Haiping Dun is Director at ACM Research, Inc. (ACMR). They have made 8 open-market trades across 1 company since 2022, most recently 2026-08-18.
CIK 0001721581
Unrated. We grade insiders only on stock they chose to buy on the open market. Grants, option exercises and vesting say nothing about timing, so they don't count — which is why someone can file often and still have no grade. It isn't a bad sign: unrated buys beat every graded tier below A.
0 open-market purchases, against 8 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ACMR | 400 | $18K |
Shares reported on the most recent Form 4, priced at the 2026-08-20 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| ACMR | SELL · 10b5-1 | 2026-08-18 | 2026-08-20 | $81.13 | $406K | -12.6% | -9.0% | — |
| ACMR | SELL · 10b5-1 | 2026-05-19 | 2026-05-21 | $66.22 | $331K | +25.2% | +45.7% | +9.8% |
| ACMR | SELL | 2026-03-09 | 2026-03-11 | $43.47 | $217K | -3.9% | +3.1% | +74.8% |
| ACMR | SELL · 10b5-1 | 2025-03-14 | 2025-03-18 | $29.00 | $552K | -17.4% | -35.0% | -14.6% |
| ACMR | SELL · 10b5-1 | 2025-03-10 | 2025-03-12 | $26.54 | $796K | +2.4% | -29.0% | -6.3% |
| ACMR | SELL · 10b5-1 | 2024-11-29 | 2024-12-03 | $17.43 | $664K | -4.6% | -4.8% | +48.7% |
| ACMR | SELL · 10b5-1 | 2024-11-22 | 2024-11-26 | $19.12 | $287K | -9.0% | -11.0% | +33.5% |
| ACMR | SELL · 10b5-1 | 2024-08-29 | 2024-09-03 | $18.08 | $691K | +1.6% | +14.3% | -5.3% |
| ACMR | SELL · 10b5-1 | 2024-08-22 | 2024-08-26 | $19.85 | $298K | -15.4% | -4.1% | -0.3% |
| ACMR | SELL · 10b5-1 | 2024-05-29 | 2024-05-31 | $22.63 | $871K | +11.6% | +5.4% | -19.2% |
| ACMR | SELL · 10b5-1 | 2024-05-22 | 2024-05-24 | $22.88 | $343K | -0.5% | -1.0% | -15.9% |
| ACMR | SELL · 10b5-1 | 2024-03-14 | 2024-03-15 | $27.70 | $1.1M | +4.2% | +2.4% | -7.6% |
| ACMR | SELL · 10b5-1 | 2024-03-08 | 2024-03-12 | $30.36 | $455K | +6.2% | +3.5% | -19.9% |
| ACMR | SELL · 10b5-1 | 2023-11-29 | 2023-12-01 | $17.25 | $327K | +6.2% | +12.2% | +85.8% |
| ACMR | SELL · 10b5-1 | 2023-11-22 | 2023-11-27 | $17.66 | $265K | -8.3% | +12.6% | +22.9% |
| ACMR | SELL | 2023-08-22 | 2023-08-24 | $13.85 | $889K | +25.9% | +8.3% | +14.7% |
| ACMR | SELL | 2023-06-01 | 2023-06-05 | $10.00 | $375K | +18.7% | +44.2% | +104.1% |
| ACMR | SELL | 2023-03-16 | 2023-03-20 | $12.06 | $452K | -2.1% | -12.6% | -2.1% |
| ACMR | SELL | 2022-11-30 | 2022-12-02 | $8.43 | $596K | +6.1% | +6.3% | +13.4% |
| ACMR | SELL | 2022-08-22 | 2022-08-24 | $16.10 | $1.2M | -9.1% | -18.7% | -48.5% |
| ACMR | SELL · Routine | 2022-08-15 | 2022-08-17 | $19.28 | $704K | -2.1% | -13.1% | -44.6% |
| ACMR | SELL | 2022-05-27 | 2022-05-31 | $15.00 | $542K | -1.3% | +11.8% | +14.0% |
| ACMR | SELL | 2022-03-09 | 2022-03-11 | $82.09 | $1.7M | +23.1% | -2.8% | -15.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.