0001628280-26-032842 | 10-Q | XBRL Viewer

Print Document

COMMITMENTS AND CONTINGENCIES (Details) $ in Thousands, ¥ in Millions	3 Months Ended
	Mar. 31, 2026 USD ($) legalProceeding	Mar. 31, 2026 CNY (¥)
Commitments and Contingencies Disclosure [Abstract]
Contractual obligation \| $	$ 1,075
Land use rights period	9 years	9 years
Annual total taxes, percentage	80.00%
Annual total taxes	$ 22,800	¥ 157.6
Number of outstanding legal proceedings \| legalProceeding	0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - Customer Concentration Risk	3 Months Ended		12 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Revenue Benchmark \| Three Customers
Concentration of Credit Risk [Abstract]
Concentration risk, percentage	45.90%
Revenue Benchmark \| Four Customers
Concentration of Credit Risk [Abstract]
Concentration risk, percentage		53.60%
Accounts Receivable \| Four Customers
Concentration of Credit Risk [Abstract]
Concentration risk, percentage	60.10%		62.20%

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References + Details

REVENUE FROM CONTRACTS WITH CUSTOMERS

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

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:


	Three Months Ended March 31,
	2026		2025
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment	$	122,482	$	129,569
ECP (front-end and packaging), Furnace and Other Technologies	84,239		27,630
Advanced Packaging (excluding ECP), Services & Spares	24,542		15,148
Total revenue	$	231,263	$	172,347

As of March 31, 2026 and December 31, 2025, substantially all revenue was derived from customers in mainland China, and therefore, no geographical segment information is presented.

Below are the contract liabilities balances as of:


	March 31, 2026		December 31, 2025
Advances from customers	$	168,825	$	187,809
Deferred revenue	10,954		17,388
Total contract liabilities	$	179,779	$	205,197

During the three months ended March 31, 2026, advances from customers decreased by $18,984 primarily due to revenue recognized upon acceptance of first tools by customers, partly offset by an increase of pre-payments made by customers in advance of delivery.

Below are revenues recognized from amounts included in contract liabilities at the beginning of the year.


	Three Months Ended March 31,
	2026		2025
Revenue recognized from amounts included in contract liabilities at the beginning of the periods	$	86,078	$	62,119

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-10

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-15

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-12

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org/606/tableOfContent

+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation and Principles of Consolidation

The Company’s condensed consolidated financial statements include the accounts of ACM and its subsidiaries. ACM’s subsidiaries are those entities in which ACM, directly or indirectly, controls a majority of the voting power. All significant intercompany transactions and balances have been eliminated upon consolidation.

The accompanying condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting on Form 10-Q. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. The accompanying condensed consolidated financial statements should be read in conjunction with the historical consolidated financial statements of the Company for the year ended December 31, 2025 included in ACM’s 2025 Annual Report on Form 10-K.

The accompanying condensed consolidated financial statements are unaudited. In the opinion of management, these unaudited condensed consolidated financial statements of the Company reflect all adjustments that are necessary for a fair presentation of the Company’s financial position and results of operations. Such adjustments are of a normal recurring nature, unless otherwise noted. The balance sheet as of March 31, 2026 and the results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for any future period.

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, stock-based compensation arrangements, uncertain tax positions, warranty liabilities, allowance for credit losses and inventory provision.

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

Cash and Cash Equivalents

Cash and cash equivalents consist of cash on hand, 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 March 31, 2026, and December 31, 2025:


	March 31, 2026		December 31, 2025
United States	$	111,269	$	107,184
Mainland China	310,700		228,777
China Hong Kong	447,027		421,104
Korea	2,006		241
Singapore	1,267		67
Total	$	872,269	$	757,373

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

Cash amounts held 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 restrictions and limitations on its ability to transfer funds to ACM or among our other subsidiaries. However, cash held 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 three months ended March 31, 2026 and 2025, cash payments from ACM Shanghai to ACM California for the procurement of goods and services was $3,258 and $2,674, 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 in accordance with applicable transfer pricing arrangements in the ordinary course of business. ACM Research provides support for tools under warranty to certain customers located in the U.S., Europe and other regions outside of mainland China on behalf of ACM Shanghai. For these transactions, ACM Shanghai makes cash payments to ACM Research in accordance with applicable transfer pricing arrangements.

Cash held in Hong Kong exceeds the Hong Kong Deposit Insurance Corporation insurance limits and is subject to risk of loss. No losses have been experienced to date. There are no additional restrictions for the transfer of cash from bank accounts in the U.S., South Korea, Singapore and Hong Kong.

For the three months ended March 31, 2026 and 2025, with the exception of sales and services-related transfer-pricing payments in the ordinary course of business, 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.

Time Deposits

Time deposits are denominated in Chinese Renminbi (“RMB”) and U.S. dollars and 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 condensed 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 held as of March 31, 2026 had interest rates of 1.2% to 3.75% and mature between April and December 2026.

Restricted Cash

As of March 31, 2026, all of the Company's restricted cash was held by financial institutions located in mainland China, Hong Kong and South Korea, and mainly represents cash secured to guarantee delivery of tools.

Financial Instruments

The Company periodically invests in equity and debt 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 classifies 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. For equity investments that have a readily determinable fair value, the Company classifies 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 recorded in non-operating income or loss in the condensed consolidated statements of comprehensive income.

The Company’s investments in debt securities have been classified as available-for-sale securities. The Company classifies its debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. Unrealized gains and losses on debt securities classified as available-for-sale are recognized in accumulated other comprehensive income in the condensed consolidated balance sheets.

Fair Value Measurement

The Company’s fair value measurements and hierarchy are consistent with those disclosed in the Company’s Annual Report on Form 10‑K for the year ended December 31, 2025.

The Company’s financial instruments primarily include its cash, cash equivalents, restricted cash, and short term time deposits, short-term and long-term investments, other receivables, accounts receivable, 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 receivables, accounts payable, and short-term borrowings approximate their respective 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 Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of March 31, 2026:
Assets
Cash and cash equivalents	$	83,385	$	—	$	—	$	83,385
Short-term investments	34,662		—		—		34,662
Available-for-sale debt securities	—		—		9,853		9,853
	$	118,047	$	—	$	9,853	$	127,900

As of December 31, 2025:
Assets
Cash and cash equivalents	$	84,627	$	—	$	—	$	84,627
Short-term investments	35,524		—		—		35,524
Available-for-sale debt securities	—		—		9,703		9,703
	$	120,151	$	—	$	9,703	$	129,854

The Company did not have any assets and liabilities measured at fair value on a non-recurring basis as of March 31, 2026 and 2025. Refer to note 9 for fair value information related to the Company’s outstanding long-term borrowings as of March 31, 2026 and December 31, 2025.

Basic and Diluted Net Income per Share of Common Stock

Basic and diluted net income per share of common stock are calculated as follows:


	Three Months Ended March 31,
	2026		2025
Numerator:
Net income	$	26,235	$	25,013
Less: Net income attributable to non-controlling interests	8,928		4,633
Net income available to common stockholders, basic	17,307		20,380
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	302		312
Net income available to common stockholders, diluted	$	17,005	$	20,068

Weighted average shares outstanding, basic	65,804,254		63,267,834
Effect of dilutive securities	3,965,653		3,684,940
Weighted average shares outstanding, diluted	69,769,907		66,952,774

Net income per share of common stock:
Basic	$	0.26	$	0.32
Diluted	$	0.24	$	0.30

ACM Research is authorized to issue Class A and Class B common stock. The two classes of common stock are substantially identical in all material respects, except for voting rights. 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 condensed consolidated statements of comprehensive income and in the above computation of net income per share of common stock. ACM did not have any participating securities outstanding during the three months ended March 31, 2026 and 2025.

Diluted net income per share of common stock reflects the potential dilution from securities, such as stock options that could share in ACM Research’s earnings. Certain potentially 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 the calculation of diluted net income per share in the periods presented where their inclusion would be anti-dilutive were 809 and 1,298,408 stock options for the three months ended March 31, 2026 and 2025, respectively.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to credit risk consist principally of cash and cash equivalents, restricted cash, 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 revenue and accounts receivable.

•Revenue concentration. For the three months ended March 31, 2026 and 2025, three customers accounted for 45.9% and four customers accounted for 53.6% of revenue, respectively.

•Accounts receivable concentration. As of March 31, 2026 and December 31, 2025, four customers accounted for 60.1% and four customers accounted for 62.2%, 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.

Recently Adopted Accounting Pronouncements

In July 2025, the FASB issued Accounting Standards Update No. 2025-05 “Financial Instruments—Credit Losses (Topic 326)” or ASU 2025-05. The amendments in ASU 2025-05 permit entities to elect a practical expedient when estimating expected credit losses on accounts receivable and contract assets. Under this election, entities may assume that current conditions as of the balance sheet date do not change for the remaining life of accounts receivable and contract assets when developing forecasts as part of estimating expected credit losses. The Company adopted ASU 2025-05 effective January 1, 2026. The adoption did not have a material effect on the Company’s consolidated financial statements.

Recently issued accounting pronouncements not yet adopted

In December 2024, the FASB issued ASU 2024-03: Income Statement--Reporting Comprehensive Income--Expense Disaggregation Disclosures (Subtopic 220-40), which requires additional disclosures about specific types of expenses included in the expense captions presented on the face of the income statement as well as disclosures about selling expenses. In January 2025, the FASB issued ASU 2025-01, which clarifies the effective date of ASU 2024-03. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. This ASU should be applied prospectively with the option to apply the standard retrospectively. The Company is currently evaluating the provisions of this ASU.

In December 2025, the FASB issued ASU 2025-10 – Government Grants which establishes guidance on the recognition, measurement, and presentation of government grants received by business entities. The new guidance leverages the principles in the accounting framework for government assistance in International Accounting Standard 20 "Accounting for Government Grants and Disclosure of Government Assistance". This ASU is effective for interim reporting periods within annual reporting periods beginning after December 15, 2028 and interim reporting periods within those annual periods. This ASU may be applied prospectively or retrospectively to any or all periods presented and early adoption of this ASU is permitted. The Company is currently evaluating the provisions of this ASU.

LONG-TERM INVESTMENTS - Available-for-Sale Debt Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investments, All Other Investments [Abstract]
Amortized cost	$ 7,381	$ 7,269
Estimated fair value	$ 9,853	$ 9,703

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Name Accounting Standards Codification
-Section 55
-Paragraph 10
-SubTopic 10
-Topic 825
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-10

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 11
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-11

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-10

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482881/825-10-55-12

Reference 10: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 103
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-103

Reference 11: http://www.xbrl.org/2003/role/exampleRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 100
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482078/820-10-55-100

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482106/820-10-50-2

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 14: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

+ Details

STOCK-BASED COMPENSATION - Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	$ 5,621	$ 9,817
Cost of revenue
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	348	529
Sales and marketing expense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	1,492	2,157
Research and development expense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	1,842	2,775
General and administrative expense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	$ 1,939	$ 4,356

REVENUE FROM CONTRACTS WITH CUSTOMERS - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregated Revenue Information [Abstract]
Revenues	$ 231,263	$ 172,347
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment
Disaggregated Revenue Information [Abstract]
Revenues	122,482	129,569
ECP (front-end and packaging), Furnace and Other Technologies
Disaggregated Revenue Information [Abstract]
Revenues	84,239	27,630
Advanced Packaging (excluding ECP), Services & Spares
Disaggregated Revenue Information [Abstract]
Revenues	$ 24,542	$ 15,148

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 8: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 9: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479941/924-10-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 30
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-30

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-4

+ Details

OTHER PAYABLES AND ACCRUED EXPENSES

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

OTHER PAYABLES AND ACCRUED EXPENSES

At March 31, 2026 and December 31, 2025, other payables and accrued expenses consisted of the following:


	March 31, 2026		December 31, 2025
Accrued commissions	$	28,074	$	26,931
Accrued warranty	19,299		19,104
Accrued payroll	29,839		24,830
Accrued machine sales fees	13,104		13,341
Accrued Lingang construction fees	12,736		24,258
Individual income tax payable	17,797		19,552
Payable for investments	4,913		4,838
Advances from employees for option exercises (1)	12,139		—
Others	22,174		17,542
Total	$	160,075	$	150,396

(1) This amount represents exercise price proceeds from employees who have satisfied vesting conditions and exercised the options, pending formal share registration and issuance under ACMR Shanghai’s 2023 Subsidiary Option Plan.

Warranties

The Company provides standard warranties on its products. The liability amount is based on actual historical warranty spending activity by type of product, customer, and geographic region, modified for any known differences such as the impact of product reliability improvements.

Changes in the Company’s accrued warranty were as follows:


	March 31,		March 31,
	2026		2025
Balance at beginning of period	$	19,104	$	12,710
Additions	3,314		2,534
Utilized	(3,119)		(2,002)
Balance at end of period	$	19,299	$	13,242

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Mar. 31, 2026 shares
Trading Arrangements, by Individual
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Sotheara Cheav [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On March 5, 2026, Sotheara Cheav, an executive officer, adopted a Rule 10b5-1 trading arrangement (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 contemporaneous exercise of options and sale of up to 18,750 shares of Class A Common Stock, at specific market prices, commencing on June 4, 2026, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) June 1, 2027, or (iii) such date that the Cheav Plan is otherwise terminated according to its terms, whichever comes first.
Name	Sotheara Cheav
Title	an executive officer,
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	March 5, 2026
Expiration Date	June 1, 2027
Arrangement Duration	362 days
Aggregate Available	18,750

ACCOUNTS RECEIVABLE, NET (Tables)

3 Months Ended

Mar. 31, 2026

Receivables [Abstract]

Accounts Receivable

At March 31, 2026 and December 31, 2025, accounts receivable consisted of the following:


	March 31, 2026		December 31, 2025
Accounts receivable	$	561,586	$	537,095
Less: Allowance for credit losses	(35,079)		(32,845)
Total accounts receivable, net	$	526,507	$	504,250

The movement of the allowance for credit losses for the three months ended March 31, 2026 and 2025 is as follows:


	March 31, 2026		March 31, 2025
Allowance for credit losses, at beginning of the year	$	(32,845)	$	(18,347)
Provision for (reversal of) credit loss	(2,234)		9
Allowance for credit losses, at the end of the period	$	(35,079)	$	(18,338)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 872,269		$ 757,373
ACM Shanghai
Cash and Cash Equivalent [Abstract]
Cash payments for procurement of goods and services	3,258	$ 2,674
United States
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	111,269		107,184
Mainland China
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	310,700		228,777
China Hong Kong
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	447,027		421,104
Korea
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	2,006		241
Singapore
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 1,267		$ 67

LONG-TERM INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2026

Long-Term Investments [Abstract]

Long-Term Investment

The Company's long-term investments consist of the following:


	March 31, 2026		December 31, 2025
Equity-method investments:
Ninebell Co., Ltd (“Ninebell”)	$	32,692	$	31,310
Wooil Flucon Co., ("Wooil")	965		893
Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")	5,045		4,411
Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) ("Hefiei Shixi")	4,945		5,335
Company A	4,335		4,269
Subtotal	47,982		46,218
Equity investments without readily determinable fair value using the measurement alternative	10,632		10,114
Available for sale debt securities	9,853		9,703
Total long-term investments	$	68,467	$	66,035

Debt Securities, Available-for-Sale

The following table summarizes the amortized cost and estimated fair value of the Company’s available-for-sale debt investments at March 31, 2026 and December 31, 2025.


	March 31, 2026	December 31, 2025
Amortized cost	7,381	7,269
Estimated fair value	9,853	9,703

- Definition

Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-9

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (aaa)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

+ Details

SEGMENT INFORMATION (Tables)

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

Long-Lived Assets by Geography

Long-lived assets by geographic region as of the periods ended were as follows:


	March 31, 2026		December 31, 2025
Long-lived assets by geography:
Mainland China	$	330,301	$	321,748
Korea	7,662		8,868
United States	9,891		9,465
Total	$	347,854	$	340,081

RELATED PARTY BALANCES AND TRANSACTIONS (Tables)

3 Months Ended

Mar. 31, 2026

Related Party Balances and Transactions

The following tables reflect related party transactions in the Company's condensed consolidated financial statements:


	March 31, 2026		December 31, 2025
Advances to related party
Ninebell	$	163	$	163
Shengyi	707		2,337
Total	$	870	$	2,500


	March 31, 2026		December 31, 2025
Accounts payable
Ninebell	$	19,288	$	20,353
Shengyi	12,503		11,707
Total	$	31,791	$	32,060


	Three Months Ended March 31,
Purchase of materials	2026		2025
Ninebell	$	16,701	$	8,812
Shengyi	3,442		1,904
Total	$	20,143	$	10,716


	Three Months Ended March 31,
Service fee charged by	2026		2025
Shengyi	$	50	$	273

SHORT-TERM INVESTMENTS (Tables)

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

Components of Trading Securities

At March 31, 2026 and December 31, 2025, the components of short-term investments were as follows:


	March 31, 2026		December 31, 2025
Short-term investments listed in Shanghai Stock Exchange
Cost	$	17,340	$	17,076
Market value	34,662		35,524

Unrealized Gain (Loss) on Trading Securities

For the three months ended March 31, 2026 and 2025, the net losses recognized on equity securities were as follows:


	Three Months Ended March 31,
	2026		2025
Unrealized losses recognized during the reporting period on short-term investments still held at March 31	$	(1,406)	$	(1,082)
Total losses recognized at March 31 on short-term investments	$	(1,406)	$	(1,082)

ACCOUNTS RECEIVABLE, NET

3 Months Ended

Mar. 31, 2026

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

At March 31, 2026 and December 31, 2025, accounts receivable consisted of the following:


	March 31, 2026		December 31, 2025
Accounts receivable	$	561,586	$	537,095
Less: Allowance for credit losses	(35,079)		(32,845)
Total accounts receivable, net	$	526,507	$	504,250

The Company assesses collectability by reviewing accounts receivable on a general basis where similar characteristics exist. 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, and other factors that may affect the Company’s ability to collect from customers.

The movement of the allowance for credit losses for the three months ended March 31, 2026 and 2025 is as follows:


	March 31, 2026		March 31, 2025
Allowance for credit losses, at beginning of the year	$	(32,845)	$	(18,347)
Provision for (reversal of) credit loss	(2,234)		9
Allowance for credit losses, at the end of the period	$	(35,079)	$	(18,338)

PROPERTY, PLANT AND EQUIPMENT, NET (Tables)

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

At March 31, 2026 and December 31, 2025, property, plant and equipment consisted of the following:


	March 31, 2026		December 31, 2025
Buildings and plants	$	233,195	$	229,731
Land	2,099		2,099
Manufacturing and testing equipment	85,387		70,680
Computer and office equipment	9,449		9,339
Transportation equipment	707		693
Leasehold improvement	13,213		12,656
Construction in progress	23,895		28,396
Total cost	367,945		353,594
Less: Total accumulated depreciation	(43,925)		(38,764)
Total property, plant and equipment, net	$	324,020	$	314,830

DESCRIPTION OF BUSINESS (Details)	Mar. 31, 2026	Feb. 06, 2026	Feb. 05, 2026	Dec. 31, 2025
ACM Research (Shanghai), Inc. ("ACM Shanghai")
Description of Business [Abstract]
Effective interest held as at	73.60%	73.60%	74.60%	74.60%
ACM Research (Wuxi), Inc. ("ACM Wuxi")
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
CleanChip Technologies Limited ("CleanChip")
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
ACM Research Korea CO., LTD. ("ACM Korea")
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
ACM Research ( Lingang), Inc. ("ACM Lingang")
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
ACM Research (CA), Inc. ("ACM California")
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
ACM Research (Cayman), Inc.
Description of Business [Abstract]
Effective interest held as at	100.00%			100.00%
ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")
Description of Business [Abstract]
Effective interest held as at	100.00%			100.00%
ACM Research (Beijing), Inc. ("ACM Beijing")
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
Hanguk ACM CO., LTD
Description of Business [Abstract]
Effective interest held as at	100.00%			100.00%
Yusheng Micro Semiconductor (Shanghai) Co., Ltd.
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.
Description of Business [Abstract]
Effective interest held as at	53.80%			54.50%
ACM Research (Chengdu), Inc. ("ACM Chengdu")
Description of Business [Abstract]
Effective interest held as at	73.60%			74.60%
Shengyi Micro Semiconductor (Shanghai) Co., Ltd.
Description of Business [Abstract]
Effective interest held as at	62.50%			63.40%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Basic and Diluted Net Income per Common Share (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2026 USD ($) class $ / shares shares	Mar. 31, 2025 USD ($) $ / shares shares
Numerator:
Net income	$ 26,235	$ 25,013
Less: Net income attributable to non-controlling interests	8,928	4,633
Net income available to common stockholders, basic	17,307	20,380
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	302	312
Net income available to common stockholders, diluted	$ 17,005	$ 20,068
Weighted average shares outstanding, basic (in shares) \| shares	65,804,254	63,267,834
Effect of dilutive securities (in shares) \| shares	3,965,653	3,684,940
Weighted average shares outstanding, diluted (in shares) \| shares	69,769,907	66,952,774
Net income per share of common stock:
Basic (in dollars per share) \| $ / shares	$ 0.26	$ 0.32
Diluted (in dollars per share) \| $ / shares	$ 0.24	$ 0.30
Classes of common stock outstanding \| class	2
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares) \| shares	809	1,298,408

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

3 Months Ended

Mar. 31, 2026

Revenue from Contract with Customer [Abstract]

Disaggregated Revenue Information


	Three Months Ended March 31,
	2026		2025
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment	$	122,482	$	129,569
ECP (front-end and packaging), Furnace and Other Technologies	84,239		27,630
Advanced Packaging (excluding ECP), Services & Spares	24,542		15,148
Total revenue	$	231,263	$	172,347

Accounts Receivables and Contract Liabilities

Below are the contract liabilities balances as of:


	March 31, 2026		December 31, 2025
Advances from customers	$	168,825	$	187,809
Deferred revenue	10,954		17,388
Total contract liabilities	$	179,779	$	205,197

Below are revenues recognized from amounts included in contract liabilities at the beginning of the year.


	Three Months Ended March 31,
	2026		2025
Revenue recognized from amounts included in contract liabilities at the beginning of the periods	$	86,078	$	62,119

LONG-TERM INVESTMENTS - Summary of Long Term Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Long-Term Investments [Line Items]
Equity-method investments	$ 47,982	$ 46,218
Equity Securities without Readily Determinable Fair Value, Amount	10,632	10,114
Debt Securities, Available-for-Sale, Noncurrent	9,853	9,703
Long-term investments (note 10)	68,467	66,035
Ninebell Co., Ltd (“Ninebell”)
Long-Term Investments [Line Items]
Equity-method investments	32,692	31,310
Wooil Flucon Co., ("Wooil")
Long-Term Investments [Line Items]
Equity-method investments	965	893
Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")
Long-Term Investments [Line Items]
Equity-method investments	5,045	4,411
Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) ("Hefiei Shixi")
Long-Term Investments [Line Items]
Equity-method investments	4,945	5,335
Company A
Long-Term Investments [Line Items]
Equity-method investments	$ 4,335	$ 4,269

RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Purchase of materials	$ 20,143	$ 10,716
Cost of revenue, related party	124,025	89,797
Ninebell
Related Party Transaction [Line Items]
Purchase of materials	16,701	8,812
Shengyi
Related Party Transaction [Line Items]
Purchase of materials	3,442	1,904
Related Party
Related Party Transaction [Line Items]
Advances to related party	870		$ 2,500
Accounts payable	31,791		32,060
Cost of revenue, related party	12,483	9,399
Related Party \| Ninebell
Related Party Transaction [Line Items]
Advances to related party	163		163
Accounts payable	19,288		20,353
Related Party \| Shengyi
Related Party Transaction [Line Items]
Advances to related party	707		2,337
Accounts payable	12,503		$ 11,707
Cost of revenue, related party	$ 50	$ 273

- Definition

The aggregate cost of goods produced and sold and services rendered during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 28
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-28

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(g)(1)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1A
-Subparagraph (SX 210.13-01(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1A

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(A))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iii)(B))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(4)(iv))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1B
-Subparagraph (SX 210.13-02(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480097/470-10-S99-1B

+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-13

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

+ Details

STATUTORY SURPLUS RESERVE	3 Months Ended
STATUTORY SURPLUS RESERVE	Mar. 31, 2026
STATUTORY SURPLUS RESERVE [Abstract]
STATUTORY SURPLUS RESERVE	STATUTORY SURPLUS RESERVE In accordance with mainland China’s Foreign Enterprise Law, ACM Shanghai, ACM Lingang, and ACM Wuxi are required to make appropriation to reserve funds, comprising the statutory surplus reserve and discretionary surplus reserve, based on after-tax net income in accordance with generally accepted accounting principles of mainland China (“mainland China GAAP”). Appropriations to the statutory surplus reserve are required to be at least 10% of the after-tax net income determined in accordance with mainland China GAAP until the reserve is equal to 50% of the entities’ registered capital. The amount is calculated annually at the end of each calendar year. The balances of statutory reserve funds was $34,164 as of both March 31, 2026 and December 31, 2025, and is presented as statutory surplus reserve on the Company’s condensed consolidated balance sheets.

INCOME TAXES (Tables)

3 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

Income Tax Benefit (Expense)

Income tax expense was as follows:


	Three Months Ended March 31,
	2026		2025
Total income tax expense	(3,771)		(2,153)
Effective tax rate	12.6	%	7.9	%

SHORT-TERM INVESTMENTS - Summary of Trading Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Cost	$ 17,340	$ 17,076
Market value	$ 34,662	$ 35,524

REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Disaggregation of Revenue [Line Items]
Increase (decrease) in advances from customers	$ (20,620)	$ (2,804)
First-Tools
Disaggregation of Revenue [Line Items]
Increase (decrease) in advances from customers	$ (18,984)

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 4: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

Reference 9: http://www.xbrl.org/2003/role/exampleRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 91
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479777/606-10-55-91

+ Details

SHORT-TERM INVESTMENTS

3 Months Ended

Mar. 31, 2026

Investments, Debt and Equity Securities [Abstract]

SHORT-TERM INVESTMENTS

At March 31, 2026 and December 31, 2025, the components of short-term investments were as follows:


	March 31, 2026		December 31, 2025
Short-term investments listed in Shanghai Stock Exchange
Cost	$	17,340	$	17,076
Market value	34,662		35,524

For the three months ended March 31, 2026 and 2025, the net losses recognized on equity securities were as follows:


	Three Months Ended March 31,
	2026		2025
Unrealized losses recognized during the reporting period on short-term investments still held at March 31	$	(1,406)	$	(1,082)
Total losses recognized at March 31 on short-term investments	$	(1,406)	$	(1,082)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Time Deposits (Details)	3 Months Ended
	Mar. 31, 2026
Minimum
Deposit Assets [Line Items]
Time deposits, interest rate	1.20%
Maximum
Deposit Assets [Line Items]
Time deposits, interest rate	3.75%

LONG-TERM BORROWINGS - Summary of Long-term Borrowings (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Long-Term Borrowings [Abstract]
Total	$ 234,160	$ 214,012
Less: Current portion	(13,302)	(35,082)
Long-term borrowings (note 9)	220,858	178,930
China Merchants Bank
Long-Term Borrowings [Abstract]
Total	26,943	9,915
Agricultural Bank of China
Long-Term Borrowings [Abstract]
Total	42,656	42,007
Bank of China
Long-Term Borrowings [Abstract]
Total	34,777	34,247
CITIC Bank
Long-Term Borrowings [Abstract]
Total	28,871	28,460
China Everbright Bank
Long-Term Borrowings [Abstract]
Total	33,468	56,807
Industrial and Commercial Bank of China
Long-Term Borrowings [Abstract]
Total	$ 67,445	$ 42,576

INVENTORIES, NET (Details) - USD ($) $ in Thousands	3 Months Ended
INVENTORIES, NET (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Inventory, Net [Abstract]
Raw materials	$ 377,943		$ 349,663
Work-in-process	81,640		61,415
Finished goods	278,412		291,553
Total inventories, net	737,995		702,631
Inventory write-down	5,112	$ 4,523
First-tools, Customer Ownership
Inventory, Net [Abstract]
Finished goods	$ 119,545		$ 145,506

OTHER PAYABLES AND ACCRUED EXPENSES - Other Payables and Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Payables and Accruals [Abstract]
Accrued commissions	$ 28,074	$ 26,931
Accrued warranty	19,299	19,104
Accrued payroll	29,839	24,830
Accrued machine sales fees	13,104	13,341
Accrued Lingang construction fees	12,736	24,258
Individual income tax payable	17,797	19,552
Payable for investments	4,913	4,838
Advances from employees for option exercises (1)	12,139	0
Others	22,174	17,542
Other payables and accrued expenses (note 8)	$ 160,075	$ 150,396

ACCOUNTS RECEIVABLE, NET - Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Accounts Receivable [Abstract]
Accounts receivable	$ 561,586	$ 537,095
Less: Allowance for credit losses	(35,079)	(32,845)
Total accounts receivable, net	$ 526,507	$ 504,250

LONG-TERM INVESTMENTS

3 Months Ended

Mar. 31, 2026

Long-Term Investments [Abstract]

LONG-TERM INVESTMENTS

The Company's long-term investments consist of the following:


	March 31, 2026		December 31, 2025
Equity-method investments:
Ninebell Co., Ltd (“Ninebell”)	$	32,692	$	31,310
Wooil Flucon Co., ("Wooil")	965		893
Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")	5,045		4,411
Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) ("Hefiei Shixi")	4,945		5,335
Company A	4,335		4,269
Subtotal	47,982		46,218
Equity investments without readily determinable fair value using the measurement alternative	10,632		10,114
Available for sale debt securities	9,853		9,703
Total long-term investments	$	68,467	$	66,035

Available-for-sale debt investments

The available-for-sale debt investments are investments in preferred shares that are redeemable at the Company’s option with no contractual maturity date, which are measured at fair value.

The following table summarizes the amortized cost and estimated fair value of the Company’s available-for-sale debt investments at March 31, 2026 and December 31, 2025.


	March 31, 2026	December 31, 2025
Amortized cost	7,381	7,269
Estimated fair value	9,853	9,703

Cover Page - shares	3 Months Ended
Cover Page - shares	Mar. 31, 2026	May 07, 2026
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2026
Document Transition Report	false
Entity File Number	001-38273
Entity Registrant Name	ACM Research, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	94-3290283
Entity Address, Address Line One	42307 Osgood Road, Suite I
Entity Address, City or Town	Fremont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94539
City Area Code	510
Local Phone Number	445-3700
Title of 12(b) Security	Class A Common Stock, $0.0001 par value
Trading Symbol	ACMR
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001680062
Document Fiscal Year Focus	2026
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q1
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		61,233,064
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,991,808

REVENUE FROM CONTRACTS WITH CUSTOMERS - Accounts Receivables and Contract Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
Advances from customers	$ 168,825	$ 187,809
Deferred revenue	10,954	17,388
Total contract liabilities	$ 179,779	$ 205,197

COMMON STOCK	3 Months Ended
COMMON STOCK	Mar. 31, 2026
Equity [Abstract]
COMMON STOCK	COMMON STOCK ACM is 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 of ACM unless such Board of Directors declares different dividends to the Class A common stock and Class B common stock, which is subject to approval from a majority of common stockholders. During the three months ended March 31, 2026, ACM issued 603,044 shares of Class A common stock upon options exercised by employees and an additional 30,003 shares of Class A common stock upon conversion of an equal number of shares of Class B common stock. During the three months ended March 31, 2025, ACM issued 894,040 shares of Class A common stock upon options exercised by employees and non-employees. At March 31, 2026 and December 31, 2025, the number of shares of Class A common stock issued and outstanding was 61,223,064 and 60,590,017, respectively. At March 31, 2026 and December 31, 2025, the number of shares of Class B common stock issued and outstanding was 4,991,808 and 5,021,811, respectively.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8A
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-8A

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478448/946-505-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480237/815-40-50-6

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480008/505-10-S99-1

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/505/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (g)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-13

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-14

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-16

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-18

+ Details

REVENUE FROM CONTRACTS WITH CUSTOMERS - Revenues Recognized (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Revenue from Contract with Customer [Abstract]
Revenue recognized from amounts included in contract liabilities at the beginning of the periods	$ 86,078	$ 62,119

SEGMENT INFORMATION

3 Months Ended

Mar. 31, 2026

Segment Reporting [Abstract]

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.

The CODM assesses financial performance for the Company and decides how to allocate resources based on consolidated revenue, gross margin and income from operations. The CODM considers forecasts and actual results on a regular basis when assessing the operating results and making resource decisions.

Significant expenses within income from operations, as well as within net income, include consolidated cost of revenue, sales and marketing, research and development, and general and administrative, and which are each separately presented on the Company’s condensed consolidated statements of comprehensive income. Other segment items within net income include interest income, interest expense, income (loss) from equity method investments and other expense, net, which are each separately presented on the Company’s condensed consolidated statements of comprehensive income. The measure of segment assets is reported on the Company’s condensed consolidated balance sheets as total assets.

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 and right-of-use assets are attributed to the geographic location in which they are located.

Long-lived assets by geographic region as of the periods ended were as follows:


	March 31, 2026		December 31, 2025
Long-lived assets by geography:
Mainland China	$	330,301	$	321,748
Korea	7,662		8,868
United States	9,891		9,465
Total	$	347,854	$	340,081

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-21

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 31
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-31

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-15

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 48
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-48

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (f)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 11: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 12: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 13: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 14: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 15: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 16: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 54
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-54

Reference 17: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 18: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 19: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-34

Reference 20: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-26C

Reference 21: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-26B

Reference 22: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 40
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-40

Reference 23: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/280/tableOfContent

Reference 24: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 26
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-26

Reference 25: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 41
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-41

+ Details

DESCRIPTION OF BUSINESS - Narrative (Details) $ / shares in Units, $ in Thousands		3 Months Ended
	Feb. 06, 2026 USD ($) $ / shares shares	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Feb. 06, 2026 ¥ / shares
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Gross proceeds from sales of ACM Shanghai's shares		$ 110,243	$ 0
ACM Shanghai
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of shares issued in transaction (in shares) \| shares	4,800,000
Sale of stock, price per share (in USD per share) \| (per share)	$ 23.05			¥ 160.00
Gross proceeds from sales of ACM Shanghai's shares	$ 110,200
Payments for (proceeds from) businesses and interest in affiliates, financing activities, net of tax	$ 86,000

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Summary of Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Assets
Cash and cash equivalents	$ 83,385	$ 84,627
Short-term investments	34,662	35,524
Available-for-sale debt securities	9,853	9,703
Total assets	127,900	129,854
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and cash equivalents	83,385	84,627
Short-term investments	34,662	35,524
Available-for-sale debt securities	0	0
Total assets	118,047	120,151
Significant Other Observable Inputs (Level 2)
Assets
Cash and cash equivalents	0	0
Short-term investments	0	0
Available-for-sale debt securities	0	0
Total assets	0	0
Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents	0	0
Short-term investments	0	0
Available-for-sale debt securities	9,853	9,703
Total assets	$ 9,853	$ 9,703

- Definition

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

+ Details

STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

During the three months ended March 31, 2026, the Company issued option grants for 2,800 shares to employees and board members under 2016 Omnibus Incentive Plan. The share-based awards are accounted for as equity awards, are only subject to service vesting conditions, and vest over a period of 4 years for employees and 0.25 year for board members. The Company did not grant any non-employee stock options during the three months ended March 31, 2026.

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation with following assumptions:


	Three Months Ended March 31, 2026	Three Months Ended March 31, 2025
Fair value of share of common stock(1)	$48.31	$26.46-$29.18
Expected term in years(2)	6.25 years	5.50-6.25
Volatility(3)	84.46%	83.14%-83.28%
Risk-free interest rate(4)	3.92%	4.18%-4.20%
Expected dividend(5)	—%	—%

(1)Fair value of Class A common stock value was closing market price of the Class A common stock 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 U.S. Treasury securities with maturities similar to the expected term of the share options in effect at the time of grant.

(5)Expected dividend is assumed to be 0% as ACM has no history or expectation of paying a dividend on its Class A common stock.

No options were granted under ACM Shanghai 2023 Option Plan during the three months ended March 31, 2026.

Total Stock-Based Compensation Expense

The following table summarizes the components of stock-based compensation expense included in the condensed consolidated statements of comprehensive income:


	Three Months Ended March 31,
	2026		2025
Stock-Based Compensation Expense:
Cost of revenue	$	348	$	529
Sales and marketing expense	1,492		2,157
Research and development expense	1,842		2,775
General and administrative expense	1,939		4,356
Total stock-based compensation expense	$	5,621	$	9,817

INVENTORIES, NET (Tables)

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

Inventories

At March 31, 2026 and December 31, 2025, inventories consisted of the following:


	March 31, 2026		December 31, 2025
Raw materials	$	377,943	$	349,663
Work-in-process	81,640		61,415
Finished goods	278,412		291,553
Total inventories, net	$	737,995	$	702,631

PROPERTY, PLANT AND EQUIPMENT, NET

3 Months Ended

Mar. 31, 2026

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT, NET

At March 31, 2026 and December 31, 2025, property, plant and equipment consisted of the following:


	March 31, 2026		December 31, 2025
Buildings and plants	$	233,195	$	229,731
Land	2,099		2,099
Manufacturing and testing equipment	85,387		70,680
Computer and office equipment	9,449		9,339
Transportation equipment	707		693
Leasehold improvement	13,213		12,656
Construction in progress	23,895		28,396
Total cost	367,945		353,594
Less: Total accumulated depreciation	(43,925)		(38,764)
Total property, plant and equipment, net	$	324,020	$	314,830

Depreciation expense for the three months ended March 31, 2026 and 2025 was $5,161 and $2,385, respectively.

At March 31, 2026, buildings and plants includes $36,088 for the Lingang housing property which is pledged as security for loans from the China Merchants Bank (note 9).

SHORT-TERM INVESTMENTS - Summary of Unrealized Gain (Loss) on Trading Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Unrealized losses recognized during the reporting period on short-term investments still held at March 31	$ (1,406)	$ (1,082)
Total losses recognized at March 31 on short-term investments	$ (1,406)	$ (1,082)

ACCOUNTS RECEIVABLE, NET - Summary of Allowance For Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ (32,845)	$ (18,347)
Provision for (reversal of) credit loss	(2,234)	9
Ending balance	$ (35,079)	$ (18,338)

COMMON STOCK (Details)	3 Months Ended
COMMON STOCK (Details)	Mar. 31, 2026 vote $ / shares shares	Mar. 31, 2025 shares	Dec. 31, 2025 shares	Dec. 31, 2024 shares
Common Stock Class A
Class of Stock Disclosures [Abstract]
Common stock, shares authorized (in shares)	150,000,000
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001
Number of votes for each share entitled \| vote	1
Exercise of stock options (in shares)	603,044
Common stock issued (in shares)	61,223,064		60,590,017
Common stock outstanding (in shares)	61,223,064		60,590,017
Common Stock Class A \| Common Stock
Class of Stock Disclosures [Abstract]
Conversion of Class B common stock to Class A common stock	30,003
Exercise of stock options (in shares)	603,044	894,040
Common stock outstanding (in shares)	61,223,064	58,832,925	60,590,017	57,938,885
Class B Common Stock
Class of Stock Disclosures [Abstract]
Common stock, shares authorized (in shares)	5,307,816
Common stock, par value (in dollars per share) \| $ / shares	$ 0.0001
Number of votes for each share entitled \| vote	20
Conversion of Class B common stock to Class A common stock	1
Common stock issued (in shares)	4,991,808		5,021,811
Common stock outstanding (in shares)	4,991,808		5,021,811
Class B Common Stock \| Common Stock
Class of Stock Disclosures [Abstract]
Conversion of Class B common stock to Class A common stock	(30,003)
Common stock outstanding (in shares)	4,991,808	5,021,811	5,021,811	5,021,811

PROPERTY, PLANT AND EQUIPMENT, NET (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	$ 367,945	$ 353,594
Less: Total accumulated depreciation	(43,925)	(38,764)
Total property, plant and equipment, net	324,020	314,830
Buildings and plants
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	233,195	229,731
Land
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	2,099	2,099
Manufacturing and testing equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	85,387	70,680
Computer and office equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	9,449	9,339
Transportation equipment
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	707	693
Leasehold improvement
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	13,213	12,656
Construction in Progress
Property, Plant and Equipment, Net, by Type [Abstract]
Total cost	$ 23,895	$ 28,396

PROPERTY, PLANT AND EQUIPMENT, NET - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 5,161	$ 2,385
Total cost	367,945		$ 353,594
Land, Buildings, And Plants \| ACM Research ( Lingang), Inc. ("ACM Lingang")
Property, Plant and Equipment [Line Items]
Total cost	$ 36,088

- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References + Details

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents	$ 872,269	$ 757,373
Restricted cash	21,866	8,589
Short-term time deposits (note 2)	358,237	366,591
Short-term investments (note 11)	34,662	35,524
Accounts receivable, net (note 4)	526,507	504,250
Inventories, net (note 5)	737,995	702,631
Prepaid expenses and other current assets	13,352	10,567
Total current assets	2,619,353	2,436,680
Property, plant and equipment, net (note 6)	324,020	314,830
Operating lease right-of-use assets, net	17,060	17,925
Intangible assets, net	2,722	2,847
Deferred tax assets (note 15)	30,224	29,389
Long-term investments (note 10)	68,467	66,035
Other long-term assets	4,052	4,479
Total assets	3,065,898	2,872,185
Current liabilities:
Short-term borrowings (note 7)	93,981	74,041
Current portion of long-term borrowings (note 9)	13,302	35,082
Advances from customers	168,825	187,809
Deferred revenue	10,954	17,388
Income taxes payable (note 15)	24,780	991
FIN-48 payable (note 15)	28,308	27,719
Other payables and accrued expenses (note 8)	160,075	150,396
Current portion of operating lease liabilities	4,795	4,786
Total current liabilities	745,678	745,712
Long-term borrowings (note 9)	220,858	178,930
Long-term operating lease liabilities	4,125	5,069
Other long-term liabilities	11,765	11,965
Total liabilities	982,426	941,676
Commitments and contingencies (note 16)
Stockholders’ equity:
Additional paid-in capital	1,194,786	1,115,504
Retained earnings	367,735	350,428
Statutory surplus reserve (note 18)	34,164	34,164
Accumulated other comprehensive loss	(15,182)	(35,740)
Total ACM Research, Inc. stockholders’ equity	1,581,510	1,464,363
Non-controlling interests	501,962	466,146
Total equity	2,083,472	1,930,509
Total liabilities and equity	3,065,898	2,872,185
Class A Common Stock
Stockholders’ equity:
Common stock	6	6
Class B Common Stock
Stockholders’ equity:
Common stock	1	1
Related Party
Current assets:
Other receivables	870	2,500
Current liabilities:
Accounts payable	31,791	32,060
Nonrelated Party
Current assets:
Other receivables	53,595	48,655
Current liabilities:
Accounts payable	$ 208,867	$ 215,440

OTHER PAYABLES AND ACCRUED EXPENSES - Schedule of Product Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 19,104	$ 12,710
Additions	3,314	2,534
Utilized	(3,119)	(2,002)
Balance at end of period	$ 19,299	$ 13,242

STOCK-BASED COMPENSATION, Assumptions Used to Determine Fair Value of Share Options Granted (Details) - Employee Share Option - Service Period Based - $ / shares	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of common share (in dollars per share)	$ 48.31
Expected term	6 years 3 months
Volatility	84.46%
Volatility minimum		83.14%
Volatility maximum		83.28%
Risk free interest rate minimum		4.18%
Risk free interest rate maximum		4.20%
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions, Risk Free Interest Rate	3.92%
Expected dividend rate	0.00%	0.00%
Minimum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of common share (in dollars per share)		$ 26.46
Expected term		5 years 6 months
Maximum
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of common share (in dollars per share)		$ 29.18
Expected term		6 years 3 months

Condensed Consolidated Statements of Operations and Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cost of revenue, related party	$ 124,025	$ 89,797
Other comprehensive income (loss), foreign currency translation adjustment, tax	0	0
Related Party
Cost of revenue, related party	$ 12,483	$ 9,399

- Definition

The aggregate cost of goods produced and sold and services rendered during the reporting period.

+ References

+ Details

LONG-TERM BORROWINGS

3 Months Ended

Mar. 31, 2026

Long-Term Debt, by Current and Noncurrent [Abstract]

LONG-TERM BORROWINGS

At March 31, 2026 and December 31, 2025, long term borrowings consisted of loan facilities from the following financial institutions:


`	March 31,		December 31,
	2026		2025
China Merchants Bank	$	26,943	$	9,915
Agricultural Bank of China	42,656		42,007
Bank of China	34,777		34,247
China CITIC Bank	28,871		28,460
China Everbright Bank	33,468		56,807
Industrial and Commercial Bank of China	67,445		42,576
Total borrowings	234,160		214,012
Less: Current portion	(13,302)		(35,082)
Total long-term borrowings, net of current portion	$	220,858	$	178,930

China Merchants Bank

In January 2026, ACM Shanghai entered into a long-term loan facility of $17,340 from China Merchants Bank. Principal repayments shall be made in six installments beginning July 2026, with final maturity in January 2029. The loan bears interest at an annual rate of 2.38%.

Bank of China

Certain covenants for the banking facility require ACM Shanghai’s year-end outstanding interest-bearing debt not to exceed five times its annual EBITDA, and to comply with other non-financial covenants, or Bank of China has the right to suspend the facility, or request ACM Shanghai to accelerate repayment or provide credit enhancement. As of March 31, 2026, the Company was in compliance with the applicable covenants.

Industrial and Commercial Bank of China

In March 2026, ACM Shanghai entered into a long-term loan facility of $24,198. Principal repayments shall be made in six installments beginning September 2026, with final maturity in March 2029. The loan bears interest at an annual rate of 2.29%.

Additional Long-term Borrowings

As of March 31, 2026 and December 31, 2025, the total carrying amount of long-term loans was $234,160 and $214,012, compared with an estimated fair value of $221,344 and $202,706, 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).

Scheduled principal payments for the outstanding long-term loans, including the current portion, as of March 31, 2026 are as follows:


Year ending December 31
Remainder of 2026	$	11,824
2027	105,689
2028	43,856
2029	44,787
2030 and thereafter	28,004
Total	$	234,160

SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended
SEGMENT INFORMATION (Details) $ in Thousands	Mar. 31, 2026 USD ($) segment	Dec. 31, 2025 USD ($)
Segment Reporting [Abstract]
Number of reportable segments \| segment	1
Number of operating segments \| segment	1
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 347,854	$ 340,081
Mainland China
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	330,301	321,748
Korea
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	7,662	8,868
United States
Geographic Areas, Long-Lived Assets [Abstract]
Long-lived assets	$ 9,891	$ 9,465

SHORT-TERM BORROWINGS	3 Months Ended
SHORT-TERM BORROWINGS	Mar. 31, 2026
Debt Disclosure [Abstract]
SHORT-TERM BORROWINGS	SHORT-TERM BORROWINGS Short-term borrowings as of March 31, 2026 and December 31, 2025 amounted to $93,981 and $74,041, respectively, which consisted of RMB denominated borrowings made by the Company’s subsidiaries from financial institutions in mainland China and were repayable within one year. As of March 31, 2026 and December 31, 2025, the weighted average interest rates for the outstanding borrowings were 2.2% and 2.5%, respectively. As of March 31, 2026 and December 31, 2025, the Company was in compliance with the applicable covenants. The Company's short-term borrowings of $14,459 from Bank of China have certain covenants which require ACM Shanghai’s year-end outstanding interest-bearing debt not to exceed five times of its annual EBITDA, and to comply with other non-financial covenants; otherwise, Bank of China has the right to suspend the facility, or request ACM Shanghai to accelerate repayment or provide credit enhancement.

COMMITMENTS AND CONTINGENCIES	3 Months Ended
COMMITMENTS AND CONTINGENCIES	Mar. 31, 2026
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES As of March 31, 2026, the Company had $1,075 of open capital commitments to construction contracts. Covenants in ACM Lingang’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 Lingang pay liquidated damages in the event that within 9 years after the land use right was obtained in July 2020, 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 80% of RMB157.60 million ($22.8 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. During the year ended December 31, 2025, the contract was amended to extend the deadline until December 12, 2029. Legal Matters In the normal course of business, the Company is subject to contingencies, including legal proceedings, investigations, and environmental claims arising out of the normal course of business 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 un-estimable damages. In 2025, ACM's subsidiary, ACM Korea, received inquiries from the Seoul Customs Office ("SCO") regarding certain goods produced and shipped by ACM Korea to overseas markets. As of December 31, 2025, the SCO completed its investigation and issued a fine to ACM Korea, which ACM Korea paid and has formally appealed. The matter was subsequently transferred to a regional prosecutor’s office in Korea, and in April, 2026, ACM Korea received official notice from a regional prosecutor's office in Korea that its investigation into this matter has been officially dismissed with no charges. The Company’s management has evaluated all proceedings and claims that existed as of March 31, 2026. In the opinion of management no additional provision for liability nor disclosure was required as of March 31, 2026 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 March 31, 2026, the Company had no material outstanding legal proceedings.

LONG-TERM BORROWINGS - Summary of Scheduled Principal Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Principal Payments of Long-Term Loan [Abstract]
Remainder of 2026	$ 11,824
2027	105,689
2028	43,856
2029	44,787
2030 and thereafter	28,004
Total	$ 234,160	$ 214,012

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 55
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482949/835-30-55-8

Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-1D

Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481139/470-20-50-4

+ Details

STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2026

Share-Based Payment Arrangement [Abstract]

Assumptions Used to Determine Fair Value of Options Granted

The fair value of options granted to employees is estimated on the grant date using the Black-Scholes valuation with following assumptions:


	Three Months Ended March 31, 2026	Three Months Ended March 31, 2025
Fair value of share of common stock(1)	$48.31	$26.46-$29.18
Expected term in years(2)	6.25 years	5.50-6.25
Volatility(3)	84.46%	83.14%-83.28%
Risk-free interest rate(4)	3.92%	4.18%-4.20%
Expected dividend(5)	—%	—%

(1)Fair value of Class A common stock value was closing market price of the Class A common stock 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 U.S. Treasury securities with maturities similar to the expected term of the share options in effect at the time of grant.

(5)Expected dividend is assumed to be 0% as ACM has no history or expectation of paying a dividend on its Class A common stock.

Summary of Components of Stock-based Compensation Expense

The following table summarizes the components of stock-based compensation expense included in the condensed consolidated statements of comprehensive income:


	Three Months Ended March 31,
	2026		2025
Stock-Based Compensation Expense:
Cost of revenue	$	348	$	529
Sales and marketing expense	1,492		2,157
Research and development expense	1,842		2,775
General and administrative expense	1,939		4,356
Total stock-based compensation expense	$	5,621	$	9,817

LONG-TERM BORROWINGS (Tables)

3 Months Ended

Mar. 31, 2026

Long-Term Debt, by Current and Noncurrent [Abstract]

Long-Term Borrowings

At March 31, 2026 and December 31, 2025, long term borrowings consisted of loan facilities from the following financial institutions:


`	March 31,		December 31,
	2026		2025
China Merchants Bank	$	26,943	$	9,915
Agricultural Bank of China	42,656		42,007
Bank of China	34,777		34,247
China CITIC Bank	28,871		28,460
China Everbright Bank	33,468		56,807
Industrial and Commercial Bank of China	67,445		42,576
Total borrowings	234,160		214,012
Less: Current portion	(13,302)		(35,082)
Total long-term borrowings, net of current portion	$	220,858	$	178,930

Principal Payments for Outstanding Long-Term Loan

Scheduled principal payments for the outstanding long-term loans, including the current portion, as of March 31, 2026 are as follows:


Year ending December 31
Remainder of 2026	$	11,824
2027	105,689
2028	43,856
2029	44,787
2030 and thereafter	28,004
Total	$	234,160

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-SubTopic 10
-Topic 210
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-4

Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-3

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69B

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69E
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69E

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 835
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482925/835-30-45-2

Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477734/942-470-50-3

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-8

Reference 11: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-6

Reference 12: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

+ Details

STATUTORY SURPLUS RESERVE (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Retained Earnings (Accumulated Deficit) [Abstract]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	$ 34,164	$ 34,164
ACM Research (Shanghai), Inc. ("ACM Shanghai")
Retained Earnings (Accumulated Deficit) [Abstract]
Statutory Accounting Practices, Statutory Capital and Surplus, Balance	$ 34,164	$ 34,164

LONG-TERM BORROWINGS - Narrative (Details) $ in Thousands	1 Months Ended
LONG-TERM BORROWINGS - Narrative (Details) $ in Thousands	Mar. 31, 2026 USD ($) installment	Jan. 31, 2026 USD ($) installment	Dec. 31, 2025 USD ($)
Line of Credit Facility [Line Items]
Long-term debt	$ 234,160		$ 214,012
Long-term debt, fair value	221,344		202,706
China Merchants Bank
Line of Credit Facility [Line Items]
Line of credit facility, interest rate during period		2.38%
Line of credit facility, maximum borrowing capacity		$ 17,340
Number of installments for loan repayable \| installment		6
Long-term debt	$ 26,943		9,915
Industrial and Commercial Bank of China
Line of Credit Facility [Line Items]
Line of credit facility, interest rate during period	2.29%
Line of credit facility, maximum borrowing capacity		$ 24,198
Number of installments for loan repayable \| installment	6
Long-term debt	$ 67,445		$ 42,576

- Definition

Amount, after deduction of unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

+ References

+ Details

- Definition

The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission.

+ References

+ Details

INVENTORIES, NET

3 Months Ended

Mar. 31, 2026

Inventory Disclosure [Abstract]

INVENTORIES, NET

At March 31, 2026 and December 31, 2025, inventories consisted of the following:


	March 31, 2026		December 31, 2025
Raw materials	$	377,943	$	349,663
Work-in-process	81,640		61,415
Finished goods	278,412		291,553
Total inventories, net	$	737,995	$	702,631

At March 31, 2026 and December 31, 2025, the value of finished goods inventory of which were first-tools at customer physical locations for which customers were contractually obligated to take ownership upon acceptance totaled $119,545 and $145,506, respectively.

During the three months ended March 31, 2026 and 2025, provisions for inventory recognized in cost of revenue were $5,112 and $4,523, respectively.

DESCRIPTION OF BUSINESS

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF BUSINESS

ACM Research, Inc. (“ACM” or “ACM Research”) and its subsidiaries (collectively with ACM, the “Company”) develop, manufacture and sell capital equipment to the global semiconductor industry.

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

Effective interest held as at

Subsidiary

Place and date of incorporation

Principal Activities

March 31,
2026

December 31,
2025

ACM Research (Shanghai), Inc. ("ACM Shanghai")

Mainland China, May 2005

Principal operating subsidiary

73.6%

74.6%

ACM Research (Wuxi), Inc. ("ACM Wuxi")

Mainland China, July 2011

Sales and services

73.6%

74.6%

CleanChip Technologies Limited ("CleanChip")

Hong Kong, June 2017

Trading partner between ACM Shanghai and its customers

73.6%

74.6%

ACM Research Korea CO., LTD. ("ACM Korea")

Republic of Korea ("South Korea"), December 2017

Sales, marketing, R&D, production

73.6%

74.6%

ACM Research (Lingang), Inc. ("ACM Lingang")

Mainland China, March 2019

Management of production activities

73.6%

74.6%

ACM Research (CA), Inc. ("ACM California")

USA, April 2019

Procurement for ACM Shanghai

73.6%

74.6%

ACM Research (Cayman), Inc.

Cayman Islands, April 2019

Administrative function (inactive)

100.0%

ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")

Singapore, August 2021

Sales, marketing, business development

100.0%

ACM Research (Beijing), Inc. ("ACM Beijing")

Mainland China, February 2022

Sales and services

73.6%

74.6%

Hanguk ACM CO., LTD

South Korea, March 2022

Sales, services, business development

100.0%

Yusheng Micro Semiconductor (Shanghai) Co., Ltd.

Mainland China, June 2023

Business development

73.6%

74.6%

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

Mainland China, June 2023

Component development and production

53.8%

54.5%

ACM Research (Chengdu), Inc. ("ACM Chengdu")

Mainland China, December 2024

Sales and services

73.6%

74.6%

Shengyi Micro Semiconductor (Shanghai) Co., Ltd.

Mainland China, December 2024

Business development

62.5%

63.4%

On February 6, 2026, ACM completed the sale of approximately 4.8 million shares of ACM Shanghai at a price of RMB160.00 per share (approximately $23.05 per share based on the exchange rate in effect on the date of the sale), generating approximately $110.2 million in gross proceeds and approximately $86 million net of taxes. Following the transaction, ACM’s ownership percentage in ACM Shanghai decreased from

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Cash flows from operating activities:
Net income	$ 26,235	$ 25,013
Adjustments to reconcile net income to net cash (used in) provided by operating activities:
Non-cash operating lease cost	1,182	1,086
Depreciation and amortization	5,466	3,017
Income from equity method investments	(1,749)	(952)
Unrealized loss on short-term investments	1,406	1,082
Inventory provision	5,112	4,523
Provision for (reversal of) credit losses	2,234	(9)
Deferred income taxes	(503)	(1,661)
Stock-based compensation	5,621	9,817
Dividends from unconsolidated affiliates	518	0
Others	0	1,039
Net changes in operating assets and liabilities:
Accounts receivable	(8,323)	190
Other receivables	(406)	7,126
Inventories	(29,545)	(15,108)
Advances to related parties	1,630	(360)
Prepaid expenses and other current assets	(2,538)	(3,136)
Related parties accounts payable	(268)	3,152
Other long-term assets	23	0
Accounts payable	(14,250)	(23,372)
Advances from customers	(20,620)	(2,804)
Deferred revenue	(6,434)	2,243
Income taxes payable	1,385	(6,630)
FIN-48 payable	589	17
Other payables and accrued expenses	5,149	2,431
Operating lease liabilities	(1,252)	(1,053)
Other long-term liabilities	(200)	(369)
Net cash (used in) provided by operating activities	(29,538)	5,282
Cash flows from investing activities:
Purchase of property and equipment	(22,201)	(16,726)
Purchase of intangible assets	(235)	(375)
Purchase of time deposits	0	(10,000)
Proceeds from redemption and maturity of time deposits	13,005	10,261
Purchase of long-term investments	(361)	0
Net cash used in investing activities	(9,792)	(16,840)
Cash flows from financing activities:
Proceeds from short-term borrowings	36,125	17,056
Repayments of short-term borrowings	(17,340)	(24,961)
Proceeds from long-term borrowings	41,538	52,701
Repayments of long-term borrowings	(24,706)	(455)
Capital contribution by non-controlling shareholder	0	138
Gross proceeds from sales of ACM Shanghai's shares	110,243	0
Proceeds from exercise of stock options	17,536	22,729
Net cash provided by financing activities	163,396	67,208
Effect of exchange rate changes on cash, cash equivalents and restricted cash	4,106	866
Net increase in cash, cash equivalents and restricted cash	128,172	56,516
Cash, cash equivalents and restricted cash at beginning of period	765,963	411,310
Cash, cash equivalents and restricted cash at end of period	894,135	467,826
Supplemental disclosure of cash flow information:
Interest paid	1,933	1,558
Cash paid for income taxes	2,062	10,801
Reconciliation of cash, cash equivalents and restricted cash:
Cash and cash equivalents	872,269	457,240
Restricted cash	21,866	10,586
Cash, cash equivalents and restricted cash	894,135	467,826
Non-cash financing activities:
Cashless exercise of stock options	0	160
Non-cash investing activities:
Transfer of prepayment for property to property, plant and equipment	47	9
Transfer from other non-current assets to long-term investment	0	16,737
Purchases of property, plant and equipment through other payable and accrued expenses	$ 13,183	$ 23,430

INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Income Taxes [Abstract]
Income tax expense	$ 3,771	$ 2,153
Capitalized contract cost, amortization period	15 years
Unrecognized tax benefits	$ 20,905		$ 20,905
Unrecognized tax benefits that would impact effective tax rate	20,770		$ 20,770
Interest or penalties	$ 822	$ 404
Foreign Tax Authority
Income Taxes [Abstract]
Foreign corporate tax rate	25.00%

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-10

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (a)
-SubTopic 20
-Topic 740
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482659/740-20-45-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-SubTopic 10
-Topic 235
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Revenue (note 3)	$ 231,263	$ 172,347
Cost of revenue, including cost of revenue from related parties of $12,483 for the three months ended March 31, 2026 and $9,399 for the three months ended March 31, 2025, respectively	124,025	89,797
Gross profit	107,238	82,550
Operating expenses:
Sales and marketing	20,688	16,343
Research and development	36,549	27,503
General and administrative	13,824	12,927
Total operating expenses	71,061	56,773
Income from operations	36,177	25,777
Interest income	4,719	3,339
Interest expense	(1,933)	(1,558)
Unrealized loss on short-term investments (note 11)	(1,406)	(1,082)
Other expense, net	(9,300)	(262)
Income from equity method investments	1,749	952
Income before income taxes	30,006	27,166
Income tax expense (note 15)	(3,771)	(2,153)
Net income	26,235	25,013
Less: Net income attributable to non-controlling interests	8,928	4,633
Net income attributable to ACM Research, Inc.	17,307	20,380
Comprehensive income:
Net income	26,235	25,013
Foreign currency translation adjustment, net of tax of nil	27,797	1,750
Comprehensive income	54,032	26,763
Less: Comprehensive income attributable to non-controlling interests	16,167	4,957
Comprehensive income attributable to ACM Research, Inc.	$ 37,865	$ 21,806
Net income attributable to ACM Research, Inc. per share of common stock (note 2):
Basic (in dollars per share)	$ 0.26	$ 0.32
Diluted (in dollars per share)	$ 0.24	$ 0.30
Weighted average shares of common stock outstanding used in computing per share amounts (note 2):
Basic (in shares)	65,804,254	63,267,834
Diluted (in shares)	69,769,907	66,952,774

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

3 Months Ended

Mar. 31, 2026

Accounting Policies [Abstract]

Cash and Cash Equivalents

The following table presents cash and cash equivalents, according to jurisdiction as of March 31, 2026, and December 31, 2025:


	March 31, 2026		December 31, 2025
United States	$	111,269	$	107,184
Mainland China	310,700		228,777
China Hong Kong	447,027		421,104
Korea	2,006		241
Singapore	1,267		67
Total	$	872,269	$	757,373

Fair Value, by Balance Sheet Grouping

Assets and liabilities measured at fair value on a recurring basis:


	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
As of March 31, 2026:
Assets
Cash and cash equivalents	$	83,385	$	—	$	—	$	83,385
Short-term investments	34,662		—		—		34,662
Available-for-sale debt securities	—		—		9,853		9,853
	$	118,047	$	—	$	9,853	$	127,900

As of December 31, 2025:
Assets
Cash and cash equivalents	$	84,627	$	—	$	—	$	84,627
Short-term investments	35,524		—		—		35,524
Available-for-sale debt securities	—		—		9,703		9,703
	$	120,151	$	—	$	9,703	$	129,854

Basic and Diluted Net Income per Common Share

Basic and diluted net income per share of common stock are calculated as follows:


	Three Months Ended March 31,
	2026		2025
Numerator:
Net income	$	26,235	$	25,013
Less: Net income attributable to non-controlling interests	8,928		4,633
Net income available to common stockholders, basic	17,307		20,380
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	302		312
Net income available to common stockholders, diluted	$	17,005	$	20,068

Weighted average shares outstanding, basic	65,804,254		63,267,834
Effect of dilutive securities	3,965,653		3,684,940
Weighted average shares outstanding, diluted	69,769,907		66,952,774

Net income per share of common stock:
Basic	$	0.26	$	0.32
Diluted	$	0.24	$	0.30

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	3 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Mar. 31, 2026
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The Company’s condensed consolidated financial statements include the accounts of ACM and its subsidiaries. ACM’s subsidiaries are those entities in which ACM, directly or indirectly, controls a majority of the voting power. All significant intercompany transactions and balances have been eliminated upon consolidation. The accompanying condensed consolidated financial statements of the Company have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) for interim financial information and the rules and regulations of the Securities and Exchange Commission (the “SEC”) for reporting on Form 10-Q. Accordingly, they do not include all the information and footnotes required by GAAP for complete financial statements. The accompanying condensed consolidated financial statements should be read in conjunction with the historical consolidated financial statements of the Company for the year ended December 31, 2025 included in ACM’s 2025 Annual Report on Form 10-K. The accompanying condensed consolidated financial statements are unaudited. In the opinion of management, these unaudited condensed consolidated financial statements of the Company reflect all adjustments that are necessary for a fair presentation of the Company’s financial position and results of operations. Such adjustments are of a normal recurring nature, unless otherwise noted. The balance sheet as of March 31, 2026 and the results of operations for the three months ended March 31, 2026 are not necessarily indicative of the results to be expected for any future period.
Use of Estimates	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, stock-based compensation arrangements, uncertain tax positions, warranty liabilities, allowance for credit losses and inventory provision. Management evaluates these estimates and assumptions on a regular basis. Actual results could differ from those estimates and assumptions.
Cash and Cash Equivalents and Restricted Cash	Cash and Cash Equivalents Cash and cash equivalents consist of cash on hand, 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. Cash held in the U.S. exceeds the Federal Deposit Insurance Corporation insurance limits and is subject to risk of loss. No losses have been experienced to date. Cash amounts held 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 restrictions and limitations on its ability to transfer funds to ACM or among our other subsidiaries. However, cash held in mainland China does exceed applicable insurance limits and is subject to risk of loss, although no such losses have been experienced to date. Restricted Cash As of March 31, 2026, all of the Company's restricted cash was held by financial institutions located in mainland China, Hong Kong and South Korea, and mainly represents cash secured to guarantee delivery of tools.
Time Deposits	Time Deposits Time deposits are denominated in Chinese Renminbi (“RMB”) and U.S. dollars and 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 condensed consolidated financial statements based on their expected time of collection. They are also subject to the risk control regulatory standards described above upon maturity.
Financial Instruments	Financial Instruments The Company periodically invests in equity and debt 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 classifies 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. For equity investments that have a readily determinable fair value, the Company classifies 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 recorded in non-operating income or loss in the condensed consolidated statements of comprehensive income. The Company’s investments in debt securities have been classified as available-for-sale securities. The Company classifies its debt securities as either short-term or long-term based on each instrument’s underlying contractual maturity date. Unrealized gains and losses on debt securities classified as available-for-sale are recognized in accumulated other comprehensive income in the condensed consolidated balance sheets.
Fair Value Measurement	Fair Value Measurement The Company’s fair value measurements and hierarchy are consistent with those disclosed in the Company’s Annual Report on Form 10‑K for the year ended December 31, 2025. The Company’s financial instruments primarily include its cash, cash equivalents, restricted cash, and short term time deposits, short-term and long-term investments, other receivables, accounts receivable, 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 receivables, accounts payable, and short-term borrowings approximate their respective 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. The Company did not have any assets and liabilities measured at fair value on a non-recurring basis as of March 31, 2026 and 2025. Refer to note 9 for fair value information related to the Company’s outstanding long-term borrowings as of March 31, 2026 and December 31, 2025.
Basic and Diluted Net Income per Share of Common Stock	ACM Research is authorized to issue Class A and Class B common stock. The two classes of common stock are substantially identical in all material respects, except for voting rights. 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 condensed consolidated statements of comprehensive income and in the above computation of net income per share of common stock. ACM did not have any participating securities outstanding during the three months ended March 31, 2026 and 2025. Diluted net income per share of common stock reflects the potential dilution from securities, such as stock options that could share in ACM Research’s earnings. Certain potentially 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 the calculation of diluted net income per share in the periods presented where their inclusion would be anti-dilutive were 809 and 1,298,408 stock options for the three months ended March 31, 2026 and 2025, respectively.
Concentration of Credit Risk	Concentration of Credit Risk Financial instruments that potentially subject the Company to credit risk consist principally of cash and cash equivalents, restricted cash, 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 revenue and accounts receivable. •Revenue concentration. For the three months ended March 31, 2026 and 2025, three customers accounted for 45.9% and four customers accounted for 53.6% of revenue, respectively. •Accounts receivable concentration. As of March 31, 2026 and December 31, 2025, four customers accounted for 60.1% and four customers accounted for 62.2%, 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.
Recently Adopted Accounting Pronouncements and Recently issued accounting pronouncements not yet adopted	Recently Adopted Accounting Pronouncements In July 2025, the FASB issued Accounting Standards Update No. 2025-05 “Financial Instruments—Credit Losses (Topic 326)” or ASU 2025-05. The amendments in ASU 2025-05 permit entities to elect a practical expedient when estimating expected credit losses on accounts receivable and contract assets. Under this election, entities may assume that current conditions as of the balance sheet date do not change for the remaining life of accounts receivable and contract assets when developing forecasts as part of estimating expected credit losses. The Company adopted ASU 2025-05 effective January 1, 2026. The adoption did not have a material effect on the Company’s consolidated financial statements. Recently issued accounting pronouncements not yet adopted In December 2024, the FASB issued ASU 2024-03: Income Statement--Reporting Comprehensive Income--Expense Disaggregation Disclosures (Subtopic 220-40), which requires additional disclosures about specific types of expenses included in the expense captions presented on the face of the income statement as well as disclosures about selling expenses. In January 2025, the FASB issued ASU 2025-01, which clarifies the effective date of ASU 2024-03. ASU 2024-03 is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027. This ASU should be applied prospectively with the option to apply the standard retrospectively. The Company is currently evaluating the provisions of this ASU. In December 2025, the FASB issued ASU 2025-10 – Government Grants which establishes guidance on the recognition, measurement, and presentation of government grants received by business entities. The new guidance leverages the principles in the accounting framework for government assistance in International Accounting Standard 20 "Accounting for Government Grants and Disclosure of Government Assistance". This ASU is effective for interim reporting periods within annual reporting periods beginning after December 15, 2028 and interim reporting periods within those annual periods. This ASU may be applied prospectively or retrospectively to any or all periods presented and early adoption of this ASU is permitted. The Company is currently evaluating the provisions of this ASU.

RELATED PARTY BALANCES AND TRANSACTIONS

3 Months Ended

Mar. 31, 2026

RELATED PARTY BALANCES AND TRANSACTIONS

The following tables reflect related party transactions in the Company's condensed consolidated financial statements:


	March 31, 2026		December 31, 2025
Advances to related party
Ninebell	$	163	$	163
Shengyi	707		2,337
Total	$	870	$	2,500


	March 31, 2026		December 31, 2025
Accounts payable
Ninebell	$	19,288	$	20,353
Shengyi	12,503		11,707
Total	$	31,791	$	32,060


	Three Months Ended March 31,
Purchase of materials	2026		2025
Ninebell	$	16,701	$	8,812
Shengyi	3,442		1,904
Total	$	20,143	$	10,716


	Three Months Ended March 31,
Service fee charged by	2026		2025
Shengyi	$	50	$	273

- Definition

The entire disclosure for related party transactions. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-2

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-5

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-6

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477968/946-235-50-2

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(e))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479134/946-220-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/850/tableOfContent

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-6

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

+ Details

DESCRIPTION OF BUSINESS (Tables)

3 Months Ended

Mar. 31, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Direct or Indirect Interests of Subsidiaries

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

Effective interest held as at

Subsidiary

Place and date of incorporation

Principal Activities

March 31,
2026

December 31,
2025

ACM Research (Shanghai), Inc. ("ACM Shanghai")

Mainland China, May 2005

Principal operating subsidiary

73.6%

74.6%

ACM Research (Wuxi), Inc. ("ACM Wuxi")

Mainland China, July 2011

Sales and services

73.6%

74.6%

CleanChip Technologies Limited ("CleanChip")

Hong Kong, June 2017

Trading partner between ACM Shanghai and its customers

73.6%

74.6%

ACM Research Korea CO., LTD. ("ACM Korea")

Republic of Korea ("South Korea"), December 2017

Sales, marketing, R&D, production

73.6%

74.6%

ACM Research (Lingang), Inc. ("ACM Lingang")

Mainland China, March 2019

Management of production activities

73.6%

74.6%

ACM Research (CA), Inc. ("ACM California")

USA, April 2019

Procurement for ACM Shanghai

73.6%

74.6%

ACM Research (Cayman), Inc.

Cayman Islands, April 2019

Administrative function (inactive)

100.0%

ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")

Singapore, August 2021

Sales, marketing, business development

100.0%

ACM Research (Beijing), Inc. ("ACM Beijing")

Mainland China, February 2022

Sales and services

73.6%

74.6%

Hanguk ACM CO., LTD

South Korea, March 2022

Sales, services, business development

100.0%

Yusheng Micro Semiconductor (Shanghai) Co., Ltd.

Mainland China, June 2023

Business development

73.6%

74.6%

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

Mainland China, June 2023

Component development and production

53.8%

54.5%

ACM Research (Chengdu), Inc. ("ACM Chengdu")

Mainland China, December 2024

Sales and services

73.6%

74.6%

Shengyi Micro Semiconductor (Shanghai) Co., Ltd.

Mainland China, December 2024

Business development

62.5%

63.4%

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Common Stock Class A	Common Stock Class B	Common Stock Common Stock Class A	Common Stock Common Stock Class B	Additional Paid- in Capital	Retained Earnings	30514000	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests
Beginning balance (in shares) at Dec. 31, 2024				57,938,885	5,021,811
Beginning balance at Dec. 31, 2024	$ 1,095,906			$ 6	$ 1	$ 677,476	$ 260,000	$ 30,514	$ (63,372)	$ 191,281
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	25,013						20,380			4,633
Foreign currency translation adjustment, net of tax of nil	1,750								1,426	324
Exercise of stock options (in shares)				894,040
Exercise of stock options	22,729					14,413				8,316
Stock-based compensation	9,817					8,302				1,515
Sale of ACM Shanghai's shares, net of tax/ Capital contribution by non-controlling shareholder	138									138
Ending balance (in shares) at Mar. 31, 2025				58,832,925	5,021,811
Ending balance at Mar. 31, 2025	1,155,353			$ 6	$ 1	700,191	280,380	30,514	(61,946)	206,207
Beginning balance (in shares) at Dec. 31, 2025		60,590,017	5,021,811	60,590,017	5,021,811
Beginning balance at Dec. 31, 2025	1,930,509			$ 6	$ 1	1,115,504	350,428	34,164	(35,740)	466,146
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,235						17,307			8,928
Foreign currency translation adjustment, net of tax of nil	27,797								20,558	7,239
Conversion of Class B common stock to Class A common stock			1	30,003	(30,003)
Exercise of stock options (in shares)		603,044		603,044
Exercise of stock options	5,397					5,397
Stock-based compensation	5,621					4,678				943
Sale of ACM Shanghai's shares, net of tax/ Capital contribution by non-controlling shareholder	87,913					69,207				18,706
Ending balance (in shares) at Mar. 31, 2026		61,223,064	4,991,808	61,223,064	4,991,808
Ending balance at Mar. 31, 2026	$ 2,083,472			$ 6	$ 1	$ 1,194,786	$ 367,735	$ 34,164	$ (15,182)	$ 501,962

OTHER PAYABLES AND ACCRUED EXPENSES (Tables)

3 Months Ended

Mar. 31, 2026

Payables and Accruals [Abstract]

Other Payables and Accrued Expenses

At March 31, 2026 and December 31, 2025, other payables and accrued expenses consisted of the following:


	March 31, 2026		December 31, 2025
Accrued commissions	$	28,074	$	26,931
Accrued warranty	19,299		19,104
Accrued payroll	29,839		24,830
Accrued machine sales fees	13,104		13,341
Accrued Lingang construction fees	12,736		24,258
Individual income tax payable	17,797		19,552
Payable for investments	4,913		4,838
Advances from employees for option exercises (1)	12,139		—
Others	22,174		17,542
Total	$	160,075	$	150,396

Schedule of Product Warranty Liability

Changes in the Company’s accrued warranty were as follows:


	March 31,		March 31,
	2026		2025
Balance at beginning of period	$	19,104	$	12,710
Additions	3,314		2,534
Utilized	(3,119)		(2,002)
Balance at end of period	$	19,299	$	13,242

INCOME TAXES - Summary of Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025
Income Tax Disclosure [Abstract]
Total income tax expense	$ (3,771)	$ (2,153)
Effective tax rate	12.60%	7.90%

- Definition

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-4

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-21

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476153/220-40-55-14

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 270
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (i)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482964/270-10-50-1

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (ee)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-32

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 8: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-9

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.7)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 250
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483443/250-10-50-8

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-10

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-22

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-04(9))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Subparagraph (a)
-SubTopic 20
-Topic 740
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482659/740-20-45-2

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h))
-SubTopic 10
-Topic 235
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

SHORT-TERM BORROWINGS (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Short-Term Debt [Line Items]
Short-term borrowings (note 7)	$ 93,981	$ 74,041
Short-term debt, weighted average interest rate, at point in time	2.20%	2.50%
Borrowings From Bank Of China
Short-Term Debt [Line Items]
Short-term borrowings (note 7)	$ 14,459	$ 14,459

STOCK-BASED COMPENSATION - Narrative (Details) - Employee Share Option	3 Months Ended
	Mar. 31, 2026 shares
Share-Based Payment Arrangement, Employee
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Granted (in shares)	2,800
Cost not yet recognized (in years)	4 years
Share-Based Payment Arrangement, Nonemployee
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Cost not yet recognized (in years)	3 months

INCOME TAXES

3 Months Ended

Mar. 31, 2026

Income Tax Disclosure [Abstract]

INCOME TAXES

Income tax expense was as follows:


	Three Months Ended March 31,
	2026		2025
Total income tax expense	(3,771)		(2,153)
Effective tax rate	12.6	%	7.9	%

The Company’s effective tax rate differs from statutory rates of 21% for U.S. federal income tax purposes and 25% for Chinese income tax purposes due to the effects of the valuation allowance and certain permanent differences from book-tax differences, including stock based compensation, deemed dividend income under Subchapter F of the U.S. Internal Revenue Code of 1986, as amended (Subpart F), and net CFC tested income (NCTI) inclusions, and R&D super deduction. As a result, the Company recorded income tax expense of $3,771 and $2,153 during the three months ended March 31, 2026 and 2025, respectively. The increase in the Company's effective income tax rate for the three months ended March 31, 2026 compared to the same period of the prior year was primarily due to higher pretax income this quarter

and increase in certain discrete tax expenses.

Under the change in Section 174 made by the Tax Cuts and Jobs Act of 2017 which became effective on January 1, 2022, 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 results in a significant increase in the Company’s global intangible low-taxed income inclusion. The enactment of the OBBB Act, signed into law in July 2025, repeals the mandatory capitalization requirement for domestic R&D expenses for tax years beginning after December 31, 2025. However, the capitalization requirement for research activities conducted outside of the U.S remains unchanged.

The Company had total unrecognized tax benefits of $20,905 as of March 31, 2026 and December 31, 2025. If recognized, the net impact to the effective rate would be $20,770. The Company did not expect any reversal of unrecognized tax benefits in the next 12 months. The Company will recognize interest and penalties, when they occur, related to uncertain tax provisions as a component of tax expense. For the three months ended March 31, 2026 and 2025, $822 and $404 of interest and penalties was recognized, respectively.

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, 2021 and 2024, effective until December 31, 2026. ACM Lingang’s tax is expected to be exempt for the first two profitable years after net operating loss utilization and half of the statutory tax rate for the next three years.

- Definition

The entire disclosure for income tax.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477617/942-740-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480738/235-10-S50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 740
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478822/944-740-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 231
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482663/740-10-55-231

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12C
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12C

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-12B

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 270
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477891/740-270-50-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 6.I.5.Q1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-1

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480990/946-20-50-13

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(h)(2))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/740/tableOfContent

Reference 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-14

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 21
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-21

Reference 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 17
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-17

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479360/740-10-S99-2

Reference 17: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482603/740-30-50-2

+ Details