ACM Research, Inc. (ACMR) Insider Ownership

Historic Insider Ownership Trends

ACMR's three largest insider shareholders as of April 25, 2026 are Xiao Xing (Director, 2.34Mn shares), Science Technology Venture Capital (Group) Co., Ltd. Shanghai (TenPercentOwner, 2.34Mn shares), Science Technology Venture Capital (Group) Co., Ltd. Shanghai (TenPercentOwner, 2.34Mn shares).

Top Direct Holders

Insider ownership data is derived from the last 60 months of Form 4 SEC filings.
Holder Position Shares (Direct) Shares (Indirect) Report Date
Xiao Xing - 0 2,338,510 08 Oct, 2024
Xiao Xing - 0 2,338,510 08 Oct, 2024
Science Technology Venture Capital (Group) Co., Ltd. Shanghai - 2,338,510 0 08 Oct, 2024
Science Technology Venture Capital (Group) Co., Ltd. Shanghai - 2,338,510 0 08 Oct, 2024
Yinan Xiang - 0 1,146,170 24 Aug, 2021
Yinan Xiang - 0 1,146,170 24 Aug, 2021
David H Wang - 802,708 0 13 Mar, 2026
David H Wang - 802,708 0 13 Mar, 2026
Jian Wang - 253,158 0 19 Sep, 2025
Jian Wang - 253,158 0 19 Sep, 2025
Tracy Liu - 110,772 0 12 Mar, 2026
Tracy Liu - 110,772 0 12 Mar, 2026
Sotheara Cheav - 100,002 0 19 Sep, 2025
Chenming Hu - 100,002 0 19 Mar, 2025
Sotheara Cheav - 100,002 0 19 Sep, 2025
Chenming Hu - 100,002 0 19 Mar, 2025
Lisa Feng - 50,001 0 09 Mar, 2026
Lisa Feng - 50,001 0 09 Mar, 2026
Mark Mckechnie - 900 0 13 Mar, 2026
Mark Mckechnie - 900 0 13 Mar, 2026

* 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.

Recent Insider Transactions

Detailed insider trading activity based on Form 4 SEC filings.
Download Data
Transaction Date Insider Name Security Class Transaction Type Shares Traded Price Shares Remaining Ownership Code
17 Apr, 2026 Charles C Pappis Class A Common Stock A 5,000 $29.18 5,000 D M
17 Apr, 2026 Charles C Pappis Class A Common Stock D 5,000 $52.00 0 D S
17 Apr, 2026 Charles C Pappis Stock Option D 5,000 $0.00 0 D M
12 Mar, 2026 Mark Mckechnie Class A Common Stock A 60,000 $13.89 60,900 D M
12 Mar, 2026 Mark Mckechnie Class A Common Stock A 60,000 $13.89 60,900 D M
11 Mar, 2026 David H Wang Class A Common Stock A 60,000 $1.00 862,708 D M
11 Mar, 2026 David H Wang Class A Common Stock A 60,000 $1.00 862,708 D M
12 Mar, 2026 Mark Mckechnie Class A Common Stock D 11,910 $44.89 48,990 D S
11 Mar, 2026 David H Wang Class A Common Stock D 55,373 $47.89 807,335 D S
11 Mar, 2026 David H Wang Class A Common Stock D 55,373 $47.89 807,335 D S
12 Mar, 2026 Mark Mckechnie Class A Common Stock D 11,910 $44.89 48,990 D S
12 Mar, 2026 Mark Mckechnie Class A Common Stock D 47,108 $45.74 1,882 D S
12 Mar, 2026 Mark Mckechnie Class A Common Stock D 47,108 $45.74 1,882 D S
11 Mar, 2026 David H Wang Class A Common Stock D 4,627 $48.34 802,708 D S
11 Mar, 2026 David H Wang Class A Common Stock D 4,627 $48.34 802,708 D S
12 Mar, 2026 Mark Mckechnie Class A Common Stock D 982 $46.55 900 D S
12 Mar, 2026 Mark Mckechnie Class A Common Stock D 982 $46.55 900 D S
12 Mar, 2026 David H Wang Class A Common Stock A 50,000 $1.00 852,708 D M
12 Mar, 2026 David H Wang Class A Common Stock A 50,000 $1.00 852,708 D M
12 Mar, 2026 Mark Mckechnie Class A Common Stock A 38,551 $19.49 39,451 D M