Pappis Charles C (CIK 1475345) reported 4 SEC Form 4 insider transactions across 1 companies over the past 18 months (most recent 2026-04-21). Recent activity: Buy ACMR (5,000 shares), Sell ACMR (5,000 shares), Buy ACMR (5,000 shares), Sell ACMR (5,000 shares). Source: SEC Form 4.
| Date | Company | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-04-21 | ACM Research, Inc. (ACMR) | Director | Buy | 5,000 | $145,900 |
| 2026-04-21 | ACM Research, Inc. (ACMR) | Director | Sell | 5,000 | $260,000 |
| 2026-03-09 | ACM Research, Inc. (ACMR) | Director | Buy | 5,000 | $145,900 |
| 2026-03-09 | ACM Research, Inc. (ACMR) | Director | Sell | 5,000 | $250,450 |
Source: SEC Form 4 filings · as of 2026-04-21