Charles C. Pappis - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 3, 2026
Charles C. Pappis is a corporate insider tracked by InsiderAlpha. No SEC Form 4 filings recorded in the last 90 days. Lifetime open-market sales: $510K.
Profile
Charles C. Pappis is a corporate insider at ACM Research, Inc. (ACMR). Pappis has reported 3 insider filings with the SEC since 2025. The most recent filing was in April 2026.
| Role | Insider |
|---|---|
| Notability | 20/100 |
Board memberships
- ACM Research, Inc.
Trading Pattern
InsiderAlpha's records for Charles C. Pappis go back to 2025: 3 primary Form 4 filings, an average of 1.5 per year. 6 recorded transactions carry a Rule 10b5-1 flag, meaning they were pre-scheduled under a written trading plan rather than discretionary.
Career & Filing History
Every role Charles C. Pappis has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Insider at ACM Research, Inc. (ACMR) - 3 filings, 2025 to 2026
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-04-21 | ACMR | ACM Research, Inc. | S - Open-market sale [10b5-1] | 5.0K | $52.00 | $260K |
| 2026-04-21 | ACMR | ACM Research, Inc. | M - Option exercise [10b5-1] | 5.0K | $29.18 | $146K |
| 2026-03-09 | ACMR | ACM Research, Inc. | S - Open-market sale [10b5-1] | 5.0K | $50.09 | $250K |
| 2026-03-09 | ACMR | ACM Research, Inc. | M - Option exercise [10b5-1] | 5.0K | $29.18 | $146K |
Most Active Insiders Right Now
Charles C. Pappis has no recent co-filers at the same companies, so here are the insiders with the largest open-market activity across the market in the last 90 days.
- MetLife Investment Management, LLC - $1600000.00B of FINS open-market activity in the last 90 days
- Magnetar Financial LLC - $16357.48B of CRWV open-market activity in the last 90 days
- Marianne Okland - $18.46B of STNG open-market activity in the last 90 days
- VisionWave Holdings, Inc. - $14.13B of SVRE open-market activity in the last 90 days
- Vanessa Allen Sutherland - $7.44B of PSX open-market activity in the last 90 days
- AI Alpine (Luxembourg) S.a.r.l. - $2.69B of INIO open-market activity in the last 90 days
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Dirkson R. Charles
- Jorey Chernett
- John W. Childs
- Mahesh Choudhury
- Jonathan H. Cohen
- Ryan Cohen
- Charles K. Cohn
- Coliseum Capital Management, LLC
Frequently Asked Questions
Who is Charles C. Pappis?
Charles C. Pappis is a corporate insider at ACM Research, Inc. (ACMR). Pappis has reported 3 insider filings with the SEC since 2025. The most recent filing was in April 2026.…
Has Charles C. Pappis been buying or selling stock?
Recorded transactions: 0 open-market purchases and 2 open-market sales ($510K) across all tracked filings.
Where can I see all of Charles C. Pappis's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live Charles C. Pappis profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.