UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Title of Each Class Trading Symbol Name of Each Exchange on which Registered Class A Common Stock, $0.0001 par value ACMR Nasdaq Global Market FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _________ to __ ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Title of Each Class Trading Symbol Name of Each Exchange on which Registered Class A Common Stock, $0.0001 par value ACMR Nasdaq Global Market Emerging growth company ☑ FORM 10‑K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _________ to _____________ Commission file number: 001-38273 ACM Research, Inc. (Exact Name of Registrant as Specified in Its Charter) Delaware 94-3290283 ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Title of Each Class Trading Symbol(s) Name of Each Exchange on which Registered Class A Common Stock, $0.0001 par value per share ACMR Nasdaq Global Market Large accelerated filer ☐ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☑ Emerging growth company ☑ Class Number of Shares Outstanding Class A Common Stock, $0.0001 par value 14,259,479 shares outstanding as of August 5, 2019 Class B Common Stock, $0.0001 par ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 | --- | --- | --- | |----------------------------------------------------------------|--------------------------------------------------------|--------------------------------------| | | | ...

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from _________ to _____________ Commission file number: 001-38273 0 ACM Research, Inc. (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdicti ...