ACM ResearchACMR
Semiconductors & chip supply chain
Insider transactions
Directors, officers and 10% owners, as reported on Forms 3, 4 and 5. Grants, option exercises and shares withheld for tax are shown but not counted as buying or selling.
- Open-market buys
- 0
- Open-market sales
- 72
- Shares bought
- 0
- Shares sold
- 948,752
Past 12 months · $0.00 bought, $51.2M sold
| Filed | Insider | Transaction | Shares | Price | Value | Held after |
|---|---|---|---|---|---|---|
| David H. WangOfficer · Director · 10% owner | HoldingForm 4 · indirect | 0 | — | — | 100,002 | |
| David H. WangOfficer · Director · 10% owner | HoldingForm 4 · indirect | 0 | — | — | 620,001 | |
| David H. WangOfficer · Director · 10% owner | HoldingForm 4 · indirect | 0 | — | — | 180,000 | |
| traded Sep 9, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 33,493 | $73.80 | $2.5M | 839,215 |
| traded Sep 9, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 18,934 | $74.67 | $1.4M | 820,281 |
| traded Sep 9, 2026 | David H. WangOfficer · Director · 10% owner | Option exerciseForm 4 | 70,000 | $1.00 | $70,000 | 872,708 |
| traded Sep 9, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 11,666 | $75.58 | $881,716 | 808,615 |
| traded Sep 9, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 1,100 | $77.59 | $85,349 | 802,708 |
| traded Sep 9, 2026 | David H. WangOfficer · Director · 10% owner | Option exerciseForm 4 | 70,000 | $1.00 | $70,000 | 130,000 |
| traded Sep 9, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 4,807 | $76.73 | $368,841 | 803,808 |
| traded Sep 8, 2026 | David H. WangOfficer · Director · 10% owner | Option exerciseForm 4 | 70,000 | $1.00 | $70,000 | 872,708 |
| traded Sep 8, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 51,374 | $77.15 | $4.0M | 816,531 |
| traded Sep 8, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 1,500 | $78.57 | $117,855 | 802,708 |
| traded Sep 8, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 12,323 | $78.08 | $962,180 | 804,208 |
| traded Sep 8, 2026 | David H. WangOfficer · Director · 10% owner | Open-market saleForm 4 | 4,803 | $75.99 | $364,980 | 867,905 |
| traded Sep 8, 2026 | David H. WangOfficer · Director · 10% owner | Option exerciseForm 4 | 70,000 | $1.00 | $70,000 | 200,000 |
| traded Aug 12, 2026 | Tracy LiuDirector | Grant or awardForm 4 | 6,400 | $81.26 | $520,064 | 6,400 |
| traded Aug 12, 2026 | Charles C. PappisDirector | Grant or awardForm 4 | 728 | $96.13 | $69,983 | 728 |
| traded Aug 12, 2026 | Charles C. PappisDirector | Grant or awardForm 4 | 6,400 | $81.26 | $520,064 | 6,400 |
| traded Aug 12, 2026 | Tracy LiuDirector | Grant or awardForm 4 | 728 | $96.13 | $69,983 | 728 |
| traded Aug 12, 2026 | Haiping DunDirector | Grant or awardForm 4 | 728 | $96.13 | $69,983 | 728 |
| traded Aug 12, 2026 | Haiping DunDirector | Grant or awardForm 4 | 6,400 | $81.26 | $520,064 | 6,400 |
| traded Aug 20, 2026 | Mark McKechnieCFO · Treas | Option exerciseForm 4 | 30,199 | $19.49 | $588,579 | 31,099 |
| traded Aug 20, 2026 | Mark McKechnieCFO · Treas | Open-market saleForm 4 | 13,625 | $76.34 | $1.0M | 42,474 |
| traded Aug 20, 2026 | Mark McKechnieCFO · Treas | Option exerciseForm 4 | 25,000 | $13.89 | $347,250 | 56,099 |
| traded Aug 20, 2026 | Mark McKechnieCFO · Treas | Open-market saleForm 4 | 30,365 | $77.45 | $2.4M | 12,109 |
| traded Aug 20, 2026 | Mark McKechnieCFO · Treas | Open-market saleForm 4 | 11,209 | $77.89 | $873,069 | 900 |
| traded Aug 20, 2026 | Mark McKechnieCFO · Treas | Option exerciseForm 4 | 30,199 | $19.49 | $588,579 | 31,250 |
| traded Aug 20, 2026 | Mark McKechnieCFO · Treas | Option exerciseForm 4 | 25,000 | $13.89 | $347,250 | 215,000 |
| Haiping DunDirector | HoldingForm 4 · indirect | 0 | — | — | 100,000 | |
| Haiping DunDirector | HoldingForm 4 · indirect | 0 | — | — | 755,090 | |
| traded Aug 18, 2026 | Haiping DunDirector | Open-market saleForm 4 | 1,200 | $80.29 | $96,348 | 3,800 |
| traded Aug 18, 2026 | Haiping DunDirector | Open-market saleForm 4 | 400 | $82.17 | $32,868 | 0 |
| traded Aug 18, 2026 | Haiping DunDirector | Option exerciseForm 4 | 5,000 | $5.60 | $28,000 | 5,000 |
| traded Aug 18, 2026 | Haiping DunDirector | Open-market saleForm 4 | 3,400 | $81.31 | $276,454 | 400 |
| traded Aug 18, 2026 | Haiping DunDirector | Option exerciseForm 4 | 5,000 | $5.60 | $28,000 | 45,000 |
| David H. WangCEO · Pres · Dir · Director · 10% owner | HoldingForm 4 · indirect | 0 | — | — | 100,002 | |
| David H. WangCEO · Pres · Dir · Director · 10% owner | HoldingForm 4 · indirect | 0 | — | — | 45,837 | |
| David H. WangCEO · Pres · Dir · Director · 10% owner | HoldingForm 4 · indirect | 0 | — | — | 620,001 | |
| David H. WangCEO · Pres · Dir · Director · 10% owner | HoldingForm 4 · indirect | 0 | — | — | 180,000 |