X0508 4 2023-08-10 0001680062 ACM Research, Inc. ACMR 0001721279 Cheav Sotheara C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 true See remarks false Stock Option 13.24 2023-08-10 4 A 0 100000 0 D 2033-08-09 Class A Common Stock 100000 100000 D The option will vest and become exercisable as to 25,000 shares on August 10, 2024 and the remaining 75,000 shares will vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. Senior Vice President, Manufacturing of ACM Research (Shanghai), Inc., a subsidiary of the Issuer /s/ Mark McKechnie, Attorney-in-Fact for Sotheara Cheav 2023-08-14