SEC CIK 1721581
Dun Haiping
Reported ownership across 1 company, sourced from SEC Form 4 filings and updated daily.
Current Positions
| Company | Shares Owned | As Of |
|---|---|---|
| ACMRview stock → | 0 | 2026-08-18 |
Position History — ACMR
Reported shares owned immediately after each Form 4 transaction, over time.
Recent Filings — ACMR
| Date | Activity | Shares | Price | Owned After |
|---|---|---|---|---|
| 2026-08-18 | Option exercise (derivative) | 5,000 | $0.00 | 45,000 |
| 2026-08-18 | Open-market sale | 400 | $82.17 | 0 |
| 2026-08-18 | Open-market sale | 3,400 | $81.31 | 400 |
| 2026-08-18 | Open-market sale | 1,200 | $80.29 | 3,800 |
| 2026-08-18 | Option exercise | 5,000 | $5.60 | 5,000 |
| 2026-08-12 | Grant / award (derivative) | 728 | $0.00 | 728 |
| 2026-08-12 | Grant / award (derivative) | 6,400 | $0.00 | 6,400 |
| 2026-05-19 | Option exercise (derivative) | 5,000 | $0.00 | 50,000 |
| 2026-05-19 | Open-market sale | 1,858 | $67.54 | 0 |
| 2026-05-19 | Open-market sale | 1,309 | $67.21 | 1,858 |
| 2026-05-19 | Open-market sale | 500 | $65.09 | 3,167 |
| 2026-05-19 | Open-market sale | 1,333 | $63.84 | 3,667 |
| 2026-05-19 | Option exercise | 5,000 | $5.60 | 5,000 |
| 2026-03-09 | Option exercise (derivative) | 5,000 | $0.00 | 55,000 |
| 2026-03-09 | Open-market sale | 900 | $43.94 | 0 |
| 2026-03-09 | Open-market sale | 4,100 | $43.37 | 900 |
| 2026-03-09 | Option exercise | 5,000 | $5.60 | 5,000 |
| 2025-11-12 | Gift | 755,090 | $0.00 | 0 |
| 2025-08-12 | Grant / award (derivative) | 20,000 | $0.00 | 20,000 |
| 2025-03-14 | Open-market sale | 7,062 | $29.23 | 755,090 |
| 2025-03-14 | Open-market sale | 2,456 | $28.32 | 762,152 |
| 2025-03-10 | Open-market sale | 15,001 | $26.54 | 764,608 |
| 2025-03-03 | Option exercise (derivative) | 25,001 | $0.00 | 0 |
| 2025-03-03 | Tax withholding | 482 | $25.94 | 779,609 |
| 2025-03-03 | Option exercise | 25,001 | $0.50 | 780,091 |
| 2024-11-29 | Open-market sale | 19,058 | $17.43 | 755,090 |
| 2024-11-22 | Open-market sale | 15,000 | $19.12 | 774,148 |
| 2024-11-14 | Option exercise (derivative) | 35,000 | $0.00 | 25,001 |
| 2024-11-14 | Option exercise | 35,000 | $0.50 | 790,090 |
| 2024-11-14 | Tax withholding | 942 | $18.59 | 789,148 |
| 2024-08-29 | Open-market sale | 19,097 | $18.08 | 755,090 |
| 2024-08-22 | Open-market sale | 15,000 | $19.85 | 774,187 |
| 2024-08-14 | Option exercise (derivative) | 35,000 | $0.00 | 60,001 |
| 2024-08-14 | Option exercise | 35,000 | $0.50 | 790,090 |
| 2024-08-14 | Tax withholding | 903 | $19.38 | 789,187 |
| 2024-08-12 | Grant / award (derivative) | 20,000 | $0.00 | 20,000 |
| 2024-06-27 | Gift | 100,000 | $0.00 | 755,090 |
| 2024-06-27 | Gift | 300,000 | $0.00 | 0 |
| 2024-05-29 | Open-market sale | 19,239 | $22.63 | 855,090 |
| 2024-05-22 | Open-market sale | 15,000 | $22.88 | 874,329 |
| 2024-05-14 | Option exercise (derivative) | 35,000 | $0.00 | 95,001 |
| 2024-05-14 | Option exercise | 35,000 | $0.50 | 890,090 |
| 2024-05-14 | Tax withholding | 761 | $23.02 | 889,329 |
| 2024-03-14 | Open-market sale | 3,557 | $28.34 | 855,090 |
| 2024-03-14 | Open-market sale | 15,877 | $27.56 | 858,647 |
| 2024-03-08 | Open-market sale | 15,000 | $30.36 | 874,524 |
| 2024-03-01 | Option exercise (derivative) | 35,000 | $0.00 | 130,001 |
| 2024-03-01 | Option exercise | 35,000 | $0.50 | 890,090 |
| 2024-03-01 | Tax withholding | 566 | $30.92 | 889,524 |
| 2023-11-29 | Open-market sale | 18,984 | $17.25 | 855,090 |
| 2023-11-22 | Open-market sale | 15,000 | $17.66 | 874,074 |
| 2023-11-14 | Option exercise (derivative) | 35,000 | $0.00 | 165,001 |
| 2023-11-14 | Tax withholding | 1,016 | $17.23 | 889,074 |
| 2023-11-14 | Option exercise | 35,000 | $0.50 | 890,090 |
| 2023-08-22 | Open-market sale | 32,098 | $13.85 | 855,090 |
| 2023-08-10 | Grant / award (derivative) | 24,000 | $0.00 | 24,000 |
| 2023-08-10 | Grant / award (derivative) | 30,000 | $0.00 | 30,000 |
| 2023-08-10 | Grant / award (derivative) | 30,000 | $0.00 | 30,000 |
| 2023-08-10 | Grant / award (derivative) | 24,000 | $0.00 | 24,000 |
| 2023-06-01 | Open-market sale | 37,500 | $10.00 | 887,188 |
| 2023-05-22 | Option exercise (derivative) | 37,500 | $0.00 | 200,001 |
| 2023-05-22 | Option exercise | 37,500 | $0.50 | 926,616 |
| 2023-05-22 | Tax withholding | 1,928 | $9.73 | 924,688 |
| 2023-03-16 | Open-market sale | 37,500 | $12.06 | 889,116 |
| 2023-03-09 | Option exercise (derivative) | 37,500 | $0.00 | 237,501 |
| 2023-03-09 | Tax withholding | 1,504 | $12.47 | 926,616 |
| 2023-03-09 | Option exercise | 37,500 | $0.50 | 928,120 |
| 2022-11-30 | Open-market sale | 35,327 | $8.43 | 890,620 |
| 2022-11-22 | Option exercise (derivative) | 37,500 | $0.00 | 275,001 |
| 2022-11-22 | Tax withholding | 2,173 | $8.63 | 925,947 |
| 2022-11-22 | Option exercise | 37,500 | $0.50 | 928,120 |
| 2022-11-14 | Option exercise (derivative) | 37,500 | $0.00 | 312,501 |
| 2022-11-14 | Option exercise | 37,500 | $0.50 | 892,590 |
| 2022-11-14 | Tax withholding | 1,970 | $9.52 | 890,620 |
| 2022-08-22 | Open-market sale | 36,537 | $16.10 | 855,090 |
| 2022-08-15 | Option exercise (derivative) | 37,500 | $0.00 | 350,001 |
| 2022-08-15 | Tax withholding | 963 | $19.49 | 928,146 |
| 2022-08-15 | Option exercise | 37,500 | $0.50 | 929,109 |
| 2022-08-15 | Open-market sale | 36,519 | $19.28 | 891,627 |
| 2022-08-08 | Option exercise (derivative) | 37,500 | $0.00 | 387,501 |
| 2022-08-08 | Option exercise | 37,500 | $0.50 | 892,590 |
| 2022-08-08 | Tax withholding | 981 | $19.13 | 891,609 |
| 2022-06-30 | Grant / award (derivative) | 24,000 | $0.00 | 24,000 |
| 2022-05-27 | Open-market sale | 36,150 | $15.00 | 855,090 |
| 2022-05-18 | Option exercise (derivative) | 37,500 | $0.00 | 425,001 |
| 2022-05-18 | Option exercise | 37,500 | $0.50 | 892,590 |
| 2022-05-18 | Tax withholding | 1,350 | $13.89 | 891,240 |
| 2022-03-09 | Option exercise (derivative) | 12,269 | $0.00 | 231 |
| 2022-03-09 | Open-market sale | 1,200 | $80.48 | 308,368 |
| 2022-03-09 | Option exercise | 12,269 | $1.50 | 309,568 |
| 2022-03-09 | Open-market sale | 8,069 | $82.11 | 300,299 |
| 2022-03-09 | Open-market sale | 3,000 | $82.66 | 297,299 |
| 2022-03-02 | Option exercise (derivative) | 12,500 | $0.00 | 154,167 |
| 2022-03-02 | Tax withholding | 231 | $81.46 | 297,299 |
| 2022-03-02 | Option exercise | 12,500 | $1.50 | 297,530 |
| 2021-02-22 | Grant / award (derivative) | 5,000 | $0.00 | 5,000 |
| 2021-02-22 | Grant / award (derivative) | 5,000 | $0.00 | 5,000 |
| 2020-03-20 | Grant / award (derivative) | 10,000 | $0.00 | 10,000 |
| 2019-08-23 | Disposition to issuer | 28,661 | $13.20 | 285,030 |
| 2019-04-23 | Grant / award (derivative) | 20,000 | $0.00 | 20,000 |
| 2017-11-02 | — | — | — | 313,691 |
| 2017-11-02 | — | — | — | 100,000 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.