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ACM Research, Inc.

ACMR
Exchange
Nasdaq
Industry
Special Industry Machinery, NEC
SEC CIK
0001680062

In the last 90 days, ACM Research, Inc. insiders filed 0 open-market purchases and 3 sales; 377 institutions reported holding it in 13F filings for Q2 2026, worth $6.13B in total; 3 superinvestors hold it, including Southeastern Asset Management (Longleaf) and Soros Fund Management.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by ACM Research, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
3 filings
3 insiders, $15.3M in total
Insiders trading
3
Net value
−$15.3M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for ACM Research, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for ACM Research, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Wang David HSee Remarks802,708Sep 10, 20268
Pappis Charles CDirector0Aug 26, 20263
Liu TracyDirector110,772Aug 26, 20262
Dun HaipingDirector0Aug 26, 20265
McKechnie MarkSee Remarks900Aug 21, 20263
Cheav SothearaSee remarks100,002Jun 5, 20261
Feng LisaSee remarks50,001Mar 9, 20262
Chen FupingSee remarks0Dec 4, 20251
Wang JianSee remarks253,158Sep 19, 20250
Hu ChenmingDirector100,002Mar 19, 20250
Shanghai Pudong Science & Technology Investment Group Co., Ltd.10% Owner, Other: Possible member of 10% group2,338,510Oct 8, 20240
Shanghai Science & Technology Venture Capital (Group) Co., Ltd.10% Owner, Other: Possible member of 10% group2,338,510Oct 8, 20240
Xing XiaoDirector2,338,510IndirectOct 8, 20240
Xiang YinanDirector1,146,170IndirectAug 24, 20210

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 10, 2026 (view filing)4:30 PM ETSep 8-92 daysWang David HSee RemarksSSaleClass A Common Stock−140.0K$75.93−$10.6M−14.9%802.7K after9 lots10b5-1
Aug 21, 2026 (view filing)9:30 PM ETAug 201 dayMcKechnie MarkSee RemarksSSaleClass A Common Stock−55.2K$77.27−$4.26M−98.4%900 after3 lots10b5-1
Aug 20, 2026 (view filing)4:30 PM ETAug 182 daysDun HaipingDirectorSSaleClass A Common Stock−5.00K$81.13−$405.7K−100.0%0 after3 lots10b5-1
Jun 5, 2026 (view filing)Jun 4-51 dayCheav SothearaSee remarksSSaleClass A Common Stock−18.8K$84.58−$1.59M−15.8%100.0K after7 lots10b5-1
Jun 5, 2026 (view filing)Jun 3-42 daysWang David HSee RemarksSSaleClass A Common Stock−100.0K$88.35−$8.84M−11.1%802.7K after11 lots10b5-1
May 21, 2026 (view filing)May 192 daysDun HaipingDirectorSSaleClass A Common Stock−5.00K$66.22−$331.1K−100.0%0 after4 lots10b5-1
Apr 21, 2026 (view filing)Apr 174 daysPappis Charles CDirectorSSaleClass A Common Stock−5.00K$52.00−$260.0K−100.0%0 after10b5-1
Mar 13, 2026 (view filing)Mar 121 dayMcKechnie MarkSee RemarksSSaleClass A Common Stock−98.6K$45.58−$4.49M−99.1%900 after6 lots10b5-1
Mar 13, 2026 (view filing)Mar 11-122 daysWang David HSee RemarksSSaleClass A Common Stock−110.0K$46.86−$5.15M−12.1%802.7K after5 lots10b5-1
Mar 12, 2026 (view filing)Mar 10-112 daysLiu TracyDirectorSSaleClass A Common Stock−60.0K$47.51−$2.85M−35.1%110.8K after4 lots10b5-1
Mar 11, 2026 (view filing)Mar 92 daysDun HaipingDirectorSSaleClass A Common Stock−5.00K$43.47−$217.4K−100.0%0 after2 lots10b5-1
Mar 9, 2026 (view filing)Mar 54 daysPappis Charles CDirectorSSaleClass A Common Stock−5.00K$50.09−$250.4K−100.0%0 after10b5-1
Mar 9, 2026 (view filing)Mar 5-64 daysFeng LisaSee remarksSSaleClass A Common Stock−30.0K$48.04−$1.44M−37.5%50.0K after4 lots10b5-1
Dec 8, 2025 (view filing)Dec 4-84 daysMcKechnie MarkSee RemarksSSaleClass A Common Stock−31.3K$34.93−$1.09M−97.2%900 after3 lots10b5-1
Dec 5, 2025 (view filing)Dec 3-42 daysWang David HSee RemarksSSaleClass A Common Stock−130.0K$33.55−$4.36M−13.9%802.7K after4 lots10b5-1
Dec 4, 2025 (view filing)Dec 2-32 daysChen FupingSee remarksSSaleClass A Common Stock−120.0K$33.18−$3.98M−100.0%0 after3 lots10b5-1
Nov 14, 2025 (view filing)Nov 12-132 daysFeng LisaSee remarksSSaleClass A Common Stock−30.0K$33.27−$998.0K−37.5%50.0K after2 lots10b5-1
Sep 19, 2025 (view filing)Sep 181 dayCheav SothearaSee remarksSSaleClass A Common Stock−10.0K$35.00−$350.0K−9.1%100.0K after10b5-1
Sep 19, 2025 (view filing)Sep 172 daysLiu TracyDirectorSSaleClass A Common Stock−15.0K$33.00−$495.0K−11.9%110.8K after10b5-1
Sep 19, 2025 (view filing)Sep 181 dayWang JianSee remarksSSaleClass A Common Stock−30.0K$35.00−$1.05M−10.6%253.2K after10b5-1
Sep 5, 2025 (view filing)Sep 3-42 daysWang David HSee RemarksSSaleClass A Common Stock−130.0K$26.61−$3.46M−16.2%672.7K after3 lots10b5-1
Aug 26, 2025 (view filing)Aug 224 daysCheav SothearaSee remarksSSaleClass A Common Stock−11.2K$30.00−$334.6K−10.0%100.0K after10b5-1
Aug 26, 2025 (view filing)Aug 22-254 daysWang JianSee remarksSSaleClass A Common Stock−60.0K$31.00−$1.86M−19.2%253.2K after2 lots10b5-1
Jul 17, 2025 (view filing)Jul 152 daysLiu TracyDirectorSSaleClass A Common Stock−15.0K$30.00−$450.0K−11.9%110.8K after10b5-1
Jul 9, 2025 (view filing)Jul 72 daysFeng LisaSee remarksSSaleClass A Common Stock−15.0K$28.00−$420.0K−23.1%50.0K after10b5-1
Jun 26, 2025 (view filing)Jun 242 daysFeng LisaSee remarksSSaleClass A Common Stock−15.0K$26.00−$390.0K−23.1%50.0K after10b5-1
May 23, 2025 (view filing)May 21-222 daysWang David HSee RemarksSSaleClass A Common Stock−130.0K$23.15−$3.01M−16.2%672.7K after3 lots10b5-1
May 16, 2025 (view filing)May 142 daysMcKechnie MarkSee RemarksSSaleClass A Common Stock−15.0K$25.22−$378.3K−94.3%900 after10b5-1
Mar 19, 2025 (view filing)Mar 172 daysHu ChenmingDirectorSSaleClass A Common Stock−163.3K$30.00−$4.90M−62.0%100.0K after10b5-1
Mar 18, 2025 (view filing)Mar 144 daysDun HaipingDirectorSSaleClass A Common Stock−9.52K$29.00−$276.0K−1.2%755.1K after2 lots10b5-1
Mar 14, 2025 (view filing)Mar 122 daysMcKechnie MarkSee RemarksSSaleClass A Common Stock−15.0K$27.42−$411.3K−94.3%900 after10b5-1
Mar 13, 2025 (view filing)Mar 11-132 daysWang David HSee RemarksSSaleClass A Common Stock−131.3K$27.02−$3.55M−16.3%672.7K after4 lots10b5-1
Mar 12, 2025 (view filing)Mar 102 daysDun HaipingDirectorSSaleClass A Common Stock−15.0K$26.54−$398.1K−1.9%764.6K after10b5-1
Feb 10, 2025 (view filing)Feb 64 daysCheav SothearaSee remarksSSaleClass A Common Stock−22.6K$23.00−$519.8K−18.4%100.0K after10b5-1
Feb 10, 2025 (view filing)Feb 64 daysMcKechnie MarkSee RemarksSSaleClass A Common Stock−15.0K$22.00−$330.0K−94.3%900 after10b5-1
Dec 3, 2024 (view filing)Nov 294 daysDun HaipingDirectorSSaleClass A Common Stock−19.1K$17.43−$332.2K−2.5%755.1K after10b5-1
Dec 3, 2024 (view filing)Nov 294 daysWang David HSee RemarksSSaleClass A Common Stock−56.3K$17.44−$981.0K−8.6%598.0K after10b5-1
Nov 29, 2024 (view filing)Nov 263 daysWang David HSee RemarksSSaleClass A Common Stock−56.3K$17.89−$1.01M−7.9%654.3K after2 lots10b5-1
Nov 26, 2024 (view filing)Nov 224 daysDun HaipingDirectorSSaleClass A Common Stock−15.0K$19.12−$286.8K−1.9%774.1K after10b5-1
Nov 26, 2024 (view filing)Nov 224 daysWang David HSee RemarksSSaleClass A Common Stock−56.3K$19.08−$1.07M−7.3%710.5K after10b5-1
Oct 8, 2024 (view filing)9:37 PM ETOct 4-84 daysShanghai Pudong Science & Technology Investment Group Co., Ltd. and 1 other10% Owner, Other: Possible member of 10% groupSSaleClass A Common Stock, $0.0001 par value−1.07M$22.08−$23.5M−31.3%2.34M after6 lots10b5-1
Oct 8, 2024 (view filing)Oct 4-84 daysXing XiaoDirectorSSaleClass A Common Stock−1.07M$22.07−$23.5M−31.3%2.34M after6 lots10b5-1
Oct 8, 2024 (view filing)Oct 44 daysMcKechnie MarkSee RemarksSSaleClass A Common Stock−16.5K$22.00−$363.4K−94.8%900 after10b5-1
Oct 3, 2024 (view filing)9:58 PM ETOct 1-22 daysShanghai Pudong Science & Technology Investment Group Co., Ltd. and 1 other10% Owner, Other: Possible member of 10% groupSSaleClass A Common Stock, $0.0001 par value−34.6K$20.05−$693.9K−1.0%3.40M after2 lots10b5-1Duplicate filing
Oct 3, 2024 (view filing)Oct 1-22 daysXing XiaoDirectorSSaleClass A Common Stock−34.6K$20.05−$693.9K−1.0%3.40M after2 lots10b5-1
Sep 3, 2024 (view filing)Aug 295 daysDun HaipingDirectorSSaleClass A Common Stock−19.1K$18.08−$345.3K−2.5%755.1K after10b5-1
Aug 26, 2024 (view filing)Aug 224 daysDun HaipingDirectorSSaleClass A Common Stock−15.0K$19.85−$297.8K−1.9%774.2K after10b5-1
Jun 12, 2024 (view filing)Jun 10-112 daysWang JianSee remarksSSaleClass A Common Stock−60.0K$22.54−$1.35M−19.2%253.2K after3 lots10b5-1
Jun 7, 2024 (view filing)Jun 6-71 dayWang JianSee remarksSSaleClass A Common Stock−60.0K$22.50−$1.35M−19.2%253.2K after2 lots10b5-1
Jun 7, 2024 (view filing)Jun 61 dayMcKechnie MarkSee RemarksSSaleClass A Common Stock−20.0K$22.92−$458.4K−95.7%900 after2 lots10b5-1