Dun Haiping — SEC Form 4 filings
SEC reporting owner CIK 1721581. 23 Form 4 filings on record with FilingPulse; latest filed 2026-08-26.
Transaction summary — filings shown
Covers all 23 filings on record, filed 2024-03-05 to 2026-08-26. 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): 21 legs across 13 filings — 176,347 shares, $4,662,605 total (shares × price as filed).
- Other reported legs (grants, option exercises, tax withholding, gifts, derivative-security transactions, …): 28.
- Largest priced transaction: sale of 15,000 shares @ $30.36 ($455,400) in ACM Research, Inc., filed 2024-03-12.
By issuer — same filings
Open-market purchase/sale legs on non-derivative securities, grouped by issuer. Role is as filed on the newest filing for that issuer. Dollar totals cover priced legs only (shares × price as filed). Ordered by priced transaction value, largest first.
| Issuer | Role (as filed) | Filings | Purchases (P) | Sales (S) | Other legs |
|---|---|---|---|---|---|
| ACM Research, Inc. (ACMR) | Director | 23 | — | 21 legs · 176,347 sh · $4,662,605 | 28 |
Form 4 filings — Dun Haiping
| Filed | Form | Issuer | Reported transactions | Source |
|---|---|---|---|---|
| 2026-08-26 | 4 | ACM Research, Inc. (ACMR) | Grant/award (A): 6,400 (derivative) @ $0 · Grant/award (A): 728 (derivative) @ $0 | EDGAR |
| 2026-08-20 | 4 | ACM Research, Inc. (ACMR) | 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 |
| 2026-05-21 | 4 | ACM Research, Inc. (ACMR) | 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 |
| 2026-03-11 | 4 | ACM Research, Inc. (ACMR) | 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 |
| 2025-11-14 | 4 | ACM Research, Inc. (ACMR) | Gift (G): 755,090 @ $0 | EDGAR |
| 2025-08-14 | 4 | ACM Research, Inc. (ACMR) | Grant/award (A): 20,000 (derivative) @ $0 | EDGAR |
| 2025-03-18 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 2,456 @ $28.32 · Sale (S): 7,062 @ $29.23 | EDGAR |
| 2025-03-12 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 15,001 @ $26.54 | EDGAR |
| 2025-03-05 | 4 | ACM Research, Inc. (ACMR) | Option exercise (M): 25,001 @ $0.50 · Tax withholding (F): 482 @ $25.94 · Option exercise (M): 25,001 (derivative) @ $0 | EDGAR |
| 2024-12-03 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 19,058 @ $17.43 | EDGAR |
| 2024-11-26 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 15,000 @ $19.12 | EDGAR |
| 2024-11-18 | 4 | ACM Research, Inc. (ACMR) | Option exercise (M): 35,000 @ $0.50 · Tax withholding (F): 942 @ $18.59 · Option exercise (M): 35,000 (derivative) @ $0 | EDGAR |
| 2024-09-03 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 19,097 @ $18.08 | EDGAR |
| 2024-08-26 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 15,000 @ $19.85 | EDGAR |
| 2024-08-20 | 4 | ACM Research, Inc. (ACMR) | Grant/award (A): 20,000 (derivative) @ $0 | EDGAR |
| 2024-08-16 | 4 | ACM Research, Inc. (ACMR) | Option exercise (M): 35,000 @ $0.50 · Tax withholding (F): 903 @ $19.38 · Option exercise (M): 35,000 (derivative) @ $0 | EDGAR |
| 2024-07-01 | 4 | ACM Research, Inc. (ACMR) | Gift (G): 100,000 @ $0 · Gift (G): 300,000 @ $0 | EDGAR |
| 2024-05-31 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 19,239 @ $22.63 | EDGAR |
| 2024-05-24 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 15,000 @ $22.88 | EDGAR |
| 2024-05-16 | 4 | ACM Research, Inc. (ACMR) | Option exercise (M): 35,000 @ $0.50 · Tax withholding (F): 761 @ $23.02 · Option exercise (M): 35,000 (derivative) @ $0 | EDGAR |
| 2024-03-15 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 15,877 @ $27.56 · Sale (S): 3,557 @ $28.34 | EDGAR |
| 2024-03-12 | 4 | ACM Research, Inc. (ACMR) | Sale (S): 15,000 @ $30.36 | EDGAR |
| 2024-03-05 | 4 | ACM Research, Inc. (ACMR) | Option exercise (M): 35,000 @ $0.50 · Tax withholding (F): 566 @ $30.92 · Option exercise (M): 35,000 (derivative) @ $0 | EDGAR |
FilingPulse's Form 4 archive currently extends back to 2024-01-11 and is expanding backward through EDGAR history — earlier filings by this insider may not be indexed yet. Names and roles are shown as filed.
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