Sec Form 4 Filing - Wang David H @ ACM Research, Inc. - 2019-08-23

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 Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Wang David H 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 X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) See remarks (Last) (First) (Middle) C/O ACM RESEARCH, INC., 42307 OSGOOD ROAD, SUITE I 3. Date of Earliest Transaction (MM/DD/YY) 08/23/2019 (Street) FREMONT, CA94539 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction 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 08/23/2019 D 28,661 D $ 13.195 ( 1 ) 168,006 D Class A Common Stock 15,279 I By Sophia Wang, daughter of David H. Wang Class A Common Stock 60,000 I By David Hui Wang and Jing Chen Family Irrevocable Trust for Wang Children Class A Common Stock 206,667 I By Wang-Chen Family Living Trust

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Wang David H C/O ACM RESEARCH, INC. 42307 OSGOOD ROAD, SUITE I FREMONT, CA94539 X X See remarks Signatures /s/ Mark L. Johnson, Attorney-in-Fact for David H. Wang 08/27/2019 Signature of Reporting Person Date

Explanation of Responses:

( 1 )In connection with a public offering of Class A Common Stock by the Issuer, the reporting person and certain other stockholders entered into an Equity Purchase Agreement dated August 4, 2019 pursuant to which the reporting person and such stockholders agreed to sell, and the Issuer agreed to purchase, shares of the Issuer's Common Stock funded by the net proceeds, if any, from the Issuer's sale of Class A Common Stock pursuant to an exercise of the underwriters' over-allotment option. The transaction being reported relates to the reporting person's sale under the Equity Purchase Agreement. The obligations of the parties to the Equity Purchase Agreement became fixed and irrevocable as of the transaction date, which is the date of the closing of the underwriters' over-allotment option.

Remarks: Chief Executive Officer, President and Director

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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