Charles C. Pappis - 12 Aug 2026 Form 4 Insider Report for ACM Research, Inc. (ACMR)

Reporting relationship: Director
Issuer ticker: ACMR
Reported as of: 12 Aug 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 26 Aug 2026, 21:30:15 UTC
Prior SEC filing: 21 Apr 2026
Source filing: View source filing
Reporting owner signature: /s/ Mark McKechnie, Attorney-in-Fact for Charles

Key filing fact

Charles C. Pappis filed Form 4 for ACM Research, Inc. (ACMR) on 26 Aug 2026.

Key facts

This page summarizes Charles C. Pappis's Form 4 filing for ACM Research, Inc. (ACMR).
2 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 26 Aug 2026, 21:30.

Change

Previous filing in this sequence was filed on 21 Apr 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001475345 Primary reporting owner

Pappis Charles C

Relationship: Director
Address: C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I, FREMONT
Signature: /s/ Mark McKechnie, Attorney-in-Fact for Charles
Signature date: 26 Aug 2026

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ACMR transaction Derivative

Stock Option

Award

Transaction value
Shares: +6,400
Change %
Price: $0.000000^*
Shares after: 6,400
Date: 12 Aug 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 6,400
Exercise price: $81.26
Footnotes: F1

ACMR transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +728
Change %
Price: $0.000000^*
Shares after: 728
Date: 12 Aug 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 728
Exercise price: $96.13
Footnotes: F2, F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 3 footnotes

Footnote F1

The option will vest and become exercisable immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service through the vesting date.

Footnote F2

The price per restricted stock unit is based on the average closing market price of the Issuer's common stock for the 30 trading days preceding the grant day.

Footnote F3

The restricted stock units should be vested immediately prior to the 2027 annual meeting of stockholders of the issuer, subject to continued service.