144 0001721299 XXXXXXXX LIVE 0001680062 ACM RESEARCH, INC. 001-38273 42307 Osgood Road, Suite I Fremont CA 94539 (510) 445-3700 TRACY DONG LIU Director Common Morgan Stanley Smith Barney LLC Executive Financial Services

1 New York Plaza 8th Floor New York NY 10004

15000 718666.50 65705783 03/11/2026 NASDAQ Common 03/11/2026 Stock Option Exercise ISSUER N 15000 03/11/2026 Cash N TRACY DONG LIU

42307 Osgood Road, Suite I Fremont CA 94539

Common 03/10/2026 45000 2132248.50 03/11/2026 12/04/2025 /s/ Tracy Dong Liu