X0206 3 2017-11-02 0 0001680062 ACM Research, Inc. ACMR 0001721580 Wang David H C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT CA 94539 1 1 1 0 See Remarks Class A Common Stock 166667 D Class B Common Stock 1146934 D Class A Common Stock 60000 I By the David Hui Wang and Jing Chen Family Irrevocable Trust for Wang Children Class B Common Stock 7334 I By the David Hui Wang and Jing Chen Family Irrevocable Trust for Wang Children Class A Common Stock 206667 I By the Wang-Chen Family Living Trust Class B Common Stock 33334 I By Jing Chen, wife of David H. Wang Class B Common Stock 117334 I By Brian Wang, son of David H. Wang Class B Common Stock 117334 I By Sophia Wang, daughter of David H. Wang Stock Option 0.75 2021-05-01 Class A Common Stock 133334 D Stock Option 0.75 2021-05-01 Class A Common Stock 166667 D Stock Option 1.50 2025-05-01 Class A Common Stock 400000 D Stock Option 3.00 2026-12-27 Class A Common Stock 333334 D Stock Option 3.00 2026-12-27 Class A Common Stock 18334 I By Sophia Wang, daughter of David H. Wang Option was fully vested on May 1, 2011. Option was fully vested on May 1, 2011. The option vested and became exercisable as to 100,000 shares on May 1, 2016 and the remaining 300,000 shares vest and become exercisable in equal monthly installments over the following 36 months, subject to continued service through each vesting date. The option will vest and become exercisable as to 83,333 shares on January 1, 2018 and the remaining 250,001 shares will 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 9,167 shares on July 5, 2017 and the remaining 9,167 shares vest and become exercisable in equal monthly installments over the following 12 months, subject to continued service through each vesting date. Chief Executive Officer, President and Director /s/ Mark L Johnson, Attorney-in-Fact for David H. Wang 2017-11-02