X0508 4 2023-08-10 0001680062 ACM Research, Inc. ACMR 0001721580 Wang David H C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 true true true See remarks false Stock Option 13.24 2023-08-10 4 A 0 1080000 0 D 2033-08-09 Class A Common Stock 1080000 1080000 D The option will vest and become exercisable as to 270,000 shares on August 10, 2024 and the remaining 810,000 shares will vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. Chief Executive Officer, President and Director /s/ Mark McKechnie, Attorney-in-Fact for David H. Wang 2023-08-14