Company · CIK 0001680062 · SIC 3559 — Special Industry Machinery, NEC · Nasdaq
ACM Research, Inc. · ACMR
Insider activity reported against this company. All insider holders · On EDGAR ↗
Reported at this company — common stock
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 8, 2026 SForm 4 → | Sep 10, 4:30 pm EDT | David H WangSee Remarks, Director, 10% Owner | 140,000 | $75.93 | $10,630,010 | 802,708 | −14.9% | 10b5-1 |
| Sep 8, 2026 MForm 4 → | Sep 10, 4:30 pm EDT | David H WangSee Remarks, Director, 10% Owner | 140,000 | $1.00 | $140,000 | 872,708 | — | 10b5-1 |
| Aug 20, 2026 SForm 4 → | Aug 21, 9:30 pm EDT | Mark McKechnieSee Remarks | 55,199 | $77.27 | $4,264,971 | 900 | −98.4% | 10b5-1 |
| Aug 20, 2026 MForm 4 → | Aug 21, 9:30 pm EDT | Mark McKechnieSee Remarks | 55,199 | $16.95 | $935,829 | 56,099 | — | 10b5-1 |
| Aug 18, 2026 SForm 4 → | Aug 20, 4:30 pm EDT | Haiping DunDirector | 5,000 | $81.13 | $405,670 | 0 | −100% | 10b5-1 |
| Aug 18, 2026 MForm 4 → | Aug 20, 4:30 pm EDT | Haiping DunDirector | 5,000 | $5.60 | $28,000 | 5,000 | — | 10b5-1 |
| Jun 4, 2026 SForm 4 → | Jun 5, 9:00 pm EDT | Sotheara CheavSee remarks | 18,750 | $84.58 | $1,585,923 | 100,002 | −15.8% | 10b5-1 |
| Jun 4, 2026 MForm 4 → | Jun 5, 9:00 pm EDT | Sotheara CheavSee remarks | 18,750 | $13.89 | $260,438 | 105,401 | — | 10b5-1 |
| Jun 3, 2026 SForm 4 → | Jun 5, 4:30 pm EDT | David H WangSee Remarks, Director, 10% Owner | 100,002 | $88.35 | $8,835,388 | 802,708 | −11.1% | 10b5-1 |
| Jun 3, 2026 MForm 4 → | Jun 5, 4:30 pm EDT | David H WangSee Remarks, Director, 10% Owner | 100,002 | $1.00 | $100,002 | 842,710 | — | 10b5-1 |
Reported at this company — derivatives (options, RSUs, warrants)
| Trade | Reported (ET) | Insider | Shares | Avg price | Total | Owned after | Δ stake | Flags |
|---|---|---|---|---|---|---|---|---|
| Sep 8, 2026 MForm 4 → | Sep 10, 4:30 pm EDT | David H WangSee Remarks, Director, 10% Owner | 140,000 | — | — | 130,000 | — | 10b5-1 |
| Aug 20, 2026 MForm 4 → | Aug 21, 9:30 pm EDT | Mark McKechnieSee Remarks | 55,199 | — | — | 215,000 | — | 10b5-1 |
| Aug 18, 2026 MForm 4 → | Aug 20, 4:30 pm EDT | Haiping DunDirector | 5,000 | — | — | 45,000 | — | 10b5-1 |
| Aug 12, 2026 AForm 4 → | Aug 26, 9:30 pm EDT | Charles C PappisDirector | 7,128 | — | — | 728 | — | late |
| Aug 12, 2026 AForm 4 → | Aug 26, 9:30 pm EDT | Tracy LiuDirector | 7,128 | — | — | 728 | — | late |
| Aug 12, 2026 AForm 4 → | Aug 26, 9:30 pm EDT | Haiping DunDirector | 7,128 | — | — | 728 | — | late |
| Jun 4, 2026 MForm 4 → | Jun 5, 9:00 pm EDT | Sotheara CheavSee remarks | 18,750 | — | — | 37,500 | — | 10b5-1 |
| Jun 3, 2026 MForm 4 → | Jun 5, 4:30 pm EDT | David H WangSee Remarks, Director, 10% Owner | 100,002 | — | — | 270,000 | — | 10b5-1 |
| May 13, 2026 AForm 4 → | Jul 6, 9:00 pm EDT | David H WangSee Remarks, Director, 10% Owner | 6,208 | — | — | 6,208 | — | late |