X0206 3 2017-11-02 0 0001680062 ACM Research, Inc. ACMR 0001721299 Liu Tracy C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 1 0 0 0 Class A Common Stock 2400 D Stock Option 3.00 2026-12-27 Class A Common Stock 50000 D Stock Option 3.00 2026-12-27 Class A Common Stock 16667 D The option vested and became exercisable as to 12,500 shares on September 29, 2017 and the remaining 37,500 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. The option vests and becomes exercisable as follows: (a) one-third vested on December 28, 2016; (b) one-third vested on January 1, 2017; and (c) one-third will vest on January 1, 2018. /s/ Mark L. Johnson, Attorney-in-Fact for Tracy Liu 2017-11-02