Data spanning the past 90 days through January 16, 2026 reveals that ACM Research's three principal insider shareholders consist of Director Yinan Xiang (3.44Mn shares), TenPercentOwner Science & Technology Venture Capital (Group) Co., Ltd. Shanghai (2.34Mn shares), Director Xiao Xing (2.34Mn shares).
| Holder | Position | Shares | Report Date |
|---|---|---|---|
| Xiao Xing | 2,338,510 | 08 Oct, 2024 | |
| Science & Technology Venture Capital (Group) Co., Ltd. Shanghai | 2,338,510 | 08 Oct, 2024 | |
| Yinan Xiang | 3,438,510 | 24 Aug, 2021 | |
| David H Wang | Nan | 802,708 | 05 Dec, 2025 |
| Jian Wang | See Remarks | 253,158 | 19 Sep, 2025 |
| Tracy Liu | 110,772 | 19 Sep, 2025 | |
| Sotheara Cheav | See Remarks | 100,002 | 19 Sep, 2025 |
| Chenming Hu | 100,002 | 19 Mar, 2025 | |
| Haiping Dun | 100,000 | 14 Nov, 2025 | |
| Lisa Feng | See Remarks | 50,001 | 14 Nov, 2025 |
| Mark Mckechnie | Nan | 900 | 08 Dec, 2025 |
* Please note that the shares above only reflect shares from the fund portfolio and the institutional portfolio. Shares from the personal portfolio are excluded from this Institutional Ownership Page. See these insiders' latest transactions here on Insider Page.
| Transaction Date | Insider Name | Security Class | Transaction Type | Shares Traded | Price | Shares Remaining | Ownership | Code |
|---|---|---|---|---|---|---|---|---|
| 08 Dec, 2025 | Mark Mckechnie | Class A Common Stock | A | 22,500 | $25.45 | 23,400 | D | M |
| 08 Dec, 2025 | Mark Mckechnie | Class A Common Stock | D | 22,500 | $35.45 | 900 | D | S |
| 04 Dec, 2025 | David H Wang | Class A Common Stock | A | 60,000 | $1.00 | 862,708 | D | M |
| 04 Dec, 2025 | David H Wang | Class A Common Stock | D | 19,817 | $33.52 | 842,891 | D | S |
| 04 Dec, 2025 | David H Wang | Class A Common Stock | D | 40,183 | $34.42 | 802,708 | D | S |
| 04 Dec, 2025 | Mark Mckechnie | Class A Common Stock | D | 996 | $34.26 | 900 | D | S |
| 04 Dec, 2025 | Mark Mckechnie | Class A Common Stock | D | 7,754 | $33.50 | 1,896 | D | S |
| 04 Dec, 2025 | Mark Mckechnie | Class A Common Stock | A | 8,750 | $4.55 | 9,650 | D | M |
| 03 Dec, 2025 | David H Wang | Class A Common Stock | D | 68,800 | $33.05 | 803,908 | D | S |
| 03 Dec, 2025 | David H Wang | Class A Common Stock | A | 70,000 | $1.00 | 872,708 | D | M |
| 03 Dec, 2025 | David H Wang | Class A Common Stock | D | 1,200 | $33.56 | 802,708 | D | S |
| 03 Dec, 2025 | Fuping Chen | Class A Common Stock | D | 300 | $33.57 | 0 | D | S |
| 03 Dec, 2025 | Fuping Chen | Class A Common Stock | D | 19,700 | $33.05 | 300 | D | S |
| 03 Dec, 2025 | Fuping Chen | Class A Common Stock | A | 20,000 | $1.77 | 20,000 | D | M |
| 02 Dec, 2025 | Fuping Chen | Class A Common Stock | D | 100,000 | $33.20 | 0 | D | S |
| 02 Dec, 2025 | Fuping Chen | Class A Common Stock | A | 100,000 | $1.77 | 100,000 | D | M |
| 13 Nov, 2025 | Lisa Feng | Class A Common Stock | A | 15,000 | $5.60 | 65,001 | D | M |
| 13 Nov, 2025 | Lisa Feng | Class A Common Stock | D | 15,000 | $33.77 | 50,001 | D | S |
| 12 Nov, 2025 | Haiping Dun | Class A Common Stock | D | 755,090 | $0.00 | 0 | D | G |
| 12 Nov, 2025 | Lisa Feng | Class A Common Stock | A | 15,000 | $5.60 | 65,001 | D | M |