AMTECH SYSTEMS INC

NOTES TO CONDENSED CONSOLI DATED FINANCIAL STATEMENTS

THREE MONTHS ENDED DECEMBER 31, 2025 AND 2024

(UNAUDITED)

1. Basis of Presentation and Significant Accounting Policies

Nature of Operations and Basis of Presentation– Amtech provides equipment, consumables and services for semiconductor device packaging, wafer production and device fabrication. Our products are used to fabricate and package semiconductor devices, such as graphic processing units (GPU’s) used in AI applications, silicon carbide (SiC) and silicon (Si) power devices and other optical, analog and digital devices. We sell these products to semiconductor device packaging, electronic assembly and device fabrication companies worldwide.

We serve niche markets in industries that are experiencing technological advances, and which historically have been very cyclical. Therefore, our future profitability and growth depend on our ability to develop or acquire and market profitable new products and on our ability to adapt to cyclical trends.

The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”), and consequently do not include all disclosures normally required by accounting principles generally accepted in the United States of America (“GAAP”). In the opinion of management, the accompanying unaudited interim condensed consolidated financial statements contain all adjustments necessary, all of which are of a normal and recurring nature, to present fairly our financial position, results of operations and cash flows. Certain information and note disclosures normally included in financial statements have been condensed or omitted pursuant to the rules and regulations of the SEC. The condensed consolidated balance sheet at September 30, 2025, has been derived from the audited consolidated financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in our Annual Report on Form 10-K for the fiscal year ended September 30, 2025.

Our fiscal year is from October 1 to September 30. Unless otherwise stated, references to particular years, quarters, months or periods refer to our fiscal years ending or ended September 30, and the associated quarters, months, and periods of those fiscal years.

The consolidated results of operations for the three months ended December 31, 2025, are not necessarily indicative of the results to be expected for the full fiscal year.

Principles of Consolidation– The consolidated financial statements include the accounts of the Company and our wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Use of Estimates – The preparation of 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 date of the consolidated financial statements and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from those estimates.

Reclassifications – Certain reclassifications have been made to prior year financial statement footnotes to conform to the current year presentation. These reclassifications, which include the breakout of contract liability activity, had no effect on the previously reported consolidated financial statements for any period.

Accounts Receivable and Allowance for Credit Losses– Accounts receivable are recorded at the sales price of products sold to customers on trade credit terms. We establish a valuation allowance to reflect our best estimate of expected losses inherent in our accounts receivable balance. The allowance is based on our evaluation of the aging of the receivables, historical write-offs, the current economic environment and communications with the customer. We write off individual accounts against the allowance when we no longer believe that it is probable that we will collect the receivable because we become aware of a customer’s inability to meet its financial obligations.

Intangible Assets – Intangible assets acquired in business combinations are capitalized and subsequently amortized on a straight-line basis over their estimated useful life. We review our intangible assets for impairment when events or circumstances indicate the carrying value may not be recoverable. When indicators exist, recoverability of assets is measured by a comparison of the carrying value of the asset group to the estimated undiscounted future net cash flows expected to be generated by the asset group. If the asset group is determined not to be recoverable, the Company performs an analysis of the fair value of the individual long-lived assets and will recognize an impairment loss when the fair value is less than the carrying value of such long-lived assets. Additional information on impairment testing of intangible assets can be found in Notes 1 and 8 of our Annual Report on Form 10-K for the year ended September 30, 2025.

In the second quarter of fiscal year 2025, we recorded impairment of definite lived intangible assets in our Semiconductor Fabrication Solutions segment. See Note 6 for a description of the facts and circumstances leading to the intangible asset impairment.

Goodwill – Goodwill is recorded when the purchase price paid for an acquisition exceeds the estimated fair value of net identified tangible and intangible assets acquired. Goodwill is not subject to amortization but is tested for impairment annually or when it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If it is concluded that there is impairment, we would recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value (although the loss would not exceed the total amount of goodwill allocated to the reporting unit). Additional information on impairment testing of goodwill can be found in Notes 1 and 9 of our Annual Report on Form 10-K for the year ended September 30, 2025.

In the second quarter of fiscal year 2025, we recorded an impairment of goodwill in our Semiconductor Fabrication Solutions and Thermal Processing Solutions segments. See Note 6 for a description of the facts and circumstances leading to goodwill impairment.

Contract Liabilities– Contract liabilities are reflected in current liabilities on the Condensed Consolidated Balance Sheets as all performance obligations are expected to be satisfied within the next 12 months. Contract liabilities relate to payments invoiced or received in advance of completion of performance obligations under a contract. Contract liabilities are recognized as revenue upon the fulfillment of performance obligations. Contract liabilities consist of customer deposits and deferred revenue as of December 31, 2025 and September 30, 2025.

The following is a summary of activity for contract liabilities, in thousands:

Warranty–A limited warranty is provided free of charge, generally for periods of 12 to 36 months to all purchasers of our new products and systems. Accruals are recorded for estimated warranty costs at the time revenue is recognized. While our warranty costs have historically been within our expectations and we believe that the amounts accrued for warranty expenditures are sufficient for all systems sold through December 31, 2025, we cannot guarantee that we will continue to experience a similar level of predictability regarding warranty costs. In addition, technological changes or previously unknown defects in raw materials or components may result in more extensive and frequent warranty service than anticipated, which could result in an increase in our warranty expense.

The following is a summary of activity in accrued warranty expense, in thousands:

Shipping Expense –Shipping and handling fees associated with outbound freight are expensed as incurred and included in selling, general and administrative expenses. Shipping expense was $0.1 million and $0.5 million for thethree months ended December 31, 2025 and 2024, respectively.

Employee Retention Tax – The Coronavirus Aid, Relief, and Economic Security Act (the “CARES Act”) provided an employee retention credit (“ERC”) which was a refundable tax credit against certain employment taxes. The Consolidated Appropriations Act (the “Appropriations Act”) extended and expanded the availability of the employee retention credit through December 31, 2021. The Appropriations Act amended the employee retention credit to be equal to 70% of qualified wages paid to employees during the 2021 calendar year. The Company qualified for the employee retention credit for qualified wages through December 2021, and filed a cash refund claim during the calendar year ended December 31, 2023. The employee retention credit in the amount of $2.1 million was received in the Company’s third fiscal quarter of 2025 and recognized as a reduction to payroll tax expense on the Condensed Consolidated Statements of Operations for the three months ended June 30, 2025. The ERC was credited against cost of sales, selling, general and administrative, and research, development and engineering for $1.0 million, $0.8 million, and $0.3 million, respectively.

Concentrations of Credit Risk– Our customers are primarily manufacturers of semiconductor substrates and devices and electronic assemblies. Financial instruments that potentially subject us to significant concentrations of credit risk consist principally of cash and trade accounts receivable. Credit risk is managed by performing credit evaluations of the customers’ financial condition, by requiring significant deposits where appropriate, and by actively monitoring collections. Letters of credit are required of certain customers depending on the size of the order, type of customer or its creditworthiness, and country of domicile.

As of December 31, 2025, one Thermal Processing Solutions customer represented 13% of accounts receivable. As of September 30, 2025, two Thermal Processing Solutions customers represented 15% and 13%, respectively, ofaccounts receivable.

We maintain our cash and cash equivalents in multiple financial institutions. Balances in the United States, which account for approximately 74%and 75% of total cash balances as of December 31, 2025 and September 30, 2025, respectively, are primarily invested in financial institutions insured by the FDIC as well as a money market account. The remainder of our cash is maintained with financial institutions with reputable credit in China, the United Kingdom, Singapore and Malaysia. We maintain cash in bank accounts in amounts which at times may exceed federally insured limits. At December 31, 2025 and September 30, 2025, Amtech’s balances exceeded insured limits by approximately $14.5 million and $12.0 million, respectively. We have not experienced any losses on such accounts.

Refer to Note 11 to Condensed Consolidated Financial Statements for information regarding major customers, foreign sales and revenue in other countries subject to fluctuation in foreign currency exchange rates.

Fair Value of Financial Instruments – We group our financial assets and liabilities measured at fair value on a recurring basis into three levels, based on the markets in which the assets and liabilities are traded, and the reliability of the assumptions used to determine fair value. These levels are:

Level 1 – Valuation is based upon quoted market prices for identical instruments traded in active markets.

Level 2 – Valuation is based on quoted market prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.

Level 3 – Valuation is generated from model-based techniques that use significant assumptions not observable in the market. Valuation techniques include use of discounted cash flow models and similar techniques.

It is our policy to use observable inputs whenever reasonably practicable to minimize the use of unobservable inputs when developing fair value measurements. When available, we use quoted market prices to measure fair value. If market prices are not available, the fair value measurement is based on models that use primarily market-based parameters including interest rate yield curves, option volatilities and currency rates. In certain cases, where market rate assumptions are not available, we are required to make judgments about assumptions market participants would use to estimate the fair value of a financial instrument. Changes in the underlying assumptions used, including discount rates and estimates of future cash flows, could significantly affect current or future valuations.

Cash and Cash Equivalents – Included in cash and cash equivalents in the Consolidated Balance Sheets are money market funds and time deposit accounts. Cash equivalents are classified as Level 1 in the fair value hierarchy.

Receivables and Payables – The recorded amounts of these financial instruments, including accounts receivable and accounts payable, approximate their fair value because of the short maturities of these instruments.

Impact of Recently Issued Accounting Pronouncements

In November 2024, the FASB issued ASU 2024-03, “Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses” (“ASU 2023-07”), which requires disclosure of additional information about specific expense categories underlying certain income statement expense line items. This ASU is effective for our annual periods beginning October 1, 2027, and interim periods beginning October 1, 2028, and requires either prospective or retrospective application. We are currently evaluating the impact of this ASU on our disclosures.

In December 2023, the FASB issued ASU 2023-09, “Income Taxes (Topic 740): Improvements to Income Tax Disclosures” (“ASU 2023-09”), which requires additional annual income tax disclosures. These additional disclosures include providing a tabular rate reconciliation comprised of eight specific categories, the disaggregation of income taxes paid between federal, state, and foreign jurisdictions, and the disaggregation of income from continuing operations before income tax expense and income tax expense from continuing operations between domestic and foreign. ASU 2023-09 eliminates the disclosure of the nature and estimate of reasonably possible changes to unrecognized tax benefits in the next 12 months or that an estimated range cannot be made. ASU 2023-09 is effective for fiscal years beginning on or after December 15, 2024, with early adoption permitted, and can be applied on a prospective or retrospective basis. We are currently evaluating the impact of this ASU on our disclosures.

In November 2023, the FASB issued ASU 2023-07, “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures” (“ASU 2023-07”), which improves reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. The ASU is effective for public business entities for fiscal years beginning after December 15, 2023, and for interim reporting periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The amendments in ASU 2023-07 should be applied retrospectively to all prior periods presented in the financial statements. Weadopted ASU 2023-07 in our Form 10-K for the year ended September 30, 2025. The adoption of this guidance impacted our disclosures only and didnot have a material impact. See Note 10 "Reportable Segments" below for more information.

There were no other new accounting pronouncements issued or effective as of December 31, 2025 that had or are expected to have a material impact on our consolidated financial statements.

2. Long-Term Debt

Our finance lease liabilities and long-term debt consists of the following, in thousands:

Interest expense on finance lease liabilities and long-term debt was $8,000 and $5,000 for the three months ended December 31, 2025 and 2024, respectively.

Finance Lease Obligations

Our finance lease obligations totaled $0.3 million as of December 31, 2025 and September 30, 2025, respectively.

The current and long-term portions of our finance leases are included in the current and long-term portions of finance lease liabilities and long-term debt in the table above and in our Condensed Consolidated Balance Sheets as of December 31, 2025 and September 30, 2025. See Note 5 for additional information.

3. Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income by the weighted average number of common shares outstanding for the period. Diluted EPS is computed similarly to basic EPS except that the denominator is increased to include the number of additional common shares that would have been outstanding if potentially dilutive common shares had been issued. Dilutive potential common shares include outstanding restricted stock units (“RSUs”) and stock options. In the case of a net loss, diluted earnings per share is calculated in the same manner as basic EPS.

For the three months ended December 31, 2025 and 2024, options for 78,772 and 919,637 weighted average shares, respectively, were excluded from the diluted EPS calculations because they were anti-dilutive. These shares could become dilutive in the future.

A reconciliation of the components of the basic and diluted EPS calculations follows, in thousands, except per share amounts:

(1)The number of common stock equivalents is calculated using the treasury method and the average market price during the period.

4. Inventories

The components of inventories are as follows, in thousands:

5. Leases

The following table provides information about the financial statement classification of our lease balances reported within the Condensed Consolidated Balance Sheets, in thousands:

The following table provides information about the financial statement classification of our lease expenses reported in the Condensed Consolidated Statements of Operations, in thousands:

Future minimum lease payments under non-cancelable leases as of December 31, 2025 are as follows, in thousands:

Operatinglease payments include $2.3 million related to options to extend lease terms that are reasonably certain of being exercised.

The following table provides information about the remaining lease terms and discount rates applied:

6. Goodwill and Intangible Assets

The Company accounts for goodwill at acquisition-date fair value and other finite intangibles at acquisition-date fair value less accumulated amortization. See Note 1 for a summary of the Company’s policies relating to goodwill and intangible assets.

Intangible Assets

The Company’s intangible assets, net consists of the following, in thousands:

The estimated aggregate amortization expense for each of the five succeeding fiscal years as of December 31, 2025 is as follows, in thousands:

The aggregate amortization expense during the three months ended December 31, 2025 and 2024 was $44,000 and$0.1 million, respectively.

We review our intangible assets for impairment when events or circumstances indicate the carrying value may not be recoverable. For the period ended March 31, 2025, the Company lowered its guidance for the second quarter of fiscal year 2025 and reset projections for the rest of the year due to a prolonged weakness in the mature node semiconductor market driven by high inventory, tepid demand, and geopolitical tensions. As disclosed in the Goodwill section below, this resulted in a triggering event for impairment of goodwill. The results of the goodwill impairment test indicated that the book value of our Semiconductor Fabrication Solutions segment and Thermal Processing Solutions segment was in excess of fair value and was impaired. Prior to recognizing any impairment of goodwill, we tested the related long-lived assets for impairment in our Semiconductor Fabrication Solutions and Thermal Processing Solutions segments. We tested each identified asset group within each segment by first performing a recoverability test, comparing projected undiscounted cash flows from the use and eventual disposition of each asset group to its carrying value. This test indicated that the undiscounted cash flows were not sufficient to recover the carrying value of certain asset groups within our Semiconductor Fabrication Solutions segment. We then compared the carrying value of the individual long-lived assets within those asset groups against their fair value in order to determine if impairment existed. Determining the fair value of those asset groups involves the use of significant estimates and assumptions, including projections of revenues and expenses and related cash flows based on assumed long-term growth rates and demand trends, and estimated discount rates based on the asset group's weighted average return on assets, as derived from various methods. The fair value of the intangible assets was estimated using various valuation methodologies, including the multi-period excess earnings method and the relief from royalty method and the distributor method. These fair value measurements fall under Level 3 of the fair value hierarchy. As a result, we recorded a total impairment charge for intangible assets in our Semiconductor Fabrication Solutions segment of $2.6 million during the quarter ended March 31, 2025. The $2.6 million impairment consists of $1.8 million for customer relationships and $0.8 million for trade names primarily at Entrepix.

Goodwill

The Company evaluates goodwill at the reporting unit level, which, for the Company, is at the level of the reportable segments, Thermal Processing Solutions and Semiconductor Fabrication Solutions. The changes in carrying amount ofgoodwill allocated to each of the reporting segments for the three months ended December 31, 2025 is as follows, in thousands:

We review goodwill for impairment when events or circumstances indicate the carrying value may not be recoverable. For the period ended March 31, 2025, the Company lowered its guidance for the second quarter of fiscal year 2025 and reset projections for future periods due to prolonged weakness in the mature node semiconductor market driven by high inventory, tepid demand, and geopolitical tensions. This triggering event indicated a need to test goodwill for impairment. The goodwill impairment test indicated book value was in excess of fair value by $15.4 million for our Semiconductor Fabrication Solutions segment and $5.0 million for our Thermal Processing Solutions segment. As a result, we recorded a $20.4 million impairment charge in the period ended March 31, 2025.

Determining the fair value of a reporting unit involves the use of significant estimates and assumptions. Our goodwill impairment test uses a weighting of the income approach and the market approach to estimate a reporting unit’s fair value. The income approach is based on a discounted future cash flow analysis that uses certain assumptions including: projections of revenues and expenses and related cash flows based on assumed long-term growth rates and demand trends; expected future investments and working capital requirements to sustain and grow the business; and estimated discount rates based on the reporting unit’s weighted average cost of capital as derived by the Capital Asset Pricing Model and other methods, which includes observable market inputs and other data from identified comparable companies. The same estimates are also used internally for our capital budgeting process, and for long-term and short-term business planning and forecasting. We test the reasonableness of the inputs and outcomes of our discounted cash flow analysis against available comparable market data, and we also perform a reconciliation of our total market capitalization to the estimated fair value of all of our reporting units. The market approach is based on the application of appropriate market-derived multiples selected from (i) comparable publicly-traded companies and/or (ii) the implied transaction multiples derived from identified merger and acquisition activity in the market. Multiples are then selected based on a comparison of the reviewed data to that of the reporting unit and applied to relevant historical and forecasted financial parameters such as levels of revenues, EBITDA, EBIT or other metrics. The calculation of fair value falls under Level 3 of the fair value hierarchy.

If the future performance of these reporting units fall short of our expectations, if there are significant changes in operations due to changes in market conditions or if our stock price declined, we could be required to recognize additional material impairment charges in future periods.

7. Income Taxes

Our effective tax rate was 84.3%and 58.8% for the three months ended December 31, 2025 and 2024, respectively. The effective tax rate for thethree months ended December 31, 2025 differs from the U.S. statutory tax rate of 21% primarilydue to foreign income taxed at a foreign rate different than 21%, for permanent items and changes in valuation allowances. For the three months ended December 31, 2025 and 2024, we recorded income tax expense of $0.6 million and $0.4 million, respectively. The quarterly income tax provision is calculated using an estimated annual effective tax rate, based upon expected annual income, permanent items, statutory rates and planned tax strategies in the various jurisdictions in which we operate. However, losses in certain jurisdictions and discrete items are excluded from the determination of the estimated annual effective tax rate.

8. Equity and Stock-Based Compensation

Stock-based compensation expense was $0.2 million and $0.3 million in thethree months ended December 31, 2025 and 2024, respectively. Stock-based compensation expense is included in selling, general and administrative expenses.

The following table summarizes our stock option activity during thethree months ended December 31, 2025:

The fair value of options was estimated at the applicable grant date using the Black-Scholes option pricing model with the following assumptions:

The following table summarizes our RSU activity during thethree months ended December 31, 2025:

Stock Repurchase Plan

On December 9, 2025, our Board of Directors (the “Board”) approved a new stock repurchase program, pursuant to which we may repurchase up to $5.0 million of our outstanding Common Stock over aone-year period. Repurchases under the program will be made in open market transactions at prevailing market prices, in privately negotiated transactions, or by other means in compliance with the rules and regulations of the SEC; however, we have no obligation to repurchase shares and the timing, actual number, and value of shares to be repurchased is subject to management’s discretion and will depend on our stock price and other market conditions. We may, in the sole discretion of the Board, terminate the repurchase program at any time while it is in effect. Repurchased shares may be retired or kept in treasury for further issuance. There wereno repurchases during the quarter ended December 31, 2025, and $5.0 million remains available for repurchases.

Performance-Based Restricted Stock Units

As of December 31, 2025 we incurred $50,000 of equity compensation expense associated with our outstanding performance-based RSUs. The ultimate dollar value of the RSUs depends on the percentage increase in Amtech’s EBITDA above 8% during fiscal year 2026 and is classified as a liability within accrued compensation and related taxes on the Condensed Consolidated Balance Sheets.

9. Commitments and Contingencies

Purchase Obligations – As of December 31, 2025, we had unrecorded purchase obligations in the amount of $5.4 million. These purchase obligations consist of outstanding purchase orders for goods and services. While the amount represents purchase agreements, the actual amounts to be paid may be less in the event that any agreements are renegotiated, canceled or terminated.

Legal Proceedings and Other Claims – From time to time, we are a party to claims and actions for matters arising out of our business operations. We regularly evaluate the status of the legal proceedings and other claims in which we are involved to assess whether a loss is probable or there is a reasonable possibility that a loss, or an additional loss, may have been incurred and determine if accruals are appropriate. If accruals are not appropriate, we further evaluate each legal proceeding to assess whether an estimate of possible loss or range of possible loss can be made for disclosure. Although the outcome of claims and litigation is inherently unpredictable, we believe that we have adequate provisions for any probable and estimable losses. It is possible, nevertheless, that our consolidated financial position, results of operations or liquidity could be materially and adversely affected in any period by the resolution of a claim or legal proceeding. Legal expenses related to defense, negotiations, settlements, rulings and advice of outside legal counsel are expensed as incurred.

Employment Contracts– We have employment contracts and change in control agreements with, and severance plans covering, certain officers and management employees under which severance payments would become payable in the event of specified terminations without cause or terminations under certain circumstances after a change in control. If severance payments under the current employment contracts or severance plans were to become payable, the severance payments would generally range fromsixto twelve months of salary.

10. Reportable Segments

In the operation of the business, management, including our Chief Operating Decision Maker (“CODM”), who is also our Chief Executive Officer, reviews certain financial information, including segmented internal profit and loss statements. The primary profitability measure used by the CODM to review segment operating results is net income. The CODM uses net income to allocate resources during our annual planning process and throughout the year, as well as to assess the performance of our segments, primarily by monitoring actual results compared to prior period and expected results.

Amtech hastwo operating segments that are structured around the types of product offerings provided to our customers. In addition, the operating segments may be further distinguished by the Company’s respective brands. Thesetwo operating segments comprise ourtwo reportable segments discussed below. Ourtwo reportable segments are as follows:

Thermal Processing Solutions– We design, manufacture, sell and service thermal processing equipment and related controls for use by leading semiconductor manufacturers, and in electronics, automotive and other industries.

Semiconductor Fabrication Solutions– We produce consumables parts and services, and equipment for producing silicon carbide, silicon and gallium nitride wafers, optical components and a variety of crystalline materials.

Information concerning our reportable segments is as follows, in thousands:

(1)Other segment items consists primarily of expenses related to foreign currency gain or loss and income tax provision (benefit). Thermal Processing Solutions and Semiconductor Fabrication Solutions income tax provision was $0.6 million and $1,000.

(2)Non-segment items consists primarily of expenses related to corporate salaries and professional services expenses, income tax, interest income and interest expense.

(1)Other segment items consists primarily of expenses related to foreign currency gain or loss and income tax provision. Thermal Processing Solutions and Semiconductor Fabrication Solutions income tax provision was $0.3 million and $1,000, respectively.

(2)Non-segment items consists primarily of expenses related to corporate salaries and professional services expenses, gain on sale of assets, income tax, interest income and interest expense.

*Non-segment related to depreciation and amortization expense at corporate.

*Non-segment related assets include cash, fixed assets, and other assets.

11. Major Customers and Foreign Sales

During the three months ended December 31, 2025, no customer represented 10% of our net revenues. During the three months ended December 31, 2024, one Thermal Processing Solutions segment customer represented 22%of our net revenues.

Our net revenues were from customers in the following geographic regions: