ACMR ACM Research Inc

FORM 4 [ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).         
UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES                                                                                   
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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940                       

1. Name and Address of Reporting Person * Xiang Yinan	2. Issuer Name and Ticker or Trading Symbol ACM Research, Inc. [ ACMR ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director                    _____ 10% Owner _____ Officer (give title below)    _____ Other (specify below)
(Last)          (First)          (Middle) C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I	3. Date of Earliest Transaction (MM/DD/YYYY) 12/18/2020
(Street) FREMONT, CA 94539 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	12/18/2020		S(1)		82454	D	$75.3 (2)	1549681	I	See Footnote (3)
Class A Common Stock	12/18/2020		S(1)		1699	D	$76.1 (4)	1547982	I	See Footnote (3)
Class A Common Stock	12/21/2020		S(1)		26892	D	$75.08 (5)	1521090	I	See Footnote (3)
Class A Common Stock	12/22/2020		S(1)		14920	D	$75	1506170	I	See Footnote (3)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:
(1)	The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by Shanghai Science and Technology Venture Capital Co., Ltd.
(2)	The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.00 to $75.91, 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, 4 and 5 of this Form 4.
(3)	These shares are owned by Shanghai Science and Technology Venture Capital Co., Ltd., which exercised a contractual right in designating 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.
(4)	The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $76.00 to $76.13, inclusive.
(5)	The price reported in Column 4 represents a weighted average price. The shares were sold in multiple transactions at prices ranging from $75.00 to $75.50, inclusive.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Xiang Yinan C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT, CA 94539	X

Signatures
/s/ Mark L. Johnson, Attorney-in-Fact for Yinan Xiang		12/22/2020
**Signature of Reporting Person		Date