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ACM Research
Annual Report 2023

ACMR · NASDAQ Technology
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FY2023 Annual Report · ACM Research
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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, 2023

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
(State or Other Jurisdiction of Incorporation or Organization)

42307 Osgood Road, Suite I, Fremont, California
(Address of Principal Executive Offices)

94-3290283
(I.R.S. Employer Identification No.)

94539
(Zip Code)

Registrant’s telephone number, including area code: (510) 445-3700

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class

Class A Common Stock, $0.0001 par value

Trading Symbol

ACMR

Name of Each Exchange on which Registered

The NASDAQ Stock Market LLC

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes  No ☑

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act. Yes  No ☑

Securities registered pursuant to Section 12(g) of the Act: None.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such
shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes ☑ No 

Indicate by check mark whether the registrant has submitted electronically every Interactive Data file required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter)
during the preceding 12 months (or for such shorter period that the registrant was required to submit such files). Yes ☑ No 

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definitions of
“large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer
Non-accelerated filer

☑


Accelerated filer
Smaller reporting company
Emerging growth company





If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards
provided pursuant to Section 13(a) of the Exchange Act. 

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of internal control over financial reporting under Section
404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☑

If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included in the filing reflect the correction of an error to
previously issued financial statements. 

Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensation received by any of the registrant’s executive
officers during the relevant recovery period pursuant to §240.10D-1(b). 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act). Yes  No ☑

The aggregate market value on June 30, 2023 (the last business day of the registrant’s most recently completed second quarter) of the voting common equity held by non-affiliates of the registrant,
computed by reference to the $13.08 closing price of the stock on that date, was $637.4 million. The registrant does not have non-voting common equity outstanding.

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest practicable date.

Class A Common Stock, $0.0001 par value
Class B Common Stock, $0.0001 par value

Class

56,073,205 shares outstanding as of February 23, 2024
5,021,811 shares outstanding as of February 23, 2024

Number of Shares Outstanding

Documents Incorporated By Reference
The registrant intends to file a proxy statement pursuant to Regulation 14A within 120 days of the end of the fiscal year ended December 31, 2023. Portions of such proxy statement are incorporated
by reference in Part III of this report.

Table of Contents

Item 1
Item 1A
Item 1B
Item 1C
Item 2
Item 3
Item 4

Item 5
Item 6
Item 7
Item 7A
Item 8
Item 9
Item 9A
Item 9B
Item 9C

Item 10
Item 11
Item 12
Item 13
Item 14

TABLE OF CONTENTS

PART I

Business
Risk Factors
Unresolved Staff Comments
Cybersecurity
Properties
Legal Proceedings
Mine Safety Disclosures

PART II

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
[Reserved]
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures About Market Risk
Financial Statements and Supplementary Data
Changes in and Disagreements with Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information
Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

Directors, Executive Officers and Corporate Governance
Executive Compensation
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Certain Relationships and Related Transactions, and Director Independence
Principal Accountant Fees and Services

PART III

Item 15
Item 16
Signatures

Exhibits and Financial Statement Schedules
Form 10-K Summary

PART IV

7
19
51
52
52
53
53

53
54
54
81
83
127
128
130
130

130
130
131
131
131

131
135
136

ACM Research, Inc., or ACM Research, is a Delaware corporation founded in California in 1998 to supply capital equipment developed for the global semiconductor industry. Since 2005, ACM
Research has conducted its business operations principally through its subsidiary ACM Research (Shanghai), Inc., or ACM Shanghai, a limited liability corporation formed by ACM Research in the
People’s  Republic  of  China,  or  mainland  China,  in  2005.  Unless  the  context  requires  otherwise,  references  in  this  report  to  “our  company,”  “our,”  “us,”  “we”  and  similar  terms  refer  to  ACM
Research, Inc. and its subsidiaries, including ACM Shanghai, collectively.

Our principal corporate office is located in Fremont, California. We conduct a substantial majority of our product development, manufacturing, support and services in mainland China through ACM
Shanghai. We perform, through a subsidiary of ACM Shanghai, additional product development and subsystem production in Korea, and we conduct, through ACM Research, sales and marketing
activities focused on sales of ACM Shanghai products in North America, Europe and certain regions in Asia outside mainland China.

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ACM Research is not a mainland China operating company, and we do not conduct our operations in mainland China through the use of a variable interest entity, or VIE, or any other structure
designed for the purpose of avoiding mainland China legal restrictions on direct foreign investments in mainland China-based companies. ACM Research has a direct ownership interest in ACM
Shanghai as the result of its holding 82.1% of the outstanding shares of ACM Shanghai. Stockholders of ACM Research may never directly own equity interests in ACM Shanghai. We do not
believe that our corporate structure or any other matters relating to our business operations require that we obtain any permissions or approvals from the China Securities Regulatory Commission,
the Cyberspace Administration of China, or any other mainland China central government authority in order to continue to list shares of Class A common stock of ACM Research on the Nasdaq
Global Market. This determination was based on the facts aforementioned and mainland China Company Law, mainland China Securities Law, cybersecurity regulations and other relevant laws,
regulations and regulatory requirements in mainland China currently in effect. However, if this determination proves to be incorrect, then it could have a material adverse effect on ACM Research.
See “Item IA. Risk Factors— Risks Related to International Aspects of Our Business—If any mainland China central government authority were to determine that existing mainland China laws or
regulations require that ACM Shanghai obtain the authority’s permission or approval to continue the listing of ACM Research’s Class A common stock in the United States or if those existing
mainland China laws and regulations, or interpretations thereof, were to change to require such permission or approval, ACM Shanghai may be unable to obtain the required permission or approval
or may only be able to obtain such permission or approval on terms and conditions that impose material new restrictions and limitations on operation of ACM Shanghai, either of which could have a
material adverse effect on our business, financial condition, results of operations, reputation and prospects and on the trading price of ACM Research Class A common stock, which could decline in
value or become worthless.”

The  business  of  ACM  Shanghai  is  subject  to  complex  laws  and  regulations  in  mainland  China  that  can  change  quickly  with  little  or  no  advance  notice.  To  date,  beyond  the  COVID-19-related
restrictions in 2022, we have not experienced such intervention or influence by mainland China central government authorities or a change in those authorities’ rules and regulations that have had a
material impact on ACM Shanghai or ACM Research.

In addition, in the ordinary course of business, ACM Shanghai is required to obtain certain operating permits and licenses necessary for it to operate in mainland China, including business licenses,
certifications relating to quality management standards, import and export-related qualifications from customs, as well as environmental and construction permits, licenses and approvals relating to
construction projects. We believe ACM Shanghai has all such required permits and licenses. However, from time to time the mainland China government issues new regulations, which may require
additional  actions  on  the  part  of  ACM  Shanghai  to  comply.  If  ACM  Shanghai  does  not,  or  is  unable  to,  obtain  any  such  additional  permits  or  licenses,  ACM  Shanghai  may  be  subjected  to
restrictions  and  penalties  imposed  by  the  relevant  mainland  China  regulatory  authorities,  and  it  could  have  a  material  adverse  effect  on  our  business,  financial  condition,  results  of  operations,
reputation and prospects and on the trading price of ACM Research Class A common stock, which could decline in value or become worthless.

The following chart depicts our corporate organization as of December 31, 2023:

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A detailed description of how cash is transferred through our organization is set forth under "Note 2 — Summary of Significant Accounting Policies - Cash and Cash Equivalents" to the Condensed
Consolidated Financial Statements of this report.

The U.S. Holding Foreign Companies Accountable Act, or the HFCA Act, requires that the Public Company Accounting Oversight Board, or the PCAOB, determine whether it is unable to inspect
or investigate completely registered public accounting firms located in a non-U.S. jurisdiction because of a position taken by one or more authorities in any non-U.S. jurisdiction. BDO China Shu
Lun Pan Certified Public Accountants LLP, or BDO China, had been our independent registered public accounting firm in recent years, including for the year ended December 31, 2021. On June 22,
2021, the U.S. Senate passed the Accelerating Holding Foreign Companies Accountable Act, which was enacted on December 29, 2022 under the Consolidated Appropriations Act, 2023, as further
described below. On December 16, 2021, the PCAOB reported its determination that it was unable to inspect or investigate completely registered public accounting firms headquartered in mainland
China and Hong Kong, including BDO China, because of positions taken by mainland China authorities in those jurisdictions. On March 30, 2022, based on this determination, ACM Research was
transferred  to  the  SEC’s  “Conclusive  list  of  issuers  identified  under  the  HFCA.”  See  “Item  1A.  Risk  Factors—Risks  Related  to  International  Aspects  of  Our  Business—We  could  be  adversely
affected  if  we  are  unable  to  comply  with  recent  and  proposed  legislation  and  regulations  regarding  improved  access  to  audit  and  other  information  and  audit  inspections  of  accounting  firms
operating in mainland China” of this report for more information. Under current regulations, if ACM Research were to be included on this list for two consecutive years due to our independent
auditor being located in a jurisdiction that does not allow for PCAOB inspections, the SEC would prohibit trading in our securities and this ultimately could cause our securities to be delisted in the
U.S., and their value may significantly decline or become worthless.

On December 15, 2022, the PCAOB announced that it was able to secure complete access to inspect and investigate PCAOB-registered public accounting firms headquartered in mainland China
and Hong Kong in 2022 and vacated its previous December 16, 2021 determination to the contrary. However, whether the PCAOB will continue to be able to satisfactorily conduct inspections of
PCAOB-registered public accounting firms headquartered in mainland China and Hong Kong is subject to uncertainty and depends on a number of factors out of our, and our auditor’s, control.
mainland China authorities will need to ensure that the PCAOB continues to have full access for inspections and investigations in 2023 and beyond. Each year, the PCAOB will determine whether it
can inspect and investigate completely audit firms in mainland China and Hong Kong, among other jurisdictions. On December 29, 2022, the Consolidated Appropriations Act, 2023, was signed
into law by U.S. President Biden, which, among other things, amended the HFCA Act to reduce the number of consecutive non-inspection years that would trigger the trading prohibition under the
HFCA Act from three years to two years (originally such threshold under the HFCA Act was three consecutive years), and so that any foreign jurisdiction could be the reason why the PCAOB does
not have complete access to inspect or investigate a company’s public accounting firm (originally the HFCA Act only applied if the PCAOB’s ability to inspect or investigate was due to a position
taken  by  an  authority  in  the  jurisdiction  where  the  relevant  public  accounting  firm  was  located).  Therefore,  if  the  mainland  China  authorities  do  not  allow  the  PCAOB  complete  access  for
inspections and investigations for two consecutive years, the SEC would prohibit trading in the securities of issuers engaging those audit firms, as required under the HFCA Act.

On June 30, 2022, and June 15, 2023, stockholders of ACM Research ratified the appointment of Armanino LLP, or Armanino, as our independent auditor for the years ended December 31, 2022
and 2023, respectively. Armanino was neither headquartered in mainland China or Hong Kong nor was it subject to the determinations announced by the PCAOB on December 16, 2021, which
determinations were vacated by the PCAOB on December 15, 2022. On July 21, 2023, we were informed by Armanino, that Armanino would resign as our independent auditor effective as of the
earlier of (a) the date we engaged a new independent registered public accounting firm or (b) the filing of our Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2023.

On September 14, 2023, the Audit Committee of the Board of Directors, or the Audit Committee, completed a competitive selection process to select and appoint a new accounting firm to serve as
our  independent  registered  public  accounting  firm  commencing  with  the  audit  of  our  financial  statements  for  the  fiscal  year  ended  December  31,  2023.  As  a  result  of  this  process,  the  Audit
Committee approved the engagement of Ernst & Young Hua Ming LLP, or E&Y as our independent registered public accounting firm for the fiscal year ended December 31, 2023. The engagement
of  E&Y  became  effective  on  September  20,  2023.  E&Y  is  a  PCAOB-registered  firm  that  is  headquartered  in  mainland  China;  however,  we  do  not  believe  ACM  Research  will  appear  on  the
“Conclusive list of issuers identified under the HFCAA” for a second consecutive time, as the determinations announced by the PCAOB on December 16, 2021 were vacated by the PCAOB on
December 15, 2022.

In addition to the matters discussed above, we are also subject to a number of legal and operational risks associated with our corporate structure, including as the result of a substantial portion of our
operations being conducted in mainland

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China. Consequences of any of those risks could result in a material adverse change in our operations or cause the value of ACM Research Class A common stock to significantly decline in value or
become worthless. Please carefully read the information included in “Item 1A. Risk Factors” of this report, in particular the risk factors addressing the following issues:

•

•

•

If  any  mainland  China  central  government  authority  were  to  determine  that  existing  mainland  China  laws  or  regulations  require  that  ACM  Shanghai  obtain  the  authority’s  permission  or
approval to continue the listing of ACM Research’s Class A common stock in the United States or if those existing mainland China laws and regulations, or interpretations thereof, were to
change to require such permission or approval, or if we inadvertently conclude that such permissions or approvals are not required, ACM Shanghai may be unable to obtain the required
permission  or  approval  or  may  only  be  able  to  obtain  such  permission  or  approval  on  terms  and  conditions  that  impose  material  new  restrictions  and  limitations  on  operation  of  ACM
Shanghai, either of which could have a material adverse effect on our business, financial condition, results of operations, reputation and prospects and on the trading price of ACM Research
Class A common stock, which could decline in value or become worthless.
mainland China central government authorities may intervene in, or influence, ACM Shanghai’s mainland China-based operations at any time, and those authorities’ rules and regulations in
mainland China can change quickly with little or no advance notice.
The mainland China central government may determine to exert additional control over offerings conducted overseas or foreign investment in mainland China-based issuers, which could
result in a material change in operations of ACM Shanghai and cause significant declines in the value of ACM Research Class A common stock, or make them worthless.

Recent statements and regulatory actions by mainland China central government authorities with respect to the use of VIEs and to data security and anti-monopoly concerns have not affected our
ability  to  conduct  our  business  operations  in  China.  For  further  information,  see  “Item  1A.  Risk  Factors—Risks  Related  to  International  Aspects  of  Our  Business”  of  this  report  for  more
information.

For purposes of this report, certain amounts in Renminbi, or RMB, have been translated into U.S. dollars solely for the convenience of the reader. The translations have been made based on the
conversion rates published by the State Administration of Foreign Exchange of the People’s Republic of China.

SAPS, TEBO, ULTRA C, ULTRA Fn, Ultra ECP, Ultra ECP map, and Ultra ECP ap are trademarks of ACM Research. For convenience, these trademarks appear in this report without ™ symbols,
but that practice does not mean that ACM Research will not assert, to the fullest extent under applicable law, ACM Research’s rights to the trademarks. This report also contains other companies’
trademarks, registered marks and trade names, which are the property of those companies.

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FORWARD-LOOKING STATEMENTS AND STATISTICAL DATA

This report contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements, other than statements of historical facts, included in this
report regarding our strategy, future operations, future financial position, future revenue, projected costs, prospects, plans and objectives of management are forward-looking statements. In some
cases, you can identify forward-looking statements by terms such as “may,” “might,” “will,” “objective,” “intend,” “should,” “could,” “can,” “would,” “expect,” “believe,” “anticipate,” “project,”
“target,” “design,” “estimate,” “predict,” “potential,” “plan” or the negative of these terms, and similar expressions intended to identify forward-looking statements. These statements reflect our
current views with respect to future events and are based on our management’s belief and assumptions and on information currently available to our management. Although we believe that the
expectations  reflected  in  these  forward-looking  statements  are  reasonable,  these  statements  relate  to  future  events  or  our  future  operational  or  financial  performance,  and  involve  known  and
unknown  risks,  uncertainties  and  other  factors,  including  those  described  or  incorporated  by  reference  in  “Item  1A.  Risk  Factors”  of  Part  I  of  this  report,  that  may  cause  our  actual  results,
performance or achievements to be materially different from any future results, performance or achievements expressed or implied by these forward-looking statements.

The  information  included  under  the  heading  “Item  7.  Management’s  Discussion  and  Analysis  of  Financial  Condition  and  Results  of  Operations—Overview,”  of  Part  II  of  this  report  contains
statistical data and estimates, including forecasts, that are based on information provided by Gartner, Inc., or Gartner, in “Forecast: Semiconductor Wafer Fab Equipment, Worldwide, 4Q23 Update”
(December  2023),  or  the  Gartner  Report.  The  Gartner  Report  represents  research  opinions  or  viewpoints  that  are  published,  as  part  of  a  syndicated  subscription  service,  by  Gartner  and  are  not
representations of fact. The Gartner Report speaks as of its original publication date (and not as of the date of this report), and the opinions expressed in the Gartner Report are subject to change
without notice. While we are not aware of any misstatements regarding any of the data presented from the Gartner Report, estimates, and in particular forecasts, involve numerous assumptions and
are subject to risks and uncertainties, as well as change based on various factors, that could cause results to differ materially from those expressed in the data presented below.

Any forward-looking statement made by us in this report speaks only as of the date on which it is made. Except as required by law, we assume no obligation to update these statements publicly or to
update the reasons actual results could differ materially from those anticipated in these statements, even if new information becomes available in the future.

You should read this report, and the documents that we reference in this report and have filed as exhibits to this report, completely and with the understanding that our actual future results may be
materially different from what we expect. We qualify all of our forward-looking statements by these cautionary statements.

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PART I

Item 1.    Business

Overview

We supply advanced, innovative capital equipment developed for the global semiconductor industry. Fabricators of advanced integrated circuits, or chips, can use our wet-cleaning and other front-
end processing tools in numerous steps to improve product yield, even at increasingly advanced process nodes. We have designed these tools for use in fabricating foundry, logic and memory chips,
including  dynamic  random-access  memory,  or  DRAM,  and  3D  NAND-flash  memory  chips.  We  also  develop,  manufacture  and  sell  a  range  of  advanced  packaging  tools  to  wafer  assembly  and
packaging customers.

Revenue from single wafer cleaning, Tahoe and semi-critical cleaning equipment totaled $403.9 million, or 72.4% of total revenue in 2023, $272.9 million, or 70.2% of total revenue in 2022, and
$189.2  million,  or  72.8%  of  total  revenue  in  2021.  Revenue  from  ECP  (front-end  packaging),  furnace  and  other  technologies  totaled  $103.4  million,  or  18.5%  of  total  revenue,  in  2023,  $77.5
million, or 19.9% of total revenue in 2022, and $33.2 million, or 12.8% of total revenue in 2021. Revenue from advanced packaging (excluding ECP), services and spares totaled $50.5 million, or
9.1% of total revenue, in 2023, $38.4 million, or 9.9% of total revenue in 2022, and $37.3 million, or 14.4% of total revenue in 2021. Selling prices for our tools generally range from $0.5 million to
more than $5 million.

We estimate, based on third-party reports and on customer and other information, that our current product portfolio addresses approximately $16 billion of the 2023 global wafer fab equipment, or
WFE, market. By product line, we estimate an approximately $5.2 billion market opportunity is addressed by our wafer cleaning equipment, $4.3 billion by our Plasma-Enhanced Chemical Vapor
Deposition, or PECVD, equipment, $2.2 billion by our furnace equipment, $2.5 billion by our Track equipment, $800 million by our electro-chemical plating, or ECP, equipment, and more than
$900 million by our stress-free polishing, advanced packaging, wafer processing, and other processing equipment.

Based on Gartner’s estimates, the total available global market for these equipment segments decreased by 11.4% from $21.2 billion in 2022, to $18.7 billion in 2023, and is expected to decrease by
2.8% to $18.2 billion in 2024. These equipment segments are a subset of the total worldwide semiconductor WFE market, which Gartner estimates decreased by 7.7% from $100.6 billion in 2022 to
$92.9 billion in 2023, and estimates will decrease by 1.7% to $91.3 billion in 2024.

We  have  focused  our  selling  efforts  on  establishing  a  referenceable  base  of  leading  foundry,  logic  and  memory  chip  makers,  whose  use  of  our  products  can  influence  decisions  by  other
manufacturers. We believe this customer base has helped us penetrate the mature chip manufacturing markets and build credibility with additional industry leaders. We have used a “demo-to-sales”
process to place evaluation equipment, or “first tools,” with a number of selected customers.

To date, a substantial majority of our sales of single-wafer wet-cleaning equipment for front-end manufacturing have been to customers located in Asia, and we anticipate that a substantial majority
of our revenue from these products will continue to come from customers located in this region for the foreseeable future. Our operation includes sales, marketing and services personnel in North
America, Western Europe and Southeast Asia to expand and support major new customer initiatives for the products of ACM Shanghai to additional regions beyond mainland China.

We are focused on building a strategic portfolio of intellectual property to support and protect our key innovations. Our tools have been developed using our key proprietary technologies:
•

Space Alternated Phase Shift, or SAPS, technology for flat and patterned (deep via or deep trench with stronger structure) wafer surfaces. SAPS technology employs alternating phases of
megasonic waves to deliver megasonic energy in a highly uniform manner on a microscopic level. We have shown SAPS technology to be more effective than conventional megasonic and jet
spray technologies in removing random defects across an entire wafer, with increasing relative effectiveness at more advanced production nodes.
Timely Energized Bubble Oscillation, or TEBO, technology for patterned wafer surfaces at advanced process nodes. TEBO technology has been developed to provide effective, damage-free
cleaning for 2D and 3D patterned wafers with fine feature sizes. We have demonstrated the damage-free cleaning capabilities of TEBO technology on patterned wafers for feature nodes as
small as 1xnm (16 to 19 nanometers, or nm), and we have shown TEBO technology can be applied in manufacturing processes for patterned chips with 3D architectures having aspect ratios
as high as 60‑to‑1.

•

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•

•

Tahoe  technology  for  cost  and  environmental  savings.  Tahoe  technology  delivers  high  cleaning  performance  using  significantly  less  sulfuric  acid  and  hydrogen  peroxide  than  is  typically
consumed by conventional high-temperature single-wafer cleaning tools.
ECP technology for advanced metal plating. Our Ultra ECP ap, or Advanced Packaging, technology was developed for back-end assembly processes to deliver a more uniform metal layer at
the notch area of wafers prior to packaging. Our Ultra ECP map, or Multi-Anode Partial Plating, technology was developed for front-end wafer fabrication processes to deliver advanced
electrochemical  copper  plating  for  copper  interconnect  applications.  Ultra  ECP  map  offers  improved  gap-filling  performance  for  ultra-thin  seed  layer  applications,  which  is  critical  for
advanced nodes at 28nm, 14nm and beyond.

We have also introduced and delivered a range of new tools intended to broaden our revenue opportunity with global semiconductor manufacturers. Product extensions include the Ultra SFP ap tool
for advanced packaging solutions, the Ultra C VI 18-chamber single wafer cleaning tool for advanced memory devices, and the Ultra ECP 3d platform for through-silicon-via, or tsv, application.
New product lines include the Ultra fn Furnace, our first dry processing tool, and a suite of semi-critical cleaning systems which include single wafer back side cleaning, scrubber, and auto bench
cleaning tools.

We added two major new product categories in 2022 with the launch of the Ultra Pmax™ PECVD tool, which is equipped with a proprietary designed chamber, gas distribution unit and chuck, and
is intended to provide better film uniformity, reduced film stress, and improved particle performance, and the introduction of the Ultra Track tool, a 300mm process tool that delivers uniform air
downflow, fast robot handling and customizable software to address specific customer requirements, and has multiple features that enhance performance across defectivity, throughput, and cost of
ownership.

We have been issued more than 498 patents in the United States, the People’s Republic of China, or mainland China, Japan, Singapore, Korea and Taiwan.

We conduct a substantial majority of our product development, manufacturing, support and services in mainland China, with additional product development and subsystem production in Korea.
Substantially all of our integrated tools are built to order at our manufacturing facilities in the Pudong region of Shanghai, which now encompass a total of 236,000 square feet of floor space for
production capacity, with leased buildings at our Chuansha campus. In May 2020 ACM Shanghai, through its wholly owned subsidiary Shengwei Research (Shanghai), Inc., or ACM Shengwei,
entered into an agreement for a land use right in the Lingang region of Shanghai. In 2020 ACM Shengwei began a multi-year construction project for a new 1,000,000 square foot development and
production center that will incorporate state-of-the-art manufacturing systems and automation technologies and will provide floor space to support significantly increased production capacity and
related research and development, or R&D, activities. We expect to commence initial operations and production activities at our Lingang facilities in the first half of 2024 timeframe.

Our  experience  has  shown  that  chip  manufacturers  in  mainland  China  and  throughout  Asia  demand  equipment  that  meets  their  specific  technical  requirements  and  generally  prefer  to  build
relationships with local suppliers. We will continue to seek to leverage our local presence in mainland China and Korea through our subsidiaries to address the growing market for semiconductor
manufacturing equipment in the region by working closely with regional chip manufacturers to understand their specific requirements, encourage them to adopt our technologies, and enable us to
design innovative products and solutions to address their needs.

On November 18, 2021, ACM Shanghai successfully completed its initial public offering of shares of ACM Shanghai in mainland China, which we refer to as the STAR IPO, and its shares began
trading on the Shanghai Stock Exchange’s SciTech innovAtion boaRd, known as the STAR Market, which we refer to as the STAR Listing, as described under “Item 7. Management’s Discussion
and Analysis of Financial Condition and Results of Operations.”

Our Technology and Product Offerings

Wet Cleaning Equipment for Front End Production Processes

Chip fabricators can use our single-wafer wet-cleaning tools in numerous steps to improve product yield in the front-end production process, during which individual devices are patterned in a chip
prior to being interconnected on a wafer. Our wet-cleaning equipment has been developed using our proprietary SAPS, TEBO and Tahoe technologies, which allow our tools to remove random
defects from a wafer surface effectively, without damaging a wafer or its features, even at increasingly advanced process nodes (the minimum line widths on a chip) of 22nm or less. We use a
modular configuration that enables us to create a wet-cleaning tool meeting the specific requirements of a customer, while using pre-existing designs for chamber, electrical, chemical delivery and
other modules. Our modular approach supports a wide range of

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customer  needs  and  facilitates  the  adaptation  of  our  model  tools  for  use  with  the  optimal  chemicals  selected  to  meet  a  customer’s  requirements.  Our  tools  are  offered  principally  for  use  in
manufacturing chips from 300 millimeter, or mm, silicon wafers, but we also offer solutions for 150mm and 200mm wafers and for nonstandard substrates, including compound semiconductor,
quartz, sapphire, glass and plastics.

SAPS Technology, Applications and Equipment

SAPS Technology

SAPS  technology  delivers  megasonic  energy  uniformly  to  every  point  on  an  entire  wafer  by  alternating  phases  of  megasonic  waves  in  the  gap  between  a  megasonic  transducer  and  the  wafer.
Radicals for removing random defects are generated in dilute solution, and the radical generation is promoted by megasonic energy. Unlike “stationary” megasonic transducers used in conventional
megasonic cleaning methods, SAPS technology moves or tilts a transducer while a wafer rotates, enabling megasonic energy to be delivered uniformly across all points on the wafer, even if the
wafer is warped. The mechanical force of cavitations generated by megasonic energy enhances the mass transfer rate of dislodged random defects and improves particle removal efficiency.

By delivering megasonic energy in a highly uniform manner on a microscopic level, SAPS technology can precisely control the intensity of megasonic energy and can effectively remove random
defects of all sizes across the entire wafer in less total cleaning time than conventional megasonic cleaning products, without loss of material or roughing of wafer surfaces. We have conducted trials
demonstrating SAPS technology to be more effective than conventional megasonic and jet spray cleaning technologies as defect sizes shrink from 300nm to 20nm and below. These trials show that
SAPS technology has an even greater relative advantage over conventional jet spray technology for cleaning defects between 50 and 65nm in size, and we expect the relative benefits of SAPS will
continue to apply in cleaning even smaller defect sizes.

SAPS Applications

SAPS megasonic cleaning technology can be applied during the chip fabrication process to clean wafer surfaces and interconnects. It also can be used to clean, and lengthen the lifetime, of recycled
test wafers.

Wafer Surfaces. SAPS technology can enhance removal of random defects following planarization and deposition, which are among the most important, and most repeated, steps in the fabrication
process:

•

•

Post CMP: Chemical mechanical planarization, or CMP, uses an abrasive chemical slurry following other fabrication processes, such as deposition and etching, in order to achieve a smooth
wafer surface in preparation for subsequent processing steps. SAPS technology can be applied following each CMP process to remove residual random defects deposited or formed during
CMP.
Post Hard Mask Deposition: As part of the photolithographical patterning process, a mask is applied with each deposition of a material layer to prevent etching of material intended to be
retained.  Hard  masks  have  been  developed  to  etch  high  aspect-ratio  features  of  advanced  chips  that  traditional  masks  cannot  tolerate.  SAPS  technology  can  be  applied  following  each
deposition step involving hard masks that use nitride, oxide or carbon-based materials to achieve higher etch selectivity and resolution.

For these purposes, SAPS technology uses environmentally friendly dilute chemicals, reducing chemical consumption. Chemical types include dilute solutions of chemicals used in RCA cleaning,
such as dilute hydrofluoric acid and RCA SC-1 solutions, and, for higher quality wafer cleaning, functional de-ionized water produced by dissolving hydrogen, nitrogen or carbon dioxide in water
containing a small amount of chemicals, such as ammonia. Functional water removes random defects by generating radicals, and megasonic excitation can be used in conjunction with functional
water to further increase the generation of radicals. Functional water has a lower cost and environmental impact than RCA solutions, and using functional water is more efficient in eliminating
random defects than using dilute chemicals or de-ionized water alone. We have shown that SAPS megasonic technology using functional water exhibits high efficiency in removing random defects,
especially particles smaller than 65nm, with minimal damage to structures.

Interconnects and Barrier Metals. Each successive advanced process node has led to finer feature sizes of interconnects such as contacts, which form electrical pathways between a transistor and the
first metal layer, and vias, which form electrical pathways between two metal layers. Advanced nodes have also resulted in higher aspect ratios for interconnect

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structures, with thinner, redesigned metal barriers being used to prevent diffusion. SAPS technology can improve the removal of residues and other random defects from interconnects during the
chip fabrication process:

•

•

Post Contact/Via Etch: Wet etching processes are commonly used to create patterns of high-density contacts and vias. SAPS technology can be applied after each such etching process to
remove random defects that could otherwise lead to electrical shorts.
Pre Barrier-Metal Deposition: Copper wiring requires metal diffusion barriers at the top of via holes to prevent electrical leakage. SAPS technology can be applied prior to deposition of
barrier metal to remove residual oxidized copper, which otherwise would adhere poorly to the barrier and impair performance.

For these applications, SAPS technology uses environmentally friendly dilute chemicals such as dilute hydrofluoric acid, RCA SC-1 solution, ozonated de-ionized water and functional de-ionized
water with dissolved hydrogen. These chemical solutions take the place of piranha solution, a high-temperature mixture of sulfuric acid and hydrogen peroxide used by conventional wet wafer
cleaning processes. We have shown that SAPS technology exhibits greater efficiency in removing random defects, and lower levels of material loss, than conventional processes, and our chemical
solutions are less expensive and more environmentally conscious than piranha solution.

Recycled Test Wafers. In addition to using silicon wafers for chip production, chip manufacturers routinely process wafers through a limited portion of the front-end fabrication steps in order to
evaluate the health, performance and reliability of those steps. Manufacturers also use wafers for non-product purposes such as inline monitoring. Wafers used for purposes other than manufacturing
revenue products are known as test wafers, and it is typical for twenty to thirty percent of the wafers circulating in a fab to be test wafers. In light of the significant cost of wafers, manufacturers seek
to  re-use  a  test  wafer  for  more  than  one  test.  As  test  wafers  are  recycled,  surface  roughness  and  other  defects  progressively  impair  the  ability  of  a  wafer  to  complete  tests  accurately.  SAPS
technology can be applied to reduce random defect levels of a recycled wafer, enabling the test wafer to be reclaimed for use in additional testing processes. For these purposes, SAPS technology
includes improved fan filter units that balances intake and exhaust flows, precise temperature and concentration controls that ensure better handling of concentrated acid processes, and two-chemical
recycle capability that reduces chemical consumption.

SAPS Equipment

We offer two principal models of wet wafer cleaning equipment based on our SAPS technology, Ultra C SAPS II and Ultra C SAPS V. Each of these models is a single-wafer, serial-processing tool
that can be configured to customer specifications and, in conjunction with appropriate dilute chemicals, used to remove random defects from wafer surfaces or interconnects and barrier metals as
part of the chip front-end fabrication process or for recycling test wafers. By combining our megasonic and chemical cleaning technologies, we have designed these tools to remove random defects
with greater efficacy and efficiency than conventional wafer cleaning processes, with enhanced process flexibility and reduced quantities of chemicals. Each of our SAPS models was initially built
to meet specific requirements of a key customer.

SAPS II (released in 2011). Highlights of our SAPS II equipment include:

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•

•

•

•

•

•

compact design, with footprint of 2.65m x 4.10m x 2.85m (WxDxH), requiring limited clean room floor space;

up to 8 chambers, providing throughput of up to 225 wafers per hour;

double-sided cleaning capability, with up to 5 cleaning chemicals for process flexibility;

2-chemical recycling capability for reduced chemical consumption;

image wafer detection method for lowering wafer breakage rates; and

chemical  delivery  module  for  delivery  of  dilute  hydrofluoric  acid,  RCA  SC-1  solution,  functional  de-ionized  water  and
carbon dioxide to each of the chambers.

SAPS V (released in 2014). SAPS V includes SAPS II features with the following upgrades:

•

•

•

•

•

compact design, with footprint of 2.55m x 5.1m x 2.85m (WxDxH), requiring limited clean room floor space;

up to 12 chambers, providing throughput of up to 375 wafers per hour;

chemical supply system integrated into mainframe;

inline mixing method replaces tank auto changing, reducing process time; and

improved drying technology using hot isopropyl alcohol and de-ionized water.

TEBO Technology, Applications and Equipment

TEBO Technology

We developed TEBO technology for application in wet wafer cleaning during the fabrication of 2D and 3D wafers with fine feature sizes. TEBO technology facilitates effective cleaning even with
patterned features too small or fragile to be addressed by conventional jet spray and megasonic cleaning technologies.

TEBO technology solves the problems created by transient cavitation in conventional megasonic cleaning processes. Cavitation is the formation of bubbles in a liquid, and transient cavitation is a
process in which a bubble in fluid implodes or collapses. In conventional megasonic cleaning processes, megasonic energy forms bubbles and then causes those bubbles to implode or collapse,
blasting  destructive  high-pressure,  high-temperature  micro  jets  toward  the  wafer  surface.  Our  internal  testing  has  confirmed  that  at  any  level  of  megasonic  energy  capable  of  removing  random
defects, the sonic energy and mechanical force generated by transient cavitation are sufficiently strong to damage fragile patterned structures with features less than 70nm.

TEBO technology provides multi-parameter control of cavitation by using a sequence of rapid changes in pressure to force a bubble in liquid to oscillate at controlled sizes, shapes and temperatures,
rather than implode or collapse. As a result, cavitation remains stable during TEBO megasonic cleaning processes, and a chip fabricator can, using TEBO technology, apply the level of megasonic
energy needed to remove random defects without incurring the pattern damage created by transient cavitation in conventional megasonic cleaning.

We  have  demonstrated  the  damage-free  or  low-damage  cleaning  capabilities  of  TEBO  technology  on  customers’  patterned  wafers  as  small  as  1xnm  (16nm  to  19nm),  and  we  believe  TEBO
technology will be applicable in even smaller fabrication process nodes. TEBO technology can be applied in manufacturing processes for conventional 2D chips with fine features and advanced
chips with 3D structures, including Fin Field Effect Transistors or FinFET, DRAM, 3D NAND and 3D cross point memory, and we expect it will be applicable to other 3D architectures developed in
the  future,  such  as  carbon  nanotubes  and  quantum  devices.  As  a  result  of  the  thorough,  controlled  nature  of  TEBO  processes,  cleaning  time  for  TEBO-based  solutions  may  take  longer  than
conventional megasonic cleaning processes. Conventional processes have proven ineffective, however, for process nodes of 20nm or less, and we believe the increased yield that can be achieved by

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using TEBO technology for nodes up to 70nm can more than offset the cost of the additional time in utilizing TEBO technology.

TEBO Applications

At process nodes of 28nm and less, chip makers face escalating challenges in eliminating nanometric particles and maintaining the condition of inside pattern surfaces. In order to maintain chip
quality and avoid yield loss, cleaning technologies must control random defects of diminishing killer defect sizes, without roughing or otherwise damaging surfaces of transistors, interconnects or
other wafer features. TEBO technology can be applied in numerous steps throughout the manufacturing process flow for effective, damage-free cleaning:
•

Memory Chips: We estimate that TEBO technology can be applied in as many as 50 steps in the fabrication of a DRAM chip, consisting of up to 10 steps in cleaning ISO structures, 20 steps
in cleaning buried gates, and 20 steps in cleaning high aspect-ratio storage nodes and stacked films.

•

Logic Chips: In the fabrication process for a logic chip with a FinFET structure, we estimate that TEBO technology can be used in 15 or more cleaning steps.

For purposes of solving inside pattern surface conditions for memory or logic chips, TEBO technology uses environmentally friendly dilute chemicals such as RCA SC-1 and hydrogen gas doped
functional water.

TEBO Equipment

We offer two models of wet wafer cleaning equipment based on our TEBO technology, Ultra C TEBO II and Ultra C TEBO V. Each of these models is a single-wafer, serial-processing tool that can
be configured to customer specifications and, in conjunction with appropriate dilute chemicals, used at numerous manufacturing processing steps for effective, damage-free cleaning of chips at
process nodes of 28nm or less. TEBO equipment solves the problem of pattern damage caused by transient cavitation in conventional jet spray and megasonic cleaning processes, providing better
particle

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removal efficiency with limited material loss or roughing. TEBO equipment is being evaluated by a select group of leading memory and logic chip customers.

Each model of TEBO equipment includes:

•

•

•

•

an equipment front-end module, or EFEM, which moves wafers from chamber to chamber.

one or more chamber modules, each equipped with a TEBO megasonic generator system.

an electrical module to provide power for the tool; and

a chemical delivery module.

Ultra C TEBO II (released in 2016). Highlights of our Ultra C TEBO II equipment include:

•

•

•

•

compact design, with footprint of 2.25m x 2.25m x 2.85m (WxDxH);

up to 8 chambers with an upgraded transport system and optimized robotic scheduler, providing throughput of up to 300
wafers per hour.

EFEM module consisting of 4 load ports, transfer robot and 1 process robot; and

focus on dilute chemicals contributes to environmental sustainability and lower cost of ownership.

Ultra C TEBO V (released in 2016). Highlights of our Ultra C TEBO V equipment include:

•

•

•

•

footprint of 2.45m x 5.30m x 2.85m (WxDxH).

up to 12 chamber modules, providing throughput of up to 300 wafers per hour.

EFEM module consisting of 4 load ports, 1 transfer robot and 1 process robot: and

chemical delivery module for delivery of isopropyl alcohol, dilute hydrofluoric acid, RCA SC-1 solution, functional de-
ionized water and carbon dioxide to each of the chambers.

Tahoe Overview

Our  Ultra-C  Tahoe  wafer  cleaning  tool  can  deliver  high  cleaning  performance  using  significantly  less  sulfuric  acid  and  hydrogen  peroxide  than  is  typically  consumed  by  conventional  high-
temperature single-wafer cleaning tools. During normal single-wafer cleaning processes, only a fraction of the acid reacts with the wafer surface, while the majority is wasted as acid spins off the
wafer and requires significant cost and effort to be recycled. Tahoe employs a proprietary hybrid approach in which the sulfuric acid cleaning steps are processed in batch mode, and the final stage
cleaning are processed with single-wafer cleaning technologies. In addition to providing cost savings resulting from vastly reduced sulfuric acid consumption, Ultra-C Tahoe meets the needs of
customers who face increased environmental regulations and demand new, more environmentally friendly tools. We delivered our first Ultra C Tahoe tool to a strategic customer in 2019.

Advanced Packaging and other Back-End Processing Tools

We leverage our technology and expertise to provide a range of single-wafer tools for back-end wafer assembly and packaging factories. We develop, manufacture and sell a wide range of advanced
packaging tools, such as coaters, developers, photoresist strippers, scrubbers, wet etchers and copper-plating tools. We focus on providing custom-made, differentiated equipment that incorporates
customer-requested features at a competitive price.

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For example, our Ultra C Coater is used in applying photoresist, a light-sensitive material used in photolithography to transfer a pattern from a mask onto a wafer. Coaters typically provide input and
output elevators, shuttle systems and other devices to handle and transport wafers during the coating process. Unlike most coaters, the Ultra C Coater is fully automated. Based on requests from
customers, we developed and incorporated the special function of chamber auto-clean module into the Ultra C Coater, which further differentiates it from other products in the market by reducing or
eliminating  the  cleaning  of  shroud  in  the  coater  which  increases  the  tool’s  continuous  production  time.  The  Ultra  C  Coater  is  designed  to  deliver  improved  throughput  and  more  efficient  tool
utilization while eliminating particle generation.

Our other advanced packaging tools include: Ultra ECP ap, which delivers a uniform metal layer to finished wafers prior to packaging; Ultra C Developer, which applies liquid developer to selected
parts of photoresist to resolve an image; Ultra C PR Megasonic-Assisted Stripper, which removes photoresist; Ultra C Scrubber, which scrubs and cleans wafers; Ultra C Thin Wafer Scrubber, which
addresses a sub-market of cleaning very thin wafers for certain Asian assembly factories; and Ultra C Wet Etcher, which etches silicon wafers and copper and titanium interconnects.

Our Customers

Since 2009 we have delivered more than 765 tools to our customers, more than 650 of which were repeat orders or acceptances upon contractual performance obligations having been met and
thereby generated revenue to us. The balance of the delivered tools is subject to the customer's acceptance of the tool upon the tool's satisfaction of applicable contractual requirements or subject to
the customer's subsequent discretionary commitment to purchase the tool. To date, substantially all of our sales of equipment for semiconductor-manufacturing have been to customers located in
Asia, and we anticipate that a substantial majority of our revenue from these products will continue to come from customers located in this region for the foreseeable future. We have begun to add to
our efforts to further address customers in North America, Western Europe and Southeast Asia, by expanding our direct sales teams and increasing our global marketing activities.

Our front-end customers have included: Shanghai Huali Microelectronics Corporation, together with Huahong Semiconductor Ltd., collectively known as The Shanghai Huahong (Group) Company,
Ltd.,  or  The  Huali  Huahong  Group,  a  leading  mainland  China-based  foundry;  Semiconductor  Manufacturing  International  Corporation,  or  SMIC,  a  leading  mainland  China-based  foundry;  SK
Hynix  Inc.,  a  leading  Korean  memory  chip  company;  Yangtze  Memory  Technologies  Co.,  Ltd.,  or  YMTC,  a  leading  mainland  China-based  memory  chip  company,  together  with  one  of  its
subsidiaries; ChangXin Memory Technologies, or CXMT, a leading mainland China-based memory chip company; and SiEn, a leading mainland China-based power-semiconductor chip company.
Our wafer assembly and packaging customers have included: Jiangyin Changdian Advanced Packaging Co. Ltd., a mainland China-based wafer bumping packaging house that is a subsidiary of
JCET Group Co., Ltd.; Nantong Tongfu Microelectronics Co., Ltd., a mainland China-based chip assembly and testing company that is a subsidiary of Nantong Fujitsu Microelectronics Co., Ltd.;
Nepes Co., Ltd., a semiconductor packaging company based in Korea; and Wafer Works Corporation, a mainland China-based wafer supplier.

In 2023, 45.5% of our revenue was derived from three customers: SMIC accounted for 16.7% of our revenue; SiEn accounted for 15.4% of our revenue; and CXMT; accounted for 13.4% of our
revenue. In 2022, 43.8% of our revenue was derived from three customers: The Huali Huahong Group; accounted for 18.2% of our revenue; SMIC accounted for 15.6% of our revenue, and YMTC
accounted for 10.0% of our revenue. In 2021, 48.9% of our revenue was derived from two customers: The Huali Huahong Group accounted for 28.1% of our revenue; and YMTC accounted for
20.8% of our revenue.

Sales and Marketing

We  market  and  sell  our  products  worldwide  using  a  combination  of  our  direct  sales  force  and  third-party  representatives.  We  employ  direct  sales  teams  in  mainland  China,  the  United  States,
Southeast Asia, and Europe. We also employ field application engineers, who are typically co-located with our direct sales teams, to provide technical pre- and post-sale support and other assistance
to existing and potential customers throughout the customers’ fab planning and production line qualification and fab expansion phases. Our field application engineers are organized by end markets
as well as core competencies in hardware, control system, software and process development to support our customers.

To supplement our direct sales teams, we have contacts with several independent sales representatives in mainland China, Korea and Taiwan. We select these independent representatives based on
their ability to provide effective field sales, marketing forecast and technical requirement updates for our products. In the case of representatives, our customers place purchase orders with us directly
rather than with the representatives.

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Our sales have historically been made using purchase orders with agreed technical specifications. Our sales terms and conditions are generally consistent with industry practice but may vary from
customer to customer. We seek to obtain a purchase order two to six months ahead of the customer’s desired delivery date. Consistent with industry practice, we allow customers to reschedule or
cancel orders at a certain cost to them on relatively short notice. Because of our relatively short delivery period and our practice of permitting rescheduling or cancellation, we believe that backlog is
not a reliable indicator of our future revenue.

Our  marketing  team  focuses  on  our  product  strategy  and  technology  road  maps,  product  marketing,  new  product  introduction  processes,  demand  assessment  and  competitive  analysis,  customer
requirement communication and public relations. Our marketing team also has the responsibility to conduct environmental scans, study industry trends and arrange our participation at major trade
shows.

Manufacturing

We conduct a substantial majority of our product development, manufacturing, support and services in mainland China, with additional product development and subsystem production in Korea.
Substantially all of our tools are built to order at our manufacturing facilities in the Pudong region of Shanghai, which now encompass a total of 236,000 square feet of floor space for production
capacity.

In May 2020 ACM Shanghai, through its wholly owned subsidiary ACM Shengwei, entered into an agreement for a land use right in the Lingang region of Shanghai. In July 2020 ACM Shengwei
began  a  multi-year  construction  project  for  a  new  development  and  production  center.  The  planned  1,000,000  square  foot  facility  will  incorporate  state-of-the-art  manufacturing  systems  and
automation technologies and will provide the floor space to support significantly more production capacity and related research and development activities when fully staffed and supplied. See
“Item 2. Properties,” of Part I of this report.

Our experience has shown that chip manufacturers in mainland China and throughout Asia demand equipment meeting their specific technical requirements and prefer building relationships with
local suppliers. We will continue to seek to leverage our local presence to address the growing market for semiconductor manufacturing equipment in the region by working closely with regional
chip manufacturers to understand their specific requirements, encourage them to adopt our SAPS, TEBO, Tahoe, ECP, furnace, Track, PECVD, and other technologies in our current portfolio, and
enable us to design innovative products and solutions to address their needs.

We purchase some of the components and assemblies that we include in our products from single source suppliers. We believe that we could obtain and qualify alternative sources to supply these
components. Nevertheless, any prolonged inability to obtain these components could have an adverse effect on our operating results and could unfavorably impact our customer relationships. Please
see  “Item  1A.  Risk  Factors—Risks  Related  to  Our  Business  and  Our  Industry—We  depend  on  a  limited  number  of  suppliers,  including  single  source  suppliers,  for  critical  components  and
assemblies, and our business could be disrupted if they are unable to meet our needs.”

Research and Development

We believe that our success depends in part on our ability to develop and deliver breakthrough technologies and capabilities to meet our customers’ ever-more challenging technical requirements.
For this reason, we devote significant financial and personnel resources to research and development. Our research and development team is comprised of highly skilled engineers and technologists
with extensive experience in megasonic technology, cleaning processes and chemistry, mechanical design, and control system design.

For the foreseeable future we are focusing on enhancing our Ultra C SAPS, TEBO, Tahoe, ECP, furnace and other tools and integrating additional capabilities to meet and anticipate requirements
from our existing and potential customers. Our particular areas of focus include development of the following:
•
•
•
•

new cleaning steps for Ultra C SAPS cleaners for application in logic chips and for DRAM, and 3D NAND technologies.
new cleaning steps for Ultra C TEBO cleaners for FinFET in logic chips, gates in DRAM, and deep vias in 3D NAND technologies.
new cleaning steps for Ultra Tahoe cleaners for application in logic chips and for DRAM and 3D NAND technologies.
new dry technologies such as supercritical CO2 dry and advanced IPA dry for DRAM, and logic technologies.

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•
•
•

new hardware, including new system platforms, new and additional chamber structures and new chemical blending systems;
new software to integrate new functionalities to improve tool performance; and
support for the ongoing evaluations and commercialization efforts and product extensions for the newly introduced PECVD and Track product categories.

Longer term, we are working on new proprietary process capabilities based on our existing tool hardware platforms. We are also working to integrate our tools with third-party tools in adjacent
process areas in the chip manufacturing flow.

Our research and development expense totaled $92.7 million or 16.6% of revenue in 2023, $62.2 million or 16.0% of revenue in 2022, and $34.2 million or 13.2% of revenue in 2021. We intend to
continue  to  invest  in  research  and  development  to  support  and  enhance  our  existing  cleaning  products  and  to  develop  future  product  offerings  to  build  and  maintain  our  technology  leadership
position.

Intellectual Property

Our  success  and  future  revenue  growth  depend,  in  part,  on  our  ability  to  protect  our  intellectual  property.  We  control  access  to  and  use  of  our  proprietary  technologies,  software  and  other
confidential  information  through  the  use  of  internal  and  external  controls,  including  contractual  protections  with  employees,  consultants,  advisors,  customers,  partners  and  suppliers.  We  rely
primarily  on  patent,  copyright,  trademark  and  trade  secret  laws,  as  well  as  confidentiality  procedures,  to  protect  our  proprietary  technologies  and  processes.  All  employees  and  consultants  are
required to execute confidentiality agreements in connection with their employment and consulting relationships with us. We also require them to agree to disclose and assign to us all inventions
conceived or made in connection with the employment or consulting relationship.

We have aggressively pursued intellectual property since our founding in 1998. We focus our patent filing efforts in the United States, and, when justified by cost and strategic importance, we file
corresponding foreign patent applications in strategic jurisdictions such as the European Union, mainland China, Japan, Singapore, Korea, and Taiwan. Our patent strategy is designed to provide a
balance between the need for coverage in our strategic markets and the need to maintain costs at a reasonable level.

As  of  December  31,  2023,  we  had  64  issued  patents,  and  29  patents  pending,  in  the  United  States.  These  patents  carry  expiration  dates  from  2027  through  2038.  Many  of  the  US  patents  and
applications  have  also  been  filed  internationally,  including  one  or  more  of  the  European  Union,  Japan,  mainland  China,  Singapore,  Korea,  and  Taiwan.  Specifically,  we  own  patents  in  wafer
cleaning, electro-polishing and plating, wafer preparation, and other semiconductor processing technologies. We have been issued more than 498 patents in the United States, mainland China, Japan,
Korea, Singapore and Taiwan.

We manufacture advanced single-wafer cleaning systems equipped with our SAPS, TEBO and Tahoe technologies. We have 57 patents granted internationally protecting our SAPS technologies, and
we have filed 11 international patent applications for key TEBO technologies, and 5 for Tahoe, in accordance with the Patent Cooperation Treaty. In addition we have patented technologies for SFP
and ECP that are embedded in certain tools. We also have patented technologies in other semiconductor processing areas, including wafer preparation and several specific processing steps.

To date we have not granted licenses to third parties under the patents described above. Not all of these patents have been implemented in products. We may enter into licensing or cross-licensing
arrangements with other companies in the future.

We cannot assure you that any patents will issue from any of our pending applications. Any rights granted under any of our existing or future patents may not provide meaningful protection or any
commercial  advantage  to  us.  With  respect  to  our  other  proprietary  rights,  it  may  be  possible  for  third  parties  to  copy  or  otherwise  obtain  and  use  our  proprietary  technology  or  marks  without
authorization or to develop similar technology independently.

The  semiconductor  equipment  industry  is  characterized  by  vigorous  protection  and  pursuit  of  intellectual  property  rights  or  positions,  which  have  resulted  in  often  protracted  and  expensive
litigation. We may in the future initiate claims or litigation against third parties to determine the validity and scope of proprietary rights of others. In addition, we may in the future initiate litigation
to enforce our intellectual property rights or the rights of our customers or to protect our trade secrets.

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Our customers could become the target of litigation relating to the patent or other intellectual property rights of others. This could trigger technical support and indemnification obligations in some
of our customer agreements. These obligations could result in substantial expenses, including the payment by us of costs and damages related to claims of patent infringement. In addition to the time
and expense required for us to provide support or indemnification to our customers, any such litigation could disrupt the businesses of our customers, which in turn could hurt our relations with our
customers  and  cause  the  sale  of  our  products  to  decrease.  We  do  not  have  any  insurance  coverage  for  intellectual  property  infringement  claims  for  which  we  may  be  obligated  to  provide
indemnification.

Additional information about the risks relating to our intellectual property is provided under “Item 1A. Risk Factors—Risks Related to Our Intellectual Property and Data Security.”

Competition

The chip equipment industry is characterized by rapid change and is highly competitive throughout the world. We compete with semiconductor equipment companies located around the world, and
we may also face competition from new and emerging companies, including new competitors from mainland China. We consider our principal competitors to be those companies that provide wafer
cleaning  and  electrical  plating  products  to  the  market,  including  Lam  Research  Corporation,  NAURA  Technology  Group  Co.,  Ltd.,  Mujin  Electronics  Co.,  Ltd.,  SCREEN  SPE  USA,  LLC  (a
subsidiary of SCREEN Holdings Co., Ltd.), SEMES Co. Ltd., Tokyo Electron Ltd. and Kokusai Semiconductor Equipment Corporation. Key competitors for our newly-introduced PECVD and
Track products include Lam Research Corporation, Applied Materials, Inc., KINGSEMI Co., Ltd. and Suzhou Jingtuo Semiconductor Technology Co., Ltd.

Compared to our company, our current and potential competitors may have:
•
•

better established credibility and market reputations, longer operating histories, and broader product offerings;
significantly  greater  financial,  technical,  marketing  and  other  resources,  which  may  allow  them  to  pursue  design,  development,  manufacturing,  sales,  marketing,  distribution  and  service
support of their products;
more extensive customer and partner relationships, which may position them to identify and respond more successfully to market developments and changes in customer demands;
multiple product offerings, which may enable them to offer bundled discounts for customers purchasing multiple products or other incentives that we cannot match or offer.

The principal competitive factors in our market include:
•

performance of products, including particle removal efficiency, rate of damage to wafer structures, high temperature chemistry, throughput, tool uptime and reliability, safety, chemical waste
treatment, and environmental impact;
gap filling capability, the deposited film thickness uniformity within wafer and wafer to wafer, particle generated on the wafer during the processes;
service support capability and spare parts delivery time; innovation and development of functionality and features that are must-haves for advanced fabrication nodes;
ability to anticipate customer requirements, especially for advanced process nodes of less than 45nm; ability to identify new process applications;
brand recognition and reputation; and
skill and capability of personnel, including design engineers, manufacturing engineers and technicians, application engineers, and service engineers.

•
•

•
•
•
•
•

In addition, semiconductor manufacturers must make a substantial investment to qualify and integrate new equipment into semiconductor production lines. Some manufacturers began fabricating
chips  for  the  5nm  node  in  2020  and  the  3nm  node  in  2022.  Once  a  semiconductor  manufacturer  has  selected  a  particular  supplier’s  equipment  and  qualified  it  for  production,  the  manufacturer
generally  maintains  that  selection  for  that  specific  production  application  and  technology  node  as  long  as  the  supplier’s  products  demonstrate  performance  to  specification  in  the  installed  base.
Accordingly, we may experience difficulty in selling to a given manufacturer if that manufacturer has qualified a competitor’s equipment. If, however, that cleaning equipment constrains chip yield,
we expect, based on our experience to date, that the manufacturer will evaluate implementing new equipment that cleans more effectively.

Our People

As of December 31, 2023, we had 1,590 full-time equivalent employees, of whom 139 were in administration, 286 were in manufacturing, 733 were in research and development, and 432 were in
sales and marketing and customer services. Of these employees, 1,416 were located in mainland China and the Taiwan region, 159 were located in Korea and 15 were

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based in the United States. We have never had a work stoppage, and none of our employees are represented by a labor organization or subject to any collective bargaining arrangements. We consider
our employee relations to be good.

We compete in the highly competitive semiconductor equipment industry, with operations principally in mainland China. Attracting, developing, and retaining skilled and experienced employees in
research and development, manufacturing, sales and marketing, and other positions is crucial to our ability to compete effectively. Our ability to recruit and retain such employees depends on a
number  of  factors,  including  our  corporate  culture  and  work  environment,  informed  by  our  values  and  behaviors,  our  corporate  philosophy  of  talent  development  and  career  opportunities,  and
compensation and benefits.

To attract and retain qualified employees and key talent, we offer total compensation packages that are competitive with comparable companies, particularly in mainland China and, specifically,
Shanghai.

We provide training and development programs to our employees, and we have trained many of our key engineers and managers for more than a decade. Retention of these key employees is critical
to secure our future growth and technology development. To assist in employee retention and recruitment, we offer employee housing in the Lingang region of Shanghai nearby our new research
and development and production center.

Environmental

Severe  weather  events,  including  earthquakes,  fires,  floods,  heat  waves,  hurricanes  and  other  environmental  disasters,  could  pose  a  threat  to  our  manufacturing  and  research  and  development
activities through physical damage to our operating facilities or equipment or disruption of power supply or telecommunications infrastructure. The frequency and intensity of severe weather events
are reportedly increasing throughout the world as part of broader climate changes. Global weather pattern changes may also pose long-term risks of physical impacts to our business. We maintain
disaster recovery and business continuity plans that would be implemented to help us recover in the event of severe weather events that interrupt our business. See “Item 1A. Risk Factors—General
—Our production facilities could be damaged or disrupted by a natural disaster, war, terrorist attacks or other catastrophic events.”

Concerns about climate change have resulted in various laws and regulations that are intended to limit carbon emissions and address other environmental concerns. In recent years, mainland China,
where our production facilities are located, has undertaken comprehensive sustainability initiatives that are requiring companies to meet new environmental standards and deal with higher energy
and other production costs. Environmental laws and regulations may impose new or unexpected cost either directly through, for example, higher energy costs or indirectly through increased costs of
compliance  or  of  failing  to  comply  with  these  laws  and  regulations.  These  laws  and  regulations  might  increase  the  cost  of  construction,  maintenance  and  operation  of  our  new  research  and
development center and factory in the Lingang region of Shanghai.

We do not currently expect that existing or pending climate change laws and regulations will be material to our results of operations in the foreseeable future. Climate change could, however, have a
direct effect on our customer base of semiconductor fabricators, whose operations typically require copious quantities of power and water and a number of chemicals. Chip fabrication operations
often result in significant amounts of wastewater, which can contain a number of harmful contaminants, including antimony, arsenic, hydrofluoric acid and hydrogen peroxide, that historically have
resulted in groundwater pollution and related violations of environmental laws. Moreover, water and chemical demands for semiconductor fabrication are expected to increase with the production of
more advanced chips at smaller process nodes. As a result, some leading chip fabricators have begun to invest in conservation and treatment technologies for water and chemicals.

We have designed some of our tools to require significantly reduced levels of environmentally harmful chemicals, which helps customers face increased environmental laws and regulations. SAPS
and  TEBO  technologies  use  environmentally  friendly  dilute  chemicals,  such  as  dilute  hydrofluoric  acid,  RCA  SC-1  solution,  ozonated  de-ionized  water  and  functional  de-ionized  water  with
dissolved hydrogen. In interconnect and barrier metals applications based on SAPS technology, for example, these chemical solutions take the place of chemicals such as piranha solution, a high-
temperature mixture of sulfuric acid and hydrogen peroxide used by conventional wet wafer cleaning processes. Similarly, Tahoe technology delivers high cleaning performance using significantly
less sulfuric acid and hydrogen peroxide than is typically consumed by conventional high-temperature single-wafer cleaning tools. For additional information, see “—Our Technology and Product
Offerings—Wet Cleaning Equipment for Front End Production Processes.”

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Available Information

We are required to file annual, quarterly and current reports, proxy statements and other information with the U.S. Securities and Exchange Commission, or the SEC. The SEC maintains a website at
www.sec.gov that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

Our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K, proxy statements and amendments to those documents filed or furnished pursuant to Section
13(a) or 15(d) of the Securities Exchange Act of 1934, or the Exchange Act, are also available free of charge on our website at www.acmrcsh.com as soon as reasonably practicable after such reports
are electronically filed with or furnished to the SEC.

Investors  should  note  that  we  announce  material  information  to  our  investors  and  others  using  filings  with  the  SEC,  press  releases,  public  conference  calls,  webcasts  or  our  website
(www.acmrcsh.com),  including  news  and  announcements  regarding  our  financial  performance,  key  personnel,  our  brands  and  our  business  strategy.  Information  that  we  post  on  our  corporate
website could be deemed material to investors. We encourage investors to review the information we post on these channels. We may from time to time update the list of channels we will use to
communicate information that could be deemed material and will post information about any such change on www.acmrcsh.com. The information on our website is not, and shall not be deemed to
be, a part hereof or incorporated into this or any of our other filings with the SEC.

Item 1A.    Risk Factors

Investing in Class A common stock involves a high degree of risk. You should consider and read carefully all of the risks and uncertainties described below, as well as other information contained in
this  report,  including  the  consolidated  financial  statements  and  related  notes  set  forth  in  “Item  8.  Financial  Statements  and  Supplementary  Data”,  before  making  an  investment  decision.  The
occurrence  of  any  of  the  following  risks  or  additional  risks  and  uncertainties  not  presently  known  to  us  or  that  we  currently  believe  to  be  immaterial  could  materially  and  adversely  affect  our
business, financial condition, results of operations or cash flows. In any such case, the trading price of Class A common stock could decline, and you may lose all or part of your investment. This
report also contains forward-looking statements and estimates that involve risks and uncertainties. Our actual results could differ materially from those anticipated in the forward-looking statements
as a result of specific factors, including the risks and uncertainties described below.

RISK FACTOR SUMMARY

Our  business  is  subject  to  a  number  of  risks,  including  risks  that  may  prevent  us  from  achieving  our  business  objectives  or  may  adversely  affect  our  business,  financial  condition,  results  of
operations, cash flows and prospects. The risks are discussed more fully below and include, but are not limited to, the risks summarized below.

Risks Related to International Aspects of Our Business

•

if any mainland China central government authority were to determine that existing mainland China laws or regulations require that ACM Shanghai obtain the authority’s permission or
approval to continue the listing of ACM Research’s Class A common stock in the United States or if those existing mainland China laws and regulations, or interpretations thereof, were to
change  to  require  such  permission  or  approval,  or  if  we  inadvertently  conclude  that  permissions  or  approvals  are  not  required,  ACM  Shanghai  may  be  unable  to  obtain  the  required
permission  or  approval  or  may  only  be  able  to  obtain  such  permission  or  approval  on  terms  and  conditions  that  impose  material  new  restrictions  and  limitations  on  operation  of  ACM
Shanghai, either of which could have a material adverse effect on our business, financial condition, results of operations, reputation and prospects and on the trading price of ACM Research
Class A common stock, which could decline in value or become worthless;

• mainland China central government authorities may intervene in, or influence, ACM Shanghai’s mainland China-based operations at any time, and those authorities’ rules and regulations in

•

•

mainland China can change quickly with little or no advance notice;
the mainland China central government may determine to exert additional control over offerings conducted overseas or foreign investment in mainland China-based issuers, which could
result in a material change in operations of ACM Shanghai and cause significant declines in the value of ACM Research Class A common stock, or make them worthless;
if  we  are  unable  to  comply  with  recent  and  proposed  legislation  and  regulations  regarding  improved  access  to  audit  and  other  information  and  audit  inspections  of  accounting  firms,
including registered public accounting firms, such as our prior and current audit firms, operating in mainland China, we could be adversely affected;

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•
•

it may be difficult for overseas regulators to conduct investigations or collect evidence within mainland China;
substantially all of our assets are located outside of the United States and certain of our directors and officers reside outside of the United States, which may make it difficult for you to
enforce your rights based on the U.S. federal securities laws;

Risks Related to Our Business and Our Industry

•
•
•
•
•
•
•
•
•
•
•
•
•
•

our potential future needs for additional capital that may not be available at all or on terms acceptable to us;
the cyclicality in the semiconductor industry that may lead to substantial variations in demand for our products;
our dependence on a small number of customers for a substantial portion of our revenue;
industry manufacturers of chips adopting our SAPS, TEBO, Tahoe, ECP, furnace and other technologies;
our SAPS, TEBO, Tahoe, ECP, furnace and other technologies not achieving widespread market acceptance;
our ability to continue to enhance our existing single-wafer wet cleaning tools and identifying and entering new product markets;
our ability to establish and maintain a reputation for credibility and product quality;
our ability to expand our customer base;
our long and unpredictable sales cycle, including our incurrence of significant expenses long before we can recognize revenue from new products, if at all;
difficulties in forecasting demand for our tools;
our reliance on third parties to manufacture significant portions of our tools and our ability to manage our relationships with these parties;
any shortage of components or subassemblies, which could result in delayed delivery of products to us or in increased costs to us;
our dependence on a limited number of suppliers, including single source suppliers, for critical components and subassemblies;
our dependence on our Chief Executive Officer and President and other senior management and key employees;

Regulatory Risks

•

regulatory actions limiting our ability and the broader industry's ability to export into China, as well as other specified countries, items sourced from the U.S. or otherwise subject to control
under the U.S. Export Administration Regulations (EAR), or controls introduced by other countries including Japan and the Netherlands, thereby impacting our ability to sell our tools to
customers in these jurisdictions;
changes in government trade policies that could limit the demand for our tools and increase the cost of our tools;
changes in political and economic policies with respect to mainland China;

•
•
• mainland China’s currency exchange control and government restrictions on investment repatriation may impact our ability to transfer funds outside of mainland China;

Risks Related to Our STAR Listing

•
•
•
•

our ability to implement our strategy to expand our mainland China operations;
our ability to achieve the results contemplated by our business strategy and our strategy for growth in mainland China and expectations related to the STAR Listing;
the effect of ACM Shanghai’s status as a publicly traded company that is controlled, but less than wholly owned, by ACM Research;
our ability to manage potentially inconsistent accounting and disclosure requirements of ACM Research and ACM Shanghai as a result of the STAR Listing;

Risks Related to Our Intellectual Property and Data Security

•
•

our ability to protect our intellectual property, including in mainland China;
breaches of our cybersecurity systems;

Risks Related to Ownership of Class A Common Stock

the volatility in the market price of Class A common stock;

•
• manipulative short sellers of our stock, which may drive down the market price of our Class A common stock and could result in litigation;
•
•
•

the difficulty to predict the effect of the STAR Listing and STAR IPO on the Class A common stock;
the dual class structure of common stock, which has the effect of concentrating voting control with our executive officers and directors; and
the limited experience of our management team managing a public company.

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Risks Related to International Aspects of Our Business

If  any  mainland  China  central  government  authority  were  to  determine  that  existing  mainland  China  laws  or  regulations  require  that  ACM  Shanghai  obtain  the  authority’s  permission  or
approval to continue the listing of ACM Research’s Class A common stock in the United States or if those existing mainland China laws and regulations, or interpretations thereof, were to
change to require such permission or approval, or if we inadvertently conclude that permissions or approvals are not required, ACM Shanghai may be unable to obtain the required permission
or approval or may only be able to obtain such permission or approval on terms and conditions that impose material new restrictions and limitations on operation of ACM Shanghai, either of
which could have a material adverse effect on our business, financial condition, results of operations, reputation and prospects and on the trading price of ACM Research Class A common
stock, which could decline in value or become worthless.

Mainland  China  central  government  authorities  have  taken  steps  to  preclude,  or  significantly  discourage,  certain  mainland  China  companies  from  listing  on  U.S.  and  other  exchanges  outside
mainland China. Investments activities in mainland China by non-mainland China investors are principally governed by the Encouraged Industries Catalog for Foreign Investment (2020 version)
and the Special Administrative Measures for Foreign Investment Access (Negative List 2021), both of which were promulgated by mainland China’s Ministry of Commerce, or MOFCOM, and
National Development and Reform Commission. These regulations set forth the industries in which foreign investments are encouraged, restricted and prohibited.

Industries that are not listed in any of these three categories are generally open to foreign investment unless otherwise specifically restricted by other mainland China rules and regulations. We
believe that our operations do not fall within any industry that is restricted or prohibited under these regulations and that the regulations therefore do not apply to us.

Mainland China-based companies that seek to list their shares in the United States but are subject to mainland China restrictions on investments by non-mainland China investors sometimes use a
special purpose vehicle known as a VIE created in an off-shore jurisdiction such as the Cayman Islands. In these structures, a VIE enters into a series of contractual arrangements with mainland
China-based operating company and its mainland China-based shareholders that afford those shareholders, rather than the shareholders of the VIE, effective control over the finances and operations
of the operating company. The VIE, effectively a shell company, issues share that are listed for trading on a U.S. exchange, but the enterprise is controlled by the legacy mainland China-based
shareholders and is subject to mainland China laws and regulations. ACM Research is not a VIE or other special purpose, or shell, company, and its relationship with ACM Shanghai does not
involve the types of contractual arrangements existing between a VIE and a mainland China-based operating company. ACM Research is a Delaware corporation founded in California in 1998 that
formed ACM Shanghai to conduct business operations in mainland China. ACM Research controls the operations of ACM Shanghai through its direct ownership of ACM Shanghai shares, and it
also conducts sales and marketing activities focused on sales of ACM Shanghai products in North America, Europe and certain regions in Asia outside mainland China.

We do not believe that our corporate structure or any other matters relating to our business operations currently require that ACM Shanghai obtain any permissions or approvals from the China
Securities Regulatory Commission, or CSRC, or any other mainland China central government authority in connection with ACM’s listing, or offering for sale in the future, shares of our Class A
common stock in the United States. We, including ACM Shanghai, therefore have never solicited any permission or approval from any mainland China central government authority, and thus no
such permissions or approvals have been received or denied, in connection with ACM Research’s seeking and maintaining the listing of our Class A common stock in the United States. In the event
that we inadvertently conclude that permissions or approvals are not required, or either the CSRC or another mainland China central government authority were to determine that existing mainland
China laws or regulations require that ACM Shanghai obtain the authority’s permission or approval to continue ACM Research’s listing of Class A common stock in the United States or if those
existing mainland China laws and regulations, or interpretations thereof, were to change to require such permission or approval, ACM Shanghai could be unable to obtain any such permission or
approval or could be able to obtain such permission or approval only on terms and conditions that impose material new operating or other restrictions and limitations on ACM Shanghai. In such
circumstances, it would materially and adversely affect the value of our Class A common stock, which may decline in value or become worthless. In addition, ACM Shanghai could face sanctions
by the CSRC or other mainland China central government authorities or pressure from the mainland China government in various business matters for failure to obtain such permission or approval.
Such  potential  sanctions  or  pressure  may  include  fines  and  penalties  on  ACM  Shanghai’s  operations  in  mainland  China,  limitations  on  its  operating  privileges  in  mainland  China,  delays  in  or
restrictions on the transfer of proceeds from a public offering of ACM Research securities in the United States to ACM Shanghai, restrictions on or prohibition of the payments or remittance of
dividends by ACM Shanghai to ACM Research, or other actions that

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could have a material and adverse effect on our business, financial condition, results of operations, reputation and prospects, as well as the trading price of ACM Research Class A common stock,
which could decline in value or become worthless.

Mainland China central government authorities may intervene in, or influence, ACM Shanghai’s mainland China-based operations at any time, and those authorities’ rules and regulations in
mainland China can change quickly with little or no advance notice.

The  business  of  ACM  Shanghai  is  subject  to  complex  laws  and  regulations  in  mainland  China  that  can  change  quickly  with  little  or  no  advance  notice.  To  date,  beyond  the  COVID-19-related
restrictions in 2022, we have not experienced such intervention or influence by mainland China central government authorities or a change in those authorities’ rules and regulations that have had a
material  impact  of  ACM  Shanghai  or  ACM  Research.  We  cannot  assure  you,  however,  that  future  changes  in  mainland  China  laws  and  regulations  will  not  materially  and  adversely  affect  our
mainland China-based operations. For example:

•

•

•

•

Intellectual Property. Our commercial success depends in part on our ability to obtain and maintain patent and trade secret protection for our intellectual property, including our SAPS,
TEBO,  Tahoe,  ECP,  furnace  and  other  technologies  and  the  design  of  our  Ultra  C  equipment.  See  “—Risks  Related  to  Our  Intellectual  Property  and  Data  Security—Our  success
depends on our ability to protect our intellectual property, including our SAPS, TEBO, Tahoe, ECP, furnace and other technologies.” in Item 1A, “Risk Factors” of Part I of this report.
The significant majority of our intellectual property has been developed in mainland China and is owned by ACM Shanghai. Implementation and enforcement of intellectual property-
related  laws  in  mainland  China  have  historically  been  lacking  due  primarily  to  ambiguities  in  mainland  China  intellectual  property  law.  See  “—Risks  Related  to  Our  Intellectual
Property and Data Security—We may not be able to protect our intellectual property rights throughout the world, including mainland China, which could materially, negatively affect
our business” in Item 1A, “Risk Factors” of Part I of this report. In the event mainland China central government authorities were to significantly revise or revamp the current scope
and  structure  of  intellectual  property  protection  in  mainland  China,  our  ability  to  protect  and  enforce  our  intellectual  property  rights  for  our  key  proprietary  technologies  may  be
adversely impacted and competitors may be able to match our technologies and tools in order to compete with us.

Title Defect in Leased Premises. We conduct research and development, and service support operations at ACM Shanghai’s headquarters located in the Zhangjiang Hi Tech Park in
Shanghai, which ACM Shanghai leases from Zhangjiang Group. Zhangjiang Group has not obtained a certificate of property title for the premises, although it has represented to ACM
Shanghai that it has the right to rent the premises to ACM Shanghai. If any adjustment in local regional overall planning of Shanghai, or any other reason, results in the demolition of
such  premises,  the  premises  could  not  continue  to  be  leased  to  ACM  Shanghai  and  the  day-to-day  production  and  operation  of  ACM  Shanghai  would  be  materially  and  adversely
affected. See Item 2, “Properties” of Part I of this report.

COVID-19 Pandemic. We conduct substantially all of our product development, manufacturing, support and services in mainland China, and those activities were directly impacted by
COVID-19 and related restrictions on transportation and public appearances, including implementation by mainland China government authorities of “spot” and full-city quarantines in
the  city  of  Shanghai,  where  substantially  all  of  our  operations  are  located.  Furthermore,  a  number  of  our  key  customers  have  substantial  operations  based  in  operations  areas  of
mainland China, including in the City of Shanghai, which required us to defer, in the first quarter of 2022, shipments of finished products to those customers. A significant number of
ACM Shanghai employees missed work in late 2022 and early 2023 for one or several weeks due to COVID-19 related illness following the relaxation of mainland China’s zero-
COVID policies in December 2022.

Data Security.  The  Standing  Committee  of  the  National  People’s  Congress,  or  the  Standing  Committee,  has  promulgated  the  Cyber  Security  Law,  which  imposes  requirements  on
entities who build and operate mainland China’s internet architecture or provide services in mainland China over the internet, and the Data Security Law, which imposes data security
and privacy obligations on entities and individuals carrying out data activities. The Data Security Law also provides for a national security review procedure for data activities that may
affect national security and imposes export restrictions on certain data an information. ACM Shanghai is not subject to the existing restrictions imposed by the Cyber Security Law or
the Data Security Law, in part because its business operations do not involve the collection, processing or use of data

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or information involving personal privacy or private information of customers. In addition, ACM Shanghai is subject to oversight by the Cyberspace Administration of China, or the
CAC, regarding data security. ACM Shanghai does not collect or maintain personal information except for routine personal information necessary to process payroll payments and
other benefits and emergency contact information, and as a result, ACM Shanghai is not currently subject to significant restrictions or limitations in addressing and managing data
security issues and complying with CAC regulations. To date, ACM Shanghai has not been involved in any investigations on cybersecurity review initiated by the CAC or any related
mainland  China  central  government  authority  and  has  not  received  any  inquiry,  notice,  warning,  or  sanction  in  such  respect.  However,  cybersecurity  is  increasingly  a  focus  of  the
mainland China central government. If the CAC or other mainland China central government authorities should in the future require ACM Shanghai to comply with these or additional,
or more restrictive, mainland China cybersecurity regulations, it could require ACM Shanghai to make changes to its operations, and any failure to satisfy or delay in meeting such
requirements may subject ACM Shanghai to restrictions and penalties imposed by the CAC or other mainland China regulatory authorities, which may include regulatory actions, fines
and penalties on our operations in mainland China, which could materially harm our business, financial condition, results of operations, reputation and prospects.

•

•

•

Anti-Monopoly. A number of mainland China laws and regulations have established procedures and requirements that could make merger and acquisition activities in China by foreign
investors more time consuming and complex. These laws and regulations, which include the Anti-Monopoly Law and the Rules of the Ministry of Commerce on Implementation of
Security Review System of Mergers and Acquisitions of Domestic Enterprises by Foreign Investors, impose requirements that in some instances that MOFCOM be notified in advance
of, for example, any change-of-control transaction in which a foreign investor takes control of a mainland China domestic enterprise. In addition, such Rules specify that mergers and
acquisitions by foreign investors that raise “national defense and security” concerns and mergers and acquisitions through which foreign investors may acquire de facto control over
domestic enterprises that raise “national security” concerns are subject to strict review by MOFCOM. In February 2021, the Anti-Monopoly Committee of the State Council published
the Anti-Monopoly Guidelines for the Internet Platform Economy Sector, which stipulate that any concentration of undertakings involving VIEs is subject to anti-monopoly review.
Those Guidelines provide more stringent rules for Internet platform operators, including regulations on the use of data and algorithms, technology and platform to commit abusive acts.
The Measures for the Security Review for Foreign Investment, which was promulgated jointly by National Development and Reform Commission and MOFCOM effective January 18,
2021, and the Standing Committee on Amending the Anti-Monopoly Law of the People’s Republic of China, which was promulgated by the Standing Committee effective August 1,
2022, delineated provisions concerning the security review procedures on foreign investment, including the types of investments subject to review and the scopes and procedures of the
review.  ACM  Shanghai  does  not  have  the  concentration  of  business  operators  stipulated  in  the  Anti-Monopoly  Law,  and  our  operations  and  activities  to  date  have  not  otherwise
subjected us to restrictive provisions or limitations set forth in applicable mainland China laws and regulations govern merger and acquisition activities. Among other things, ACM
Shanghai’s business operations do not constitute identified “national defense and security” concerns associated with the arms industry, any industry ancillary to the arms industry, or
any other field related to national defense security. We cannot assure you, however, that future changes in mainland China laws and regulations governing mergers and acquisitions,
including activities in mainland China by foreign investors, will not extend or otherwise modify existing requirements, which could materially and adversely affect our mainland China-
based operations or our ability to expand by investments or acquisitions.

Permits. In the ordinary course of business, ACM Shanghai has obtained all of the permits and licenses it believes are necessary for it to operate in mainland China. ACM Shanghai
may  be  adversely  affected,  however,  by  the  complexity,  uncertainties  and  changes  in  mainland  China  laws  and  regulations  applicable  to,  or  otherwise  affecting,  the  semiconductor
equipment industry and related businesses, and any lack of requisite approvals, licenses or permits applicable to ACM Shanghai’s business may have a material adverse effect on its
business and results of operations.

Trade Policies. Since 2018, general trade tensions between the United States and mainland China have escalated. See “—Regulatory Risks—Changes in government trade policies
could limit the demand for our tools and increase the cost of our tools” in Item 1A, “Risk Factors” of Part I of this report. The imposition of tariffs by the U.S. and mainland China
governments and the surrounding economic uncertainty may negatively impact the semiconductor industry, including by reducing the demand of fabricators for capital

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equipment such as our tools. Further changes in trade policy, tariffs, additional taxes, restrictions on exports or other trade barriers, or restrictions on supplies, equipment, and raw
materials  including  rare  earth  minerals,  may  limit  the  ability  of  our  customers  to  manufacture  or  sell  semiconductors  or  to  make  the  manufacture  or  sale  of  semiconductors  more
expensive and less profitable, which could lead those customers to fabricate fewer semiconductors and to invest less in capital equipment such as our tools. In addition, if mainland
China were to impose additional tariffs on raw materials, subsystems or other supplies that we source from the United States, our cost for those supplies would increase. As a result of
any of the foregoing events, the imposition of new or additional tariffs may limit our ability to manufacture tools, increase our selling and/or manufacturing costs, decrease margins, or
inhibit our ability to sell tools or to purchase necessary equipment and supplies, which could have a material adverse effect on our business, results of operations, or financial condition.

Moreover,  by  imposing  industrial  policies  and  other  economic  measures,  such  as  control  of  foreign  exchange,  taxation  and  foreign  investment,  the  mainland  China  central  government  exerts
considerable direct and indirect influence on the development of the mainland China economy. Other political, economic and social factors may also lead to further legal and regulatory changes and
reforms, which may adversely affect our operations and business development.

The  mainland  China  central  government  may  determine  to  exert  additional  control  over  offerings  conducted  overseas  or  foreign  investment  in  mainland  China-based  issuers,  which  could
result in a material change in operations of ACM Shanghai and cause significant declines in the value of ACM Research Class A common stock, or make them worthless.

The mainland China central government may determine to exert additional control over securities offerings conducted overseas and/or foreign investment in mainland China-based issuers, which
could result in a material adverse change in operations of ACM Shanghai and cause the value of ACM Research Class A common stock to significantly decline or become worthless. See also “—If
any mainland China central government authority were to determine that existing mainland China laws or regulations require that ACM Shanghai obtain the authority’s permission or approval to
continue the listing of ACM Research’s Class A common stock in the United States or if those existing mainland China laws and regulations, or interpretations thereof, were to change to require
such permission or approval, ACM Shanghai may be unable to obtain the required permission or approval or may only be able to obtain such permission or approval on terms and conditions that
impose material new restrictions and limitations on operation of ACM Shanghai, either of which could have a material adverse effect on our business, financial condition, results of operations,
reputation and prospects and on the trading price of ACM Research Class A common stock, which could decline in value or become worthless” above.

We could be adversely affected if we are unable to comply with legislation and regulations regarding improved access to audit and other information and audit inspections of accounting firms,
including registered public accounting firms, such as our prior and current audit firms, operating in mainland China.

We were one of the companies named in the SEC’s “Conclusive list of issuers identified under the HFCAA.” BDO China had been our independent registered public accounting firm in recent years,
including for the year ended December 31, 2021, and was not inspected by the PCAOB.

The HFCA Act, which became law in December 2020, includes requirements for the SEC to identify issuers whose audit work is performed by auditors that the PCAOB is unable to inspect or
investigate completely because of a restriction imposed by a non-U.S. authority in any non-U.S. jurisdiction. The HFCA Act also requires that, to the extent that the PCAOB has been unable to
inspect an issuer’s auditor for two consecutive years, the SEC shall prohibit the issuer’s securities registered in the United States from being traded on any national securities exchange or over-the-
counter market in the United States.

• On March 24, 2021, the SEC adopted interim final amendments to implement congressionally mandated submission and disclosure required of the HFCA Act, and on December 2, 2021,
the SEC adopted final amendments to finalize rules implementing the submission and disclosures in the HFCA Act. These final amendments apply to registrants that the SEC identifies as
having filed an Annual Report on Form 10-K (or certain other forms) with an audit report issued by a registered public accounting firm that is located in a foreign jurisdiction and that the
PCAOB has determined it is unable to inspect or investigate completely because of a position taken by any non-U.S. authority. Any such identified registrant will be required to submit
documentation to the SEC establishing that it is not owned or controlled by a governmental entity in that foreign jurisdiction and will also require disclosure in the registrant’s annual report
regarding the audit arrangements of, and governmental influence on, such a registrant.

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Furthermore,  on  June  22,  2021,  the  U.S.  Senate  passed  the  Accelerating  Holding  Foreign  Companies  Accountable  Act,  which  was  enacted  under  the  Consolidated  Appropriations  Act,
2023, on December 29, 2022, as further described below, and which amended the HFCA Act to require the SEC to prohibit an issuer’s securities from trading on any national securities
exchange or over-the-counter market in the United States if the PCAOB has been unable to inspect an issuer’s auditor for two, rather than three, consecutive years. On September 22, 2021,
the PCAOB adopted a final rule implementing the HFCA Act, which provides a framework for the PCAOB to use when determining, as contemplated under the HFCA Act, whether the
PCAOB is unable to inspect or investigate completely registered public accounting firms located in a foreign jurisdiction because of a position taken by one or more authorities in any non-
U.S. jurisdiction.

• On December 16, 2021, the PCAOB designated China and Hong Kong as jurisdictions where the PCAOB was not allowed to conduct full and complete audit inspections and identified
firms registered in such jurisdictions, including BDO China. Pursuant to each annual determination by the PCAOB, the SEC will, on an annual basis, identify issuers that have used non-
inspected audit firms.

• On March 8, 2022, the SEC published its first “Provisional list of issuers identified under the HFCAA.” Our company was identified on the SEC’s provisional list after we filed our Annual

Report on Form 10-K for the year ended December 31, 2021, which included an audit report issued by BDO China.
• On March 30, 2022, our company was transferred to the SEC’s “Conclusive list of issuers identified under the HFCAA.”
• On August 26, 2022, the PCAOB signed a Statement of Protocol, or SOP, Agreement with the CSRC and China’s Ministry of Finance. The SOP, together with two protocol agreements
governing inspections and investigation, establishes a specific, accountable framework to make possible complete inspections and investigations by the PCAOB of audit firms based in
China  and  Hong  Kong,  as  required  under  U.S.  law.  Pursuant  to  the  fact  sheet  with  respect  to  the  SOP  disclosed  by  the  SEC,  the  PCAOB  has  sole  discretion  to  select  the  audit  firms,
engagements and potential violations that it inspects or investigates and has the ability to transfer information to the SEC in the normal course. PCAOB inspectors and investigators can
view  all  audit  documentation  without  redaction,  and  the  PCAOB  can  retain  any  audit  information  it  reviews  as  needed  to  support  the  findings  of  its  inspections  and  investigations.  In
addition, the SOP allows the PCAOB to interview and take testimony of personnel associated with the audits that the PCAOB inspects or investigates.

• On December 15, 2022, the PCAOB announced that it was able to secure complete access to inspect and investigate PCAOB-registered public accounting firms headquartered in mainland
China and Hong Kong in 2022 and vacated its previous December 16, 2021 determination to the contrary. However, whether the PCAOB will continue to be able to satisfactorily conduct
inspections of PCAOB-registered public accounting firms headquartered in mainland China and Hong Kong is subject to uncertainty and depends on a number of factors out of our, and our
auditor’s,  control.  Mainland  China  authorities  will  need  to  ensure  that  the  PCAOB  continues  to  have  full  access  for  inspections  and  investigations  in  2023  and  beyond.  Each  year,  the
PCAOB will determine whether it can inspect and investigate completely audit firms in mainland China and Hong Kong, among other jurisdictions. If mainland China authorities do not
allow the PCAOB complete access for inspections and investigations for two consecutive years, the SEC would prohibit trading in the securities of issuers engaging those audit firms, as
required under the HFCA Act.

• On December 29, 2022, the Consolidated Appropriations Act, 2023, was signed into law by U.S. President Biden, which, among other things, amended the HFCA Act to reduce the number
of consecutive non-inspection years that would trigger the trading prohibition under the HFCA Act from three years to two years (originally such threshold under the HFCA Act was three
consecutive years), and so that any foreign jurisdiction could be the reason why the PCAOB does not have complete access to inspect or investigate a company’s public accounting firm
(originally the HFCA Act only applied if the PCAOB’s ability to inspect or investigate was due to a position taken by an authority in the jurisdiction where the relevant public accounting
firm was located).

Per current regulations, if ACM Research were to appear for two consecutive years on the “Conclusive list of issuers identified under the HFCAA”, the value of our securities may significantly
decline or become worthless, and our securities would be prohibited from trading and may eventually be delisted. It also remains unclear what further actions the SEC, the PCAOB or Nasdaq may
take to address these issues and what impact those actions will have on U.S. companies, such as ours, that have significant operations in mainland China and have securities listed on a U.S. stock
exchange. Any such actions could materially affect our operations and stock price, including by resulting in our being de-listed from Nasdaq or being required to engage a new audit firm, which
would require significant expense and management time.

On June 30, 2022, and June 15, 2023, stockholders of ACM Research ratified the appointment of Armanino LLP as our independent auditor for the years ended December 31, 2022 and 2023,
respectively.  Armanino  LLP  was  neither  headquartered  in  mainland  China  or  Hong  Kong  nor  was  it  subject  to  the  determinations  announced  by  the  PCAOB  on  December  16,  2021,  which
determinations were vacated by the PCAOB on December 15, 2022.

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On July 21, 2023, we were informed by Armanino that Armanino would resign as our independent auditor effective as of the earlier of (a) the date we engaged a new independent registered public
accounting firm or (b) the filing of our Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2023.

In  light  of  Armanino’s  determination,  on  September  14,  2023,  the  Audit  Committee  completed  a  competitive  selection  process  to  select  and  appoint  a  new  accounting  firm  to  serve  as  our
independent registered public accounting firm commencing with the audit of our financial statements for the fiscal year ending December 31, 2023. As a result of this process, the Audit Committee
approved the engagement of E&Y as our independent registered public accounting firm for the fiscal year ending December 31, 2023. The engagement of E&Y became effective on September 20,
2023. E&Y is a PCAOB-registered firm that is headquartered in mainland China; however, we do not believe ACM Research will appear on the “Conclusive list of issuers identified under the
HFCAA” for a second consecutive time, as the determinations announced by the PCAOB on December 16, 2021 were vacated by the PCAOB on December 15, 2022.

It may be difficult for overseas regulators to conduct investigations or collect evidence within mainland China.

Stockholder claims or regulatory investigations that are common in the United States generally are difficult to pursue as a matter of law or practicality in mainland China. For example, in mainland
China,  there  are  significant  legal  and  other  obstacles  to  providing  information  needed  for  regulatory  investigations  or  litigation  initiated  outside  of  mainland  China.  Although  the  authorities  in
mainland China may establish a regulatory cooperation mechanism with the securities regulatory authorities of another country or region to implement cross-border supervision and administration,
such cooperation with the securities regulatory authorities in the Unities States may not be efficient in the absence of mutual and practical cooperation mechanism. Furthermore, according to Article
177 of the mainland China Securities Law, or Article 177, which became effective in March 2020, no overseas securities regulator is allowed to directly conduct investigation or evidence collection
activities within the territory of mainland China. While detailed interpretation of or implementing rules under Article 177 have yet to be promulgated, the inability for an overseas securities regulator
to directly conduct investigation or evidence collection activities within mainland China may further increase difficulties faced by you in protecting your interests.

Because substantially all of our assets are located outside of the United States and certain of our directors and officers reside outside of the United States, it may be difficult for you to enforce
your rights based on the U.S. federal securities laws against such assets or officers and directors or to enforce a judgment of a United States court against assets or officers and directors in
mainland China.

While ACM Research is a Delaware corporation, certain of our officers and directors are nonresidents of the United States, and certain of our assets are located in mainland China, and the operations
of  ACM  Shanghai  are  conducted  in  mainland  China.  It  may,  therefore,  not  be  possible  to  effect  service  of  process  on  such  persons  in  the  United  States,  and  it  may  be  difficult  to  enforce  any
judgments rendered against them or any of our assets that are located overseas. Moreover, there is doubt whether courts in mainland China would enforce (a) judgments of United States courts
against ACM Shanghai, our directors or officers based on the civil liability provisions of the securities laws of the United States or any state, or (b) in original actions brought in mainland China,
liabilities against us or any nonresidents based upon the securities laws of the United States or any state.

We conduct substantially all of our operations outside the United States and face risks associated with conducting business in foreign markets.

Substantially all of our sales in 2023, 2022, and 2021 were made to customers outside the United States. Our manufacturing center has been located in Shanghai since 2006 and substantially all of
our operations are located in mainland China. We expect that all of our significant activities will remain outside the United States in the future. We are subject to a number of risks associated with
our international business activities, including:

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imposition of, or adverse changes in, foreign laws or regulatory requirements, such as work stoppages and travel restrictions imposed in connection with the COVID-19 pandemic;
the need to comply with the import laws and regulations of various foreign jurisdictions, including a range of U.S. import laws;
potentially adverse tax consequences, including withholding tax rules that may limit the repatriation of our earnings, and higher effective income tax rates in foreign countries where we
conduct business;
competition from local suppliers with which potential customers may prefer to do business;
seasonal reduction in business activity, such as during the Lunar New Year in parts of Asia and in other periods in various individual countries;

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increased exposure to foreign currency exchange rates;
reduced protection for intellectual property;
longer sales cycles and reliance on indirect sales in certain regions;
increased length of time for shipping and acceptance of our products;
greater difficulty in responding to customer requests for maintenance and spare parts on a timely basis;
greater difficulty in enforcing contracts and accounts receivable collection and longer collection periods;
difficulties in staffing and managing foreign operations and the increased travel, infrastructure and legal and compliance costs associated with multiple international locations;
heightened risk of unfair or corrupt business practices in certain geographies and of improper or fraudulent sales arrangements that may impact financial results and result in restatements
of, or irregularities in, our consolidated financial statements; and
general economic conditions, geopolitical events or natural disasters in countries where we conduct our operations or where our customers are located, including political unrest, war, acts
of terrorism or responses to such events.

In particular, the Asian market is extremely competitive, and chip manufacturers may be aggressive in seeking price concessions from suppliers, including chip equipment manufacturers.

We may not be successful in developing and implementing policies and strategies that will be effective in managing these risks in each country in which we do business. Our failure to manage these
risks successfully could adversely affect our business, operating results and financial condition.

Fluctuation in foreign currency exchange rates may adversely affect our results of operations and financial position.

Our results of operations and financial position could be adversely affected as a result of fluctuations in foreign currency exchange rates. Although our financial statements are denominated in U.S.
dollars, a sizable portion of our costs are denominated in other currencies, principally the Chinese Renminbi and, to a lesser extent, the Korean Won. Because many of our raw material purchases are
denominated in Renminbi while the majority of the purchase orders we receive are denominated in U.S. dollars, exchange rates have a significant effect on our gross margin. We have not engaged in
any foreign currency exchange hedging transactions to date, and any strategies that we may use in the future to reduce the adverse impact of fluctuations in foreign currency exchange rates may not
be  successful.  Our  foreign  currency  exposure  with  respect  to  assets  and  liabilities  for  which  we  do  not  have  hedging  arrangements  could  have  a  material  impact  on  our  results  of  operations  in
periods when the U.S. dollar significantly fluctuates in relation to unhedged non-U.S. currencies in which we transact business.

The exacerbation or further continuation of currently challenging global systemic economic and financial conditions could adversely affect our business, results of operations and financial
condition.

Any prolonged slowdown in mainland China, United States or global economy may have a negative impact on our business, results of operations and financial condition. Market reactions to the
global outbreak of COVID-19 have negatively affected the world’s financial markets since March 2020, and a continuation of those reactions may cause a potential slowdown of the local, regional
and global economy. Financial and other markets in the United States and worldwide have experienced significant volatility reflecting uncertainty over, among other things, (a) the long-term effects
of the expansionary monetary and fiscal policies adopted by the central banks and financial authorities of some of the world’s leading economies, including the United States and mainland China,
(b) unrest in Ukraine, the Middle East and Africa, and (c) the rising level of inflation in major industrial countries, including the United States, and worries that efforts to curb inflation may result in
an economic recession. General inflation, including rising energy prices, interest rates and wages, could adversely impact our business by increasing our operating and borrowing costs as well as
limiting the amount of capital available for customers to purchase our products. This economic turmoil has had, and could continue to have, a number of repercussions on our business, including
significant decreases in orders from our customers, business slowdowns or cessations at key suppliers resulting in delays in our product deliveries, increased raw material prices leading to increased
production  costs  that  we  may  not  be  able  to  pass  onto  customers,  and  business  challenges  at  customers  resulting  in  the  inability  to  obtain  credit  to  finance  purchases  of  our  products  or  even
insolvency, and counterparty failures negatively impacting our operations and sales. Any systemic economic or financial crisis could cause revenues for the semiconductor industry as a whole to
decline dramatically, which could materially and adversely affect our results of operations.

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Risks Related to Our Business and Our Industry

We may require additional capital in the future and we cannot give any assurance that such capital will be available at all or available on terms acceptable to us and, if it is available, additional
capital raised by us may dilute holders of Class A common stock.

We may need to raise funds in the future, depending on many factors, including:

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our sales growth;
the costs of applying our existing technologies to new or enhanced products;
the costs of developing new technologies and introducing new products;
the costs associated with protecting our intellectual property;
the  costs  associated  with  our  expansion,  including  capital  expenditures  and  Lingang-related  land  purchases  and  deposits,  and  with  increasing  our  sales  and  marketing  and  service  and
support efforts, and with expanding our geographic operations;
our ability to continue to obtain governmental subsidies for developmental projects in the future;
future debt repayment obligations; and
the number and timing of any future acquisitions.

To the extent that our existing sources of cash, together with any cash generated from operations, are insufficient to fund our activities, we may need to raise additional funds through public or
private financings, strategic relationships, or other arrangements. Additional funding may not be available to us on acceptable terms or at all. If adequate funding is not available, we may be required
to reduce expenditures, including curtailing our growth strategies and reducing our product development efforts, or to forego acquisition opportunities.

Proceeds received by ACM Shanghai from the initial placements of shares with mainland China investors, from the STAR IPO in connection with the STAR Listing of ACM Shanghai shares on the
STAR Market, and from future financing activities undertaken by ACM Shanghai (including follow-on offerings or private placements of shares with mainland China investors), will generally be
used to grow and support our mainland China operations. Those proceeds generally are not available for distribution to ACM Research. Under existing mainland China laws and regulations, it may
be difficult, if not impossible, for ACM Research to be able to receive dividends comprised of funds generated by ACM Shanghai and, even if such dividends can be paid from mainland China to
the United States, any such dividends can be paid to ACM Research only if other holders of ACM Shanghai shares receive their pro rata dividends. As a result, it is unlikely that funds raised or
generated by ACM Shanghai will be readily distributable to ACM Research.

If we succeed in raising additional funds through the issuance of equity or convertible securities, then the issuance could result in substantial dilution to existing stockholders. Furthermore, the
holders  of  these  new  securities  or  debt  may  have  rights,  preferences  and  privileges  senior  to  those  of  the  holders  of  Class  A  common  stock.  In  addition,  any  preferred  equity  issuance  or  debt
financing that we may obtain in the future could have restrictive covenants relating to our capital raising activities and other financial and operational matters, which may make it more difficult for
us to obtain additional capital and to pursue business opportunities, including potential acquisitions.

Our quarterly operating results can be difficult to predict and can fluctuate substantially, which could result in volatility in the price of Class A common stock.

Our quarterly revenue and other operating results have varied in the past and are likely to continue to vary significantly from quarter to quarter. Accordingly, you should not rely upon our past
quarterly financial results as indicators of future performance. Any variations in our quarter-to-quarter performance may cause our stock price to fluctuate. Our financial results in any given quarter
can be influenced by a variety of factors, including:

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the cyclicality of the semiconductor industry and the related impact on the purchase of equipment used in the manufacture of chips;
the timing of purchases of our tools by chip fabricators, which order types of tools based on multi-year capital plans under which the number and dollar amount of tool purchases can vary
significantly from year to year;
the relatively high average selling price of our tools and our dependence on a limited number of customers for a substantial portion of our revenue in any period, whereby the timing and
volume of purchase orders or cancellations from our customers could significantly reduce our revenue for that period;
the significant expenditures required to customize our products often exceed the deposits received from our customers;
the lead time required to manufacture our tools;

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the timing of recognizing revenue due to the timing of shipment and acceptance of our tools;
our ability to sell additional tools to existing customers;
the changes in customer specifications or requirements;
the length of our product sales cycle;
changes in our product mix, including the mix of systems, upgrades, spare parts and service;
the timing of our product releases or upgrades or announcements of product releases or upgrades by us or our competitors, including changes in customer orders in anticipation of new
products or product enhancements;
our ability to enhance our tools with new and better functionality that meet customer requirements and changing industry trends;
constraints on our suppliers’ capacity;
our ability to sell our tools to Chinese customers due to regulatory restrictions, including the addition of our customers to the Entity List;
the  ability  of  other  suppliers  to  provide  sufficient  quantities  of  their  tools  to  our  Chinese  customers  which  may  indirectly  impact  the  production  plans  of  our  customers  and  result  in  a
reduction of demand for our tools;
the timing of investments in research and development related to releasing new applications of our technologies and new products;
delays in the development and manufacture of our new products and upgraded versions of our products and the market acceptance of these products when introduced;
our ability to control costs, including operating expenses and the costs of the components and subassemblies used in our products;
the costs related to the acquisition and integration of product lines, technologies or businesses; and
the costs associated with protecting our intellectual property, including defending our intellectual property against third-party claims or litigation.

Seasonality has played an increasingly important role in the market for chip manufacturing tools. The period of November through February has been a particularly weak period historically for
manufacturers of chip tools, in part because capital equipment needed to support manufacturing of chips for the December holidays usually needs to be in the supply chain by no later than October
and chip makers in Asia often wait until after Chinese, or Lunar, New Year, which occurs in January or February, before implementing their capital acquisition plans. The timing of new product
releases also has an impact on seasonality, with the acquisition of manufacturing equipment occurring six to nine months before a new release.

Many of these factors are beyond our control, and the occurrence of one or more of them could cause our operating results to vary widely. As a result, it is difficult for us to forecast our quarterly
revenue  accurately.  Our  results  of  operations  for  any  quarter  may  not  be  indicative  of  results  for  future  quarters  and  quarter-to-quarter  comparisons  of  our  operating  results  are  not  necessarily
meaningful. Variability in our periodic operating results could lead to volatility in our stock price. Because a substantial proportion of our expenses are relatively fixed in the short term, our results
of operations will suffer if revenue falls below our expectations in a particular quarter, which could cause the price of Class A common stock to decline. Moreover, as a result of any of the foregoing
factors,  our  operating  results  might  not  meet  our  announced  guidance  or  expectations  of  public  market  analysts  or  investors,  in  which  case  the  price  of  Class  A  common  stock  could  decrease
significantly.

Cyclicality in the semiconductor industry is likely to lead to substantial variations in demand for our products, and as a result our operating results could be adversely affected.

The chip industry has historically been cyclic and is characterized by wide fluctuations in product supply and demand. From time to time, this industry has experienced significant downturns, often
in connection with, or in anticipation of, maturing product and technology cycles, excess inventories and declines in general economic conditions. This cyclicality could cause our operating results
to decline dramatically from one period to the next.

Our  business  depends  upon  the  capital  spending  of  chip  manufacturers,  which,  in  turn,  depends  upon  the  current  and  anticipated  market  demand  for  chips.  During  industry  downturns,  chip
manufacturers  often  have  excess  manufacturing  capacity  and  may  experience  reductions  in  profitability  due  to  lower  sales  and  increased  pricing  pressure  for  their  products.  As  a  result,  chip
manufacturers generally sharply curtail their spending during industry downturns and historically have lowered their spending more than the decline in their revenues. If we are unable to control our
expenses adequately in response to lower revenue from our customers, our operating results will suffer and we could experience operating losses. For example, certain industry analysts, such as
Gartner, forecast a decline for global WFE investments in 2024 as further described in “Item 1. Business”. We cannot reasonably estimate the duration or impact of such a downturn, and it could
have a material adverse effect on our business and the value of our Class A common stock.

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Conversely, during industry upturns we must successfully increase production output to meet expected customer demand. This may require us or our suppliers, including third-party contractors, to
order additional inventory, hire additional employees and expand manufacturing capacity. If we are unable to respond to a rapid increase in demand for our tools on a timely basis, or if we misjudge
the timing, duration or magnitude of such an increase in demand, we may lose business to our competitors or incur increased costs disproportionate to any gains in revenue, which could have a
material adverse effect on our business, results of operations, financial condition or cash flows.

The mainland China government is implementing focused policies, including state-led investment initiatives, that aim to create and support an independent domestic semiconductor supply chain
spanning  from  design  to  final  system  production.  If  these  policies,  which  include  loans  and  subsidies,  result  in  lower  demand  for  equipment  than  is  expected  by  equipment  manufacturers,  the
resulting overcapacity in the chip manufacturing equipment market could lead to excess inventory and price discounting that could have a material adverse effect on our business and operating
results.

We depend on a small number of customers for a substantial portion of our revenue, and the loss of, or a significant reduction in orders from, one or more of our major customers could have a
material adverse effect on our revenue and operating results. There are also a limited number of potential customers for our products.

The chip manufacturing industry is highly concentrated, and we derive most of our revenue from a limited number of customers. A total of three customers accounted for 45.5% of our revenue in
2023, three customers accounted for 43.8% of our revenue in 2022, and two customers accounted for 48.9% of our revenue in 2021.

As a consequence of the concentrated nature of our customer base, our revenue and results of operations may fluctuate from quarter to quarter and are difficult to estimate, and any cancellation of
orders or any acceleration or delay in anticipated product purchases or the acceptance of shipped products by our larger customers could materially affect our revenue and results of operations in any
quarterly period.

We may be unable to sustain or increase our revenue from our larger customers or offset the discontinuation of concentrated purchases by our larger customers with purchases by new or existing
customers. We expect a small number of customers will continue to account for a high percentage of our revenue for the foreseeable future and that our results of operations may fluctuate materially
as a result of such larger customers’ buying patterns. Thus, our business success depends on our ability to maintain strong relationships with our customers. The loss of any of our key customers for
any reason, or a change in our relationship with any of our key customers, including a significant delay or reduction in their purchases, may cause a significant decrease in our revenue, which we
may not be able to recapture due to the limited number of potential customers.

We have seen, and may see in the future, consolidation of our customer base. Industry consolidation generally has negative implications for equipment suppliers, including a reduction in the number
of potential customers, a decrease in aggregate capital spending and greater pricing leverage on the part of consumers over equipment suppliers. Continued consolidation of the chip industry could
make it more difficult for us to grow our customer base, increase sales of our products and maintain adequate gross margins.

Our success will depend on industry chip manufacturers adopting our SAPS, TEBO, Tahoe, ECP, furnace and other technologies.

To date our strategy for commercializing our tools has been to place them with selected industry leaders in the manufacturing of memory and logic chips, the two largest chip categories, to enable
those  leading  manufacturers  to  evaluate  our  technologies,  and  then  leverage  our  reputation  to  gain  broader  market  acceptance.  In  order  for  these  industry  leaders  to  adopt  our  tools,  we  need  to
establish our credibility by demonstrating the differentiated, innovative nature of our SAPS, TEBO, Tahoe, ECP, furnace and other technologies. If these leading manufacturers do not agree that our
technologies add significant value over conventional technologies or do not otherwise accept and use our tools, we may need to spend a significant amount of time and resources to enhance our
technologies or develop new technologies. Even if these leading manufacturers adopt our technologies, other manufacturers may not choose to accept and adopt our tools and our products may not
achieve widespread adoption. Any of the above factors would have a material adverse effect on our business, results of operations and financial condition.

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If our SAPS, TEBO, Tahoe, ECP, furnace and other technologies do not achieve widespread market acceptance, we will not be able to compete effectively.

The commercial success of our tools will depend, in part, on gaining substantial market acceptance by chip manufacturers. Our ability to gain acceptance for our products will depend upon a number
of factors, including:

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our  ability  to  demonstrate  the  differentiated,  innovative  nature  of  our  SAPS,  TEBO,  Tahoe,  ECP,  furnace  and  other  technologies  and  the  advantages  of  our  tools  over  those  of  our
competitors;
compatibility of our tools with existing or potential customers’ manufacturing processes and products;
the level of customer service available to support our products; and
the experiences our customers have with our products.

In  addition,  obtaining  orders  from  new  customers  may  be  difficult  because  many  chip  manufacturers  have  pre-existing  relationships  with  our  competitors.  Chip  manufacturers  must  make  a
substantial investment to qualify and integrate wet processing equipment into a chip production line. Due, in part, to the cost of manufacturing equipment and the investment necessary to integrate a
particular manufacturing process, a chip manufacturer that has selected a particular supplier’s equipment and qualified that equipment for production typically continues to use that equipment for the
specific production application and process node, which is the minimum line width on a chip, as long as that equipment continues to meet performance specifications. Some of our potential and
existing customers may prefer larger, more established vendors from which they can purchase equipment for a wider variety of process steps than our tools address. Further, because the cleaning
process with our TEBO equipment can be up to five times longer than cleaning processes based on other technologies, we must convince chip manufacturers of the innovative, differentiated nature
of our technologies and the benefits associated with using our tools. If we are unable to obtain new customers and continue to achieve widespread market acceptance of our tools, then our business,
operations, financial results and growth prospects will be materially and adversely affected.

If we do not continue to enhance our existing tools and achieve market acceptance, we will not be able to compete effectively.

We operate in an industry that is subject to evolving standards, rapid technological changes and changes in customer demands. Additionally, if process nodes continue to shrink to ever-smaller
dimensions  and  conventional  two-dimensional  chips  reach  their  critical  performance  limitations,  the  technology  associated  with  manufacturing  chips  may  advance  to  a  point  where  our  Ultra  C
equipment based on SAPS, TEBO, Tahoe, ECP, furnace and other technologies becomes obsolete. Accordingly, the future of our business will depend in large part upon the continuing relevance of
our technological capabilities, our ability to interpret customer and market requirements in advance of tool deliveries, and our ability to introduce in a timely manner new tools that address chip
makers’ requirements for cost-effective cleaning solutions. We expect to spend a significant amount of time and resources developing new tools and enhancing existing tools. Our ability to introduce
and market successfully any new or enhanced cleaning equipment is subject to a wide variety of challenges during the tool’s development, including the following:

accurate anticipation of market requirements, changes in technology and evolving standards;
the availability of qualified product designers and technologies needed to solve difficult design challenges in a cost-effective, reliable manner;
our ability to design products that meet chip manufacturers’ cost, size, acceptance and specification criteria, and performance requirements;
the ability and availability of suppliers and third-party manufacturers to manufacture and deliver the critical components and subassemblies of our tools in a timely manner;

•
•
•
•
• market acceptance of our customers’ products, and the lifecycle of those products; and
•

our ability to deliver products in a timely manner within our customers’ product planning and deployment cycle.

Certain enhancements to our products in future periods may reduce demand for our pre-existing tools. As we introduce new or enhanced cleaning tools, we must manage the transition from older
tools in order to minimize disruptions in customers’ ordering patterns, avoid excessive levels of older tool inventories and ensure timely delivery of sufficient supplies of new tools to meet customer
demand. Furthermore, product introductions could delay purchases by customers awaiting arrival of our new products, which could cause us to fail to meet our expected level of production orders
for pre-existing tools.

Our success will depend on our ability to identify and enter new product markets.

We expect to spend a significant amount of time and resources identifying new product markets in addition to the market for cleaning solutions and in developing new products for entry into these
markets. Product development requires

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significant investments in engineering hours, third-party development costs, prototypes and sample materials, as well as sales and marketing expenses, which will not be recouped if the product
launch is unsuccessful. We may fail to predict the needs of other markets accurately or develop new, innovative technologies to address those needs. Further, we may not be able to design and
introduce new products in a timely or cost-efficient manner, and our new products may be more costly to develop, may fail to meet the requirements of the market, or may be adopted slower than we
expect.  If  we  are  not  able  to  introduce  new  products  successfully,  our  inability  to  gain  market  share  in  new  product  markets  could  adversely  affect  our  ability  to  sustain  our  revenue  growth  or
maintain our current revenue levels.

If we fail to establish and maintain a reputation for credibility and product quality, our ability to expand our customer base will be impaired and our operating results may suffer.

We must develop and maintain a market reputation for innovative, differentiated technologies and high quality, reliable products in order to attract new customers and achieve widespread market
acceptance  of  our  products.  Our  market  reputation  is  critical  because  we  compete  against  several  larger,  more  established  competitors,  many  of  which  supply  equipment  for  a  larger  number  of
process steps than we do to a broader customer base in an industry with a limited number of customers. In these circumstances, traditional marketing and branding efforts are of limited value, and
our success depends on our ability to provide customers with reliable and technically sophisticated products. If the limited customer base does not perceive our products and services to be of high
quality and effectiveness, our reputation could be harmed, which could adversely impact our ability to achieve our targeted growth.

We operate in a highly competitive industry and many of our competitors are larger, better-established, and have significantly greater operating and financial resources than we have.

The chip equipment industry is highly competitive, and we face substantial competition throughout the world in each of the markets we serve. Many of our current and potential competitors have,
among other things:

greater financial, technical, sales and marketing, manufacturing, distribution and other resources;
established credibility and market reputations;
longer operating histories;
broader product offerings;

•
•
•
•
• more extensive service offerings, including the ability to have large inventories of spare parts available near, or even at, customer locations;
•
• more extensive geographic coverage.

local sales forces; and

These competitors may also have the ability to offer their products at lower prices by subsidizing their losses in wet cleaning with profits from other lines of business in order to retain current or
obtain new customers. Among other things, some competitors have the ability to offer bundled discounts for customers purchasing multiple products. Many of our competitors have more extensive
customer and partner relationships than we do and may therefore be in a better position to identify and respond to market developments and changes in customer demands. Potential customers may
prefer  to  purchase  from  their  existing  suppliers  rather  than  a  new  supplier,  regardless  of  product  performance  or  features.  If  we  are  not  able  to  compete  successfully  against  existing  or  new
competitors, our business, operating results and financial condition will be negatively affected.

Our customers do not generally enter into long-term purchase commitments, and they may decrease, cancel or delay their projected purchases at any time.

In accordance with industry practice, our sales are on a purchase order basis, which we seek to obtain three to four months in advance of the expected product delivery date. Until a purchase order is
received, we do not have a binding purchase commitment. Our customers to date have provided us with non-binding one- to two-year forecasts of their anticipated demands, but those forecasts can
be changed at any time, without any required notice to us. Because the lead-time needed to produce a tool customized to a customer’s specifications can extend up to six months, we may need to
begin production of tools based on non-binding forecasts, rather than waiting to receive a binding purchase order. No assurance can be made that a customer’s forecast will result in a firm purchase
order within the time period we expect, or at all.

If we do not accurately predict the amount and timing of a customer’s future purchases, we risk expending time and resources on producing a customized tool that is not purchased by a particular
customer, which may result in excess or unwanted inventory, or we may be unable to fulfill an order on the schedule required by a purchase order, which would result in foregone sales. Customers
may place purchase orders that exceed forecasted amounts, which could result in delays

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in  our  delivery  time  and  harm  our  reputation.  In  the  future  a  customer  may  decide  not  to  purchase  our  tools  at  all,  may  purchase  fewer  tools  than  it  did  in  the  past  or  may  otherwise  alter  its
purchasing patterns, and the impact of any such actions may be intensified given our dependence on a small number of large customers. Our customers make major purchases periodically as they
add capacity or otherwise implement technology upgrades. If any significant customers cancel, delay or reduce orders, our operating results could suffer.

We  may  incur  significant  expenses  long  before  we  can  recognize  revenue  from  new  products,  if  at  all,  due  to  the  costs  and  length  of  research,  development,  manufacturing  and  customer
evaluation process cycles.

We often incur significant research and development costs for products that are purchased by our customers only after much, or all, of the cost has been incurred or that may never be purchased. We
allow some new customers, or existing customers considering new products, to evaluate products without any payment becoming due unless the product is ultimately accepted, which means we may
invest a significant amount in manufacturing a tool that may never be accepted and purchased or may be purchased months or even years after production. In the past we have borrowed money in
order to fund first-time purchase order equipment and next-generation evaluation equipment. When we deliver evaluation equipment, or a “first tool,” we may not recognize revenue or receive
payment for the tool for 24 months or longer. Even returning customers may take as long as six months to make any payments. If our sales efforts are unsuccessful after expending significant
resources, or if we experience delays in completing sales, our future cash flow, revenue and profitability may fluctuate or be materially adversely affected.

Our sales cycle is long and unpredictable, which results in variability of our financial performance and may require us to incur high sales and marketing expenses with no assurance that a sale
will result, all of which could adversely affect our profitability.

Our results of operations may fluctuate, in part, because of the resource-intensive nature of our sales efforts and the length and variability of our sales cycle. A sales cycle is the period between
initial contact with a prospective customer and any sale of our tools. Our sales process involves educating customers about our tools, participating in extended tool evaluations and configuring our
tools to customer-specific needs, after which customers may evaluate the tools. The length of our sales cycle, from initial contact with a customer to the execution of a purchase order, is generally 6
to 24 months. During the sales cycle, we expend significant time and money on sales and marketing activities and make investments in evaluation equipment, all of which lower our operating
margins, particularly if no sale occurs or if the sale is delayed as a result of extended qualification processes or delays from our customers’ customers.

The duration or ultimate success of our sales cycle depends on factors such as:

•
•
•
•

efforts by our sales force;
the complexity of our customers’ manufacturing processes and the compatibility of our tools with those processes;
our customers’ internal technical capabilities and sophistication; and
our customers’ capital spending plans and processes, including budgetary constraints, internal approvals, extended negotiations or administrative delays.

It is difficult to predict exactly when, or even if, we will make a sale to a potential customer or if we can increase sales to our existing customers. As a result, we may not recognize revenue from our
sales efforts for extended periods of time, or at all. The loss or delay of one or more large transactions in a quarter could impact our results of operations for that quarter and any future quarters for
which revenue from that transaction is lost or delayed. In addition, we believe that the length of the sales cycle and intensity of the evaluation process may increase for those current and potential
customers that centralize their purchasing decisions.

Difficulties in forecasting demand for our tools may lead to periodic inventory shortages or excess spending on inventory items that may not be used.

We need to manage our inventory of components and production of tools effectively to meet changing customer requirements. Accurately forecasting customers’ needs is difficult. Our tool demand
forecasts are based on multiple assumptions, including non-binding forecasts received from our customers years in advance, each of which may introduce error into our estimates. Inventory levels
for components necessary to build our tools in excess of customer demand may result in inventory write-downs and could have an adverse effect on our operating results and financial condition.
Conversely, if we underestimate demand for our tools or if our manufacturing partners fail to supply components we require at the time we need them, we may experience inventory shortages. Such
shortages might delay production or

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shipments to customers and may cause us to lose sales. These shortages may also harm our credibility, diminish the loyalty of our channel partners or customers.

A failure to prevent inventory shortages or accurately predict customers’ needs could result in decreased revenue and gross margins and harm our business.

Some of our products and supplies may become obsolete or be deemed excess while in inventory due to rapidly changing customer specifications, changes in product structure, components or bills
of material as a result of engineering changes, or a decrease in customer demand. We also have exposure to contractual liabilities to our contract manufacturers for inventories purchased by them on
our behalf, based on our forecasted requirements, which may become excess or obsolete. Our inventory balances also represent an investment of cash. To the extent our inventory turns are slower
than we anticipate based on historical practice, our cash conversion cycle extends and more of our cash remains invested in working capital. If we are not able to manage our inventory effectively,
we may need to write down the value of some of our existing inventory or write off non-saleable or obsolete inventory. Any such charges we incur in future periods could materially and adversely
affect our results of operations.

The difficulty in forecasting demand also makes it difficult to estimate our future results of operations and financial condition from period to period. A failure to accurately predict the level of
demand for our products could adversely affect our net revenue and net income, and we are unlikely to forecast such effects with any certainty in advance.

If our tools contain defects or do not meet customer specifications, we could lose customers and revenue.

Highly complex tools such as ours may develop defects during the manufacturing and assembly process. We may also experience difficulties in customizing our tools to meet customer specifications
or detecting defects during the development and manufacturing of our tools. Some of these failures may not be discovered until we have expended significant resources in customizing our tools, or
until our tools have been installed in our customers’ production facilities. These quality problems could harm our reputation as well as our customer relationships in the following ways:

our customers may delay or reject acceptance of our tools that contain defects or fail to meet their specifications;

•
• we may suffer customer dissatisfaction, negative publicity and reputational damage, resulting in reduced orders or otherwise damaging our ability to retain existing customers and attract

new customers;

the attention of our technical and management resources may be diverted;

• we may incur substantial costs as a result of warranty claims or service obligations or in order to enhance the reliability of our tools;
•
• we may be required to replace defective systems or invest significant capital to resolve these problems; and
• we may be required to write off inventory and other assets related to our tools.

In addition, defects in our tools or our inability to meet the needs of our customers could cause damage to our customers’ products or manufacturing facilities, which could result in claims for
product liability, tort or breach of warranty, including claims from our customers. The cost of defending such a lawsuit, regardless of its merit, could be substantial and could divert management’s
attention from our ongoing operations. In addition, if our business liability insurance coverage proves inadequate with respect to a claim or future coverage is unavailable on acceptable terms or at
all, we may be liable for payment of substantial damages. Any or all of these potential consequences could have an adverse impact on our operating results and financial condition.

Warranty claims in excess of our estimates could adversely affect our business.

We have provided warranties against manufacturing defects of our tools that range from 12 to 36 months in duration. Our product warranty requires us to provide labor and parts necessary to repair
defects. As of December 31, 2023, we had accrued $9.8 million in liability contingency for potential warranty claims. Warranty claims substantially in excess of our expectations, or significant
unexpected costs associated with warranty claims, could harm our reputation and could cause customers to decline to place new or additional orders, which could have a material adverse effect on
our business, results of operations and financial condition.

We  rely  on  third  parties  to  manufacture  significant  portions  of  our  tools  and  our  failure  to  manage  our  relationships  with  these  parties  could  harm  our  relationships  with  our  customers,
increase our costs, decrease our sales and limit our growth.

Our tools are complex and require components and subassemblies having a high degree of reliability, accuracy and performance. We rely on third parties to manufacture most of the subassemblies
and supply most of the components used

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in our tools. Accordingly, we cannot directly control our delivery schedules and quality assurance. This reliance on third parties and lack of control could result in shortages or quality assurance
problems. In addition, supply chain constraints have intensified due to a variety of factors, including the ongoing COVID-19 pandemic and the June 2022 truck driver strike in Korea, where certain
of our operations and customers are located. See also “—Our supply chain may be materially adversely impacted due to global events, including continuing COVID-19 outbreaks, transportation
delays and the armed conflict in Ukraine.” These issues and our ability to manage increased demand could delay shipments of our tools, increase our testing or production costs or lead to costly
failure claims.

We do not have long-term supply contracts with some of our suppliers, and those suppliers are not obligated to perform services or supply products to us for any specific period, in any specific
quantities or at any specific price, except as may be provided in a particular purchase order. In addition, we attempt to maintain relatively low inventories and acquire subassemblies and components
only as needed. There are significant risks associated with our reliance on these third-party suppliers, including:

•
•
•
•

•
•

potential price increases;
capacity shortages or other inability to meet any increase in demand for our products;
reduced control over manufacturing process for components and subassemblies and delivery schedules;
limited ability of some suppliers to manufacture and sell subassemblies or parts in the volumes we require and at acceptable quality levels and prices, due to the suppliers’ relatively small
operations and limited manufacturing resources;
increased exposure to potential misappropriation of our intellectual property; and
limited warranties on subassemblies and components supplied to us.

Any  delays  in  the  shipment  of  our  products  due  to  our  reliance  on  third-party  suppliers  could  harm  our  relationships  with  our  customers.  In  addition,  any  increase  in  costs  due  to  our  suppliers
increasing the price they charge us for subassemblies and components or arising from our need to replace our current suppliers that we are unable to pass on to our customers could negatively affect
our operating results.

Our supply chain may be materially adversely impacted due to global events, including continuing COVID‑19 outbreaks, transportation delays and the armed conflict in Ukraine.

We  rely  upon  the  facilities  of  our  global  suppliers  with  operations  in  mainland  China,  Japan,  Taiwan  and  the  United  States  to  support  our  business.  We  source  the  substantial  majority  of  our
components from Asia, and as a result, our supply chain can be adversely affected by a variety of global events, including COVID-19 restrictions, transportation delays, including those related to the
June 2022 truck driver strike in Korea resulting from escalated fuel prices, and the armed conflict in Ukraine. As a result of these types of global events and resulting governmental and business
reactions, our suppliers may not have the materials, capacity, or capability to supply our components according to our schedule and specifications. Further, there may be logistics issues, including
our ability and our supply chain’s ability to quickly ramp up production, labor issues and transportation demands that may cause further delays. Supply chain constraints have intensified due to
COVID-19 and other factors, and may further intensify due to other global events, contributing to existing global shortages coupled with increased demand in the supply of semiconductors. The
unavailability of any component or supplier could result in production delays, underutilized facilities, and loss of access to critical raw materials and parts for producing and supporting our tools,
and could impact our ongoing capacity expansion and our ability to fulfill our product delivery obligations. If our suppliers’ operations are curtailed, we may need to seek alternate sources of supply,
which may be more expensive. Alternate sources may not be available or may result in delays in shipments to us from our supply chain and subsequently to our customers, each of which would
affect our results of operations. These types of disruptions and governmental restrictions may also result in the inability of our customers to obtain materials necessary for their full production, which
could also result in reduced demand for our products. While disruptions and governmental restrictions, as well as related general limitations on movement around the world, are expected to be
temporary, the duration of the production and supply chain disruption, and related financial impact, cannot be estimated at this time. Should the production and distribution closures continue for an
extended period of time, the impact on our supply chain could have a material adverse effect on our results of operations and cash flows. Business disruptions could also negatively affect the sources
and availability of components and materials that are essential to the operation of our business. Moreover, our customers source a range of production equipment, supplies and services from other
suppliers with operations around the world, and any reduction in supply capacity at those customers’ factories may reduce or even halt those customers’ production and result in a decrease in the
demand for our products.

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Any shortage of components or subassemblies could result in delayed delivery of products to us or in increased costs to us, which could harm our business.

The  ability  of  our  manufacturers  to  supply  our  tools  is  dependent,  in  part,  upon  the  availability  of  certain  components  and  subassemblies.  Our  manufacturers  may  experience  shortages  in  the
availability of such components or subassemblies, which could result in delayed delivery of products to us or in increased costs to us. Any shortage of components or subassemblies or any inability
to  control  costs  associated  with  manufacturing  could  increase  the  costs  for  our  products  or  impair  our  ability  to  ship  orders  in  a  timely  cost-efficient  manner.  As  a  result,  we  could  experience
cancellation of orders, refusal to accept deliveries or a reduction in our prices and margins, any of which could harm our financial performance and results of operations.

We depend on a limited number of suppliers, including single source suppliers, for critical components and subassemblies, and our business could be disrupted if they are unable to meet our
needs.

We depend on a limited number of suppliers for components and subassemblies used in our tools. Certain components and subassemblies of our tools have only been purchased from our current
suppliers to date and changing the source of those components and subassemblies may result in disruptions during the transition process and entail significant delay and expense. We rely on: Product
Systems, Inc., or ProSys, as the sole supplier of megasonic transducers, a key subassembly used in our single-wafer cleaning equipment; Ninebell Co., Ltd., or Ninebell, as the principal supplier of
robotic delivery system subassemblies used in our single-wafer cleaning equipment; and Advanced Electric Co. Inc., as a key supplier of valves used in our single-wafer cleaning equipment. An
adverse change to our relationship with any of these suppliers would disrupt our production of single-wafer cleaning equipment and could cause substantial harm to our business.

With some of these suppliers, we do not have long-term agreements and instead purchase components and subassemblies through a purchase order process. As a result, these suppliers may stop
supplying us components and subassemblies, limit the allocation of supply and equipment to us due to increased industry demand or significantly increase their prices at any time with little or no
advance  notice.  Our  reliance  on  a  limited  number  of  suppliers  could  also  result  in  delivery  problems,  reduced  control  over  product  pricing  and  quality,  and  our  inability  to  identify  and  qualify
another supplier in a timely manner.

Moreover,  some  of  our  suppliers  may  experience  financial  difficulties  that  could  prevent  them  from  supplying  us  with  components  or  subassemblies  used  in  the  design  and  manufacture  of  our
products. In addition, our suppliers, including our sole supplier ProSys, may experience manufacturing delays or shut downs due to circumstances beyond their control, such as labor issues, political
unrest or natural disasters. Any supply deficiencies could materially and adversely affect our ability to fulfill customer orders and our results of operations. We have in the past and may in the future,
experience delays or reductions in supply shipments, which could reduce our revenue and profitability. If key components or materials are unavailable, our costs would increase and our revenue
would decline.

The success of our business will depend on our ability to manage any future growth.

We  have  experienced  rapid  growth  in  our  business  recently  due,  in  part,  to  an  expansion  of  our  product  offerings  and  an  increase  in  the  number  of  customers  that  we  serve.  For  example,  our
headcount  grew  by  32%  in  2023,  38%  in  2022,  and  62%  in  2021.  We  will  seek  to  continue  to  expand  our  operations  in  the  future,  including  by  adding  new  offices,  locations  and  employees.
Managing our growth has placed and could continue to place a significant strain on our management, other personnel and our infrastructure. If we are unable to manage our growth effectively, we
may  not  be  able  to  take  advantage  of  market  opportunities,  develop  new  products,  enhance  our  technological  capabilities,  satisfy  customer  requirements,  respond  to  competitive  pressures  or
otherwise execute our business plan. In addition, any inability to manage our growth effectively could result in operating inefficiencies that could impair our competitive position and increase our
costs disproportionately to the amount of growth we achieve. To manage our growth, we believe we must effectively:

•

hire,  train,  integrate  and  manage  additional  qualified  engineers  for  research  and  development  activities,  sales  and  marketing  personnel,  service  and  support  personnel  and  financial  and
information technology personnel;

• manage multiple relationships with our customers, suppliers and other third parties; and
continue to enhance our information technology infrastructure, systems and controls.
•

Our organizational structure has become more complex, including as a result of the STAR Listing and the STAR IPO. We will need to continue to scale and adapt our operational, financial and
management controls, as well as our reporting systems and procedures, at both ACM Research and ACM Shanghai. The continued expansion of our infrastructure will

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require us to commit substantial financial, operational and management resources before our revenue increases and without any assurances that our revenue will increase.

We are highly dependent on our Chief Executive Officer and President and other senior management and key employees.

Our success largely depends on the skills, experience and continued efforts of our management, technical and sales personnel, including in particular Dr. David H. Wang, the Chair of the Board,
Chief Executive Officer and President of ACM Research. All of our senior management are at-will employees, which means either we or the employee may terminate their employment at any time.
If one or more of our other senior management personnel were unable or unwilling to continue their employment with us, we may not be able to replace them in a timely manner. Moreover, in
connection with the STAR Listing and the STAR IPO, ACM Shanghai is now managed by a group of officers separate from those of ACM Research and those officers owe fiduciary duties to the
various stakeholders of ACM Shanghai. We do not have employment or retention agreements with, or maintain key person life insurance policies on, any of our employees. Our business may be
severely disrupted and our financial condition and results of operations may be materially and adversely affected. In addition, our senior management may join a competitor or form a competing
company. The loss of Dr. Wang or other key management personnel, including our Chief Financial Officer, could significantly delay or prevent the achievement of our business objectives.

Failure to attract and retain qualified personnel could put us at a competitive disadvantage and prevent us from effectively growing our business.

Our  future  success  depends,  in  part,  on  our  ability  to  continue  to  attract  and  retain  highly  skilled  personnel.  There  is  substantial  competition  for  experienced  management,  technical  and  sales
personnel in the chip equipment industry. If qualified personnel become scarce or difficult to attract or retain for compensation-related or other reasons, we could experience higher labor, recruiting
or training costs. New hires may require significant training and time before they achieve full productivity and may not become as productive as we expect. If we are unable to retain and motivate
our  existing  employees  and  attract  qualified  personnel  to  fill  key  positions,  we  may  experience  inadequate  levels  of  staffing  to  develop  and  market  our  products  and  perform  services  for  our
customers, which could have a negative effect on our operating results.

Our ability to utilize certain U.S. and state net operating loss carryforwards may be limited under applicable tax laws.

As of December 31, 2023, we had net operating loss carryforward amounts, or NOLs, of $3.3 million for U.S. federal income tax purposes and $0.6 million for U.S. state income tax purposes. As of
December 31, 2022, we had NOLs of $4.4 million for U.S. federal income tax purposes and $0.5 million for U.S. state income tax purposes. As of December 31, 2021, we had NOLs of $56.1
million for U.S. federal income tax purposes and $0.5 million for U.S. state income tax purposes. The federal and state NOLs will expire at various dates in the future.

Utilization of these NOLs could be subject to a substantial annual limitation if the ownership change limitations under U.S. Internal Revenue Code Sections 382 and 383 and similar U.S. state
provisions are triggered by changes in the ownership of our capital stock. Such an annual limitation would result in the expiration of the NOLs before utilization. Our existing NOLs may be subject
to limitations arising from previous ownership changes, including in connection with our initial public offering and concurrent private placement in November 2017, our follow-on public offering in
August 2019, and any future equity issuances. Future changes in our stock ownership, some of which are outside of our control, could result in an ownership change. Regulatory changes, such as
suspensions on the use of NOLs, or other unforeseen reasons, may cause our existing NOLs to expire or otherwise become unavailable to offset future income tax liabilities. Additionally, U.S. state
NOLs generated in one state cannot be used to offset income generated in another U.S. state. For these reasons, we may be limited in our ability to realize tax benefits from the use of our NOLs,
even if our profitability would otherwise allow for it.

Acquisitions that we pursue in the future, whether or not consummated, could result in other operating and financial difficulties.

In the future we may seek to acquire additional product lines, technologies or businesses in an effort to increase our growth, enhance our ability to compete, complement our product offerings, enter
new  and  adjacent  markets,  obtain  access  to  additional  technical  resources,  enhance  our  intellectual  property  rights  or  pursue  other  competitive  opportunities.  We  may  also  make  investments  in
certain key suppliers to align our interests with such suppliers. If we seek acquisitions, we

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may not be able to identify suitable acquisition candidates at prices we consider appropriate. We cannot readily predict the timing or size of our future acquisitions, or the success of any future
acquisitions.

To  the  extent  that  we  consummate  acquisitions  or  investments,  we  may  face  financial  risks  as  a  result,  including  increased  costs  associated  with  merged  or  acquired  operations,  increased
indebtedness, economic dilution to gross and operating profit and earnings per share, or unanticipated costs and liabilities. Acquisitions may involve additional risks, including:

the acquired product lines, technologies or businesses may not improve our financial and strategic position as planned;

•
• we may determine we have overpaid for the product lines, technologies or businesses, or that the economic conditions underlying our acquisition have changed;
• we may have difficulty integrating the operations and personnel of the acquired company;
• we may have difficulty retaining the employees with the technical skills needed to enhance and provide services with respect to the acquired product lines or technologies;
the acquisition may be viewed negatively by customers, employees, suppliers, financial markets or investors;
•
• we may have difficulty incorporating the acquired product lines or technologies with our existing technologies;
• we may encounter a competitive response, including price competition or intellectual property litigation;
• we may encounter difficulties related to required CFIUS approval (see also “-Regulatory Risks-Certain of our investments may be subject to review by and approval from CFIUS, which

may prevent us from taking advantage of investment opportunities that would otherwise be advantageous to our stockholders”);

• we may become a party to product liability or intellectual property infringement claims as a result of our sale of the acquired company’s products;
• we may incur one-time write-offs, such as acquired in-process research and development costs, and restructuring charges;
• we may acquire goodwill and other intangible assets that are subject to impairment tests, which could result in future impairment charges;
•

our  ongoing  business  and  management’s  attention  may  be  disrupted  or  diverted  by  transition  or  integration  issues  and  the  complexity  of  managing  geographically  or  culturally  diverse
enterprises; and
our due diligence process may fail to identify significant existing issues with the target business.

•

From time to time, we may enter into negotiations for acquisitions or investments that are not ultimately consummated. These negotiations could result in significant diversion of management time,
as well as substantial out-of-pocket costs, any of which could have a material adverse effect on our business, operating results and financial condition.

Future declines in the semiconductor industry, and the overall world economic conditions on which the industry is significantly dependent, could have a material adverse impact on our results
of operations and financial condition.

Our business depends on the capital equipment expenditures of chip manufacturers, which in turn depend on the current and anticipated market demand for integrated circuits. With the consolidation
of customers within the industry, the chip capital equipment market may experience rapid changes in demand driven both by changes in the market generally and the plans and requirements of
particular customers. Global economic and business conditions, which are often unpredictable, have historically impacted customer demand for our products and normal commercial relationships
with our customers, suppliers and creditors. Additionally, in times of economic uncertainty our customers’ budgets for our tools, or their ability to access credit to purchase them, could be adversely
affected.  This  would  limit  their  ability  to  purchase  our  products  and  services.  As  a  result,  economic  downturns  could  cause  material  adverse  changes  to  our  results  of  operations  and  financial
condition including:

•
•
•
•
•
•
•
•
•
•

a decline in demand for our products;
an increase in reserves on accounts receivable due to our customers’ inability to pay us;
an increase in reserves on inventory balances due to excess or obsolete inventory as a result of our inability to sell such inventory;
valuation allowances on deferred tax assets;
restructuring charges;
asset impairments;
a decline in the value of our investments;
exposure to claims from our suppliers for payment on inventory that is ordered in anticipation of customer purchases that do not come to fruition;
a decline in the value of certain facilities we lease to less than our residual value guarantee with the lessor; and
challenges maintaining reliable and uninterrupted sources of supply.

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Fluctuating levels of investment by chip manufacturers may materially affect our aggregate shipments, revenue, operating results and earnings. Where appropriate, we will attempt to respond to
these fluctuations with cost management programs aimed at aligning our expenditures with anticipated revenue streams, which could result in restructuring charges. Even during periods of reduced
revenues,  we  must  continue  to  invest  in  research  and  development  and  maintain  extensive  ongoing  worldwide  customer  service  and  support  capabilities  to  remain  competitive,  which  may
temporarily harm our profitability and other financial results.

Regulatory Risks

Our ability to sell our tools to customers in mainland China and certain other countries has been impacted, and will likely continue to be materially and adversely impacted, by export license
requirements, other regulatory changes, or other actions taken by the U.S. or other governmental agencies.

ACM Shanghai utilizes certain items subject to export controls under the U.S. Export Administration Regulations (EAR) in manufacturing and supplying its products. The EAR applies to exports of
commodities, software and technology from the United States, including for use in manufacturing products outside the United States, as well as to certain products manufactured outside the United
States that incorporate, or are based on, designated U.S. content, software or technology. The Bureau of Industry and Security of the U.S. Department of Commerce (BIS), which administers the
EAR,  recently  imposed,  and  may  continue  to  impose,  additional  restrictions  under  the  EAR  on  certain  exports  to  China,  to  include  Hong  Kong  and  Macau,  including  restrictions  targeting  the
semiconductor manufacturing industry in China. These types of restrictions may impact the operations of ACM Shanghai.

In  October  2022,  BIS  announced  new  rules  that  significantly  expanded  U.S.  export  controls  as  applied  to  advanced  IC  products,  related  manufacturing  equipment  and  technology,  and
supercomputers, where the destination or ultimate end user is based in mainland China. In the case of semiconductor manufacturing equipment, the new rules require an export license for the export,
re-export, or transfer to or within mainland China of additional types of semiconductor manufacturing equipment, items for use in manufacturing designated types of semiconductor manufacturing
equipment  (along  with  other  items  subject  to  the  EAR,  for  use  in  the  development  or  production  of  ICs),  and  semiconductor  manufacturing  equipment  for  use  at  certain  IC  manufacturing  and
development facilities in mainland China. In most cases, license applications for these exports are reviewed under a presumption of denial. In addition, BIS imposed new restrictions by which U.S.
persons anywhere in the world are effectively barred from engaging in certain activities related to the development and production of semiconductors at mainland China fabrication facilities meeting
specified criteria, even if no items subject to the EAR are involved. The October 2022 restrictions were later expanded to include Macau.

These new restrictions have impacted the procurement by ACM Shanghai of certain items from the United States, and of certain items subject to U.S. export controls from outside the United States,
for use in manufacturing its products.

In October 2023, BIS further expanded export controls on semiconductors, semiconductor manufacturing items and items for use in manufacturing designated types of semiconductor manufacturing
equipment, including through new licensing requirements covering a broader variety of items, and an expansion in the geographical scope of the controls.

ACM Shanghai has determined that several of its customers have mainland China-based facilities that meet the restricted criteria set out in the October 2022 and October 2023 rules, and has also
determined that several of its products, and/or components for its products, may meet the parameters of export control classification numbers, or ECCNs, affected by the restrictions. ACM and ACM
Shanghai have implemented modifications to their existing business policies and practices in response to the October 2022 and October 2023 restrictions, including by imposing limitations on the
activities of their U.S. persons and undertaking measures in connection with their supply chains more broadly to comply with the new regulations. ACM Shanghai is continuing to assess the impact
of the October 2023 changes, together with the October 2022 rules, and will continually adjust or modify its policies and practices as required to comply with these or other related updates. Based on
our  ongoing  review,  we  believe  these  regulations  may  directly  impact  ACM  Shanghai’s  ability  to  meet  its  future  production  plans,  or  indirectly  impact  the  spending  plans  of  ACM  Shanghai’s
customer base. ACM may not be able to import, or may face substantial restrictions in importing, certain parts from the United States or parts subject to U.S. export controls from outside the United
States to support tool shipments to such facilities, or to be embedded into tools defined by affected ECCNs.

We  believe  that  as  a  result  of  the  October  2022  and  October  2023  restrictions,  several  ACM  Shanghai  customers  have  significantly  reduced  production  and  related  capital  spending  at  facilities
meeting the restricted advanced node capabilities. In addition, ACM Shanghai has experienced challenges as the companies in its supply chain adapt their policies to the new regulations. These
factors had an adverse impact on ACM Shanghai’s shipments and sales in the twelve months ended

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December 31, 2023. We anticipate these factors will continue to have an adverse impact on ACM Shanghai’s shipments and sales in future periods, including as a result of any impacts from the
October 2023 revisions.

Alongside these new restrictions, BIS has also continued to designate additional China entities, many involved in the semiconductor manufacturing industry, on restricted party lists under the EAR,
such as the Entity List and the Unverified List. These designations impose licensing requirements for the supply of products to such entities. In most cases, any items subject to the EAR, including
foreign produced products with specified U.S. content or that are the product of specified U.S. origin software, technology, or equipment, now require an export license from BIS before they can be
supplied to the newly listed China entities, regardless of their export classification. In December 2020, SMIC, one of the largest chip manufacturers in mainland China and one of our key customers,
was one of numerous entities added to the Entity List. Challenges faced by SMIC and its key suppliers as a result of the listing have indirectly impacted SMIC’s demand for, and ACM Shanghai’s
ability to supply, ACM Shanghai products. More recently, in October 2022, YMTC, a leading mainland China memory chip company and one of our key customers, was added to the Unverified List
of the EAR alongside a number of other Chinese entities. The Unverified List identifies parties for whom BIS has been unable to confirm their bona fides (i.e., legitimacy and reliability about the
end-use and end-user of items subject to the EAR). Entities listed on the Unverified List are ineligible to receive items subject to the EAR by means of a license exception if a U.S. export license is
required.  In  December  2022,  YMTC  was  moved  from  the  Unverified  List  to  the  Entity  List.  Challenges  faced  by  YMTC  and  its  key  suppliers  as  a  result  of  the  listing  could  indirectly  impact
YMTC’s demand for, or ACM Shanghai’s ability to supply, ACM Shanghai products.

We cannot be certain what additional actions the U.S. government may take with respect to China entities, or whether such actions will impact our relationships with our mainland China-based
customers. Additional actions could take the form of further revisions to the Entity List or Unverified List, new export restrictions, further expansions to the geographic scope of the controls, or
additional tariffs or other trade restrictions. It is also possible that other countries could adopt similar semiconductor-focused export controls to align with the October 2022 and October 2023 U.S.
actions.

During the three and twelve months ended December 30, 2023, two prominent exporters of advanced semiconductor manufacturing equipment, the Netherlands and Japan, announced and began to
implement plans to join the United States in imposing semiconductor-focused export controls.

On  May  23,  2023,  the  Japanese  government  issued  the  final  amendment  to  an  ordinance  implementing  new  export  controls  to  require  licensing  for  export  of  certain  advanced  semiconductor
manufacturing equipment, effective as of July 23, 2023. The amendment expands the scope of export controls to prohibit (1) exporting 23 additional categories of items relating to semiconductor
manufacturing  and  (2)  providing  technology  relating  to  manufacturing,  development  or  use  of  these  categories  of  items,  in  both  cases,  without  an  advance  license. While  the  expanded  export
controls apply to exports to any jurisdiction, exports to certain jurisdictions, such as the United States, are expected to be permitted by certain types of broad general licenses. However, it remains to
be seen whether the Japanese government will authorize any exports of these items to mainland China by a limited general license or specific license, if at all.

Likewise,  on  September  30,  2023,  the  Government  of  the  Netherlands  published  additional  export  control  measures  for  advanced  semiconductor  manufacturing  equipment.  The  Regulation  on
Advanced Semiconductor Manufacturing Equipment entered force on September 1, 2023. From that point on, the export of certain advanced semiconductor manufacturing equipment, as specified in
the Annex to the Regulation, is now subject to a national export license authorization requirement by the Dutch Central Import and Export Service.

As a result of the new restrictions, the ability of ACM Shanghai to acquire such parts from Japan and the Netherlands to fulfill customer requirements, and the ability of ACM Shanghai’s customers
in mainland China to scale their production, could be further negatively impacted by these additional controls. The introduction of additional multilateral semiconductor-focused export controls
could further negatively impact ACM Shanghai’s supply arrangements.

We  are  unable  to  predict  the  duration  of  the  restrictions  imposed  by  the  U.S.  government,  Japan  and  the  Netherlands  or  the effects  of  any  future  governmental  actions  by  the  U.S.,  Japan,  the
Netherlands or other countries that may impact our relationships with our mainland China-based customers, any of which could have a long-term adverse effect on our business, operating results
and financial condition.

Changes in government trade policies could limit the demand for our tools and increase the cost of our tools.

General trade tensions between the United States and mainland China escalated beginning in 2018, and have continued to escalate. Since 2018, the U.S. government has imposed new or higher
tariffs on specified imported products originating from mainland China in response to what the U.S. government characterized as unfair trade practices. The mainland China

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government responded to each of these rounds of U.S. tariff changes by imposing new or higher tariffs on specified products imported from the United States. Higher tariffs and additional rounds of
tariffs have been suggested or threatened by U.S. and mainland China officials. More recently, in late 2023 and early 2024, U.S. officials have suggested potentially targeting Chinese origin legacy
semiconductors with additional tariffs. Certain U.S. officials have also called for revocation of, or revisions to, China’s permanent normal trade relations (PNTR) status, which would increase tariffs
significantly on goods of Chinese origin. In the event any such increased tariffs take effect, it is possible that the Chinese government could respond with additional tariffs or restrictions.

The imposition of heightened tariffs on imports by both the U.S. and mainland China governments and the surrounding economic uncertainty may negatively impact the semiconductor industry,
including by reducing the demand of fabricators for capital equipment such as our tools. Further changes in trade policy, including by tariffs, additional taxes, restrictions on exports or other trade
barriers,  or  restrictions  on  supplies,  equipment,  and  raw  materials  including  rare  earth  minerals,  may  limit  the  ability  of  our  customers  to  manufacture  or  sell  semiconductors  or  to  make  the
manufacture or sale of semiconductors more expensive and less profitable, which could lead those customers to fabricate fewer semiconductors and to invest less in capital equipment such as our
tools.  In  addition,  if  mainland  China  were  to  impose  additional  tariffs  on  raw  materials,  subsystems  or  other  supplies  that  we  source  from  the  United  States,  our  cost  for  those  supplies  would
increase. As a result of any of the foregoing events, the imposition of new or additional tariffs may limit our ability to manufacture tools, increase our selling and/or manufacturing costs, decrease
margins, or inhibit our ability to sell tools or to purchase necessary equipment and supplies, which could have a material adverse effect on our business, results of operations, or financial condition.

Changes in political and economic policies of the mainland China government may materially and adversely affect our business, financial condition and results of operations and may result in
our inability to sustain our growth and expansion strategies.

Substantially all of our operations are conducted in mainland China, and a substantial majority of our revenue is sourced from mainland China. Accordingly, our financial condition and results of
operations are affected to a significant extent by economic, political and legal development in mainland China.

The Chinese economy differs from the economies of most developed countries in many respects, including the extent of government involvement, level of development, growth rate, and control of
foreign exchange and allocation of resources. Although the mainland China government has implemented measures emphasizing the utilization of market forces for economic reform, the reduction
of state ownership of productive assets and the establishment of improved corporate governance in business enterprises, a substantial portion of productive assets in mainland China are still owned
by  the  government.  In  addition,  the  mainland  China  government  continues  to  play  a  significant  role  in  regulating  industry  development  by  imposing  industrial  policies.  The  mainland  China
government also exercises significant control over economic growth in mainland China by allocating resources, controlling payment of foreign currency-denominated obligations, setting monetary
policy, regulating financial services and institutions, and providing preferential treatment to particular industries or companies.

While the mainland China economy has experienced significant growth in the past three decades, growth has been uneven, both geographically and among various sectors of the economy. The
mainland China government has implemented various measures to encourage economic growth and guide the allocation of resources. Some of these measures may benefit the overall mainland
China  economy,  but  may  also  have  a  negative  effect  on  us.  Our  financial  condition  and  results  of  operation  could  be  materially  and  adversely  affected  by  government  control  over  capital
investments  or  changes  in  tax  regulations  that  are  applicable  to  us.  In  the  past  the  mainland  China  government  has  implemented  measures  to  control  the  pace  of  economic  growth,  and  similar
measures in the future may cause decreased economic activity, which in turn could lead to a reduction in demand for our products and consequently have a material adverse effect on our businesses,
financial condition and results of operations.

Although the mainland China government has been implementing policies to develop an independent domestic semiconductor industry supply chain, there is no guaranteed time frame in which
these initiatives will be implemented. We cannot guarantee that the implementation of these policies will result in additional revenue to us or that our presence in mainland China will result in
support from the mainland China government. To the extent that any capital investment or other assistance from the mainland China government is not provided to us, it could be used to promote
the products and technologies of our competitors, which could adversely affect our business, operating results and financial condition.

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Changes in political and economic policies with respect to mainland China may make it difficult for us to realize the benefit of our investments.

On November 12, 2020, then-U.S. President Trump issued an executive order, or the Order, establishing a new sanctions program designed to prohibit U.S. persons from entering into transactions in
certain publicly traded securities, as well as derivatives and securities designed to provide investment exposure to such securities, of any “Communist Chinese military company,” or CCMC, as
designated  by  the  U.S.  Department  of  Defense,  or  DOD,  or  the  U.S.  Secretary  of  the  Treasury.  Continued  ownership  of  such  securities  by  U.S.  persons  would  be  prohibited  after  a  one-year
divestment period from the time of designation of the issuer. A number of mainland China issuers have been designated under this program and more could be added.

On  December  3,  2020,  SMIC  was  designated  as  a  CCMC  by  the  DOD,  which  was  subsequently  removed  as  of  June  3,  2021.  If  SMIC  had  remained  on  the  list  at  December  3,  2021,  ACM
Shanghai’s continued possession of SMIC securities could have subjected ACM Shanghai and ACM Research to penalties. Certain implementation matters related to the scope of, and compliance
with, the Order have not yet been resolved, and the ultimate application and enforcement of the Order may change due to, among other things, a change in the U.S. Presidential administration.

In addition, SMIC may be designated as a CCMC in the future, or we may seek to conduct business transactions with entities on the CCMC list in the future. Although the Order does not prohibit
commercial relations with CCMC companies other than the securities transactions noted above, certain other export restrictions have been imposed under the Export Administration Regulations on
some CCMC companies. These and any similar future U.S. government restrictions on our suppliers or customers may adversely affect our business operations in mainland China, overall company
results or our financial condition.

Mainland  China’s  currency  exchange  control  and  government  restrictions  on  investment  repatriation  may  impact  our  ability  to  transfer  funds  outside  of  mainland  China,  which  could
materially and adversely affect our ability to grow, make investments or acquisitions that could benefit our business, otherwise fund and conduct our business, or pay dividends on our common
stock.

We  generate  substantially  all  of  our  revenue  through  ACM  Shanghai,  our  mainland  China  subsidiary.  Mainland  China  statutory  laws  and  regulations  permit  payments  of  dividends  by  ACM
Shanghai  only  out  of  its  retained  earnings,  which  are  determined  in  accordance  with  mainland  China  accounting  standards  and  regulations  that  differ  from  U.S.  generally  accepted  accounting
principles. Mainland China regulations and ACM Shanghai’s articles of association require annual appropriations of 10% of net after-tax profits to be set aside, prior to payment of dividends, as a
reserve or surplus fund, which restricts ACM Shanghai’s ability to transfer a portion of its net assets to us. Such reserved funds can only be used for specific purposes and are not transferable to
ACM in the form of loans, advances or cash dividends.

As a result of these and other restrictions under mainland China laws and regulations as well as restrictions under ACM Shanghai’s bank loan agreements, we may be significantly restricted in our
ability to transfer a portion of ACM Shanghai’s net assets to ACM or other subsidiaries of ACM. We have no assurance that mainland China governmental authorities in the future will not limit
further  or  eliminate  the  ability  of  ACM  Shanghai  to  purchase  foreign  currencies  and  transfer  such  funds  to  ACM  to  meet  its  liquidity  or  other  business  needs.  Any  inability  to  access  funds  in
mainland China, if and when needed for use outside of mainland China, could have a material and adverse effect on our liquidity and our business.

Certain  of  our  investments  may  be  subject  to  review  by  and  approval  from  CFIUS,  which  may  prevent  us  from  taking  advantage  of  investment  opportunities  that  would  otherwise  be
advantageous to our stockholders.

Certain of our investments may be subject to review by and approval from the U.S. Committee on Foreign Investment in the U.S., or CFIUS. In the event that CFIUS reviews one or more of our
investments, there can be no assurances that we will be able to maintain or proceed with such investments on terms acceptable to us. Additionally, CFIUS may seek to impose limitations on one or
more  such  investments  that  may  prevent  us  from  maintaining  or  pursuing  investment  opportunities  that  we  otherwise  would  have  maintained  or  pursued,  which  could  adversely  affect  the
performance of our investments and thus our overall performance. Certain of our stockholders may be non-U.S. investors, and in the aggregate, may comprise a substantial portion of our net asset
value,  which  may  increase  the  risks  of  such  limitations  being  imposed  in  connection  with  investments  pursued  or  made  by  us.  Legislative  and  regulatory  changes,  including  changes  to  agency
practice, in the future may negatively impact our ability to realize value from certain existing and future investments, including by limiting exit opportunities or causing us to favor buyers that we
believe are less likely to require CFIUS review, even in circumstances where other buyers may offer better terms or more consideration.

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The U.S. Government is reportedly considering an outbound investment review mechanism, which may prevent us from taking advantage of investment opportunities outside the United States
that could otherwise be advantageous to our stockholders.

The U.S. Government is reportedly considering imposing an outbound investment review mechanism similar to CFIUS that would review foreign investments made from the United States. It is not
yet clear what form the mechanism would take, but reports suggest it could come quickly in the form of an Executive Order, or could be passed as part of legislation from Congress. In the event that
such  a  review  mechanism  is  implemented,  it  is  possible  that  certain  of  our  investments  may  require  review  or  notification  to  the  U.S.  Government,  and  could  be  subject  to  mitigation  or  other
restrictions. If implemented, similar to CFIUS reviews, there can be no assurances that we will be able to maintain or proceed with investments on terms acceptable to us. Such a mechanism could
negatively impact our ability to realize value from certain existing and future investments, including by limiting exit opportunities or causing us to favor buyers that we believe are lower risk for the
possible outbound investment reviews, even in circumstances where other buyers may offer better terms or more consideration. Furthermore, because the requirements have not yet been established,
the  range  or  extent  of  possible  effects  that  could  flow  from  such  a  measure  cannot  be  determined  with  any  degree  of  certainty  at  this  time.  It  is  possible  that  the  outbound  investment  review
mechanism could adversely affect our business, financial condition, and operating results.

We are subject to government regulation, including import, export, economic sanctions, and anti-corruption laws and regulations, that may limit our sales opportunities, expose us to liability
and increase our costs.

Our products are subject to import and export controls in jurisdictions in which we distribute or sell our products. Import and export controls and economic sanctions laws and regulations include
restrictions  and  prohibitions  on  the  sale  or  supply  of  certain  products  and  on  our  transfer  of  parts,  components,  and  related  technical  information  and  know-how  to  certain  countries,  regions,
governments, persons and entities.

Various countries regulate the importation of certain products through import permitting and licensing requirements and have enacted laws that could limit our ability to distribute our products. The
exportation, re-exportation, transfers within foreign countries and importation of our products, including by our partners, must comply with these laws and regulations, and any violations may result
in reputational harm, government investigations and penalties, or a denial or curtailment of exporting privileges. Complying with export control and sanctions laws for a particular sale may be time
consuming, may increase our costs, and may result in the delay or loss of sales opportunities. If we are found to be in violation of U.S. sanctions or export control laws, or similar laws in other
jurisdictions, we and the individuals working for us could incur substantial fines and penalties. Changes in export, sanctions or import laws or regulations may delay the introduction and sale of our
products in international markets, require us to expend resources to seek necessary government authorizations or develop different versions of our products, or, in some cases, prevent the export or
import of our products to certain countries, regions, governments, persons or entities, which could adversely affect our business, financial condition and operating results.

We are subject to various domestic and international anti-corruption laws, such as the U.S. Foreign Corrupt Practices Act, as well as similar anti-bribery and anti-kickback laws and regulations in the
United States and other jurisdictions. These laws and regulations generally prohibit companies and their intermediaries from offering or making improper payments to non-U.S. officials for the
purpose of obtaining, retaining or directing business. Our exposure for violating these laws and regulations increases as our international presence expands and as we increase sales and operations in
foreign jurisdictions.

Risks Related to Our STAR Listing

We may not achieve the results contemplated by our business strategy and our strategy for growth in mainland China may not result in increases in the price of Class A common stock.

We cannot assure you that we will realize any or all of our anticipated benefits of the STAR Listing and the STAR IPO, which may not have the anticipated effects of including the strengthening of
our market position and operations in mainland China. ACM Shanghai continues to have broad discretion in the use of the proceeds from the initial sales of shares to investors and the proceeds from
the  STAR  IPO,  and  will  have  similar  discretion  over  the  use  of  proceeds  from  future  financing  activities  (including  follow-on  offerings  or  private  placements  of  shares  with  mainland  China
investors). ACM Shanghai may not spend or invest those proceeds in a manner that results in our operating success or with which ACM Research stockholders agree. Our failure to successfully
leverage the completion of the STAR Listing and the STAR IPO, and any future financings by ACM Shanghai, to expand our mainland China business could result in a decrease in the

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price of the Class A common stock, and we cannot assure you that the success of ACM Shanghai will have an attendant positive effect on the price of the Class A common stock.

Mainland China companies are critical to the global semiconductor industry, and our current business is substantially concentrated in the mainland China market. Our inability to build, or any delay
in growing, our mainland China-based operations would materially and adversely limit our operations and operating results, including our revenue growth.

ACM Shanghai’s status as a publicly traded company that is controlled, but less than wholly owned, by ACM Research could have an adverse effect on us.

In November 2021, we completed the STAR Listing and STAR IPO with respect to shares of ACM Shanghai. ACM Shanghai is our principal operating company and, prior to the STAR Listing
process, was a wholly owned subsidiary of ACM Research. As the result of actions taken in connection with the STAR Listing and the STAR IPO, ACM Shanghai is no longer a wholly owned
subsidiary of ACM Research, and the interests of ACM Shanghai may diverge from the interests of ACM Research and its other subsidiaries in the future. We may face conflicts of interest in
managing, financing or engaging in transactions with ACM Shanghai, or allocating business opportunities between our subsidiaries, including future arrangements for operating subsidiaries other
than ACM Shanghai to license and use our intellectual property. Substantially all of our intellectual property has been developed in mainland China and is owned by ACM Shanghai. As we expand
our global operations through operating subsidiaries outside of mainland China, those operating subsidiaries may need to license intellectual property from ACM Shanghai in order to operate, and
there can be no assurance that conflicts of interest will not preclude those operating subsidiaries from licensing the required intellectual property from ACM Shanghai on reasonable terms or at all.

ACM Research retains majority ownership of ACM Shanghai since the STAR IPO, but ACM Shanghai is managed by a separate board of directors and officers and those directors and officers will
owe fiduciary duties to the various stakeholders of ACM Shanghai, including shareholders other than ACM Research. In the operation of ACM Shanghai’s business, there may be situations that
arise whereby the directors and officers of ACM Shanghai, in the exercise of their fiduciary duties, take actions that may be contrary to the best interests of ACM Research.

In  the  future,  ACM  Shanghai  may  issue  options,  restricted  shares  and  other  forms  of  share-based  compensation  to  its  directors,  officers  and  employees,  which  could  dilute  ACM  Research’s
ownership in ACM Shanghai. In addition, ACM Shanghai may engage in capital raising activities in the future that could further dilute ACM Research’s ownership interest. For example, on January
25, 2024, we announced that ACM Shanghai intends to offer up to 43.6 million of its ordinary shares in a private offering to qualified buyers in compliance with the requirements of the China
Securities Regulatory Commission, which would constitute up to 10% of ACM Shanghai’s share capital prior to the transaction. If consummated in full, we estimate that our equity interest in ACM
Shanghai  would  decline  from  82.1%  to  approximately  74.6%.  The  consummation  of  the  proposed  transaction  is  subject  to  market  conditions,  the  approval  of  ACM  Shanghai’s  shareholders,
completion of the review process by the Shanghai Stock Exchange, completion of the registration process by the China Securities Regulatory Commission, and other factors. We estimate that if
consummated in full, the proposed transaction would generate gross proceeds of up to RMB 4.5 billion ($625 million) to ACM Shanghai, whose management would have broad discretion over the
use of such proceeds. It is unlikely that any of such proceeds would be distributed to ACM Research.

ACM Research and ACM Shanghai both are public reporting companies but each is subject to separate, and potentially inconsistent, accounting and disclosure requirements, which may lead
to investor confusion or uncertainty that could cause decreased demand for, or fluctuations in the price of, one or both of the companies’ publicly traded shares.

Since ACM Shanghai completed the STAR Listing and the STAR IPO in November 2021, it has been subject to accounting, disclosure and other regulatory requirements of the STAR Market. At the
same time, ACM Research remains subject to accounting, disclosure and other regulatory requirements of the SEC and the Nasdaq Global Market, or Nasdaq. As a result, ACM Research and ACM
Shanghai periodically will disclose information simultaneously pursuant to differing laws and regulations. Even though substantially all of the operations of ACM Research are currently conducted
through  ACM  Shanghai,  the  information  disclosed  by  the  two  companies  will  differ,  and  may  differ  materially  from  time  to  time,  due  to  the  distinct,  and  potentially  inconsistent,  accounting
standards applicable to the two companies and disclosure requirements imposed by securities regulatory authorities, as well as differences in language, culture and expression habit, in composition
of investors in the United States and mainland China, and in the capital markets of the United States and mainland China.

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Differing disclosures could lead to confusion or uncertainty among investors in the publicly traded shares of one or both companies. Differences between the price of ACM Shanghai shares on the
STAR Market and the price of ACM Research Class A common stock on Nasdaq could lead to increased volatility, as some investors seek to arbitrage price differences. Moreover, such volatility
could be exacerbated by the fact that ACM Shanghai shares currently represent substantially all of the assets of ACM Research.

Risks Related to Our Intellectual Property and Data Security

Our success depends on our ability to protect our intellectual property, including our SAPS, TEBO, Tahoe, ECP, furnace and other technologies.

Our commercial success depends in part on our ability to obtain and maintain patent and trade secret protection for our intellectual property, including our SAPS, TEBO, Tahoe, ECP, furnace and
other technologies and the design of our Ultra C equipment, as well as our ability to operate without infringing upon the proprietary rights of others. There can be no assurance that our patent
applications will result in additional patents being issued or that issued patents will afford sufficient protection against competitors with similar technology, nor can there be any assurance that the
patents issued will not be infringed, designed around, or invalidated by third parties. Even issued patents may later be found unenforceable or may be modified or revoked in proceedings instituted
by third parties before various patent offices or in courts. The degree of future protection for our intellectual property is uncertain. Only limited protection may be available and may not adequately
protect our rights or permit us to gain or keep any competitive advantage. This failure to properly protect the intellectual property rights relating to our products and technologies could have a
material adverse effect on our financial condition and results of operations.

The patent application process is subject to numerous risks and uncertainties, and there can be no assurance that we or any of our future development partners will be successful in protecting our
product candidates by obtaining and defending patents. These risks and uncertainties include the following:

•

The U.S. Patent and Trademark Office and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other provisions
during the patent process. There are situations in which noncompliance can result in abandonment or lapse of a patent or patent application, resulting in partial or complete loss of patent
rights in the relevant jurisdiction. In such an event, competitors might be able to enter the market earlier than would otherwise have been the case.
Patent applications may not result in any patents being issued.
Patents that may be issued may be challenged, invalidated, modified, revoked, circumvented, found to be unenforceable or otherwise may not provide any competitive advantage.

•
•
• Our competitors may seek or may have already obtained patents that will limit, interfere with, or eliminate our ability to make, use and sell our potential product candidates.
• Mainland China and other countries other than the United States may have patent laws less favorable to patentees than those upheld by U.S. courts, allowing foreign competitors a better

opportunity to create, develop and market competing product candidates.

In addition, we rely on the protection of our trade secrets and know-how. Although we have taken steps to protect our trade secrets and unpatented know-how, including entering into confidentiality
and non-disclosure agreements with third parties and confidential information and inventions agreements with key employees, customers and suppliers, other parties may still obtain this information
or may come upon this information independently. If any of these events occurs or if we otherwise lose protection for our trade secrets or proprietary know-how, the value of this information may be
greatly reduced.

We may be involved in lawsuits to protect or enforce our patents, which could be expensive, time consuming and unsuccessful.

Competitors may infringe upon our patents. If our technologies are adopted, we believe that competitors may try to match our technologies and tools in order to compete. To counter infringement or
unauthorized use, we may be required to file infringement claims, which can be expensive and time consuming. An adverse result in any litigation or defense proceedings, including our current
suits, could put one or more of our patents at risk of being invalidated, found to be unenforceable or interpreted narrowly and could put our patent applications at risk of not issuing. Furthermore,
because  of  the  substantial  amount  of  discovery  required  in  connection  with  intellectual  property  litigation,  there  is  a  risk  that  some  of  our  confidential  information  could  be  compromised  by
disclosure during litigation. In addition, any future patent litigation, interference or other administrative proceedings will result in additional expense and distraction of our personnel. Most of

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our competitors are larger than we are and have substantially greater resources, and they therefore are likely to be able to sustain the costs of complex patent litigation longer than we could. An
adverse outcome in such litigation or proceedings may expose us to loss of our proprietary position.

We may not be able to protect our intellectual property rights throughout the world, including mainland China, which could materially, negatively affect our business.

Filing, prosecuting and defending patents on our products or proprietary technologies in all countries throughout the world would be prohibitively expensive, and our intellectual property rights in
some countries outside the United States, including mainland China, can be less extensive than those in the United States. In addition, the laws of some foreign countries do not protect intellectual
property rights to the same extent as federal and state laws in the United States. Consequently, competitors may use our technologies in jurisdictions where we have not obtained patent protection to
develop their own products and may export otherwise infringing products to territories where we have patent protection but enforcement is not as strong as that in the United States. These products
may compete with our products, and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

The significant majority of our intellectual property has been developed in mainland China and is owned by ACM Shanghai. Implementation and enforcement of intellectual property-related laws in
mainland  China  has  historically  been  lacking  due  primarily  to  ambiguities  in  mainland  China  intellectual  property  law.  Accordingly,  protection  of  intellectual  property  and  proprietary  rights  in
mainland China may not be as effective as in the United States or other countries. As a result, third parties could illegally use the technologies and proprietary processes that we have developed and
compete with us, which could negatively affect any competitive advantage we enjoy, dilute our brand and harm our operating results. Litigation may be necessary to enforce our intellectual property
rights, and given the relative unpredictability of mainland China’s legal system and potential difficulties enforcing a court judgment in mainland China, there is no guarantee litigation would result
in an outcome favorable to us.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain
developing countries, do not favor the enforcement of patents and other intellectual property protection, which could make it difficult for us to stop the infringement of our patents or marketing of
competing  products  in  violation  of  our  proprietary  rights  generally.  Proceedings  to  enforce  our  patent  rights  in  foreign  jurisdictions  could  result  in  substantial  costs  and  divert  our  efforts  and
attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing, and could provoke third
parties to assert claims against us. We may not prevail in any lawsuits that we initiate, and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our
efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license and may
adversely affect our business.

If we are sued for infringing intellectual property rights of third parties, it will be costly and time consuming, and an unfavorable outcome in that litigation could have a material adverse effect
on our business.

Our success depends on our ability to develop, manufacture, market and sell our products without infringing upon the proprietary rights of third parties. Numerous U.S. and foreign-issued patents
and  pending  patent  applications  owned  by  third  parties  exist  in  the  fields  in  which  we  are  developing  products,  some  of  which  may  contain  claims  that  overlap  with  the  subject  matter  of  our
intellectual property. A third party has claimed in the past, and others may claim in the future, that our technology or products infringe their intellectual property. In some instances third parties may
initiate litigation against us in an effort to prevent us from using our technology in alleged violation of their intellectual property rights. The risk of such a lawsuit will likely increase as our size and
the number and scope of our products increase and as our geographic presence and market share expand.

Any potential intellectual property claims or litigation commenced against us could:

•
•
•
•
•

be time consuming and expensive to defend, whether or not meritorious;
force us to stop selling products or using technology that allegedly infringes the third party’s intellectual property rights;
delay shipments of our products;
require us to pay damages or settlement fees to the party claiming infringement;
require us to attempt to obtain a license to the relevant intellectual property, which may not be available on reasonable terms or at all;

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•
•

•

force us to attempt to redesign products that contain the allegedly infringing technology, which could be expensive or which we may be unable to do;
require us to indemnify our customers, suppliers or other third parties for any loss caused by their use of our technology that allegedly infringes the third party’s intellectual property rights;
or
divert the attention of our technical and managerial resources.

Because patent applications can take many years to issue, there may be currently pending applications, unknown to us, that may later result in issued patents upon which our products or technologies
may infringe. Similarly, there may be issued patents relevant to our products of which we are not aware.

Breaches of our cybersecurity systems could degrade our ability to conduct our business operations and deliver products to our customers, result in data losses and the theft of our intellectual
property, damage our reputation, and require us to incur significant additional costs to maintain the security of our networks and data.

We increasingly depend upon our information technology systems to conduct our business operations, ranging from our internal operations and product development and manufacturing activities to
our marketing and sales efforts and communications with our customers and business partners. Computer programmers may attempt to penetrate our network security, or that of our website, and
misappropriate our proprietary information or cause interruptions of our service. Because the techniques used by such computer programmers to access or sabotage networks change frequently and
may  not  be  recognized  until  launched  against  a  target,  we  may  be  unable  to  anticipate  these  techniques.  We  have  also  outsourced  a  number  of  our  business  functions  to  third-party  contractors,
including our manufacturers, and our business operations also depend, in part, on the success of our contractors’ own cybersecurity measures. Accordingly, if our cybersecurity systems and those of
our contractors fail to protect against unauthorized access, sophisticated cyberattacks and the mishandling of data by our employees and contractors, our ability to conduct our business effectively
could be damaged in a number of ways, including sensitive data regarding our employees or business, including intellectual property and other proprietary data, could be stolen. Should this occur,
we could be subject to significant claims for liability from our customers and regulatory actions from governmental agencies. In addition, our ability to protect our intellectual property rights could
be compromised and our reputation and competitive position could be significantly harmed. Consequently, our financial performance and results of operations could be adversely affected.

Risks Related to Ownership of Class A Common Stock

The market price of Class A common stock has been and may continue to be volatile, which could result in substantial losses for investors purchasing our shares.

The market price of Class A common stock has been, and could continue to be, subject to significant fluctuations. The market price of Class A common stock may fluctuate significantly in response
to numerous factors, many of which are beyond our control, including:

•
•
•

•

•
•

•
•
•
•
•
•

actual or anticipated fluctuations in our revenue and other operating results;
the financial projections we may provide to the public, any changes in these projections or our failure to meet these projections;
actions  of  securities  analysts  who  initiate  or  maintain  coverage  of  us,  changes  in  financial  estimates  by  any  securities  analysts  who  follow  our  company,  or  our  failure  to  meet  these
estimates or the expectations of investors;
changes in projections for the chips or chip equipment industries or in the operating performance or expectations and stock market valuations of chip companies, chip equipment companies
or technology companies in general;
changes in operating results;
any changes in the financial projections we may provide to the public, our failure to meet these projections, or changes in recommendations by any securities analysts that elect to follow
Class A common stock;
additional shares of Class A common stock being sold into the market by us or our existing stockholders or the anticipation of such sales;
price and volume fluctuations in the overall stock market, including as a result of trends in the economy as a whole;
lawsuits threatened or filed against us;
litigation and other developments relating to our patents or other proprietary rights or those of our competitors;
developments in new legislation and pending lawsuits or regulatory actions, including interim or final rulings by judicial or regulatory bodies; and
general economic trends, including changes in the demand for electronics or information technology or geopolitical events such as war or acts of terrorism, or any responses to such events.

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In recent years, the stock market in general, and Nasdaq in particular, has experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to changes in the
operating performance of the companies whose stock is experiencing those price and volume fluctuations. Further, following periods of volatility in the overall market and the market price of a
particular company’s securities, securities class action litigation has often been instituted against these companies. Similar litigation may be instituted against us in the future, which could result in
substantial costs and a diversion of our management’s attention and resources.

Few if any companies with stock publicly traded in the United States have effected a STAR Market listing of stock of a mainland China-based subsidiary, and it is therefore difficult to predict
the effect of the STAR Listing and STAR IPO on the Class A common stock.

The China Securities Regulatory Commission initially launched the STAR Market in June 2019 and trading on the Market began in July 2019. In November 2021 ACM Shanghai completed the
STAR Listing and the STAR IPO. We believe we are one of the first publicly traded U.S. companies to complete an initial public offering of shares of a mainland China subsidiary on the STAR
Market. As a result, no assurance can be given regarding the effect of the STAR Listing and the STAR IPO on the market price of the Class A common stock. The market price of Class A common
stock may be volatile or may decline, for reasons other than the risk and uncertainties described above, as the result of investor negativity or uncertainty with respect to the impact of the STAR
Listing and STAR IPO.

ACM Research stockholders were not entitled to purchase ACM Shanghai shares in the pre-STAR Listing placement, and they may have limited opportunities to purchase ACM Shanghai shares
now that the STAR Listing and the STAR IPO have been completed. Investors may elect to invest in our business and operations by purchasing ACM Shanghai shares on the STAR Market rather
than purchasing ACM Research Class A common stock, and that reduction in demand could lead to a decrease in the market price for the Class A common stock.

If securities or industry analysts do not publish research or reports about us, our business or our market, or if they publish negative evaluations of Class A common stock or the stock of other
companies in our industry, the price of our stock and trading volume could decline.

The trading market for Class A common stock will depend in part on the research and reports that securities or industry analysts publish about us or our business. If one or more of the analysts who
cover us downgrade the Class A common stock or publish inaccurate or unfavorable research about our business, the Class A common stock price would likely decline. In addition, if one or more of
these analysts ceases coverage of the Class A common stock or fails to publish reports about the Class A common stock on a regular basis, we could lose visibility in the financial markets, which in
turn could cause the Class A common stock price or trading volume to decline.

We have never paid and do not intend to pay cash dividends and, consequently, your ability to achieve a return on your investment will depend on appreciation in the price of Class A common
stock.

We have never declared or paid cash dividends on our capital stock. We intend to retain any future earnings to finance the operation and expansion of our business, and we do not expect to declare or
pay any dividends in the foreseeable future. Accordingly, you may only receive a return on your investment in Class A common stock if the market price of Class A common stock increases.

Our ability to pay dividends on Class A common stock depends significantly on our receiving distributions of funds from our subsidiaries in mainland China. mainland China statutory laws and
regulations permit payments of dividends by those subsidiaries only out of their retained earnings, which are determined in accordance with mainland China accounting standards and regulations
that differ from U.S. generally accepted accounting principles. Mainland China regulations and our subsidiaries’ articles of association require annual appropriations of 10% of net after-tax profits to
be set aside, prior to payment of dividends, as a reserve or surplus fund, which restricts our subsidiaries’ ability to transfer a portion of their net assets to us. In addition, our subsidiaries’ short-term
bank loans restrict their ability to pay dividends to us.

The dual class structure of common stock has the effect of concentrating voting control with our executive officers and directors, including our Chief Executive Officer and President, which
will limit or preclude your ability to influence corporate matters.

Class B common stock has twenty votes per share and Class A common stock has one vote per share. As of February 23, 2024, stockholders who hold shares of Class B common stock, who consist
principally of our executive officers,

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employees, directors and their respective affiliates, collectively held 64.2% of the voting power of our outstanding capital stock. Because of the twenty-to-one voting ratio between Class B and Class
A common stock, holders of Class B common stock collectively will continue to control a majority of the combined voting power of Class A common stock and therefore be able to control all
matters submitted to our stockholders for approval so long as the shares of Class B common stock represent at least 4.8% of all outstanding shares of Class A and Class B common stock. This
concentrated control will limit or preclude your ability to influence corporate matters for the foreseeable future. This concentrated control could also discourage a potential investor from acquiring
Class A common stock due to the limited voting power of such stock relative to the Class B common stock and might harm the market price of Class A common stock.

Because of the market capitalization achieved by Class A common stock during October 2020, our charter no longer contemplates circumstances in which all of the shares of Class B common stock
will mandatorily convert into Class A common stock. Instead, all of the Class B common stock generally will convert into Class A common stock only upon the election of the holders of a majority
of the then-outstanding shares of Class B common stock, and specific shares of Class B common stock will convert into Class A common stock upon future transfers by the holders of those shares.
The potential conversion of Class B common stock to Class A common stock will have the effect, over time, of increasing the relative voting power of those holders of Class B common stock who
retain their shares in the long term.

Delaware law and provisions in our charter and bylaws could make a merger, tender offer or proxy contest difficult, thereby depressing the trading price of Class A common stock.

Our  status  as  a  Delaware  corporation  and  the  anti-takeover  provisions  of  the  Delaware  General  Corporation  Law  may  discourage,  delay,  or  prevent  a  change  in  control  by  prohibiting  us  from
engaging in a business combination with an interested stockholder for a period of three years after the person becomes an interested stockholder, even if a change of control would be beneficial to
our existing stockholders. Our charter and bylaws contain provisions that may make the acquisition of our company more difficult, including the following:

•

our  dual  class  common  stock  structure  provides  holders  of  Class  B  common  stock  with  the  ability  to  control  the  outcome  of  matters  requiring  stockholder  approval,  even  if  they  own
significantly less than a majority of the total number of outstanding shares of Class A and Class B common stock;

• when the outstanding shares of Class B common stock represent less than a majority of the combined voting power of common stock;
•
•
•
•
•
•
•
•
•

amendments to our charter or bylaws will require the approval of two-thirds of the combined vote of our then-outstanding shares of Class A and Class B common stock;
vacancies on the board of directors will be able to be filled only by the board and not by stockholders;
the board, which currently is not staggered, will be automatically separated into three classes with staggered three-year terms;
directors will only be able to be removed from office for cause; and
our stockholders will only be able to take action at a meeting and not by written consent;
only our chair, our chief executive officer or a majority of our directors is authorized to call a special meeting of stockholders;
advance notice procedures apply for stockholders to nominate candidates for election as directors or to bring matters before an annual meeting of stockholders;
our charter authorizes undesignated preferred stock, the terms of which may be established, and shares of which may be issued, without stockholder approval; and
cumulative voting in the election of directors is prohibited.

As a Delaware corporation, we are also subject to provisions of Delaware law, including Section 203 of the Delaware General Corporation Law, which limits the ability of stockholders holding more
than 15% of our outstanding voting stock from engaging in certain business combinations with us. Any provision of our charter or bylaws or Delaware law that has the effect of delaying or deterring
a change in control could limit the opportunity for our stockholders to receive a premium for their shares of Class A common stock, and could also affect the price that some investors are willing to
pay for Class A common stock.

Our charter designates the Court of Chancery of the State of Delaware as the sole and exclusive forum for certain litigation that may be initiated by our stockholders, which could limit our
stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers or stockholders.

Our charter provides that the Court of Chancery of the State of Delaware will, to the fullest extent permitted by law, be the sole and exclusive forum for:

•

any derivative action or proceeding brought on our behalf;

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•

•

•

any  action  asserting  a  claim  of  breach  of  a  fiduciary  duty  owed  to  us,  our  stockholders,  creditors  or  other  constituents  by  any  of  our  directors,  officers,  other  employees,  agents  or
stockholders;
any action asserting a claim arising under the Delaware General Corporation Law, our charter or bylaws, or as to which the Delaware General Corporation Law confers jurisdiction on the
Court of Chancery of the State of Delaware; or
any action asserting a claim that is governed by the internal affairs doctrine.

By becoming a stockholder in our company, you will be deemed to have notice of and have consented to the provisions of our charter related to choice of forum. The choice of forum provision in
our  charter  may  limit  our  stockholders’  ability  to  obtain  a  favorable  judicial  forum  for  disputes  with  us  or  any  of  our  directors,  officers,  other  employees,  agents  or  stockholders,  which  may
discourage lawsuits with respect to such claims. Alternatively, if a court were to find the choice of forum provision contained in our charter to be inapplicable or unenforceable in an action, we may
incur additional costs associated with resolving such action in other jurisdictions, which could harm our business, results of operations and financial condition.

We  incur  increased  costs  and  demands  upon  management  as  a  result  of  complying  with  the  laws  and  regulations  affecting  public  companies  which  could  adversely  affect  our  business,
operating results and financial condition.

As a public company, we will continue to incur significant legal, accounting and other expenses. We are subject to the reporting requirements of the Securities and Exchange Act, the Sarbanes-
Oxley Act, the Dodd-Frank Wall Street Reform and Consumer Protection Act, and the rules and regulations of Nasdaq. These requirements have increased and will continue to increase our legal,
accounting and financial compliance costs and have made and will continue to make some activities more time consuming and costly. For example, we expect these rules and regulations to make it
more difficult and more expensive for us to obtain director and officer liability insurance, and we may be required to accept reduced policy limits and coverage or incur substantially higher costs to
maintain the same or similar coverage. As a result, it may be more difficult for us to attract and retain qualified individuals to serve as our executive officers or on the board of directors, particularly
to serve on the audit and compensation committees.

The Sarbanes-Oxley Act requires, among other things, that we assess the effectiveness of our internal control over financial reporting annually and the effectiveness of our disclosure controls and
procedures quarterly. In particular, Section 404 of the Sarbanes-Oxley Act, or Section 404, requires our management to perform system and process evaluation and testing to allow it to report on the
effectiveness of our internal control over financial reporting.

Investor perceptions of our company may suffer if deficiencies are found, which could cause a decline in the market price of our stock. Irrespective of compliance with Section 404, any failure of
our internal control over financial reporting could have a material adverse effect on our stated operating results and harm our reputation. If we are unable to implement these requirements effectively
or efficiently, it could harm our operations, financial reporting, or financial results and could result in an adverse opinion on our internal controls from our independent registered public accounting
firm.

In addition, changing laws, regulations and standards relating to corporate governance and public disclosure are creating uncertainty for public companies, increasing legal and financial compliance
costs and making some activities more time consuming. These laws, regulations and standards are subject to varying interpretations, in many cases due to their lack of specificity, and, as a result,
their application in practice may evolve over time as new guidance is provided by regulatory and governing bodies. This could result in continuing uncertainty regarding compliance matters and
higher costs necessitated by ongoing revisions to disclosure and governance practices. We invest resources to comply with evolving laws, regulations and standards, and this investment may result
in increased general and administrative expense and a diversion of management’s time and attention from revenue-generating activities to compliance activities. If our efforts to comply with new
laws, regulations and standards differ from the activities intended by regulatory or governing bodies, regulatory authorities may initiate legal proceedings against us and our business may be harmed.

Short sellers of our stock may be manipulative and may drive down the market price of our Class A common stock.

Short selling is the practice of selling securities that a seller does not own but rather has borrowed, or intends to borrow, from a third party with the intention of buying identical securities at a later
date to return to the lender. A short seller hopes to profit from a decline in the value of the securities between the sale of the borrowed securities and the purchase of the replacement shares, as the
short seller expects to pay less in that purchase than it received in the sale. As it is in the short seller’s interest for the price of the stock to decline, some short sellers publish, or arrange for the
publication of, opinions or characterizations regarding the relevant issuer, its business prospects and similar matters calculated to or which may create

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negative market momentum, which may permit them to obtain profits for themselves as a result of selling the securities short. The use of the Internet, social media, and blogging have allowed short
sellers  to  publicly  attack  a  company’s  credibility,  strategy  and  veracity  by  means  of  so-called  “research  reports”  that  mimic  the  type  of  investment  analysis  performed  by  legitimate  securities
research analysts. Issuers with limited trading volumes or substantial retail stockholder bases can be particularly susceptible to higher volatility levels, and can be particularly vulnerable to such
short attacks.

Short seller publications are not regulated by any governmental or self-regulatory organization or any other official authority in the United States and are not subject to the certification requirements
imposed by the SEC in Regulation Analyst Certification. Accordingly, the opinions they express may be based on distortions of actual facts or, in some cases, outright fabrications. In light of the
limited risks involved in publishing such information, and the significant profits that can be made from running successful short attacks, short sellers will likely continue to issue such reports. Short-
seller  publications  may  create  the  appearance  or  perception  of  wrongdoing,  even  when  they  are  not  substantiated,  and  may  therefore  affect  the  reputation  or  perception  of  our  company  and
management.

While we intend to strongly defend our public filings against any such short seller attacks, in many situations we could be constrained, for example, by principles of freedom of speech, applicable
state law or issues of commercial confidentiality, in the manner in which we are able to proceed against the relevant short seller.

Such short-seller attacks have caused, and may cause in the future, temporary or possibly long term, declines in the market price of Class A common stock and possible litigation initiated against us.

General

Our production facilities could be damaged or disrupted by a natural disaster, war, terrorist attacks or other catastrophic events.

Our  manufacturing  facilities  are  subject  to  risks  associated  with  natural  disasters,  such  as  earthquakes,  fires,  floods  tsunami,  typhoons  and  volcanic  activity,  environmental  disasters,  health
epidemics, and other events beyond our control such as power loss, telecommunications failures, and uncertainties arising out of armed conflicts or terrorist attacks. The frequency and intensity of
severe  weather  events  are  reportedly  increasing  throughout  the  world  as  part  of  broader  climate  changes.  Global  weather  pattern  changes  may  pose  long-term  risks  of  physical  impacts  to  our
business. A substantial majority of our facilities as well as our research and development personnel are located in mainland China. Any catastrophic loss or significant damage to any of our facilities
would likely disrupt our operations, delay production, and adversely affect our product development schedules, shipments and revenue. In addition, any such catastrophic loss or significant damage
could result in significant expense to repair or replace the facility and could significantly curtail our research and development efforts in a particular product area or primary market, which could
have a material adverse effect on our operations and operating results.

Item 1B.    Unresolved Staff Comments

None.

Item 1C.    Cybersecurity

Cybersecurity Risk Management and Strategy

We recognize the importance of assessing, identifying, and managing material risks associated with cybersecurity threats, as such term is defined in Item 106(a) of Regulation S-K. These risks
include, among other things: operational risks, intellectual property theft, fraud, extortion, harm to employees or customers and violation of data privacy or security laws.
Identifying and assessing cybersecurity risk is integrated into our overall risk management systems and processes.

Cybersecurity risks related to our business, technical operations, privacy and compliance issues are identified and addressed through a multi-faceted approach including third party assessments,
internal  IT  Audit,  IT  security,  governance,  risk  and  compliance  reviews.  To  defend,  detect  and  respond  to  cybersecurity  incidents,  we,  among  other  things:  conduct  proactive  privacy  and
cybersecurity  reviews  of  systems  and  applications,  audit  applicable  data  policies,  perform  penetration  testing  using  external  third-party  tools  and  techniques  to  test  security  controls,  conduct
employee training, monitor emerging laws and regulations related to data protection and information security and implement appropriate changes.

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As part of our risk management process, we conduct application security assessments, vulnerability management, penetration testing, security audits, and ongoing risk assessments. We also maintain
a variety of incident response plans that are utilized when incidents are detected. We require employees with access to information systems, including all corporate employees, to undertake data
protection and cybersecurity training and compliance programs.

We  describe  whether  and  how  risks  from  cybersecurity  threats  are  reasonably  likely  to  materially  affect  us,  including  our  financial  performance  and  results  of  operations,  under  the  heading
“Breaches of our cybersecurity systems could degrade our ability to conduct our business operations and deliver products to our customers, result in data losses and the theft of our intellectual
property, damage our reputation, and require us to incur significant additional costs to maintain the security of our networks and data” in Item 1A, “Risk Factors” of Part I of this report.

Cybersecurity Governance

Cybersecurity is an important part of our risk management processes. Our Audit Committee is responsible for the oversight of risks from cybersecurity threats. Members of the Audit Committee
receive reports of any breaches or developments regarding matters of cybersecurity. This includes existing and new cybersecurity risks, status on how management is addressing and/or mitigating
those risks, cybersecurity and data privacy incidents (if any) and status on key information security initiatives. Our Audit Committee and Board members may also engage in ad hoc conversations
with management on cybersecurity-related news events and discuss any updates to our cybersecurity risk management and strategy programs.

Our cybersecurity risk management and strategy processes are overseen by leaders from our Information Security, Product Security, Compliance and Legal teams. Key individuals have an average
of over 15 years of prior work experience in various roles involving information technology, including security, auditing, compliance, systems and programming. These individuals are informed
about,  and  monitor  the  prevention,  mitigation,  detection  and  remediation  of  cybersecurity  incidents  through  their  management  of,  and  participation  in,  the  cybersecurity  risk  management  and
strategy processes described above, including the operation of our incident response plan, and report directly or indirectly to the Audit Committee on any appropriate items.

Item 2. Properties

We have occupied our current corporate headquarters in Fremont, California, since February 2008, under a lease that, after an amendment in February 2023, now extends through March 31, 2025.

We conduct research and development, service support operations and administrative activities at ACM Shanghai’s headquarters located in the Zhangjiang Hi Tech Park in Shanghai. We have leased
this facility since 2007 and our lease currently extends until December 31, 2024. In the year ended December 31, 2023, ACM Shanghai completed its purchase of facilities in the ZhangJiang free
trade zone, part of the Pudong district of Shanghai. The facilities consist of four buildings for administrative and R&D office use, and, following the expected move-in in the 2024 timeframe, are
intended to serve as the corporate headquarters for ACM Shanghai.

In January 2018, ACM Shanghai entered into an operating lease for a second manufacturing space located in Shanghai, ten miles from its headquarters. The lease covers a total of 103,318 square
feet, of which 100,000 square feet are allocated for production. Our lease currently extends until January 15, 2028. In February 2021, ACM Shanghai entered into an operating lease for a second
building located adjacent to the above-mentioned second manufacturing space to provide additional manufacturing space. The lease covers approximately 106,076 square feet of which 100,000
square  feet  are  allocated  for  production.  Our  lease  currently  extends  until  July  15,  2024.  In  July  2022,  ACM  Shanghai  entered  into  an  operating  lease  for  a  third  building  to  provide  additional
manufacturing and warehousing space.

In addition, we perform sales support, customer service operations, R&D, and production activities from leased facilities in Jiangyin and Wuxi in mainland China and Icheon in Korea.

In May 2020 ACM Shanghai, through its wholly owned subsidiary ACM Shengwei, entered into an agreement for a 50-year land use right in the Lingang region of Shanghai. In July 2020 ACM
Shengwei began a multi-year construction project for a new development and production center. The planned 1,000,000 square foot facility will incorporate state-of-the-art manufacturing systems
and automation technologies and will provide the floor space to support significantly more production capacity and related research and development activities when fully staffed and supplied.

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In connection with the Lingang facility project, on October 28, 2020, a wholly owned subsidiary of ACM Shengwei entered into Shanghai Public Rental Housing Overall Pre-Sale Contracts with
Shanghai Lingang Industrial Zone Public Rental Housing Construction and Operation Management Co., Ltd. for an aggregate price to us of approximately $40 million. ACM Shengwei’s subsidiary
received ownership of the apartment units and corresponding land use rights in January 2022 as part of a pilot project of public rental housing in the “rent before sale” park in the Lingang Industrial
Zone.  The  contracts  stipulate  that,  for  a  ten-year  term,  ACM  Shengwei’s  subsidiary  is  obligated  to  manage  the  apartment  units  for  public  rental  use  in  accordance  with  public  rental  housing
standards and must rent the apartment units to employees of ACM Shanghai and its subsidiaries who work in the Lingang Industrial Zone. After that ten-year period expires, ACM Shengwei’s
subsidiary may use the apartment units as stock of commercial housing and may sell them separately in sets.

Effective April 1, 2023, we entered an agreement to lease a 10,683 square foot facility in Hillsborough, Oregon beginning April 1, 2023 until August 31, 2030. The facility is being used for our
U.S.-based sales and services team to support customer activities in the region.

Item 3.    Legal Proceedings

From time to time we may become involved in legal proceedings or may be subject to claims arising in the ordinary course of our business. Although the results of these proceedings and claims
cannot be predicted with certainty, we currently believe that the final outcome of these ordinary course matters will not have a material adverse effect on our business, operating results, financial
condition or cash flows. Regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources and other factors. As of
December 31, 2023, the Company had no outstanding material legal proceedings, other than ordinary routine litigation incidental to the business.

Item 4.    Mine Safety Disclosures

Not applicable.

PART II

Item 5.     Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Information Regarding the Trading of Common Stock

The Class A common stock has traded on NASDAQ Global Market under the symbol “ACMR” since November 3, 2017. The Class B common stock is not listed or traded on any stock exchange.

Holders of Common Stock

As  of  February  23,  2024,  there  were  56,073,205  shares  of  Class  A  common  stock  outstanding  held  of  record  by  46  stockholders.  The  actual  number  of  holders  of  Class  A  common  stock  is
substantially greater and includes stockholders who are beneficial owners and whose shares are held of record by banks, brokers, and other financial institutions.

As of February 23, 2024, there were 5,021,811 shares of Class B common stock held of record by 16 stockholders.

We  have  never  declared  or  paid  cash  dividends  on  our  capital  stock.  We  intend  to  retain  all  available  funds  and  any  future  earnings  to  support  the  operation  of  and  to  finance  the  growth  and
development of our business and do not anticipate paying any cash dividends in the foreseeable future.

Securities Authorized for Issuance Under Equity Compensation Plans

The information required by this item will be set forth in the definitive proxy statement we will file in connection with our 2024 Annual Meeting of Stockholders and is incorporated by reference
herein.

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Sales of Unregistered Securities

During the three months ended December 31, 2023, ACM Research issued, pursuant to the exercise of stock options at a per share exercise price of $0.50 per share, an aggregate of 235,581 shares
of Class A common stock that were not registered under the Securities Act of 1933. We believe the offer and sale of those shares were exempt from registration under the Securities Act of 1933 by
virtue of Section 4(a)(2) thereof (or Regulation D promulgated thereunder) because they did not involve a public offering. The recipients of the shares acquired the securities for investment only and
not with a view to or for sale in connection with any distribution thereof, and appropriate legends were recorded with respect to the shares. The recipients of the shares were accredited investors
under Rule 501 of Regulation D.

Sale Date

November 3, 2023
November 14, 2023
November 14, 2023

Total

Exercised 
Shares (Net)

26,821
174,776
33,984

235,581

Performance Graph

The following graph compares the total return of an investment of $100 in cash at the closing price of November 3, 2017, which is the date our common stock first began trading on Nasdaq, through
December  31,  2023  for  (1)  our  common  stock,  (2)  the  Russell  1000  index,  and  (3)  the  Nasdaq  Composite  Index.  All  values  assume  reinvestment  of  all  dividends.  Stockholder  returns  over  the
indicated period are based on historical data and are not necessarily indicative of future stockholder returns.

COMPARISON OF 5 YEAR CUMULATIVE TOTAL RETURN
Among ACM Research, Inc., the Nasdaq Index, and the Russell 1000 Index

Item 6.    [Reserved]

Item 7.    Management’s Discussion and Analysis of Financial Condition and Results of Operations

The  following  discussion  and  analysis  should  be  read  in  conjunction  with  the  audited  consolidated  financial  statements  and  related  notes  included  in  this  report.  In  addition  to  historical
information, the following discussion contains forward-looking statements that involves risks, uncertainties and assumptions. See “Forward-Looking Statements and Statistical Data” at page 3 of
this report. Please read “Item 1A. Risk Factors” for a discussion of factors that could cause our actual results to differ materially from our expectations

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Overview

ACM  Research  was  incorporated  in  California  in  1998  and  redomesticated  in  Delaware  in  2016.  We  perform  strategic  planning,  marketing,  and  financial  activities  at  our  global  corporate
headquarters in Fremont, California. ACM Research is neither a mainland China operating company nor do we conduct our operations in mainland China through the use of VIEs.

We supply advanced, innovative capital equipment developed for the global semiconductor industry. Fabricators of advanced integrated circuits, or chips, can use our wet-cleaning and other front-
end processing tools in numerous steps to improve product yield, even at increasingly advanced process nodes. We have designed these tools for use in fabricating foundry, logic and memory chips,
including DRAM 3D NAND-flash memory chips, power semiconductor and compound semiconductor chips. We also develop, manufacture and sell a range of advanced packaging tools to wafer
assembly and packaging customers.

We are focused on building a strategic portfolio of intellectual property to support and protect our key innovations. Our tools have been developed using our key proprietary technologies:
•
•
•

SAPS technology for flat and patterned wafer surfaces, which employs alternating phases of megasonic waves to deliver megasonic energy in a highly uniform manner on a microscopic level;
TEBO technology for patterned wafer surfaces at advanced process nodes, which provides effective, damage-free cleaning for 2D and 3D patterned wafers with fine feature sizes;
Tahoe technology for cost and environmental savings, which delivers high cleaning performance using significantly less sulfuric acid and hydrogen peroxide than is typically consumed by
conventional high-temperature single-wafer cleaning tools; and
ECP technology for advanced metal plating, which includes Ultra ECP ap, or Advanced Packaging, technology for back-end assembly processes, Ultra ECP 3d for through-silicon-via, or tsv,
and Ultra ECP map, or Multi-Anode Partial Plating, technology for front-end wafer fabrication processes.

•

In 2021, 2022 and 2023 we introduced and delivered a range of new tools intended to broaden our revenue opportunity with global semiconductor manufacturers. Product extensions include the
Ultra SFP ap tool for advanced packaging solutions, the Ultra C VI 18-chamber single wafer cleaning tool for advanced memory devices, and the Ultra ECP 3d platform for through-silicon-via, or
tsv, application. New product lines include the Ultra fn Furnace, our first dry processing tool, and a suite of semi-critical cleaning systems which include single wafer back side cleaning, scrubber,
and auto bench cleaning tools.

We added two major new product categories in 2022 with the launch of the Ultra Pmax™ PECVD tool, which is equipped with a proprietary designed chamber, gas distribution unit and chuck, and
is intended to provide better film uniformity, reduced film stress, and improved particle performance, and the introduction of the Ultra Track tool, a 300mm process tool that delivers uniform air
downflow, fast robot handling and customizable software to address specific customer requirements, and has multiple features that enhance performance across defectivity, throughput, and cost of
ownership.

We conduct a substantial majority of our product development, manufacturing, support and services in mainland China, with additional product development and subsystem production in Korea.
Substantially all of our integrated tools are built to order at our manufacturing facilities in the Pudong region of Shanghai, which now encompass a total of 236,000 square feet of floor space for
production capacity, with 100,000 square feet having been added in 2021 with the lease of a second building in the Pudong region of Shanghai. In May 2020 ACM Shanghai, through its wholly
owned subsidiary ACM Shengwei, entered into an agreement for a land use right in the Lingang region of Shanghai. In 2020 ACM Shengwei began a multi-year construction project for a new
1,000,000  square  foot  development  and  production  center  that  will  incorporate  state-of-the-art  manufacturing  systems  and  automation  technologies  and  will  provide  floor  space  to  support
significantly increased production capacity and related R&D activities. We expect to complete construction of the first Lingang manufacturing building and commence initial production in the first
half of 2024 timeframe. See “Item 2. Properties” of Part I of this report.

Our experience has shown that chip manufacturers in mainland China and throughout Asia demand equipment meeting their specific technical requirements and prefer building relationships with
local suppliers. We will continue to seek to leverage our local presence to address the growing market for semiconductor manufacturing equipment in the region by working closely with regional
chip  manufacturers  to  understand  their  specific  requirements,  encourage  them  to  adopt  our  SAPS,  TEBO,  Tahoe,  ECP,  furnace,  PECVD,  Track,  and  other  technologies,  and  enable  us  to  design
innovative products and solutions to address their needs.

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Our Independent Registered Public Accounting Firm

The U.S. Holding Foreign Companies Accountable Act, or the HFCA Act, requires that the Public Company Accounting Oversight Board, or the PCAOB, determine whether it is unable to inspect
or investigate completely registered public accounting firms located in a non-U.S. jurisdiction because of a position taken by one or more authorities in any non-U.S. jurisdiction. BDO China Shu
Lun Pan Certified Public Accountants LLP, or BDO China, had been our independent registered public accounting firm in recent years, including for the year ended December 31, 2021. On June 22,
2021, the U.S. Senate passed the Accelerating Holding Foreign Companies Accountable Act, which was enacted on December 29, 2022 under the Consolidated Appropriations Act, 2023, as further
described below. On December 16, 2021, the PCAOB reported its determination that it was unable to inspect or investigate completely registered public accounting firms headquartered in mainland
China and Hong Kong, including BDO China, because of positions taken by mainland China authorities in those jurisdictions. On March 30, 2022, based on this determination, ACM Research was
transferred to the SEC’s “Conclusive list of issuers identified under the HFCAA.” See “Item 1A. Risk Factors—Risks Related to International Aspects of Our Business—We could be adversely
affected  if  we  are  unable  to  comply  with  recent  and  proposed  legislation  and  regulations  regarding  improved  access  to  audit  and  other  information  and  audit  inspections  of  accounting  firms
operating in mainland China” of this report for more information. Under current regulations, if ACM Research were to be included on this list for two consecutive years due to our independent
auditor being located in a jurisdiction that does not allow for PCAOB inspections, the SEC would prohibit trading in our securities and this ultimately could cause our securities to be delisted in the
U.S., and their value may significantly decline or become worthless.

On December 15, 2022, the PCAOB announced that it was able to secure complete access to inspect and investigate PCAOB-registered public accounting firms headquartered in mainland China
and Hong Kong in 2022 and vacated its previous December 16, 2021 determination to the contrary. However, whether the PCAOB will continue to be able to satisfactorily conduct inspections of
PCAOB-registered public accounting firms headquartered in mainland China and Hong Kong is subject to uncertainty and depends on a number of factors out of our, and our auditor’s, control.
mainland China authorities will need to ensure that the PCAOB continues to have full access for inspections and investigations in 2023 and beyond. Each year, the PCAOB will determine whether it
can inspect and investigate completely audit firms in mainland China and Hong Kong, among other jurisdictions. If the mainland China authorities do not allow the PCAOB complete access for
inspections  and  investigations  for  two  consecutive  years,  the  SEC  would  prohibit  trading  in  the  securities  of  issuers  engaging  those  audit  firms,  as  required  under  the  HFCA  Act.  Further,  on
December  29,  2022,  the  Consolidated  Appropriations  Act,  2023,  was  signed  into  law  by  U.S.  President  Biden,  which,  among  other  things,  amended  the  HFCA  Act  to  reduce  the  number  of
consecutive non-inspection years that would trigger the trading prohibition under the HFCA Act from three years to two years (originally such threshold under the HFCA Act was three consecutive
years), and so that any foreign jurisdiction could be the reason why the PCAOB does not have complete access to inspect or investigate a company’s public accounting firm (originally the HFCA
Act only applied if the PCAOB’s ability to inspect or investigate was due to a position taken by an authority in the jurisdiction where the relevant public accounting firm was located).

On  June  30,  2022,  and  June  15,  2023,  stockholders  of  ACM  Research  ratified  the  appointment  of  Armanino  as  our  independent  auditor  for  the  years  ended  December  31,  2022  and  2023,
respectively. Armanino was neither headquartered in mainland China or Hong Kong nor was it subject to the determinations announced by the PCAOB on December 16, 2021, which determinations
were vacated by the PCAOB on December 15, 2022. On July 21, 2023, we were informed by Armanino, that Armanino would resign as our independent auditor effective as of the earlier of (a) the
date we engaged a new independent registered public accounting firm or (b) the filing of our Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2023.

On September 14, 2023, the Audit Committee completed a competitive selection process to select and appoint a new accounting firm to serve as our independent registered public accounting firm
commencing with the audit of our financial statements for the fiscal year ended December 31, 2023. As a result of this process, the Audit Committee approved the engagement of E&Y as our
independent registered public accounting firm for the fiscal year ended December 31, 2023. The engagement of E&Y became effective on September 20, 2023. E&Y is a PCAOB-registered firm
that is headquartered in mainland China; however, we do not believe ACM Research will appear on the “Conclusive list of issuers identified under the HFCAA” for a second consecutive time, as the
determinations announced by the PCAOB on December 16, 2021 were vacated by the PCAOB on December 15, 2022.

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STAR Listing and IPO

On November 18, 2021, ACM’s operating subsidiary ACM Shanghai completed:

•
•

a listing, which we refer to as the STAR Listing, of shares of ACM Shanghai on the Shanghai Stock Exchange’s SciTech innovAtion boaRd, known as the STAR Market; and
a concurrent initial public offering, which we refer to as the STAR IPO, of ACM Shanghai shares in mainland China, at a pre-offering valuation of not less than RMB 5.15 billion ($747.1
million).

Following the completion of the STAR IPO, ACM Shanghai’s shares began trading on the STAR Market under the stock code 688082. In the STAR IPO, ACM Shanghai issued 43,355,753 shares,
representing ten percent of the total 433,557,100 shares outstanding after the STAR IPO. The shares were issued at a public offering price of RMB 85.00 per share, and the proceeds of the STAR
IPO totaled approximately $545.5 million, net of fees and expenses. Upon completion of the STAR IPO, ACM owned approximately 82.5% of the outstanding ACM Shanghai shares. However, in
May 2023, ACM's ownership declined to 82.1% due to the exercise of 2,150,309 stock options related to ACM Shanghai shares (note 18).

We believe the STAR Listing will continue to help scale our business in mainland China, and we continue to seek to broaden our markets in Europe, Japan, Korea, Taiwan and the United States. Our
global headquarters are located in Fremont, California, and we are committed to maintaining the listing of Class A common stock on the Nasdaq Global Market.

ACM Shanghai Dividend

During year ended December 31, 2023, ACM Shanghai paid a dividend to the stockholders of ACM Shanghai (including ACM Research) in the amount of RMB 0.372 per share for an aggregate
total of RMB 161.28 million ($22.2 million).

Restrictions Imposed by the U.S. Department of Commerce on mainland China-Based Semiconductor Producers

In early October 2022 the U.S. government enacted new rules aimed at restricting U.S. support for mainland China’s ability to manufacture advanced semiconductors. The rules included new export
license requirements for exports, re-exports or transfers to or within mainland China of additional types of semiconductor manufacturing items, items for use in manufacturing designated types of
semiconductor  manufacturing  equipment  in  mainland  China,  and  semiconductor  manufacturing  equipment  for  use  at  certain  IC  manufacturing  and  development  facilities  in  mainland  China.  In
addition,  the  U.S.  government  imposed  new  restrictions  by  which  U.S.  persons  anywhere  in  the  world  are  effectively  barred  from  engaging  in  certain  activities  related  to  the  development  and
production of certain semiconductors at mainland China fabrication facilities meeting specified criteria, even if no items subject to the U.S. Export Administration Regulations (EAR) are involved.
These restrictions were later updated to extend to Macau.

In October 2023, the U.S. government revised and expanded the October 2022 controls with the release of additional rules. While the release primarily clarified the October 2022 regulations, certain
changes have the potential to be more significant. In particular, the U.S. government expanded license requirements on additional types of semiconductors, semiconductor manufacturing items, and
items for use in manufacturing certain types of semiconductor manufacturing equipment, and also expanded the scope to include additional countries beyond mainland China and Macau.

ACM Shanghai has determined that several of its customers have mainland China-based facilities that meet the restricted criteria set out in the October 2022 and October 2023 rules, and has also
determined that several of its products, and/or components for its products, may meet the parameters of export control classification numbers, or ECCNs, affected by the restrictions. ACM and ACM
Shanghai have implemented modifications to their existing business policies and practices in response to the October 2022 restrictions, including by imposing limitations on the activities of their
U.S. persons and undertaking measures in connection with their supply chains more broadly to comply with the new regulations. ACM Shanghai is continuing to assess the impact of the October
2023 changes, together with the October 2022 rules, and will continually adjust or modify its policies and practices as required to comply with these or other related updates. Based on our ongoing
review, we believe these regulations may directly impact ACM Shanghai’s ability to meet its future production plans, or indirectly impact the spending plans of ACM Shanghai’s customer base.
ACM may not be able to import, or may face substantial restrictions in importing, certain parts from the United States or parts subject to U.S. export controls from outside the United States to
support tool shipments to such facilities, or to be embedded into tools defined by affected ECCNs.

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ACM and ACM Shanghai believe that as a result of the October 2022 and October 2023 restrictions, several ACM Shanghai customers have significantly reduced production and related capital
spending at facilities meeting the restricted advanced node capabilities. In addition, ACM Shanghai has experienced challenges as the companies in its supply chain adapt their policies to the new
regulations. These factors had an adverse impact on ACM Shanghai’s shipments and sales for the twelve months ended December 30, 2023.

During the twelve months ended December 30, 2023, two prominent exporters of advanced semiconductor manufacturing equipment, the Netherlands and Japan, announced and began to implement
plans to join the United States in imposing semiconductor-focused export controls.

On  May  23,  2023,  the  Japanese  government  issued  the  final  amendment  to  an  ordinance  implementing  new  export  controls  to  require  licensing  for  export  of  certain  advanced  semiconductor
manufacturing  equipment,  effective  as  of  July  23,  2023. The  amendment  expands  the  scope  of  export  controls  to  prohibit  (1)  exporting  twenty-three  additional  categories  of  items  relating  to
semiconductor  manufacturing  and  (2)  providing  technology  relating  to  manufacturing,  development  or  use  of  these  categories  of  items,  in  both  cases,  without  an  advance  license.  While  the
expanded export controls apply to exports to any jurisdiction, exports to certain jurisdictions, such as the United States, are expected to be permitted by certain types of broad general licenses.
However, it remains to be seen whether the Japanese government will authorize any exports of these items to mainland China by a limited general license or specific license, if at all.

On  June  30,  2023,  the  Government  of  the  Netherlands  published  additional  export  control  measures  for  advanced  semiconductor  manufacturing  equipment.  The  Regulation  on  Advanced
Semiconductor Manufacturing Equipment took effect on September 1, 2023. From that point on, the export of certain advanced semiconductor manufacturing equipment, as specified in the Annex
to the Regulation, has been subject to a national export license authorization requirement by the Dutch Central Import and Export Service.

As a result of the new restrictions imposed by the Japanese and Dutch governments, ACM Shanghai and/or several of its customers in mainland China may be impacted by, and required to reduce
their production capabilities due to, the lack of, or reduced, ability to source items relating to semiconductor manufacturing from Japan and the Netherlands.

See “Part II. Item 1A – Risk Factors – Regulatory Risks – Our ability to sell our tools to customers in mainland China has been impacted, and will likely continue to be materially and adversely
impacted, by export license requirements, other regulatory changes, or other actions taken by the U.S. or other governmental agencies” for more information.

Key Components of Results of Operations

Revenue

We develop, manufacture and sell innovative capital equipment to the global semiconductor industry. Since we sell tools to a small number of customers and we customize those tools to fulfill the
customers’ specific requirements, our revenue generation fluctuates, depending on the length of the sales, development and evaluation phases:
•

Sales  and  Development.  During  the  sale  process  we  may,  depending  on  a  prospective  customer’s  specifications  and  requirements,  need  to  perform  additional  research,  development  and
testing to establish that a tool can meet the prospective customer’s requirements. Sales cycles for orders that require limited customization and do not require that we develop new technology
usually take from 6 to 12 months, while the product life cycle, including the initial design, demonstration and final assembly phases, for orders requiring development and testing of new
technologies can take as long as 2 to 4 years. As we expand our customer base, we expect to gain more repeat purchase orders for tools that we have already developed and tested, which we
believe will reduce the need for a demonstration phase and shorten the development cycle.
Evaluation Periods. When a chip manufacturer proposes to purchase a particular type of tool from us for the first time, we offer the manufacturer an opportunity to evaluate the tool for a
period that can extend for 24 months or longer. In some cases, we do not receive any payment on first-time purchases until the tool is accepted. As a result, we may spend more than $2.0
million to produce a tool without receiving payment for more than 24 months or, if the tool is not accepted, without receiving any payment. Please see “Item 1A. Risk Factors—Risks Related
to  Our  Business  and  Our  Industry—We  may  incur  significant  expenses  long  before  we  can  recognize  revenue  from  new  products,  if  at  all,  due  to  the  costs  and  length  of  research,
development, manufacturing and customer evaluation process cycles.”
Purchase Orders. In accordance with industry practice, sales of our tools are made pursuant to purchase orders. Each purchase order from a customer for one of our tools contains specific
technical requirements intended to ensure, among other things, that the tool will be compatible with the customer’s manufacturing process line. Until a

•

•

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purchase order is received, we do not have a binding purchase commitment. Some of our customers to date have provided us with non-binding one- to two-year forecasts of their anticipated
demands, and we expect future customers to furnish similar non-binding forecasts for planning purposes. Any of those forecasts would be subject to change, however, by the customer at any
time, without notice to us.
Fulfillment. We seek to obtain a purchase order for a tool from three to four months in advance of the expected delivery date. Depending upon the nature of a customer’s specifications, the
lead time for production of a tool generally will extend from two to four months. The lead-time can be more than six months, however, and in some cases, we may need to begin producing a
tool based on a customer’s non-binding forecast, rather than waiting to receive a binding purchase order.

•

We  expect  our  sales  prices  generally  to  range  from  $0.5  million  to  more  than  $5  million  for  our  production  tools.  The  sales  price  of  a  particular  tool  will  vary  depending  upon  the  required
specifications. We have designed equipment models using a modular configuration that we customize to meet customers’ technical specifications. For example, our Ultra C models for SAPS, TEBO
and  Tahoe  solutions  use  common  modular  configurations  that  enable  us  to  create  a  wet-cleaning  tool  meeting  a  customer’s  specific  requirements,  while  using  pre-existing  designs  for  chamber,
electrical, chemical delivery and other modules.

Because of the relatively high purchase prices of our tools, customers generally pay in installments. For a customer’s repeat purchase of a particular type of tool, the specific payment terms are
negotiated in connection with acceptance milestones of a purchase order. Based on our experience with repeat sales of our tools, we expect that we will receive an initial payment upon delivery of a
tool in connection with a repeat purchase, with the balance being paid after the tool has been tested and accepted by the customer. Our sales arrangements for repeat purchases do not include a
general right of return.

Substantially all of our sales in 2023, 2022, and 2021 were to customers located in Asia, and we anticipate that a substantial majority of our revenue will continue to come from customers located in
this region for the near future. We have increased our sales efforts to penetrate the markets in North America and Western Europe.

We utilize ASC 606 which was adopted in 2018 set forth in Accounting Standards Update, or ASU, No. 2014-09, Revenue from Contracts with Customers (Topic 606), of the Financial Accounting
Standards  Board,  or  FASB,  regarding  the  recognition,  presentation  and  disclosure  of  revenue  in  our  financial  statements  as  described  below  under  “—Critical  Accounting  Estimates—Revenue
Recognition.”

We  offer  extended  maintenance  service  contracts  to  provide  services  such  as  trouble-shooting  or  fine-tuning  tools,  and  installing  spare  parts,  following  expiration  of  applicable  initial  standard
assurance type warranty coverage periods, which for sales to date have extended from 12 to 36 months as described under “—Critical Accounting Estimates—Warranty.” In 2023, 2022, and 2021,
we received payments for parts and labor for service activities provided from time to time, but as of December 31, 2023 we had not yet entered into extended maintenance service contracts with
respect  to  the  substantial  majority  of  tools  for  which  initial  warranty  coverage  had  expired.  We  expect  to  enter  into  extended  maintenance  service  contracts  with  customers  as  additional  initial
warranties expire, but we do not expect revenue from extended maintenance service contracts to represent a material portion of our revenue in the future.

The loss or delay of multiple large sale transactions in a quarter could impact our results of operations for that quarter and any future quarters for which revenue from that transaction is lost or
delayed, as described under “Item 1A. Risk Factors—Risks Related to Our Business and Our Industry—Our quarterly operating results can be difficult to predict and can fluctuate substantially,
which could result in volatility in the price of Class A common stock.” It is difficult to predict accurately when, or even if, we can complete a sale of a tool to a potential customer or to increase sales
to any existing customer. Our tool demand forecasts are based on multiple assumptions, including non-binding forecasts received from customers years in advance, each of which may introduce
error into our estimates. Difficulties in forecasting demand for our tools make it difficult for us to project future operating results and may lead to periodic inventory shortages or excess spending on
inventory or on tools that may not be purchased, as further described in “Item 1A. Risk Factors—Risks Related to Our Business and Our Industry—Difficulties in forecasting demand for our tools
may lead to periodic inventory shortages or excess spending on inventory items that may not be used.”

Cost of Revenue

Cost of revenue for capital equipment consists primarily of:
•

direct costs, which consist principally of costs of tool components and subassemblies purchased from third-party vendors;

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•
•
•
•
•
•

compensation of personnel associated with our manufacturing operations, including stock-based compensation;
depreciation of manufacturing equipment;
amortization of costs of software used for manufacturing purposes;
other expenses attributable to our manufacturing department;
inventory provision; and
allocated overhead for rent and utilities.

We are not party to any long-term purchasing agreements with suppliers. Please see “Item 1A. Risk Factors—Risks Related to Our Business and Our Industry—Our customers do not generally enter
into long-term purchase commitments, and they may decrease, cancel or delay their projected purchases at any time.”

As our customer base and tool installations continue to grow, we may need to hire additional manufacturing personnel. The rates at which we add customers and install tools will affect the level and
time of this spending. In addition, because we often import components and spare parts from the United States, we have experienced, and expect to continue to experience, the effect of the currency
fluctuations on our cost of revenue.

Gross Margin

We generally expect gross margin to range between 40% and 45% for the foreseeable future, with direct manufacturing costs approximating 50% to 55% of revenue and overhead costs totaling
approximately 5% of revenue.

We seek to maintain our gross margin by continuing to develop proprietary technologies that avoid pricing pressure for our wet cleaning equipment. We actively manage our operations through
principles  of  operational  excellence  designed  to  ensure  continuing  improvement  in  the  efficiency  and  quality  of  our  manufacturing  operations  by,  for  example,  implementing  factory  constraint
management  and  change  control  and  inventory  management  systems.  In  addition,  our  purchasing  department  actively  seeks  to  identify  and  negotiate  supply  contracts  with  improved  pricing  to
reduce cost of revenue.

A significant portion of our raw materials are denominated in the RMB, while the majority of our purchase orders are denominated in U.S. dollars. As a result, fluctuations in currency exchange
rates may have a significant effect on our gross margin.

Operating Expenses

We have experienced, and expect to continue to experience, growth in the absolute dollar amount of our operating expenses, as we invest to support the anticipated growth of our customer base and
the continued development of proprietary technologies.

Sales and Marketing

Sales and marketing expense consists primarily of:
•
•
•
•
•
•
•

compensation of personnel associated with pre- and after-sales support and other sales and marketing activities, including stock-based compensation;
sales commissions paid to independent sales representatives;
fees paid to sales consultants;
cost of trade shows;
cost of promotional tools to new potential customers;
travel and entertainment; and
allocated overhead for rent and utilities.

Sales and marketing expense can be significant and may fluctuate, in part because of the resource-intensive nature of our sales efforts and the length and variability of our sales cycle. The length of
our sales cycle, from initial contact with a customer to the execution of a purchase order, is generally 6 to 24 months.

During  the  sales  cycle,  we  expend  significant  time  and  money  on  sales  and  marketing  activities,  including  educating  customers  about  our  tools,  participating  in  extended  tool  evaluations  and
configuring our tools to customer-specific needs. Sales and marketing expense in a given period can be particularly affected by the increase in travel and entertainment expenses associated with the
finalization of purchase orders or the installation of tools.

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Research and Development

Research  and  development  expense  relates  to  the  development  of  new  products  and  processes  and  encompasses  our  research,  development  and  customer  support  activities.  Research  and
development expense consists primarily of:
•
•
•
•
•
•

compensation of personnel associated with our research and development activities, including stock-based compensation;
costs of components and other research and development supplies;
costs of tools built for product development purposes;
travel expense associated with the research of technical requirements for product development purposes and testing of concepts under consideration;
amortization of costs of software used for research and development purposes; and
allocated overhead for rent and utilities.

Some  of  our  research  and  development  has  been  funded  by  grants  from  the  mainland  China  government,  as  described  in  “—mainland  China  Government  Research  and  Development  Funding”
below.

General and Administrative

General and administrative expense consists primarily of:
•
•
•
•

compensation of executive, accounting and finance, human resources, information technology, and other administrative personnel, including stock-based compensation;
professional fees, including accounting and legal fees;
other corporate expenses; and
allocated overhead for rent and utilities.

Stock-Based Compensation Expense

We  grant  stock  options  to  employees  and  non-employee  consultants  and  directors,  and  we  account  for  those  stock-based  awards  in  accordance  with  ASC  Topic  718,  Compensation—Stock
Compensation.

•

•

Stock-based awards granted to employees and non-employees are measured at the fair value of the awards on the grant date and are recognized as expenses either (a) immediately on grant, if
no vesting conditions are required, or (b) using the graded vesting method, net of estimated forfeitures, over the requisite service period. The fair value of stock options is determined using
the Black-Scholes valuation model when there are service and performance condition attached, or the Monte Carlo valuation model when there is market condition attached. Stock-based
compensation expense, when recognized, is charged to cost of revenue or to the category of operating expense corresponding to the service function of the employee or non-employee.
We also grant discounts to employees when they subscribe for the new shares of ACM Shanghai, and we account for those stock-based awards in accordance with Accounting Standards
Codification, or ASC, Topic 718, Compensation—Stock Compensation

Mainland China Government Research and Development Funding

ACM Shanghai has received seven special government grants. The first grant, which was awarded in 2008, relates to the development and commercialization of 65nm to 45nm stress-free polishing
technology. The second grant was awarded in 2009 to fund interest expense on short-term borrowings. The third grant was made in 2014 and relates to the development of electro copper-plating
technology. The fourth grant was made in June 2018 and related to development of polytetrafluoroethylene. The fifth grant was made in 2020, and relates to the development of Tahoe single bench
cleaning technologies. As of December 31, 2021, the fourth and fifth grants had been fully utilized. The sixth grant was made in 2020, and relates to the development of other cleaning technologies.
The seventh grant was made in 2021, and relates to the development of the R&D and production center in the Lin-gang Special Area of Shanghai. These governmental authorities provide significant
funding, although ACM Shanghai and ACM Shengwei is also required to invest certain amounts in the projects.

The governmental grants contain certain operating conditions, and we are required to go through a government due diligence process once the project is complete. The grants therefore are recorded
as long-term liabilities upon receipt,

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although we are not required to return any funds ACM Shanghai receives. Grant amounts are recognized in our statements of comprehensive income (loss) as follows:

•

•

Government subsidies relating to current expenses are recorded as reductions of those expenses in the periods in which the current expenses are recorded. For the years ended December 31,
2023, 2022, and 2021, related government subsidies recognized as reductions of relevant expenses in the consolidated statements of comprehensive income (loss) were $1.7 million, $1.2
million, and $11.3 million, respectively.
Government subsidies related to depreciable assets are credited to income over the useful lives of the related assets for which the grant was received. For the years ended December 31, 2023,
2022, and 2021, related government subsidies recognized as other income in the consolidated statements of comprehensive income (loss) were $0.5 million, $0.3 million, and $0.2 million,
respectively.

Unearned government subsidies received are deferred for recognition and recorded as other long-term liabilities (see note 13 in the Notes to Consolidated Financial Statements included herein under
“Item 8. Financial Statements and Supplementary Data.”) in the consolidated balance sheet until the criteria for such recognition are satisfied.

Net Income Attributable to Non-Controlling Interests and Redeemable Non-Controlling Interests

In  2019  ACM  Shanghai  sold  a  total  number  of  shares  representing  8.3%  of  its  outstanding  ACM  Shanghai  shares,  after  which  ACM  Research  held  the  remaining  91.7%  of  ACM  Shanghai’s
outstanding shares. In 2021 ACM Shanghai sold a total number shares representing an additional 10% of its outstanding ACM Shanghai shares in its STAR IPO, after which ACM Research held the
remaining 82.5% of ACM Shanghai’s outstanding shares. During the year-ended December 31,2023, ACM's ownership declined to 82.1% due to the exercise of 2,150,309 stock options related to
ACM  Shanghai  shares  (note  18).  As  a  result,  we  reflect  the  portion  of  our  net  income  allocable  to  the  minority  holders  of  ACM  Shanghai  shares  as  net  income  attributable  to  non-controlling
interests.

Critical Accounting Policies and Estimates

In preparing our consolidated financial statements in conformity with GAAP, we make assumptions, judgments and estimates in applying our accounting policies that can have a significant impact
on our revenue, operating income and net income, as well as on the value of certain assets and liabilities on our consolidated balance sheets. We base our assumptions, judgments and estimates on
historical experience and various other factors that we believe to be reasonable under the circumstances. At least quarterly, we evaluate our assumptions, judgments and estimates and make changes
as deemed necessary. Actual results could differ materially from these estimates under different assumptions or conditions.

We  believe  that  the  assumptions,  judgments  and  estimates  involved  in  the  accounting  for  the  following  accounting  policies  have  the  greatest  potential  impact  on  our  consolidated  financial
statements,  and  we  therefore  consider  these  to  be  our  critical  accounting  estimates.  For  information  on  our  significant  accounting  policies,  see  Note  2  in  the  notes  to  consolidated  financial
statements.

Revenue Recognition

We derive revenue principally from the sale of semiconductor capital equipment. Revenue from contracts with customers is recognized using the following five steps pursuant to ASC Topic 606,
Revenue from Contracts with Customers:

1.
2.
3.
4.
5.

Identify the contract(s) with a customer;
Identify the performance obligations in the contract;
Determine the transaction price;
Allocate the transaction price to the performance obligations in the contract; and
Recognize revenue when, or as, a performance obligation is satisfied.

Identify  the  contract(s)  with  a  customer.  We  generally  consider  written  documentation  including,  but  not  limited  to,  signed  purchase  orders,  master  agreements,  and  sales  orders  as  contracts,
provided it has approval and commitment from the customer, the rights of the parties are identified, payment terms are identified, the contract has commercial substance, and collection is probable.
Collectability is assessed based on our management’s assessment of the customer’s creditworthiness, historical payment experience, as well as other relevant factors.

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Identify the performance obligations in the contract. Performance obligations are accounted for separately if they are distinct. A good or service is distinct if the customer can benefit from the good
or service either on its own or together with other resources that are readily available to the customer, and the good or service is distinct in the context of the contract. Our performance obligations
generally include sales of tools and spare parts. In addition, customer contracts can contain provisions for installation, training, software updates, most-favored pricing for spare parts, and other
items which have been deemed immaterial in the context of the contract.

Determine the transaction price. The transaction price for our contracts with customers may include fixed and variable consideration. We include variable consideration in the transaction price to the
extent that it is probable that a significant reversal of revenue will not occur in the future based on our historical experience with similar arrangements.

Allocate  the  transaction  price  to  the  performance  obligations  in  the  contract.  For  contracts  that  contain  multiple  performance  obligations,  we  allocate  the  transaction  price  to  the  performance
obligations  on  a  relative  standalone  selling  price  basis.  We  defer  revenue  associated  with  spare  parts,  sold  together  with  its  tools,  based  on  its  stand-alone  observable  selling  prices  or  using  an
expected cost-plus-margin approach when a stand-alone selling price is not directly observable, and recognizes revenue upon subsequent delivery.

Recognize revenue when, or as, a performance obligation is satisfied. We recognize revenue from tools and spare parts at a point in time, when we have satisfied our performance obligation. Our
sales  arrangements  do  not  include  a  general  right  of  return.  For  shipments  made  to  a  customer  that  has  not  previously  accepted  a  specific  type  of  tool  in  the  past,  or  first  tools,  revenues  are
recognized when the goods are accepted by the customer. For shipments made to a customer that has previously accepted a specific type of tool, revenues are recognized upon shipment or delivery
because we can objectively demonstrate that the goods meet all the required customer specifications.

Stock-based compensation

We account for grants of stock options based on their grant date fair value and recognize compensation expense over the vesting periods. We estimate the fair value of the stock options granted with
a service period-based condition and/or performance condition at the date of grant using the Black-Scholes option pricing model. We estimate the fair value of the stock options granted with a
market-based condition at the date of grant using the Monte Carlo simulation model.

For options granted with a service period-based and/or performance condition, we estimate the fair value of these stock option grants using the Black-Scholes option pricing model, which requires
the input of subjective assumptions, including (a)Fair value of share of common stock, (b)the risk-free interest rate, (c) volatility, and (d) the expected term of the award.

• We use the market closing price for the Class A common stock as reported on the Nasdaq Global Market to determine the fair value of the Class A common stock. We use the market

•

closing price for the ACM Shanghai’s common stock as reported on the STAR Market to determine the fair value of ACM Shanghai’s common stock.
For options granted by ACM Research, risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the share options in effect at
the time of grant. For options granted by ACM Shanghai, risk-free interest rate is based on the yields of RMB deposit in mainland China with maturities similar to the expected term of the
share options in effect at the time of grant.

• We use historical volatility of our shares in the period equal to the expected term of each grant.
•

The expected term of share options is based on the average of the vesting period and the contractual term for each grant.

Inventory

Inventories  consist  of  finished  goods,  raw  materials,  work-in-process  and  consumable  materials.  Finished  goods  are  comprised  of  direct  materials,  direct  labor,  depreciation  and  manufacturing
overhead. Inventory is stated at the lower of cost and net realizable value of the inventory on a moving weighted average basis. The cost of an inventory item purchased specifically for a customized
tool is determined using the specific identification method. Market value is determined as the lower of replacement cost and net realizable value, which is the estimated selling price, in the ordinary
course of business, less estimated costs to complete or dispose.

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We assess the recoverability of all inventories quarterly to determine if any adjustments are required. We recognize a loss or impairment if in our judgement the inventory cannot be sold or used for
production, if it has been damaged or should be considered as obsolete, or if the net realizable value is lower than the cost. We also assess the status of our raw materials. We recognize a loss or
impairment for any raw materials aged more than three years. The three-year aging is based on our assessment of technology change, our requirement to maintain stock for warranty coverage, and
other factors. Actual demand may differ from forecasted demand, and those differences may have a material effect on recorded inventory values.

Our manufacturing overhead standards for product costs are calculated assuming full absorption of forecasted spending over projected volumes, adjusted for excess capacity. Abnormal inventory
costs such as costs of idle facilities, excess freight and handling costs, and spoilage are recognized as current period charges.

Allowance for Credit Losses

Accounts  receivables  are  reflected  in  our  consolidated  balance  sheets  at  their  estimated  collectible  amounts.  A  substantial  majority  of  our  accounts  receivable  are  derived  from  sales  to  large
multinational semiconductor manufacturers in Asia. We assess collectability by reviewing accounts receivable on a collective basis where similar characteristics exist and on an individual basis
when we identify specific customers with known disputes or collectability issues. In determining the amount of the allowance for credit losses, we consider historical collectability based on past due
status, the age of the accounts receivable balances, credit quality of our customers based on ongoing credit evaluations, current economic conditions, reasonable and supportable forecasts of future
economic conditions, and other factors that may affect our ability to collect from customers.

Income Taxes

Income taxes are accounted for using the liability method. Under this method, deferred income tax assets and liabilities are recognized for the future tax consequences attributable to temporary
differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred income tax assets and liabilities are measured using enacted tax
rates expected to apply to taxable income in the years in which these temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax
rates is recognized in income in the period that includes the enactment date. A valuation allowance would be provided for the deferred tax assets if it is more likely than not that the related benefit
will not be realized.

On a quarterly basis, we provide income tax provisions based upon an estimated annual effective income tax rate. The effective tax rate is highly dependent upon the geographic composition of
worldwide earnings, tax regulations governing each region, availability of tax credits and the effectiveness of our tax planning strategies. We carefully monitor the changes in many factors and
adjust our effective income tax rate on a timely basis. If actual results differ from these estimates, this could have a material effect on our financial condition and results of operations.

We maintained a partial valuation allowance as of December 31, 2023 with respect to certain net deferred tax assets based on our estimates of recoverability. We determined that the partial valuation
allowance was appropriate given our historical operating losses and uncertainty with respect to our ability to generate profits from our business model sufficient to take advantage of the deferred tax
assets in all applicable tax jurisdictions.

The calculation of our tax liabilities involves dealing with uncertainties in the application of complex tax regulations. In accordance with the authoritative guidance on accounting for uncertainty in
income taxes, we recognize liabilities for uncertain tax positions based on the two-step process. The first step is to evaluate the tax position for recognition by determining if the weight of available
evidence indicates that it is more likely than not that the position will be sustained in audit, including resolution of related appeals or litigation processes, if any. The second step is to measure the tax
benefit as the largest amount that is more than fifty percent likely of being realized upon ultimate settlement. We reevaluate these uncertain tax positions on a quarterly basis. This evaluation is based
on factors including changes in facts or circumstances, changes in tax law, effectively settled issues under audit and new audit activity. Any change in these factors could result in the recognition of a
tax benefit or an additional charge to the tax provision.

Interest and penalties related to uncertain tax positions are recorded in the provision for income tax expense on the consolidated statements of comprehensive income (loss).

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Warranty

We have provided standard assurance type warranty coverage on our tools for 12 to 36 months, covering labor and parts necessary to repair a tool during the warranty period. Warranty obligations
are affected by historical failure rates and associated replacement costs. Utilizing historical warranty cost records, we calculate a rate of warranty expenses to revenue to determine the estimated
warranty charge. We update these estimated charges on a regular basis. The actual product performance and field expense profiles may differ, and in those cases, we adjust our warranty accruals
accordingly. As of December 31, 2023 and 2022, we had accrued $9.8 million and $8.8 million, respectively, in liability contingency for potential warranty claims.

Recent Accounting Pronouncements

For a discussion of recent accounting pronouncements we expect will have an impact when adopted, see note 2 in the Notes to Consolidated Financial Statements included herein under “Item 8.
Financial Statements and Supplementary Data.”

Results of Operations

The following table sets forth our results of operations for the periods presented, as percentages of revenue.

Revenue

Cost of revenue

Gross margin

Operating expenses:

Sales and marketing

Research and development

General and administrative

Total operating expenses, net

Income from operations

Interest income (expense), net

Realized gain from sale of short-term investments

Unrealized gain (loss) on short-term investments

Other income (expense), net

Income from equity method investments

Income before income taxes

Income tax expense

Net income

Less: Net income attributable to non-controlling interests

Net income attributable to ACM Research, Inc.

Year Ended December 31,

2023

2022

2021

100.0 %

100.0 %

100.0 %

50.5 

49.5 

8.4 

16.6 

7.3 

32.3 

17.2 

1.0 

1.6 

(0.5)

(0.3)

1.8 

20.8 

(3.5)

17.3 

3.5 

52.8 

47.2 

10.3 

16.0 

5.8 

32.0 

15.2 

1.8 

0.3 

(2.0)

0.9 

1.2 

17.4 

(4.3)

13.0 

2.9 

55.8 

44.2 

10.3 

13.2 

5.9 

29.4 

14.8 

(0.1)

- 

0.2 

(0.2)

1.8 

16.5 

(0.1)

16.4 

2.0 

13.8 %

10.1 %

14.4 %

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Comparison of Years Ended December 31, 2023, 2022, and 2021

Revenue

Single wafer cleaning, Tahoe and semi-critical cleaning equipment

ECP (front-end and packaging), furnace and other technologies

Advanced packaging (excluding ECP), services & spares

Total Revenue By Product Category

Mainland China
Other Regions

Year Ended December 31,

2023

2022

2021

(in thousands)

403,851  $

272,939  $

103,356 

50,516 

77,482 

38,411 

557,723  $

388,832  $

$

$

189,208 

33,210 

37,333 

259,751 

% Change
2023 v 2022

% Change
2022 v 2021

48.0  %

33.4  %

31.5  %

43.4 %

44.3  %

133.3  %

2.9  %

49.7 %

2023

Year Ended December 31,

2022
(in thousands)

2021

$

$

540,969  $
16,754 

557,723  $

377,752  $
11,080 

388,832  $

258,615 
1,136 

259,751 

The increase in revenue for 2023 compared to 2022 was driven by higher sales of single wafer cleaning, Tahoe and semi-critical cleaning equipment, ECP (front-end and packaging), furnace and
other  technologies,  and  Advance  packaging  (excluding  ECP),  and  services  and  spares.  We  attribute  the  revenue  growth  to  continued  investments  in  mature  process  nodes  by  current  and  new
mainland  China-based  customers  amidst  an  ongoing  target  to  achieve  a  greater  share  of  the  global  semiconductor  market,  incremental  contribution  from  newly  introduced  tools,  and  better
penetration of our product portfolio across our customer base.

The increase in revenue for 2022 compared to 2021 was driven primarily by higher sales of single wafer cleaning, Tahoe and semi-critical cleaning equipment, and increased contribution from
newer ECP (front-end and packaging), furnace and other technologies. Our Shanghai production operations were adversely impacted in the first half of 2022 to COVID-19-related restrictions, with a
return to more normal operations in the second half of the year. The U.S. export regulations imposed in October of 2022 had an adverse impact on ACM Shanghai’s shipments and sales in the fourth
quarter of 2022.

Cost of Revenue and Gross Margin

Year Ended December 31,

2023

2022

(in thousands)

2021

% Change
2023 v 2022

% Change
2022 v 2021

Cost of revenue

Gross profit

Gross margin

$

281,508 

$

205,217 

$

276,215 

49.5 %

183,615 

47.2 %

144,895 

114,856 

44.2 %

37.2 %

50.4 %

2.30 

41.6 %

59.9 %

3.00 

Cost of revenue and gross profit increased in 2023 as compared to 2022 due to the increased sales volume and an increase in gross margin. The increased gross margin versus the prior-year period
was primarily due to improved gross margins for certain products, overall product mix, and a positive impact due to a change in the RMB to U.S. dollar currency exchange rate.

Cost of revenue and gross profit increased in 2022 as compared to 2021 due to the increased sales volume and an increase in gross margin. The increased gross margin versus the prior-year period
was primarily due to a higher mix of ECP (front-

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end and packaging), furnace, and other technologies, and a positive impact due to a change in the RMB to U.S. dollar currency exchange rate.

Gross  margin  may  vary  from  period  to  period,  primarily  related  to  the  level  of  utilization  and  the  timing  and  mix  of  revenue.  We  expect  gross  margin  to  be  between  40.0%  and  45.0%  for  the
foreseeable future, with direct manufacturing costs approximating 50.0% to 55.0% of revenue and overhead costs totaling 5.0% of revenue.

Operating Expenses

Sales and marketing expense

Research and development expense
General and administrative expense

Total operating expenses

Year Ended December 31,

2023

2022

(in thousands)

47,019  $

92,709 

40,648 

180,376  $

39,889  $

62,226 

22,465 

124,580  $

$

$

2021

% Change
2023 v 2022

% Change
2022 v 2021

26,733 

34,207 

15,214 

76,154 

17.9 %

49.0 %

80.9 %

44.8 %

49.2 %

81.9 %

47.7 %

63.6 %

Sales and marketing expense increased in 2023 as compared to 2022, and reflected an increase of $8.1 million due to higher costs for personnel, commissions, travel and entertainment and other
costs, an increase of $4.7 million due to higher costs for professional services, outside services and other costs, and an increase of $3.8 million due to higher stock -based compensation, partly offset
by a decrease of ($9.6 million) for the cost of tools built for promotional purposes.

Sales and marketing expense increased in 2022 as compared to 2021, and reflected an increase of $7.9 million due to higher costs of tools built for promotional purposes for potential new customers,
and an increase of $5.3 million due to increased costs for personnel, commissions, outside services, travel and entertainment and other costs.

We  expect  that,  for  the  foreseeable  future,  sales  and  marketing  expense  will  increase  in  absolute  dollars,  as  we  continue  to  invest  in  sales  and  marketing  by  hiring  additional  employees  and
expanding marketing programs in existing or new markets. We must invest in sales and marketing processes in order to develop and maintain close relationships with customers. We are making
dollar-based  investments  in  order  to  support  growth  of  our  customer  base  in  the  United  States,  and  the  relative  strength  of  the  dollar  could  have  a  significant  effect  on  our  sales  and  marketing
expense.

Research and development expense increased in 2023 as compared to 2022, reflecting an increase of $15.4 million in costs of components, costs of tools built for product development purposes, and
costs of other research and development supplies, an increase of $7.1 million for personnel-related costs, an increase of $5.9 million in stock-based compensation, and an increase of $4.2 million in
travel and entertainment costs to support product development, professional services, and other research and development related expenses, offset by a decrease of ($2.1 million) for outside services.

Research and development expense represented 16.6% and 16.0% of our revenue in the years ended December 31, 2023 and 2022, respectively. Without reduction by grant amounts received from
mainland China governmental authorities (see “—mainland China Government Research and Development Funding”), gross research and development expense totaled $94.5 million, or 16.9% of
total revenue, in the year ended December 31, 2023 as compared to $63.4 million, or 16.3% of revenue, in the corresponding period in 2022.

Research and development expense increased in 2022 as compared to 2021, reflecting an increase of $6.9 million in costs of components, costs of tools built for product development purposes, and
costs of other research and development supplies, and an increase of $16.7 million for personnel, stock-based compensation, and travel and entertainment costs to support product development, and
an increase of $4.4 million for outside services and other research and development related expenses.

We expect that, for the foreseeable future, research and development expense will increase in absolute dollars as compared to 2023, as we continue to invest in research and development to advance
our technologies. We intend to continue to invest in research and development to support and enhance our cleaning, plating, advanced packaging, furnace and future product offerings to build and
maintain our technology leadership position.

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General and administrative expense increased in 2023 as compared to 2022, reflecting an increase of $9.0 million in stock-based compensation, $3.3 million in personnel and professional services
costs, $2.7 million in allowance for credit losses, and $3.1 million for travel & entertainment, depreciation and amortization, outside services, taxes and other general and administrative expenses.

General and administrative expense increased in 2022 as compared to 2021, primarily due to an increase in stock-based compensation, increased employee count, and an increase in legal, payroll tax
and other fees.

We expect that, for the foreseeable future, general and administrative expense will increase in absolute dollars, as we incur additional costs associated with growing our business and operating as a
public company.

Stock-Based Compensation Expense

Cost of revenue and operating expenses during the periods presented below have included stock-based compensation as follows:

Stock-Based Compensation Expense:
Cost of revenue

Sales and marketing expense

Research and development expense

General and administrative expense

Interest income (expense), net, Other Income (expense), net

Interest Income

Interest Expense

Interest Income (expense), net

Other income (expense), net

2023

Year Ended December 31,

2022

(in thousands)

2021

$

$

1,406  $

520  $

5,684 

8,459 

11,789 

1,877 

2,565 

2,768 

27,338  $

7,730  $

397 

1,802 

1,115 

1,803 

5,117 

Year Ended December 31,

2023

2022

(in thousands)

8,354  $

(2,681)

5,673  $

8,740  $

(1,655)

7,085  $

(1,558) $

3,315  $

$

$

$

2021

% Change
2023 v 2022

% Change
2022 v 2021

505 

(765)

(260)

(631)

-4.4 %

62.0 %

-19.9 %

1,630.7 %

116.3 %

-2,825.0 %

-147.0 %

-625.4 %

Interest income (expense), net, decreased in 2023 compared to 2022, principally as a result of reduced interest income from lower interest income on reduced cash balances, offset by increase in
interest expenses incurred from a higher balance of total bank loans.

Interest income (expense), net, increased in 2022 compared to 2021, principally as a result of reduced interest income from lower interest rates on reduced cash balances, offset by increase in interest
expenses incurred from short-term and long-term bank loans.

Other  income  (expense),  net  primarily  reflects  (a)  gains  or  losses  recognized  from  the  impact  of  exchange  rates  on  our  foreign  currency-denominated  working-capital  transactions  and  (b)
depreciation of assets acquired with government subsidies, as described under “—Government Research and Development Funding” above. We realized $1.6 million of other expense in the year
ended December 31, 2023, of which $2.0 million was due to loss realized from transactions that resulted from changes in the RMB-to-U.S. dollar exchange rate, as compared to a foreign exchange
gain of 1.7 million in the corresponding period in 2022.

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Other income (expense) increased by $3.3 million in the year ended December 31, 2022, of which $1.7 million was due to gains realized from transactions that resulted from changes in the RMB-to-
U.S. dollar exchange rate, as compared to a loss of ($0.6 million) in the corresponding period in 2021.

Realized gain and unrealized loss from short-term investments, and income from equity method investments .

Year Ended December 31,

2023

2022

(in thousands)

2021

% Change
2023 v 2022

% Change
2022 v 2021

Absolute Change 
2023 v 2022

Realized gain from sale of short-term
investments

Unrealized gain (loss) on short-term
investments

Income from equity method investments

$

$

$

9,047  $

1,116  $

(2,737) $

9,952  $

(7,855) $

4,666  $

- 

607 

4,637 

710.7 %

-65.2 %

113.3 %

100.0 % $

-1394.1 % $

0.6 % $

7,931 

5,118 

5,286 

We recorded a realized gain on sale of short-term investments of $9.0 million for the year ended December 31, 2023 as compared to a realized gain of $1.1 million for the same period in 2022
primarily due to the sales of ACM Shanghai’s indirect investment in publicly traded shares.

We recorded an unrealized loss on short-term investments of $2.7 million for the year ended December 31, 2023 as compared to an unrealized loss of $7.9 million for the same period in 2022, due
primarily to a change in market value of ACM Shanghai’s indirect investment in publicly traded shares.

We recorded an unrealized loss on short-term investments of $7.9 million for the year ended December 31, 2022 as compared to an unrealized gain of $0.7 million for the same period in 2021, due
primarily to a change in market value of ACM Shanghai’s indirect investment in publicly traded shares.

Income from equity method investments for the year ended December 31, 2023 increased by $5.3 million compared to the year ended December 31, 2022 primarily due to higher net income from
equity method investments.

Income from equity method investments for the year ended December 31, 2022 was unchanged versus the year ended December 31, 2021. Income from equity method investments increased by $4.0
million for the year ended December 31, 2021 due to higher net income from equity method investments.

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Tax Benefit (Expense)

Current:

U.S. federal

U.S. state

Foreign

Total current tax expense

Deferred:

U.S. federal

U.S. state

Foreign

Total deferred tax benefit (expense)

Total income tax expense

2023

Year Ended December 31,

2022

(in thousands)

2021

$

(12,757) $

(479) $

(150)

(19,696)

(32,603)

7,316 

63 

5,860 

13,239 

(18)

(11,139)

(11,636)

(10,927)

8 

5,757 

(5,162)

$

(19,364) $

(16,798) $

(91)

(2)

(2,195)

(2,288)

2,089 

- 

65 

2,154 

(134)

We recognized a tax expense of $19.4 million for the year ended December 31, 2023 as compared to a tax expense of $16.8 million for the prior year period. The increased tax expense in 2023
primarily resulted from the tax effect of increased operating profit generated.

As  we  collect  and  prepare  necessary  data,  and  interpret  the  guidance  issued  by  the  U.S.  Treasury  Department,  the  Internal  Revenue  Service,  and  other  standard-setting  bodies,  we  may  make
adjustments to the provisional amounts. Those adjustments may materially affect our provision for income taxes and effective tax rate in the period in which the adjustments are made. There were
no adjustments made in 2023.

Our  effective  tax  rate  differs  from  statutory  rates  of  21%  for  U.S.  federal  income  tax  purposes  and  12.5%  to  25%  for  mainland  China  income  tax  purposes  due  to  the  effects  of  the  valuation
allowance  and  certain  permanent  differences  as  it  pertains  to  book-tax  differences  in  the  treatment  of  stock-based  compensation  and  non-U.S.  research  expenses.  Our  four  mainland  China
subsidiaries, ACM Shanghai, ACM Wuxi, ACM Beijing, and ACM Lingang, are liable for mainland China corporate income taxes at the rates of 15%, 25%, 25%, and 15%, respectively. Pursuant to
the Corporate Income Tax Law of mainland China, our mainland China subsidiaries generally would be liable for mainland China corporate income taxes at a rate of 25%. According to Guoshuihan
2009  No.  203,  an  entity  certified  as  an  “advanced  and  new  technology  enterprise”  is  entitled  to  a  preferential  income  tax  rate  of  15%.  ACM  Shanghai  was  certified  as  an  “advanced  and  new
technology  enterprise”  in  2012  and  again  in  2016,  2018,  and  2021,  effective until December 31, 2023, and is expected to be re-certified for future years in 2024.  In  2021,  ACM  Shanghai  was
certified as an eligible integrated circuit production enterprise and is entitled to a preferential income tax rate of 12.5% from January 1, 2020 to December 31, 2022. Certain entities which meet
requirements according to the Policy of the Lingang New area in China (Shanghai) Pilot Free Trade Zone are entitled to a preferential income tax rate of 15%. ACM Lingang was certified for this in
2021, and this preferential income tax rate is valid from December 31, 2020 until December 31, 2024.

We file income tax returns in the United States and state and foreign jurisdictions. All tax returns will remain open for examination by the federal and state authorities for three and four years,
respectively, from the date of utilization of any net operating loss or credits. Certain tax years are subject to foreign income tax examinations by tax authorities until the statute of limitations expire.

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Net Income Attributable to Non-Controlling Interests

Year Ended December 31,

2023

2022

(in thousands)

2021

% Change
2023 v 2022

% Change
2022 v 2021

Net income attributable to non-controlling interests

$

19,503  $

11,301  $

5,164 

72.6 %

118.8 %

ACM Research owns 82.1% of ACM Shanghai’s (note 1) outstanding shares which is reflected in our consolidated financial statements (note 2). We reflect the portion of net income allocable to the
minority holders of ACM Shanghai shares as net income attributable to non-controlling interests.

Foreign currency translation adjustment

Year Ended December 31,

2023

2022

(in thousands)

2021

% Change
2023 v 2022

% Change
2022 v 2021

Foreign currency translation adjustment

$

(10,617) $

(59,102) $

4,695 

-82.0 %

-1358.8 %

We recorded a foreign currency translation adjustment of ($10.6 million) for the year ended December 31, 2023, as compared to $(59.1) million for 2022, based on the net effect of RMB to dollar
exchange  rate  fluctuations  for  the  period  on  the  converted  value  of  ACM  Shanghai’s  RMB-denominated  balances  to  U.S.  dollar  equivalents.  The  2022  amount  was  especially  large  due  to  a
weakening of the RMB versus the U.S. dollar during the year ended December 31, 2022 together with a more significant RMB-denominated asset balance in 2022.

Comprehensive income (loss) attributable to non-controlling interests

Year Ended December 31,

2023

2022

(in thousands)

2021

% Change
2023 v 2022

% Change
2022 v 2021

Comprehensive income (loss) attributable to non-controlling interests $

17,689  $

1,854  $

5,607 

854.1 %

-66.9 %

Comprehensive income attributable to non-controlling interest increased by $15.8 million compared to a decrease of $(3.8) million for the years ended December 31, 2023 and 2022 compared to the
prior year, due to a significant change in net income generated from the non-controlling interests as impacted from foreign exchange rate fluctuations.

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Liquidity and Capital Resources

The following chart depicts our corporate organization as of December 31, 2023:

A  detailed  description  of  how  cash  is  transferred  through  our  organization  is  set  forth  under  “Note  2  –  Summary  of  Significant  Accounting  Policies  –  Cash  and  Cash  Equivalents”  to  the
Consolidated Financial Statements of this report.

During the year ended December 31, 2023, we funded our technology development and operations principally through our beginning global cash balances, including the cash balances at ACM
Shanghai, borrowings by ACM Shanghai from local financial institutions and our loan from China CITIC Bank. Cash and cash equivalents, restricted cash, short-term time deposits and long-term
time deposits were $304.5 million at December 31, 2023, compared to $420.9 million at December 31, 2022. The ($116.4 million) decrease was primarily driven by ($75.3 million) of cash used in
operations,  ($60.2  million)  used  in  investing  activities  excluding  the  change  in  time  deposits,  $18.5  million  net  cash  provided  by  financing  activities,  a  $1.7  million  decrease  from  the  effect  of
exchange rate on cash, cash equivalents and restricted cash, and a $2.4 million increase from the effect of exchange rate on time deposits.

The table below represents the cash and cash equivalents, restricted cash, and time deposits as of December 31, 2023 and 2022:

Cash and cash equivalents, restricted cash, and time deposits:

Cash and cash equivalents and restricted cash

Short-term time deposits

Long-term time deposits

Total

December 31,

2023

2022

(In thousands)

$

$

183,173  $

80,524 

40,818 

304,515  $

248,451 

70,492 

101,956 

420,899 

Our future working capital needs beyond the next twelve months will depend on many factors, including the rate of our business and revenue growth, the payment schedules of our customers, the
timing and magnitude of our capital expenditures, and the timing of investment in our research and development as well as sales and marketing. We believe our existing cash and cash equivalents
and short-term and long-term time deposits, our cash flow from operating activities, and bank borrowings by us and ACM Shanghai will be sufficient to meet our anticipated cash needs within our
longer-term planning horizon.

ACM  Shanghai  has  historically  participated  in  certain  mainland  China  government-sponsored  grant  and  subsidy  programs,  as  described  under  “—Key  Components  of  Results  of  Operations—
mainland China Government Research and Development Funding” and “—Contractual Obligations” and we expect that ACM Shanghai will continue to take

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advantage  of  these  programs  when  they  are  available  and  fit  with  our  business  strategy.  ACM  Shanghai  generally  applies  for  these  grants  and  subsidies  through  the  applicable  mainland  China
government agency’s defined processes. Periodically, the public relations department researches the availability of these grants and subsidies through mainland China government agencies with
whom ACM Shanghai files business surveys and taxes. Management of ACM Shanghai then assesses which grants and subsidies for which ACM Shanghai may be eligible and submits the relevant
application. The decision to award the grant to ACM Shanghai is made by the relevant mainland China government agencies based on suitability and the merits of the application. Neither ACM
Research, nor ACM Shanghai or any of our other subsidiaries, has any direct relationship with any mainland China government agency, and our anticipated cash needs for the next twelve months
neither anticipate, nor require, receipt of any mainland China government grants or subsidies.

To the extent our cash and cash equivalents, cash flow from operating activities and short-term bank borrowings are insufficient to fund our future activities in accordance with our strategic plan, we
may  determine  to  raise  additional  funds  through  public  or  private  debt  or  equity  financings  or  additional  bank  credit  arrangements.  We  also  may  need  to  raise  additional  funds  in  the  event  we
determine  in  the  future  to  effect  one  or  more  acquisitions  of  businesses,  technologies  and  products.  If  additional  funding  is  necessary  or  desirable,  we  may  not  be  able  to  obtain  bank  credit
arrangements or to affect an equity or debt financing on terms acceptable to us or at all.

Restrictions under mainland China laws and regulations as well as restrictions under ACM Shanghai’s bank loan agreements, may significantly restrict ACM Shanghai’s ability to transfer a portion
of ACM Shanghai’s net assets to ACM Research, other subsidiaries of ACM Research and to holders of ACM Research Class A common stock. See “Item 1A. Risk Factors–Regulatory Risks–
Mainland China’s currency exchange control and government restrictions on investment repatriation may impact our ability to transfer funds outside of mainland China, which could materially and
adversely affect our ability to grow, make investments or acquisitions that could benefit our business, otherwise fund and conduct our business, or pay dividends on our common stock.”

For  the  years  ended  December  31,  2023  and  2022,  with  the  exception  of  sales  and  services-related  transfer-pricing  payments  in  the  ordinary  course  of  business,  and  dividends  paid  by  ACM
Shanghai to ACM Research, no transfers or distributions have been made between ACM Research, and its subsidiaries, including ACM Shanghai, or to holders of ACM Research Class A common
stock.

Our cash and cash equivalents at December 31, 2023 were held for working capital purposes and other potential investments. ACM Shanghai, our only direct mainland China subsidiary, is, however,
subject to mainland China restrictions on distributions to equity holders. The use of proceeds raised by the STAR Market IPO, without further approvals, are limited to specific usage. We currently
intend for ACM Shanghai to retain all available funds from any future earnings for use in the operation of its business and do not anticipate it paying any cash dividends. Our accounts receivable
balance  fluctuates  from  period  to  period,  which  affects  our  cash  flow  from  operating  activities.  Fluctuations  vary  depending  on  cash  collections,  client  mix,  and  the  timing  of  shipment  and
acceptance of our tools.

We  have  never  declared  or  paid  cash  dividends  on  our  capital  stock.  We  intend  to  retain  all  available  funds  and  any  future  earnings  to  support  the  operation  of  and  to  finance  the  growth  and
development of our business and do not anticipate paying any cash dividends in the foreseeable future.

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Cash Flow Used in Operating Activities. Net cash used by operations of ($75.3 million) during the year ended December 31, 2023 consisted of:

Net Income

 Non-cash operating lease cost

  Provision for inventory

  Provision for credit losses

Gain on disposals of property plant and equipment

Depreciation and amortization

Realized gain on short-term investments

Income from equity method investments

Unrealized loss (gain) on short-term investments

Deferred income taxes

Stock-based compensation

Net changes in operating assets and liabilities:

Net cash flow used in operating activities

2023

Year Ended December 31,

2022

(in thousands)

2021

$

96,852  $

50,564  $

3,580 

575 

2,741 

(2)

8,092 

(9,047)

(9,952)

2,737 

(13,647)

27,338 

(184,590)

$

(75,323) $

2,816 

2,248 

- 

(12)

5,366 

(1,116)

(4,666)

7,855 

4,027 

7,730 

(137,006)

(62,194) $

42,921 

2,451 

75 

- 

- 

2,353 

- 

(4,637)

(607)

(1,840)

5,117 

(85,926)

(40,093)

Significant changes in operating asset and liability accounts during the year-ended December 31, 2023 included the following uses of cash: increases of inventories of $164.0 million (Note 5), and
an  increase  of  accounts  receivable  of  $108.7  million  (Note  4).  As  described  under  “—Key  Components  of  Results  of  Operations—mainland  China  Government  Research  and  Development
Funding,” ACM Shanghai has received research and development grants from local and central mainland China governmental authorities. ACM Shanghai received $51,000 of payments related to
such grants in the year ended December 31, 2023, as compared to cash receipts of $1.1 million in the same period of 2022.

The uses of cash are offset by the following significant sources of cash: an increase in advances from customers of $30.0 (Note 3), an increase in other payables and accrued expenses of $21.4
million, and an increase in accounts payable of $42.3 million.

Cash Flow Used in Investing Activities. Net cash used in investing activities for the year ended December 31, 2023, excluding net cash proceeds from the sale of time deposits, was ($60.2 million),
primarily consisting of ($64.3 million) purchase of property and equipment and intangible assets, and ($7.5 million) purchase of long-term investments (note 14), partly offset by $3.4 million net
proceeds from the sale of short-term investments, and $8.2 million of dividends received from long-term investments (note 14).

Cash Flow provided by Financing Activities. Net cash provided by financing for the year ended December 31, 2023 was $18.5 million, primarily consisting of $16.3 million net proceeds from short
and long-term borrowings, and $6.1 million in proceeds from the exercise of stock options, partly offset by ($4.0 million) of dividends paid by ACM Shanghai.

We and ACM Shanghai, together with the subsidiaries of ACM Shanghai, have short-term and long-term borrowings with six banks, as follows:

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Table of Contents

Lender

Agreement Date

Maturity Date

China CITIC Bank (2)

July 2023

Repayable by installments
and the last installments
repayable in December
2025

China Everbright Bank

July 2021

August 2024

 Bank of China

September 2023

September 2024

China Merchants Bank

August 2023

September 2024

 China Merchants Bank

November 2020

 Bank of China

June 2021

 Bank of China

September, 2021

Repayable by installments
and the last installments
repayable in November
2030

Repayable by installments
and the last installments
repayable in June 2024

Repayable by installments
and the last installments
repayable in September
2024

 Bank of Shanghai

December,2022

October 2024

 China CITIC Bank

August 2023 Repayable by installments

and the last installments
repayable in August 2025

 Industrial Bank of Korea

July 2023 July 2024

 Industrial Bank of Korea

December 2023 December 2024

Annual
Interest Rate

Maximum
Borrowing
Amount(1)

Amount
Outstanding
at December 31,
2023

(in thousands)

RMB200,000

RMB100,000

4.50 %

3.00 %

2.87 %

3.00 %   

3.95 %

2.60 %

2.60 %

2.85 %

3.10 %

6.03 %

4.27 %

$

$

$

$

$

$

$

$

$

$

$

$

28,240 

RMB150,000 

21,180 

RMB40,000

$

$

14,120 

RMB17,440

2,463 

RMB40,000

5,648  5536 $

5,648 

RMB200,000

 RMB153,000

28,240 

$

21,603 

RMB128,500

RMB94,633

18,144 

RMB10,000

1,412 

RMB35,000

4,942 

RMB100,000

14,120 

RMB100,000

14,120 

KRW500,000

386 

KRW2,000,000

1,544 

137,976 

$

$

$

$

$

$

$

$

13,362 

RMB7,500

1,059.00 

RMB28,000

3,954 

RMB100,000

14,120 

RMB100,000

14,120 

KRW100,000

77 

KRW2,000,000

1,544 

92,070 

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(1) Converted from RMB to dollars as of December 31, 2023. The loan from China Merchants Bank is secured by a pledge of the property of ACM Lingang and guaranteed by ACM Shanghai,

as described above under “—Contractual Obligations.”
This China CITIC bank facility agreement is with ACM Research, Inc.

(2)

Effect of exchange rate changes on cash, cash equivalents and restricted cash. The impact of fluctuations of the RMB to U.S. dollar currency exchange rate on a significant balance of our cash,
and cash equivalents held in RMB-denominated accounts (Note 2) contributed to a $1.7 million decrease in the value of these items during the year ended December 31, 2023.

Contractual Obligations

Grant Contract for State-owned Construction Land Use Right in Shanghai City

In  2020  ACM  Shanghai,  through  its  wholly-owned  subsidiary  ACM  Lingang,  entered  into  a  Grant  Contract  for  State-owned  Construction  Land  Use  Right  in  Shanghai  City  (Category  of  R&D
Headquarters and Industrial Projects), or the Grant Agreement, with the China (Shanghai) Pilot Free Trade Zone Lin-gang Special Area Administration, or the Grantor. ACM Lingang obtained
rights to use approximately 43,000 square meters (10.6 acres) of land in the Lingang Heavy Equipment Industrial Zone of Lin-gang Special Area of China (Shanghai) Pilot Free Trade Zone, or the
Land Use Right, for a period of fifty years, commencing on the date of delivery of the land in July 2020, which we refer to as the Delivery Date.

In exchange for its land use rights, ACM Lingang paid aggregate grant fees of RMB 61.7 million ($9.5 million), or the Grant Fees, and a performance deposit of RMB 12.3 million ($1.9 million),
which is equal to 20% of the aggregate Grant Fees, to secure its achievement of the following performance milestones:

•
•
•

the start of construction within 6 months after the Delivery Date (60% of the performance deposit), or Construction Start Milestone;
the completion of construction within 30 months after the Delivery Date (20% of the performance deposit), or Construction Completion Milestone; and
the start of production within 42 months after the Delivery Date (20% of the performance deposit), or Production Start Milestone.

Upon satisfaction of a milestone, the portion of the performance deposit attributable to that milestone will be repayable to ACM Shengwei within ten business days. If the achievement of any of the
above milestones is delayed or abandoned, ACM Shengwei may be subject to additional penalties and may lose its rights to both the use of the granted land and any partially completed facilities on
that land.

The status of the performance milestones for the period ended December 31, 2023 is as follows:

•
•

◦

◦

ACM Lingang achieved the Construction Start Milestone and 60% of the performance deposit was refunded to ACM Shanghai in 2020.
The Construction Completion Milestone was required to be met by January 9, 2024 but was not achieved. However, ACM Lingang believes it will receive the refund without penalty
based on its explanation to the respective regulatory authorities of logistic-related delays, and expectations that it will meet the milestone before July 9, 2024. We cannot guarantee
that  ACM  Lingang  will  achieve  the  missed  milestone  in  2024,  or  even  if  it  does  achieve  the  milestone  in  2024,  that  it  will  be  refunded  some  or  all  of  the  20%  portion  of  the
performance deposit of RMB 2.5 million ($0.4 million).

Contractual penalties in the case of a delay of Construction Completion Milestone:

If ACM Lingang fails to complete the construction pursuant to the date agreed under the Grant Agreement or any extended completion date approved by the Grantor, ACM Lingang
shall pay 50% of the deposit for timely completion of construction as liquidated damages;
If ACM Lingang delays the completion for more than six months beyond the date agreed under the Grant Agreement, or beyond any extended completion date approved by the
Grantor, it shall pay the total deposit for timely completion of construction as liquidated damages.

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◦

•

◦

◦

If the delay is more than one year, the Grantor is entitled to terminate the Grant Agreement and take back the Land Use Right. In such case, the Grantor shall refund the Grant Fees
for the remaining land use term after deducting the deposit agreed under the Grant Agreement and refund the deposit for timely commencement of production and relevant bank
interests in full to ACM Lingang.

The Production Start Milestone is now required to be met by January 9, 2025. The Production Start Milestone was originally required to be met prior to January 9, 2024, but due to
COVID-related delays, ACM filed multiple requests for extensions, the latest of which was granted on July 7, 2023. We cannot guarantee that ACM Lingang will meet any extended
deadline or be refunded this 20% portion of the performance deposit.

Contractual penalties in the case of a delay of Production Start Milestone:

If ACM Lingang fails to commence production pursuant to the date agreed under the Grant Agreement or any extended commencement date approved by the Grantor, ACM Lingang
shall pay the total deposit for timely commencement of production as liquidated damages;
If  ACM  Lingang  fails  to  commence  production  pursuant  to  the  extended  commencement  of  production  date  (more  than  six  months  beyond  the  production  start  milestone),  the
Grantor is entitled to terminate the Grant Agreement and take back the Land Use Right. In such case, the Grantor shall refund the Grant Fees for the remaining land use term after
deducting the deposit agreed under the Grant Agreement to ACM Lingang.

In addition to the milestones, covenants in the Grant Agreement require that, among other things, ACM Lingang will be required to pay liquidated damages in the event that:

(a)

(b)

it does not make a total investment (including the costs of construction, fixtures, equipment and grant fees) of at least RMB 450.0 million ($63.4 million). ACM Lingang shall pay the
liquidated damages equal to the same proportion of the Grant Fees as the proportion of the actual shortfall amount of investment in the total agreed investment amount or the investment
intensity.
within six years after the Delivery Date, or prior to July 9, 2026, it does not (i) generate a minimum specified amount of annual sales of products manufactured on the granted land or (ii)
pay at least RMB 157.6 million ($22.2 million) in annual total taxes (including value-added taxes, corporate income tax, personal income taxes, urban maintenance and construction taxes,
education surcharges, stamp taxes, and vehicle and shipping taxes) as a result of operations in connection with the granted land.

If the total tax revenue of the project fails to reach but is no less than 80% of the standard agreed under the Grant Agreement, ACM Lingang shall pay 20% of the actual shortfall amount of the tax
revenue as liquidated damages. If the total tax revenue of the project fails to reach 80% of the standard agreed under the Grant Agreement within 1 month after the agreed date of reaching target
production, the Grantor is entitled to terminate the Grant Agreement, take back the Land Use Right, and shall refund the Grant Fees for the remaining land use term to ACM Lingang.

If the Grant Agreement is terminated because of breach of any terms above, the Grantor shall take back the buildings, fixtures and auxiliary facilities on the land area and provide ACM Lingang
with corresponding compensation according to the residual value of the buildings, fixtures and auxiliary facilities when they are taken back. The total cumulative investment of land, buildings and
construction in progress related to ACM Lingang amounted to $116.9 million and $35.4 million at December 31, 2023 and December 31, 2022, respectively.

How We Evaluate Our Operations

We present information below with respect to four measures of financial performance:

•

•

•

We define “shipments” of tools to include (a) a “repeat” delivery to a customer of a type of tool that the customer has previously accepted, for which we recognize revenue upon delivery, and
(b) a “first-time” delivery of a “first tool” to a customer on an approval basis, for which we may recognize revenue in the future if contractual conditions are met, or if a purchase order is
received.
We define “adjusted EBITDA” as net income excluding interest expense (net), income tax benefit (expense), depreciation and amortization, unrealized (gain) loss on short-term investments,
and stock-based compensation. We define adjusted EBITDA to also exclude restructuring costs, although we have not incurred any such costs to date.
We define “free cash flow” as net cash provided by operating activities less purchases of property and equipment (net of proceeds from disposals).

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•

We define “adjusted operating income (loss)” as our income (loss) from operations excluding stock-based compensation.

These financial measures are not based on any standardized methodologies prescribed by accounting principles generally accepted in the United States, or GAAP, and are not necessarily comparable
to similarly titled measures presented by other companies.

We have presented shipments, adjusted EBITDA, free cash flow and adjusted operating income (loss) because they are key measures used by our management and board of directors to understand
and evaluate our operating performance, to establish budgets and to develop operational goals for managing our business. We believe that these financial measures help identify underlying trends in
our business that could otherwise be masked by the effect of the expenses that we exclude. In particular, we believe that the exclusion of the expenses eliminated in calculating adjusted EBITDA and
adjusted operating income (loss) can provide useful measures for period-to-period comparisons of our core operating performance and that the exclusion of property and equipment purchases from
operating cash flow can provide a usual means to gauge our capability to generate cash. Accordingly, we believe that these financial measures provide useful information to investors and others in
understanding and evaluating our operating results, enhancing the overall understanding of our past performance and future prospects, and allowing for greater transparency with respect to key
financial metrics used by our management in its financial and operational decision-making.

Shipments, adjusted EBITDA, free cash flow and adjusted operating income (loss) are not prepared in accordance with GAAP, and should not be considered in isolation of, or as an alternative to,
measures prepared in accordance with GAAP.

Shipments

We consider shipments a key operating metric as it reflects the total value of products delivered to customers and prospective customers by our productive assets.

Shipments consist of two components:

•
•

a shipment to a customer of a type of tool that the customer has previously accepted, for which we recognize revenue when the tool is delivered; and
a shipment to a customer of a type of tool that the customer is receiving and evaluating for the first time, in each case a “first tool,” for which we may recognize revenue at a later date, subject
to the customer’s acceptance of the tool upon the tool’s satisfaction of applicable contractual requirements or subject to the customer’s subsequent discretionary commitment to purchase the
tool.

“First tool” shipments can be made to either an existing customer that has not previously accepted that specific type of tool in the past ─ for example, a delivery of a SAPS V tool to a customer that
previously had received only SAPS II tools ─ or to a new customer that has never purchased any tool from us.

Shipments for the years ended December 31, 2023, 2022, and 2021 totaled $597 million, $539 million, and $372 million, respectively. Repeat tool shipments in the years ended December 31, 2023,
2022, and 2021 totaled $310 million, $288 million and $210 million, respectively. First tool shipments for the years ended December 31, 2023, 2022, and 2021 totaled $286 million, $251 million,
and $162 million, respectively.

The dollar amount attributed to a “first tool” shipment is equal to the consideration we expect to receive if any and all contractual requirements are satisfied and the customer accepts the tool, or if
the customer subsequently determines in its discretion to purchase the tool. There are a number of limitations related to the use of shipments in evaluating our business, including that customers
have significant, or in some cases total, discretion in determining whether to accept or purchase our tools after evaluation and their decision not to accept or purchase delivered tools is likely to result
in  our  inability  to  recognize  revenue  from  the  delivered  tools.  “First  tool”  shipments  reflect  the  value  of  incremental  new  products  under  evaluation  delivered  to  our  customers  or  prospective
customers for a given period and is used as an internal key metric to reflect future potential revenue opportunity. The cumulative cost of “first tool” shipments under evaluation at customers which
have not been accepted by the customer is carried at cost and reflected in finished goods inventory (see note 5 to the condensed consolidated financial statements included in this report). “First tool”
shipments exclude deliveries to customers for which ACM does not have a basis to expect future revenue.

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Adjusted EBITDA

There are a number of limitations related to the use of adjusted EBITDA rather than net income (loss), which is the nearest GAAP equivalent. Some of these limitations are:

•
•

•

•
•
•
•
•

•

adjusted EBITDA excludes depreciation and amortization and, although these are non-cash expenses, the assets being depreciated or amortized may have to be replaced in the future;
we exclude stock-based compensation expense from adjusted EBITDA and adjusted operating income (loss), although (a) it has been, and will continue to be for the foreseeable future, a
significant recurring expense for our business and an important part of our compensation strategy and (b) if we did not pay out a portion of our compensation in the form of stock-based
compensation, the cash salary expense included in operating expenses would be higher, which would affect our cash position;
the expenses and other items that we exclude in our calculation of adjusted EBITDA may differ from the expenses and other items, if any, that other companies may exclude from adjusted
EBITDA when they report their operating results;
adjusted EBITDA does not reflect changes in, or cash requirements for, working capital needs;
adjusted EBITDA does not reflect interest expense, or the requirements necessary to service interest or principal payments on debt;
adjusted EBITDA does not reflect income tax expense (benefit) or the cash requirements to pay taxes;
adjusted EBITDA does not reflect historical cash expenditures or future requirements for capital expenditures or contractual commitments;
although depreciation and amortization charges are non-cash charges, the assets being depreciated and amortized will often have to be replaced in the future, and adjusted EBITDA does not
reflect any cash requirements for such replacements; and
adjusted EBITDA includes expense reductions and non-operating other income attributable to mainland China governmental grants, which may mask the effect of underlying developments in
net income, including trends in current expenses and interest expense, and free cash flow includes the mainland China governmental grants, the amount and timing of which can be difficult to
predict and are outside our control.

The following table reconciles net income, the most directly comparable GAAP financial measure, to adjusted EBITDA:

Adjusted EBITDA Data:

Net Income

Interest expense (income), net

Income tax expense

Depreciation and amortization

Stock based compensation

Unrealized (gain) loss on short-term investments

Adjusted EBITDA

Year Ended December 31,

2023

2022

(in thousands)

96,852  $

50,564  $

(5,673)

19,364 

8,092 

27,338 

2,737 

(7,085)

16,798 

5,366 

7,730 

7,855 

148,710  $

81,228  $

$

$

2021

% Change
2023 v 2022

Absolute
Change 2023 v
2022

42,921 

260 

134 

2,353 

5,117 

(607)

50,178 

91.5 % $

-19.9 %

15.3 %

50.8 %

253.7 %

-65.2 %

83.1 % $

46,288 

1,412 

2,566 

2,726 

19,608 

(5,118)

67,482 

The  $67.5  million  increase  in  adjusted  EBITDA  for  the  year  ended  December  31,  2023  as  compared  to  the  year  ended  December  31,  2022  reflected  higher  income  tax  expense,  a  decrease  in
unrealized loss on short-term investments, an increase in net income, an increase in stock-based compensation, and an increase in depreciation and amortization, partly offset by a negative impact
from an increase in interest income, net.

We do not exclude from adjusted EBITDA expense reductions and non-operating other income attributable to mainland China governmental grants because we consider and incorporate the expected
amounts and timing of those grants in incurring expenses and capital expenditures. If we did not receive the grants, our cash expenses therefore would be lower,

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and our cash position would not be affected, to the extent we have accurately anticipated the amounts of the grants. For additional information regarding our mainland China grants, please see “—
Key Components of Results of Operations—mainland China Government Research and Development Funding.”

Free Cash Flow

The following table reconciles net cash provided by (used in) operating activities, the most directly comparable GAAP financial measure, to free cash flow:

Free Cash Flow Data:

Net cash used in operating activities

Purchase of property and equipment

Purchase of long-term investments

Free cash flow

Year Ended December 31,

2023

2022

(in thousands)

2021

% Change
2023 v 2022

Absolute
Change 2023 v
2022

$

$

(75,323) $

(62,194) $

(61,876)

(7,508)

(91,094)

(4,279)

(144,707) $

(157,567) $

(40,093)

(9,153)

- 

(49,246)

21.1 % $

-32.1 %

75.5 %

-8.2 % $

(13,129)

29,218 

(3,229)

12,860 

The changes in free cash flow for the years ended December 31, 2023, 2022, and 2021 reflected the factors driving net cash used in operating activities, and an increase of purchases of property and
equipment.  Consistent  with  our  methodology  for  calculating  adjusted  EBITDA,  we  do  not  adjust  free  cash  flow  for  the  effects  of  mainland  China  government  subsidies,  because  we  take  those
subsidies into account in incurring expenses and capital expenditures. We do not adjust free cash flow for the effects of time-deposits, which for our internal purposes are considered as largely
similar to cash.

Adjusted Operating Income

Adjusted operating income excludes stock-based compensation from income from operations. Although stock-based compensation is an important aspect of the compensation of our employees and
executives, determining the fair value of certain of the stock-based instruments we utilize involves a high degree of judgment and estimation and the expense recorded may bear little resemblance to
the actual value realized upon the vesting or future exercise of the related stock-based awards. Furthermore, unlike cash compensation, the value of stock options, which is an element of our ongoing
stock-based  compensation  expense,  is  determined  using  a  complex  formula  that  incorporates  factors,  such  as  market  volatility,  that  are  beyond  our  control.  Management  believes  it  is  useful  to
exclude stock-based compensation in order to better understand the long-term performance of our core business and to facilitate comparison of our results to those of peer companies. The use of
non-GAAP financial measures excluding stock-based compensation has limitations. If we did not pay out a portion of our compensation in the form of stock-based compensation, the cash salary
expense included in

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operating expenses would be higher and our cash holdings would be less. The following tables reflect the exclusion of stock-based compensation, or SBC, from line items comprising income from
operations:

Actual
(GAAP)

2023

SBC

Adjusted
(Non-GAAP)

Actual
(GAAP)

Year Ended December 31,

2022

SBC

(in thousands)

Adjusted
(Non-GAAP)

Actual
(GAAP)

2021

SBC

Adjusted
(Non-GAAP)

Revenue
Cost of revenue

Gross profit

Operating expenses:

$

557,723  $
(281,508)

276,215 

Sales and marketing
Research and development
General and administrative

(47,019)
(92,709)
(40,648)

-  $

(1,406)

(1,406)

(5,684)
(8,459)
(11,789)

557,723  $
(280,102)

277,621 

388,832  $
(205,217)

183,615 

-  $

(520)

(520)

388,832  $
(204,697)

184,135 

259,751  $
(144,895)

114,856 

-  $

(397)

(397)

(41,335)
(84,250)
(28,859)

(39,889)
(62,226)
(22,465)

(1,877)
(2,565)
(2,768)

(38,012)
(59,661)
(19,697)

(26,733)
(34,207)
(15,214)

(1,802)
(1,115)
(1,803)

Income (loss) from operations

$

95,839  $

(27,338) $

123,177  $

59,035  $

(7,730) $

66,765  $

38,702  $

(5,117) $

259,751 
(144,498)

115,253 

(24,931)
(33,092)
(13,411)

43,819 

Adjusted operating income for the year ended December 31, 2023, as compared with the year ended December 31, 2022, increased by $56.4 million due to a $36.8 million increase in income from
operations and a $19.6 million increase in stock-based compensation expense. Adjusted operating income for the year ended December 31, 2022, as compared with the year ended December 31,
2021, increased by $22.9 million due to a $20.3 million increase in income from operations and a $2.6 million increase in stock-based compensation expense.

Item 7A.    Quantitative and Qualitative Disclosures About Market Risk

As a result of our operating, investing and financing activities, we are exposed to market risks such as interest rate risk and foreign currency exchange rate risk. We are also exposed to credit risk as
a result of our normal business activities.

Foreign Currency Exchange Risk

Our consolidated financial statements are presented in U.S. dollars, which is our reporting currency, while the functional currency of our subsidiaries in mainland China is RMB, and the functional
currency of our subsidiary in Korea is the Korean Won, or the KRW. Transactions in foreign currencies are initially recorded at the functional currency rate prevailing at the date of the transactions.
Any difference between the initially recorded amount and the settlement amount is recorded as a gain or loss on foreign currency transaction in our consolidated statements of comprehensive income
(loss). Monetary assets and liabilities denominated in a foreign currency are translated at the functional currency rate of exchange as of the date of a consolidated balance sheet. Any difference is
recorded as a gain or loss on foreign currency translation in the appropriate consolidated statement of operations. In accordance with ASC Topic 830, Foreign Currency Matters, we translate the
assets and liabilities into U.S. dollars from RMB using the rate of exchange prevailing at the applicable balance sheet date and the consolidated statements of comprehensive income (loss) and cash
flows  are  translated  at  an  average  rate  during  the  reporting  period.  Adjustments  resulting  from  the  translation  are  recorded  in  stockholders’  equity  as  part  of  accumulated  other  comprehensive
income.

The majority of our business is conducted through our ACM Shanghai subsidiary that manufactures and sells our products in various global markets, and we also have operations in Korea, the
Taiwan Region, the United States, and other countries. We sell the majority of our products in transactions denominated in U.S. dollars; however, we purchase raw materials, pay wages, and make
payments  to  our  supply  chain  in  foreign  currencies,  primarily  RMB,  and  also  the  KRW.  As  a  result,  our  earnings,  cash  flows  and  cash  balances  are  exposed  to  fluctuations  in  foreign  currency
exchange  rates.  For  example,  because  of  our  significant  manufacturing  operations  in  mainland  China,  a  weakening  RMB  is  advantageous  and  a  strengthening  RMB  is  disadvantageous  to  our
financial results. At this time, we have not established a formal hedging

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policy to attempt to reduce the inherent risks of potential currency fluctuations on our global operations. We report the impact of foreign exchange fluctuations in the other income (expense) line
item of our Consolidated Statements of Comprehensive Income statements. For 2023, 2022, and 2021, the effect of fluctuations of foreign currencies contributed realized gains (losses) of $(2.0)
million, 1.7 million, and ($0.6 million), respectively.

The mainland China government imposes significant exchange restrictions on fund transfers out of mainland China that are not related to business operations. To date these restrictions have not had
a material impact on us because we have not engaged in any significant transactions that are subject to the restrictions.

Interest Rate Risk

As of December 31, 2023, 2022, and 2021, the balance of our short term bank borrowings (see note 9 in the Notes to Consolidated Financial Statements included herein under “Item 8. Financial
Statements  and  Supplementary  Data.”),  mature  at  various  dates  within  the  following  year  and  do  not  expose  us  to  interest  rate  risk.  As  of  December  31,  2023,  the  balance  of  our  long-term
borrowings (see note 12 in the Notes to Consolidated Financial Statements included herein under “Item 8. Financial Statements and Supplementary Data.”) carries a fixed interest rated and we may
be exposed to fair value interest rate risk.

We have implemented policies and procedures to measure, manage, monitor and report risk exposures, which are reviewed regularly by management and the board of directors. We identify risk
exposures and monitor and manage such risks on an ongoing basis.

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Item 8.    Financial Statements and Supplementary Data

INDEX TO CONSOLIDATED FINANCIAL STATEMENTS

Consolidated Financial Statements

Report of Independent Registered Public Accounting Firm (Ernst & Young Hua Ming LLP, Shanghai, China, PCAOB ID#1408)

Report of Independent Registered Public Accounting Firm (Armanino LLP , San Ramon, CA, PCAOB ID#32)

Report of Independent Registered Public Accounting Firm (BDO China Shu Lun Pan Certified Public Accountants LLP, Shenzhen, China, PCAOB ID#1818)

Consolidated Balance Sheets as of December 31, 2023 and 2022

Consolidated Statements of Comprehensive Income (Loss) for the Years ended December 31, 2023, 2022, and 2021

Consolidated Statements of Changes in Stockholders’ Equity for the Years ended December 31, 2023, 2022, and 2021

Consolidated Statements of Cash Flows for the Years ended December 31, 2023, 2022, and 2021

Notes to Consolidated Financial Statements

Page

83

84

87

88

89

90

91

92

93

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To the Shareholders and the Board of Directors of ACM Research, Inc.

Opinion on the Financial Statements

Report of Independent Registered Public Accounting Firm

We  have  audited  the  accompanying  consolidated  balance  sheet  of  ACM  Research,  Inc.  (the  Company)  as  of  December  31,  2023,  the  related  consolidated  statements  of  comprehensive  income,
changes in stockholders' equity and cash flows for the year ended December 31, 2023, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the
consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2023, and the results of its operations and its cash flows for the year
ended December 31, 2023, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company's internal control over financial reporting as of
December 31, 2023, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework)
and our report dated February 28, 2024 expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company's management. Our responsibility is to express an opinion on the Company’s financial statements based on our audit. We are a
public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and
regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement, whether due to error or fraud. Our audit included performing procedures to assess the risks of material misstatement of the financial statements, whether
due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial
statements.  Our  audit  also  included  evaluating  the  accounting  principles  used  and  significant  estimates  made  by  management,  as  well  as  evaluating  the  overall  presentation  of  the  financial
statements. We believe that our audit provides a reasonable basis for our opinion.

Critical Audit Matter
The  critical  audit  matter  communicated  below  is  a  matter  arising  from  the  current  period  audit  of  the  financial  statements  that  was  communicated  or  required  to  be  communicated  to  the  audit
committee  and  that:  (1)  relates  to  accounts  or  disclosures  that  are  material  to  the  financial  statements  and  (2)  involved  our  especially  challenging,  subjective  or  complex  judgments.  The
communication of the critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit
matter below, providing separate opinions on the critical audit matter or on the accounts or disclosures to which it relates.

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Description of the Matter

Revenue Recognition
As described in Notes 2 to the consolidated financial statements, the Company recognizes revenue from tools and spare parts at a
point in time, when the Company has satisfied its performance obligation. For shipments made to a customer that has not previously
accepted a specific type of tool (“first tools”), revenues are recognized when the tools are accepted by the customer. For shipments
made to a customer that have previously accepted a specific type of tool (“repeat shipments”), revenues are recognized upon
shipment or delivery because the Company can objectively demonstrate that the tools meet all the required customer specifications.

Evaluating the sufficiency of audit evidence to validate whether the Company can objectively identify repeat shipments required
auditor judgment and significant audit effort because the Company’s tools are highly customized for each customer.

How We Addressed the
Matter in Our Audit

We obtained an understanding, evaluated the design and tested the operating effectiveness of controls over the Company’s revenue
process. For example, we tested the controls over management’s review of the Company’s analysis to determine whether the repeat
shipments identified have been previously accepted by the same customer.

To  test  whether  the  Company  can  objectively  demonstrate  that  the  highly  customized  tools  are  repeat  shipments,  our  audit
procedures,  among  others,  included  performing  direct  inquiries  with  the  Company’s  personnel  from  its  sales  and  engineering
department to understand the Company’s process of identifying repeat shipments and the quality control department to understand
the quality control process. We applied auditor judgment to determine the nature and extent of procedures to be performed by testing
all the sales transactions identified as repeat shipments during the year. Specifically for all repeat shipments, we obtained the quality
control  reports  signed  by  the  Company’s  quality  control  department.  We  also  identified  the  similar  tools  previously  sold  to  and
accepted by the same customer by comparing the executed contracts or purchase orders of both tools, and inspected the acceptance
confirmation  from  the  customer  of  the  previous  tools  to  verify  that  the  Company  was  able  to  objectively  demonstrate  that  repeat
shipments meet all the required customer specifications with its established history of customer acceptance. We evaluated the overall
sufficiency  of  audit  evidence  obtained  by  assessing  the  results  of  procedures  performed  over  repeat  shipments,  including  the
appropriateness of the nature and extent of audit effort.

/s/ Ernst & Young Hua Ming LLP

We have served as the Company's auditor since 2023.

Shanghai, the People’s Republic of China

February 28, 2024

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To the Shareholders and the Board of Directors of ACM Research, Inc.

Opinion on Internal Control Over Financial Reporting

Report of Independent Registered Public Accounting Firm

We have audited ACM Research, Inc.’s internal control over financial reporting as of December 31, 2023, based on criteria established in Internal Control—Integrated Framework issued by the
Committee  of  Sponsoring  Organizations  of  the  Treadway  Commission  (2013  framework)  (the  COSO  criteria).  In  our  opinion,  ACM  Research,  Inc.  (the  Company)  maintained,  in  all  material
respects, effective internal control over financial reporting as of December 31, 2023, based on the COSO criteria.

We  also  have  audited,  in  accordance  with  the  standards  of  the  Public  Company  Accounting  Oversight  Board  (United  States)  (PCAOB),  the  consolidated  balance  sheet  of  the  Company  as  of
December 31, 2023, the related consolidated statements of comprehensive income, changes in stockholders' equity and cash flows for the year ended December 31, 2023, and the related notes and
our report dated February 28, 2024 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting
included  in  the  accompanying  Management’s  Report  on  Internal  Control  Over  Financial  Reporting.  Our  responsibility  is  to  express  an  opinion  on  the  Company’s  internal  control  over  financial
reporting  based  on  our  audit.  We  are  a  public  accounting  firm  registered  with  the  PCAOB  and  are  required  to  be  independent  with  respect  to  the  Company  in  accordance  with  the  U.S.  federal
securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal
control over financial reporting was maintained in all material respects.

Our  audit  included  obtaining  an  understanding  of  internal  control  over  financial  reporting,  assessing  the  risk  that  a  material  weakness  exists,  testing  and  evaluating  the  design  and  operating
effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable
basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements
for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the
maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are
recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made
only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use,
or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject
to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young Hua Ming LLP

Shanghai, the People’s Republic of China

February 28, 2024

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To the Board of Directors and
Stockholders of ACM Research, Inc.

Opinion on the Consolidated Financial Statements

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We  have  audited  the  accompanying  consolidated  balance  sheet  of  ACM  Research,  Inc.  and  subsidiaries  (the  Company)  as  of  December  31,  2022,  and  the  related  consolidated  statements  of
comprehensive income (loss), changes in stockholders’ equity, and cash flows for the year ended December 31, 2022, and the related notes (collectively referred to as the consolidated financial
statements).  In  our  opinion,  the  consolidated  financial  statements  present  fairly,  in  all  material  respects,  the  financial  position  of  the  Company  as  of  December  31,  2022,  and  the  results  of  its
operations and its cash flows for the year ended December 31, 2022, in conformity with accounting principles generally accepted in the United States of America.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s consolidated financial statements based
on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the
applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated
financial  statements  are  free  of  material  misstatement,  whether  due  to  error  or  fraud.  Our  audit  included  performing  procedures  to  assess  the  risks  of  material  misstatement  of  the  consolidated
financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and
disclosures  in  the  consolidated  financial  statements.  Our  audit  also  included  evaluating  the  accounting  principles  used  and  significant  estimates  made  by  management,  as  well  as  evaluating  the
overall presentation of the consolidated financial statements. We believe that our audit provides a reasonable basis for our opinion.

/s/Armanino LLP

We served as the Company’s auditor in 2022. In 2023, we became the predecessor auditor.

San Ramon, California

March 1, 2023

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Report of Independent Registered Public Accounting Firm

To the Shareholders and Board of Directors
ACM Research, Inc.
Fremont, California

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated statements of operations and comprehensive income, changes in stockholders’ equity, and cash flows of ACM Research, Inc. and subsidiaries (the
“Company”) for the year ended December 31, 2021, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements
present fairly, in all material respects, the results of its operations and its cash flows for the year ended December 31, 2021, in conformity with accounting principles generally accepted in the United
States of America.

Basis for Opinion

These consolidated financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s consolidated financial statements based
on our audits. We are a public accounting firm registered with the Public Company Accounting Oversight Board (United States) (“PCAOB”) and are required to be independent with respect to the
Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the consolidated
financial statements are free of material misstatement, whether due to error or fraud.

Our  audits  included  performing  procedures  to  assess  the  risks  of  material  misstatement  of  the  consolidated  financial  statements,  whether  due  to  error  or  fraud,  and  performing  procedures  that
respond  to  those  risks.  Such  procedures  included  examining,  on  a  test  basis,  evidence  regarding  the  amounts  and  disclosures  in  the  consolidated  financial  statements.  Our  audits  also  included
evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the consolidated financial statements. We believe that our
audits provide a reasonable basis for our opinion.

/s/BDO China Shu Lun Pan Certified Public Accountants LLP

We served as the Company’s auditor from 2015 to 2022.

Shenzhen, The People’s Republic of China

March 1, 2022, except for the effects of the common stock split discussed in Notes 1 and 2 to the consolidated financial statements, as to which the date is March 1, 2023.

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Assets

Current assets:

Cash and cash equivalents (note 2)

Restricted cash

Short-term time deposits (note 2)

Short-term investments (note 15)

Accounts receivable, net (note 4)

Other receivables

Inventories, net (note 5)

Advances to related party (note 16)

Prepaid expenses

            Total current assets

Property, plant and equipment, net (note 6)

Land use right, net (note 7)

Operating lease right-of-use assets, net (note 11)

Intangible assets, net

Long-term time deposits (note 2)

Deferred tax assets (note 19)

Long-term investments (note 14)

Other long-term assets (note 8)

                        Total assets

Liabilities and Equity

Current liabilities:

Short-term borrowings (note 9)

Current portion of long-term borrowings (note 12)

Related party accounts payable (note 16)

Accounts payable

Advances from customers

Deferred revenue

Income taxes payable (note 19)

FIN-48 payable (note 19)

Other payables and accrued expenses (note 10)

Current portion of operating lease liability (note 11)

            Total current liabilities

Long-term borrowings (note 12)

Long-term operating lease liability (note 11)

Other long-term liabilities (note 13)

                       Total liabilities

Commitments and contingencies (note 21)

Equity:

Stockholders’ equity:

Class A Common stock (note 17)

Class B Common stock (note 17)

Additional paid-in capital

Retained earnings

Statutory surplus reserve (note 2)

Accumulated other comprehensive loss

Total ACM Research, Inc. stockholders’ equity

Non-controlling interests

Total equity

               Total liabilities and equity

ACM RESEARCH, INC.
Consolidated Balance Sheets
(In thousands, except per share data)

December 31,

2023

2022

$

182,090  $

1,083 

80,524 

21,312 

283,186 

40,065 

545,395 

2,432 

20,023 

1,176,110 

201,848 

8,367 

7,026 

2,538 

40,818 

20,271 

27,880 

6,050 

247,951 

500 

70,492 

20,209 

182,936 

29,617 

393,172 

3,322 

15,607 

963,806 

82,875 

8,692 

2,489 

1,255 

101,956 

6,703 

17,459 

50,265 

$

$

1,490,908  $

1,235,500 

31,335  $

6,783 

11,407 

141,814 

181,368 

3,687 

6,401 

12,149 

102,951 

2,764 

500,659 

53,952 

4,262 

5,873 

564,746 

6 

1 

629,845 

156,827 

30,060 

(49,349)

767,390 

158,772 

926,162 

56,004 

2,322 

14,468 

101,735 

153,773 

4,174 

3,469 

6,686 

52,201 

1,382 

396,214 

18,687 

1,107 

7,321 

423,329 

5 

1 

604,089 

94,426 

16,881 

(40,546)

674,856 

137,315 

812,171 

$

1,490,908  $

1,235,500 

The accompanying notes are an integral part of these consolidated financial statements.

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Table of Contents

ACM RESEARCH, INC.
Consolidated Statements of Comprehensive Income (Loss)

(In thousands, except per share data)

Revenue (note 3)

Cost of revenue, including cost of revenue from related party of $31,240 and $26,313 for the year ended December
31, 2023 and 2022, respectively (note 16)

Gross profit

Operating expenses:

Sales and marketing

Research and development

General and administrative

Total operating expenses

Income from operations

Interest income

Interest expense

Realized gain from sale of short-term investments

Unrealized gain (loss) on short-term investments

Other income (expense), net

Income from equity method investments

Income before income taxes

Income tax expense (note 19)

Net income

Less: Net income attributable to non-controlling interests

Net income attributable to ACM Research, Inc.

Comprehensive income (loss):

Net income

Foreign currency translation adjustment, net of tax

Comprehensive income (loss)

Less: Comprehensive income attributable to non-controlling interests

Comprehensive income (loss) attributable to ACM Research, Inc.

Net income per common stock (note 2):

Basic

Diluted

Weighted average common stock outstanding used in computing per share amounts (note 2):

Basic

Diluted

The accompanying notes are an integral part of these consolidated financial statements.

90

$

$

$

$

$

$

Year Ended December 31,

2023

2022

2021

557,723  $

281,508 

388,832  $

205,217 

276,215 

47,019 

92,709 

40,648 

180,376 

95,839 

8,354 

(2,681)

9,047 

(2,737)

(1,558)

9,952 

116,216 

(19,364)

96,852 

19,503 

183,615 

39,889 

62,226 

22,465 

124,580 

59,035 

8,740 

(1,655)

1,116 

(7,855)

3,315 

4,666 

67,362 

(16,798)

50,564 

11,301 

77,349  $

39,263  $

96,852  $

50,564  $

(10,617)

86,235 

17,689 

(59,102)

(8,538)

1,854 

68,546  $

(10,392) $

1.29  $

1.16  $

0.66  $

0.59  $

259,751 

144,895 

114,856 

26,733 

34,207 

15,214 

76,154 

38,702 

505 

(765)

— 

607 

(631)

4,637 

43,055 

(134)

42,921 

5,164 

37,757 

42,921 

4,695 

47,616 

5,607 

42,009 

0.65 

0.58 

60,164,670

64,870,543

59,235,975

65,341,771

57,654,708

65,356,716

 
 
 
 
 
 
 
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ACM RESEARCH, INC.
Consolidated Statement of Changes in Stockholders’ Equity
(In thousands, except per share data)

Common
Stock Class A

Common
Stock Class B

Shares

Amount

Shares

Amount

Additional Paid-
in Capital

Retained
Earnings

Statutory Surplus
Reserve

Accumulated Other
Comprehensive
Income (Loss)

Non-controlling
Interests

Total Equity

Balance at December 31, 2020

50,690,079 $

Net income

Appropriation to statutory surplus reserves

Foreign currency translation adjustment

Exercise of stock options

Stock-based compensation

Exercise of stock warrants

Conversion of Class B common stock to Class A
common stock

Proceeds from a subsidiary equity issuance

Balance at December 31, 2021

Net income

Appropriation to statutory surplus reserves

Foreign currency translation adjustment

Exercise of stock options

Stock-based compensation

Conversion of Class B common stock to Class A

common stock

Balance at December 31, 2022

Cumulative effect of change in accounting principle
under ASC 326, net of tax

Net income

Appropriation to statutory surplus reserves

Foreign currency translation adjustment

Exercise of stock options

Stock-based compensation

ACM Shanghai dividends

-

-

-

1,870,803

-

728,043

320,004

0

53,608,929

-

-

-

980,354

-

66,003

54,655,286

-

-

1,380,886

-

- 

Balance at December 31, 2023

56,036,172 $

5 

- 

- 

- 

- 

- 

- 

- 

- 

5 

- 

- 

- 

- 

- 

- 

5 

- 

- 

1 

- 

- 

6 

5,407,818 $

1  $

102,000  $

29,899  $

4,388  $

4,857  $

67,020  $

-

-

-

-

-

0

(320,004)

-

5,087,814

-

-

-

-

-

(66,003)

5,021,811

-

-

-

-

-

- 

- 

- 

- 

- 

- 

- 

- 

1 

- 

- 

- 

- 

- 

- 

1 

- 

- 

- 

- 

- 

- 

- 

- 

3,430 

5,117 

1,820 

- 

482,678 

595,045 

- 

- 

- 

1,314 

7,730 

- 

604,089 

- 

- 

2,303 

23,453 

- 

37,757 

(3,924)

- 

3,924 

- 

- 

- 

- 

- 

- 

63,732 

39,263 

(8,569)

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

8,312 

- 

8,569 

- 

- 

- 

- 

- 

- 

4,252 

- 

- 

- 

- 

- 

9,109 

- 

- 

(49,655)

- 

- 

- 

5,164 

- 

443 

- 

- 

- 

- 

62,834 

135,461 

11,301 

- 

(9,447)

- 

- 

- 

94,426 

16,881 

(40,546)

137,315 

(1,769)

77,349 

(13,179)

- 

- 

- 

- 

- 

13,179 

- 

- 

- 

- 

- 

19,503 

(8,803)

- 

- 

- 

(1,814)

3,834 

3,885 

(3,951)

5,021,811 $

1  $

629,845  $

156,827  $

30,060  $

(49,349) $

158,772  $

208,170 

42,921 

— 

4,695 

3,430 

5,117 

1,820 

— 

545,512 

811,665 

50,564 

- 

(59,102)

1,314 

7,730 

- 

812,171 

(1,769)

96,852 

(10,617)

6,138 

27,338 

(3,951)

926,162 

The accompanying notes are an integral part of these consolidated financial statements.

91

 
 
 
 
 
 
 
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ACM RESEARCH, INC.
Consolidated Statements of Cash Flows
(In thousands)

Cash flows from operating activities:

Net income

Adjustments to reconcile net income from operations to net cash used in operating
activities

Year Ended December 31,

2023

2022

2021

$

96,852  $

50,564  $

42,921 

Non-cash operating lease cost

Depreciation and amortization

Gain on disposals of property, plant and equipment

Realized gain on short-term investments

Income from equity method investments

Unrealized loss (gain) on short-term investments

Inventory provision

Provision for credit losses

Deferred income taxes

Stock-based compensation

Net changes in operating assets and liabilities:

Accounts receivable

Income tax recoverable

Other receivables

Inventories

Advances to related party (note 16)

Prepaid expenses

Other long-term assets

Related party accounts payable (note 16)

Accounts payable

Advances from customers

Deferred revenue

Income taxes payable

FIN-48 payable

Other payables and accrued expenses

Operating lease liabilities

Other long-term liabilities

Net cash used in operating activities

Cash flows from investing activities:

Purchase of property and equipment

Purchase of intangible assets

Purchase of long-term investments (note 14)

Purchase of short-term investments (note 15)

Purchase of time deposits

Proceeds from maturity of time deposits

Proceeds from sale of short-term investments (note 15)

Proceeds from disposal of long-term investments

Net cash used in investing activities

Cash flows from financing activities:

Proceeds from short-term borrowings

Repayments of short-term borrowings

Proceeds from long-term borrowings

Repayments of long-term borrowings

ACM Shanghai dividends

Proceeds from exercise of stock options

Proceeds from a subsidiary equity issuance, net of issuance costs

Proceeds from warrant exercise to common stock

Net cash provided by financing activities

Effect of exchange rate changes on cash, cash equivalents and restricted cash

Net increase (decrease) in cash, cash equivalents and restricted cash

Cash, cash equivalents and restricted cash at beginning of period

Cash, cash equivalents and restricted cash at end of period

Supplemental disclosure of cash flow information:

Interest paid, net of capitalized interest

Cash paid for income taxes

Reconciliation of cash, cash equivalents and restricted cash in consolidated statements
of cash flows:

Cash and cash equivalents

$

$

$

$

$

$

3,580 

8,092 

(2)

(9,047)

(9,952)

2,737 

575 

2,741 

(13,647)

27,338 

(108,749)

— 

(4,213)

(164,027)

890 

(5,075)

— 

(3,061)

42,343 

29,974 

2,693 

3,009 

5,463 

21,375 

(3,580)

(1,632)

2,816 

5,366 

(12)

(1,116)

(4,666)

7,855 

2,248 

— 

4,027 

7,730 

(88,655)

— 

(7,331)

(195,562)

(939)

(3,695)

3,986 

6,569 

17,501 

104,258 

994 

3,236 

4,404 

23,406 

(2,816)

(2,362)

2,451 

2,353 

— 

— 

(4,637)

(607)

75 

— 

(1,840)

5,117 

(47,624)

(1,082)

(8,420)

(127,731)

(776)

(9,830)

(4,521)

3,806 

61,405 

34,831 

226 

2,200 

10,551 

3,180 

(2,451)

310 

(75,323)

(62,194)

(40,093)

(61,876)

(2,462)

(7,508)

(18,356)

(26,120)

79,600 

21,735 

8,242 

(6,745)

31,334 

(55,068)

42,360 

(2,283)

(3,951)

6,138 

— 

— 

(91,094)

(1,426)

(5,279)

— 

(172,448)

— 

4,577 

— 

(9,153)

(559)

(1,568)

— 

— 

— 

— 

— 

(265,670)

(11,280)

56,004 

(9,224)

— 

(2,223)

- 

1,314 

— 

— 

18,530 

45,871 

(1,740) $

(32,623) $

(65,278) $

(314,616) $

248,451 

563,067 

183,173  $

248,451  $

22,884 

(39,809)

7,056 

(2,127)

— 

3,430 

545,512 

1,820 

538,766 

3,908 

491,301 

71,766 

563,067 

2,681  $

26,103  $

1,655  $

3,586  $

765 

1,132 

182 090 $

247 951 $

562 548

 
 
 
Cash and cash equivalents

Restricted cash

Cash, cash equivalents and restricted cash

Non-cash financing activities:

Cashless exercise of stock options

Non-cash investing activities:

Transfer from inventory to property, plant and equipment

Purchase property, plant and equipment through accounts payable and other payable

Transfer of prepayment for property to property, plant and equipment

$

$

$

$

$

$

182,090  $

247,951  $

562,548 

1,083 

500 

519 

183,173  $

248,451  $

563,067 

333  $

221  $

137 

4,379  $

33,750  $

—  $

—  $

—  $

41,497  $

— 

— 

— 

The accompanying notes are an integral part of these consolidated financial statements.

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Table of Contents

ACM RESEARCH, INC.
Notes to Consolidated Financial Statements
(in thousands, except share and per share data)

NOTE 1 – DESCRIPTION OF BUSINESS

ACM  Research,  Inc.  (“ACM”  or  "ACM  Research")  and  its  subsidiaries  (collectively  with  ACM,  the  “Company”)  develop,  manufacture  and  sell  single-wafer  wet  cleaning  equipment  used  to
improve the manufacturing process and yield for advanced integrated chips. The Company markets and sells its single-wafer wet-cleaning equipment, under the brand name “Ultra C,” based on the
Company’s proprietary Space Alternated Phase Shift (“SAPS”) and Timely Energized Bubble Oscillation (“TEBO”) technologies. These tools are designed to remove random defects from a wafer
surface efficiently, without damaging the wafer or its features, even at increasingly advanced process nodes.

ACM  was  incorporated  in  California  in  1998,  and  it  initially  focused  on  developing  tools  for  manufacturing  process  steps  involving  the  integration  of  ultra-low-K  materials  and  copper.  The
Company’s early efforts focused on stress-free copper-polishing technology, and it sold tools based on that technology in the early 2000s.

In 2006, the Company established its operational center in Shanghai in the People’s Republic of China ("mainland China"), where it operates through ACM’s subsidiary, ACM Research (Shanghai),
Inc.  (“ACM  Shanghai”).  ACM  Shanghai  was  formed  to  help  establish  and  build  relationships  with  integrated  circuit  manufacturers  in  mainland  China,  and  the  Company  initially  financed  its
Shanghai operations in part through sales of non-controlling equity interests in ACM Shanghai.

In  2007,  the  Company  began  to  focus  its  development  efforts  on  single-wafer  wet-cleaning  solutions  for  the  front-end  chip  fabrication  process.  The  Company  introduced  its  SAPS  megasonic
technology, which can be applied in wet wafer cleaning at numerous steps during the chip fabrication process, in 2009. It introduced its TEBO technology, which can be applied at numerous steps
during the fabrication of small node two-dimensional conventional and three-dimensional patterned wafers, in March 2016. The Company has designed its equipment models for SAPS and TEBO
solutions  using  a  modular  configuration  that  enables  it  to  create  a  wet-cleaning  tool  meeting  the  specific  requirements  of  a  customer,  while  using  pre-existing  designs  for  chamber,  electrical,
chemical delivery and other modules. In August 2018, the Company introduced its Ultra-C Tahoe wafer cleaning tool, which can deliver high cleaning performance with significantly less sulfuric
acid than typically consumed by conventional high-temperature single-wafer cleaning tools. Based on its electro-chemical plating (“ECP”) technology, the Company introduced in March 2019 its
Ultra ECP AP, or “Advanced Packaging,” tool for bumping, or applying copper, tin and nickel to semiconductor wafers at the die-level, and its Ultra ECP MAP, or “Multi-Anode Partial Plating,”
tool to deliver advanced electrochemical copper plating for copper interconnect applications in front-end wafer fabrication processes. The Company also offers a range of custom-made equipment,
including cleaners, coaters and developers, to back-end wafer assembly and packaging factories, principally in mainland China.

In 2011, ACM Shanghai formed a wholly owned subsidiary in mainland China, ACM Research (Wuxi), Inc. (“ACM Wuxi”), to manage sales and service operations.

In November 2016, ACM re-domesticated from California to Delaware pursuant to a merger in which ACM Research, Inc., a California corporation, was merged into a newly formed, wholly owned
Delaware subsidiary, also named ACM Research, Inc.

In June 2017, ACM formed a wholly owned subsidiary in Hong Kong, CleanChip Technologies Limited (“CleanChip”), to act on the Company’s behalf in Asian markets outside mainland China by,
for  example,  serving  as  a  trading  partner  between  ACM  Shanghai  and  its  customers,  procuring  raw  materials  and  components,  performing  sales  and  marketing  activities,  and  making  strategic
investments.

In August 2017, ACM purchased 18.77% of ACM Shanghai’s equity interests held by Shanghai Science and Technology Venture Capital Co., Ltd. On November 8, 2017, ACM purchased the
remaining 18.36% of ACM Shanghai’s equity interest held by third parties, Shanghai Pudong High-Tech Investment Co., Ltd. (“PDHTI”) and Shanghai Zhangjiang Science & Technology Venture
Capital Co., Ltd. (“ZSTVC”). At December 31, 2017, ACM owned all of the outstanding equity interests of ACM Shanghai, and indirectly through ACM Shanghai, owned all of the outstanding
equity interests of ACM Wuxi.

On November 2, 2017, the Registration Statement on Form S-1 (File No. 333- 220451) for ACM’s initial public offering of Class A common stock (the “IPO”) was declared effective by the U.S.
Securities and Exchange Commission. Shares of

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Class A common stock began trading on the Nasdaq Global Market on November 3, 2017, and the closing for the IPO was held on November 7, 2017.

In December 2017, ACM formed a wholly owned subsidiary in the Republic of Korea (“Korea”), ACM Research Korea CO., LTD. (“ACM Korea”), to serve customers based in Korea and perform
sales, marketing, research and development activities for new products and solutions.

In March 2019, ACM Shanghai formed a wholly owned subsidiary in mainland China, Shengwei Research (Shanghai), Inc. (“ACM Shengwei”), to manage activities related to the addition of future
long-term production capacity.

In June 2019, CleanChip formed a wholly owned subsidiary in California, ACM Research (CA), Inc. (“ACM California”), to provide procurement services on behalf of ACM Shanghai.

In June 2019, ACM announced plans to complete over the next three years a listing (the “STAR Listing”) of shares of ACM Shanghai on the Shanghai Stock Exchange’s new SciTech innovAtion
boaRd, known as the STAR Market, and a concurrent initial public offering (the “STAR IPO”) of ACM Shanghai shares in mainland China. ACM Shanghai is currently ACM’s primary operating
subsidiary, and at the time of announcement, was wholly owned by ACM. To meet a STAR Listing requirement that it have multiple independent stockholders in mainland China, ACM Shanghai
completed private placements of its shares in June and November 2019, following which, as of September 30, 2020, the private placement investors held a total of 8.3% of the outstanding shares of
ACM  Shanghai  and  ACM  Research  held  the  remaining  91.7%.  As  part  of  the  STAR  Listing  process,  in  June  2020  the  ownership  interests  held  by  the  private  investors  were  reclassified  from
redeemable non-controlling interests to non-controlling interests as the redemption feature was terminated. In preparation for the STAR IPO, ACM completed a reorganization in December 2020
that included the sale of all of the shares of CleanChip by ACM to ACM Shanghai for $3,500. The reorganization and sale had no impact on ACM’s consolidated financial statements.

In August 2021, ACM formed a wholly owned subsidiary in Singapore, ACM research (Singapore) PTE, Ltd. to perform sales, marketing, and other business development activities.

In November 2021, ACM’s operating subsidiary ACM Shanghai, completed its STAR IPO and its shares began trading on the STAR Market. In the STAR IPO, ACM Shanghai issued 43,355,753
shares, representing 10% of the total 433,557,100 shares outstanding after the issuance. The shares were issued at a public offering price of RMB 85.00 per share, and the net proceeds of the STAR
IPO, after issuance costs, totaled $545,512. Upon completion of the STAR IPO, ACM owned 82.5% of the outstanding ACM Shanghai shares. However, in May 2023, ACM's ownership declined to
82.1% due to the exercise of 2,150,309 stock options related to ACM Shanghai shares.

In  February  2022,  ACM  Shanghai  formed  a  wholly  owned  subsidiary  in  China,  ACM  Research  (Beijing),  Inc.  (“ACM  Beijing”),  to  perform  sales,  marketing  and  other  business  development
activities.

In March 2022, ACM formed a wholly owned subsidiary in Korea, Hanguk ACM CO., LTD, to perform business development and other related activities.

In March 2022, the Board of Directors of ACM declared a 3-for-1 stock split of Class A and Class B common stock effected in the form of a stock dividend (the “Stock Split”). Each stockholder of
record at the close of business on March 16, 2022, received a dividend of two additional shares of Class A common stock for each then-held share of Class A common stock and two additional
shares of Class B common stock for each then-held share of Class B common stock, which were distributed after the close of trading on March 23, 2022. Unless otherwise indicated, all share
numbers, per share amount, share prices, exercise prices and conversion rates set forth in these notes and the accompanying consolidated financial statements have been adjusted retrospectively to
reflect the Stock Split.

In  June  2023,  ACM  Shanghai  formed  a  wholly-owned  subsidiary  in  mainland  China,  Yusheng  Micro  Semiconductor  (Shanghai),  Co.,  Ltd,  ("Yusheng  Micro")  to  perform  business  development
activities.

In June 2023, Yusheng Micro together with Wooil Flucon Co. (note 14) and a private investor established ACM-Wooil Microelectronics (Shanghai) Co., Ltd, ("ACM-Wooil"), a partially owned
subsidiary based in mainland China to develop and produce key components for the semiconductor equipment industry.

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The Company has direct or indirect interests in the following subsidiaries:

Name of subsidiaries

ACM Research (Shanghai), Inc.

ACM Research (Wuxi), Inc.

CleanChip Technologies Limited

ACM Research Korea CO., LTD.

ACM Research (Lingang), Inc. (1)

ACM Research (CA), Inc.

ACM Research (Cayman), Inc.

ACM Research (Singapore) PTE. Ltd.

ACM Research (Beijing), Inc.

Hanguk ACM CO., LTD

Yusheng Micro Semiconductor (Shanghai) Co., Ltd.

ACM-Wooil Microelectronics (Shanghai) Co., Ltd.

Place and date of
incorporation

Mainland China, May 2005

Mainland China, July 2011

Hong Kong, June 2017

Korea, December 2017

Mainland China, March 2019

USA, April 2019

Cayman Islands, April 2019

Singapore, August 2021

Mainland China, February 2022

Korea, March 2022

Mainland China, June 2023

Mainland China, June 2023

Effective interest held as at
December 31,

2023

82.1%

82.1%

82.1%

82.1%

82.1%

82.1%

100.0%

100.0%

82.1%

100.0%

82.1%

59.4%

2022

82.5%

82.5%

82.5%

82.5%

82.5%

82.5%

100.0%

100.0%

82.5%

100.0%

-

-

(1) ACM Research (Lingang) Inc., or ACM Lingang, is the English name referred to by its Chinese language name Shengwei Research (Shanghai), Inc. in prior filings. ACM Research (Lingang),
Inc. and Shengwei Research (Shanghai), Inc. refer to the same entity.

NOTE 2 – SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation and Principles of Consolidation

The Company’s consolidated financial statements include the accounts of ACM and its subsidiaries, including ACM Shanghai and its subsidiaries. ACM’s subsidiaries are those entities in which
ACM, directly and indirectly, controls more than a majority of the voting power. All significant intercompany transactions and balances have been eliminated upon consolidation. The consolidated
financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”)

Use of Estimates

The preparation of the condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and
liabilities  and  disclosure  of  contingent  assets  and  liabilities  at  the  balance  sheet  date  and  the  reported  revenues  and  expenses  during  the  reported  period  in  the  condensed  consolidated  financial
statements and accompanying notes. The Company’s significant accounting estimates and assumptions include, but are not limited to, those used for revenue recognition and deferred revenue, the
valuation and recognition of fair value of certain short-term and long-term investments, stock-based compensation arrangements, realization of deferred tax assets, assessment for impairment of
long-lived assets and long-term investments, allowance for credit losses, inventory valuation, useful lives of property, plant and equipment and useful lives of intangible assets.

Management evaluates these estimates and assumptions on a regular basis. Actual results could differ from those estimates and assumptions.

Common Stock Split
All prior period share and per share amounts and common stock presented in the accompanying financial statements and these notes thereto has been retroactively adjusted to reflect the impact of
the Stock Split. Proportional adjustments were also made to outstanding awards under the Company’s stock-based compensation plans.

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Reclassifications

Certain  prior  year  amounts  in  the  consolidated  financial  statements  have  been  reclassified  to  conform  with  the  current  year  presentation.  These  classifications  had  no  impact  on  the  Company’s
results of operations.

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand and bank deposits that are unrestricted as to withdrawal and use, and highly liquid investments with an original maturity date of three months or
less at the date of purchase. At times, cash deposits may exceed government-insured limits.

The following table presents cash and cash equivalents, according to jurisdiction as of December 31, 2023 and 2022:

United States

Mainland China

China Hong Kong

Korea

Singapore

Total

December 31,

2023

2022

$

$

43,614  $

70,418 

64,057 

3,934 

67 

182,090  $

25,011 

129,695 

89,187 

4,007 

51 

247,951 

The amounts in mainland China do not include short-term and long-term time deposits which totaled $121,342 and $172,448 at December 31, 2023 and 2022, respectively.

Cash held in the U.S. exceeds the Federal Deposit Insurance Corporation (“FDIC”) insurance limits and is subject to risk of loss. No losses have been experienced to date.

Cash amounts at the banks in mainland China are subject to a series of risk control regulatory standards from mainland China bank regulatory authorities. ACM’s subsidiaries in mainland China are
required to obtain approval from the State Administration of Foreign Exchange (“SAFE”) to transfer funds into or out of mainland China. SAFE requires a valid agreement to approve the transfers,
which are processed through a bank. Other than these mainland China foreign exchange restrictions, ACM’s subsidiaries in mainland China are not subject to any mainland China restrictions and
limitations on its ability to transfer funds to ACM Research or among our other subsidiaries. However, cash held by ACM’s subsidiaries in mainland China does exceed applicable insurance limits
and is subject to risk of loss, although no such losses have been experienced to date.

ACM  California  periodically  procures  goods  and  services  on  behalf  of  ACM  Shanghai.  For  these  transactions,  ACM  Shanghai  makes  cash  payments  to  ACM  California  in  accordance  with
applicable transfer pricing arrangements. For the years ended December 31, 2023 and December 31, 2022, cash payments from ACM Shanghai to ACM California for the procurement of goods and
services were $42.5 million and $30.2 million, respectively. ACM California periodically borrows funds for working capital advances from its direct parent, CleanChip. ACM California repays or
renews these intercompany loans in accordance with their terms.

For sales through CleanChip and ACM Research, a certain amount of sales or advance payments from customer proceeds is repatriated back to ACM Shanghai, a subsidiary, in accordance with
applicable transfer pricing arrangements in the ordinary course of business. ACM Research provides services to certain customers located in the U.S., Europe and other regions outside of mainland
China  to  support  the  evaluation  of  first  tools  and  provide  support  for  tools  under  warranty  on  behalf  of  ACM  Shanghai.  For  these  transactions,  ACM  Shanghai  makes  cash  payments  to  ACM
Research in accordance with applicable transfer pricing arrangements.

For the year ended December 31, 2023, ACM Shanghai paid $19,200 in dividends to ACM Research.

Subsequent to June 30, 2020, with the exception of sales and services-related transfer-pricing payments in the ordinary course of business, and dividends paid by ACM Shanghai to ACM Research,
no cash transfers or other payments or distributions have been made between ACM Research and ACM Shanghai. ACM Research intends to retain any future

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earnings to finance the operations and expenses of the business, and do not expect to distribute earnings or declare or pay any dividends in the foreseeable future.

Amounts held in Korea exceed the Korea Deposit Insurance Corporation (“KDIC”) insurance limits and are subject to risk of loss. No losses have been experienced to date.

There is no additional restriction for the transfer of cash from bank accounts in the U.S., Korea, Singapore, and Hong Kong.

Time Deposits

Time deposits are deposited with banks in mainland China with fixed terms and interest rates which cannot be withdrawn before maturity, and are presented as short-term deposits and long-term
deposits in the consolidated financial statements based on their expected time of collection. They are also subject to the risk control regulatory standards described above upon maturity. Time
deposits consisted of the following:

Deposit in China Merchant Bank which matured on January 29, 2023 with an annual interest rate of 2.25%

$

Deposit in China Everbright Bank which matured on January 29, 2023 with an annual interest rate of 2.25%

Deposit in China Everbright Bank which matured on May 22, 2023 with an annual interest rate of 5.07%

Deposit in China Industrial Bank which matured on January 30, 2023 with an annual interest rate of 2.15%

Deposit in China Merchant Bank which matured on January 29, 2024 with an annual interest rate of 2.85%

Deposit in Bank of Ningbo which matured on February 17, 2024 with an annual interest rate of 2.85%

Deposit in Shanghai Pudong Development Bank which matures on October 20, 2025 with an annual interest rate of 3.10%

Deposit in Shanghai Pudong Development Bank which matures on November 14, 2025 with an annual interest rate of 3.10%

Deposit in Shanghai Pudong Development Bank which matures on December 8, 2025 with an annual interest rate of 3.10%

Deposit in Shanghai Pudong Development Bank which matures on December 15, 2025 with an annual interest rate of 3.10%

Deposit in Shanghai Pudong Development Bank which matures on December 30, 2025 with an annual interest rate of 3.10%

Deposit in China Industrial Bank which matures on January 30, 2026 with an annual interest rate of 3.15%

Deposit in China Everbright Bank which matured on January 5, 2024 with an annual interest rate of 5.38%

Deposit in China Everbright Bank which matures on May 22, 2024 with an annual interest rate of 5.38%

December 31,

2023

2022

—  $

— 

— 

— 

29,797 

44,630 

7,322 

7,307 

4,376 

4,373 

2,912 

14,528 

3,079 

3,018 

38,772 

14,360 

3,000 

14,360 

28,720 

43,080 

7,180 

7,180 

4,308 

4,308 

7,180 

— 

— 

— 

$

121,342  $

172,448 

For the years ended December 31, 2023 and 2022, respectively, interest income related to time deposits was $3,689 and $3,472, respectively.

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Accounts Receivable

Prior to adoption of Accounting Standards Update, or ASU, 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASC 326”), the
Company reviews its accounts receivable on a periodic basis and makes general and specific allowances when there is doubt as to the collectability of individual balances. After adoption of ASC
326,  as  of  January  1,  2023,  the  Company  assesses  collectability  by  reviewing  accounts  receivable  on  a  collective  basis  where  similar  characteristics  exist  and  on  an  individual  basis  when  the
Company identifies specific customers with known disputes or collectability issues. In determining the amount of the allowance for credit losses, the Company considers historical collectability
based on past due status, the age of the accounts receivable balances, credit quality of the Company’s customers based on ongoing credit evaluations, current economic conditions, reasonable and
supportable forecasts of future economic conditions, and other factors that may affect the Company’s ability to collect from customers. At December 31, 2023, and 2022, the Company, based on a
review of its outstanding balances and its customers, determined the allowance for credit losses were $4,830 and $0, respectively.

Land Use Right, Net

The land use right represents the cost to purchase a right to use state-owned land in mainland China with lease terms of 50 years expiring in 2070, for which an upfront lump-sum payment was made
during the year ended December 31, 2021. The land use rights are treated as operating lease. The Company classifies the land use right as non-current assets on the consolidated balance sheets (note
7).

Inventory

Inventory consists of raw materials and related goods, work-in-progress, finished goods, and other consumable materials such as spare parts.

Inventory was recorded at the lower of cost or net realizable value at December 31, 2023 and 2022.

•

•

The cost of a general inventory item is determined using the moving weighted average method. The cost of an inventory item purchased specifically for a customized product is determined
using the specific identification method. Low-cost consumable materials and packaging materials are expensed as incurred.
Net realizable value is the estimated selling price, in the ordinary course of business, less estimated costs to complete or dispose.

The Company assesses the recoverability of all inventories quarterly to determine if any adjustments are required. Potential excess or obsolete inventory is written down based on management’s
analysis of inventory levels and estimates of future 12-month demand and market conditions.

Property, Plant and Equipment, Net

Property, plant and equipment are recorded at cost less accumulated depreciation and any provision for impairment in value. Depreciation begins when the asset is placed in service and is calculated
by using the straight-line method over the estimated useful life of an asset (or, if shorter, over the lease term). Betterments or renewals are capitalized when incurred.

Estimated useful lives of assets are as follows:

Buildings and plants

Computer and office equipment

Furniture and fixtures

Leasehold improvements

Electronic equipment

Manufacturing equipment

30 years

3 to 5 years

5 years

shorter of lease term or estimated useful life

3 to 5 years

for small to medium-sized equipment, 5 to 10 years; for large equipment,
estimated by purchasing department at time of acceptance

Transportation equipment

4 to 5 years

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Expenditures for maintenance and repairs that neither materially add to the value of the property nor appreciably prolong the life of the property are charged to expense as incurred. Upon retirement
or sale of an asset, the cost of the asset and the related accumulated depreciation are eliminated from the accounts and any resulting gain or loss is credited or charged to income.

Intangible Assets, Net

Intangible assets consist of purchase software. Assets are valued at cost at the time of acquisition and are amortized over their beneficial periods.

Valuation of Long-Lived Assets

Long-lived assets are evaluated for impairment whenever events or changes in circumstance indicate that the carrying value of the assets may not be fully recoverable or that the useful life of the
assets is shorter than the Company had originally estimated. When these events or changes occur, the Company evaluates the impairment of the long-lived assets by comparing the carrying value of
the assets to an estimate of future undiscounted cash flows expected to be generated from the use of the assets and their eventual disposition. If the sum of the expected future undiscounted cash
flows is less than the carrying value of the assets, the Company recognizes an impairment loss based on the excess of the carrying value over the fair value. No impairment charge was recognized
for either of the periods presented.

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in operating lease right-of-use (“ROU”) assets, and operating lease liabilities in the consolidated
balance sheets.

ROU assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease.
Operating lease ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide
an implicit rate, the Company uses its incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. The Company uses
the implicit rate when readily determinable. The operating lease ROU asset also includes any lease payments made and excludes lease incentives. The Company’s lease terms may include options to
extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Operating lease expense is recognized on a straight-line basis over the lease term.

Revenue Recognition

The Company derives revenue principally from the sale of semiconductor capital equipment. Revenue from contracts with customers is recognized using the following five steps pursuant ASC
Topic 606, Revenue from Contracts with Customers:

1.
2.
3.
4.
5.

Identify the contract(s) with a customer;
Identify the performance obligations in the contract;
Determine the transaction price;
Allocate the transaction price to the performance obligations in the contract; and
Recognize revenue when (or as) the entity satisfies a performance obligation.

Identify  the  contract(s)  with  a  customer.  The  Company  generally  considers  written  documentation  including,  but  not  limited  to,  signed  purchase  orders,  master  agreements,  and  sales  orders  as
contracts, provided it has approval and commitment from the customer, the rights of the parties are identified, payment terms are identified, the contract has commercial substance, and collection is
probable. Collectability is assessed based on management’s assessment of the customer’s creditworthiness, historical payment experience, as well as other relevant factors.

Identify the performance obligations in the contract. Performance obligations are accounted for separately if they are distinct. A good or service is distinct if the customer can benefit from the good
or service either on its own or together with other resources that are readily available to the customer, and the good or service is distinct in the context of the contract. The Company’s performance
obligations generally include sales of tools and spare parts. In addition, customer contracts can contain provisions for installation, training, software updates, most-favored pricing for spare parts,
and other items which have been deemed immaterial in the context of the contract.

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Determine the transaction price. The transaction price for the Company’s contracts with customers may include fixed and variable consideration. The Company includes variable consideration in
the transaction price to the extent that it is probable that a significant reversal of revenue will not occur in the future based on the Company’s historical experience with similar arrangements.

Allocate  the  transaction  price  to  the  performance  obligations  in  the  contract.  For  contracts  that  contain  multiple  performance  obligations,  the  Company  allocates  the  transaction  price  to  the
performance obligations on a relative standalone selling price basis. The Company defers revenue associated with spare parts, sold together with its tools, based on its stand-alone observable selling
prices or using an expected cost-plus-margin approach when a stand-alone selling price is not directly observable, and recognizes revenue upon subsequent delivery.

Recognize  revenue  when,  or  as,  a  performance  obligation  is  satisfied.  The  Company  recognizes  revenue  from  tools  and  spare  parts  at  a  point  in  time,  when  the  Company  has  satisfied  its
performance obligation. The Company’s sales arrangements do not include a general right of return. For shipments made to a customer that has not previously accepted a specific type of tool (“first
tools”), revenues are recognized when the tools are accepted by the customer. For shipments made to a customer that has previously accepted a specific type of tool ("repeat shipment"), revenues are
recognized upon shipment or delivery because the Company can objectively demonstrate that the tools meet all the required customer specifications.

The  Company’s  warranties  provide  assurance  that  its  products  will  function  as  expected  and  in  accordance  with  certain  specifications.  The  Company’s  warranties  are  intended  to  safeguard  the
customer against existing defects and do not provide any incremental service to the customer. They are not separate performance obligations and are accounted for under FASB ASC Topic 460,
Guarantees.

Contract liabilities include payments received from customers prior to the transfer of control of certain goods which are recorded as advances from customers, and spare parts sold together with its
tools which are recorded as deferred revenue. The Company does not have contract assets.

Cost of Revenue

Cost of revenue primarily consists of: direct materials, comprised principally of parts used in assembling equipment, together with crating and shipping costs; direct labor, including salaries and
other labor related expenses attributable to the Company’s manufacturing department; allocated overhead cost, such as personnel cost, depreciation expense, expenses associated with supply chain
management and quality assurance activities, inventory provision, as well as shipping insurance premiums.

Research and Development Costs

Research and development costs relating to the development of new products and processes, significant improvements and refinements to existing products or the process of supporting customer
evaluations of tools, and the development of new tools for evaluation by customers during the product demonstration process, are expensed as incurred.

Shipping and Handling Costs

Shipping and handling costs, which relate to transportation of products to customer locations, are charged to selling and marketing expense. For the years ended December 31, 2023, 2022 and 2021,
shipping and handling costs included in sales and marketing expenses were $1,582, $1,507, and $923, respectively.

Borrowing Costs

Borrowing  costs  attributable  directly  to  the  acquisition,  construction  or  production  of  qualifying  assets  that  require  a  substantial  period  of  time  to  be  ready  for  their  intended  use  or  sale  are
capitalized as part of the cost of those assets. Income earned on temporary investments of specific borrowings pending their expenditure on those assets is deducted from borrowing costs capitalized.
All other borrowing costs are recognized in interest expense in the consolidated statements of comprehensive income (loss) in the period in which they are incurred.

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Warranty

For each of its products, the Company generally provides a standard assurance type warranty ranging from 12 to 36 months and covering replacement of the product during the warranty period. The
Company  accounts  for  the  estimated  warranty  costs  at  the  time  revenue  is  recognized.  Warranty  obligations  are  affected  by  historical  failure  rates  and  associated  replacement  costs.  Utilizing
historical warranty cost records, the Company calculates a rate of warranty expenses to revenue to determine the estimated warranty charge. The Company updates these estimated charges on a
regular  basis.  Warranty  obligations  are  included  in  other  payables  and  accrued  expenses  in  the  consolidated  balance  sheets.  The  following  table  shows  changes  in  the  Company’s  warranty
obligations for the years ended December 31, 2023, 2022 and 2021, respectively.

Balance at beginning of period

Additions

Utilized

Balance at end of period

Government Subsidies

Year Ended December 31,

2023

2022

2021

$

$

8,780  $

7,969 

(6,915)

9,834  $

6,631  $

5,379 

(3,230)

8,780  $

3,975 

5,026 

(2,370)

6,631 

ACM Shanghai has received seven special government grants. The governmental grants contain certain operating conditions, and the Company is required to go through a government due diligence
process once the project is complete. Unearned government subsidies received are deferred and recorded as other long-term liabilities (note 13) in the consolidated balance sheet until the criteria for
such recognition are satisfied. Grant amounts are recognized in our statements of comprehensive income (loss) as follows:

•

•

Government  subsidies  relating  to  current  expenses  are  recorded  as  reductions  of  those  expenses  in  the  periods  in  which  the  current  expenses  are  recorded.  For  the  years  ended
December 31, 2023, 2022, and 2021, related government subsidies recognized as reductions of relevant expenses in the consolidated statements of comprehensive income (loss) were
$1,740, $1,201 and $11,260, respectively.
Government subsidies related to depreciable assets are credited to income over the useful lives of the related assets for which the grant was received. For the years ended December 31,
2023, 2022, and 2021, related government subsidies recognized as other income in the consolidated statements of comprehensive income (loss) were $533, $306, and $200, respectively.

Stock-based Compensation

ACM  and  ACM  Shanghai  grants  stock  options  to  employees  and  non-employee  consultants  and  directors  and  accounts  for  those  stock-based  awards  in  accordance  with  FASB  ASC  Topic  718,
Compensation – Stock Compensation.

Stock-based  awards  granted  to  employees  and  non-employee  consultants  and  directors  are  measured  at  the  fair  value  of  the  awards  on  the  grant  date  and  are  recognized  as  expenses  either  (a)
immediately on grant, if no vesting conditions are required or (b) using the graded vesting method, net of estimated forfeitures, over the requisite service period. The fair value of stock options is
determined using the Black-Scholes valuation model when there are service and performance condition attached or the Monte Carlo valuation model when there is market condition attached. Stock-
based compensation is charged to the category of operating expense corresponding to the service function of the employees and non-employee consultants and directors.

Income Taxes

The Company accounts for income taxes using the liability method whereby deferred tax asset and liability account balances are determined based on differences between the financial reporting and
tax  bases  of  assets  and  liabilities  and  are  measured  using  the  enacted  tax  rates  and  laws  that  will  be  in  effect  when  the  differences  are  expected  to  reverse.  The  Company  provides  a  valuation
allowance, if necessary, to reduce deferred tax assets to their estimated realizable values.

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In  evaluating  the  ability  to  recover  its  deferred  income  tax  assets,  the  Company  considers  all  available  positive  and  negative  evidence,  including  its  operating  results,  ongoing  tax  planning  and
forecasts of future taxable income on a jurisdiction-by-jurisdiction basis. In the event the Company determines that it would be able to realize its deferred income tax assets in the future in excess of
their net recorded amount, it would make an adjustment to the valuation allowance that would reduce the provision for income taxes. Conversely, in the event that all or part of the net deferred tax
assets are determined not to be realizable in the future, an adjustment to the valuation allowance would be charged to earnings in the period such determination is made.

Tax benefits related to uncertain tax positions are recognized when it is more likely than not that a tax position will be sustained during an audit. Interest and penalties related to unrecognized tax
benefits are included within the provision for income tax.

Basic and Diluted Net Income per Share of Common Stock

Basic and diluted net income per share of common stock is calculated as follows:

Numerator:

Net income

Less: Net income attributable to non-controlling interests

Net income available to common stockholders, basic

Less: Dilutive effect arising from stock-based awards by ACM Shanghai

Net income available to common stockholders, diluted

Weighted average shares outstanding, basic (1)

Effect of dilutive securities

Weighted average shares outstanding, diluted

Net income per share of common stock:

Basic

Diluted

Year Ended December 31,

2023

2022

2021

96,852  $

19,503 

77,349  $

1,841 

75,508  $

60,164,670

4,705,873

64,870,543

50,564  $

11,301 

39,263  $

584 

38,679  $

59,235,975

6,105,796

65,341,771

42,921 

5,164 

37,757 

108 

37,649 

57,654,708

7,702,008

65,356,716

1.29  $

1.16  $

0.66  $

0.59  $

0.65 

0.58 

$

$

$

$

$

(1)

The results for 2021 have been adjusted to reflect the three-for-one stock split effected in the form of a stock dividend in March 2022. See Note 2 for details.

Basic and diluted net income per share of common stock is presented using the two-class method, which allocates undistributed earnings to common stock and any participating securities according
to dividend rights and participation rights on a proportionate basis. Under the two-class method, basic net income per share of common stock is computed by dividing the sum of distributed and
undistributed earnings attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. ACM did not have any participating securities
outstanding during the three-year periods ending December 31, 2023.

ACM has been authorized to issue Class A and Class B common stock since redomesticating in Delaware in November 2016. The two classes of common stock are substantially identical in all
material  respects,  except  for  voting  rights.  Since  ACM  did  not  declare  any  dividends  during  the  years  ended  December  31,  2023,  2022  and  2021,  the  net  income  per  share  of  common  stock
attributable  to  each  class  is  the  same  under  the  “two-class”  method.  As  such,  the  two  classes  of  common  stock  have  been  presented  on  a  combined  basis  in  the  consolidated  statements  of
comprehensive income (loss) and in the above computation of net income per share of common stock.

Diluted net income per share of common stock reflects the potential dilution from securities, including stock options, that could share in ACM’s earnings. Certain potential dilutive securities were
excluded from the net income per share calculation because the impact would be anti-dilutive. The number of potentially dilutive shares that were not included in

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the calculation of diluted net income per share in the periods presented where their inclusion would be anti-dilutive were 3,651,337, 1,795,340 and 98,800 the years ended December 31, 2023, 2022,
and 2021, respectively.

Comprehensive Income (loss)

The Company applies FASB ASC Topic 220, Comprehensive Income, which establishes standards for the reporting and display of comprehensive income or loss, requiring its components to be
reported  in  a  financial  statement  with  the  same  prominence  as  other  financial  statements.  The  Company’s  comprehensive  income  (loss)  includes  net  income  and  foreign  currency  translation
adjustments and is presented in the consolidated statements of comprehensive income (loss).

Statutory Surplus Reserve

The  income  of  ACM’s  mainland  China  subsidiaries  is  distributable  to  their  shareholders  after  transfers  to  reserves  as  required  under  relevant  mainland  China  laws  and  regulations  and  the
subsidiaries’ Articles of Association. As stipulated by the relevant laws and regulations in mainland China, mainland China subsidiaries are required to maintain reserves, including reserves for
statutory surpluses and public welfare funds that are not distributable to shareholders. A mainland China subsidiary’s appropriations to the reserves are approved by its board of directors. At least
10% of annual statutory after-tax profits, as determined in accordance with mainland China accounting standards and regulations, is required to be allocated to the statutory surplus reserves. If the
cumulative total of the statutory surplus reserves reaches 50% of a mainland China subsidiary’s registered capital, any further appropriation is optional.

Statutory  surplus  reserves  may  be  used  to  offset  accumulated  losses  or  to  increase  the  registered  capital  of  a  mainland  China  subsidiary,  subject  to  approval  from  the  relevant  mainland  China
authorities, and are not available for dividend distribution to the subsidiary’s shareholders. The mainland China subsidiaries are prohibited from distributing dividends unless any losses from prior
years have been offset. Except for offsetting prior years’ losses, however, statutory surplus reserves must be maintained at a minimum of 25% of share capital after such usage. ACM Shanghai
estimated a statutory surplus reserve of $30,060 and $16,881 based on an accumulated profit as of December 31, 2023 and 2022, respectively, which is included in the statutory surplus reserve in the
consolidated balance sheets.

Noncontrolling interests

A noncontrolling interest is recognized to reflect the portion of subsidiaries’ equity which is not attributable, directly or indirectly, to ACM Research. Consolidated net income on the consolidated
statements of comprehensive income (loss) includes the net income attributable to noncontrolling interests. The cumulative results of operations attributable to noncontrolling interests are recorded
as “noncontrolling interests” in the Company’s consolidated balance sheets.

Financial Instruments

The  Company  periodically  invests  in  equity  securities,  and  maintains  an  investment  portfolio  of  various  holdings,  types,  and  maturities.  For  equity  investments  that  do  not  have  a  readily
determinable fair value, the Company classified them as long-term investments, and records them using either: 1) the measurement alternative which measures the equity investments at cost minus
impairment, if any, plus or minus changes resulting from qualifying observable price changes; or 2) the equity method whereby the Company recognizes its proportional share of the income or loss
from the equity method investment. The equity method is utilized when the equity investments are common stock or in substance common stock, and the Company does not have the ability to
control the investee but is deemed to have the ability to exercise significant influence over the investee’s operating or financial policies. For equity investments that have a readily determinable fair
value, the Company classified them as short-term investments, and records them at fair market value on a recurring basis based upon quoted market prices. Realized and unrealized gains and losses
resulting from application of the measurement alternative, the impact of the application of the equity method to the Company’s equity investments, and recognition of changes in fair market value,
as applicable, are recognized as non-operating income (expenses), net in the condensed consolidated statements of comprehensive income (loss).

The Company defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.
When determining the fair value measurements for assets and liabilities required or permitted to be recorded at fair value, the Company considers the principal or most advantageous market in
which it would transact, and it considers assumptions that market participants would use when pricing the asset or liability.

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A fair value hierarchy has been established that prioritizes the inputs to valuation techniques used to measure fair value. The level of an asset or liability in the hierarchy is based on the lowest level
of input that is significant to the fair value measurement. Assets and liabilities carried at fair value are classified and disclosed in one of the following three categories:

Level 1: Valuations based on quoted prices in active markets for identical assets or liabilities with sufficient volume and frequency of transactions.

Level 2: Valuations based on observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities, quoted prices in markets that are not active for identical assets or
liabilities, or model-derived valuations techniques for which all significant inputs are observable in the market or can be corroborated by observable market data for substantially the full term of the
assets or liabilities.

Level 3: Valuations based on unobservable inputs to the valuation methodology that are significant to the measurement of fair value of assets or liabilities and based on non-binding, broker-provided
price quotes and may not have been corroborated by observable market data.

The Company’s primary financial instruments include its cash, cash equivalents, short term and long term deposits, restricted cash, short-term and long-term investments, accounts receivable, other
receivables, accounts payable, and short-term and long-term borrowings. The estimated fair value of cash and cash equivalents, restricted cash, short-term time deposits, accounts receivable, other
receivable, accounts payable, and short-term borrowings approximates their carrying value due to the short period of time to their maturities.

All transfers between fair value hierarchy levels are recognized by the Company at the end of each reporting period. In certain cases, the inputs used to measure fair value may fall into different
levels of the fair value hierarchy. In such cases, an investment’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement in its
entirety, requires judgment and considers factors specific to the investment. The inputs or methodology used for valuing financial instruments are not necessarily an indication of the risks associated
with investment in those instruments.

Assets and liabilities measured at fair value on a recurring basis:

Quoted Prices
in Active
Markets for
Identical
Liabilities (Level 1)

Significant
Other
Observable
Inputs (Level 2)

Significant
Unobservable
Inputs (Level 3)

Total

As of December 31, 2023

Assets

Cash and cash equivalents

Short-term investments

As of December 31, 2022

Assets

Cash and cash equivalents

Short-term investments

$

$

$

$

Assets and liabilities measured at fair value on a non-recurring basis:

182,090  $

21,312 

203,402    $

247,951  $

20,209 

268,160  $

104

-  $

- 

-    $

-  $

- 

-  $

-  $

- 

-    $

-  $

- 

-  $

182,090 

21,312 

203,402 

247,951 

20,209 

268,160 

 
 
 
 
 
 
 
 
 
Table of Contents

As of December 31, 2023

Assets

Quoted Prices
in Active
Markets for
Identical
Liabilities (Level 1)

Significant
Other
Observable
Inputs (Level 2)

Significant
Unobservable
Inputs (Level 3)

Total

Investments accounted for using measurement alternative

$

$

—  $

—  $

—  $

—  $

10,378  $

10,378  $

10,378 

10,378 

The Company did not have any assets and liabilities measured at fair value on a non-recurring basis as of December 31, 2022.

The non-recurring fair value measurements to the carrying amount of equity investments accounted for using measurement alternative usually requires management to estimate a price adjustment
for the different rights and obligations between a similar instrument of the same issuer with an observable price change in an orderly transaction and the investment held by the Company. These non-
recurring fair value measurements were measured by using the observable transaction price and other unobservable inputs (level 3) as of the observable transaction dates.

Refer to Note 12 for fair value information related to the Company’s outstanding long-term borrowings as of December 31, 2023 and December 31, 2022.

Operating and Financial Risks

Concentration of Credit Risk

Financial instruments that potentially subject the Company to credit risk consist principally of cash and cash equivalents, time deposits, and accounts receivable. The Company deposits and invests
its cash with financial institutions that management believes are creditworthy.

The Company is potentially subject to concentrations of credit risks in its accounts receivable and revenue. For the years ended December 31, 2023, 2022 and 2021 three customers accounted for
45.5%, three customers accounted for 43.8% of revenue, and two customers accounted for 48.9%, of revenue, respectively.

As of December 31, 2023 and 2022 four customers accounted for 59.1% and two customers accounted for 42.6%, respectively, of the Company’s accounts receivables. The Company believes that
the receivable balances from these largest customers do not represent a significant credit risk based on past collection experience.

Interest Rate Risk

As of December 31, 2023 and 2022, the balance of the Company’s short term bank borrowings (note 9) were scheduled to mature at various dates within the following year and thus exposed the
Company to modest interest rate risk. As of December 31, 2023, the Company’s long-term borrowings (note 12) carry a fixed interest rate, and the Company may be exposed to the fair value interest
rate risk.

Liquidity Risk

The Company’s working capital at December 31, 2023 and 2022 was sufficient to meet its then-current requirements. The Company may, however, require additional cash due to changing business
conditions  or  other  future  developments,  including  any  investments  or  acquisitions  the  Company  decides  to  pursue.  In  the  long  run,  the  Company  intends  to  rely  primarily  on  cash  flows  from
operations and additional borrowings from financial institutions in order to meet its cash needs. If those sources are insufficient to meet cash requirements, the Company may seek to issue additional
debt or equity.

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Country Risk

The Company has significant investments in mainland China. The operating results of the Company may be adversely affected either directly or indirectly by changes in the political and social
conditions in mainland China, by changes in mainland China government policies with respect to laws and regulations, anti-inflationary measures, currency conversion and remittance abroad, rates
and methods of taxation, and export controls enacted by the U.S., Japan, and the Netherlands to restrict the sale of certain technology to mainland China, among other things.

Foreign Currency Risk and Translation

The Company’s consolidated financial statements are presented in U.S. dollars, which is the Company’s reporting currency, while the functional currency of ACM’s subsidiaries in mainland China
and Korea are the Chinese Renminbi (“RMB”), and the Korean Won, respectively. Changes in the relative values of U.S. dollars and RMB affect the Company’s reported levels of revenues and
profitability as the results of its operations are translated from RMB into U.S. dollars for reporting purposes. Since the Company has not engaged in any hedging activities, it cannot predict the
impact of future exchange rate fluctuations on the results of its operations, and it may experience economic losses as a result of foreign currency exchange rate fluctuations.

Transactions of ACM’s subsidiaries involving foreign currencies are recorded in functional currency according to the rate of exchange prevailing on the date when the transaction occurs. The ending
balances of the Company’s foreign currency accounts are converted into functional currency using the rate of exchange prevailing at the end of each reporting period. Net gains and losses resulting
from foreign exchange fluctuations as marked to market at year-end are included in the consolidated statements of comprehensive income (loss).

In accordance with FASB ASC Topic 830, Foreign Currency Matters, the Company translates assets and liabilities into U.S. dollars from RMB or Korean Won using the rate of exchange prevailing
at the applicable balance sheet date and the consolidated statements of comprehensive income (loss) and consolidated statements of cash flows are translated at an average rate during the reporting
period. Adjustments resulting from the translation are recorded in stockholders’ equity as part of accumulated other comprehensive income (loss).

Recently Adopted Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit
Losses  on  Financial  Instruments  (“ASC  326”).  ASC  326  replaced  the  pre-existing  incurred  loss  impairment  methodology  with  a  methodology  that  reflects  expected  credit  losses  and  requires
consideration  of  a  broader  range  of  reasonable  and  supportable  information  to  inform  credit  loss  estimates.  ASC  326  requires  use  of  a  forward-looking  expected  credit  loss  model  for  accounts
receivables, loans and other financial instruments.

In November 2019, the FASB issued ASU 2019-10, Financial Instruments – Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Dates. ASU 2019-10
defers the effective date of ASU 2016-13 for public filers that are considered small reporting companies (“SRC”) as defined by the SEC to fiscal years beginning after December 15, 2022, including
interim periods within those fiscal years. Since the Company was eligible to be a SRC based on its SRC determination as of November 15, 2019 (which was the issuance date of ASU 2019-10) in
accordance with SEC regulations, the Company adopted amendments in ASC 326 for the year beginning January 1, 2023. Adoption of the standard requires using a modified retrospective approach
through a cumulative-effect adjustment to retained earnings as of the effective date to align existing credit loss methodology with the new standard. The cumulative-effect adjustment, net of tax
impact, to retained earnings as of January 1, 2023 was $(1,769).

In June 2022, the FASB issued ASU 2022-03—Fair Value Measurement (Topic 820): Fair Value Measurement of Equity Securities Subject to Contractual Sale Restrictions (“ASU 2022-03”) which
clarifies how the fair values of equity securities subject to contractual sale restrictions is determined (Topic 820). The amendment clarifies that a contractual sale restriction should not be considered
in measuring fair value. It also requires certain qualitative and quantitative disclosures related to equity securities subject to contractual sale restrictions. The new guidance is required to be applied
prospectively with any adjustments from the adoption of the amendments recognized in earnings and disclosed on the date of adoption. This guidance is effective for the Company for fiscal year
beginning  after  December  15,  2023,  and  interim  periods  within  those  fiscal  years.  Early  adoption  is  permitted.  The  Company  early  adopted  ASU  2022-03  in  the  third  quarter  of  2023,  and  the
adoption did not have a material impact on the Company’s financial position, results of operations and cash flows.

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Recently issued accounting pronouncements not yet adopted

In November 2023, the FASB issued ASU No. 2023-07, Improvements to Reportable Segment Disclosures. This ASU updates reportable segment disclosure requirements by requiring disclosures of
significant reportable segment expenses that are regularly provided to the Chief Operating Decision Maker (“CODM”) and included within each reported measure of a segment's profit or loss. This
ASU also requires disclosure of the title and position of the individual identified as the CODM and an explanation of how the CODM uses the reported measures of a segment’s profit or loss in
assessing  segment  performance  and  deciding  how  to  allocate  resources.  The  ASU  is  effective  for  annual  periods  beginning  after  December  15,  2023,  and  interim  periods  within  fiscal  years
beginning after December 15, 2024. Adoption of the ASU should be applied retrospectively to all prior periods presented in the financial statements. Early adoption is also permitted. The Company
is currently evaluating the provisions of this ASU and expect to adopt it for the year ending December 31, 2024.

In December 2023, the FASB issued ASU No. 2023-09, Improvements to Income Tax Disclosures (Topic 740). The ASU requires disaggregated information about a reporting entity’s effective tax
rate  reconciliation  as  well  as  additional  information  on  income  taxes  paid.  The  ASU  is  effective  on  a  prospective  basis  for  annual  periods  beginning  after  December  15,  2024.  Retrospective
application  is  permitted.  Early  adoption  is  also  permitted  for  annual  financial  statements  that  have  not  yet  been  issued  or  made  available  for  issuance.  The  Company  is  currently  evaluating  the
provisions of this ASU.

NOTE 3 – REVENUE FROM CONTRACTS WITH CUSTOMERS

The Company assesses revenues based upon the nature or type of goods or services it provides and the geographic location of the customer facility. The following tables present disaggregated
revenue information:

Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment

ECP (front-end and packaging), Furnace and Other Technologies

Advanced Packaging (excluding ECP), Services & Spares

Total Revenue By Product Category

Mainland China

Other regions

Below are the accounts receivables and contract liabilities balances as of:

Accounts receivable

Advances from customers

Deferred revenue

Year Ended December 31,

2023

2022

2021

403,851  $

103,356 

50,516 

557,723  $

272,939  $

77,482 

38,411 

388,832  $

Year Ended December 31,

2023

2022

2021

540,969  $

16,754 

557,723  $

377,752  $

11,080 

388,832  $

189,208 

33,210 

37,333 

259,751 

258,615 

1,136 

259,751 

$

$

$

$

December 31,
2023

December 31,
2022

$

283,186  $

181,368 

3,687 

182,936 

153,773 

4,174 

During the year ended December 31, 2023, advances from customers increased by $27,595 primarily due to a net increase of payments made by customers for first tools under evaluation.

107

 
 
 
 
Table of Contents

Below are revenues recognized from amounts included in contract liabilities at the beginning of the year:

Revenue recognized from amounts included in contract liabilities at the beginning of the year

$

97,370  $

30,385  $

13,425 

Year Ended December 31,

2023

2022

2021

NOTE 4 – ACCOUNTS RECEIVABLE

At December 31, 2023 and 2022, accounts receivable consisted of the following:

Accounts receivable

Less: Allowance for credit losses

Total

December 31,

2023

2022

$

$

288,016  $

(4,830)

283,186  $

182,936 

- 

182,936 

The $100,250 increase in accounts receivable for the year ended December 31, 2023 corresponds to a $168,891 increase in revenue for the same period.

Cumulative effect of change in accounting principle under ASC 326, before tax, as of January 1, 2023

Provision for credit loss

Allowance for credit losses, before tax, as of December 31, 2023

December 31,

2023

2022

$

$

(2,099) $

(2,731)

(4,830) $

— 

— 

— 

The  Company  assesses  collectability  by  reviewing  accounts  receivable  on  a  general  basis  where  similar  characteristics  exist  and  on  an  individual  basis  when  the  Company  identifies  specific
customers with known disputes or collectability issues. In determining the amount of the allowance for credit losses, the Company considers historical collectability based on past due status, the age
of the accounts receivable balances, credit quality of the Company’s customers based on ongoing credit evaluations, current economic conditions, reasonable and supportable forecasts of future
economic conditions, and other factors that may affect the Company’s ability to collect from customers. As a result of the Company’s adoption of ASC 326 as of January 1, 2023 (Note 2), the
Company recorded an allowance for credit losses as of December 31, 2023, as compared to no allowance for credit losses as of December 31, 2022.

NOTE 5 – INVENTORIES

At December 31, 2023 and 2022, inventory consisted of the following:

Raw materials

Work-in-process

Finished goods

Total inventory

December 31,

2023

2022

$

$

235,062  $

81,438 

228,895 

545,395  $

167,135 

79,126 

146,911 

393,172 

At  December  31,  2023  and  December  31,  2022,  the  value  of  finished  goods  inventory,  which  is  comprised  of  first-tools  at  customer  physical  locations,  for  which  customers  were  contractually
obligated to take ownership upon acceptance, totaled $123,390 and $123,169, respectively.

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Table of Contents

The $70,239 increase in raw materials and work-in-process inventory at December 31, 2023 compared to December 31, 2022 was due to additional purchase of supplies to support a higher level of
expected total shipments for the next several quarters, and to reduce the risk of supply chain delays to meet anticipated customer demand for the Company’s products. The $81,984 increase in
finished  goods  inventory  at  December  31,  2023  compared  to  December  31,  2022  reflects  a  higher  value  of  completed  tools  at  the  Company's  facilities,  and  a  higher  value  of  first-tools  under
evaluation by existing or prospective customers, due to shipments made, net of customer acceptances during the period.

The  Company’s  products  each  require  a  certain  degree  of  customization,  and  the  substantial  majority  of  the  work-in-process  inventory  and  finished  goods  inventory  is  built  to  meet  a  specific
customer order for repeat shipment or first tool delivery. At the end of each period, the Company assesses the status of each item in work-in-process and finished goods inventory. The Company
recognizes a loss or impairment if in management’s judgement the inventory cannot be sold or used for production, if it has been damaged or should be considered as obsolete, or if the net realizable
value is lower than the cost.

At the end of each period, the Company also assesses the status of its raw materials. The Company recognizes a loss or impairment for any raw materials aged more than three years. The three-year
aging is based on the Company’s assessment of technology change, its requirement to maintain stock for warranty coverage, and other factors.

During the years ended December 31, 2023, 2022, and 2021, provision for inventory of $575, $2,248, and $75 were recognized in cost of revenue, respectively. Write-downs were due to an internal
assessment that certain inventory could not be sold or used for production due to damage or obsolescence.

NOTE 6 – PROPERTY, PLANT AND EQUIPMENT, NET

At December 31, 2023 and 2022, property, plant and equipment consisted of the following:

Buildings and plants

Manufacturing equipment

Office equipment

Transportation equipment

Leasehold improvement

Total cost

Less: Total accumulated depreciation and amortization

Construction in progress

Total property, plant and equipment, net

December 31,

2023

2022

83,109  $

16,556 

4,953 

404 

7,889 

112,911 

(17,503)

106,440 

201,848  $

35,864 

9,298 

3,691 

407 

7,173 

56,433 

(10,047)

36,489 

82,875 

$

$

Depreciation expense was $6,912, $4,839, and $2,099 for the years ended December 31, 2023, 2022, and 2021, respectively. Buildings and plants represent Lingang housing property owned by
ACM Shengwei at a value of RMB 249,746 ($35,264) as of December 31, 2023, and facilities for the new headquarters of ACM Shanghai ("Zhangjiang New Building") at a value of RMB 338,848
($47,845) as of December 31, 2023. The Lingang housing property is pledged as security for loans from China Merchants Bank (Note 12).

Construction in progress primarily reflects costs incurred related to the construction of ACM Shanghai’s Lingang development and production center, and is scheduled to begin production in 2024.

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Table of Contents

NOTE 7 – LAND USE RIGHT, NET

A summary of land use right is as follows:

Land use right purchase amount

Less: accumulated amortization

Land use right, net

The amortization for the years ended December 31, 2023, 2022 and 2021 was $181, $189 and $199, respectively.

The annual amortization of land use right for each of the five succeeding years is as follows:

Year ending December 31,

2024

2025

2026

2027

2028

2029 and thereafter

Total

NOTE 8 – OTHER LONG-TERM ASSETS

At December 31, 2023 and 2022, other long-term assets consisted of the following:

Prepayment for property, plant and equipment

Lease deposit

Security deposit for land use right

Prepayment for property - Zhangjiang New Building

Others

Total other long-term assets

December 31,

2023

2022

8,996  $

(629)

8,367  $

$

$

December 31,

2023

2022

3,380  $

834 

696 

— 

1,140 

6,050  $

9,149 

(457)

8,692 

180 

180 

180 

180 

180 

7,467 

8,367 

704 

393 

708 

47,251 

1,209 

50,265 

$

$

$

$

Prepayment for property - Zhangjiang New Building is for the new corporate headquarters of ACM Shanghai. Pursuant  to  contractual  agreements,  ownership  of Zhangjiang  New  Building  was
transferred  to  ACM  Shanghai  in  February  2023  at value  of  RMB  338,848  ($47,201).  Upon  the  transfer  of  ownership,  Prepayment  for  property  -  Zhangjiang  New  Building  was  reclassified  to
property, plant and equipment (Note 6).

NOTE 9 – SHORT-TERM BORROWINGS

At December 31, 2023 and December 31, 2022, short-term borrowings consisted of the following:

Line of credit up to RMB 150,000 from China Everbright Bank,

1)due on August 17, 2023 with an annual interest rate of 3.40%.

2)due on September 1, 2023 with an annual interest rate of 3.60%.

110

December 31,

2023

2022

— 

— 

8,616 

8,616 

 
 
Table of Contents

   3)due on December 16, 2023 with an annual interest rate of 3.00%

4)due on August 29,2024 with an annual interest rate of 3.00%.

Line of credit up to RMB 100,000 from Bank of Communications,

1)due on August 11, 2023 with an annual interest rate of 3.60%.

2)due on September 5, 2023 with an annual interest rate of 3.50%.

Line of credit up to RMB 40,000 from Bank of China,

1)due on August 26, 2023 with an annual interest rate of 3.15%.

Line of credit up to RMB 40,000 from Bank of China,

 1)due on September 7, 2024 with an annual interest rate of 2.87%

Line of credit up to RMB 100,000 from China Merchants Bank,

1)due on July 21, 2023 with an annual interest rate of 3.50%

2)due on July 27, 2023 with an annual interest rate of 3.50%

3)due on August 1, 2023 with an annual interest rate of 3.50%

4)due on August 3, 2023 with an annual interest rate of 3.50%

5)due on August 7, 2023 with an annual interest rate of 3.50%

6)due on August 14, 2023 with an annual interest rate of 3.50%

7)due on August 15, 2023 with an annual interest rate of 3.50%

8)due on August 21, 2023 with an annual interest rate of 3.50%

9)due on August 28, 2023 with an annual interest rate of 3.50%

10)due on September 13, 2023 with an annual interest rate of 3.50%

11)due on September 20, 2023 with an annual interest rate of 3.50%

12)due on October 7, 2023 with an annual interest rate of 3.50%

Line of credit up to RMB 200,000 from China Merchants Bank,

1)due on August 7,2024 with an annual interest rate of 3.00%.

2)due on August 8,2024 with an annual interest rate of 3.00%.

3)due on August 9,2024 with an annual interest rate of 3.00%.

4)due on August 14,2024 with an annual interest rate of 3.00%.

5)due on August 17,2024 with an annual interest rate of 3.00%.

6)due on August 20,2024 with an annual interest rate of 3.00%.

7)due on August 21,2024 with an annual interest rate of 3.00%.

8)due on August 22,2024 with an annual interest rate of 3.00%.

9)due on August 24,2024 with an annual interest rate of 3.00%.

10)due on August 27,2024 with an annual interest rate of 3.00%.

11)due on August 29,2024 with an annual interest rate of 3.00%.

12)due on August 30,2024 with an annual interest rate of 3.00%.

13)due on September 3,2024 with an annual interest rate of 3.00%.

14)due on September 5,2024 with an annual interest rate of 3.00%.

15)due on September 6,2024 with an annual interest rate of 3.00%.

16)due on September 10,2024 with an annual interest rate of 3.00%.

17)due on September 12,2024 with an annual interest rate of 3.00%.

Line of credit up to KRW 500,000 from Industrial Bank of Korea,

1)due on July 12,2024 with an annual interest rate of 6.03%.

Line of credit up to KRW 2,000,000 from Industrial Bank of Korea,

111

-   

2,463 

— 

— 

— 

5,648 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

— 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,271 

1,270 

1,270 

1,270 

1,270 

77 

4,308 

- 

8,616 

5,744 

5,744 

— 

1,292 

1,292 

1,292 

1,292 

1,293 

1,293 

1,293 

1,005 

1,292 

1,292 

1,293 

431 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

 
 
 
 
 
 
Table of Contents

1)due on December 15,2024 with an annual interest rate of 4.27%.

Total

$

1,544 

31,335  $

- 

56,004 

For the years ended December 31, 2023, 2022 and 2021, interest expense related to short-term borrowings amounted to $1,581, $810, and $700, respectively.

NOTE 10 – OTHER PAYABLES AND ACCRUED EXPENSES

At December 31, 2023 and 2022, other payables and accrued expenses consisted of the following:

Accrued commissions

Accrued warranty

Accrued payroll

Accrued professional fees

Accrued machine testing fees

Accrued machine sales fees

Accrued Lingang construction fees

Others

Total

NOTE 11 – LEASES

December 31,

2023

2022

$

$

15,572  $

9,834 

14,840 

696 

1,762 

6,010 

33,729 

20,508 

102,951  $

14,890 

8,780 

12,201 

724 

1,215 

5,874 

738 

7,779 

52,201 

The Company leases space under non-cancelable operating leases for several office and manufacturing locations. These leases do not have significant rent escalation holidays, concessions, leasehold
improvement incentives, or other build-out clauses. Further, the leases do not contain contingent rent provisions.

Most leases include one or more options to renew. The Company regularly evaluates the renewal options, and when they are reasonably certain of exercise, the Company includes the renewal period
in its lease term.

The components of lease expense were as follows:

Operating lease cost

Short-term lease cost

Lease cost

Year Ended December 31,

2023

2022

2021

$

$

3,580  $

923 

4,503  $

2,816  $

786 

3,602  $

Supplemental cash flow information related to operating leases was as follows for the years ended December 31, 2023, 2022, and 2021:

Operating cash outflow from operating leases

Operating lease right-of-use assets obtained in exchange for new operating lease liabilities

Year Ended December 31,

2023

2022

2021

3,580  $

2,816  $

8,195  $

1,054  $

$

$

2,451 

394 

2,845 

2,451 

1,818 

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Maturities of lease liabilities for all operating leases were as follows as of December 31, 2023:

2024

2025

2026

2027

2028 and thereafter

Total lease payments

Less: Interest

Present value of lease liabilities

The weighted average remaining lease terms and discount rates for all operating leases were as follows as of December 31, 2023 and 2022:

Remaining lease term and discount rate:

Weighted average remaining lease term (years)

Weighted average discount rate

NOTE 12 – LONG-TERM BORROWINGS

At December 31, 2023 and 2022, long-term borrowings consisted of the following:

Loan from China Merchants Bank

Loans from Bank of China

Loan from Bank of Shanghai

Loans from China CITIC Bank

Less: Current portion

December 31,

3,016 

1,767 

1,207 

1,150 

595 

7,735 

(709)

7,026 

$

$

$

December 31,

2023

2022

3.44

3.91 %

2.00

4.25 %

December 31,

2023

2022

$

$

13,362  $

5,013 

14,120 

28,240 

(6,783)

53,952  $

15,265 

5,744 

— 

— 

(2,322)

18,687 

The loan from China Merchants Bank is for the purpose of purchasing property in Lingang, Shanghai. The loan is repayable in 120 installments with the last installment due in November 2030, with
an annual interest rate of 4.65%. The loan is pledged by the property of ACM Shengwei and guaranteed by ACM Shanghai.

Two loans from Bank of China are for the purpose of funding ACM Shanghai project expenditures. The loans bear interest at an annual rate of 2.6% and are repayable in 6 installments, with the last
installments due in June 2024 and September 2024.

The loan from Bank of Shanghai is for the purpose of funding ACM Shanghai project expenditures. The loan bears interest at an annual rate of 2.85%, and will be fully repaid in April 2025.

The first loan from China CITIC Bank is for the purpose of funding ACM Shanghai project expenditures. The loan bears interest at an annual rate of 3.40% and are repayable in 4 installments, with
the last installment due in August 2025.

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The second loan from China CITIC bank is for the purpose of funding ACM's general corporate expenses and working capital. The loan bears interest at an annual rate of 4.50% payable quarterly,
and the principal amount is repayable in 4 installments, with the last installment due in December 2025.

As  of  December  31,  2023  and  December  31,  2022,  the  total  carrying  amount  of  long-term  loans  was  $60,735  and  $21,009,  compared  with  an  estimated  fair  value  of  $56,462  and  $18,538,
respectively.  The  fair  value  of  the  long-term  loans  is  estimated  by  discounting  cash  flows  using  interest  rates  currently  available  for  debts  with  similar  terms  and  maturities  (Level  2  fair  value
measurement). Refer to Note 2 for an explanation of the fair value hierarchy structure.

Scheduled principal payments for the outstanding long-term loans, including the current portion, as of December 31, 2023 are as follows:

Year ending December 31,

2024

2025

2026

2027

2028

Thereafter

$

$

6,783 

44,087 

1,855 

1,929 

2,007 

4,074 

60,735 

For the years ended December 31, 2023 and 2022, respectively, $1,100 and $845 of interest expense related to long-term borrowings was incurred. For the year ended December 31, 2021, $1,040 of
interest related to long-term borrowings was incurred, of which $65 was charged to interest expense and $975 was capitalized as other long-term assets.

NOTE 13 – OTHER LONG-TERM LIABILITIES

Other  long-term  liabilities  represent  government  subsidies  received  from  mainland  China  governmental  authorities  for  development  and  commercialization  of  certain  technology  but  not  yet
recognized (note 2). As of December 31, 2023 and 2022, other long-term liabilities consisted of the following unearned government subsidies:

Subsidies to Stress Free Polishing project, commenced in 2008 and 2017

Subsidies to other cleaning tools, commenced in 2020

Subsidies to SW Lingang R&D development in 2021

Subsidies to CO2 Technology

Other

Total

NOTE 14 – LONG-TERM INVESTMENTS

December 31,

2023

2022

$

$

475  $

632 

3,467 

275 

1,024 

5,873  $

611 

785 

4,266 

965 

694 

7,321 

On September 6, 2017, ACM and Ninebell Co., Ltd. (“Ninebell”), a Korean company that is one of the Company’s principal material suppliers, entered into an ordinary share purchase agreement,
effective as of September 11, 2017, pursuant to which Ninebell issued to ACM ordinary shares representing 20% of Ninebell’s post-closing equity for a purchase price of $1,200, and a common
stock purchase agreement, effective as of September 11, 2017, pursuant to which ACM issued 400,002 shares of Class A common stock to Ninebell for a purchase price of $1,000 at $2.50 per share.
The investment in Ninebell is accounted for under the equity method.

On June 27, 2019, ACM Shanghai and Shengyi Semiconductor Technology Co., Ltd. (“Shengyi”), a company based in Wuxi, China that is one of the Company’s component suppliers, entered into
an agreement pursuant to which Shengyi issued to ACM Shanghai shares representing 15% of Shengyi’s post-closing equity for a purchase price of $109. The investment in Shengyi is accounted for
under the equity method. In September 2023, the Company invested additional

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RMB 6,100 ($900) to Shengyi. As the additional investment is not in substance common stock, the Company measures the additional investment in Shengyi at measurement alternative.

On September 5, 2019, ACM Shanghai entered into a Partnership Agreement with six other investors, as limited partners, and Beijing Shixi Qingliu Investment Co., Ltd., as general partner and
manager, with respect to the formation of Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP), a Chinese limited partnership based in Hefei, China. Pursuant to
such Partnership Agreement, on September 30, 2019, ACM Shanghai invested RMB 30,000 ($4,200), which represented 10% of the partnership’s total subscribed capital. The investment in Hefei
Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) is accounted for under the equity method in accordance with ASC 323-30-S99-1.

On October 29, 2021, ACM Shanghai and Waferworks (Shanghai) Co., Ltd, or Waferworks, a company based in Shanghai, China, and one of the Company’s customers, entered into an agreement
pursuant to which Waferworks issued to ACM Shanghai shares representing 0.25% of Waferworks’ post-closing equity for a purchase price of $1,568. As the investment is not in substance common
stock and there is no readily determinable fair value, the Company measures the investment in Waferworks at measurement alternative.

On August 17, 2022, ACM Singapore and Wooil Flucon Co., Ltd. (“Wooil”), a company based in Korea and a potential component supplier to the Company, entered into an agreement pursuant to
which Wooil, on September 1, 2022, issued to ACM Singapore shares representing 20% of Wooil’s post-closing equity for a purchase price of $1,000. The investment in Wooil is accounted for
under the equity method.

In September 2023, ACM Shanghai entered into a partnership agreement with Company A to invest RMB 30,000 ($4,200), which represented 4.37% of the partnership's total subscribed capital.
Since there is no readily determinable fair value, the Company measures the investments at measurement alternative.

In November 2023, ACM Shanghai entered into a partnership agreement with Company B to invest RMB 6,600 ($930), which represented 1.38% of the partnership's total subscribed capital. Since
there is no readily determinable fair value, the Company measures the investments at measurement alternative.

Equity investee:

Ninebell

Wooil

Shengyi

Hefei Shixi

Subtotal

Investments accounted for using measurement alternative:

Waferworks

Shengyi

Company A

Company B

Other

Total

December 31,

2023

2022

$

5,632  $

1,003 

1,693 

9,174 

17,502 

1,412 

857 

4,236 

932 

2,941 

5,199 

1,011 

1,168 

8,645 

16,023 

1,436 

— 

— 

— 

— 

$

27,880  $

17,459 

The Company recognized $1,465, nil, and nil (upward adjustments) resulting from observable price changes in orderly transactions for an identical or similar investment of the same issuer on the
consolidated statements of comprehensive income (loss) for the years ended December 31, 2023, 2022, and 2021, respectively. No unrealized losses (downward adjustments) were recorded by the
Company during the years ended December 31, 2023, 2022, and 2021.

NOTE 15 – SHORT-TERM INVESTMENTS

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Pursuant  to  a  Partnership  Agreement  dated  June  9,  2020  (the  “Partnership  Agreement”)  and  a  Supplementary  Agreement  thereto  dated  June  15,  2020  (the  “Supplementary  Agreement”),  ACM
Shanghai acquired shares of SMIC in July 2020. Shares of SMIC are listed on the STAR Market.

Pursuant to an Agreement entered into on September 19, 2022 (the ‘‘Agreement’’), ACM Shanghai became a limited partner of the Nuode Asset Fund Pujiang No. 783 Single Asset Management
Plan (‘‘Nuode Asset Fund’’), a Chinese limited partnership formed by Nuode Asset Management Co., Ltd, a financial services firm based in Shanghai, China. Nuode Asset Fund was formed to
establish a special fund with the purpose to participate in certain technology related investments in mainland China. Subsequent to the future purchase, any investment will be held by Nuode Asset
Fund and restricted for a minimum period of nine months. The limited partners of the Nuode Asset Fund contributed a $22,160 to the fund, of which ACM Shanghai contributed $4,196, or 18.75%
of the contribution on September 27, 2022.

In December 2022, the Nuode Asset Fund purchased shares in the secondary stock offering of a publicly traded mainland China-stock listing. The number of shares owned by Nuode Asset Fund
was apportioned to all of the limited partners in proportion to their respective capital contributions which is 18.75% in the case of ACM Shanghai.

Pursuant to a Share Purchase Agreement dated June 2023, ACM Shanghai acquired shares of Huahong Semiconductor Limited (“Huahong”) in July 2023 with amount of $13,930. The shares held
by ACM Shanghai are restricted for sale for a minimum period of twelve months. Huahong completed it STAR IPO in August 2023.

Pursuant to a Share Purchase Agreement dated August 2023, ACM Shanghai acquired shares of Zhongjuxin Limited Company (“Zhongjuxin”) in September 2023 with amount of RMB $4,179. The
shares held by ACM Shanghai are restricted for sale for a minimum period of twelve months. Zhongjuxin completed it STAR IPO in September 2023.

The components of short-term investments were as follows:

Short-term investments listed in Shanghai Stock Exchange

Cost

Market value

NOTE 16 – RELATED PARTY BALANCES AND TRANSACTIONS

Ninebell

December 31,

2023

2022

$

$

20,155  $

21,312  $

14,779 

20,209 

Ninebell is an equity investee of ACM (Note 14) and is the Company’s principal supplier of robotic delivery system subassemblies used in our single-wafer cleaning equipment. The Company
purchases equipment from Ninebell for production in the ordinary course of business. The Company pays for a portion of the equipment in advance and is obligated for the remaining amounts upon
receipt of the product.

Shengyi

Shengyi is an equity investee of ACM Shanghai (Note 14) and is one of the Company’s component suppliers in mainland China. The Company purchases components from Shengyi for production
in the ordinary course of business. The Company incurs a service fee related to installation and hook-up fees which is recorded within cost of revenue on the Company’s consolidated statements of
comprehensive income (loss). The Company pays for a portion of the raw materials in advance and is obligated for the remaining amounts upon receipt of the product.

All related party outstanding balances are short-term in nature and are expected to be settled in cash.

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The following tables represent related party transactions with the equity investees as of December 31, 2023 and 2022:

Advances to related party

Ninebell

Accounts payable

Ninebell

Shengyi

Total

Purchase of materials

Ninebell

Shengyi

Total

Service fee charged by

Shengyi

Total

NOTE 17 – COMMON STOCK

$

$

$

$

December 31,

2023

2022

2,432  $

3,322 

December 31,

2023

2022

7,624  $

3,783 

11,407  $

$

$

$

10,526 

3,942 

14,468 

33,659 

2,434 

36,093 

Year Ended December 31

2023

2022

2021

42,737  $

5,006 

47,743  $

40,985  $

5,350 

46,335  $

Year Ended December 31

2023

2022

2021

820  $

820  $

543  $

543  $

561 

561 

At December 31, 2023 and 2022, ACM was authorized to issue 150,000,000 shares of Class A common stock and 5,307,816 shares of Class B common stock, each with a par value of $0.0001.
Each share of Class A common stock is entitled to one vote, and each share of Class B common stock is entitled to twenty votes and is convertible at any time into one share of Class A common
stock. Shares of Class A common stock and Class B common stock are treated equally, identically and ratably with respect to any dividends declared by the Board of Directors unless the Board of
Directors declares different dividends to the Class A common stock and Class B common stock by getting approval from a majority of common stockholders.

During the year ended December 31, 2023, ACM issued 1,380,886 shares of Class A common stock upon option exercises by employees and non-employees. During the year ended December 31,
2022,  ACM  issued  980,354  shares  of  Class  A  common  stock  upon  options  exercises  by  certain  employees  and  non-employees  and  an  additional  66,003  shares  of  Class  A  common  stock  upon
conversion of an equal number of shares of Class B common stock.

At December 31, 2023 and 2022, the number of shares of Class A common stock issued and outstanding was 56,036,172 and 54,655,286, respectively. At December 31, 2023 and 2022, the number
of shares of Class B common stock issued and outstanding was 5,021,811 and 5,021,811, respectively.

NOTE 18 – STOCK-BASED COMPENSATION

ACM’s stock-based compensation consists of employee and non-employee awards issued under its 1998 Stock Option Plan and its 2016 Omnibus Incentive Plan. The vesting condition may consist
of service period condition or certain performance conditions, as determined by the Board of Directors. The fair value of the stock options granted with a service period based condition and/or
performance condition is estimated at the date of grant using the Black-Scholes option pricing model. The fair value of the stock options granted with a market based condition is estimated at the
date of grant using the Monte Carlo simulation model.

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Employee Awards

The following table summarizes the ACM’s employee share option activities during the years ended December 31, 2021, 2022 and 2023:

Number of
Option Shares

Weighted
Average Grant
Date Fair Value

Weighted
Average
Exercise Price

Outstanding at December 31, 2020

9,574,233 $

1.71  $

Granted

Exercised

Forfeited/cancelled

421,200

(1,431,174)

(162,012)

16.05 

0.82 

8.32 

Outstanding at December 31, 2021

8,402,247 $

2.45  $

Granted

Exercised

Forfeited/cancelled

1,653,300

(416,546)

(427,360)

10.31 

1.20 

11.41 

Outstanding at December 31, 2022

9,211,641 $

3.58  $

Granted

Exercised

Forfeited/cancelled

Outstanding at December 31, 2023

Vested and exercisable at December 31, 2023

2,230,500

(1,080,952)

(362,552)

9,998,637 $

6,044,572

10.38 

0.90 

11.24 

5.15  $

4.24 

35.38 

2.10 

19.03 

5.88 

22.41 

2.97 

25.24 

8.24 

13.91 

2.28 

22.92 

9.47 

Weighted Average
Remaining
Contractual Term

7.13 years

6.53 years

6.36 years

6.17 years

As  of  December  31,  2023,  $27,152  of  total  unrecognized  employee  stock-based  compensation  expense,  net  of  estimated  forfeitures,  related  to  stock-based  awards  for  ACM  was  expected  to  be
recognized over a weighted-average period of 3.96 years. Total recognized compensation cost may be adjusted for future changes in estimated forfeitures.

The aggregate intrinsic value of options exercised in the years ended December 31, 2023, 2022, and 2021 was $15,457, $6,429, and $43,356, respectively. The aggregate intrinsic value of options
outstanding and exercisable as of December 31, 2023 were $108,771 and $82,848, respectively.

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation model with the following assumptions:

Fair value of common stock(1)

Expected term in years(2)

Volatility(3)

Risk-free interest rate(4)

Expected dividend(5)

Year ended December 31,

2023

2022

2021

$11.85-$17.23

5.50-6.25

84.95-86.45%

4.16%-4.69%

0 %

$16.83- 25.45

5.50-6.25

49.43-50.87%

1.70%-3.04%

0 %

$12.79- 17.02

6.25

48.53-49.47%

1.00%-1.44%

0 %

(1)
(2)
(3)
(4)

Fair value of Class A common stock value was the closing market price of the Class A common stock on the grant date.
Expected term of share options is based on the average of the vesting period and the contractual term for each grant.
Volatility is calculated based on the historical volatility of ACM in the period equal to the expected term of each grant.
Risk-free interest rate is based on the yields of U.S. Treasury securities with maturities similar to the expected term of the share options in effect at the time of grant.

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(5)

Expected dividend is assumed to be 0% as ACM has no history or expectation of paying a dividend on its common stock.

Non-employee Award

The following table summarizes the ACM's non-employee share option activities during the years ended December 31, 2021, 2022 and 2023:

Outstanding at December 31, 2020

Exercised

Forfeited/cancelled

Outstanding at December 31, 2021

Exercised

Forfeited/cancelled

Outstanding at December 31, 2022

Exercised

Forfeited/cancelled

Outstanding at December 31, 2023

Vested and exercisable at December 31, 2023

Number of
Option Shares (1)

Weighted
Average Grant
Date Fair Value (1)

Weighted
Average
Exercise Price (1)

Weighted Average
Remaining
Contractual Term

2,508,114 $

(439,629)

(1,467)

2,067,018 $

(563,808)

(19,552)

1,483,658 $

(299,934)

(12,929)

1,170,795 $

1,167,045

0.34  $

0.37 

0.11 

0.33  $

0.21 

0.21 

0.38  $

0.24 

0.22 

0.42  $

1.02 

1.28 

0.28 

0.97 

0.51 

0.48 

1.15 

0.55 

0.50 

1.31 

4.92 years

3.98 years

3.68 years

2.66 years

As  of  December  31,  2023,  $9  of  total  unrecognized  non-employee  stock-based  compensation  expense,  net  of  estimated  forfeitures,  related  to  stock-based  awards  were  both  expected  to  be
recognized over a weighted-average period of 0.20 year. Total recognized compensation cost may be adjusted for future changes in estimated forfeitures. The aggregate intrinsic value of options
exercised  in  the  years  ended  December  31,  2023,  2022  and  2021was  $3,796,  $9,110  and  $11,993,  respectively.  The  aggregate  intrinsic  value  of  options  outstanding  and  exercisable  as  of
December 31, 2023 were $21,342 and $21,301, respectively.

ACM Shanghai 2019 Option Grants

In January 2020, ACM Shanghai adopted a 2019 Stock Option Incentive Plan (the “2019 Subsidiary Stock Option Plan”) that provides for, among other incentives, the granting to officers, directors,
employees  of  options  to  purchase  shares  of  ACM  Shanghai’s  common  stock.  The  vesting  conditions  consist  of  service  periods  conditions  and  performance  conditions  related  to  certain  earning
targets determined by the Board of Directors of ACM Shanghai.

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The following table summarizes the ACM Shanghai employee stock option activities during the years ended December 31, 2023, 2022 and 2021 :

Outstanding at December 31, 2020

Forfeited/cancelled

Outstanding at December 31, 2021

Outstanding at December 31, 2022

 Exercised

 Forfeited/cancelled

Outstanding at December 31, 2023

Vested and exercisable at December 31, 2023

Number of
Option Shares in
ACM Shanghai

Weighted
Average Grant
Date Fair Value

Weighted
Average
Exercise Price

Weighted Average
Remaining
Contractual Term

5,423,654

(46,154)

5,377,500 $

5,377,500 $

(2,150,309)

(92,308)

3,134,883 $

492,308

0.24 

0.24  $

0.23  $

0.20 

0.22 

0.24  $

2.04 

2.04 

1.93 

1.85 

1.85 

1.85 

2.50 years

2.50 years

1.76 years

0.85 years

The  aggregate  intrinsic  value  of  options  exercised  in  the  years  ended  December  31,  2023  and  2022  and  2021  was  $31,144,  nil  and  nil,  respectively.  The  aggregate  intrinsic  value  of  options
outstanding and exercisable as of December 31, 2023 were $40,663 and $6,386, respectively.

ACM Shanghai 2023 Option Grants

In June 2023, ACM Shanghai adopted a 2023 Stock Option Incentive Plan ( the "2023 Subsidiary Stock Option Plan”) that provides for, among other incentives, the granting to officers, directors,
employees of options to purchase shares of ACM Shanghai’s common stock. The vesting conditions consist of service periods conditions and performance conditions related to certain sales and
research and development progress targets determined by the Board of Directors of ACM Shanghai.

The following table summarizes the ACM Shanghai 2023 Subsidiary Stock Option Plan’s stock option activities during the year ended December 31, 2023:

Outstanding at December 31, 2022

Granted

Forfeited/cancelled

Outstanding at December 31, 2023

Vested and exercisable at December 31, 2023

Number of Option
Shares in ACM
Shanghai

Weighted
Average Grant
Date Fair Value

Weighted
Average
Exercise Price

—  $

10,648,500 $

(73,000) $

10,575,500 $

— 

—  $

9.49  $

9.49  $

9.49  $

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation with following assumptions:

Fair value of share of common stock (1)

Expected term in years (2)

Volatility (3)

Risk-free interest rate (4)

120

Weighted
Average
Remaining
Contractual Term

0.00 years

3.09 years

3.09 years

— 

7.06 

7.06 

7.06 

Year Ended December 31,
2023

$14.87

1.5-4.5

60.00%-60.60%

1.50%-2.75%

 
 
 
 
 
 
 
 
 
 
 
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(1) Equal to closing value on the grant date.
(2) Expected term of share options is based on the average of the vesting period and the contractual term for each grant.
(3) Volatility is calculated based on the historical volatility of ACM in the period equal to the expected term of each grant.
(4) Risk-free interest rate is based on the yields of RMB deposit in mainland China with maturities similar to the expected term of the share options in effect at the time of grant.

The aggregate intrinsic value of options outstanding as of December 31, 2023 was $81,981.

As of December 31, 2023, $79,882 of total unrecognized employee stock-based compensation expense, net of estimated forfeitures, related to ACM Shanghai stock-based awards were expected to
be recognized over a weighted-average period of 2.1 years. Total recognized compensation cost may be adjusted for future changes in estimated forfeitures.

The following table summarizes the components of stock-based compensation expense included in the consolidated statements of comprehensive income (loss):

Stock-Based Compensation Expense:

Cost of revenue

Sales and marketing expense

Research and development expense

General and administrative expense

Stock-based compensation expense by type:

Employee stock option plan

Non-employee stock option plan

2019 and 2023 Subsidiary stock option plans

Year Ended December 31,

2023

2022

2021

$

$

1,406  $

520  $

5,684 

8,459 

11,789 

1,877 

2,565 

2,768 

27,338  $

7,730  $

397 

1,802 

1,115 

1,803 

5,117 

Year Ended December 31,

2023

2022

2021

$

$

6,213  $

7,346  $

46 

21,079 

46 

338 

27,338  $

7,730  $

4,674 

94 

349 

5,117 

NOTE 19 – INCOME TAXES

The following represent the U.S. and foreign components of income before income tax for the years ended December 31, 2023, 2022 and 2021:

U.S. federal

Foreign

Income before income taxes

Year Ended December 31,

2023

2022

2021

$

$

10,420  $

105,796 

116,216  $

(3,456) $

70,818 

67,362  $

(4,389)

47,444 

43,055 

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The following represent components of the income tax benefit (expense) for the years ended December 31, 2023, 2022 and 2021:

Current:

U.S. federal

U.S. state

Total U.S. current tax benefit (expense)

Foreign

Total current tax expense

Deferred:

U.S. federal

U.S. state

Total U.S. deferred tax benefit (expense)

Foreign

Total deferred tax benefit

Total income tax expense

Year Ended December 31,

2023

2022

2021

$

(12,757) $

(479) $

(150)

(12,907)

(19,696)

(32,603)

7,316 

63 

7,379 

5,860 

$

13,239 

(19,364) $

(18)

(497)

(11,139)

(11,636)

(10,927)

8 

(10,919)

5,757 

(5,162)

(16,798) $

(91)

(2)

(93)

(2,195)

(2,288)

2,089 

- 

2,089 

65 

2,154 

(134)

Tax effects of temporary differences that give rise to significant portions of the Company’s deferred tax assets at December 31, 2023 and 2022 are presented below:

Deferred tax assets:

Net operating loss carry forwards (offshore)

Net operating loss carry forwards (U.S.) and credit

Deferred revenue (offshore)

Accruals (U.S.)

Reserves and other (offshore)

Stock-based compensation (U.S.)

Stock-based compensation (offshore)

Lease liability

Total gross deferred tax assets

Less: valuation allowance

Total deferred tax assets

Deferred tax liabilities:

Fixed assets

Equity Investments and unrealized gain on short-term investments

Total deferred tax liabilities

Deferred tax assets, net

December 31,

2023

2022

$

11,499  $

4,930 

2,277 

3,632 

4,662 

2,455 

4,393 

1,252 

35,100 

(11,917)

23,183 

(1,325)

(1,587)

(2,912)

$

20,271  $

1,456 

1,246 

1,826 

100 

3,655 

2,060 

1,229 

414 

11,986 

(1,782)

10,204 

(443)

(3,059)

(3,502)

6,702 

The Company considers all available evidence to determine whether it is more likely than not that some portion or all of the deferred tax assets will be realized. The ultimate realization of deferred
tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become realizable. Management considers the scheduled reversal of
deferred tax liabilities (including the impact of available carryback and carry-forward periods), and projected taxable income in assessing the realizability of deferred tax assets. In making such
judgments, significant weight is given to evidence that can be objectively verified. Based on all available evidence, a partial valuation allowance

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has been established against some net deferred tax assets as of December 31, 2023 and 2022, based on estimates of recoverability. In order to fully realize the deferred tax assets, the Company must
generate sufficient taxable income in future periods before the expiration of the deferred tax assets governed by the tax code.

As of December 31, 2023 and 2022, the Company had valuation allowances, respectively, of $29 and $49 for U.S. federal purposes, $279 and $277 for U.S. state purposes and $11,585 and $1,456
for mainland China income tax purposes.

As of December 31, 2023 and 2022, the Company had net operating loss carry-forwards of, respectively, $3,121 and $4,385 for U.S. federal purposes, $593 and $545 for U.S. state purposes and
$46,467 and $6,474 for mainland China income tax purposes. Such losses begin expiring in 2036, 2032 and 2025 for U.S. federal, U.S. state and mainland China income tax purposes, respectively.

Under provisions of the U.S. Internal Revenue Code (the “IRC”), a limitation applies to the use of the U.S. net operating loss and credit carry-forwards that would be applicable if ACM experiences
an “ownership change,” as defined in IRC Section 382. ACM conducted an analysis of its stock ownership under IRC Section 382 and $3,121 of the net operating loss carryforwards are subject to
annual limitation as a result of the ownership change in 2017. The net operating loss carryforwards are not expected to expire before utilization.

The  Company’s  effective  tax  rate  differs  from  statutory  rates  of  21%  for  U.S.  federal  income  tax  purposes  and  12.5%  to  25%  for  mainland  China  income  tax  purpose  due  to  the  effects  of  the
valuation allowance and certain permanent differences as they pertain to book-tax differences in employee stock-based compensation and non-US research expense. A new requirement to capitalize
and  amortize  previously  deductible  research  and  experimental  expenses  resulting  from  a  change  in  Section  174  made  by  the  Tax  Cuts  and  Jobs  Act  of  2017  (the  “TCJA”)  became  effective  on
January  1,  2022.  Under  the  TCJA,  the  Company  is  required  to  capitalize,  and  subsequently  amortize  R&D  expenses  over  fifteen  years  for  research  activities  conducted  outside  of  the  U.S.  The
capitalization of overseas R&D expenses resulted in a significant increase in the Company’s global intangible low-taxed income inclusion beginning in 2022. Pursuant to the Corporate Income Tax
Law of mainland China, all of the Company’s mainland China subsidiaries are liable to mainland China Corporate Income Taxes at a rate of 25%, except for ACM Shanghai and ACM Lingang.
According to Guoshuihan 2009 No. 203, an entity certified as an “advanced and new technology enterprise” is entitled to a preferential income tax rate of 15%. ACM Shanghai was certified as an
“advanced and new technology enterprise” in 2012 and again in 2016, 2018, and 2021, effective until December 31, 2023, and is expected to be re-certified for future years in 2024. In 2022, ACM
Shanghai was certified as an eligible integrated circuit production enterprise and was entitled to a preferential income tax rate of 12.5% from January 1, 2020 to December 31, 2022. Certain entities
which meet requirements according to the Policy of the Lingang New area in China (Shanghai) Pilot Free Trade Zone are entitled to a preferential income tax rate of 15%. ACM Lingang was
certified for this in 2021, and this preferential income tax rate is valid from January 1, 2020 until December 31, 2024. The provision for mainland China corporate income tax for ACM Shanghai is
calculated by applying the income tax rate of 15% for the year ended December 31, 2023 and 12.5% for the years ended December 31, 2022 and 2021.

Income tax expense for the years ended December 31, 2023, 2022 and 2021 differed from the amounts computed by applying the statutory U.S. federal income tax rate of 21% to pretax income as a
result of the following:

Effective tax rate reconciliation:

Income tax provision at statutory rate

Stock Compensation

Foreign rate differential

Other permanent difference

Foreign income taxed in US

Foreign Research Expense

Change in valuation allowance

Total income tax expense

Year Ended December 31,

2023

2022

2021

21.00 %

21.00 %

21.00 %

(2.00)

(10.47)

0.03 

7.39 

(8.01)

8.72 

(2.72)

(9.43)

(0.26)

19.86 

(4.79)

1.28 

(12.75)

(11.60)

(0.23)

10.32 

(6.59)

0.16 

16.66 %

24.94 %

0.31 %

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Tax positions are evaluated in a two-step process. The Company first determines whether it is more likely than not that a tax position will be sustained upon examination. If a tax position meets the
more-likely-than-not recognition threshold it is then measured to determine the amount of benefit to recognize in the financial statements. The tax position is measured as the largest amount of
benefit that is greater than 50% likely of being realized upon ultimate settlement. The aggregate changes in the balance of gross unrecognized tax benefits, which excludes interest and penalties, for
the years ended December 31, 2023 and 2022, were as follows:

Beginning balance

Increase of unrecognized tax benefits taken in prior years

Increase of unrecognized tax benefits related to current year

Reductions for tax positions related to prior years

Ending balance

Year Ended December 31,

2023

2022

2021

$

$

8,448  $

6,066  $

199 

4,379 

— 

— 

2,623 

(241)

13,026  $

8,448  $

570 

52 

5,476 

(32)

6,066 

The Company is subject to taxation in the United States, state, and foreign jurisdictions. All tax returns will remain open for examination by the federal and state authorities for three and four years,
respectively, from the date of utilization of any net operating loss or credits. Certain tax years are subject to foreign income tax examinations by tax authorities until the statute of limitations expire.

The Company had $13,026 and $8,448 of unrecognized tax benefits as of December 31, 2023 and 2022, respectively.

The Company recognizes interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2023 and 2022, respectively, the Company had $1,667 and $508 of
accrued penalties related to uncertain tax positions, all of which was recognized in the Company’s consolidated statements of comprehensive income (loss) for the year then ended. The amount of
the  unrecognized  tax  benefit  that,  if  recognized,  would  impact  the  effective  tax  rate  was  $12,943  as  of  December  31,  2023.  There  were  no  ongoing  examinations  by  taxing  authorities  as  of
December 31, 2023 or 2022.

Prior to the Tax Cuts and Jobs Act of 2017 (the "Tax Act"), the Company asserted that all unremitted earnings of its foreign subsidiaries were considered indefinitely reinvested. As a result of the
Tax Act, the Company reported and paid U.S. tax on the majority of its previously unremitted foreign earnings, and repatriations of foreign earnings will generally be free of U.S. federal tax, but
may incur other taxes such as withholding or state taxes. As of December 31, 2023, the Company has not made a provision for U.S. or additional foreign withholding taxes on approximately $130
million  of  undistributed  earnings  of  its  foreign  subsidiaries  that  is  indefinitely  reinvested.  Generally,  such  amounts  become  subject  to  U.S.  taxation  upon  the  remittance  of  dividends  and  under
certain other circumstances.

NOTE 20 – SEGMENT INFORMATION

The Company identifies operating segments according to how the business activities are managed and evaluated. The Company’s chief operating decision maker (“CODM”) has been identified as
ACM’s Chief Executive Officer. The Company's operating segments include ACM Research and ACM Shanghai. As the Company is engaged in the developing, manufacture and sale of capital
equipment to global semiconductor manufacturers, and each of the operating segments share similar economic and other qualitative characteristics, the results of the Company’s operating segments
are aggregated into one reportable segment.

For geographical reporting, revenue by geographic location is determined by the location of customers’ facilities to which products were shipped. Long-lived assets consist primarily of property,
plant and equipment, other long-term assets, and

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right-of-use assets and are attributed to the geographic location in which they are located. Long-lived assets by geographic region as of the years ended were as follows:

Long-lived assets by geography:

Mainland China

Korea

United States

Total

NOTE 21 – COMMITMENTS AND CONTINGENCIES

December 31,

2023

2022

$

$

209,725  $

12,190 

1,276 

223,191  $

140,481 

3,830 

10 

144,321 

The Company leases offices and manufacturing locations under non-cancelable operating lease agreements. See note 11 for future minimum lease payments under non-cancelable operating lease
agreements with initial terms of one year or more.

As of December 31, 2023, the Company had $30,936 of open commitments to construction contracts and had additional $7,413 of capital investment commitments.

Covenants in ACM Shengwei’s Grant Contract for State-owned Construction Land Use Right in Shanghai City (Category of R&D Headquarters and Industrial Projects) with the China (Shanghai)
Pilot  Free  Trade  Zone  Lingang  Special  Area  Administration  require,  among  other  things,  that  ACM  Shengwei  pay  liquidated  damages  in  the  event  that  (a)  it  does  not  make  a  total  investment
(including the costs of construction, fixtures, equipment and grant fees) of at least RMB 450.0 million ($63,400) or (b) within six years after the land use right is obtained, the Company does not (i)
generate  a  minimum  specified  amount  of  annual  sales  of  products  manufactured  on  the  granted  land  or  (ii)  pay  to  mainland  China  at  least  RMB  157.6  million  ($22,000)  in  annual  total  taxes
(including value-added taxes, corporate income tax, personal income taxes, urban maintenance and construction taxes, education surcharges, stamp taxes, and vehicle and shipping taxes) as a result
of operations in connection with the granted land.

As of December 31, 2023 and December 31, 2022, the Company had incurred in total $116,932 and $35,376, respectively for its Lingang-related investments. The Construction Completion
Milestone was required to be met by January 9, 2024 but was not achieved. However, ACM Lingang believes it will receive the refund without penalty based on its explanation to the respective
regulatory authorities of logistics-related delays, and expectations that it will meet the milestone before July 9, 2024. The Company cannot guarantee that ACM Lingang will achieve the missed
milestone in 2024, or even if it does achieve the milestone in 2024, that it will be refunded some or all of the 20% portion of the performance deposit of RMB 2.5 million ($0.4 million).

In the normal course of business, the Company is subject to contingencies, including legal proceedings and environmental claims arising out of the normal course of businesses that relate to a wide
range of matters, including among others, contracts breach liability. The Company records accruals for such contingencies based upon the assessment of the probability of occurrence and, where
determinable, an estimate of the liability. Management may consider many factors in making these assessments including past history, scientific evidence and the specifics of each matter. Some of
these contingencies involve claims that are subject to substantial uncertainties and unascertainable damages.

The Company’s management has evaluated all such proceedings and claims that existed as of December 31, 2023 and 2022. In the opinion of management, no provision for liability nor disclosure
was required as of December 31, 2023 related to any claim against the Company because: (a) there is not a reasonable possibility that a loss exceeding amounts already recognized (if any) may be
incurred with respect to such claim; (b) a reasonably possible loss or range of loss cannot be estimated; or (c) such estimate is immaterial.

As of December 31, 2023, the Company had no outstanding legal proceedings.

NOTE 22 – PARENT COMPANY ONLY CONDENSED FINANCIAL INFORMATION

The Company performed a test on the restricted net assets of consolidated subsidiaries in accordance with Rule 4-08(e)(3) of Regulation S-X of the SEC and concluded that it was applicable for the
Company to disclose the financial information

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for ACM only. Certain information and footnote disclosures generally included in financial statements prepared in accordance with GAAP have been condensed or omitted. The footnote disclosure
contains supplemental information relating to the operations of ACM separately.

ACM Shanghai paid a dividend to ACM during the year ended December 31, 2023 (Note 2).

Except for long-term obligations, or guarantees, and loan borrowed by ACM Inc. from CITIC. (note 12), ACM does not have significant capital or other commitments, as of December 31, 2023 or
2022.

The following represents condensed unconsolidated financial information of ACM only as of December 31, 2023 and 2022, and for the years ended December 31, 2023, 2022 and 2021:

CONDENSED BALANCE SHEETS

Assets

Current assets:

Cash and cash equivalents

Accounts receivable

Due from intercompany

Other receivable

Prepaid expenses

Total current assets

Deferred tax assets

Property, plant and equipment, net

Investment in consolidated subsidiaries and equity method investee

Total assets

Liabilities and Stockholders’ Equity

Loan borrowings

Accounts payable

Other payables

Income taxes payable

FIN-48 payable

Total liabilities

Total stockholders’ equity

Total liabilities and stockholder’s equity

126

December 31,

2023

2022

$

$

$

$

41,616  $

988 

3,176 

5,803 

385 

51,968 

20,271 

134 

733,382 

805,755  $

14,120  $

524  $

5,176 

6,402 

12,149 

38,371 

767,384 

805,755  $

23,853 

24 

- 

5,017 

134 

29,028 

6,703 

- 

653,926 

689,657 

— 

236 

4,409 

3,469 

6,686 

14,800 

674,857 

689,657 

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CONDENSED STATEMENTS OF OPERATIONS

Revenue

Cost of revenue

Gross profit

Operating expenses:

Sales and marketing expenses

General and administrative expenses

Loss from operations

Equity in earnings of consolidated subsidiaries and equity method investees

Interest income, net

Interest expense, net

Other income, net

Income before income taxes

Income tax benefit

Net income

CONDENSED STATEMENTS OF CASH FLOWS

Net cash provided by (used in) operating activities

Net cash used in investing activities

Net cash provided by financing activities

Net increase (decrease) in cash and cash equivalents

Cash and cash equivalents, beginning of year

Cash and cash equivalents, end of year

Year Ended December 31,

2023

2022

2021

6,354  $

(4,336)

2,018 

(4,715)

(7,840)

(10,537)

73,707 

799 

(66)

18,476 

82,379 

(5,030)

569  $

- 

569 

(3,193)

(5,421)

(8,045)

32,145 

57 

(7)

2,148 

26,298 

12,965 

77,349  $

39,263  $

Year Ended December 31,

2023

2022

2021

1,489  $

(5,997) $

(149)

16,423 

17,763 

23,853 

(1,000)

1,314 

(5,683)

29,536 

41,616  $

23,853  $

16 

— 

16 

(2,443)

(5,116)

(7,543)

43,866 

54 

- 

1,380 

37,757 

- 

37,757 

(5,902)

- 

5,250 

(652)

30,188 

29,536 

$

$

$

$

Item 9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

Dismissal of Previous Independent Registered Public Accounting Firm

On  July  21,  2023,  we  were  informed  by  Armanino  that  it  would  resign  as  our  independent  auditor  effective  as  of  the  earlier  of  (a)  the  date  we  engaged  a  new  independent  registered  public
accounting firm or (b) the filing of our Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2023. Armanino advised us that its decision to resign was due to Armanino’s
decision to exit from the practice of providing financial statement audit services to all public companies. Armanino is not required to and did not seek our consent to its decision to resign as our
independent registered public accounting firm. As a result, neither our Board of Directors nor the Audit Committee participated in Armanino’s decision to resign.

In light of Armanino’s determination, the Audit Committee initiated a process to select and appoint a new accounting firm to serve as our independent registered public accountant commencing with
the audit of our financial statements for the fiscal year ended December 31, 2023.

Armanino’s audit report on our consolidated financial statements as of and for the year ended December 31, 2022 did not contain an adverse opinion or a disclaimer of opinion, and was not qualified
or modified as to uncertainty, audit scope or accounting principles. Armanino was first appointed as our independent registered public accountant for the fiscal year ended December 31, 2022, and
did not audit our financial statements for the fiscal year ended December 31, 2021 or any prior period.

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As disclosed in this report and in our Annual Report on Form 10-K for the fiscal year ended December 31, 2022, Armanino issued an adverse opinion on our internal control over financial reporting
for the fiscal year ended December 31, 2022, as a result of material weaknesses identified by Armanino and our management. There were not any disagreements or differences of opinion between
Armanino and us with respect to these material weaknesses or Armanino’s adverse opinion on our internal control over financial reporting.

During the year ended December 31, 2022, and through the date of Armanino’s notification of resignation, there were no (a) disagreements with Armanino on any matter of accounting principles or
practices, financial statement disclosure, or auditing scope or procedure, which disagreements, if not resolved to Armanino’s satisfaction, would have caused Armanino to make reference to the
subject matter thereof in connection with its reports for such periods; or (b) except as described in the preceding paragraph, reportable events, as described under Item 304(a)(1)(v) of Regulation S-
K.

We provided a copy of the foregoing disclosures to Armanino and requested that Armanino furnish us with a letter addressed to the SEC, pursuant to Item 304(a)(3) of Regulation S-K, stating
whether or not Armanino agreed with the above disclosures. A copy of Armanino’s letter dated July 27, 2023 furnished pursuant to that request is filed as Exhibit 16.01.

Engagement of New Independent Registered Public Accounting Firm

On September 14, 2023, the Audit Committee completed a competitive selection process to select and appoint a new accounting firm to serve as our independent registered public accounting firm
commencing with the audit of our financial statements for the fiscal year ended December 31, 2023. As a result of this process, the Audit Committee approved the engagement of Ernst & Young
Hua Ming LLP as our independent registered public accounting firm for the fiscal year ended December 31, 2023. The engagement of Ernst & Young Hua Ming LLP became effective on September
20, 2023.

During the fiscal years ended December 31, 2022 and 2021 and the subsequent interim period from January 1, 2023 through September 20, 2023, neither we nor anyone on our behalf consulted with
Ernst  &  Young  Hua  Ming  LLP  regarding  either:  (a)  the  application  of  accounting  principles  to  a  specified  transaction,  either  completed  or  proposed,  or  the  type  of  audit  opinion  that  might  be
rendered on our financial statements, and no written report or oral advice was provided to us that Ernst & Young Hua Ming LLP concluded was an important factor considered by us in reaching a
decision as to any accounting, auditing or financial reporting issue; or (b) any matter that was either the subject of a “disagreement” or a “reportable event”, as such terms are defined in Items 304(a)
(1)(iv) and (v), respectively, of Regulation S‑K and the related instructions.

As previously disclosed in our Current Report on Form 8-K filed on July 27, 2023, Armanino informed us that it would resign as our independent registered public accounting firm effective as of
the earlier of (a) the date we engaged a new independent registered public accounting firm or (b) the filing of our Quarterly Report on Form 10-Q for the fiscal quarter ended September 30, 2023, as
a result of Armanino’s decision to exit from the practice of providing financial statement audit services to all public companies. As a result, Armanino ceased to serve as our independent registered
public accounting firm effective as of September 20, 2023.

We provided a copy of the foregoing disclosures to Armanino and requested that Armanino furnish us with a letter addressed to the SEC, pursuant to Item 304(a)(3) of Regulation S-K, stating
whether or not Armanino agreed with the above disclosures. A copy of Armanino’s letter dated September 26, 2023 furnished pursuant to that request is filed as Exhibit 16.02.

Item 9A.    Controls and Procedures

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and our Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures pursuant to Rule 13a-15
under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). In designing and evaluating the disclosure controls and procedures, our management recognizes that any controls and
procedures,  no  matter  how  well  designed  and  operated,  can  provide  only  reasonable  assurance  of  achieving  the  desired  control  objectives.  In  addition,  the  design  of  disclosure  controls  and
procedures must reflect the fact that there are resource constraints and that our management is required to apply its judgment in evaluating the benefits of possible controls and procedures relative to
their costs.

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Based on this evaluation, our Chief Executive Officer and our Chief Financial Officer concluded that, as of December 31, 2023, our disclosure controls and procedures were designed at a reasonable
assurance level and were effective to provide reasonable assurance that the information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed,
summarized  and  reported  within  the  time  periods  specified  in  the  SEC  rules  and  forms,  and  that  such  information  is  accumulated  and  communicated  to  our  management,  including  our  Chief
Executive Officer and our Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosures.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is a process designed by, or under the
supervision of, our Chief Executive Officer and Chief Financial Officer to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for
external purposes in accordance with generally accepted accounting principles and includes those policies and procedures that (1) pertain to the maintenance of records that in reasonable detail
accurately and fairly reflect the transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements
in accordance with generally accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors and (3)
provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements.

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our
internal  control  over  financial  reporting  based  on  criteria  established  in  Internal  Control  –  Integrated  Framework  (2013)  issued  by  the  Committee  of  Sponsoring  Organizations  of  the  Treadway
Commission (“COSO”). Our management concluded that our internal control over financial reporting was effective as of December 31, 2023.

Attestation Report of Independent Registered Public Accounting Firm

The effectiveness of our internal control over financial reporting as of December 31, 2023 has been tested by Ernst & Young Hua Ming LLP, our independent registered public accounting firm, as
stated in their report which is included in Part II, Item 8 of this report.

Remediation of Previously Reported Material Weaknesses

As previously reported in our Forms 10-Q for the quarters ended March 31, 2023, June 30, 2023 and September 30, 2023, and our Annual Report on Form 10-K for the year ended December 31,
2022, we previously identified the following material weaknesses in internal control over financial reporting:

(i) Management did not design and maintain effective risk assessment procedures, and monitoring activities. These deficiencies were attributed to insufficient identification and assessment of risks
impacting the design, implementation, and operating effectiveness of internal control over financial reporting, and insufficient evaluation and determination as to whether components of internal
control were present and functioning; and
(ii) Management did not design and maintain effective information technology controls related to (a) user access controls to ensure appropriate segregation of duties and adequately restrict user and
privileged  access  to  financial  applications,  programs,  and  data  to  appropriate  personnel,  (b)  computer  operations  controls  to  ensure  that  critical  information  is  monitored,  and  data  backups  are
authorized and monitored, (c) appropriate controls to evaluate automated controls, and (d) appropriate controls to validate the completeness and accuracy of key reports used within controls across
substantially all financial statement areas.

These  material  weaknesses  did  not  result  in  any  material  misstatement  of  our  consolidated  financial  statements  as  of  and  for  the  year  ended  December  31,  2022.  Our  management,  under  the
oversight of the Audit Committee, has implemented the following remediation steps to address previously disclosed material weaknesses and to improve our internal control over financial reporting:

•

Engaged a third-party Sarbanes-Oxley (“SOX”) compliance firm to assist management with (i) designing and maintaining effective risk assessment procedures and monitoring activities,
(ii) reviewing our current processes, procedures, and systems and assessing the design of controls to identify opportunities to enhance the design of controls that would address relevant
risks  identified  by  management  to  assure  the  operating  effectiveness  of  internal  control  over  financial  reporting,  and  (iii)  enhancing  and  implementing  protocols  to  retain  sufficient
documentary evidence of operating effectiveness of such controls.

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•

Recruited qualified individuals for key positions within our internal audit, IT, and other support functions that have enhanced internal control capabilities, promoted segregation of duties,
and provided appropriate oversight and reviews.

• Developed and delivered internal control training to management and finance/accounting personnel, focusing on a review of management and individual roles and responsibilities related to

•

internal control over financial reporting.
Restricted  and  monitored  user  access  controls  to  ensure  appropriate  segregation  of  duties  and  adequately  restricted  user  and  privileged  access  of  applications,  programs,  and  data  to
appropriate personnel; implemented computer operations controls to ensure that critical information is monitored, and data backups are authorized and monitored; established appropriate
controls to evaluate automated controls; and designed and monitored appropriate controls to validate the completeness and accuracy of key reports used within controls across substantially
all financial statement areas.

During the quarter ended December 31, 2023, we completed our testing of the operating effectiveness of internal controls impacted by these remediation efforts and determined that as a result of the
measures described above, the material weaknesses have been remediated as of December 31, 2023.

Changes in Internal Control over Financial Reporting

Other than in connection with the remediation process described above, no change in our internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange
Act) occurred during the most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Item 9B.    Other Information

On December 13, 2023, Sotheara Cheav, Senior Vice President, Manufacturing of ACM Shanghai, adopted a Rule 10b5-1 trading arrangement, or the Cheav Plan, that is intended to satisfy the
affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Cheav Plan allows for the sale of up to 10,000 shares of Class A common stock, at specific market prices, commencing on the later
of March 13, 2024 or the third business day following the disclosure of the Issuer’s financial results for the completed fiscal quarter in which the Cheav Plan was adopted, and continuing until (i) all
such shares are sold, (ii) December 4, 2024, or (iii) such date that the Cheav Plan is otherwise terminated according to its terms, whichever comes first.

Item 9C.    Disclosure Regarding Foreign Jurisdictions that Prevent Inspections

(a) ACM Research was identified by the SEC pursuant to Section 104(i)(2)(A) of the Sarbanes-Oxley Act of 2002 (15 U.S.C. 7214(i)(2)(A)) as having retained, for the preparation of the audit report
on its financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2021, a registered public accounting firm that has a branch or office that is located in a
foreign jurisdiction and that the PCAOB had then determined it was unable to inspect or investigate completely because of a position taken by an authority in the foreign jurisdiction, which
determination was vacated by the PCAOB on December 15, 2022. ACM Research herein confirms that it is not owned or controlled by any governmental entity in such foreign jurisdiction.

(b) Not applicable.

PART III

Item 10.    Directors, Executive Officers and Corporate Governance

Information responsive to this item is incorporated herein by reference to our definitive proxy statement with respect to our 2024 Annual Meeting of Stockholders to be filed with the SEC within
120 days after the end of the fiscal year covered by this report.

Item 11.    Executive Compensation

Information responsive to this item is incorporated herein by reference to our definitive proxy statement with respect to our 2024 Annual Meeting of Stockholders to be filed with the SEC within
120 days after the end of the fiscal year covered by this report.

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Table of Contents

Item 12.    Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

Information responsive to this item is incorporated herein by reference to our definitive proxy statement with respect to our 2024 Annual Meeting of Stockholders to be filed with the SEC within
120 days after the end of the fiscal year covered by this report.

Item 13.     Certain Relationships and Related Transactions, and Director Independence

Information responsive to this item is incorporated herein by reference to our definitive proxy statement with respect to our 2024 Annual Meeting of Stockholders to be filed with the SEC within
120 days after the end of the fiscal year covered by this report.

Item14.     Principal Accounting Fees and Services

Information responsive to this item is incorporated herein by reference to our definitive proxy statement with respect to our 2024 Annual Meeting of Stockholders to be filed with the SEC within
120 days after the end of the fiscal year covered by this report.

PART IV

Item 15.     Exhibits and Financial Statement Schedules

(a)

(b)

Exhibit
No.

3.01(a)
3.01(b)

3.02
4.01

4.02

4.03

4.04‡

4.05
10.01(a)

10.01(b)

10.01(c)

See “Item 8. Financial Statements and Supplementary Data – Index to Consolidated Financial Statements” of Part II above and “Exhibit Index” below.

Exhibits.

Description

Restated Certificate of Incorporation of ACM Research, Inc. (incorporated herein by reference to Exhibit 3.01 to the Current Report on Form 8-K filed on November 14, 2017)
Certificate of Amendment to Restated Certificate of Incorporation of ACM Research, Inc., dated July 13, 2021 (incorporated herein by reference to Exhibit 3.01 to the Current
Report filed on July 13, 2021)
Restated Bylaws of ACM Research, Inc. (incorporated herein by reference to Exhibit 3.02 to the Current Report on Form 8-K filed on November 14, 2017)
Senior  Secured  Promissory  Note  dated  March  30,  2018  issued  by  Shengxin  (Shanghai)  Management  Consulting  Limited  Partnership  to  ACM  Research  (Shanghai),  Inc.
(incorporated herein by reference to Exhibit 10.03 to the Quarterly Report on Form 10-Q filed on May 14, 2018)
Intercompany Promissory Note dated March 30, 2018 issued by ACM Research (Shanghai), Inc. to ACM Research, Inc. (incorporated herein by reference to Exhibit 10.04 to
the Quarterly Report on Form 10-Q filed on May 14, 2018)
Warrant Exercise Agreement dated March 30, 2018 by and among ACM Research, Inc., ACM Research (Shanghai), Inc., and Shengxin (Shanghai) Management Consulting
Limited Partnership (incorporated herein by reference to Exhibit 10.02 to the Quarterly Report on Form 10-Q filed on May 14, 2018)
Warrant to Purchase Class A Common Stock issued to Shengxin (Shanghai) Management Consulting Limited Partnership dated July 29, 2020 (incorporated herein by reference
to Exhibit 4.01 to the Quarterly Report on Form 10-Q filed on August 10, 2020)
Description of ACM Research, Inc.’s Securities
Lease dated March 22, 2017 between ACM Research, Inc. and D&J Construction, Inc. (incorporated herein by reference to Exhibit 10.01 to the Registration Statement on
Form S-1 filed on September 13, 2017)
Lease  Amendment  dated  February  28,  2018  between  ACM  Research,  Inc.  and  D&J  Construction,  Inc.  (incorporated  herein  by  reference  to  Exhibit  10.06  to  the  Amended
Quarterly Report on Form 10-Q/A filed on October 15, 2018)
Lease Amendment dated February 4, 2019 between ACM Research, Inc. and D&J Construction, Inc. (incorporated herein by reference to Exhibit 10.1 to the Current Report on
Form 8-K filed on February 8, 2019)

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Table of Contents

10.01(d)

10.01(e)
10.02

10.03

10.04

10.05

10.06

10.07

10.08

10.08(a)

10.09

10.09(a)

10.10

10.11
10.11(a)+

10.11(b)+

10.11(c)+

10.12+

10.13+

Lease Amendment dated January 4, 2021 between ACM Research, Inc. and D&J Construction, Inc. (incorporated herein by reference to Exhibit 10.01(d) to the Annual Report
on Form 10-K filed on March 1, 2022)
Lease Amendment dated February 1, 2023 between ACM Research, Inc. and D&J Construction, Inc
Lease Agreement dated April 26, 2018 between ACM Research (Shanghai), Inc. and Shanghai Zhangjiang Group Co., Ltd. (incorporated herein by reference to Exhibit 10.01
to the Amended Quarterly Report on Form 10-Q/A filed on October 15, 2018)
Lease Agreement dated January 18, 2018 between ACM Research (Shanghai), Inc. and Shanghai Shengyu Culture Development Co., Ltd. (incorporated herein by reference to
Exhibit 10.05 to the Amended Quarterly Report on Form 10-Q/A filed on October 15, 2018)
Securities  Purchase  Agreement  dated  March  14,  2017  by  and  among  ACM  Research,  Inc.,  Shengxin  (Shanghai)  Management  Consulting  Limited  Partnership  and  ACM
Research (Shanghai), Inc. (incorporated herein by reference to Exhibit 10.03 to the Registration Statement on Form S-1 filed on September 13, 2017)
Securities Purchase Agreement dated March 23, 2017 between ACM Research, Inc. and Shanghai Science and Technology Venture Capital Co., Ltd., as amended (incorporated
herein by reference to Exhibit 10.04 to the Amended Registration Statement on Form S-1/A filed on October 18, 2017)
Ordinary Share Purchase Agreement dated September 6, 2017 by and among ACM Research, Inc., Ninebell Co., Ltd. and Moon-Soo Choi (incorporated herein by reference to
Exhibit 10.07 to the Amended Registration Statement on Form S-1/A filed on October 18, 2017)
Stock Purchase Agreement, dated October 11, 2017, by and among ACM Research, Inc., Xinxin (Shanghai) Capital Co., Limited, Xinxin (Hongkong) Capital Co., Limited and
David H. Wang (incorporated herein by reference to Exhibit 10.10 to the Amended Registration Statement on Form S-1/A filed on October 18, 2017)
Form of Capital Increase Agreement between ACM Research, Inc. and certain investors (incorporated herein by reference to Exhibit 10.01 to the Quarterly Report on Form 10-
Q filed on August 12, 2019)
Schedule identifying agreements substantially identical to the form of Capital Increase Agreement filed as Exhibit 10.12 hereto (incorporated herein by reference to Exhibit
10.01(a) to the Quarterly Report on Form 10-Q filed on August 12, 2019)
Form  of  Agreement  between  ACM  Research,  Inc.  and  certain  Investors  (incorporated  herein  by  reference  to  Exhibit  10.02  to  the  Quarterly  Report  on  Form  10-Q  filed  on
August 12, 2019)
Schedule  identifying  agreements  substantially  identical  to  the  form  of  Agreement  filed  as  Exhibit  10.13  hereto  (incorporated  herein  by  reference  to  Exhibit  10.02(a)  to  the
Quarterly Report on Form 10-Q filed on August 12, 2019)
Partnership Agreement of Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) dated September 5, 2019 by and among Infotech National
Emerging Industry Venture Investment Guidance Fund (LP), Hefei Guozheng Asset Management Co, Ltd., Hefei Economic and Technological Development Zone Industrial
Investment Guidance Fund Co., Ltd., ACM Research (Shanghai), Inc., Hefei Tongyi Equity Investment Partnership (LP), Shenzen Waitan Technology Development Co., Ltd.,
and Beijing Shixi Qingliu Investment Co., Ltd. (incorporated herein by reference to Exhibit 10.03 to the Quarterly Report on Form 10-Q filed on November 13, 2019)
2016 Omnibus Incentive Plan of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.01 to the Quarterly Report on Form 10-Q filed on December 8, 2017)
Form of Incentive Stock Option Grant Notice and Agreement under 2016 Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.10(a) to the Registration
Statement on Form S-1 filed on September 13, 2017)
Form of Non-qualified Stock Option Grant Notice and Agreement under 2016 Omnibus Incentive Plan (incorporated herein by reference to Exhibit 10.10(b) to the Registration
Statement on Form S-1 filed on September 13, 2017)
Form  of  Restricted  Stock  Unit  Grant  Notice  and  Agreement  under  2016  Omnibus  Incentive  Plan  (incorporated  herein  by  reference  to  Exhibit  10.10(c)  to  the  Registration
Statement on Form S-1 filed on September 13, 2017)
Form of Nonstatutory Stock Option Agreement of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.11 to the Registration Statement on Form S-1 filed on
September 13, 2017)
1998 Stock Option Plan of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.12 to the Registration Statement on Form S-1 filed on September 13, 2017)

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Table of Contents

10.13(a)+

10.13(b)+

10.14

10.15

10.16+‡

10.17

10.18(a)

10.18(b)

10.19‡†

10.20†

10.21†

10.22†

10.23†

10.24‡†

10.25†

10.26‡†

10.27†

10.28†

10.29†

Form of Incentive Stock Option Agreement under 1998 Stock Option Plan (incorporated herein by reference to Exhibit 10.12(a) to the Registration Statement on Form S-1
filed on September 13, 2017)
Form of Non-statutory Stock Option Agreement under 1998 Stock Option Plan (incorporated herein by reference to Exhibit 10.12(b) to the Registration Statement on Form S-1
filed on September 13, 2017)
Form of Indemnification Agreement entered into between ACM Research, Inc. and certain of its directors and officers (incorporated herein by reference to Exhibit 10.13 to the
Registration Statement on Form S-1 filed on September 13, 2017)
Letter agreement dated June 12, 2019 between ACM Research, Inc. and Mark McKechnie (incorporated herein by reference to Exhibit 10.02 to the Current Report on Form 8-
K filed on August 13, 2019)
Employment Agreement dated September 25, 2022 between ACM Research (Shanghai), Inc. and Lisa Feng (incorporated herein by reference to Exhibit 10.01 to the Quarterly
Report on Form 10-Q filed on May 9, 2023)
Note  Assignment  and  Cancellation  Agreement  dated  April  30,  2020  by  and  among  ACM  Research,  Inc.,  ACM  Research  (Shanghai),  Inc.  and  Shengxin  (Shanghai)
Management Consulting Limited Partnership (incorporated herein by reference to Exhibit 10.02 to the Quarterly Report Form 10-Q filed on May 8, 2020)
Share Transfer and Note Cancellation Agreement dated April 30, 2020 between ACM Research, Inc. and Shengxin (Shanghai) Management Consulting Limited Partnership
(incorporated herein by reference to Exhibit 10.03 to the Quarterly Report on Form 10-Q filed on May 8, 2020)
Amendment No. 1 to Share Transfer and Note Cancellation Agreement dated July 29, 2020 between ACM Research, Inc. and Shengxin (Shanghai) Management Consulting
Limited Partnership (incorporated herein by reference to Exhibit 10.01 to the Quarterly Report on Form 10-Q filed on November 9, 2020)
Grant Contract for State-owned Construction Land Use Right in Shanghai City (Category of R&D Headquarters and Industrial Projects) dated as of May 7, 2020 between
ACM Research (Lingang), Inc. and China (Shanghai) Pilot Free Trade Zone Lin-gang Special Area Administration (incorporated herein by reference to Exhibit 10.01 to the
Current Report on Form 8-K filed on May 13, 2020)
Commitment Letter Regarding the Lock-up of Shares, effective as of May 26, 2020, of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.01 to the Current
Report on Form 8-K filed on June 1, 2020)
Commitment Letter Regarding Shareholding Intent and Intent to Reduce Shareholding, effective as of May 26, 2020, of ACM Research, Inc. and David H. Wang (incorporated
herein by reference to Exhibit 10.02 to the Current Report to Form 8-K filed on June 1, 2020)
Commitment Letter Regarding the Plan and Binding Measures for Stabilizing the Stock Price of ACM Research (Shanghai), Inc. Within Three Years After Listing, effective as
of May 26, 2020, of ACM Research, Inc., ACM Research (Shanghai), Inc., and certain individuals named therein (incorporated herein by reference to Exhibit 10.03 to the
Current Report on Form 8-K filed on June 1, 2020)
Commitment Letter Regarding Fraudulent Issuance of Listed Shares, effective as of May 26, 2020, of ACM Research, Inc., ACM Research (Shanghai), Inc. and David H.
Wang (incorporated herein by reference to Exhibit 10.04 to the Current Report on Form 8-K filed on June 1, 2020)
Commitment Letter Regarding the Lack of False Records, Misleading Statements or Major Omissions in the Preliminary Information Document, effective as of May 26, 2020,
of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.05 to the Current Report on Form 8-K filed on June 1, 2020)
Commitment Letter Regarding Making Up for Diluted Immediate Returns, effective as of May 26, 2020, of ACM Research, Inc. (incorporated herein by reference to Exhibit
10.06 to the Current Report on Form 8-K filed on June 1, 2020)
Commitment Letter Regarding Unfulfilled Commitment on Binding Measures, effective as of May 26, 2020, of ACM Research, Inc. and David H. Wang (incorporated herein
by reference to Exhibit 10.07 to the Current Report on Form 8-K filed on June 1, 2020)
Commitment Letter Regarding the Avoidance of Competition in the Same Industry, effective as of May 26, 2020, of ACM Research, Inc. (incorporated herein by reference to
Exhibit 10.08 to the Current Report on Form 8-K filed on June 1, 2020)
Commitment  Letter  Regarding  the  Standardization  and  Reduction  of  Related  Transactions,  effective  as  of  May  26,  2020,  of  ACM  Research,  Inc.  (incorporated  herein  by
reference to Exhibit 10.09 to the Current Report on Form 8-K filed on June 1, 2020)
Commitment  Letter  Regarding  the  Avoidance  of  Funds  Occupation  and  Illegal  Guarantee,  effective  as  of  May  26,  2020,  of  ACM  Research,  Inc.  (incorporated  herein  by
reference to Exhibit 10.10 to the Current Report on Form 8-K filed on June 1, 2020)

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Table of Contents

10.30‡†

10.31†

10.32†

10.33†

10.34†

10.35†

10.36‡†

10.37‡†

10.38†*

10.38(a)

10.39†

10.40†

10.41‡†

10.42

10.43

16.01

16.02

21.01
23.01
23.02

Statement and Commitment Letter, effective as of May 26, 2020, of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.11 to the Current Report on Form 8-K
filed on June 1, 2020)
Commitment Letter Regarding Property Lease Matters, effective as of May 26, 2020, of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.12 to the Current
Report on Form 8-K filed on June 1, 2020)
Commitment Letter Regarding Social Insurance and Housing Provident Fund Matters, effective as of May 26, 2020, of ACM Research, Inc. (incorporated herein by reference
to Exhibit 10.13 to the Current Report on Form 8-K filed on June 1, 2020)
Commitment  Letter  Regarding  Foreign  Exchange  Matters,  effective  as  of  May  26,  2020,  of  ACM  Research,  Inc.  (incorporated  herein  by  reference  to  Exhibit  10.14  to  the
Current Report on Form 8-K filed on June 1, 2020)
Confirmation and Commitment Letter Regarding the Historical Evolution Related Matters Regarding ACM Research (Shanghai), Inc., effective as of May 26, 2020, of ACM
Research, Inc. (incorporated herein by reference to Exhibit 10.15 to the Current Report on Form 8-K filed on June 1, 2020)
Confirmation Letter, effective as of May 26, 2020, of ACM Research, Inc. (incorporated herein by reference to Exhibit 10.16 to the Current Report on Form 8-K filed on June
1, 2020)
Qingdao Fortune-Tech Xinxing Capital Partnership (L.P.) Partnership Agreement, dated June 9, 2020, among China Fortune Tech Capital Co., Ltd., as general partner, and the
several limited partners named therein, including ACM Research (Shanghai), Inc. (incorporated herein by reference to Exhibit 10.01 to the Current Report on Form 8-K filed
on July 7, 2020)
Supplementary Agreement to Partnership Agreement of Qingdao Fortune-Tech Xinxing Capital Partnership (L.P.), dated June 15, 2020, among China Fortune Tech Capital
Co., Ltd., as general partner, and the several limited partners named therein, including ACM Research (Shanghai), Inc. (incorporated herein by reference to Exhibit 10.02 to the
Current Report on Form 8-K filed on July 7, 2020)
Form of Shanghai Public Rental Housing Overall Pre-Sale Contract (incorporated herein by reference to Exhibit 10.01 to the Current Report on Form 8-K filed on February 25,
2021)
Schedule identifying agreements substantially identical to the form of Shanghai Public Rental Housing Overall Pre-Sale Contract filed as Exhibit 10.43 hereto (incorporated
herein by reference to Exhibit 10.01(a) to the Current Report on Form 8-K filed on February 25, 2021)
Loan and Mortgage Contract dated November 19, 2020 between China Merchants Bank Co., Ltd., Shanghai Pilot Free Trade Zone Lin-Gang Special Area Sub-branch and
Shengwei Research (Shanghai), Inc. (incorporated herein by reference to Exhibit 10.02 to the Current Report on Form 8-K filed on February 25, 2021)
Irrevocable Letter of Guarantee dated November 19, 2020 between China Merchants Bank Co., Ltd., Shanghai Pilot Free Trade Zone Lin-Gang Special Area Sub-branch and
ACM Research (Shanghai), Inc. (incorporated herein by reference to Exhibit 10.03 to the Current Report on Form 8-K filed on February 25, 2021)
Plant  lease  Contract  dated  as  of  February  1,  2021  between  ACM  Research  (Shanghai),  Inc.  and  Shanghai  Shengyu  Culture  Development  Co.,  Ltd.  (incorporated  herein  by
reference to Exhibit 10.01 to the Quarterly Report on Form 10-Q filed on May 7, 2021)
Unofficial  English  Translation  of  RMB  Working  Capital  Loan  Contract  dated  as  of  July  25,  2023,  by  and  between  ACM  Research,  Inc.  and  China  CITIC  Bank  Co.,  Ltd.
Shanghai Bank (incorporated herein by reference to Exhibit 10.01 to the Current Report on Form 8-K filed on July 31, 2023)
Lease  Agreement  dated  March  6,  2023,  by  and  between  Hillsboro  229,  LLC  and  ACM  Research,  Inc.  (incorporated  herein  by  reference  to  Exhibit  10.02  to  the  Quarterly
Report on Form 10-Q filed on August 7, 2023)
Letter from Armanino LLP dated July 27, 2023 to the Securities and Exchange Commission (incorporated herein by reference to Exhibit 16.1 to the Current Report on Form 8-
K filed on July 27, 2023)
Letter from Armanino LLP dated September 26, 2023 to the Securities and Exchange Commission (incorporated herein by reference to Exhibit 16.1 to the Current Report on
Form 8-K filed on September 26, 2023)
List of Subsidiaries of ACM Research, Inc.
Consent of Ernst & Young Hua Ming LLP
Consent of Armanino LLP

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Table of Contents

23.03
31.01

31.02

32.01

97.01
99.01
101.INS
101.SCH
101.CAL
101.DEF
101.LAB
101.PRE
104

+

Consent of BDO China Shu Lun Pan Certified Public Accountants LLP
Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002
Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002
Certification of Principal Executive Officer and Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act
of 2002
ACM Research, Inc. Incentive-Based Compensation Recovery Policy
Submission under Item 9C(a) of Form 10-K
Inline XBRL Instance Document (the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document)
Inline XBRL Taxonomy Extension Schema Document
Inline XBRL Taxonomy Extension Calculation Linkbase Document
Inline XBRL Taxonomy Extension Definition Linkbase Document
Inline XBRL Taxonomy Extension Label Linkbase Document
Inline XBRL Taxonomy Extension Presentation Linkbase Document
Cover Page Interactive Data File (formatted as inline XBRL and contained in exhibit 101)

+    Indicates management contract or compensatory plan.

‡    Certain information in this exhibit was omitted by means of redacting a portion of the text and replacing it with [***]

†
*

Unofficial English translation of original document prepared in Mandarin Chinese.
Certain appendices have been omitted pursuant to Item 601(a)(5) of Regulation S-K. We hereby undertake to furnish copies of the omitted appendices upon request by the Securities and
Exchange Commission, provided that we may request confidential treatment pursuant to Rule 24b‑2 of the Securities Exchange Act of 1934 for the appendices so furnished.

Item 16.    Form 10-K Summary

None.

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Table of Contents

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly

authorized, as of February 28, 2024.

ACM RESEARCH, INC.

By:

/s/ David H. Wang

David H. Wang
Chief Executive Officer and President

Pursuant to the requirements of the Securities Act of 1934, this report has been signed below by the following persons in the capacities indicated as of February 28, 2024:

Signature

/s/ David H. Wang

David H. Wang

/s/ Mark A. McKechnie

Mark A. McKechnie

/s/ Haiping Dun

Haiping Dun

/s/ Chenming Hu

Chenming Hu

/s/ Tracy Liu

Tracy Liu

/s/ Xiao Xing

Xiao Xing

Title

Chief Executive Officer, President and Director
(Principal Executive Officer)

Chief Financial Officer, Executive Vice President and Treasurer
(Principal Financial and Accounting Officer)

Director

Director

Director

Director

136

Description of ACM Research, Inc. Securities

Exhibit 4.05

The following information constitutes the “Description of Securities” required by Item 202(a) of Regulation S-K. As of February 28, 2024, ACM Research, Inc. has one class of securities registered
under Section 12 of the Securities Exchange Act of 1934, as amended, which is its Class A common stock, $0.0001 par value per share.

References herein to “we,” “our,” “us,” or “our company” refer to ACM Research, Inc., a Delaware corporation. The following information summarizes the material terms of our common and
preferred stock and warrants, as well as relevant provisions of our charter, which includes certificates of designations relating to each series of our preferred stock, and bylaws, the Delaware General
Corporation Law and the Warrant (as defined below). For a complete description of the terms of our common stock and other securities, please refer to our charter and bylaws and the Warrant.

Authorized Capital Stock

Our  authorized  capital  stock  consists  of  (i)  150,000,000  shares  of  Class  A  common  stock,  $0.0001  par  value  per  share,  of  which  60,000,000  are  available  only  for  issuance  as  dividends  on
outstanding Class A common stock, (ii) 5,307,816 shares of Class B common stock, $0.0001 par value per share, all of which are available only for issuance as dividends on outstanding Class B
common  stock,  and  (iii)  10,000,000  shares  of  preferred  stock,  $0.0001  par  value  per  share.  Class  A  common  stock  and  Class  B  common  stock  are  referred  to  collectively  as  common  stock.
Authorized but unissued shares of Class B Common Stock are not available for reissuance.

Common Stock

Voting Rights

Except as otherwise required by Delaware law, at every annual or special meeting of stockholders, holders of Class B common stock are entitled to twenty votes per share and holders of Class A
common stock are entitled to one vote per share. The holders of Class A common stock and Class B common stock vote together as a single class, unless otherwise required by law.

Dividends

Subject to preferences that may be applicable to any then outstanding preferred stock, the holders of our outstanding shares of common stock are entitled to receive dividends, if any, as may be
declared from time to time by the board of directors out of legally available funds. The holders of Class A common stock and Class B common stock are entitled to share equally, identically and
ratably, on a per share basis, with respect to any dividend or distribution unless different treatment of the shares of each such class is approved by the affirmative vote of the holders of a majority of
the outstanding shares of Class A common stock and Class B common stock, each voting separately as a class. At present, we have no plans to issue dividends.

Liquidation

In  the  event  of  our  liquidation,  dissolution  or  winding  up,  holders  of  common  stock  will  be  entitled  to  share  ratably  in  the  net  assets  legally  available  for  distribution  to  stockholders  after  the
payment of all of our debts and other liabilities, subject to the satisfaction of any liquidation preference granted to the holders of any outstanding shares of preferred stock.

Conversion

Each outstanding share of Class B common stock is convertible into one share of Class A common stock (a) at any time, at the option of the holder, or (b) upon any transfer of such share of Class B
common stock, whether or not for value, except for certain transfers described in our charter, including transfers to family members, trusts solely for the benefit of the stockholder or their family
members, and partnerships, corporations, and other entities exclusively owned by the stockholder or their family members. Once converted or transferred and converted into Class A common stock,
shares of Class B common stock will not be reissued.

Other Rights and Preferences

Other than as described above, holders of common stock have no preemptive, conversion or subscription rights, and there are no redemption or sinking fund provisions applicable to common stock.
The rights, preferences and privileges of the holders of common stock are subject to, and may be adversely affected by, the rights of the holders of shares of any series of preferred stock that we may
designate and issue in the future.

Preferred Stock

Under the terms of our charter, the board of directors is authorized to issue up to 10,000,000 shares of preferred stock in one or more series, to establish the number of shares to be included in each
such series, and to fix the designation, powers, preferences and rights of such shares and any qualifications, limitations or restrictions thereof. These rights, preferences and privileges could include
dividend rights, conversion rights, voting rights, terms of redemption, liquidation preferences, sinking fund terms and other provisions, any or all of which may be greater than the rights of common
stock. The issuance of preferred stock with voting and conversion rights may adversely affect the voting power of the holders of common stock, including the loss of voting control to others, and the
likelihood that such holders will receive dividend payments and payments upon our liquidation. In addition, the issuance of preferred stock could have the effect of delaying, deferring or preventing
a change in control of our company or other corporate action.

Anti-Takeover Provisions

So long as the outstanding shares of Class B common stock represent a majority of the combined voting power of common stock, the holders of Class B common stock will effectively control all
matters submitted to our stockholders for a vote, as well as the overall management and direction of our company, which will have the effect of delaying, deferring or discouraging another person
from acquiring control of our company.

After such time as the shares of Class B common stock no longer represent a majority of the combined voting power of common stock, the provisions of Delaware law, and our charter and our
bylaws may have the effect of delaying, deferring or discouraging another person from acquiring control of our company.

Delaware Law

Section 203 of the Delaware General Corporation Law prevents some Delaware corporations from engaging, under some circumstances, in a business combination, which includes a merger or sale
of at least 10% of the corporation’s assets with any interested stockholder, meaning a stockholder who, together with affiliates and associates, owns or, within three years prior to the determination
of interested stockholder status, did own 15% or more of the corporation’s outstanding voting stock, unless:

•

•

•

the transaction is approved by the board of directors prior to the time that the interested stockholder became an interested stockholder;

upon consummation of the transaction, which resulted in the stockholder’s becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of
the corporation outstanding at the time the transaction commenced, excluding stock owned by directors who are also officers of the corporation; or

subsequent to such time that the stockholder became an interested stockholder the business combination is approved by the board and authorized at an annual or special meeting of
stockholders by at least two-thirds of the outstanding voting stock that is not owned by the interested stockholder.

A Delaware corporation may “opt out” of these provisions with an express provision in its original charter or an express provision in its charter or bylaws resulting from a stockholders’ amendment
approved  by  at  least  a  majority  of  the  outstanding  voting  shares.  We  have  not  opted  out  of  these  provisions.  As  a  result,  mergers  or  other  takeover  or  change  in  control  attempts  of  us  may  be
discouraged or prevented.

Charter and Bylaw Provisions

Our charter and bylaws include a number of provisions that may have the effect of deterring hostile takeovers or delaying or preventing changes in control of our company, even after such time as
the shares of Class B common stock no longer represent a majority of the combined voting power of common stock, including the following:

•

•

•

•

•

•

Separate Class B Vote for Certain Transactions. Until the first date on which the outstanding shares of Class B common stock represent less than 35% of the combined voting power
of common stock, any transaction that would result in a change in control of our company will require the approval of a majority of our outstanding Class B common stock voting as
a separate class. This provision could delay or prevent the approval of a change in control that might otherwise be approved by a majority of outstanding shares of Class A and Class
B common stock, voting together on a combined basis.

Dual Class Stock. As described above in “-Common Stock-Voting Rights” above, our charter provides for a dual class common stock structure, which provides certain members of
our senior management with the ability to control the outcome of matters requiring stockholder approval, even if they collectively own significantly less than a majority of the shares
of our outstanding Class A and Class B common stock, including the election of directors and significant corporate transactions, such as a merger or other sale of our company or its
assets.

Supermajority Approvals. Our charter and bylaws provide that when the outstanding shares of Class B common stock represent less than a majority of the combined voting power of
common stock, certain amendments to our charter or bylaws will require the approval of two-thirds of the combined vote of our then-outstanding shares of Class A and Class B
common stock. This will have the effect of making it more difficult to amend our charter or bylaws to remove or modify certain provisions.

Board of Directors Vacancies. Our charter and bylaws provide that stockholders may fill vacant directorships. When the outstanding shares of Class B common stock represent less
than a majority of the combined voting power of common stock, our charter and bylaws authorize only the board of directors to fill vacant directorships. In addition, the number of
directors constituting the board is set only by resolution adopted by a majority vote of our entire board. These provisions restricting the filling of vacancies will prevent a stockholder
from increasing the size of the board and gaining control of the board by filling the resulting vacancies with its own nominees. Our charter provides that directors may be removed
with or without cause only by the affirmative vote of the holders of at least two-thirds of the votes that all of the stockholders would be entitled to cast in any annual election of
directors.

Classified Board. The board of directors is not currently classified. Our charter and bylaws provide that when outstanding shares of Class B common stock represent less than a
majority of the combined voting power of common stock, the board will be classified into three classes of directors, each of which will hold office for a three-year term. In addition,
thereafter,  directors  may  be  removed  from  the  board  with  or  without  cause  only  by  the  affirmative  vote  of  the  holders  of  at  least  two-thirds  of  the  voting  power  of  the  then-
outstanding shares of Class A and Class B common stock. The existence of a classified board could delay a successful tender offeror from obtaining majority control of the board,
and the prospect of that delay might deter a potential offeror.

Stockholder Action; Special Meeting of Stockholders. Our charter provides that stockholders will be able to take action by written consent. When the outstanding shares of Class B
common stock represent less than a majority of the combined voting power of common stock, our stockholders will no longer be able to take action by written consent, and will only
be  able  to  take  action  at  annual  or  special  meetings  of  our  stockholders.  Stockholders  will  not  be  permitted  to  cumulate  their  votes  for  the  election  of  directors.  The  absence  of
cumulative voting may make it more difficult for stockholders who own less than a majority in voting power to elect any directors to the board of directors. Our bylaws further
provide that special meetings of our stockholders may be called only by the board, the chair of the board or our chief executive officer. A stockholder may not call a special meeting,
which may delay the ability of our stockholders to force consideration of a proposal or for holders controlling a majority in voting power of our capital stock to take any action,
including the removal of director.

•

•

Advance Notice Requirements for Stockholder Proposals and Director Nominations. Our bylaws provide advance notice procedures for stockholders seeking to bring business before
our annual meeting of stockholders, or to nominate candidates for election as directors at any meeting of stockholders. Our bylaws also specify certain requirements regarding the
form  and  content  of  a  stockholder’s  notice.  These  provisions  may  preclude  our  stockholders  from  bringing  matters  before  our  annual  meeting  of  stockholders  or  from  making
nominations for directors at our meetings of stockholders.

Issuance of Undesignated Preferred Stock. The board of directors has the authority, without further action by the stockholders, to issue shares of undesignated preferred stock with
rights and preferences, including voting rights, designated from time to time by the board. The existence of authorized but unissued shares of preferred stock enables the board to
render more difficult or to discourage an attempt to obtain control of us by means of a merger, tender offer, proxy contest or otherwise.

Choice of Forum

Our charter provides that the Court of Chancery of the State of Delaware will be the exclusive forum for: any derivative action or proceeding brought on our behalf; any action asserting a breach of
fiduciary duty; any action asserting a claim against us arising pursuant to the Delaware General Corporation Law, or our charter or bylaws; any action to interpret, apply, enforce, or determine the
validity  of  our  charter  or  bylaws;  or  any  action  asserting  a  claim  against  us  that  is  governed  by  the  internal  affairs  doctrine.  The  enforceability  of  similar  choice  of  forum  provisions  in  other
companies’ certificates of incorporation has been challenged in legal proceedings, and it is possible that a court could find these types of provisions to be inapplicable or unenforceable. The choice
of forum provision summarized above is not intended to, and would not, apply to suits brought to enforce any liability or duty created by (i) the Securities Act of 1933 or the rules and regulations
thereunder, jurisdiction over which is vested in concurrently vested in federal and state courts, or (ii) the Securities Exchange Act of 1934 or the rules and regulations thereunder, jurisdiction over
which is exclusively vested by statute in the U.S. federal courts.

Transfer Agent and Registrar

The transfer agent and registrar for our common stock is Computershare Trust Company, N.A.

Nasdaq Global Market

The Class A common stock is listed on the Nasdaq Global Market under the symbol “ACMR.”

 
ACM RESEARCH, INC.
LIST OF SUBSIDIARIES

Exhibit 21.01

Name of Subsidiary
ACM Research (Shanghai), Inc.
CleanChip Technologies Limited
ACM Research (Wuxi), Inc.
ACM Research Korea CO., LTD.
Shengwei Research (Shanghai), Inc. (1)
ACM Research (Singapore) PTE, Ltd.
ACM Research (CA), Inc.
ACM Research (Cayman), Inc.
ACM Research (Beijing), Inc.
Hanguk ACM CO., LTD
Yusheng Micro Semiconductor (Shanghai), Co., Ltd.
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.

Jurisdiction of Incorporation or Organization
People’s Republic of China
Hong Kong
People’s Republic of China
Republic of Korea
People’s Republic of China
Singapore
United States of America
Cayman Islands
People’s Republic of China
Korea
People’s Republic of China
People’s Republic of China

(1) ACM Research (Lingang) Inc. is the English name referred to by its Chinese language name Shengwei Research (Shanghai), Inc. ACM Research (Lingang), Inc. and Shengwei Research
(Shanghai), Inc. refer to the same entity.

We consent to the incorporation by reference in the following Registration Statements:

Consent of Independent Registered Public Accounting Firm

(1) Registration Statement (Form S-8 No. 333-222702) pertaining to 1998 Stock Option Plan and 2016 Omnibus Incentive Plan of ACM Research, Inc.;

(2) Registration Statement (Form S-8 No. 333-232780) pertaining to 2016 Omnibus Incentive Plan of ACM Research, Inc.;

(3) Registration Statement (Form S-8 No. 333-254150) pertaining to 2016 Omnibus Incentive Plan of ACM Research, Inc.; and

(4) Registration Statement (Form S-8 No. 333-271931) pertaining to 2016 Omnibus Incentive Plan of ACM Research, Inc.

of  our  reports  dated  February  28,  2024,  with  respect  to  the  consolidated  financial  statements  of  ACM  Research,  Inc.  and  the  effectiveness  of  internal  control  over  financial
reporting of ACM Research, Inc. included in this Annual Report (Form 10-K) of ACM Research, Inc. for the year ended December 31, 2023.

/s/ Ernst & Young Hua Ming LLP
Shanghai, the People’s Republic of China
February 28, 2024

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S-8 (Nos. 333-271931, 333-254150, 333-232780 and 333-222702) of our report dated
March 1, 2023, relating to the consolidated financial statements, of ACM Research, Inc. and subsidiaries (the “Company”), appearing in this Annual Report on Form 10-K of ACM
Research, Inc. and subsidiaries for the year ended December 31, 2023.

/s/ Armanino
San Ramon, California

LLP

February 28, 2024

    
    
Consent of Independent Registered Public Accounting Firm

ACM Research, Inc.
42307 Osgood Road, Suite I
Fremont, California 94539
United States

We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (No. 333-222702, 333-232780, 333-254150 and 333-271931) of ACM Research, Inc. of our report
dated March 1, 2022 except for the effects of the common stock split discussed in Notes 1 and 2 to the consolidated financial statements, as to which the date is March 1, 2023, relating to the
consolidated financial statements, which appear in this Form 10-K.

/s/BDO China Shu Lun Pan Certified Public Accountants LLP
Shenzhen, The People’s Republic of China

February 28, 2024

Exhibit 31.01
CERTIFICATION OF PRINCIPAL EXECUTIVE OFFICER
PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, David H. Wang, certify that:

1.

I have reviewed this Annual Report on Form 10-K of ACM Research, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances

under which such statements were made, not misleading with respect to the period covered by this annual report.

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and

cash flows of the registrant as of, and for, the periods presented in this report.

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))

and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)), for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the

registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding

the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as

of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter

in the case of this annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee

of the registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to

record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 28, 2024

/s/ David H. Wang

David H. Wang
Chief Executive Officer and President
(Principal Executive Officer)

Exhibit 31.02
CERTIFICATION OF PRINCIPAL FINANCIAL OFFICER
PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Mark A. McKechnie, certify that:

1.

I have reviewed this annual report on Form 10-K of ACM Research, Inc.

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances

under which such statements were made, not misleading with respect to the period covered by this annual report.

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and

cash flows of the registrant as of, and for, the periods presented in this report.

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e))

and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)), for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the

registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding

the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as

of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter

in the case of this annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting.

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee

of registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to

record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 28, 2024

/s/ Mark A. McKechnie

Mark A. McKechnie
Chief Financial Officer, Executive Vice President and Treasurer
(Principal Financial Officer)

Exhibit 32.01
CERTIFICATION PURSUANT TO 18 U.S.C. 1350,
AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report on Form 10-K of ACM Research, Inc. for the year ended December 31, 2023, as filed with the Securities and Exchange Commission on the date hereof (the
“Report”), each of the undersigned certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his or her knowledge on the date
hereof:

1.

the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2.

the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of ACM Research, Inc. for the period presented therein.

Date: February 28, 2024

/s/ David H. Wang

David H. Wang
Chief Executive Officer and President
(Principal Executive Officer)

Date: February 28, 2024

/s/ Mark A. McKechnie

Mark A. McKechnie
Chief Financial Officer, Executive Vice President and Treasurer
(Principal Financial Officer)

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350 and is not being filed as part of the Report or as a separate disclosure document.

ACM RESEARCH, INC.

INCENTIVE-BASED COMPENSATION RECOVERY POLICY

1. Policy Purpose. The purpose of this ACM Research, Inc. (the “Company”) Incentive-Based Compensation Recovery Policy (this “Policy”) is to enable the Company to recover
Erroneously Awarded Compensation in the event that the Company is required to prepare an Accounting Restatement. This Policy is intended to comply with the requirements
set forth in Listing Rule 5608 of the corporate governance rules of The NASDAQ Stock Market (the “Listing Rule”) and shall be construed and interpreted in accordance with
such  intent.  Unless  otherwise  defined  in  this  Policy,  capitalized  terms  shall  have  the  meaning  ascribed  to  such  terms  in  Section  7.  This  Policy  shall  become  effective  on
December  1,  2023.  Where  the  context  requires,  reference  to  the  Company  shall  include  the  Company’s  subsidiaries  and  affiliates  (as  determined  by  the  Committee  in  its
discretion).

2. Policy Administration.  This  Policy  shall  be  administered  by  the  Compensation  Committee  of  the  Board  (the  “Committee”)  unless  the  Board  determines  to  administer  this
Policy itself. The Committee has full and final authority to make all determinations under this Policy. All determinations and decisions made by the Committee pursuant to the
provisions of this Policy shall be final, conclusive and binding on all persons, including the Company, its affiliates, its stockholders and Executive Officers. Any action or
inaction by the Committee with respect to an Executive Officer under this Policy in no way limits the Committee’s actions or decisions not to act with respect to any other
Executive Officer under this Policy or under any similar policy, agreement or arrangement, nor shall any such action or inaction serve as a waiver of any rights the Company
may have against any Executive Officer other than as set forth in this Policy.

3. Policy Application.  This  Policy  applies  to  all  Incentive-Based  Compensation  received  by  a  person:  (a)  on  or  after  October  2,  2023,  and  beginning  service  as  an  Executive
Officer; (b) who served as an Executive Officer at any time during the performance period for such Incentive-Based Compensation; (c) while the Company had a class of
securities listed on a national securities exchange or a national securities association; and (d) during the three completed fiscal years immediately preceding the Accounting
Restatement Date. In addition to such last three completed fiscal years, the immediately preceding clause (d) includes any transition period that results from a change in the
Company’s fiscal year within or immediately following such three completed fiscal years; provided, however, that a transition period between the last day of the Company’s
previous fiscal year end and the first day of its new fiscal year that comprises a period of nine to twelve months shall be deemed a completed fiscal year. For purposes of this
Section 3, Incentive-Based Compensation is deemed received in the Company’s fiscal period during which the Financial Reporting Measure specified in the Incentive-Based
Compensation award is attained, even if the payment or grant of the Incentive-Based Compensation occurs after the end of that period. For the avoidance of doubt, Incentive-
Based  Compensation  that  is  subject  to  both  a  Financial  Reporting  Measure  vesting  condition  and  a  service-based  vesting  condition  shall  be  considered  received  when  the
relevant Financial Reporting Measure is achieved, even if the Incentive-Based Compensation continues to be subject to the service-based vesting condition.

4. Policy Recovery Requirement. In the event of an Accounting Restatement, the Company must recover, reasonably promptly, Erroneously Awarded Compensation, in amounts
determined  pursuant  to  this  Policy.  The  Company’s  obligation  to  recover  Erroneously  Awarded  Compensation  is  not  dependent  on  if  or  when  the  Company  files  restated
financial  statements.  Recovery  under  this  Policy  with  respect  to  an  Executive  Officer  shall  not  require  the  finding  of  any  misconduct  by  such  Executive  Officer  or  such
Executive  Officer  being  found  responsible  for  the  accounting  error  leading  to  an  Accounting  Restatement.  In  the  event  of  an  Accounting  Restatement,  the  Company  shall
satisfy the Company’s obligations under this Policy to recover any amount owed from any applicable Executive Officer by exercising its sole and absolute discretion in how to
accomplish such recovery. The Company’s recovery obligation pursuant to this Section 4 shall not apply to the extent that the Committee, or in the absence of the Committee, a
majority of the independent directors serving on the Board, determines that such recovery would be impracticable and:

a. The  direct  expense  paid  to  a  third  party  to  assist  in  enforcing  this  Policy  would  exceed  the  amount  to  be  recovered.  Before  concluding  that  it  would  be

impracticable to recover any amount of Erroneously Awarded Compensation based on expense of enforcement, the

507172572.2

 
Company must make a reasonable attempt to recover such Erroneously Awarded Compensation, document such reasonable attempt(s) to recover, and provide that
documentation to the Stock Exchange; or

b. Recovery would likely cause an otherwise tax-qualified retirement plan, under which benefits are broadly available to employees of the registrant, to fail to meet

the requirements of Section 401(a)(13) or Section 411(a) of the Code.

5. Policy  Prohibition  on  Indemnification  and  Insurance  Reimbursement.  The  Company  is  prohibited  from  indemnifying  any  Executive  Officer  or  former  Executive  Officer
against the loss of Erroneously Awarded Compensation. Further, the Company is prohibited from paying or reimbursing an Executive Officer for purchasing insurance to cover
any such loss.

6. Required Policy-Related Filings. The Company shall file all disclosures with respect to this Policy in accordance with the requirements of the Federal securities laws, including

disclosures required by U.S. Securities and Exchange Commission filings.

7. Definitions.

a. “Accounting Restatement” means an accounting restatement due to the material noncompliance of the Company with any financial reporting requirement under the
securities laws, including any required accounting restatement to correct an error in previously issued financial statements that is material to the previously issued
financial statements, or that would result in a material misstatement if the error were corrected in the current period or left uncorrected in the current period.

b. “Accounting Restatement Date” means the earlier to occur of: (i) the date the Board, a committee of the Board, or the officer or officers of the Company authorized
to take such action if the Board action is not required, concludes, or reasonably should have concluded, that the Company is required to prepare an Accounting
Restatement; and (ii) the date a court, regulator, or other legally authorized body directs the Company to prepare an Accounting Restatement.

c. “Board” means the board of directors of the Company.

d. “Code”  means  the  U.S.  Internal  Revenue  Code  of  1986,  as  amended.  Any  reference  to  a  section  of  the  Code  or  regulation  thereunder  includes  such  section  or
regulation, any valid regulation or other official guidance promulgated under such section, and any comparable provision of any future legislation or regulation
amending, supplementing, or superseding such section or regulation.

e. “Erroneously Awarded Compensation” means, in the event of an Accounting Restatement, the amount of Incentive-Based Compensation previously received that
exceeds  the  amount  of  Incentive-Based  Compensation  that  otherwise  would  have  been  received  had  it  been  determined  based  on  the  restated  amounts  in  such
Accounting  Restatement,  and  must  be  computed  without  regard  to  any  taxes  incurred  or  paid  by  the  relevant  Executive  Officer;  provided,  however,  that  for
Incentive-Based  Compensation  based  on  stock  price  or  total  stockholder  return,  where  the  amount  of  Erroneously  Awarded  Compensation  is  not  subject  to
mathematical recalculation directly from the information in an Accounting Restatement: (i) the amount of Erroneously Awarded Compensation must be based on a
reasonable estimate of the effect of the Accounting Restatement on the stock price or total stockholder return upon which the Incentive-Based Compensation was
received;  and  (ii)  the  Company  must  maintain  documentation  of  the  determination  of  that  reasonable  estimate  and  provide  such  documentation  to  the  Stock
Exchange.

f.

“Executive  Officer”  means  the  Company’s  president,  principal  financial  officer,  principal  accounting  officer  (or  if  there  is  no  such  accounting  officer,  the
controller), any vice-president of the Company in charge of a principal business unit, division, or function (such as sales, administration, or finance), any other
officer who performs a policy-making

507172572.2

2

 
function,  or  any  other  person  who  performs  similar  policy-making  functions  for  the  Company.  An  executive  officer  of  the  Company’s  parent  or  subsidiary  is
deemed an “Executive Officer” if the executive officer performs such policy making functions for the Company. For the avoidance of doubt, “Executive Officer”
includes, but is not limited to, any person identified as an executive officer pursuant to Item 401(b) of Regulation S-K under the U.S. Securities Act of 1933, as
amended.

g. “Financial Reporting Measure” means any measure that is determined and presented in accordance with the accounting principles used in preparing the Company’s
financial statements, and any measure that is derived wholly or in part from such measure; provided, however, that a Financial Reporting Measure is not required
to be presented within the Company’s financial statements or included in a filing with the U.S. Securities and Exchange Commission to qualify as a “Financial
Reporting Measure.” For purposes of this Policy, “Financial Reporting Measure” includes, but is not limited to, stock price and total stockholder return.

h. “Incentive-Based Compensation” means any compensation that is granted, earned, or vested based wholly or in part upon the attainment of a Financial Reporting

Measure.

i.

“Stock Exchange” means the national stock exchange on which the Company’s common stock is listed.

8. Acknowledgement. Each Executive Officer shall sign and return to the Company, within 30 calendar days following the later of (i) the effective date of this Policy first set
forth above or (ii) the date the individual becomes an Executive Officer, the Acknowledgement Form attached hereto as Exhibit A, pursuant to which the Executive Officer
agrees to be bound by, and to comply with, the terms and conditions of this Policy.

9. Committee Indemnification. Any members of the Committee, and any other members of the Board who assist in the administration of this Policy, shall not be
personally liable for any action, determination or interpretation made with respect to this Policy and shall be fully indemnified by the Company to the fullest
extent under applicable law and Company policy with respect to any such action, determination or interpretation. The foregoing sentence shall not limit any
other rights to indemnification of the members of the Board under applicable law or Company policy.

10. Severability. The provisions in this Policy are intended to be applied to the fullest extent of the law. To the extent that any provision of this Policy is found to be unenforceable
or invalid under any applicable law, such provision shall be applied to the maximum extent permitted, and shall automatically be deemed amended in a manner consistent with
its objectives to the extent necessary to conform to any limitations required under applicable law.

11. Amendment; Termination. The Board may amend this Policy from time to time in its sole and absolute discretion and shall amend this Policy as it deems necessary to reflect

the Listing Rule. The Board may terminate this Policy at any time.

12. Other Recovery Obligations; General Rights. To the extent that the application of this Policy would provide for recovery of Incentive-Based Compensation that the Company
recovers pursuant to Section 304 of the Sarbanes-Oxley Act or other recovery obligations, the amount the relevant Executive Officer has already reimbursed the Company will
be credited to the required recovery under this Policy. This Policy shall not limit the rights of the Company to take any other actions or pursue other remedies that the Company
may  deem  appropriate  under  the  circumstances  and  under  applicable  law.  To  the  maximum  extent  permitted  under  the  Listing  Rule,  this  Policy  shall  be  administered  in
compliance with (or pursuant to an exemption from the application of) Section 409A of the Code.

13. Successors. This Policy is binding and enforceable against all Executive Officers and their beneficiaries, heirs, executors, administrators or other legal representatives.

507172572.2

3

 
14. Governing Law; Venue. This Policy and all rights and obligations hereunder are governed by and construed in accordance with the internal laws of the State of Delaware,
excluding any choice of law rules or principles that may direct the application of the laws of another jurisdiction. All actions arising out of or relating to this Policy shall be
heard and determined exclusively in the Court of Chancery of the State of Delaware or, if such court declines to exercise jurisdiction or if subject matter jurisdiction over the
matter that is the subject of any such legal action or proceeding is vested exclusively in the U.S. Federal courts, the U.S. District Court for the District of Delaware.

507172572.2

4

 
EXHIBIT A

ACM RESEARCH, INC.
INCENTIVE-BASED COMPENSATION RECOVERY POLICY

ACKNOWLEDGEMENT FORM

By signing below, the undersigned acknowledges and confirms that the undersigned has received and reviewed a copy of the ACM Research, Inc. (the “Company”) Incentive-
Based Compensation Recovery Policy (the “Policy”).

By signing this Acknowledgement Form, the undersigned acknowledges and agrees that the undersigned is and will continue to be subject to the Policy and that the Policy will
apply both during and after the undersigned’s employment with the Company. Further, by signing below, the undersigned agrees to abide by the terms of the Policy, including,
without limitation, by returning any Erroneously Awarded Compensation (as defined in the Policy) to the Company to the extent required by, and in a manner consistent with, the
Policy.  Further,  by  signing  below,  the  undersigned  agrees  that  the  terms  of  the  Policy  shall  govern  in  the  event  of  any  inconsistency  between  the  Policy  and  the  terms  of  any
employment  agreement  to  which  the  undersigned  is  a  party,  or  the  terms  of  any  compensation  plan,  program  or  agreement  under  which  any  compensation  has  been  granted,
awarded, earned or paid.

EXECUTIVE OFFICER

Signature

Print Name

Date

507172572.2

A-1

 
ACM Research, Inc.
42307 Osgood Road, Suite I
Fremont, California 94539

Exhibit 99.01

ry 28, 2024

GAR

Securities and Exchange Commission
Division of Corporate Finance
100 F. Street, N.E.
Washington, DC 20549

Re:

ACM Research, Inc.

Submission under Item 9C(a) of Form 10-K

Ladies and Gentlemen:

ACM Research, Inc. (the “Company”) is submitting the following information pursuant to Item 9C(a) of Form 10-K.

The Company was identified by the Securities and Exchange Commission pursuant to Section 104(i)(2)(A) of the Sarbanes-Oxley Act of 2002 (15 U.S.C. 7214(i)(2)(A)) as having retained, for
the preparation of the audit report on its financial statements included in its Annual Report on Form 10-K for the year ended December 31, 2021, a registered public accounting firm that has a
branch  or  office  that  is  located  in  a  foreign  jurisdiction  and  that  the  Public  Company  Accounting  Oversight  Board  (the  “PCAOB”)  had  then  determined  it  was  unable  to  inspect  or  investigate
completely because of a position taken by an authority in the foreign jurisdiction, which determination was vacated by the PCAOB on December 15, 2022.

To the Company’s best knowledge, and based on examination of the Company’s stockholder register and public filings made by its stockholders, particularly the Schedule 13G and Schedule
13G/As filed in January and February 2024, the Company herein confirms that it is not owned or controlled by any governmental entity in such foreign jurisdiction as of the date of this submission.
In addition, the Company is not aware of any governmental entity that is in possession, directly or indirectly, of the power to direct or cause the direction of the management and policies of the
Company, whether through the ownership of voting securities, by contract, or otherwise.

The Company believes it has identified and reviewed the appropriate documents in response to the requirement under paragraph (a) of Item 9C in the Form 10-K. Based on its organizational
structure  and  other  registrant-specific  factors,  the  appropriate  documents  include  its  stockholder  register  and  certain  public  filings  made  by  its  stockholders,  particularly  the  Schedule  13G  and
Schedule 13G/As filed in January and February 2024.

The Company did not rely on any legal opinions or third-party certifications, such as affidavits, as the basis for this submission, as the Company did not consider such third-party materials to be
required or necessary to support the conclusion as stated. The Company considered “the terms “owned or controlled,” “owned,” and “controlling financial interest” used in the Holding Foreign
Companies Accountable Act are reasonably read to have the same meaning as the term “control” as used in the Exchange Act and the Exchange Act rules”, as set forth in the Holding Foreign
Companies Accountable Act Disclosure, Release No. 34-9370.

Please  do  not  hesitate  to  contact  the  Company’s  legal  counsel,  Michael  A.  Hedge  of  K&L  Gates  LLP,  at  (949)  623-3519  if  you  have  any  questions  or  would  like  additional  information

regarding this matter.

* * *

Very truly yours,

/s/ Mark McKechnie

Mark McKechnie

cc:

David H. Wang, ACM Research, Inc.

Michael A. Hedge, K&L Gates LLP
Jason C. Dreibelbis, K&L Gates LLP