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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
1721279	Sotheara Cheav	C/O Acm Research, Inc. 42307 Osgood Road, Suite I Fremont CA 94539	See Remarks	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
Class A Common Stock	Acquisiton	2020-09-10	5,000	$0.75	48,334	No	4	M	Direct
Class A Common Stock	Disposition	2020-09-10	5,000	$60.75	43,334	No	4	S	Direct
Class A Common Stock	Acquisiton	2020-09-14	4,941	$0.75	48,275	No	4	M	Direct
Class A Common Stock	Disposition	2020-09-14	4,941	$66.70	43,334	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Class A Common Stock	Stock Option	Disposition	2020-09-10	5,000	$0.00	5,000	$0.75
Class A Common Stock	Stock Option	Disposition	2020-09-14	4,941	$0.00	4,941	$0.75

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
4,941		2021-05-01	No	4	M	Direct
0		2021-05-01	No	4	M	Direct

Footnotes

On September 10, 2020, the reporting person exercised a previously issued stock option to purchase 5,000 shares of Class A Common Stock of the Issuer.
The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person.
On September 14, 2020, the reporting person exercised a previously issued stock option to purchase 4,941 shares of Class A Common Stock of the Issuer.
The option is fully vested and exercisable.