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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1680062	Acm Research Inc.	ACMR	Special Industry Machinery, Nec (3559)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1721583	Yinan Xiang	C/O Acm Research, Inc. 42307 Osgood Road, Suite I Fremont CA 94539		No	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Class A Common Stock	Disposition	2021-08-23	35,136	$85.03	1,390,799	No	4	S	Indirect	See footnote
Class A Common Stock	Disposition	2021-08-24	33,000	$86.08	1,357,799	No	4	S	Indirect	See footnote
Class A Common Stock	Disposition	2021-08-24	200,000	$88.11	1,157,799	No	4	S	Indirect	See footnote
Class A Common Stock	Disposition	2021-08-24	11,629	$88.97	1,146,170	No	4	S	Indirect	See footnote

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote
No	4	S	Indirect	See footnote

Footnotes

The sale reported on this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.
The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $85.00 to $85.28, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnotes 2 and 4 of this Form 4.
These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which designated the reporting person to the board of directors of the Issuer. The reporting person disclaims beneficial ownership of the shares owned by Shanghai Science and Technology Venture Capital Co., Ltd. except to the extent of her pecuniary interest therein, and this report shall not be deemed an admission that such reporting person is the beneficial owner of such securities for purposes of Section 16 or otherwise.
The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $87.80 to $88.37, inclusive.