SEC Form 4 · Updated Daily
ACMR
— ACM RESEARCH, INC. OwnershipInsider and institutional ownership derived from SEC Form 4 filings. Click any owner to see their holdings across every company they’ve filed on, and how their position has changed over time.
Current Reporting Owners
| Owner | Role | Shares Owned | As Of | Last Activity |
|---|---|---|---|---|
| Shanghai Pudong Science & Technology Investment Group Co., Ltd. | 10%+ Owner | 2,833,171 | 2024-10-04 | S |
| Shanghai Science & Technology Venture Capital (Group) Co., Ltd. | 10%+ Owner | 2,833,171 | 2024-10-04 | S |
| Xing Xiao | Director | 2,823,033 | 2024-10-04 | S |
| Xiang Yinan | Director | 1,390,799 | 2021-08-23 | S |
| Wang David H | 10%+ Owner · Director · Officer | 872,708 | 2026-09-08 | M |
| Yang Zhengfan | Director | 833,334 | 2018-01-08 | — |
| Wang Jian | Officer | 283,158 | 2025-09-18 | M |
| Liu Tracy | Director | 155,772 | 2026-03-10 | M |
| Chen Fufa | Officer | 129,583 | 2018-01-31 | M |
| Cheav Sotheara | Officer | 113,353 | 2026-06-04 | M |
| Hu Chenming | Director | 100,002 | 2025-03-17 | S |
| Chen Fuping | Officer | 100,000 | 2025-12-02 | M |
| Feng Lisa | Officer | 65,001 | 2026-03-05 | M |
| McKechnie Mark | Officer | 56,099 | 2026-08-20 | M |
| Pappis Charles C | Director | 5,000 | 2026-04-17 | M |
| Dun Haiping | Director | 5,000 | 2026-08-18 | M |
Recent Filings
| Date | Owner | Activity | Shares | Price | Owned After |
|---|---|---|---|---|---|
| 2026-09-09 | Wang David H | Option exercise (derivative) | 70,000 | $0.00 | 130,000 |
| 2026-09-09 | Wang David H | Open-market sale | 1,100 | $77.59 | 802,708 |
| 2026-09-09 | Wang David H | Open-market sale | 4,807 | $76.73 | 803,808 |
| 2026-09-09 | Wang David H | Open-market sale | 11,666 | $75.58 | 808,615 |
| 2026-09-09 | Wang David H | Open-market sale | 18,934 | $74.67 | 820,281 |
| 2026-09-09 | Wang David H | Open-market sale | 33,493 | $73.80 | 839,215 |
| 2026-09-09 | Wang David H | Option exercise | 70,000 | $1.00 | 872,708 |
| 2026-09-08 | Wang David H | Option exercise (derivative) | 70,000 | $0.00 | 200,000 |
| 2026-09-08 | Wang David H | Open-market sale | 1,500 | $78.57 | 802,708 |
| 2026-09-08 | Wang David H | Open-market sale | 12,323 | $78.08 | 804,208 |
| 2026-09-08 | Wang David H | Open-market sale | 51,374 | $77.15 | 816,531 |
| 2026-09-08 | Wang David H | Open-market sale | 4,803 | $75.99 | 867,905 |
| 2026-09-08 | Wang David H | Option exercise | 70,000 | $1.00 | 872,708 |
| 2026-08-20 | McKechnie Mark | Option exercise (derivative) | 25,000 | $0.00 | 215,000 |
| 2026-08-20 | McKechnie Mark | Option exercise (derivative) | 30,199 | $0.00 | 31,250 |
| 2026-08-20 | McKechnie Mark | Open-market sale | 11,209 | $77.89 | 900 |
| 2026-08-20 | McKechnie Mark | Open-market sale | 30,365 | $77.45 | 12,109 |
| 2026-08-20 | McKechnie Mark | Open-market sale | 13,625 | $76.34 | 42,474 |
| 2026-08-20 | McKechnie Mark | Option exercise | 25,000 | $13.89 | 56,099 |
| 2026-08-20 | McKechnie Mark | Option exercise | 30,199 | $19.49 | 31,099 |
| 2026-08-18 | Dun Haiping | Option exercise (derivative) | 5,000 | $0.00 | 45,000 |
| 2026-08-18 | Dun Haiping | Open-market sale | 400 | $82.17 | 0 |
| 2026-08-18 | Dun Haiping | Open-market sale | 3,400 | $81.31 | 400 |
| 2026-08-18 | Dun Haiping | Open-market sale | 1,200 | $80.29 | 3,800 |
| 2026-08-18 | Dun Haiping | Option exercise | 5,000 | $5.60 | 5,000 |
| 2026-08-12 | Dun Haiping | Grant / award (derivative) | 728 | $0.00 | 728 |
| 2026-08-12 | Dun Haiping | Grant / award (derivative) | 6,400 | $0.00 | 6,400 |
| 2026-08-12 | Liu Tracy | Grant / award (derivative) | 728 | $0.00 | 728 |
| 2026-08-12 | Liu Tracy | Grant / award (derivative) | 6,400 | $0.00 | 6,400 |
| 2026-08-12 | Pappis Charles C | Grant / award (derivative) | 728 | $0.00 | 728 |
| 2026-08-12 | Pappis Charles C | Grant / award (derivative) | 6,400 | $0.00 | 6,400 |
| 2026-06-05 | Cheav Sotheara | Option exercise (derivative) | 5,399 | $0.00 | 37,500 |
| 2026-06-05 | Cheav Sotheara | Open-market sale | 1,647 | $85.41 | 100,002 |
| 2026-06-05 | Cheav Sotheara | Open-market sale | 400 | $84.01 | 101,649 |
| 2026-06-05 | Cheav Sotheara | Open-market sale | 968 | $82.61 | 102,049 |
| 2026-06-05 | Cheav Sotheara | Open-market sale | 2,384 | $81.73 | 103,017 |
| 2026-06-05 | Cheav Sotheara | Option exercise | 5,399 | $13.89 | 105,401 |
| 2026-06-04 | Wang David H | Option exercise (derivative) | 40,002 | $0.00 | 270,000 |
| 2026-06-04 | Wang David H | Open-market sale | 826 | $87.91 | 802,708 |
| 2026-06-04 | Wang David H | Open-market sale | 8,581 | $87.13 | 803,534 |
Source: SEC EDGAR Form 4 filings. For informational purposes only — not investment advice.