ACM Research, Inc. — Director's Dealing 2025

Dec 8, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ACM Research, Inc. (ACMR)
CIK: 0001680062
Period of Report: 2025-12-04

Reporting Person: McKechnie Mark (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-04	Class A Common Stock	M	8750	$4.55	Acquired	9650	Direct
2025-12-04	Class A Common Stock	S	7754	$33.5	Disposed	1896	Direct
2025-12-04	Class A Common Stock	S	996	$34.26	Disposed	900	Direct
2025-12-08	Class A Common Stock	M	22500	$25.45	Acquired	23400	Direct
2025-12-08	Class A Common Stock	S	22500	$35.45	Disposed	900	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-12-04	Stock Option	$4.55	M	8750	Disposed	2029-11-03	Class A Common Stock (8750)	Direct
2025-12-08	Stock Option	$25.45	M	22500	Disposed	2032-03-03	Class A Common Stock (22500)	Direct

Footnotes

F1: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025.

F2: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $33.07 to $34.04, 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) and (3) to this Form 4.

F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $34.26 to $34.27, inclusive.

F4: The option is fully vested and exercisable.