X0206 3 2017-11-02 0 0001680062 ACM Research, Inc. ACMR 0001721581 Dun Haiping C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 1 0 0 0 Class A Common Stock 313691 D Class B Common Stock 100000 D Stock Option 1.50 2025-05-01 Class A Common Stock 166667 D The option vested and became exercisable as to 41,666 shares on May 1, 2016 and the remaining 125,001 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. /s/ Mark L. Johnson, Attorney-in-Fact for Haiping Dun 2017-11-02