ACM Research, Inc. (ACMR) insider buying and SEC filings
ACM Research, Inc. · CIK 1680062
Tracked: Forms 3/4/5, 8-K, NT · All filings on sec.gov
Company profile
- Exchanges
- Nasdaq
- Industry (SIC)
- Special Industry Machinery, NEC
- State of incorporation
- CA
- Fiscal year end
- Dec 31
Insider activity in the last 12 months
Bought
$0
Insiders who bought
0
Sold (not marked 10b5-1)
$0
Planned sales (10b5-1)
$51.2M
Insider purchases and sales, last 12 months
| Traded | Type | What was filed | Source |
|---|---|---|---|
| Sep 8–9, 2026 | Planned (10b5-1) | David H Wang (Director and Officer) sold 140,000 shares between Sep 8 and Sep 9 at about $75.93 ($10.6M), marked as a 10b5-1 plan trade. Holdings down 15% to 802,708 shares. | SEC filing Filed Sep 10, 2026 |
| Aug 20, 2026 | Planned (10b5-1) | Mark McKechnie (CFO) sold 55,199 shares at about $77.27 ($4.3M), marked as a 10b5-1 plan trade. Holdings down 98% to 900 shares. | SEC filing Filed Aug 21, 2026 |
| Aug 18, 2026 | Planned (10b5-1) | Haiping Dun (Director) sold 5,000 shares at about $81.13 ($406K), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed Aug 20, 2026 |
| Jun 4–5, 2026 | Planned (10b5-1) | Sotheara Cheav (Officer) sold 18,750 shares between Jun 4 and Jun 5 at about $84.58 ($1.6M), marked as a 10b5-1 plan trade. Holdings down 16% to 100,002 shares. | SEC filing Filed Jun 5, 2026 |
| Jun 3–4, 2026 | Planned (10b5-1) | David H Wang (CEO and Director) sold 100,002 shares between Jun 3 and Jun 4 at about $88.35 ($8.8M), marked as a 10b5-1 plan trade. Holdings down 11% to 802,708 shares. | SEC filing Filed Jun 5, 2026 |
| May 19, 2026 | Planned (10b5-1) | Haiping Dun (Director) sold 5,000 shares at about $66.22 ($331K), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed May 21, 2026 |
| Apr 17, 2026 | Planned (10b5-1) | Charles C Pappis (Director) sold 5,000 shares at $52.00 ($260K), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed Apr 21, 2026 |
| Mar 12, 2026 | Planned (10b5-1) | Mark McKechnie (CFO) sold 98,551 shares at about $45.58 ($4.5M), marked as a 10b5-1 plan trade. Holdings down 99% to 900 shares. | SEC filing Filed Mar 13, 2026 |
| Mar 11–12, 2026 | Planned (10b5-1) | David H Wang (CEO and Director) sold 110,000 shares between Mar 11 and Mar 12 at about $46.86 ($5.2M), marked as a 10b5-1 plan trade. Holdings down 12% to 802,708 shares. | SEC filing Filed Mar 13, 2026 |
| Mar 10–11, 2026 | Planned (10b5-1) | Tracy Liu (Director) sold 60,000 shares between Mar 10 and Mar 11 at about $47.51 ($2.9M), marked as a 10b5-1 plan trade. Holdings down 35% to 110,772 shares. | SEC filing Filed Mar 12, 2026 |
| Mar 9, 2026 | Planned (10b5-1) | Haiping Dun (Director) sold 5,000 shares at about $43.47 ($217K), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed Mar 11, 2026 |
| Mar 5, 2026 | Planned (10b5-1) | Charles C Pappis (Director) sold 5,000 shares at $50.09 ($250K), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed Mar 9, 2026 |
| Mar 5–6, 2026 | Planned (10b5-1) | Lisa Feng (CFO) sold 30,000 shares between Mar 5 and Mar 6 at about $48.04 ($1.4M), marked as a 10b5-1 plan trade. Holdings down 37% to 50,001 shares. | SEC filing Filed Mar 9, 2026 |
| Dec 4–8, 2025 | Planned (10b5-1) | Mark McKechnie (CFO) sold 31,250 shares between Dec 4, 2025 and Dec 8, 2025 at about $34.93 ($1.1M), marked as a 10b5-1 plan trade. Holdings down 97% to 900 shares. | SEC filing Filed Dec 8, 2025 |
| Dec 3–4, 2025 | Planned (10b5-1) | David H Wang (CEO and Director) sold 130,000 shares between Dec 3, 2025 and Dec 4, 2025 at about $33.55 ($4.4M), marked as a 10b5-1 plan trade. Holdings down 14% to 802,708 shares. | SEC filing Filed Dec 5, 2025 |
| Dec 2–3, 2025 | Planned (10b5-1) | Fuping Chen (Officer) sold 120,000 shares between Dec 2, 2025 and Dec 3, 2025 at about $33.18 ($4.0M), marked as a 10b5-1 plan trade. Holdings down 100% to 0 shares. | SEC filing Filed Dec 4, 2025 |
| Nov 12–13, 2025 | Planned (10b5-1) | Lisa Feng (CFO) sold 30,000 shares between Nov 12, 2025 and Nov 13, 2025 at about $33.27 ($998K), marked as a 10b5-1 plan trade. Holdings down 37% to 50,001 shares. | SEC filing Filed Nov 14, 2025 |
23 routine transactions (such as grants, option exercises or tax withholding) are not listed.
Cluster buys
No cluster buys in the last 12 months.
Red flags
No red flags in the last 12 months.
Key events
No key events in the last 12 months.
8-K filings, last 12 months
| Filed | Items | Tag | Source |
|---|---|---|---|
| Nov 3, 2026, 4:35 PM ET 8-K | Executive or director change (Item 5.02) | SEC filing | |
| Oct 28, 2026, 8:13 AM ET 8-K | Earnings released (Item 2.02) | SEC filing |
Red flags are objective triggers only: the item or form filed, never an opinion.
Follow ACMR in the Insider Ledger app
Get the appA plain-English brief of insider purchases, 8-Ks and red flags at the companies you pick. No account needed.