X0206 3 2017-11-02 0 0001680062 ACM Research, Inc. ACMR 0001316320 Hu Chenming C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 1 0 0 0 Stock Option 3.00 2026-12-27 Class A Common Stock 83334 D Stock Option 3.00 2026-12-27 Class A Common Stock 33334 D Stock Option 7.50 2027-03-08 Class A Common Stock 33334 D The option vested and became exercisable as to 20,833 shares on May 1, 2017 and the remaining 62,501 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. The option vested and became exercisable as to 8,334 shares, and the remaining shares will vest, in part or in full, solely upon the achievement of certain performance milestones, as determined by the Compensation Committee of the Board of Directors of the Issuer. The option will vest and become exercisable as to 8,333 shares on January 1, 2018 and the remaining 25,001 shares will 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 Chenming Hu 2017-11-02