ACM Research, Inc. — Insider Transactions
Form 4 filings by directors, officers, and 10%+ shareholders
SEC rules require corporate insiders — including directors, executive officers, and any shareholder owning more than 10% of a company's shares — to report changes in their ownership within two business days of a transaction. These disclosures are filed as Form 4. Open-market purchases (code P) are generally considered the most meaningful signal, as insiders are spending their own money.
| Insider | Title | Type | Shares | Price | Value | Owns After | Date |
|---|---|---|---|---|---|---|---|
| Dun Haiping | — | Option Exercise | 35,000 | $0.50 | $17,500 | 890,090 | May 14, 2024 |
| Wang David H | See Remarks | Sale | 76,478 | $27.51 | $2,103,910 | 514,629 | Mar 14, 2024 |
| Dun Haiping | — | Sale | 3,557 | $28.34 | $100,805 | 855,090 | Mar 14, 2024 |
| Cheav Sotheara | See remarks | Sale | 2,383 | $28.32 | $67,487 | 100,002 | Mar 14, 2024 |
| Dun Haiping | — | Sale | 15,000 | $30.36 | $455,400 | 874,524 | Mar 8, 2024 |
| Wang David H | See Remarks | Sale | 45,000 | $30.36 | $1,366,200 | 636,107 | Mar 8, 2024 |
| Wang David H | See Remarks | Option Exercise | 180,000 | $0.50 | $90,000 | 684,018 | Mar 1, 2024 |
| Dun Haiping | — | Option Exercise | 35,000 | $0.50 | $17,500 | 890,090 | Mar 1, 2024 |
| Feng Lisa | See remarks | Option Exercise | 7,500 | $5.60 | $42,000 | 57,501 | Feb 28, 2024 |
| Liu Tracy | — | Option Exercise | 12,500 | $5.60 | $70,000 | 123,272 | Feb 28, 2024 |
| McKechnie Mark | See Remarks | Sale | 10,000 | $22.00 | $220,000 | 900 | Jan 12, 2024 |
| Liu Tracy | — | Sale | 10,000 | $20.00 | $200,000 | 110,772 | Dec 26, 2023 |
| Feng Lisa | See remarks | Sale | 7,500 | $20.00 | $150,000 | 50,001 | Dec 26, 2023 |
| Dun Haiping | — | Sale | 18,984 | $17.25 | $327,474 | 855,090 | Nov 29, 2023 |
| Wang David H | See Remarks | Sale | 39,776 | $17.13 | $681,363 | 504,018 | Nov 29, 2023 |
| Wang David H | See Remarks | Sale | 45,000 | $17.67 | $795,150 | 633,794 | Nov 22, 2023 |
| Dun Haiping | — | Sale | 15,000 | $17.66 | $264,900 | 874,074 | Nov 22, 2023 |
| Liu Tracy | — | Sale | 15,000 | $17.91 | $268,650 | 36,924 | Nov 20, 2023 |
| Wang David H | See Remarks | Option Exercise | 180,000 | $0.50 | $90,000 | 684,018 | Nov 14, 2023 |
| Dun Haiping | — | Tax Withholding | 1,016 | $17.23 | $17,506 | 889,074 | Nov 14, 2023 |
| Cheav Sotheara | See remarks | Option Exercise | 12,500 | $4.62 | $57,750 | 136,002 | Nov 13, 2023 |
| McKechnie Mark | See Remarks | Sale | 11,250 | $20.00 | $225,000 | 900 | Oct 11, 2023 |
| Wang David H | See Remarks | Sale | 3,573 | $18.72 | $66,887 | 589,134 | Sep 13, 2023 |
| Wang David H | See Remarks | Tax Withholding | 4,884 | $18.43 | $90,012 | 679,134 | Sep 4, 2023 |
| McKechnie Mark | See Remarks | Sale | 30,000 | $18.00 | $540,000 | 900 | Sep 1, 2023 |
| Chen Fuping | See remarks | Option Exercise | 8,835 | $1.77 | $15,638 | 105,000 | Aug 23, 2023 |
| Dun Haiping | — | Sale | 32,098 | $13.85 | $444,557 | 855,090 | Aug 22, 2023 |
| Feng Lisa | See remarks | Sale | 22,500 | $15.00 | $337,500 | 50,001 | Jul 3, 2023 |
| Cheav Sotheara | See remarks | Sale | 39,000 | $10.00 | $390,000 | 110,002 | Jun 6, 2023 |
| Dun Haiping | — | Sale | 37,500 | $10.00 | $375,000 | 887,188 | Jun 1, 2023 |
| Dun Haiping | — | Option Exercise | 37,500 | $0.50 | $18,750 | 926,616 | May 22, 2023 |
| Dun Haiping | — | Sale | 37,500 | $12.06 | $452,250 | 889,116 | Mar 16, 2023 |
| Dun Haiping | — | Tax Withholding | 1,504 | $12.47 | $18,755 | 926,616 | Mar 9, 2023 |
| Feng Lisa | See remarks | Option Exercise | 22,500 | $1.77 | $39,825 | 72,501 | Mar 9, 2023 |
| Dun Haiping | — | Sale | 35,327 | $8.43 | $297,807 | 890,620 | Nov 30, 2022 |
| Dun Haiping | — | Tax Withholding | 2,173 | $8.63 | $18,753 | 925,947 | Nov 22, 2022 |
| Dun Haiping | — | Option Exercise | 37,500 | $0.50 | $18,750 | 892,590 | Nov 14, 2022 |
| Dun Haiping | — | Sale | 36,537 | $16.10 | $588,246 | 855,090 | Aug 22, 2022 |
| Cheav Sotheara | See remarks | Sale | 10,000 | $17.50 | $175,000 | 110,002 | Aug 18, 2022 |
| Cheav Sotheara | See remarks | Sale | 9,182 | $17.50 | $160,685 | 125,820 | Aug 17, 2022 |
| Dun Haiping | — | Tax Withholding | 963 | $19.49 | $18,769 | 928,146 | Aug 15, 2022 |
| Dun Haiping | — | Option Exercise | 37,500 | $0.50 | $18,750 | 892,590 | Aug 8, 2022 |
| Dun Haiping | — | Sale | 36,150 | $15.00 | $542,250 | 855,090 | May 27, 2022 |
| Dun Haiping | — | Option Exercise | 37,500 | $0.50 | $18,750 | 892,590 | May 18, 2022 |
| McKechnie Mark | See Remarks | Sale | 700 | $63.42 | $44,394 | 3,100 | Mar 10, 2022 |
| Dun Haiping | — | Sale | 1,200 | $80.48 | $96,576 | 308,368 | Mar 9, 2022 |
| Dun Haiping | — | Tax Withholding | 231 | $81.46 | $18,817 | 297,299 | Mar 2, 2022 |
| McKechnie Mark | See Remarks | Sale | 300 | $99.58 | $29,874 | 166 | Nov 18, 2021 |
| Feng Lisa | See remarks | Option Exercise | 2,437 | $5.60 | $13,647 | 16,667 | Nov 3, 2021 |
| Xiang Yinan | — | Sale | 33,000 | $86.08 | $2,840,640 | 1,357,799 | Aug 23, 2021 |