Fuping Chen - 02 Dec 2025 Form 4 Insider Report for ACM Research, Inc. (ACMR)

Reporting relationship: Vice President, Sales-China of ACM Research (Shanghai), Inc., a subsidiary of the Issuer
Issuer ticker: ACMR
Reported as of: 02 Dec 2025
Net transaction value: -$3,768,756
SEC form: 4
Accepted by SEC: 04 Dec 2025, 16:30:15 UTC
Prior SEC filing: 24 Sep 2024
Source filing: View source filing
Reporting owner signature: /s/ Mark McKechnie, Attorney-in-Fact for Fuping Chen

Key filing fact

Fuping Chen filed Form 4 for ACM Research, Inc. (ACMR) on 04 Dec 2025.

Key facts

This page summarizes Fuping Chen's Form 4 filing for ACM Research, Inc. (ACMR).
7 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 04 Dec 2025, 16:30.

Change

Previous filing in this sequence was filed on 24 Sep 2024.
Current net transaction value: -$3,768,756.

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 0001729184 Primary reporting owner

Chen Fuping

Relationship: Vice President, Sales-China of ACM Research (Shanghai), Inc., a subsidiary of the Issuer
Address: C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I, FREMONT
Signature: /s/ Mark McKechnie, Attorney-in-Fact for Fuping Chen
Signature date: 04 Dec 2025

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ACMR transaction

Class A Common Stock

Options Exercise

Transaction value: $177,000
Shares: +100,000
Change %
Price: $1.77
Shares after: 100,000
Date: 02 Dec 2025
Ownership: Direct

ACMR transaction

Class A Common Stock

Sale

Transaction value: $3,320,000
Shares: -100,000
Change %: -100%
Price: $33.20
Shares after: 0
Date: 02 Dec 2025
Ownership: Direct
Footnotes: F1, F2

ACMR transaction

Class A Common Stock

Options Exercise

Transaction value: $35,400
Shares: +20,000
Change %
Price: $1.77
Shares after: 20,000
Date: 03 Dec 2025
Ownership: Direct

ACMR transaction

Class A Common Stock

Sale

Transaction value: $651,085
Shares: -19,700
Change %: -98%
Price: $33.05
Shares after: 300
Date: 03 Dec 2025
Ownership: Direct
Footnotes: F1, F3

ACMR transaction

Class A Common Stock

Sale

Transaction value: $10,071
Shares: -300
Change %: -100%
Price: $33.57
Shares after: 0
Date: 03 Dec 2025
Ownership: Direct
Footnotes: F1, F4

Reported derivative securities

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

ACMR transaction Derivative

Stock Option

Options Exercise

Transaction value: $0
Shares: -100,000
Change %: -71%
Price: $0.000000
Shares after: 41,165
Date: 02 Dec 2025
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 100,000
Exercise price: $1.77
Footnotes: F5

ACMR transaction Derivative

Stock Option

Options Exercise

Transaction value: $0
Shares: -20,000
Change %: -49%
Price: $0.000000
Shares after: 21,165
Date: 03 Dec 2025
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 20,000
Exercise price: $1.77
Footnotes: F5

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

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 5 footnotes

Footnote F1

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 28, 2025.

Footnote F2

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $32.75 to $33.67, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (2), (3), and (4) to this Form 4.

Footnote F3

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $32.51 to $33.48, inclusive.

Footnote F4

The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $33.53 to $33.59, inclusive.

Footnote F5

The option is fully vested and exercisable.

SEC remarks

Vice President, Sales-China of ACM Research (Shanghai), Inc., a subsidiary of the Issuer