DESCRIPTION OF BUSINESS (Tables)

12 Months Ended

Dec. 31, 2021

DESCRIPTION OF BUSINESS [Abstract]

Direct or Indirect Interests of Subsidiaries

The Company has direct or indirect interests in the following subsidiaries:

	Place and date of	Effective interest held as at December 31,
Name of subsidiaries	incorporation	2021	2020
ACM Research (Shanghai), Inc.	PRC, May 2005	82.5%	91.7%
ACM Research (Wuxi), Inc.	PRC, July 2011	82.5%	91.7%
CleanChip Technologies Limited	Hong Kong, September 2017	82.5%	91.7%
ACM Research Korea CO., LTD.	Korea, December 2017	82.5%	91.7%
Shengwei Research (Shanghai), Inc.	PRC, March 2019	82.5%	91.7%
ACM Research (CA), Inc.	USA, April 2019	82.5%	91.7%
ACM Research (Cayman), Inc.	Cayman Islands, April 2019	100.0%	100.0%
ACM Research (Singapore) PTE. Ltd.	Singapore, August 2021	100.0%	NM