Form 4: ACM Research Director Sells Shares
Insider Transaction (Form 4)
Haiping Dun, a Director of ACM Research, Inc., sold 5,000 shares of common stock on August 18, 2026.
Summary
- Option exercise/conversion: acquired 5,000 Class A Common Stock at $5.60 ($28,000) on August 18, 2026; holds 5,000 after (Direct).
- Open-market sale: disposed of 1,200 Class A Common Stock at $80.29 ($96,348) on August 18, 2026; holds 3,800 after (Direct).
- Open-market sale: disposed of 3,400 Class A Common Stock at $81.31 ($276,454) on August 18, 2026; holds 400 after (Direct).
- Open-market sale: disposed of 400 Class A Common Stock at $82.17 ($32,868) on August 18, 2026 (Direct).
- Option exercise/conversion: disposed of 5,000 Stock Option on August 18, 2026; holds 45,000 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $405,670 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
Haiping Dun — Director
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-08-18 | Option exercise/conversion | Class A Common Stock | 5,000 | $6 | $28.0K | 5,000 |
| 2026-08-18 | Open-market sale | Class A Common Stock | 1,200 | $80 | $96.3K | 3,800 |
| 2026-08-18 | Open-market sale | Class A Common Stock | 3,400 | $81 | $276.5K | 400 |
| 2026-08-18 | Open-market sale | Class A Common Stock | 400 | $82 | $32.9K | 0 |
| 2026-08-18 | Option exercise/conversion | Stock Option | 5,000 | — | — | 45,000 |
Key Dates
| Date | Description |
|---|---|
| 2026-08-18 | Option exercise/conversion (5,000 shares) |
| 2026-08-18 | Open-market sale (1,200 shares) |
| 2026-08-18 | Open-market sale (3,400 shares) |
| 2026-08-18 | Open-market sale (400 shares) |
| 2026-08-18 | Option exercise/conversion (5,000 shares) |
Keywords
insider transaction, Form 4, ACMR, ACM Research, Inc., bearish, Haiping Dun
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