Business Description

DESCRIPTION OF BUSINESS ACM Research, Inc. (“ACM” or “ACM Research”) and its subsidiaries (collectively with ACM, the “Company”) develop, manufacture and sell capital equipment, or tools to the global semiconductor industry. The Company has direct or indirect interests in the following subsidiaries: Place and date of incorporation Principal Activities Effective interest held as at December 31, Name of subsidiaries 2025 2024 ACM Research (Shanghai), Inc. ("ACM Shanghai") Mainland China, May 2005 Principal operating subsidiary 74.6 % 81.5 % ACM Research (Wuxi), Inc. ("ACM Wuxi") Mainland China, July 2011 Sales and services 74.6 % 81.5 % CleanChip Technologies Limited ("CleanChip") Hong Kong, June 2017 Trading partner between ACM Shanghai and its customers 74.6 % 81.5 % ACM Research Korea CO., LTD. ("ACM Korea") Republic of Korea ("South Korea"), December 2017 Sales, marketing, R&D, production 74.6 % 81.5 % ACM Research (Lingang), Inc. ("ACM Lingang") (1) Mainland China, March 2019 Management of production activities 74.6 % 81.5 % ACM Research (CA), Inc. ("ACM California") USA, April 2019 Procurement for ACM Shanghai 74.6 % 81.5 % ACM Research (Cayman), Inc. Cayman Islands, April 2019 Administrative function (inactive) 100.0 % 100.0 % ACM Research (Singapore) PTE. Ltd. ("ACM Singapore") Singapore, August 2021 Sales, marketing, business development 100.0 % 100.0 % ACM Research (Beijing), Inc. ("ACM Beijing") Mainland China, February 2022 Sales and services 74.6 % 81.5 % Hanguk ACM CO., LTD South Korea, March 2022 Sales, services, business development 100.0 % 100.0 % Yusheng Micro Semiconductor (Shanghai) Co., Ltd. Mainland China, June 2023 Business development 74.6 % 81.5 % ACM-Wooil Microelectronics (Shanghai) Co., Ltd. Mainland China, June 2023 Component development and production 54.5 % 59.0 % ACM Research (Chengdu), Inc. ("ACM Chengdu") Mainland China, December 2024 Sales and services 74.6 % 81.5 % Shengyi Micro Semicond…