Insider · CIK 0001721581
Haiping Dun
Files at ACMR (ACM Research, Inc.). First filing Nov 26, 2024, latest May 21, 2026.
Haiping Dun files SEC Form 4 as director at ACMR (ACM Research, Inc.). Since Nov 26, 2024, Haiping Dun has reported 0 open-market buys worth $0 and 6 open-market sells worth $1.8M, the latest filed on May 21, 2026.
A track record needs three past buys with six months of prices behind them; Haiping Dun has 0, so none is measured yet.
The newest scored trade: sold $331k of ACMR on May 19, 2026, filed May 21, 2026, scored 15 (weak), under a 10b5-1 plan. In the last 12 months: 0 buys worth $0 and 2 sells worth $548k.
Where the trades landed
Last year at the company this insider has traded most, with each buy and sell on the bar it happened.
ACMR: ACM Research, Inc.
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
This insider’s open-market buys and sells, scored.
| Score | Company | Value | Holdings | Price context | Filed |
|---|---|---|---|---|---|
| 15Weak | ACM Research, Inc. | $331k 5,000 shares | -100% | +197% from low-6% from high | |
| 27Weak | ACM Research, Inc. | $217k 5,000 shares | -100% | +155% from low-34% from high | |
| 24Weak | ACM Research, Inc. | $276k 9,518 shares | -1% | +107% from low0% from high | |
| 26Weak | ACM Research, Inc. | $398k 15,001 shares | -2% | +85% from low-6% from high | |
| 18Weak | ACM Research, Inc. | $332k 19,058 shares | -2% | - | |
| 17Weak | ACM Research, Inc. | $287k 15,000 shares | -2% | - |
Planned sales
Form 144 notices this insider filed before selling restricted or control stock, newest first.
| Filed | Company | Shares | Value | Sale date | Past 3 months |
|---|---|---|---|---|---|
| Mar 14, 2025 | ACMR ACM RESEARCH, INC. | 9,518 0.02% of outstanding | $276k | Mar 14, 2025 | $398k |
| Mar 10, 2025 | ACMR ACM RESEARCH, INC. | 15,001 0.02% of outstanding | $398k | Mar 10, 2025 | none |
| Nov 29, 2024 | ACMR ACM RESEARCH, INC. | 19,058 0.03% of outstanding | $332k | Nov 29, 2024 | $287k |
| Nov 22, 2024 | ACMR ACM RESEARCH, INC. | 15,000 0.02% of outstanding | $287k | Nov 22, 2024 | $345k |
Transactions
Every row this insider has filed, 23 in all, newest first.
| Date | Company | Transaction | Shares | Price | Value | Holdings after | Filed |
|---|---|---|---|---|---|---|---|
| May 19, 2026 | ACMR ACM Research, Inc. | MOption exercise Class A Common Stock10b5-1 | +5,000 | $5.60 | $28k | 5,000 | May 21, 2026 |
| May 19, 2026 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -1,333 | $63.84 | $85k | 3,667 | May 21, 2026 |
| May 19, 2026 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -500 | $65.09 | $33k | 3,167 | May 21, 2026 |
| May 19, 2026 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -1,309 | $67.21 | $88k | 1,858 | May 21, 2026 |
| May 19, 2026 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -1,858 | $67.54 | $125k | 0 | May 21, 2026 |
| May 19, 2026 | ACMR ACM Research, Inc. | MOption exercise Stock Optionderivative10b5-1 | -5,000 | $0.00 | $0 | 50,000 | May 21, 2026 |
| Mar 9, 2026 | ACMR ACM Research, Inc. | MOption exercise Class A Common Stock10b5-1 | +5,000 | $5.60 | $28k | 5,000 | Mar 11, 2026 |
| Mar 9, 2026 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -4,100 | $43.37 | $178k | 900 | Mar 11, 2026 |
| Mar 9, 2026 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -900 | $43.94 | $40k | 0 | Mar 11, 2026 |
| Mar 9, 2026 | ACMR ACM Research, Inc. | MOption exercise Stock Optionderivative10b5-1 | -5,000 | $0.00 | $0 | 55,000 | Mar 11, 2026 |
| Nov 12, 2025 | ACMR ACM Research, Inc. | GGift Class A Common Stock | -755,090 | $0.00 | $0 | 0 | Nov 14, 2025 |
| Aug 12, 2025 | ACMR ACM Research, Inc. | AGrant or award Stock Optionderivative | +20,000 | $0.00 | $0 | 20,000 | Aug 14, 2025 |
| Mar 14, 2025 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -2,456 | $28.32 | $70k | 762,152 | Mar 18, 2025 |
| Mar 14, 2025 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -7,062 | $29.23 | $206k | 755,090 | Mar 18, 2025 |
| Mar 10, 2025 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -15,001 | $26.54 | $398k | 764,608 | Mar 12, 2025 |
| Mar 3, 2025 | ACMR ACM Research, Inc. | MOption exercise Class A Common Stock | +25,001 | $0.50 | $13k | 780,091 | Mar 5, 2025 |
| Mar 3, 2025 | ACMR ACM Research, Inc. | FTax withholding Class A Common Stock | -482 | $25.94 | $13k | 779,609 | Mar 5, 2025 |
| Mar 3, 2025 | ACMR ACM Research, Inc. | MOption exercise Stock Optionderivative | -25,001 | $0.00 | $0 | 0 | Mar 5, 2025 |
| Nov 29, 2024 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -19,058 | $17.43 | $332k | 755,090 | Dec 3, 2024 |
| Nov 22, 2024 | ACMR ACM Research, Inc. | SOpen-market sale Class A Common Stock10b5-1 | -15,000 | $19.12 | $287k | 774,148 | Nov 26, 2024 |
| Nov 14, 2024 | ACMR ACM Research, Inc. | MOption exercise Class A Common Stock | +35,000 | $0.50 | $18k | 790,090 | Nov 18, 2024 |
| Nov 14, 2024 | ACMR ACM Research, Inc. | FTax withholding Class A Common Stock | -942 | $18.59 | $18k | 789,148 | Nov 18, 2024 |
| Nov 14, 2024 | ACMR ACM Research, Inc. | MOption exercise Stock Optionderivative | -35,000 | $0.00 | $0 | 25,001 | Nov 18, 2024 |
Questions about Haiping Dun
Answered from the filings on this page, as of the latest one.
Is Haiping Dun buying or selling?
In the last 12 months Haiping Dun reported 0 open-market buys worth $0 and 2 open-market sells worth $548k on SEC Form 4; the latest was sold $331k of ACMR on May 19, 2026. Grants, option exercises and tax withholding are not counted.
How did Haiping Dun's past buys perform?
Not measured yet. InsiderTell needs three past buys with six months of prices to publish a track record, and Haiping Dun has 0.
Where does Haiping Dun file Form 4?
Haiping Dun has filed Form 4 at ACMR (ACM Research, Inc.). A Form 4 is required of officers, directors and holders of more than 10% of a share class within two business days of a trade.
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.