| Investor | Value | Of portfolio | Shares | Change | Quarter |
|---|---|---|---|---|---|
| Renaissance Technologies | $29.2M | 0.04% | 229.80K | +87% | Q2 2026 |
| Soros Fund Management · George Soros | $3.8M | 0.05% | 30.12K | New | Q2 2026 |
| Maverick Capital · Lee Ainslie | $674.4K | 0.01% | 5.32K | New | Q2 2026 |
From each investor's quarterly 13F filing with the SEC: positions at the quarter's end, reported up to 45 days later. All investors
No member of Congress has disclosed a ACMR trade since 2025.
From House and Senate STOCK Act reports. Members disclose trades, not holdings, as value ranges up to 45 days later, so amounts are estimates and “last move” is a hint at who still holds it, not a position. All recent congress trades
| Date | Insider | Transaction | Shares | Value |
|---|---|---|---|---|
| Sep 8, 2026 | Wang David HuiOfficer, Director and Beneficial Owner | Sale at price 73.80 - 78.57 per share. | 140K | $10.63M |
| Sep 8, 2026 | Wang David HuiOfficer, Director and Beneficial Owner | Conversion of Exercise of derivative security at price 1.00 per share. | 140K | $140.00K |
| Aug 19, 2026 | Mckechnie Mark AChief Financial Officer | Sale at price 76.34 - 77.89 per share. | 55.2K | $4.26M |
| Aug 19, 2026 | Mckechnie Mark AChief Financial Officer | Conversion of Exercise of derivative security at price 13.89 - 19.49 per share. | 55.2K | $935.83K |
| Aug 17, 2026 | Dun HaipingDirector | Sale at price 80.29 - 82.17 per share. | 5K | $405.67K |
| Aug 17, 2026 | Dun HaipingDirector | Conversion of Exercise of derivative security at price 5.60 per share. | 5K | $28.00K |
| Jun 4, 2026 | Cheav SothearaOfficer | Sale at price 81.73 - 85.77 per share. | 18.8K | $1.59M |
| Jun 4, 2026 | Cheav SothearaOfficer | Conversion of Exercise of derivative security at price 13.89 per share. | 18.8K | $260.44K |
| Jun 3, 2026 | Wang David HuiChief Executive Officer | Sale at price 83.86 - 93.04 per share. | 100K | $8.84M |
| Jun 3, 2026 | Wang David HuiChief Executive Officer | Conversion of Exercise of derivative security at price 1.00 per share. | 100K | $100.00K |
| May 18, 2026 | Dun HaipingDirector | Sale at price 63.84 - 67.54 per share. | 5K | $331.11K |
| May 18, 2026 | Dun HaipingDirector | Conversion of Exercise of derivative security at price 5.60 per share. | 5K | $28.00K |
| Apr 16, 2026 | Pappis Charles CDirector | Sale at price 52.00 per share. | 5K | $260.00K |
| Apr 16, 2026 | Pappis Charles CDirector | Conversion of Exercise of derivative security at price 29.18 per share. | 5K | $145.90K |
| Mar 11, 2026 | Wang David HuiChief Executive Officer | Sale at price 44.92 - 48.34 per share. | 110K | $5.15M |
| Mar 11, 2026 | Wang David HuiChief Executive Officer | Conversion of Exercise of derivative security at price 1.00 per share. | 110K | $110.00K |
| Mar 11, 2026 | Mckechnie Mark AChief Financial Officer | Sale at price 44.89 - 46.57 per share. | 98.6K | $4.49M |
| Mar 11, 2026 | Mckechnie Mark AChief Financial Officer | Conversion of Exercise of derivative security at price 13.89 - 19.49 per share. | 98.6K | $1.58M |
| Mar 10, 2026 | Liu Tracy DongDirector | Sale at price 47.06 - 48.25 per share. | 60K | $2.85M |
| Mar 10, 2026 | Liu Tracy DongDirector | Conversion of Exercise of derivative security at price 1.00 per share. | 60K | $60.00K |
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Year |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | 47.3 | -4.2 | -29.3 | 31.4 | 67.5 | 46.6 | -38.2 | -7.2 | 11.1 | -15.8 | +72.6% | ||
| 2025 | 36.1 | 26.2 | -10.0 | -16.6 | 15.8 | 14.9 | 17.2 | -7.0 | 38.7 | 6.0 | -19.4 | 18.1 | +161.3% |
| 2024 | -11.9 | 79.6 | -5.8 | -12.4 | -15.4 | 6.8 | -22.2 | 0.5 | 12.5 | -7.4 | -8.5 | -12.2 | −22.7% |
| 2023 | 62.0 | -16.9 | 12.7 | -20.1 | 8.1 | 29.4 | 0.2 | 34.0 | 3.1 | -24.9 | 22.4 | 17.4 | +153.4% |
| 2022 | -6.6 | 3.5 | -24.7 | -27.0 | 0.3 | 11.0 | 0.3 | 0.1 | -26.2 | -48.6 | 41.6 | -14.9 | −72.9% |
| 2021 | 10.8 | 8.0 | -16.8 | -2.3 | -3.8 | 34.5 | -9.2 | -4.0 | 23.4 | -3.5 | -17.7 | -2.5 | +4.9% |
| 2020 | 88.3 | 0.6 | -15.3 | 34.9 | 49.7 | 4.3 | 53.8 | -7.4 | -22.2 | 1.8 | 17.4 | -1.7 | +340.4% |
| 2019 | -14.4 | 21.9 | 35.9 | 11.7 | 11.8 | -19.0 | 11.7 | -18.0 | -3.1 | -9.2 | 9.7 | 33.6 | +69.6% |
| 2018 | 2.3 | 26.6 | 80.9 | -17.9 | 25.8 | -15.2 | 20.2 | 8.9 | -21.5 | -13.7 | 16.8 | -2.4 | +107.2% |
| 2017 | -22.2 | −22.2% |
ACM Research, Inc., together with its subsidiaries, develops, manufactures, and sells capital equipment in Mainland China and internationally. It also develops, manufactures, and sells a range of packaging tools to wafer assembly and packaging customers. The company provides wet cleaning equipment for front end production processes; electrochemical plating, furnace, PECVD, and track platforms; Space Alternated Phase Shift, technology for flat and wafer surfaces; timely energized bubble oscillation, technology for patterned wafer surfaces at advanced process nodes; and Tahoe technology; and semi-critical cleaning tools. It also offers advanced packaging equipment, such as coaters, developers, photoresist strippers, scrubbers, wet etchers and copper-plating equipment; and advanced packaging products include: Ultra ECP ap, which delivers a uniform metal layer to finished wafers prior to packaging; Ultra C Developer, which applies liquid developer to selected parts of photoresist to resolve an image; Ultra C PR Megasonic-Assisted Stripper, which removes photoresist; Ultra C Scrubber, which scrubs and cleans wafers; Ultra C Thin Wafer Scrubber, which addresses a sub-market of cleaning very thin wafers for certain Asian assembly factories; and Ultra C Wet Etcher, which etches silicon wafers and copper and titanium interconnects. In addition, the company provides ECP technology for advanced metal plating; Ultra fn Furnace, a dry processing tool; Ultra Pmax PECVD tools, a proprietary designed chamber, gas distribution unit, and chuck; and Ultra Track, a 300mm process tool that delivers uniform air downflow, fast robot handling and configurable software to address specific customer requirements. It markets and sells its products under the SAPS, TEBO, ULTRA C, ULTRA Fn, Ultra ECP, Ultra ECP map, and Ultra ECP ap trademarks through direct sales force and third-party representatives. ACM Research, Inc. was incorporated in 1998 and is headquartered in Fremont, California.
Buy / hold / sell counts