Nasdaq · CIK 0001680062
ACMR ACM Research, Inc.
Insider trading from SEC Form 4. Last filing 32 d ago. Close $71.37 on Oct 9, 2026, +141% from the 52-week low and -44% from the high.
Last 90 days
Net insider value
-$11M
more sold than bought
Buys
0
$0 by 0 insiders
Sells
1
$11M by 1 insider
Insiders on file
10
with a Form 4 at this company
Price and insider trades, last year
ACMROct 9, 2026 · close 71.37
Daily candles, adjusted for splits and dividends. Green arrows are insider buys, red are sells, sized by value. Click a marked bar to open the signal.Charts by TradingView Lightweight Charts™
Signals
Open-market buys and sells at ACM Research, Inc., scored.
| Score | Insider | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 10Weak | David H Wang See Remarks sell | $11M 140,000 shares | -16% | +185% from low-39% from high | |
| 40Moderate | Mark McKechnie See Remarks sell | $1.1M 31,250 shares | -324% | +146% from low-21% from high | |
| 25Weak | David H Wang See Remarks sell | $4.4M 130,000 shares | -15% | +141% from low-22% from high | |
| 40Moderate | Fuping Chen See remarks sell | $4.0M 120,000 shares | -120% | +133% from low-25% from high | |
| 15Weak | Lisa Feng See remarks sell | $998k 30,000 shares | -46% | +140% from low-23% from high | |
| 25Weak | Jian Wang See remarks sell | $1.1M 30,000 shares | -11% | +156% from low0% from high | |
| 18Weak | Tracy Liu director sell | $495k 15,000 shares | -12% | +139% from low0% from high | |
| 10Weak | Sotheara Cheav See remarks sell | $350k 10,000 shares | -9% | +156% from low0% from high | |
| 25Weak | David H Wang See Remarks sell | $3.5M 130,000 shares | -18% | +90% from low-16% from high | |
| 25Weak | Jian Wang See remarks sell | $1.9M 60,000 shares | -21% | +117% from low-5% from high | |
| 15Weak | Sotheara Cheav See remarks sell | $335k 11,152 shares | -10% | +117% from low-5% from high | |
| 10Weak | Tracy Liu director sell | $450k 15,000 shares | -12% | +109% from low-2% from high | |
| 9Weak | Lisa Feng See remarks sell | $420k 15,000 shares | -23% | +98% from low-7% from high | |
| 1Weak | Lisa Feng See remarks sell | $390k 15,000 shares | -23% | +86% from low-13% from high | |
| 18Weak | David H Wang See Remarks sell | $3.0M 130,000 shares | -18% | +63% from low-23% from high | |
| 24Weak | Mark McKechnie See Remarks sell | $378k 15,000 shares | -94% | +78% from low-16% from high | |
| 55Moderate | Chenming Hu director sell | $4.9M 163,308 shares | -62% | +113% from low0% from high | |
| 24Weak | Haiping Dun director sell | $276k 9,518 shares | -1% | +107% from low0% from high | |
| 31Weak | Mark McKechnie See Remarks sell | $411k 15,000 shares | -94% | +95% from low-1% from high | |
| 40Moderate | David H Wang See Remarks sell | $3.5M 131,250 shares | -16% | +92% from low-2% from high | |
| 26Weak | Haiping Dun director sell | $398k 15,001 shares | -2% | +85% from low-6% from high | |
| 23Weak | Mark McKechnie See Remarks sell | $330k 15,000 shares | -94% | +63% from low-2% from high | |
| 11Weak | Sotheara Cheav See remarks sell | $520k 22,598 shares | -18% | +63% from low-2% from high | |
| 28Weak | David H Wang See Remarks sell | $981k 56,250 shares | -9% | - | |
| 18Weak | Haiping Dun director sell | $332k 19,058 shares | -2% | - | |
| 28Weak | David H Wang See Remarks sell | $1.0M 56,250 shares | -8% | - | |
| 28Weak | David H Wang See Remarks sell | $1.1M 56,250 shares | -7% | - | |
| 17Weak | Haiping Dun director sell | $287k 15,000 shares | -2% | - |
Transactions
The last 100 rows filed, every code.
| Date | Insider | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| Sep 8, 2026 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +70,000 | $1.00 | $70k | 872,708 | 32 d ago |
| Sep 8, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -4,803 | $75.99 | $365k | 867,905 | 32 d ago |
| Sep 8, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -51,374 | $77.15 | $4.0M | 816,531 | 32 d ago |
| Sep 8, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -12,323 | $78.08 | $962k | 804,208 | 32 d ago |
| Sep 8, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -1,500 | $78.57 | $118k | 802,708 | 32 d ago |
| Sep 9, 2026 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +70,000 | $1.00 | $70k | 872,708 | 32 d ago |
| Sep 9, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -33,493 | $73.80 | $2.5M | 839,215 | 32 d ago |
| Sep 9, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -18,934 | $74.67 | $1.4M | 820,281 | 32 d ago |
| Sep 9, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -11,666 | $75.58 | $882k | 808,615 | 32 d ago |
| Sep 9, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -4,807 | $76.73 | $369k | 803,808 | 32 d ago |
| Sep 9, 2026 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -1,100 | $77.59 | $85k | 802,708 | 32 d ago |
| Sep 8, 2026 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -70,000 | $0.00 | $0 | 200,000 | 32 d ago |
| Sep 9, 2026 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -70,000 | $0.00 | $0 | 130,000 | 32 d ago |
| Dec 4, 2025 | Mark McKechnie See Remarks | MOption exercise Class A Common Stock10b5-1 | +8,750 | $4.55 | $40k | 9,650 | Dec 8, 2025 |
| Dec 4, 2025 | Mark McKechnie See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -7,754 | $33.50 | $260k | 1,896 | Dec 8, 2025 |
| Dec 4, 2025 | Mark McKechnie See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -996 | $34.26 | $34k | 900 | Dec 8, 2025 |
| Dec 8, 2025 | Mark McKechnie See Remarks | MOption exercise Class A Common Stock10b5-1 | +22,500 | $25.45 | $573k | 23,400 | Dec 8, 2025 |
| Dec 8, 2025 | Mark McKechnie See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -22,500 | $35.45 | $798k | 900 | Dec 8, 2025 |
| Dec 4, 2025 | Mark McKechnie See Remarks | MOption exercise Stock Optionderivative10b5-1 | -8,750 | $0.00 | $0 | 0 | Dec 8, 2025 |
| Dec 8, 2025 | Mark McKechnie See Remarks | MOption exercise Stock Optionderivative10b5-1 | -22,500 | $0.00 | $0 | 0 | Dec 8, 2025 |
| Dec 3, 2025 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +70,000 | $1.00 | $70k | 872,708 | Dec 5, 2025 |
| Dec 3, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -68,800 | $33.05 | $2.3M | 803,908 | Dec 5, 2025 |
| Dec 3, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -1,200 | $33.56 | $40k | 802,708 | Dec 5, 2025 |
| Dec 4, 2025 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +60,000 | $1.00 | $60k | 862,708 | Dec 5, 2025 |
| Dec 4, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -19,817 | $33.52 | $664k | 842,891 | Dec 5, 2025 |
| Dec 4, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -40,183 | $34.42 | $1.4M | 802,708 | Dec 5, 2025 |
| Dec 3, 2025 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -70,000 | $0.00 | $0 | 540,002 | Dec 5, 2025 |
| Dec 4, 2025 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -60,000 | $0.00 | $0 | 480,002 | Dec 5, 2025 |
| Dec 2, 2025 | Fuping Chen See remarks | MOption exercise Class A Common Stock10b5-1 | +100,000 | $1.77 | $177k | 100,000 | Dec 4, 2025 |
| Dec 2, 2025 | Fuping Chen See remarks | SOpen-market sale Class A Common Stock10b5-1 | -100,000 | $33.20 | $3.3M | 0 | Dec 4, 2025 |
| Dec 3, 2025 | Fuping Chen See remarks | MOption exercise Class A Common Stock10b5-1 | +20,000 | $1.77 | $35k | 20,000 | Dec 4, 2025 |
| Dec 3, 2025 | Fuping Chen See remarks | SOpen-market sale Class A Common Stock10b5-1 | -19,700 | $33.05 | $651k | 300 | Dec 4, 2025 |
| Dec 3, 2025 | Fuping Chen See remarks | SOpen-market sale Class A Common Stock10b5-1 | -300 | $33.57 | $10k | 0 | Dec 4, 2025 |
| Dec 2, 2025 | Fuping Chen See remarks | MOption exercise Stock Optionderivative10b5-1 | -100,000 | $0.00 | $0 | 41,165 | Dec 4, 2025 |
| Dec 3, 2025 | Fuping Chen See remarks | MOption exercise Stock Optionderivative10b5-1 | -20,000 | $0.00 | $0 | 21,165 | Dec 4, 2025 |
| Nov 12, 2025 | Lisa Feng See remarks | MOption exercise Class A Common Stock10b5-1 | +15,000 | $5.60 | $84k | 65,001 | Nov 14, 2025 |
| Nov 12, 2025 | Haiping Dun director | GGift Class A Common Stock | -755,090 | $0.00 | $0 | 0 | Nov 14, 2025 |
| Nov 12, 2025 | Lisa Feng See remarks | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $32.76 | $491k | 50,001 | Nov 14, 2025 |
| Nov 13, 2025 | Lisa Feng See remarks | MOption exercise Class A Common Stock10b5-1 | +15,000 | $5.60 | $84k | 65,001 | Nov 14, 2025 |
| Nov 13, 2025 | Lisa Feng See remarks | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $33.77 | $507k | 50,001 | Nov 14, 2025 |
| Nov 12, 2025 | Lisa Feng See remarks | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 15,000 | Nov 14, 2025 |
| Nov 13, 2025 | Lisa Feng See remarks | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 0 | Nov 14, 2025 |
| Oct 27, 2025 | David H Wang See Remarks | AGrant or award Stock Optionderivative | +545,400 | $0.00 | $0 | 545,400 | Oct 29, 2025 |
| Sep 8, 2025 | David H Wang See Remarks | MOption exercise Class A Common Stock | +130,000 | $1.00 | $130k | 802,708 | Sep 30, 2025 |
| Sep 8, 2025 | David H Wang See Remarks | MOption exercise Stock Optionderivative | -130,000 | $0.00 | $0 | 610,002 | Sep 30, 2025 |
| Sep 18, 2025 | Jian Wang See remarks | MOption exercise Class A Common Stock10b5-1 | +30,000 | $5.60 | $168k | 283,158 | Sep 19, 2025 |
| Sep 18, 2025 | Sotheara Cheav See remarks | MOption exercise Class A Common Stock10b5-1 | +10,000 | $13.89 | $139k | 110,002 | Sep 19, 2025 |
| Sep 17, 2025 | Tracy Liu director | MOption exercise Class A Common Stock10b5-1 | +15,000 | $1.00 | $15k | 125,772 | Sep 19, 2025 |
| Sep 18, 2025 | Jian Wang See remarks | SOpen-market sale Class A Common Stock10b5-1 | -30,000 | $35.00 | $1.1M | 253,158 | Sep 19, 2025 |
| Sep 18, 2025 | Sotheara Cheav See remarks | SOpen-market sale Class A Common Stock10b5-1 | -10,000 | $35.00 | $350k | 100,002 | Sep 19, 2025 |
| Sep 17, 2025 | Tracy Liu director | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $33.00 | $495k | 110,772 | Sep 19, 2025 |
| Sep 18, 2025 | Jian Wang See remarks | MOption exercise Stock Optionderivative10b5-1 | -30,000 | $0.00 | $0 | 0 | Sep 19, 2025 |
| Sep 18, 2025 | Sotheara Cheav See remarks | MOption exercise Stock Optionderivative10b5-1 | -10,000 | $0.00 | $0 | 56,250 | Sep 19, 2025 |
| Sep 17, 2025 | Tracy Liu director | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 60,000 | Sep 19, 2025 |
| Sep 3, 2025 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +70,000 | $1.00 | $70k | 742,708 | Sep 5, 2025 |
| Sep 3, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -66,057 | $26.73 | $1.8M | 676,651 | Sep 5, 2025 |
| Sep 3, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -3,943 | $27.31 | $108k | 672,708 | Sep 5, 2025 |
| Sep 4, 2025 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +60,000 | $1.00 | $60k | 732,708 | Sep 5, 2025 |
| Sep 4, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -60,000 | $26.44 | $1.6M | 672,708 | Sep 5, 2025 |
| Sep 3, 2025 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -70,000 | $0.00 | $0 | 800,002 | Sep 5, 2025 |
| Sep 4, 2025 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -60,000 | $0.00 | $0 | 740,002 | Sep 5, 2025 |
| Aug 22, 2025 | Jian Wang See remarks | MOption exercise Class A Common Stock10b5-1 | +30,000 | $5.60 | $168k | 283,158 | Aug 26, 2025 |
| Aug 22, 2025 | Sotheara Cheav See remarks | MOption exercise Class A Common Stock10b5-1 | +11,152 | $13.89 | $155k | 111,154 | Aug 26, 2025 |
| Aug 22, 2025 | Jian Wang See remarks | SOpen-market sale Class A Common Stock10b5-1 | -30,000 | $30.00 | $900k | 253,158 | Aug 26, 2025 |
| Aug 22, 2025 | Sotheara Cheav See remarks | SOpen-market sale Class A Common Stock10b5-1 | -11,152 | $30.00 | $335k | 100,002 | Aug 26, 2025 |
| Aug 22, 2025 | Sotheara Cheav See remarks | MOption exercise Stock Optionderivative10b5-1 | -11,152 | $0.00 | $0 | 66,250 | Aug 26, 2025 |
| Aug 25, 2025 | Jian Wang See remarks | MOption exercise Class A Common Stock10b5-1 | +30,000 | $5.60 | $168k | 283,158 | Aug 26, 2025 |
| Aug 25, 2025 | Jian Wang See remarks | SOpen-market sale Class A Common Stock10b5-1 | -30,000 | $32.00 | $960k | 253,158 | Aug 26, 2025 |
| Aug 22, 2025 | Jian Wang See remarks | MOption exercise Stock Optionderivative10b5-1 | -30,000 | $0.00 | $0 | 60,000 | Aug 26, 2025 |
| Aug 25, 2025 | Jian Wang See remarks | MOption exercise Stock Optionderivative10b5-1 | -30,000 | $0.00 | $0 | 30,000 | Aug 26, 2025 |
| Aug 12, 2025 | Tracy Liu director | AGrant or award Stock Optionderivative | +20,000 | $0.00 | $0 | 20,000 | Aug 14, 2025 |
| Aug 12, 2025 | Haiping Dun director | AGrant or award Stock Optionderivative | +20,000 | $0.00 | $0 | 20,000 | Aug 14, 2025 |
| Aug 12, 2025 | Charles C Pappis director | AGrant or award Stock Optionderivative | +20,000 | $0.00 | $0 | 20,000 | Aug 14, 2025 |
| Jul 15, 2025 | Tracy Liu director | MOption exercise Class A Common Stock10b5-1 | +15,000 | $1.00 | $15k | 125,772 | Jul 17, 2025 |
| Jul 15, 2025 | Tracy Liu director | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $30.00 | $450k | 110,772 | Jul 17, 2025 |
| Jul 15, 2025 | Tracy Liu director | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 75,000 | Jul 17, 2025 |
| Jul 7, 2025 | Lisa Feng See remarks | MOption exercise Class A Common Stock10b5-1 | +15,000 | $5.60 | $84k | 65,001 | Jul 9, 2025 |
| Jul 7, 2025 | Lisa Feng See remarks | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $28.00 | $420k | 50,001 | Jul 9, 2025 |
| Jul 7, 2025 | Lisa Feng See remarks | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 30,000 | Jul 9, 2025 |
| Jun 24, 2025 | Lisa Feng See remarks | MOption exercise Class A Common Stock10b5-1 | +15,000 | $5.60 | $84k | 65,001 | Jun 26, 2025 |
| Jun 24, 2025 | Lisa Feng See remarks | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $26.00 | $390k | 50,001 | Jun 26, 2025 |
| Jun 24, 2025 | Lisa Feng See remarks | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 45,000 | Jun 26, 2025 |
| May 21, 2025 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +70,000 | $1.00 | $70k | 742,708 | May 23, 2025 |
| May 21, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -69,992 | $23.60 | $1.7M | 672,716 | May 23, 2025 |
| May 21, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -8 | $24.04 | $192 | 672,708 | May 23, 2025 |
| May 22, 2025 | David H Wang See Remarks | MOption exercise Class A Common Stock10b5-1 | +60,000 | $1.00 | $60k | 732,708 | May 23, 2025 |
| May 22, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -60,000 | $22.63 | $1.4M | 672,708 | May 23, 2025 |
| May 21, 2025 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -70,000 | $0.00 | $0 | 930,002 | May 23, 2025 |
| May 22, 2025 | David H Wang See Remarks | MOption exercise Stock Optionderivative10b5-1 | -60,000 | $0.00 | $0 | 870,002 | May 23, 2025 |
| Mar 15, 2025 | Charles C Pappis director | AGrant or award Stock Optionderivative | +10,000 | $0.00 | $0 | 10,000 | May 21, 2025 |
| May 14, 2025 | Mark McKechnie See Remarks | MOption exercise Class A Common Stock10b5-1 | +15,000 | $5.60 | $84k | 15,900 | May 16, 2025 |
| May 14, 2025 | Mark McKechnie See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $25.22 | $378k | 900 | May 16, 2025 |
| May 14, 2025 | Mark McKechnie See Remarks | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 0 | May 16, 2025 |
| Mar 17, 2025 | Chenming Hu director | SOpen-market sale Class A Common Stock10b5-1 | -163,308 | $30.00 | $4.9M | 100,002 | Mar 19, 2025 |
| Mar 14, 2025 | Haiping Dun director | SOpen-market sale Class A Common Stock10b5-1 | -2,456 | $28.32 | $70k | 762,152 | Mar 18, 2025 |
| Mar 14, 2025 | Haiping Dun director | SOpen-market sale Class A Common Stock10b5-1 | -7,062 | $29.23 | $206k | 755,090 | Mar 18, 2025 |
| Mar 12, 2025 | Mark McKechnie See Remarks | MOption exercise Class A Common Stock10b5-1 | +15,000 | $5.60 | $84k | 15,900 | Mar 14, 2025 |
| Mar 12, 2025 | Mark McKechnie See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $27.42 | $411k | 900 | Mar 14, 2025 |
| Mar 12, 2025 | Mark McKechnie See Remarks | MOption exercise Stock Optionderivative10b5-1 | -15,000 | $0.00 | $0 | 15,000 | Mar 14, 2025 |
| Mar 11, 2025 | David H Wang See Remarks | SOpen-market sale Class A Common Stock10b5-1 | -56,250 | $26.57 | $1.5M | 747,708 | Mar 13, 2025 |
Insiders
Everyone who has filed a Form 4 here.
- Sotheara CheavSee remarks
- Fuping ChenSee remarks
- Haiping Dundirector
- Lisa FengSee remarks
- Chenming Hudirector
- Tracy Liudirector
- Mark McKechnieSee Remarks
- Charles C Pappisdirector
- David H WangSee Remarks
- Jian WangSee remarks
Not investment advice. Scores and forward returns are decision support built from public SEC filings and past prices; they describe what happened after comparable filings, not what will happen after this one. Do your own research and size your risk.