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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Income Taxes [Abstract]
Income tax expense	$ 1,886	$ 2,689	$ 19,129	$ 6,733
Capitalized contract cost, amortization period	15 years		15 years
Unrecognized tax benefits	$ 20,905		$ 20,905		$ 20,905
Unrecognized tax benefits that would impact effective tax rate	$ 20,770		20,770		$ 20,770
Interest or penalties			$ 2,466	$ 3,379
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

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Basic and Diluted Net Income per Common Share (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026 USD ($) class $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares	Sep. 30, 2026 USD ($) class $ / shares shares	Sep. 30, 2025 USD ($) $ / shares shares
Numerator:
Net income	$ 6,323	$ 46,398	$ 154,808	$ 107,681
Less: Net income attributable to non-controlling interests	4,779	10,509	46,973	21,652
Net income available to common stockholders, basic	1,544	35,889	107,835	86,029
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	104	503	914	884
Net income available to common stockholders, diluted	$ 1,440	$ 35,386	$ 106,921	$ 85,145
Weighted average shares outstanding, basic (in shares) \| shares	69,713,048	64,381,296	67,817,058	63,876,709
Effect of dilutive securities (in shares) \| shares	3,916,582	4,033,017	3,783,388	3,674,593
Weighted average shares outstanding, diluted (in shares) \| shares	73,629,630	68,414,313	71,600,446	67,551,302
Net income per share of common stock:
Basic (in dollars per share) \| $ / shares	$ 0.02	$ 0.56	$ 1.59	$ 1.35
Diluted (in dollars per share) \| $ / shares	$ 0.02	$ 0.52	$ 1.49	$ 1.26
Classes of common stock outstanding \| class	2		2
Incremental common shares attributable to dilutive effect of share-based payment arrangements (in shares) \| shares	100,612	655,861	109,620	1,218,503

REVENUE FROM CONTRACTS WITH CUSTOMERS

9 Months Ended

Sep. 30, 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 table presents disaggregated revenue information:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment	$	210,721	$	181,570	$	466,181	$	466,100
ECP (front-end and packaging), Furnace and Other Technologies	109,469		59,853		322,254		135,499
Advanced Packaging (excluding ECP), Services & Spares	47,497		27,737		103,434		55,280
Total revenue by product category	$	367,687	$	269,160	$	891,869	$	656,879

During the three and nine month periods ended September 30, 2026 and 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:


	September 30, 2026		December 31, 2025
Advances from customers	$	163,212	$	187,809
Deferred revenue	24,882		17,388
Total contract liabilities	$	188,094	$	205,197

Below are revenues recognized from amounts included in contract liabilities at the beginning of the period:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Revenue recognized from amounts included in contract liabilities at the beginning of the periods	$	13,474	$	20,200	$	155,224	$	140,441

- 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.

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

9 Months Ended

Sep. 30, 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 condensed consolidated balance sheet as of September 30, 2026 and the condensed consolidated results of operations for the three and nine months ended September 30, 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 September 30, 2026 and December 31, 2025:


	September 30, 2026		December 31, 2025
United States	$	337,898	$	107,184
Mainland China	98,973		228,777
China Hong Kong	443,389		421,104
South Korea	3,399		241
Singapore	1,275		67
Total	$	884,934	$	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 their 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 September 30, 2026 and 2025, cash payments from ACM Shanghai to ACM California for the procurement of goods and services were $100 and $7,500, respectively. For the nine months ended September 30, 2026 and 2025, cash payments from ACM Shanghai to ACM California for the procurement of goods and services were $3,549 and $13,683, 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 nine months ended September 30, 2026 and 2025, with the exception of sales and services-related transfer-pricing payments in the ordinary course of business, and dividends paid by ACM Shanghai to the stockholders of ACM Shanghai (including ACM Research), no transfers, or distributions have been made between ACM Research and its subsidiaries, including ACM Shanghai, or to holders of ACM Research Class A common stock.

For the nine months ended September 30, 2026 and 2025, ACM Shanghai paid $29,125 and $29,238, in dividends, net of taxes, to ACM Research, respectively. ACM Shanghai paid a cash dividend of $11,768 and $7,578 to the non-controlling interest shareholders in the nine months ended September 30, 2026 and 2025, respectively.

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 and cannot be withdrawn before maturity. These deposits are presented as short-

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 September 30, 2026 had interest rates of 1.20% to 3.91% and mature between November 2026 and June 2027.

Restricted Cash

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 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 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, short-term and long-term deposits, short-term and long-term investments, other receivables, accounts receivable, bills and 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, bills and 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 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 September 30, 2026:
Assets
Cash equivalents	$	310,877	$	—	$	—	$	310,877
Short-term investments	66,910		—		—		66,910
Available-for-sale debt securities	—		—		10,807		10,807
	$	377,787	$	—	$	10,807	$	388,594

As of December 31, 2025:
Assets
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

Refer to note 9 for fair value information related to the Company’s outstanding long-term borrowings as of September 30, 2026 and December 31, 2025. The Company did not have any assets and liabilities measured at fair value on a non-recurring basis as of September 30, 2026 and December 31, 2025.

Bills payable

Bills payable represent trade payable due to the suppliers, for which the banks have guaranteed the payment. Bills payable are typically with terms of 6 months. Bills payable amounted to $20,747 and nil as of September 30, 2026 and December 31, 2025, respectively and are included in bills and accounts payable in the condensed consolidated balance sheets.

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 September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Numerator:
Net income	$	6,323	$	46,398	$	154,808	$	107,681
Less: Net income attributable to non-controlling interests	4,779		10,509		46,973		21,652
Net income available to common stockholders, basic	1,544		35,889		107,835		86,029
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	104		503		914		884
Net income available to common stockholders, diluted	$	1,440	$	35,386	$	106,921	$	85,145

Weighted average shares outstanding, basic	69,713,048		64,381,296		67,817,058		63,876,709
Effect of dilutive securities	3,916,582		4,033,017		3,783,388		3,674,593
Weighted average shares outstanding, diluted	73,629,630		68,414,313		71,600,446		67,551,302

Net income per share of common stock:
Basic	$	0.02	$	0.56	$	1.59	$	1.35
Diluted	$	0.02	$	0.52	$	1.49	$	1.26

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 and nine months ended September 30, 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 stock options exercisable into shares of the Company’s common stock of 100,612 and 109,620 for the three and nine months ended September 30, 2026, respectively and 655,861 and 1,218,503 for the three and nine months ended September 30, 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 September 30, 2026 and 2025, two customers accounted for 37.3% and 38.9% of revenue, respectively. For the nine months ended September 30, 2026 and 2025, two customers accounted for 28.0% and three customers accounted for 46.3% of revenue, respectively.

•Accounts receivable concentration. As of September 30, 2026 and December 31, 2025, five customers accounted for 60.8% 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 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 - Schedule of Long Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Long-Term Investments [Line Items]
Equity method investments	$ 59,295	$ 46,218
Equity investments without readily determinable fair value using the measurement alternative	11,297	10,114
Available for sale debt securities	10,807	9,703
Total long-term investments	81,399	66,035
Ninebell Co., Ltd. ("Ninebell")
Long-Term Investments [Line Items]
Equity method investments	44,783	31,310
Wooil Flucon Co., ("Wooil")
Long-Term Investments [Line Items]
Equity method investments	929	893
Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")
Long-Term Investments [Line Items]
Equity method investments	6,787	4,411
Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) ("Hefiei Shixi")
Long-Term Investments [Line Items]
Equity method investments	2,341	5,335
Company A
Long-Term Investments [Line Items]
Equity method investments	$ 4,455	$ 4,269

STOCK-BASED COMPENSATION - Schedule of Assumptions Used to Determine Fair Value of Share Options Granted (Details) - $ / shares	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
2026 Subsidiary Stock Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of share of common stock (in dollars per share)	$ 41.45
Volatility minimum	53.97%
Volatility maximum	70.69%
Risk-free interest rate minimum	1.16%
Risk-free interest rate maximum	1.33%
Expected dividend	0.00%
Employee Share Option \| 2016 Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Volatility minimum	84.24%	82.78%
Volatility maximum	86.14%	83.28%
Risk-free interest rate minimum	3.92%	4.03%
Risk-free interest rate maximum	4.52%	4.25%
Expected dividend	0.00%	0.00%
Minimum \| 2026 Subsidiary Stock Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term in years	1 year 6 months
Minimum \| Employee Share Option \| 2016 Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of share of common stock (in dollars per share)	$ 48.31	$ 24.33
Expected term in years	5 years 6 months	5 years 6 months
Maximum \| 2026 Subsidiary Stock Option Plan
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Expected term in years	4 years 6 months
Maximum \| Employee Share Option \| 2016 Omnibus Incentive Plan
Share-Based Compensation Arrangement by Share-Based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of share of common stock (in dollars per share)	$ 81.26	$ 29.18
Expected term in years	6 years 3 months	6 years 3 months

STATUTORY SURPLUS RESERVE (Details) - USD ($) $ in Thousands	Sep. 30, 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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Two Customers \| Revenue Benchmark
Concentration of Credit Risk [Abstract]
Concentration risk, percentage	37.30%	38.90%	28.00%
Three Customers \| Revenue Benchmark
Concentration of Credit Risk [Abstract]
Concentration risk, percentage				46.30%
Five Customers \| Accounts Receivable
Concentration of Credit Risk [Abstract]
Concentration risk, percentage			60.80%
Four Customers \| Accounts Receivable
Concentration of Credit Risk [Abstract]
Concentration risk, percentage					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

OTHER PAYABLES AND ACCRUED EXPENSES

9 Months Ended

Sep. 30, 2026

Payables and Accruals [Abstract]

OTHER PAYABLES AND ACCRUED EXPENSES

At September 30, 2026 and December 31, 2025, other payables and accrued expenses consisted of the following:


	September 30, 2026		December 31, 2025
Accrued commissions	$	34,479	$	26,931
Accrued warranty	26,191		19,104
Accrued payroll	27,697		24,830
Accrued machine sales fees	24,309		13,341
Accrued Lingang construction fees	17,365		24,258
Accrued payroll taxes	62,582		19,552
Payable for investments	1,040		4,838
Others	19,897		17,542
Total	$	213,560	$	150,396

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:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Balance at beginning of period	$	22,938	$	13,544	$	19,104	$	12,710
Additions	5,596		3,973		13,324		9,679
Utilized	(2,343)		(228)		(6,237)		(5,100)
Balance at end of period	$	26,191	$	17,289	$	26,191	$	17,289

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2026 shares
Charles Pappis [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On August 17, 2026, Charles Pappis, Board Member of ACM Research, Inc., adopted a Rule 10b5-1 trading arrangement (the “Pappis Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Pappis Plan allows for the contemporaneous exercise of options and sale of up to 20,000 shares of Class A Common Stock, at specific market prices, commencing on November 16, 2026, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) August 17, 2027, or (iii) such date that the Pappis Plan is otherwise terminated according to its terms, whichever comes first.
Name	Charles Pappis
Title	Board Member of ACM Research, Inc.
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	August 17, 2026
Expiration Date	August 17, 2027
Arrangement Duration	274 days
Aggregate Available	20,000
Tracy Liu [Member]
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	On September 4, 2026, Tracy Liu, Board Member of ACM Research, Inc. adopted a Rule 10b5-1 trading arrangement (the “Liu Plan”) that is intended to satisfy the affirmative defense of Rule 10b5-1(c) of the Exchange Act. The Liu Plan allows for the contemporaneous exercise of options and sale of up to 19,500 shares of Class A Common Stock, at specific market prices, commencing on January 4, 2027, and continuing until (i) all such options are exercised and the underlying shares are sold, (ii) December 31, 2027, or (iii) such date that the Liu Plan is otherwise terminated according to its terms, whichever comes first.
Name	Tracy Liu
Title	Board Member of ACM Research, Inc.
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	September 4, 2026
Expiration Date	December 31, 2027
Arrangement Duration	361 days
Aggregate Available	19,500

ACCOUNTS RECEIVABLE, NET (Tables)

9 Months Ended

Sep. 30, 2026

Receivables [Abstract]

Schedule of Accounts Receivable

At September 30, 2026 and December 31, 2025, accounts receivable consisted of the following:


	September 30, 2026		December 31, 2025
Accounts receivable	$	746,665	$	537,095
Less: Allowance for credit losses	(41,979)		(32,845)
Total accounts receivable, net	$	704,686	$	504,250

The movement of the allowance for credit losses for the nine months ended September 30, 2026 and 2025 was as follows:


	September 30, 2026		September 30, 2025
Allowance for credit losses at beginning of the year	$	(32,845)	$	(18,347)
Provision for credit losses	(9,134)		(9,481)
Allowance for credit losses at the end of the period	$	(41,979)	$	(27,828)

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 884,934		$ 884,934		$ 757,373
Payments of dividends			29,125	$ 29,238
Payments of dividends to noncontrolling interest			11,768	7,578
ACM Shanghai
Cash and Cash Equivalent [Abstract]
Cash payments for procurement of goods and services	100	$ 7,500	3,549	$ 13,683
United States
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	337,898		337,898		107,184
Mainland China
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	98,973		98,973		228,777
China Hong Kong
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	443,389		443,389		421,104
South Korea
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	3,399		3,399		241
Singapore
Cash and Cash Equivalent [Abstract]
Cash, cash equivalents and restricted cash and time deposits	$ 1,275		$ 1,275		$ 67

LONG-TERM INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2026

Long-Term Investments [Abstract]

Schedule of Long-Term Investment

The Company’s long-term investment balance primarily consisted of the following:


Equity investee:	September 30, 2026		December 31, 2025
Ninebell Co., Ltd. ("Ninebell")	$	44,783	$	31,310
Wooil Flucon Co., ("Wooil")	929		893
Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")	6,787		4,411
Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) ("Hefiei Shixi")	2,341		5,335
Company A	4,455		4,269
Subtotal	59,295		46,218
Equity investments without readily determinable fair value using the measurement alternative	11,297		10,114
Available for sale debt securities	10,807		9,703
Total long-term investments	$	81,399	$	66,035

Schedule of 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 September 30, 2026 and December 31, 2025:


	September 30, 2026		December 31, 2025
Amortized Cost	$	7,585	$	7,269
Estimated fair value	10,807		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 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-3

Reference 2: 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 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)

9 Months Ended

Sep. 30, 2026

Segment Reporting [Abstract]

Schedule of Long-Lived Assets by Geography

Long-lived assets by geographic region were as follows:


	September 30, 2026		December 31, 2025
Long-lived assets by geography:
Mainland China	$	413,797	$	321,748
South Korea	7,202		8,868
United States	18,985		9,465
Total	$	439,984	$	340,081

RELATED PARTY BALANCES AND TRANSACTIONS (Tables)

9 Months Ended

Sep. 30, 2026


Advances to related parties	September 30, 2026		December 31, 2025
Ninebell	$	163	$	163
Shengyi	34		2,337
Total	$	197	$	2,500


Accounts payable	September 30, 2026		December 31, 2025
Ninebell	$	20,449	$	20,353
Shengyi	13,325		11,707
Total	$	33,774	$	32,060


	Three Months Ended September 30,				Nine Months Ended September 30,
Purchases of materials	2026		2025		2026		2025
Ninebell	$	23,696	$	17,839	$	61,468	$	44,852
Shengyi	7,157		5,541		14,496		11,527
Total	$	30,853	$	23,380	$	75,964	$	56,379


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Service fee charged by
Shengyi	$	310	$	291	$	626	$	2,190

Rental fee charged to
Ninebell	$	38	$	—	$	85	$	—

SHORT-TERM INVESTMENTS (Tables)

9 Months Ended

Sep. 30, 2026

Investments, Debt and Equity Securities [Abstract]

Schedule of Components of Trading Securities

At September 30, 2026 and December 31, 2025, the components of short-term investments were as follows:


	September 30, 2026		December 31, 2025
Short-term investments listed in Shanghai Stock Exchange
Cost	$	17,820	$	17,076
Market value	66,910		35,524

Schedule of Unrealized Gain (Loss) on Trading Securities

For the three and nine months ended September 30, 2026 and 2025, the net gains recognized on equity securities were as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Unrealized (loss) gain recognized on short-term investments held at September 30,	$	(39,133)	$	18,656	$	29,053	$	20,304
Realized gain on short-term investments	28		—		28		54
Total (loss) gain recognized on short-term investments	$	(39,105)	$	18,656	$	29,081	$	20,358

ACCOUNTS RECEIVABLE, NET

9 Months Ended

Sep. 30, 2026

Receivables [Abstract]

ACCOUNTS RECEIVABLE, NET

At September 30, 2026 and December 31, 2025, accounts receivable consisted of the following:


	September 30, 2026		December 31, 2025
Accounts receivable	$	746,665	$	537,095
Less: Allowance for credit losses	(41,979)		(32,845)
Total accounts receivable, net	$	704,686	$	504,250

The Company assesses collectability by reviewing accounts receivable on a general basis where similar characteristics exist and on an individual basis when the Company identifies specific customers with known disputes or collectability issues. In determining the amount of the allowance for credit losses, the Company considers historical collectability based on past due status, the age of the accounts receivable balances, credit quality of the Company’s customers based on ongoing credit evaluations, and other factors that may affect the Company’s ability to collect from customers.

The movement of the allowance for credit losses for the nine months ended September 30, 2026 and 2025 was as follows:


	September 30, 2026		September 30, 2025
Allowance for credit losses at beginning of the year	$	(32,845)	$	(18,347)
Provision for credit losses	(9,134)		(9,481)
Allowance for credit losses at the end of the period	$	(41,979)	$	(27,828)

PROPERTY, PLANT AND EQUIPMENT, NET (Tables)

9 Months Ended

Sep. 30, 2026

Property, Plant, and Equipment [Abstract]

Schedule of Property, Plant, and Equipment

At September 30, 2026 and December 31, 2025, property, plant and equipment consisted of the following:


	September 30, 2026		December 31, 2025
Buildings and plants	$	283,125	$	229,731
Land	2,099		2,099
Manufacturing equipment	94,269		70,680
Office equipment	12,275		9,339
Transportation equipment	773		693
Leasehold improvement	14,667		12,656
Construction in progress	65,461		28,396
Total cost	472,669		353,594
Less: Accumulated depreciation	(58,190)		(38,764)
Total property, plant and equipment, net	$	414,479	$	314,830

DESCRIPTION OF BUSINESS - Schedule of Direct or Indirect Interests of Subsidiaries (Details)	Sep. 30, 2026	Jun. 30, 2026	Dec. 31, 2025
ACM Research (Shanghai), Inc. ("ACM Shanghai")
Description of Business [Abstract]
Effective interest held as at	72.80%	73.20%	74.60%
ACM Research (Wuxi), Inc. ("ACM Wuxi")
Description of Business [Abstract]
Effective interest held as at	72.80%		74.60%
CleanChip Technologies Limited ("CleanChip")
Description of Business [Abstract]
Effective interest held as at	72.80%		74.60%
ACM Research Korea CO., LTD. ("ACM Korea")
Description of Business [Abstract]
Effective interest held as at	72.80%		74.60%
ACM Research (Lingang), Inc. ("ACM Lingang")
Description of Business [Abstract]
Effective interest held as at	72.80%		74.60%
ACM Research (CA), Inc. ("ACM California")
Description of Business [Abstract]
Effective interest held as at	72.80%		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	72.80%		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	72.80%		74.60%
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.
Description of Business [Abstract]
Effective interest held as at	53.30%		54.50%
ACM Research (Chengdu), Inc. ("ACM Chengdu")
Description of Business [Abstract]
Effective interest held as at	72.80%		74.60%
Shengyi Micro Semiconductor (Shanghai) Co., Ltd.
Description of Business [Abstract]
Effective interest held as at	61.90%		63.40%

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Bills Payable (Details) - USD ($)	9 Months Ended
	Sep. 30, 2026	Dec. 31, 2025
Accounting Policies [Abstract]
Bills payable, term	6 months
Bills payable, current	$ 20,747,000	$ 0

REVENUE FROM CONTRACTS WITH CUSTOMERS (Tables)

9 Months Ended

Sep. 30, 2026

Revenue from Contract with Customer [Abstract]

Schedule of Disaggregated Revenue Information

The following table presents disaggregated revenue information:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment	$	210,721	$	181,570	$	466,181	$	466,100
ECP (front-end and packaging), Furnace and Other Technologies	109,469		59,853		322,254		135,499
Advanced Packaging (excluding ECP), Services & Spares	47,497		27,737		103,434		55,280
Total revenue by product category	$	367,687	$	269,160	$	891,869	$	656,879

Schedule of Accounts Receivables and Contract Liabilities

Below are the contract liabilities balances as of:


	September 30, 2026		December 31, 2025
Advances from customers	$	163,212	$	187,809
Deferred revenue	24,882		17,388
Total contract liabilities	$	188,094	$	205,197

Below are revenues recognized from amounts included in contract liabilities at the beginning of the period:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Revenue recognized from amounts included in contract liabilities at the beginning of the periods	$	13,474	$	20,200	$	155,224	$	140,441

LONG-TERM BORROWINGS - Schedule of Scheduled Principal Payments (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Principal Payments of Long-Term Loan [Abstract]
Remainder of 2026	$ 1,635
2027	87,393
2028	16,855
2029	47,512
2030 and thereafter	59,002
Long-term debt	$ 212,397	$ 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://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.9-06)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section S50
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-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef
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-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147481568/470-20-55-69C

Reference 12: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1D
-Subparagraph (b)
-Publisher FASB
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Reference 13: http://www.xbrl.org/2009/role/commonPracticeRef
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-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16)(a)(2))
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-Topic 470
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+ Details

SHORT-TERM INVESTMENTS - Schedule of Unrealized Gain (Loss) on Trading Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Investments, Debt and Equity Securities [Abstract]
Unrealized (loss) gain recognized on short-term investments held at September 30,	$ (39,133)	$ 18,656	$ 29,053	$ 20,304
Realized gain on short-term investments	28	0	28	54
Total (loss) gain recognized on short-term investments	$ (39,105)	$ 18,656	$ 29,081	$ 20,358

STATUTORY SURPLUS RESERVE	9 Months Ended
STATUTORY SURPLUS RESERVE	Sep. 30, 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 September 30, 2026 and December 31, 2025, and is presented as statutory surplus reserve on the Company’s condensed consolidated balance sheets.

INCOME TAXES (Tables)

9 Months Ended

Sep. 30, 2026

Income Tax Disclosure [Abstract]

Schedule of Income Tax Benefit (Expense)


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Total income tax expense	$	(1,886)	$	(2,689)	$	(19,129)	$	(6,733)

LONG-TERM INVESTMENTS - Schedule of Available-for-Sale Debt Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Long-Term Investments [Abstract]
Amortized Cost	$ 7,585	$ 7,269
Estimated fair value	$ 10,807	$ 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

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+ Details

REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Accounts Receivables and Contract Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Revenue from Contract with Customer [Abstract]
Advances from customers (note 3)	$ 163,212	$ 187,809
Deferred revenue (note 3)	24,882	17,388
Total contract liabilities	$ 188,094	$ 205,197

SHORT-TERM INVESTMENTS

9 Months Ended

Sep. 30, 2026

Investments, Debt and Equity Securities [Abstract]

SHORT-TERM INVESTMENTS

At September 30, 2026 and December 31, 2025, the components of short-term investments were as follows:


	September 30, 2026		December 31, 2025
Short-term investments listed in Shanghai Stock Exchange
Cost	$	17,820	$	17,076
Market value	66,910		35,524

For the three and nine months ended September 30, 2026 and 2025, the net gains recognized on equity securities were as follows:


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Unrealized (loss) gain recognized on short-term investments held at September 30,	$	(39,133)	$	18,656	$	29,053	$	20,304
Realized gain on short-term investments	28		—		28		54
Total (loss) gain recognized on short-term investments	$	(39,105)	$	18,656	$	29,081	$	20,358

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Time Deposits (Details)	9 Months Ended
	Sep. 30, 2026
Minimum
Deposit Assets [Line Items]
Time deposits, interest rate	1.20%
Maximum
Deposit Assets [Line Items]
Time deposits, interest rate	3.91%

OTHER PAYABLES AND ACCRUED EXPENSES - Schedule of Product Warranty Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Movement in Standard Product Warranty Accrual [Roll Forward]
Balance at beginning of period	$ 22,938	$ 13,544	$ 19,104	$ 12,710
Additions	5,596	3,973	13,324	9,679
Utilized	(2,343)	(228)	(6,237)	(5,100)
Balance at end of period	$ 26,191	$ 17,289	$ 26,191	$ 17,289

INVENTORIES, NET - Schedule of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Inventory Disclosure [Abstract]
Raw materials	$ 465,494	$ 349,663
Work-in-process	122,655	61,415
Finished goods	263,075	291,553
Total inventories, net	$ 851,224	$ 702,631

SHORT-TERM BORROWINGS (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Debt Disclosure [Abstract]
Short-term borrowings (note 7)	$ 130,746	$ 74,041
Short-term debt, weighted average interest rate, at point in time	2.10%	2.30%

- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References + Details

ACCOUNTS RECEIVABLE, NET - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Accounts Receivable [Abstract]
Accounts receivable	$ 746,665	$ 537,095
Less: Allowance for credit losses	(41,979)	(32,845)
Total accounts receivable, net	$ 704,686	$ 504,250

LONG-TERM INVESTMENTS

9 Months Ended

Sep. 30, 2026

Long-Term Investments [Abstract]

LONG-TERM INVESTMENTS

The Company’s long-term investment balance primarily consisted of the following:


Equity investee:	September 30, 2026		December 31, 2025
Ninebell Co., Ltd. ("Ninebell")	$	44,783	$	31,310
Wooil Flucon Co., ("Wooil")	929		893
Shengyi Semiconductor Technology Co., Ltd. ("Shengyi")	6,787		4,411
Hefei Shixi Chanheng Integrated Circuit Industry Venture Capital Fund Partnership (LP) ("Hefiei Shixi")	2,341		5,335
Company A	4,455		4,269
Subtotal	59,295		46,218
Equity investments without readily determinable fair value using the measurement alternative	11,297		10,114
Available for sale debt securities	10,807		9,703
Total long-term investments	$	81,399	$	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 September 30, 2026 and December 31, 2025:


	September 30, 2026		December 31, 2025
Amortized Cost	$	7,585	$	7,269
Estimated fair value	10,807		9,703

Cover Page - shares	9 Months Ended
Cover Page - shares	Sep. 30, 2026	Nov. 02, 2026
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 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	Q3
Class A Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		65,019,350
Class B Common Stock
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		4,991,808

REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Disaggregated Revenue Information [Abstract]
Revenues	$ 367,687	$ 269,160	$ 891,869	$ 656,879
Single Wafer Cleaning, Tahoe and Semi-Critical Cleaning Equipment
Disaggregated Revenue Information [Abstract]
Revenues	210,721	181,570	466,181	466,100
ECP (front-end and packaging), Furnace and Other Technologies
Disaggregated Revenue Information [Abstract]
Revenues	109,469	59,853	322,254	135,499
Advanced Packaging (excluding ECP), Services & Spares
Disaggregated Revenue Information [Abstract]
Revenues	$ 47,497	$ 27,737	$ 103,434	$ 55,280

- 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

+ Details

COMMON STOCK	9 Months Ended
COMMON STOCK	Sep. 30, 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. At September 30, 2026 and December 31, 2025, the number of shares of Class A common stock issued and outstanding was 64,876,605 and 60,590,017, respectively. At September 30, 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 505
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-Section S50
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+ Details

REVENUE FROM CONTRACTS WITH CUSTOMERS - Schedule of Revenues Recognized (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Revenue from Contract with Customer [Abstract]
Revenue recognized from amounts included in contract liabilities at the beginning of the periods	$ 13,474	$ 20,200	$ 155,224	$ 140,441

SEGMENT INFORMATION

9 Months Ended

Sep. 30, 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 development, 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 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 were as follows:


	September 30, 2026		December 31, 2025
Long-lived assets by geography:
Mainland China	$	413,797	$	321,748
South Korea	7,202		8,868
United States	18,985		9,465
Total	$	439,984	$	340,081

- Definition

The entire disclosure for segment reporting.

+ References

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+ Details

DESCRIPTION OF BUSINESS - Narrative (Details) $ / shares in Units, $ in Thousands			3 Months Ended		9 Months Ended
	May 15, 2026 USD ($) $ / shares shares	Feb. 06, 2026 USD ($) $ / shares shares	Sep. 30, 2026 shares	Jun. 30, 2026 shares	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Feb. 06, 2026 ¥ / shares	Dec. 31, 2025
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Line Items]
Number of shares issued in transaction (in shares) \| shares	2,900,000
Sale of stock, price per share (in USD per share) \| $ / shares	$ 52.00
Gross proceeds from sales of ACM Shanghai shares					$ 110,243	$ 0
Net proceeds received on sale of stock	$ 148,400
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 shares		$ 110,200
Proceeds from businesses and interest in affiliates, financing activities, net of tax		$ 86,000
Exercise of stock options (in shares) \| shares			2,669,625	2,431,900
Effective interest held as at			72.80%	73.20%	72.80%			74.60%

- Definition

Number of share options (or share units) exercised during the current period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Assets
Cash equivalents	$ 310,877	$ 84,627
Short-term investments	66,910	35,524
Available-for-sale debt securities	10,807	9,703
Total assets	388,594	129,854
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash equivalents	310,877	84,627
Short-term investments	66,910	35,524
Available-for-sale debt securities	0	0
Total assets	377,787	120,151
Significant Other Observable Inputs (Level 2)
Assets
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 equivalents	0	0
Short-term investments	0	0
Available-for-sale debt securities	10,807	9,703
Total assets	$ 10,807	$ 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

9 Months Ended

Sep. 30, 2026

Share-Based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

During the nine months ended September 30, 2026, the Company issued option grants for 80,000 shares and restricted stock unit ("RSU") grants of 29,620 shares to employees and board members under its 2016 Omnibus Incentive Plan. The share-based awards are accounted for as equity awards, are subject only to service vesting conditions, and vest over a period of 4 years for employees. The Company did not grant any non-employee stock options during the three and nine months ended September 30, 2026 under the 2016 Omnibus Incentive Plan.

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


	Nine Months Ended September 30, 2026	Nine Months Ended September 30, 2025
Fair value of share of common stock (1)	$48.31-$81.26	$24.33-$29.18
Expected term in years (2)	5.50-6.25	5.50-6.25
Volatility (3)	84.24%-86.14%	82.78%-83.28%
Risk-free interest rate (4)	3.92%-4.52%	4.03%-4.25%
Expected dividend (5)	—%	—%

(1)Fair value of Class A common stock value was the 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 nil as ACM has no history or expectation of paying a dividend on its Class A common stock.

ACM Shanghai 2026 Option Grants

In August 2026, ACM Shanghai adopted a 2026 Stock Option Incentive Plan (the "2026 Subsidiary Stock Option Plan") that provides for, among other incentives, the granting to officers, directors, employees of options to purchase shares of ACM Shanghai’s common stock. The vesting conditions consist of service periods conditions and performance conditions related to certain sales and research and development progress targets determined by the Board of Directors of ACM Shanghai.

During the nine months ended September 30, 2026, ACM Shanghai issued 2,010,620 option grants under the 2026 Subsidiary Stock Option Plan with a weighted average grant date fair value of $31.12.

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


			Nine Months Ended September 30, 2026
Fair value of common stock(1)			$41.45
Expected term in years (2)			1.50-4.50
Volatility (3)			53.97%-70.69%
Risk-free interest rate (4)			1.16%-1.33%
Expected dividend (5)			—%

(1)Fair value of common stock was the closing market price of ACM Shanghai's 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 Shanghai in the period equal to the expected term of each grant.

(4)Risk-free interest rate is based on the yields of RMB deposit in mainland China with maturities similar to the expected term of the share options in effect at the time of grant.

(5) Expected dividend is assumed to be 0% as the impact is adjusted on the value of share of common stock.

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 September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Stock-based compensation expense:
Cost of revenue	$	491	$	253	$	1,016	$	1,138
Sales and marketing expense	2,119		1,601		4,941		5,854
Research and development expense	4,195		1,915		7,569		7,270
General and administrative expense	3,897		3,793		9,380		12,887
Total stock-based compensation expense	$	10,702	$	7,562	$	22,906	$	27,149

INVENTORIES, NET (Tables)

9 Months Ended

Sep. 30, 2026

Inventory Disclosure [Abstract]

Schedule of Inventories

At September 30, 2026, and December 31, 2025, inventories consisted of the following:


	September 30, 2026		December 31, 2025
Raw materials	$	465,494	$	349,663
Work-in-process	122,655		61,415
Finished goods	263,075		291,553
Total inventories, net	$	851,224	$	702,631

PROPERTY, PLANT AND EQUIPMENT, NET

9 Months Ended

Sep. 30, 2026

Property, Plant, and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT, NET

At September 30, 2026 and December 31, 2025, property, plant and equipment consisted of the following:


	September 30, 2026		December 31, 2025
Buildings and plants	$	283,125	$	229,731
Land	2,099		2,099
Manufacturing equipment	94,269		70,680
Office equipment	12,275		9,339
Transportation equipment	773		693
Leasehold improvement	14,667		12,656
Construction in progress	65,461		28,396
Total cost	472,669		353,594
Less: Accumulated depreciation	(58,190)		(38,764)
Total property, plant and equipment, net	$	414,479	$	314,830

Depreciation expense for the three months ended September 30, 2026 and 2025 was $8,046 and $2,458, respectively. Depreciation expense for the nine months ended September 30, 2026 and 2025 was $19,426 and $8,362, respectively.

On June 5, 2026, the Company purchased a facility consisting of 3,196 square meters of general-purpose office space located in Shanghai Pudong New Area for RMB 312,699 ($45,904). To partially finance the purchase, the Company entered into a loan agreement with the Bank of China for RMB 231,518 ($34,380) at a 2.65% interest rate, with a repayment term of 120 months. The facility was pledged as security for a loan from the Bank of China in July 2026 (note 9).

At September 30, 2026, buildings and plants included $37,087 for the Lingang housing property, which are pledged as a security for loans from the China Merchants Bank (note 9).

- Definition

The entire disclosure for property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
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-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

SHORT-TERM INVESTMENTS - Schedule of Trading Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Investments, Debt and Equity Securities [Abstract]
Cost	$ 17,820	$ 17,076
Market value	$ 66,910	$ 35,524

ACCOUNTS RECEIVABLE, NET - Schedule of Allowance For Doubtful Accounts (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ (32,845)	$ (18,347)
Provision for credit losses	(9,134)	(9,481)
Ending balance	$ (41,979)	$ (27,828)

RELATED PARTY BALANCES AND TRANSACTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Related Party Transaction [Line Items]
Purchases of materials	$ 30,853	$ 23,380	$ 75,964	$ 56,379
Service fee charged by	215,275	156,011	497,601	356,719
Related Party
Related Party Transaction [Line Items]
Advances to related parties	197		197		$ 2,500
Bills and accounts payable (note 2)	33,774		33,774		32,060
Service fee charged by	26,678	19,293	58,730	45,209
Ninebell
Related Party Transaction [Line Items]
Purchases of materials	23,696	17,839	61,468	44,852
Ninebell \| Related Party
Related Party Transaction [Line Items]
Advances to related parties	163		163		163
Bills and accounts payable (note 2)	20,449		20,449		20,353
Ninebell \| Related Party \| Rental Fee Charged
Related Party Transaction [Line Items]
Rental fee charged to	38	0	85	0
Shengyi
Related Party Transaction [Line Items]
Purchases of materials	7,157	5,541	14,496	11,527
Shengyi \| Related Party
Related Party Transaction [Line Items]
Advances to related parties	34		34		2,337
Bills and accounts payable (note 2)	13,325		13,325		$ 11,707
Service fee charged by	$ 310	$ 291	$ 626	$ 2,190

INVENTORIES, NET - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025	Dec. 31, 2025
Inventory [Line Items]
Finished goods	$ 263,075		$ 263,075		$ 291,553
Inventory write-down	6,907	$ 4,228	18,927	$ 9,853
First-tools, Customer Ownership
Inventory [Line Items]
Finished goods	$ 83,050		$ 83,050		$ 145,506

PROPERTY, PLANT AND EQUIPMENT, NET - Schedule of Property, Plant, and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Property, Plant, and Equipment [Line Items]
Total cost	$ 472,669	$ 353,594
Less: Accumulated depreciation	(58,190)	(38,764)
Total property, plant and equipment, net	414,479	314,830
Buildings and plants
Property, Plant, and Equipment [Line Items]
Total cost	283,125	229,731
Land
Property, Plant, and Equipment [Line Items]
Total cost	2,099	2,099
Manufacturing equipment
Property, Plant, and Equipment [Line Items]
Total cost	94,269	70,680
Office equipment
Property, Plant, and Equipment [Line Items]
Total cost	12,275	9,339
Transportation equipment
Property, Plant, and Equipment [Line Items]
Total cost	773	693
Leasehold improvement
Property, Plant, and Equipment [Line Items]
Total cost	14,667	12,656
Construction in progress
Property, Plant, and Equipment [Line Items]
Total cost	$ 65,461	$ 28,396

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Current assets:
Cash and cash equivalents (note 2)	$ 884,934	$ 757,373
Restricted cash	21,512	8,589
Short-term time deposits (note 2)	370,296	366,591
Short-term investments (note 11)	66,910	35,524
Account receivables, net (note 4)	704,686	504,250
Inventories, net (note 5)	851,224	702,631
Prepaid expenses and other current assets	29,364	10,567
Total current assets	3,039,819	2,436,680
Property, plant and equipment, net (note 6)	414,479	314,830
Operating lease right-of-use assets, net	15,840	17,925
Intangible assets, net	3,060	2,847
Deferred tax assets (note 15)	30,912	29,389
Long-term investments (note 10)	81,399	66,035
Other long-term assets	6,605	4,479
Total assets	3,592,114	2,872,185
Current liabilities:
Short-term borrowings (note 7)	130,746	74,041
Current portion of long-term borrowings (note 9)	64,121	35,082
Advances from customers (note 3)	163,212	187,809
Deferred revenue (note 3)	24,882	17,388
Income taxes payable (note 15)	7,128	991
FIN-48 payable (note 15)	29,447	27,719
Other payables and accrued expenses (note 8)	213,560	150,396
Current portion of operating lease liabilities	4,970	4,786
Total current liabilities	961,148	745,712
Long-term borrowings (note 9)	148,276	178,930
Long-term operating lease liabilities	2,598	5,069
Other long-term liabilities	11,908	11,965
Total liabilities	1,123,930	941,676
Commitments and contingencies (note 16)
Stockholders’ equity:
Additional paid-in capital	1,377,577	1,115,504
Retained earnings	458,263	350,428
Statutory surplus reserve (note 18)	34,164	34,164
Accumulated other comprehensive income (loss)	25,916	(35,740)
Total ACM Research, Inc. stockholders’ equity	1,895,927	1,464,363
Non-controlling interests	572,257	466,146
Total equity	2,468,184	1,930,509
Total liabilities and equity	3,592,114	2,872,185
Class A Common Stock
Stockholders’ equity:
Common stock	6	6
Class B Common Stock
Stockholders’ equity:
Common stock	1	1
Nonrelated Party
Current assets:
Other receivables	110,696	48,655
Current liabilities:
Bills and accounts payable (note 2)	289,308	215,440
Related Party
Current assets:
Other receivables	197	2,500
Current liabilities:
Bills and accounts payable (note 2)	$ 33,774	$ 32,060

OTHER PAYABLES AND ACCRUED EXPENSES - Schedule of Other Payables and Accrued Expenses (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Payables and Accruals [Abstract]
Accrued commissions	$ 34,479	$ 26,931
Accrued warranty	26,191	19,104
Accrued payroll	27,697	24,830
Accrued machine sales fees	24,309	13,341
Accrued Lingang construction fees	17,365	24,258
Accrued payroll taxes	62,582	19,552
Payable for investments	1,040	4,838
Others	19,897	17,542
Total	$ 213,560	$ 150,396

STOCK-BASED COMPENSATION - Narrative (Details) - $ / shares	3 Months Ended	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2026
2026 Subsidiary Stock Option Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Options granted (in shares)		2,010,620
Granted (in dollars per share)		$ 31.12
Share-Based Payment Arrangement, Employee \| 2016 Omnibus Incentive Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Options granted (in shares)		80,000
Share-Based Payment Arrangement, Employee \| Restricted Stock Units (RSUs) \| 2016 Omnibus Incentive Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Equity instruments other than options granted (in shares)		29,620
Share-Based Payment Arrangement, Employee \| Employee Share Option \| 2016 Omnibus Incentive Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Cost not yet recognized (in years)		4 years
Share-Based Payment Arrangement, Nonemployee \| 2016 Omnibus Incentive Plan
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Options granted (in shares)	0	0

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Statement [Line Items]
Cost of revenue, related party	$ 215,275	$ 156,011	$ 497,601	$ 356,719
Other comprehensive income (loss), foreign currency translation adjustment, tax	0	0	0	0
Related Party
Statement [Line Items]
Cost of revenue, related party	$ 26,678	$ 19,293	$ 58,730	$ 45,209

- Definition

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

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- 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.

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+ Details

LONG-TERM BORROWINGS

9 Months Ended

Sep. 30, 2026

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

LONG-TERM BORROWINGS

At September 30, 2026 and December 31, 2025, long-term borrowings consisted of loan facilities from the following financial institutions:


`	September 30,		December 31,
	2026		2025
China Merchants Bank	$	25,803	$	9,915
Agricultural Bank of China	43,091		42,007
Bank of China	69,546		34,247
China CITIC Bank	—		28,460
China Everbright Bank	26,961		56,807
Industrial and Commercial Bank of China	46,996		42,576
Total borrowings	212,397		214,012
Less: Current portion	(64,121)		(35,082)
Total long-term borrowings, net of current portion	$	148,276	$	178,930

China Merchants Bank

In January 2026, ACM Shanghai entered into a long-term loan facility, of $17,820 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

In May 2026, ACM Shanghai entered into a long-term loan facility of $34,380 from Bank of China for the purchase of new office located in Shanghai’s Pudong New Area (note 6). The loan will be paid in 120 monthly installments. The loan bears interest at an annual rate of 2.65%.

In 2025, ACM Shanghai secured a long-term loan of $5,940 with the Bank of China for ACM Shanghai’s project expenditures. The facility requires 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.

Industrial and Commercial Bank of China

In March 2026, ACM Shanghai entered into a long-term loan facility of $24,868. 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 information

As of September 30, 2026 and December 31, 2025, the total carrying amount of long-term loans was $212,397 and $214,012, compared with an estimated fair value of $193,251 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 September 30, 2026 are as follows:


Year ending December 31,
Remainder of 2026	$	1,635
2027	87,393
2028	16,855
2029	47,512
2030 and thereafter	59,002
	$	212,397

COMMITMENTS AND CONTINGENCIES (Details) - 9 months ended Sep. 30, 2026 ¥ in Thousands, $ in Thousands	USD ($) legalProceeding	CNY (¥)
Commitments and Contingencies Disclosure [Abstract]
Contractual obligation \| $	$ 9,500
Annual total taxes, percentage	80.00%
Annual total taxes	$ 22,800	¥ 157,600
Number of outstanding legal proceedings \| legalProceeding	0

SHORT-TERM BORROWINGS	9 Months Ended
SHORT-TERM BORROWINGS	Sep. 30, 2026
Debt Disclosure [Abstract]
SHORT-TERM BORROWINGS	SHORT-TERM BORROWINGS Short-term borrowings as of September 30, 2026 and December 31, 2025 amounted to $130,746 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 September 30, 2026 and December 31, 2025, the weighted average interest rates for the outstanding borrowings were 2.1% and 2.3%, respectively.

COMMITMENTS AND CONTINGENCIES	9 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2026
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES As of September 30, 2026, the Company had $9,500 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), as amended, 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, by December 12, 2029, 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. 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, liability for breach of contract. 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 damages that cannot reasonably be estimated. The Company’s management has evaluated all proceedings and claims that existed as of September 30, 2026. In the opinion of management, no additional provision for liability nor disclosure was required as of September 30, 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 September 30, 2026, the Company had no material outstanding legal proceedings.

LONG-TERM BORROWINGS - Narrative (Details) ¥ in Thousands, $ in Thousands	1 Months Ended			12 Months Ended
	May 31, 2026 USD ($) installment	Mar. 31, 2026 USD ($) installment	Jan. 31, 2026 USD ($) installment	Dec. 31, 2025 USD ($)	Sep. 30, 2026 USD ($)	May 31, 2026 CNY (¥)
Line of Credit Facility [Line Items]
Long-term debt				$ 214,012	$ 212,397
Long-term debt, fair value				202,706	193,251
China Merchants Bank
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity			$ 17,820
Number of installments for loan repayable \| installment			6
Line of credit facility, interest rate during period			2.38%
Long-term debt				9,915	25,803
Bank of China
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity	$ 34,380			$ 5,940		¥ 231,518
Number of installments for loan repayable \| installment	120
Line of credit facility, interest rate during period	2.65%
Interest-bearing debt ratio				5
Long-term debt				$ 34,247	69,546
Industrial and Commercial Bank of China
Line of Credit Facility [Line Items]
Line of credit facility, maximum borrowing capacity		$ 24,868
Number of installments for loan repayable \| installment		6
Line of credit facility, interest rate during period		2.29%
Long-term debt				$ 42,576	$ 46,996

STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2026

Share-Based Payment Arrangement [Abstract]

Schedule of 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 model with the following assumptions:


	Nine Months Ended September 30, 2026	Nine Months Ended September 30, 2025
Fair value of share of common stock (1)	$48.31-$81.26	$24.33-$29.18
Expected term in years (2)	5.50-6.25	5.50-6.25
Volatility (3)	84.24%-86.14%	82.78%-83.28%
Risk-free interest rate (4)	3.92%-4.52%	4.03%-4.25%
Expected dividend (5)	—%	—%

(1)Fair value of Class A common stock value was the 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 nil as ACM has no history or expectation of paying a dividend on its Class A common stock.

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


			Nine Months Ended September 30, 2026
Fair value of common stock(1)			$41.45
Expected term in years (2)			1.50-4.50
Volatility (3)			53.97%-70.69%
Risk-free interest rate (4)			1.16%-1.33%
Expected dividend (5)			—%

(1)Fair value of common stock was the closing market price of ACM Shanghai's 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 Shanghai in the period equal to the expected term of each grant.

(4)Risk-free interest rate is based on the yields of RMB deposit in mainland China with maturities similar to the expected term of the share options in effect at the time of grant.

(5) Expected dividend is assumed to be 0% as the impact is adjusted on the value of share of common stock.

Schedule 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 September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Stock-based compensation expense:
Cost of revenue	$	491	$	253	$	1,016	$	1,138
Sales and marketing expense	2,119		1,601		4,941		5,854
Research and development expense	4,195		1,915		7,569		7,270
General and administrative expense	3,897		3,793		9,380		12,887
Total stock-based compensation expense	$	10,702	$	7,562	$	22,906	$	27,149

LONG-TERM BORROWINGS (Tables)

9 Months Ended

Sep. 30, 2026

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

Schedule of Long-Term Borrowings

At September 30, 2026 and December 31, 2025, long-term borrowings consisted of loan facilities from the following financial institutions:


`	September 30,		December 31,
	2026		2025
China Merchants Bank	$	25,803	$	9,915
Agricultural Bank of China	43,091		42,007
Bank of China	69,546		34,247
China CITIC Bank	—		28,460
China Everbright Bank	26,961		56,807
Industrial and Commercial Bank of China	46,996		42,576
Total borrowings	212,397		214,012
Less: Current portion	(64,121)		(35,082)
Total long-term borrowings, net of current portion	$	148,276	$	178,930

Schedule of Principal Payments for Outstanding Long-Term Loan

Scheduled principal payments for the outstanding long-term loans, including the current portion, as of September 30, 2026 are as follows:


Year ending December 31,
Remainder of 2026	$	1,635
2027	87,393
2028	16,855
2029	47,512
2030 and thereafter	59,002
	$	212,397

- 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://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 235
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.9-06)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477314/942-235-S99-2

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-3

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

Reference 4: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-7

Reference 5: http://fasb.org/us-gaap/role/ref/otherTransitionRef
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-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481112/505-10-50-6

Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480657/210-10-S50-9

Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(a))
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Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22)(b))
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-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 9: 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 10: 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 11: 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 12: 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 13: 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 14: 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

+ Details

SEGMENT INFORMATION (Details) $ in Thousands	9 Months Ended
SEGMENT INFORMATION (Details) $ in Thousands	Sep. 30, 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]
Total	$ 439,984	$ 340,081
Mainland China
Geographic Areas, Long-Lived Assets [Abstract]
Total	413,797	321,748
South Korea
Geographic Areas, Long-Lived Assets [Abstract]
Total	7,202	8,868
United States
Geographic Areas, Long-Lived Assets [Abstract]
Total	$ 18,985	$ 9,465

LONG-TERM BORROWINGS - Schedule of Long-term Borrowings (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Long-Term Borrowings [Abstract]
Long-term debt	$ 212,397	$ 214,012
Less: Current portion	(64,121)	(35,082)
Total long-term borrowings, net of current portion	148,276	178,930
China Merchants Bank
Long-Term Borrowings [Abstract]
Long-term debt	25,803	9,915
Agricultural Bank of China
Long-Term Borrowings [Abstract]
Long-term debt	43,091	42,007
Bank of China
Long-Term Borrowings [Abstract]
Long-term debt	69,546	34,247
China CITIC Bank
Long-Term Borrowings [Abstract]
Long-term debt	0	28,460
China Everbright Bank
Long-Term Borrowings [Abstract]
Long-term debt	26,961	56,807
Industrial and Commercial Bank of China
Long-Term Borrowings [Abstract]
Long-term debt	$ 46,996	$ 42,576

INVENTORIES, NET

9 Months Ended

Sep. 30, 2026

Inventory Disclosure [Abstract]

INVENTORIES, NET

At September 30, 2026, and December 31, 2025, inventories consisted of the following:


	September 30, 2026		December 31, 2025
Raw materials	$	465,494	$	349,663
Work-in-process	122,655		61,415
Finished goods	263,075		291,553
Total inventories, net	$	851,224	$	702,631

At September 30, 2026 and December 31, 2025, the value of finished goods inventory at customers' physical locations for which customers were contractually obligated to take ownership upon acceptance totaled $83,050 and $145,506, respectively.

During the three months ended September 30, 2026 and 2025, the provisions for inventory recognized in cost of revenues were $6,907 and $4,228, respectively. During the nine months ended September 30, 2026 and 2025, the provisions for inventory recognized in cost of revenues were $18,927 and $9,853, respectively.

DESCRIPTION OF BUSINESS

9 Months Ended

Sep. 30, 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
Subsidiaries	Place and date of incorporation	Principal Activities	September 30, 2026		December 31, 2025
ACM Research (Shanghai), Inc. ("ACM Shanghai")	Mainland China, May 2005	Principal operating subsidiary	72.8	%	74.6	%
ACM Research (Wuxi), Inc. ("ACM Wuxi")	Mainland China, July 2011	Sales and services	72.8	%	74.6	%
CleanChip Technologies Limited ("CleanChip")	Hong Kong, June 2017	Trading partner between ACM Shanghai and its customers	72.8	%	74.6	%
ACM Research Korea CO., LTD. ("ACM Korea")	Republic of Korea ("South Korea"), December 2017	Sales, marketing, R&D, production	72.8	%	74.6	%
ACM Research (Lingang), Inc. ("ACM Lingang")	Mainland China, March 2019	Management of production activities	72.8	%	74.6	%
ACM Research (CA), Inc. ("ACM California")	USA, April 2019	Procurement for ACM Shanghai	72.8	%	74.6	%
ACM Research (Cayman), Inc.	Cayman Islands, April 2019	Administrative function (inactive)	100.0	%	100.0	%
ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")	Singapore, August 2021	Sales, marketing, business development	100.0	%	100.0	%
ACM Research (Beijing), Inc. ("ACM Beijing")	Mainland China, February 2022	Sales and services	72.8	%	74.6	%
Hanguk ACM CO., LTD	South Korea, March 2022	Sales, services, business development	100.0	%	100.0	%
Yusheng Micro Semiconductor (Shanghai) Co., Ltd.	Mainland China, June 2023	Component development and production	72.8	%	74.6	%
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.	Mainland China, June 2023	Component development and production	53.3	%	54.5	%
ACM Research (Chengdu), Inc. ("ACM Chengdu")	Mainland China, December 2024	Sales and services	72.8	%	74.6	%
Shengyi Micro Semiconductor (Shanghai) Co., Ltd.	Mainland China, December 2024	Business development	61.9	%	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 $86.0 million net of taxes. During the three months ended June 30, 2026, ACM Shanghai's employees exercised 2,431,900 options for shares of ACM Shanghai. During three months ended September 30, 2026, ACM Shanghai's employees exercised 2,669,625 options for shares of

ACM Shanghai. Following the transactions, ACM’s ownership percentage in ACM Shanghai decreased from 73.2% as of June 30, 2026 to 72.8% as of September 30, 2026.

On May 15, 2026, ACM completed the sale of approximately 2.9 million of its shares to certain investors at a price of $52.00 per share, generating approximately $148.4 million of proceeds, net of issuance costs.

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Cash flows from operating activities:
Net income	$ 154,808	$ 107,681
Adjustments to reconcile net income to net cash used in operating activities:
Non-cash operating lease cost	3,699	3,338
Depreciation and amortization	18,736	10,460
Income from equity method investments	(15,706)	(6,395)
Unrealized gain on short-term investments	(29,053)	(20,304)
Inventory provision	18,927	9,853
Provision for credit losses	9,134	9,481
Deferred income taxes	(460)	(11,713)
Stock-based compensation	22,906	27,149
Dividends from unconsolidated affiliates	4,353	64
Others	0	1,092
Net changes in operating assets and liabilities:
Accounts receivable	(161,610)	(91,349)
Other receivables	(48,122)	(6,041)
Inventories	(135,162)	(80,689)
Advances to related parties	2,303	97
Prepaid expenses and other current assets	(16,092)	(7,271)
Other long-term assets	(1,710)	(889)
Related parties accounts payable	1,714	7,190
Bills and accounts payable	51,115	37,354
Advances from customers	(31,113)	(43,254)
Deferred revenue	7,494	7,012
Income taxes payable	(16,421)	(12,934)
FIN-48 payable	1,728	2,302
Other payables and accrued expenses	56,150	17,713
Operating lease liabilities	(3,900)	(3,296)
Other long-term liabilities	(57)	(895)
Net cash used in operating activities	(106,339)	(44,244)
Cash flows from investing activities:
Purchases of property and equipment	(112,485)	(42,473)
Purchase of intangible assets	(1,412)	(780)
Purchase of time deposits	(25,000)	(37,000)
Proceeds from redemption and maturity of time deposits	38,005	37,261
Refund of deposit for land use right	0	686
Purchase of long-term investments	(4,698)	(478)
Net cash used in investing activities	(105,590)	(42,784)
Cash flows from financing activities:
Proceeds from short-term borrowings	129,032	59,450
Repayments of short-term borrowings	(76,230)	(47,648)
Proceeds from long-term borrowings	75,525	119,651
Repayments of long-term borrowings	(86,850)	(29,871)
Capital contribution by non-controlling shareholder	138	242
Proceeds from exercise of stock options	51,386	27,893
Gross proceeds from sales of ACM Shanghai shares	110,243	0
Net proceeds from issuance of ACM Shanghai shares	0	622,964
Proceeds from Issuance of ACM Research shares, net of issuance costs	148,389	0
Repurchase of ACM Shanghai shares	0	(6,988)
ACM Shanghai dividends	(11,768)	(7,578)
Net cash provided by financing activities	339,865	738,115
Effect of exchange rate changes on cash, cash equivalents and restricted cash	12,548	4,942
Net increase in cash, cash equivalents and restricted cash	140,484	656,029
Cash, cash equivalents and restricted cash at beginning of period	765,962	411,310
Cash, cash equivalents and restricted cash at end of period	906,446	1,067,339
Supplemental disclosure of cash flow information:
Interest paid	5,564	5,166
Income taxes paid	44,153	29,951
Reconciliation of cash, cash equivalents and restricted cash in consolidated statements of cash flows:
Cash and cash equivalents	884,934	1,058,909
Restricted cash	21,512	8,430
Cash, cash equivalents and restricted cash	906,446	1,067,339
Non-cash investing activities:
Transfer of prepayment for property to property, plant, and equipment	163	31
Transfer from other non-current assets to long term investment	0	16,737
Transfer from inventories to property, plant and equipment	0	589
Purchases of property, plant and equipment through other payables and accrued expenses	18,014	21,352
Non-cash financing activities:
Cashless exercise of stock options	0	195
Deferred offering costs included in other payables and accrued expenses	$ 2,729	$ 0

INCOME TAXES - Schedule of Income Tax Benefit (Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Income Tax Disclosure [Abstract]
Total income tax expense	$ (1,886)	$ (2,689)	$ (19,129)	$ (6,733)

- Definition

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

+ References

+ Details

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Income Statement [Abstract]
Revenue (note 3)	$ 367,687	$ 269,160	$ 891,869	$ 656,879
Cost of revenue, including cost of revenue from related parties of $26,678 and $58,730 for the three and nine months ended September 30, 2026, respectively and $19,293 and $45,209 for the three and nine months ended September 30, 2025 respectively.	215,275	156,011	497,601	356,719
Gross profit	152,412	113,149	394,268	300,160
Operating expenses:
Sales and marketing	26,906	22,311	71,372	60,756
Research and development	51,372	39,651	130,175	100,971
General and administrative	18,607	22,264	51,274	52,039
Total operating expenses	96,885	84,226	252,821	213,766
Income from operations	55,527	28,923	141,447	86,394
Interest income	7,422	3,100	19,283	10,452
Interest expense	(1,572)	(1,851)	(5,564)	(5,166)
Realized gain on short-term investments (note 11)	28	0	28	54
Unrealized (loss) gain on short-term investments (note 11)	(39,133)	18,656	29,053	20,304
Other expense, net	(6,923)	(3,411)	(26,016)	(4,019)
(Loss) income from equity method investments	(7,140)	3,670	15,706	6,395
Income before income taxes	8,209	49,087	173,937	114,414
Income tax expense (note 15)	(1,886)	(2,689)	(19,129)	(6,733)
Net income	6,323	46,398	154,808	107,681
Less: Net income attributable to non-controlling interests	4,779	10,509	46,973	21,652
Net income attributable to ACM Research, Inc.	1,544	35,889	107,835	86,029
Comprehensive income:
Net income	6,323	46,398	154,808	107,681
Foreign currency translation adjustment, net of tax of nil	25,290	9,899	83,228	15,554
Unrealized gain on available-for-sale investments, net of tax	0	2,391	675	2,391
Comprehensive income	31,613	58,688	238,711	125,626
Less: Comprehensive income attributable to non-controlling interests	11,576	13,017	69,220	25,224
Comprehensive income attributable to ACM Research, Inc.	$ 20,037	$ 45,671	$ 169,491	$ 100,402
Net income attributable to ACM Research, Inc. per share of common stock (note 2):
Basic (in dollars per share)	$ 0.02	$ 0.56	$ 1.59	$ 1.35
Diluted (in dollars per share)	$ 0.02	$ 0.52	$ 1.49	$ 1.26
Weighted average shares of common stock outstanding used in computing per share amounts (note 2):
Basic (in shares)	69,713,048	64,381,296	67,817,058	63,876,709
Diluted (in shares)	73,629,630	68,414,313	71,600,446	67,551,302

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)

9 Months Ended

Sep. 30, 2026

Accounting Policies [Abstract]

Schedule of Cash and Cash Equivalents

The following table presents cash and cash equivalents, according to jurisdiction as of September 30, 2026 and December 31, 2025:


	September 30, 2026		December 31, 2025
United States	$	337,898	$	107,184
Mainland China	98,973		228,777
China Hong Kong	443,389		421,104
South Korea	3,399		241
Singapore	1,275		67
Total	$	884,934	$	757,373

Schedule of Fair Value, by Balance Sheet Grouping

Assets 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 September 30, 2026:
Assets
Cash equivalents	$	310,877	$	—	$	—	$	310,877
Short-term investments	66,910		—		—		66,910
Available-for-sale debt securities	—		—		10,807		10,807
	$	377,787	$	—	$	10,807	$	388,594

As of December 31, 2025:
Assets
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

Schedule of 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 September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Numerator:
Net income	$	6,323	$	46,398	$	154,808	$	107,681
Less: Net income attributable to non-controlling interests	4,779		10,509		46,973		21,652
Net income available to common stockholders, basic	1,544		35,889		107,835		86,029
Less: Dilutive effect arising from stock-based awards by ACM Shanghai	104		503		914		884
Net income available to common stockholders, diluted	$	1,440	$	35,386	$	106,921	$	85,145

Weighted average shares outstanding, basic	69,713,048		64,381,296		67,817,058		63,876,709
Effect of dilutive securities	3,916,582		4,033,017		3,783,388		3,674,593
Weighted average shares outstanding, diluted	73,629,630		68,414,313		71,600,446		67,551,302

Net income per share of common stock:
Basic	$	0.02	$	0.56	$	1.59	$	1.35
Diluted	$	0.02	$	0.52	$	1.49	$	1.26

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	9 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 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 condensed consolidated balance sheet as of September 30, 2026 and the condensed consolidated results of operations for the three and nine months ended September 30, 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	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 their 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.
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 and cannot be withdrawn before maturity. These deposits are presented as short- 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.
Restricted Cash	Restricted Cash 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	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 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 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, short-term and long-term deposits, short-term and long-term investments, other receivables, accounts receivable, bills and 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, bills and 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. Refer to note 9 for fair value information related to the Company’s outstanding long-term borrowings as of September 30, 2026 and December 31, 2025. The Company did not have any assets and liabilities measured at fair value on a non-recurring basis as of September 30, 2026 and December 31, 2025.
Bills payable	Bills payable Bills payable represent trade payable due to the suppliers, for which the banks have guaranteed the payment. Bills payable are typically with terms of 6 months.
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 and nine months ended September 30, 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 stock options exercisable into shares of the Company’s common stock of 100,612 and 109,620 for the three and nine months ended September 30, 2026, respectively and 655,861 and 1,218,503 for the three and nine months ended September 30, 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 September 30, 2026 and 2025, two customers accounted for 37.3% and 38.9% of revenue, respectively. For the nine months ended September 30, 2026 and 2025, two customers accounted for 28.0% and three customers accounted for 46.3% of revenue, respectively. •Accounts receivable concentration. As of September 30, 2026 and December 31, 2025, five customers accounted for 60.8% 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 issued accounting pronouncements not yet adopted	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

9 Months Ended

Sep. 30, 2026

RELATED PARTY BALANCES AND TRANSACTIONS


Advances to related parties	September 30, 2026		December 31, 2025
Ninebell	$	163	$	163
Shengyi	34		2,337
Total	$	197	$	2,500


Accounts payable	September 30, 2026		December 31, 2025
Ninebell	$	20,449	$	20,353
Shengyi	13,325		11,707
Total	$	33,774	$	32,060


	Three Months Ended September 30,				Nine Months Ended September 30,
Purchases of materials	2026		2025		2026		2025
Ninebell	$	23,696	$	17,839	$	61,468	$	44,852
Shengyi	7,157		5,541		14,496		11,527
Total	$	30,853	$	23,380	$	75,964	$	56,379


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Service fee charged by
Shengyi	$	310	$	291	$	626	$	2,190

Rental fee charged to
Ninebell	$	38	$	—	$	85	$	—

- 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 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477657/942-210-S45-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478478/942-210-S50-1

Reference 3: 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 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7)(e)(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1

Reference 5: 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 6: 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 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 13: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/850/tableOfContent

Reference 14: 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 15: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483326/850-10-50-1

Reference 16: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
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-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)

9 Months Ended

Sep. 30, 2026

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Direct or Indirect Interests of Subsidiaries

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


			Effective interest held as at
Subsidiaries	Place and date of incorporation	Principal Activities	September 30, 2026		December 31, 2025
ACM Research (Shanghai), Inc. ("ACM Shanghai")	Mainland China, May 2005	Principal operating subsidiary	72.8	%	74.6	%
ACM Research (Wuxi), Inc. ("ACM Wuxi")	Mainland China, July 2011	Sales and services	72.8	%	74.6	%
CleanChip Technologies Limited ("CleanChip")	Hong Kong, June 2017	Trading partner between ACM Shanghai and its customers	72.8	%	74.6	%
ACM Research Korea CO., LTD. ("ACM Korea")	Republic of Korea ("South Korea"), December 2017	Sales, marketing, R&D, production	72.8	%	74.6	%
ACM Research (Lingang), Inc. ("ACM Lingang")	Mainland China, March 2019	Management of production activities	72.8	%	74.6	%
ACM Research (CA), Inc. ("ACM California")	USA, April 2019	Procurement for ACM Shanghai	72.8	%	74.6	%
ACM Research (Cayman), Inc.	Cayman Islands, April 2019	Administrative function (inactive)	100.0	%	100.0	%
ACM Research (Singapore) PTE. Ltd. ("ACM Singapore")	Singapore, August 2021	Sales, marketing, business development	100.0	%	100.0	%
ACM Research (Beijing), Inc. ("ACM Beijing")	Mainland China, February 2022	Sales and services	72.8	%	74.6	%
Hanguk ACM CO., LTD	South Korea, March 2022	Sales, services, business development	100.0	%	100.0	%
Yusheng Micro Semiconductor (Shanghai) Co., Ltd.	Mainland China, June 2023	Component development and production	72.8	%	74.6	%
ACM-Wooil Microelectronics (Shanghai) Co., Ltd.	Mainland China, June 2023	Component development and production	53.3	%	54.5	%
ACM Research (Chengdu), Inc. ("ACM Chengdu")	Mainland China, December 2024	Sales and services	72.8	%	74.6	%
Shengyi Micro Semiconductor (Shanghai) Co., Ltd.	Mainland China, December 2024	Business development	61.9	%	63.4	%

Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Additional Paid- in Capital	Retained Earnings	Statutory Surplus Reserve	Accumulated Other Comprehensive (Loss) Income	Non-controlling Interests	Common Stock Class A	Common Stock Class A Common Stock	Common Stock Class B	Common Stock Class B Common Stock
Beginning balance (in shares) at Dec. 31, 2024								57,938,885		5,021,811
Beginning balance at Dec. 31, 2024	$ 1,095,906	$ 677,476	$ 260,000	$ 30,514	$ (63,372)	$ 191,281		$ 6		$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	107,681		86,029			21,652
Repurchase of shares held by ACM Shanghai	(6,988)	(4,759)				(2,229)
Proceeds from issuance of ACM Research shares, net of issuance costs/ Issuance of shares by ACM Shanghai	622,964	390,170				232,794
Foreign currency translation adjustment	15,554				12,589	2,965
Exercise of stock options (in shares)								1,915,755
Exercise of stock options	27,893	19,577				8,316
Stock-based compensation	27,149	22,665				4,484
Capital contribution by non-controlling shareholder	242					242
ACM Shanghai dividend	(7,578)					(7,578)
Unrealized gain on available-for-sale investments, net of tax	2,391				1,784	607
Ending balance (in shares) at Sep. 30, 2025								59,854,640		5,021,811
Ending balance at Sep. 30, 2025	1,885,214	1,105,129	346,029	30,514	(48,999)	452,534		$ 6		$ 1
Beginning balance (in shares) at Jun. 30, 2025								59,096,971		5,021,811
Beginning balance at Jun. 30, 2025	1,191,689	704,570	310,140	30,514	(58,781)	205,239		$ 6		$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	46,398		35,889			10,509
Proceeds from issuance of ACM Research shares, net of issuance costs/ Issuance of shares by ACM Shanghai	622,964	390,170				232,794
Foreign currency translation adjustment	9,899				7,998	1,901
Exercise of stock options (in shares)								757,669
Exercise of stock options	4,311	4,311
Stock-based compensation	7,562	6,078				1,484
Unrealized gain on available-for-sale investments, net of tax	2,391				1,784	607
Ending balance (in shares) at Sep. 30, 2025								59,854,640		5,021,811
Ending balance at Sep. 30, 2025	1,885,214	1,105,129	346,029	30,514	(48,999)	452,534		$ 6		$ 1
Beginning balance (in shares) at Dec. 31, 2025							60,590,017	60,590,017	5,021,811	5,021,811
Beginning balance at Dec. 31, 2025	1,930,509	1,115,504	350,428	34,164	(35,740)	466,146		$ 6		$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	154,808		107,835			46,973
Proceeds from issuance of ACM Research shares, net of issuance costs (in shares)								2,884,615
Proceeds from issuance of ACM Research shares, net of issuance costs/ Issuance of shares by ACM Shanghai	148,389	148,389
Foreign currency translation adjustment	83,228				61,163	22,065
Exercise of stock options (in shares)								1,371,970
Exercise of stock options	51,386	25,842				25,544
Stock-based compensation	22,906	18,635				4,271
Sale of ACM Shanghai shares, net of tax (note 1)	87,913	69,207				18,706
Conversion of Class B common stock to Class A common stock (in shares)								30,003		(30,003)
Capital contribution by non-controlling shareholder	138					138
ACM Shanghai dividend	(11,768)					(11,768)
Unrealized gain on available-for-sale investments, net of tax	675				493	182
Ending balance (in shares) at Sep. 30, 2026							64,876,605	64,876,605	4,991,808	4,991,808
Ending balance at Sep. 30, 2026	2,468,184	1,377,577	458,263	34,164	25,916	572,257		$ 6		$ 1
Beginning balance (in shares) at Jun. 30, 2026								64,651,365		4,991,808
Beginning balance at Jun. 30, 2026	2,405,123	1,361,841	456,719	34,164	7,423	544,969		$ 6		$ 1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6,323		1,544			4,779
Foreign currency translation adjustment	25,290				18,493	6,797
Exercise of stock options (in shares)								225,240
Exercise of stock options	20,608	7,117				13,491
Stock-based compensation	10,702	8,619				2,083
Capital contribution by non-controlling shareholder	138					138
Unrealized gain on available-for-sale investments, net of tax	0
Ending balance (in shares) at Sep. 30, 2026							64,876,605	64,876,605	4,991,808	4,991,808
Ending balance at Sep. 30, 2026	$ 2,468,184	$ 1,377,577	$ 458,263	$ 34,164	$ 25,916	$ 572,257		$ 6		$ 1

OTHER PAYABLES AND ACCRUED EXPENSES (Tables)

9 Months Ended

Sep. 30, 2026

Payables and Accruals [Abstract]

Schedule of Other Payables and Accrued Expenses

At September 30, 2026 and December 31, 2025, other payables and accrued expenses consisted of the following:


	September 30, 2026		December 31, 2025
Accrued commissions	$	34,479	$	26,931
Accrued warranty	26,191		19,104
Accrued payroll	27,697		24,830
Accrued machine sales fees	24,309		13,341
Accrued Lingang construction fees	17,365		24,258
Accrued payroll taxes	62,582		19,552
Payable for investments	1,040		4,838
Others	19,897		17,542
Total	$	213,560	$	150,396

Schedule of Product Warranty Liability

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


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Balance at beginning of period	$	22,938	$	13,544	$	19,104	$	12,710
Additions	5,596		3,973		13,324		9,679
Utilized	(2,343)		(228)		(6,237)		(5,100)
Balance at end of period	$	26,191	$	17,289	$	26,191	$	17,289

STOCK-BASED COMPENSATION - Schedule of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	$ 10,702	$ 7,562	$ 22,906	$ 27,149
Income Statement Location [Axis]: us-gaap:CostOfRevenue
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	491	253	1,016	1,138
Income Statement Location [Axis]: us-gaap:GeneralAndAdministrativeExpense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	3,897	3,793	9,380	12,887
Income Statement Location [Axis]: us-gaap:ResearchAndDevelopmentExpense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	4,195	1,915	7,569	7,270
Income Statement Location [Axis]: us-gaap:SellingAndMarketingExpense
Stock-based Compensation Expense [Abstract]
Stock-based compensation expense	$ 2,119	$ 1,601	$ 4,941	$ 5,854

PROPERTY, PLANT AND EQUIPMENT, NET - Narrative (Details) ¥ in Thousands, $ in Thousands			1 Months Ended	3 Months Ended		9 Months Ended
	Jun. 05, 2026 USD ($) m²	Jun. 05, 2026 CNY (¥) m²	May 31, 2026 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2026 USD ($)	Sep. 30, 2025 USD ($)	May 31, 2026 CNY (¥)	Dec. 31, 2025 USD ($)
Property, Plant, and Equipment [Line Items]
Depreciation				$ 8,046	$ 2,458	$ 19,426	$ 8,362
Payments to acquire property, plant, and equipment						112,485	$ 42,473
Property cost				472,669		472,669			$ 353,594
Bank of China
Property, Plant, and Equipment [Line Items]
Line of credit facility, maximum borrowing capacity			$ 34,380					¥ 231,518	$ 5,940
Line of credit facility, interest rate during period			2.65%
Debt instrument, term			120 months
Facility In Shanghai Pudong New Area
Property, Plant, and Equipment [Line Items]
Area of land \| m²	3,196	3,196
Payments to acquire property, plant, and equipment	$ 45,904	¥ 312,699
Land, Buildings, And Plants \| ACM Research (Lingang), Inc. ("ACM Lingang")
Property, Plant, and Equipment [Line Items]
Property cost				$ 37,087		$ 37,087

COMMON STOCK (Details)	9 Months Ended
COMMON STOCK (Details)	Sep. 30, 2026 vote $ / shares shares	Dec. 31, 2025 shares
Common Stock Class A
Class of Stock [Line Items]
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
Common stock issued (in shares)	64,876,605	60,590,017
Common stock outstanding (in shares)	64,876,605	60,590,017
Class B Common Stock
Class of Stock [Line Items]
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
Shares converted (in shares)	1
Common stock issued (in shares)	4,991,808	5,021,811
Common stock outstanding (in shares)	4,991,808	5,021,811

- 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.

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- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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+ Details

INCOME TAXES

9 Months Ended

Sep. 30, 2026

Income Tax Disclosure [Abstract]

INCOME TAXES


	Three Months Ended September 30,				Nine Months Ended September 30,
	2026		2025		2026		2025
Total income tax expense	$	(1,886)	$	(2,689)	$	(19,129)	$	(6,733)

The Company’s effective tax rate differs from the statutory rates of 21% for U.S. federal income tax purposes and 25% for Chinese income tax purposes primarily due to the effects of the valuation allowance and certain permanent book-tax differences, including stock-based compensation, Subpart F income, net CFC tested income (NCTI) inclusions, and the R&D super deduction. As a result, the Company recorded income tax expense of $19,129 and $6,733 for the nine months ended September 30, 2026 and 2025, respectively. The increase in the Company's effective tax rate for the nine months ended September 30, 2026 compared with the corresponding period in 2025 was primarily attributable to a higher estimated annual effective tax rate resulting from changes in the mix of earnings by jurisdiction and the relative impact of valuation allowances and permanent tax adjustments, partially offset by favorable discrete tax items recognized during 2026.

Under the changes to Section 174 enacted 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 foreign R&D expenses results in an increase in the Company’s global intangible low-taxed income (“GILTI”) inclusion. The enactment of the One Big Beautiful Bill Act (“OBBBA”), signed into law in July 2025, repealed 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 September 30, 2026 and December 31, 2025. If recognized, the net impact on the Company’s effective tax rate would be approximately $20,770. The Company does not expect any significant changes in its unrecognized tax benefits within the next 12 months. The Company recognizes interest and penalties related to uncertain tax provisions as a component of income tax expense. For the nine months ended September 30, 2026 and 2025, the Company recognized $2,466 and 3,379, respectively, of interest and penalties.

Pursuant to the Corporate Income Tax Law of mainland China, all of the Company’s mainland China subsidiaries are generally subject to mainland China Corporate Income Taxes at a statutory rate of 25%, except for ACM Shanghai and ACM Lingang, which qualify for preferential tax treatments. 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 has been certified as an “advanced and new technology enterprise” in 2012 and subsequently renewed its certification in 2016, 2018, 2021, and 2024. The current certification remains effective through December 31, 2026. ACM Lingang is eligible for preferential tax incentives that provide for an exemption from income tax during its first two profitable years following the utilization of net operating loss carryforwards, followed by a reduced tax rate equal to 50% of the statutory tax rate for the subsequent three years.

- Definition

The entire disclosure for income tax.

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+ Details