Form 4: ACM Research Executive Sells Shares
Insider Transaction (Form 4)
David H Wang, See Remarks, a Director and 10% owner of ACM Research, Inc., sold 140,000 shares of common stock on September 8, 2026.
Summary
- Option exercise/conversion: acquired 70,000 Class A Common Stock at $1.00 ($70,000) on September 8, 2026; holds 872,708 after (Direct).
- Open-market sale: disposed of 4,803 Class A Common Stock at $75.99 ($364,980) on September 8, 2026; holds 867,905 after (Direct).
- Open-market sale: disposed of 51,374 Class A Common Stock at $77.15 ($3,963,504) on September 8, 2026; holds 816,531 after (Direct).
- Open-market sale: disposed of 12,323 Class A Common Stock at $78.08 ($962,180) on September 8, 2026; holds 804,208 after (Direct).
- Open-market sale: disposed of 1,500 Class A Common Stock at $78.57 ($117,855) on September 8, 2026; holds 802,708 after (Direct).
- Option exercise/conversion: acquired 70,000 Class A Common Stock at $1.00 ($70,000) on September 9, 2026; holds 872,708 after (Direct).
- Open-market sale: disposed of 33,493 Class A Common Stock at $73.80 ($2,471,783) on September 9, 2026; holds 839,215 after (Direct).
- Open-market sale: disposed of 18,934 Class A Common Stock at $74.67 ($1,413,802) on September 9, 2026; holds 820,281 after (Direct).
- Open-market sale: disposed of 11,666 Class A Common Stock at $75.58 ($881,716) on September 9, 2026; holds 808,615 after (Direct).
- Open-market sale: disposed of 4,807 Class A Common Stock at $76.73 ($368,841) on September 9, 2026; holds 803,808 after (Direct).
- Open-market sale: disposed of 1,100 Class A Common Stock at $77.59 ($85,349) on September 9, 2026; holds 802,708 after (Direct).
- Option exercise/conversion: disposed of 70,000 Stock Option on September 8, 2026; holds 200,000 after (Direct).
- Option exercise/conversion: disposed of 70,000 Stock Option on September 9, 2026; holds 130,000 after (Direct).
Sentiment
Score: 4
Explanation: StockSavvy.ai views this as a mildly negative but low-conviction signal: an insider sold $10,630,010 of stock under a pre-arranged Rule 10b5-1 plan, which is typically routine.
Insider Transactions
David H Wang — Director, Officer (See Remarks), 10% owner
Transaction made under a Rule 10b5-1 trading plan.
| Date | Transaction | Security | Shares | Price | Value | Held After |
|---|---|---|---|---|---|---|
| 2026-09-08 | Option exercise/conversion | Class A Common Stock | 70,000 | $1 | $70.0K | 872,708 |
| 2026-09-08 | Open-market sale | Class A Common Stock | 4,803 | $76 | $365.0K | 867,905 |
| 2026-09-08 | Open-market sale | Class A Common Stock | 51,374 | $77 | $4.0M | 816,531 |
| 2026-09-08 | Open-market sale | Class A Common Stock | 12,323 | $78 | $962.2K | 804,208 |
| 2026-09-08 | Open-market sale | Class A Common Stock | 1,500 | $79 | $117.9K | 802,708 |
| 2026-09-09 | Option exercise/conversion | Class A Common Stock | 70,000 | $1 | $70.0K | 872,708 |
| 2026-09-09 | Open-market sale | Class A Common Stock | 33,493 | $74 | $2.5M | 839,215 |
| 2026-09-09 | Open-market sale | Class A Common Stock | 18,934 | $75 | $1.4M | 820,281 |
| 2026-09-09 | Open-market sale | Class A Common Stock | 11,666 | $76 | $881.7K | 808,615 |
| 2026-09-09 | Open-market sale | Class A Common Stock | 4,807 | $77 | $368.8K | 803,808 |
| 2026-09-09 | Open-market sale | Class A Common Stock | 1,100 | $78 | $85.3K | 802,708 |
| 2026-09-08 | Option exercise/conversion | Stock Option | 70,000 | — | — | 200,000 |
| 2026-09-09 | Option exercise/conversion | Stock Option | 70,000 | — | — | 130,000 |
Key Dates
| Date | Description |
|---|---|
| 2026-09-08 | Option exercise/conversion (70,000 shares) |
| 2026-09-08 | Open-market sale (4,803 shares) |
| 2026-09-08 | Open-market sale (51,374 shares) |
| 2026-09-08 | Open-market sale (12,323 shares) |
| 2026-09-08 | Open-market sale (1,500 shares) |
| 2026-09-09 | Option exercise/conversion (70,000 shares) |
| 2026-09-09 | Open-market sale (33,493 shares) |
| 2026-09-09 | Open-market sale (18,934 shares) |
| 2026-09-09 | Open-market sale (11,666 shares) |
| 2026-09-09 | Open-market sale (4,807 shares) |
| 2026-09-09 | Open-market sale (1,100 shares) |
| 2026-09-08 | Option exercise/conversion (70,000 shares) |
| 2026-09-09 | Option exercise/conversion (70,000 shares) |
Keywords
insider transaction, Form 4, ACMR, ACM Research, Inc., bearish, David H Wang
Disclaimer:The information provided here is for general informational purposes only and does not constitute financial advice, recommendation, or endorsement of any kind. It may contain errors or omissions. You should not rely on this information to make financial decisions. Always seek the advice of a qualified financial professional before making any investment or financial decisions. Use of this information is at your own risk.