X0206 3 2017-11-02 0 0001680062 ACM Research, Inc. ACMR 0001721376 Chen Fufa C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 0 1 0 0 See Remarks Class A Common Stock 73334 D Stock Option 0.75 2021-05-01 Class A Common Stock 33334 D Stock Option 1.50 2025-05-01 Class A Common Stock 33334 D The option is fully vested and exercisable. The option vested and became exercisable as to 8,333 shares on May 1, 2016 and the remaining 25,001 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. Vice President, Sales of ACM Research (Shanghai), Inc., a subsidiary of the Issuer /s/ Mark L. Johnson, Attorney-in-Fact for Fufa Chen 2017-11-02