Charles C. Pappis

CIK: 0001475345

Transaction Breakdown

Open Market Buys (P)0 (0.0%)

High conviction signal

Open Market Sales (S)2 (25.0%)

Position reduction

Option Exercises (M)2 (25.0%)

Derivative conversions

Awards (A)4 (50.0%)

Compensation grants

Other (G, F, J, C, D, …)0 (0.0%)

Gifts, tax withholding, conversions, dispositions to the issuer and other codes

Companies & Roles (1)

ACMR

ACM Research, Inc.

Director

Discretionary Trading P&L

Holdings

Transaction History (8 total)

ACMR
ACM Research, Inc.
Aug 12, 2026
Award(A)
Restricted Stock Units
Direct
728 shares-
ACMR
ACM Research, Inc.
Aug 12, 2026
Award(A)
Stock Option
Direct
6.4K shares-
ACMR
ACM Research, Inc.
Apr 17, 2026
Exercise(M)
Direct
5K shares at avg. $29.18$146K
ACMR
ACM Research, Inc.
Apr 17, 2026
Sale(S)
Direct
5K shares at avg. $52.00$260K
ACMR
ACM Research, Inc.
Mar 5, 2026
Exercise(M)
Direct
5K shares at avg. $29.18$146K
ACMR
ACM Research, Inc.
Mar 5, 2026
Sale(S)
Direct
5K shares at avg. $50.09$250K
ACMR
ACM Research, Inc.
Aug 12, 2025
Award(A)
Stock Option
Direct
20K shares-
ACMR
ACM Research, Inc.
Mar 15, 2025
Award(A)
Stock Option
Direct
10K shares-

		Type	Shares	Price		Ownership
Aug 12, 2026	ACMR ACM Research, Inc.	Award(A) Restricted Stock Units	728	-	-	Direct
Aug 12, 2026	ACMR ACM Research, Inc.	Award(A) Stock Option	6,400	-	-	Direct
Apr 17, 2026	ACMR ACM Research, Inc.	Exercise(M)	5,000	$29.18	$145,900	Direct
Apr 17, 2026	ACMR ACM Research, Inc.	Sale(S)	5,000	$52.00	$260,000	Direct
Mar 5, 2026	ACMR ACM Research, Inc.	Exercise(M)	5,000	$29.18	$145,900	Direct
Mar 5, 2026	ACMR ACM Research, Inc.	Sale(S)	5,000	$50.09	$250,450	Direct
Aug 12, 2025	ACMR ACM Research, Inc.	Award(A) Stock Option	20,000	-	-	Direct
Mar 15, 2025	ACMR ACM Research, Inc.	Award(A) Stock Option	10,000	-	-	Direct

1-8 of 8 transactions

About Pappis Charles C

Pappis Charles C (SEC CIK 0001475345) files insider reports with the SEC as Director of ACM Research, Inc. (ACMR).

Signal8 holds 6 ownership filings by Pappis Charles C (1 Form 3, 5 Form 4), filed between May 21, 2025 and Aug 26, 2026. Those filings report 8 transactions, from Mar 15, 2025 to Aug 12, 2026. Signal8's Form 4 history starts in Sep 2024.

The business address on Pappis Charles C's filings is in FREMONT, CA.

Recent filings by Pappis Charles C

Aug 12, 2026: Grants or awards of ACMR derivative securities (2 lines, Form 4, code A).
Apr 17, 2026: Option exercise of ACMR shares (Form 4, code M).
Apr 17, 2026: Open-market sale of ACMR shares (Form 4, code S).
Mar 5, 2026: Option exercise of ACMR shares (Form 4, code M).
Mar 5, 2026: Open-market sale of ACMR shares (Form 4, code S).

Other insiders filing for ACM Research, Inc. (ACMR)

How to read Form 4 transaction codes