S): 6,950 @ $50.24 · Option exercise (M): 15,000 @ $4.55 · Sale (S): 14,800 @ $46.07 · Sale (S): 200 @ $46.58 · +2 more | EDGAR |
| 2026-03-09 | 4 | Pappis Charles C — Director | Option exercise (M): 5,000 @ $29.18 · Sale (S): 5,000 @ $50.09 · Option exercise (M): 5,000 (derivative) @ $0 | EDGAR |
| 2026-02-06 | 4 | Wang David H — See Remarks, Director, 10% owner | Grant/award (A): 545,400 (derivative) @ $0 | EDGAR |
| 2025-12-08 | 4 | McKechnie Mark — See Remarks | Option exercise (M): 8,750 @ $4.55 · Sale (S): 7,754 @ $33.50 · Sale (S): 996 @ $34.26 · Option exercise (M): 22,500 @ $25.45 · Sale (S): 22,500 @ $35.45 · Option exercise (M): 8,750 (derivative) @ $0 · +1 more | EDGAR |
| 2025-12-05 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 70,000 @ $1 · Sale (S): 68,800 @ $33.05 · Sale (S): 1,200 @ $33.56 · Option exercise (M): 60,000 @ $1 · Sale (S): 19,817 @ $33.52 · Sale (S): 40,183 @ $34.42 · +2 more | EDGAR |
| 2025-12-04 | 4 | Chen Fuping — See remarks | Option exercise (M): 100,000 @ $1.77 · Sale (S): 100,000 @ $33.20 · Option exercise (M): 20,000 @ $1.77 · Sale (S): 19,700 @ $33.05 · Sale (S): 300 @ $33.57 · Option exercise (M): 100,000 (derivative) @ $0 · +1 more | EDGAR |
| 2025-11-14 | 4 | Dun Haiping — Director | Gift (G): 755,090 @ $0 | EDGAR |
| 2025-11-14 | 4 | Feng Lisa — See remarks | Option exercise (M): 15,000 @ $5.60 · Sale (S): 15,000 @ $32.76 · Option exercise (M): 15,000 @ $5.60 · Sale (S): 15,000 @ $33.77 · Option exercise (M): 15,000 (derivative) @ $0 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2025-10-29 | 4 | Wang David H — See Remarks, Director, 10% owner | Grant/award (A): 545,400 (derivative) @ $0 | EDGAR |
| 2025-09-30 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 130,000 @ $1 · Option exercise (M): 130,000 (derivative) @ $0 | EDGAR |
| 2025-09-19 | 4 | Cheav Sotheara — See remarks | Option exercise (M): 10,000 @ $13.89 · Sale (S): 10,000 @ $35 · Option exercise (M): 10,000 (derivative) @ $0 | EDGAR |
| 2025-09-19 | 4 | Liu Tracy — Director | Option exercise (M): 15,000 @ $1 · Sale (S): 15,000 @ $33 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2025-09-19 | 4 | Wang Jian — See remarks | Option exercise (M): 30,000 @ $5.60 · Sale (S): 30,000 @ $35 · Option exercise (M): 30,000 (derivative) @ $0 | EDGAR |
| 2025-09-05 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 70,000 @ $1 · Sale (S): 66,057 @ $26.73 · Sale (S): 3,943 @ $27.31 · Option exercise (M): 60,000 @ $1 · Sale (S): 60,000 @ $26.44 · Option exercise (M): 70,000 (derivative) @ $0 · +1 more | EDGAR |
| 2025-08-26 | 4 | Cheav Sotheara — See remarks | Option exercise (M): 11,152 @ $13.89 · Sale (S): 11,152 @ $30 · Option exercise (M): 11,152 (derivative) @ $0 | EDGAR |
| 2025-08-26 | 4 | Wang Jian — See remarks | Option exercise (M): 30,000 @ $5.60 · Sale (S): 30,000 @ $30 · Option exercise (M): 30,000 @ $5.60 · Sale (S): 30,000 @ $32 · Option exercise (M): 30,000 (derivative) @ $0 · Option exercise (M): 30,000 (derivative) @ $0 | EDGAR |
| 2025-08-14 | 4 | Dun Haiping — Director | Grant/award (A): 20,000 (derivative) @ $0 | EDGAR |
| 2025-08-14 | 4 | Liu Tracy — Director | Grant/award (A): 20,000 (derivative) @ $0 | EDGAR |
| 2025-08-14 | 4 | Pappis Charles C — Director | Grant/award (A): 20,000 (derivative) @ $0 | EDGAR |
| 2025-07-17 | 4 | Liu Tracy — Director | Option exercise (M): 15,000 @ $1 · Sale (S): 15,000 @ $30 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2025-07-09 | 4 | Feng Lisa — See remarks | Option exercise (M): 15,000 @ $5.60 · Sale (S): 15,000 @ $28 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2025-06-26 | 4 | Feng Lisa — See remarks | Option exercise (M): 15,000 @ $5.60 · Sale (S): 15,000 @ $26 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2025-05-23 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 70,000 @ $1 · Sale (S): 69,992 @ $23.60 · Sale (S): 8 @ $24.04 · Option exercise (M): 60,000 @ $1 · Sale (S): 60,000 @ $22.63 · Option exercise (M): 70,000 (derivative) @ $0 · +1 more | EDGAR |
| 2025-05-21 | 4 | Pappis Charles C — Director | Grant/award (A): 10,000 (derivative) @ $0 | EDGAR |
| 2025-05-16 | 4 | McKechnie Mark — See Remarks | Option exercise (M): 15,000 @ $5.60 · Sale (S): 15,000 @ $25.22 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2025-03-19 | 4 | Hu Chenming — Director | Sale (S): 163,308 @ $30 | EDGAR |
| 2025-03-18 | 4 | Dun Haiping — Director | Sale (S): 2,456 @ $28.32 · Sale (S): 7,062 @ $29.23 | EDGAR |
| 2025-03-14 | 4 | McKechnie Mark — See Remarks | Option exercise (M): 15,000 @ $5.60 · Sale (S): 15,000 @ $27.42 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2025-03-13 | 4 | Wang David H — See Remarks, Director, 10% owner | Sale (S): 56,250 @ $26.57 · Sale (S): 37,500 @ $27.42 · Sale (S): 36,481 @ $27.29 · Sale (S): 1,019 @ $27.65 | EDGAR |
| 2025-03-12 | 4 | Dun Haiping — Director | Sale (S): 15,001 @ $26.54 | EDGAR |
| 2025-03-05 | 4 | Dun Haiping — Director | Option exercise (M): 25,001 @ $0.50 · Tax withholding (F): 482 @ $25.94 · Option exercise (M): 25,001 (derivative) @ $0 | EDGAR |
| 2025-03-05 | 4 | Wang David H — See Remarks, Director, 10% owner | Option exercise (M): 210,000 @ $0.50 · Tax withholding (F): 4,048 @ $25.94 · Option exercise (M): 210,000 (derivative) @ $0 | EDGAR |
| 2025-02-10 | 4 | Cheav Sotheara — See remarks | Option exercise (M): 10,000 @ $13.89 · Option exercise (M): 12,598 @ $13.89 · Sale (S): 22,598 @ $23 · Option exercise (M): 10,000 (derivative) @ $0 · Option exercise (M): 12,598 (derivative) @ $0 | EDGAR |
| 2025-02-10 | 4 | McKechnie Mark — See Remarks | Option exercise (M): 15,000 @ $5.60 · Sale (S): 15,000 @ $22 · Option exercise (M): 15,000 (derivative) @ $0 | EDGAR |
| 2024-12-03 | 4 | Wang David H — See Remarks, Director, 10% owner | Sale (S): 56,250 @ $17.44 | EDGAR |
Recent 8-K events — ACM Research, Inc.
| Filed | Form | Items reported | Source |
|---|---|---|---|
| 2026-08-27 | 8-K | 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-08-07 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-06-22 | 8-K | 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-06-12 | 8-K | 5.07 — Submission of Matters to a Vote of Security Holders | EDGAR |
| 2026-05-29 | 8-K | 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-22 | 8-K | 8.01 — Other Events 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-15 | 8-K | 8.01 — Other Events | EDGAR |
| 2026-05-12 | 8-K | 1.01 — Entry into a Material Definitive Agreement 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-05-07 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
| 2026-04-27 | 8-K | 2.02 — Results of Operations and Financial Condition 9.01 — Financial Statements and Exhibits | EDGAR |
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