ACM Research, Inc. — Director's Dealing 2025

Nov 14, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: ACM Research, Inc. (ACMR)
CIK: 0001680062
Period of Report: 2025-11-12

Reporting Person: Feng Lisa (N/A)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-11-12	Class A Common Stock	M	15000	$5.6	Acquired	65001	Direct
2025-11-12	Class A Common Stock	S	15000	$32.76	Disposed	50001	Direct
2025-11-13	Class A Common Stock	M	15000	$5.6	Acquired	65001	Direct
2025-11-13	Class A Common Stock	S	15000	$33.77	Disposed	50001	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-11-12	Stock Option	$5.6	M	15000	Disposed	2029-04-22	Class A Common Stock (15000)	Direct
2025-11-13	Stock Option	$5.6	M	15000	Disposed	2029-04-22	Class A Common Stock (15000)	Direct

Footnotes

F1: On November 12, 2025, the reporting person exercised a previously issued stock option to purchase 15,000 shares of Class A Common Stock of the Issuer.

F2: The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 13, 2025.

F3: On November 13, 2025, the reporting person exercised a previously issued stock option to purchase 15,000 shares of Class A Common Stock of the Issuer.

F4: The option is fully vested and exercisable.