X0306 4 2022-08-12 0001680062 ACM Research, Inc. ACMR 0001775007 McKechnie Mark C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 true See Remarks Stock Option 19.49 2022-08-12 4 A 0 100000 0 A 2032-08-11 Class A Common Stock 100000 100000 D The option will vest and become exercisable as to 25,000 shares on August 12, 2023 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. Chief Financial Officer, Executive Vice President and Treasurer /s/ Mark McKechnie 2022-08-16