David H. Wang is 10% Owner at ACM Research, Inc. (ACMR). They have made 4 open-market trades across 1 company since 2020, most recently 2026-09-09.
CIK 0001721580
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 4 sales. Too few scored purchases to measure a record yet.
| Ticker | Shares | Value |
|---|---|---|
| ACMR | 802,708 | $35.6M |
Shares reported on the most recent Form 4, priced at the 2026-09-10 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 | 2026-09-08 | 2026-09-10 | $75.93 | $10.6M | +3.3% | -7.2% | — |
| ACMR | SELL · 10b5-1 | 2026-06-03 | 2026-06-05 | $88.35 | $8.8M | +16.9% | +19.6% | -15.7% |
| ACMR | SELL | 2026-03-11 | 2026-03-13 | $46.86 | $5.2M | -5.6% | +2.6% | +89.9% |
| ACMR | SELL · 10b5-1 | 2025-12-03 | 2025-12-05 | $33.73 | $6.4M | +5.4% | +26.9% | +36.3% |
| ACMR | SELL · 10b5-1 | 2025-09-03 | 2025-09-05 | $26.67 | $5.3M | +21.4% | +50.2% | +24.5% |
| ACMR | SELL · 10b5-1 | 2025-05-21 | 2025-05-23 | $23.31 | $4.7M | +1.9% | +6.5% | +10.5% |
| ACMR | SELL · 10b5-1 | 2025-03-11 | 2025-03-13 | $27.02 | $7.1M | +1.7% | -28.2% | -7.9% |
| ACMR | SELL · 10b5-1 | 2024-11-29 | 2024-12-03 | $17.44 | $2.0M | -4.6% | -4.8% | +48.7% |
| ACMR | SELL · 10b5-1 | 2024-11-26 | 2024-11-29 | $17.89 | $2.0M | -6.9% | -10.0% | +55.8% |
| ACMR | SELL · 10b5-1 | 2024-11-22 | 2024-11-26 | $19.08 | $1.1M | -9.0% | -11.0% | +33.5% |
| ACMR | SELL · 10b5-1 | 2024-05-29 | 2024-05-31 | $22.62 | $2.9M | +11.6% | +5.4% | -19.2% |
| ACMR | SELL · 10b5-1 | 2024-05-22 | 2024-05-24 | $22.81 | $1.0M | -0.5% | -1.0% | -15.9% |
| ACMR | SELL · 10b5-1 | 2024-03-14 | 2024-03-15 | $27.62 | $4.8M | +4.2% | +2.4% | -7.6% |
| ACMR | SELL · 10b5-1 | 2024-03-08 | 2024-03-12 | $30.36 | $2.7M | +6.2% | +3.5% | -19.9% |
| ACMR | SELL · 10b5-1 | 2023-11-29 | 2023-12-01 | $17.13 | $2.1M | +6.2% | +12.2% | +85.8% |
| ACMR | SELL · 10b5-1 | 2023-11-22 | 2023-11-27 | $17.67 | $2.4M | -8.3% | +12.6% | +22.9% |
| ACMR | SELL · 10b5-1 | 2023-09-12 | 2023-09-14 | $17.87 | $6.3M | +0.9% | +12.3% | +6.5% |
| ACMR | SELL | 2021-03-18 | 2021-03-22 | $91.01 | $13.5M | -2.9% | -14.6% | +4.6% |
| ACMR | SELL | 2020-12-03 | 2020-12-07 | $79.58 | $14.4M | -10.8% | +20.2% | -2.6% |
| ACMR | SELL | 2020-09-03 | 2020-09-04 | $80.83 | $9.6M | +0.5% | +8.5% | +15.9% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.