X0508 4 2023-08-10 0001680062 ACM Research, Inc. ACMR 0001721299 Liu Tracy C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 true false Stock Option 13.24 2023-08-10 4 A 0 30000 0 D 2033-08-09 Class A Common Stock 30000 30000 D Stock Option 13.24 2023-08-10 4 A 0 24000 0 D 2033-08-09 Class A Common Stock 24000 24000 D The option will vest and become exercisable as to 7,500 shares on August 10, 2024 and the remaining 22,500 shares will vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. The option will vest and become exercisable immediately prior to the 2024 annual meeting of stockholders of the issuer, subject to continued service through the vesting date. /s/ Mark McKechnie, Attorney-in-Fact for Tracy Liu 2023-08-14