10 insiders reported 136 Form 4 transactions for ACM Research, Inc. (ACMR) over the past 18 months (most recent 2026-08-21). Recent activity: McKechnie Mark (See Remarks) Buy 30,199 shares, McKechnie Mark (See Remarks) Buy 25,000 shares, McKechnie Mark (See Remarks) Sell 13,625 shares, McKechnie Mark (See Remarks) Sell 30,365 shares, McKechnie Mark (See Remarks) Sell 11,209 shares. Source: SEC Form 4.
| Date | Insider | Title | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-08-21 | McKechnie Mark | See Remarks | Buy | 30,199 | $588,579 |
| 2026-08-21 | McKechnie Mark | See Remarks | Buy | 25,000 | $347,250 |
| 2026-08-21 | McKechnie Mark | See Remarks | Sell | 13,625 | $1.0M |
| 2026-08-21 | McKechnie Mark | See Remarks | Sell | 30,365 | $2.4M |
| 2026-08-21 | McKechnie Mark | See Remarks | Sell | 11,209 | $873,069 |
| 2026-08-20 | Dun Haiping | Director | Buy | 5,000 | $28,000 |
| 2026-08-20 | Dun Haiping | Director | Sell | 1,200 | $96,348 |
| 2026-08-20 | Dun Haiping | Director | Sell | 3,400 | $276,454 |
| 2026-08-20 | Dun Haiping | Director | Sell | 400 | $32,868 |
| 2026-06-05 | Wang David H | See Remarks | Sell | 4,300 | $376,551 |
| 2026-06-05 | Cheav Sotheara | See remarks | Buy | 13,351 | $185,445 |
| 2026-06-05 | Cheav Sotheara | See remarks | Sell | 1,300 | $109,304 |
| 2026-06-05 | Wang David H | See Remarks | Buy | 60,000 | $60,000 |
| 2026-06-05 | Cheav Sotheara | See remarks | Sell | 9,212 | $784,033 |
| 2026-06-05 | Wang David H | See Remarks | Sell | 6,295 | $560,129 |
| 2026-06-05 | Cheav Sotheara | See remarks | Sell | 2,839 | $243,501 |
| 2026-06-05 | Wang David H | See Remarks | Sell | 32,450 | $2.9M |
| 2026-06-05 | Cheav Sotheara | See remarks | Buy | 5,399 | $74,992 |
| 2026-06-05 | Wang David H | See Remarks | Sell | 9,925 | $900,992 |
| 2026-06-05 | Cheav Sotheara | See remarks | Sell | 2,384 | $194,844 |
| 2026-06-05 | Wang David H | See Remarks | Sell | 5,843 | $539,776 |
| 2026-06-05 | Cheav Sotheara | See remarks | Sell | 968 | $79,966 |
| 2026-06-05 | Wang David H | See Remarks | Sell | 1,187 | $110,438 |
| 2026-06-05 | Cheav Sotheara | See remarks | Sell | 400 | $33,604 |
| 2026-06-05 | Wang David H | See Remarks | Buy | 40,002 | $40,002 |
Source: SEC Form 4 filings · as of 2026-08-21