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SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-Q

For the Quarterly Period Ended September 30, 2003

or

For the transition period from                               to                              

Commission file number 0-29454

POWER-ONE, INC.
(Exact name of registrant as specified in its charter)

Registrant's telephone number, including area code (805) 987-8741

Not Applicable
(Former name, former address and former fiscal year, if changed since last report)

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

        Indicate by check mark whether the registrant is considered an accelerated filer as defined in Rule 12b-2 of the Exchange Act. Yes ý No o

        As of November 10, 2003, 83,267,778 shares of the Registrant's $0.001 par value common stock were outstanding.

POWER-ONE, INC.

INDEX

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PART I—FINANCIAL INFORMATION

Item 1—Consolidated Financial Statements

POWER-ONE, INC.

CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data, unaudited)

See notes to consolidated financial statements.

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POWER-ONE, INC.

CONSOLIDATED BALANCE SHEETS

(In thousands, except per share data)

See notes to consolidated financial statements.

4

POWER-ONE, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands, unaudited)

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SUPPLEMENTAL DISCLOSURE OF NONCASH INVESTING AND FINANCING ACTIVITIES

        On February 14, 2003, the Company acquired all the capital stock of di/dt, Inc. for approximately 1.4 million shares of the Company's common stock, $0.9 million in cash, plus $0.1 million in acquisition costs.

        In conjunction with the acquisition, liabilities were assumed as follows (in thousands):

(a)

The asset impairment charge of $44,770 included in the Consolidated Statement of Cash Flows for the 9 months ended September 30, 2002 included $23,444 for the impairment of identifiable intangibles in accordance with SFAS No. 144, $18,809 for the impairment of property and equipment calculated in accordance with SFAS No. 144 and $2,517 for the fixed asset portion of the period's restructuring charge.

See notes to consolidated financial statements.

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POWER-ONE, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(In thousands, unaudited)

See notes to consolidated financial statements.

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POWER-ONE, INC.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

NOTE 1—BASIS OF PRESENTATION

        The accompanying consolidated financial statements have been prepared without audit and reflect all adjustments, consisting of normal recurring adjustments, which are, in the opinion of management, necessary for a fair statement of financial position and the results of operations for the interim periods. The statements have been prepared in accordance with accounting principles generally accepted in the United States of America and pursuant to the rules and regulations of the Securities and Exchange Commission ("SEC"). Certain information and footnote disclosures, normally included in financial statements prepared in accordance with accounting principles generally accepted in the United States of America, have been condensed or omitted pursuant to such SEC rules and regulations. Operating results for the periods ended September 30, 2003 are not necessarily indicative of the results that may be expected for the year ending December 31, 2003.

        The balance sheet at December 31, 2002 has been derived from the audited financial statements at the date but does not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. The accompanying interim financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our Form 10-K for the year ended December 31, 2002.

        Power-One, Inc.'s ("the Company") reporting period coincides with the 52- to 53-week period ending on the Sunday closest to December 31, and its fiscal quarters are the 13- to 14-week periods ending on the Sunday nearest to March 31, June 30, September 30 and December 31. For simplicity of presentation, the Company has described the three- and nine- month periods ended September 28, 2003 as September 30, 2003. The Company has described the three- and nine- month periods ended September 29, 2002 as September 30, 2002.

NOTE 2—SIGNIFICANT ACCOUNTING POLICIES AND NEW ACCOUNTING
PRONOUNCEMENTS

        Principles of Consolidation—The accompanying consolidated financial statements include the consolidated accounts of the Company and its wholly owned subsidiaries. All significant intercompany balances and transactions have been eliminated. The Company includes in its statement of operations its pro rata share of the financial results of investments accounted for under the equity method.

        Use of Estimates in the Preparation of the Financial Statements—The preparation of the financial statements and related disclosures in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions that affect amounts reported in the consolidated financial statements and accompanying notes. Estimates are used for, but not limited to, the accounting for the allowance for doubtful accounts, inventory valuation, restructuring costs, impairment costs, depreciation and amortization, sales returns, warranty costs, taxes, and contingencies. Due to the inherent uncertainty involved in making estimates, actual results reported in future periods may differ from those estimates.

        Revenue Recognition—The Company recognizes revenue when persuasive evidence of an arrangement exists, title transfer has occurred, the price is fixed or readily determinable, and collectibility is probable. Sales are recorded net of sales returns and discounts. The Company recognizes revenue in accordance with Staff Accounting Bulletin No. 101, "Revenue Recognition in Financial Statements," (SAB 101).

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        Cash and Cash Equivalents—The Company considers all highly liquid instruments with a maturity of three months or less at purchase date to be cash equivalents.

        Accounts Receivable and Allowance for Doubtful Accounts—The Company establishes the Allowance for Doubtful Accounts using the specific identification method, and provides an estimated reserve in the aggregate.

        Inventories—The Company's inventories are stated at the lower of cost (first-in, first-out method) or market. Slow moving and obsolete inventory are written down quarterly based on a comparison of on-hand quantities to 12-month projected usages. Additionally, reserves for non-cancelable open purchase orders for parts the Company is obligated to purchase in excess of projected usage, or for open purchase orders where the market price is lower than the purchase order price, are recorded as other accrued expenses on the balance sheet.

        Investments—The Company holds minority investments in non-publicly traded companies. These investments are included in other assets on the Company's balance sheet and are accounted for under the cost or equity method depending on the nature and circumstances surrounding the investment. The Company monitors these investments for impairment and makes appropriate reductions in carrying value when necessary.

        Intangible Assets—Intangible assets include cost in excess of net assets acquired in connection with the acquisition of the Company in 1995, of Melcher AG in 1998, of IPD in 1999, and of di/dt, Inc. in 2003, which have been allocated among certain intangible items determined by management to have value, such as the Company's name, distribution network and product technology. Provision for amortization has been made based upon the estimated useful lives of the intangible asset categories, which range from three to 20 years, using the straight-line method.

        Impairment of Long-Lived Assets and Goodwill—The Company reviews the recoverability of the carrying value of long-lived assets other than goodwill using the methodology prescribed in Statement of Financial Accounting Standards (SFAS) 144, "Accounting for the Impairment and Disposal of Long-Lived Assets." The Company reviews long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying value of such assets may not be recoverable. Upon such an occurrence, recoverability of these assets is determined by comparing the forecasted undiscounted net cash flows to which the assets relate, to the carrying amount. If the asset is determined to be unable to recover its carrying value, it is written down to fair value. Fair value is determined based on discounted cash flows, appraised values or management's estimates, depending on the nature of the assets.

        The Company reviews the carrying value of goodwill using the methodology prescribed in SFAS 142, "Goodwill and Other Intangible Assets." SFAS 142 requires that the Company not amortize goodwill, but instead subject it to impairment tests on at least an annual basis and whenever circumstances suggest that goodwill may be impaired.

        Property and Equipment—Property and equipment are recorded at cost. Provision for depreciation has been made based upon the estimated useful lives of the assets, which range from three to 30 years, using principally the double declining balance and straight-line methods. Provision for amortization of

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leasehold improvements is made based upon the estimated lives of the assets or terms of the leases, whichever is shorter. Property and equipment held for sale has been classified in accordance with the provisions of SFAS 144.

        Restructuring Costs—Through December 31, 2002, the Company recorded restructuring charges in accordance with Emerging Issues Task Force (EITF) Issue 94-3, "Liability Recognition for Certain Employee Termination Benefits and Other Costs to Exit an Activity (including Certain Costs Incurred in a Restructuring)." Restructuring costs related to the downsizing of the Company's operations and primarily consisted of specific charges that had been incurred and were to be incurred with no future economic benefit. These charges included costs related to personnel severance, continuing lease obligations for vacant facilities and write-off of leasehold improvements and equipment therein, and certain contract termination penalties and other shutdown costs. Effective, January 1, 2003, the Company records restructuring charges in accordance with SFAS 146, "Accounting for Costs Associated with Disposal Activities."

        Income Taxes—Income taxes are provided for taxes currently payable or refundable, and for deferred income taxes arising from future tax consequences of events that have been recognized in the Company's financial statements or tax returns. The effects of income taxes are measured based on enacted tax laws and rates.

        Additionally, the Company's subsidiary Power-One Limited operates in the Dominican Republic in a tax-free enterprise zone and, accordingly, pays no income taxes in connection with its operations in that country. The Company has not provided for the U.S. federal and state income tax that would be paid on unremitted earnings from this or any other overseas subsidiaries, as there is no intent to remit any future earnings.

        The Company's operations in Mexico, which were closed at the end of 2002, have been subject to various income and corporate taxes on earnings generated in Mexico under the Maquiladora Program.

        Deferred Income Tax Asset Valuation Allowance—The Company records a deferred income tax asset in jurisdictions where it generates a loss for income tax purposes. The Company also records a valuation allowance against these deferred income tax assets in accordance with SFAS 109, "Accounting for Income Taxes," when, in management's judgment, the deferred income tax assets will likely not be realized in the foreseeable future.

        Stock Compensation—The Company uses the intrinsic-value method of accounting prescribed by APB Opinion No. 25, "Accounting for Stock Issued to Employees," in accounting for stock options granted to employees. Accordingly, the Company does not recognize compensation expense for stock option grants to employees in the Consolidated Statements of Operations that have been made at fair market value.

        SFAS 123, "Accounting for Stock-Based Compensation," encourages, but does not require, the recognition of compensation expense for employee stock-based compensation arrangements using the fair value method of accounting. The Company has elected the "disclosure only" alternative and has disclosed the pro forma net loss per share amounts using the fair value method. In accordance with

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SFAS No. 148, "Accounting for Stock-Based Compensation-Transition and Disclosure, an amendment of FASB Statement No. 123," the required pro forma disclosure is shown below.

        The pro forma amounts for the three- and nine- month periods ended September 30, 2003 and 2002 do not include a tax benefit on the stock compensation due to the deferred income tax valuation allowance recorded by the Company in each respective period. The fair value of each option grant is estimated on the date of grant using the Black-Scholes model, with the following assumptions used in the three- and nine- month periods ended September 30, 2003: risk-free interest rate of 3.7% and 3.4% respectively; expected volatility of 82% and 74% respectively; an expected option life of 5.9 and 6.0 years, respectively; and no expected dividends for each of the periods. The following assumptions were used in the three- and nine- month periods ended September 30, 2002: risk-free interest rate of 3.9% and 4.5% respectively; expected volatility of 109% and 85% respectively; an expected option life of 5.8 years for each of the periods; and no expected dividends for each of the periods. The aggregate fair value of stock options granted were $0.4 million and $0.2 million in the three-month periods ended September 30, 2003 and 2002, respectively, and $16.4 million and $2.4 million in the nine- month periods ended September 30, 2003 and 2002, respectively.

        In 2003, the Company granted 0.2 million restricted shares with a market value of $1.2 million to certain key employees. These shares vest ratably over eight quarters. The unvested portion of restricted shares is recorded on the balance sheet as deferred stock compensation.

        Earnings Per Share—The Company presents both basic and diluted earnings (loss) per share ("EPS") amounts. Basic EPS is calculated by dividing net income (loss) by the weighted average number of common shares outstanding during the period. Diluted EPS amounts are based upon the weighted average number of common and common equivalent shares outstanding during the period. Common equivalent shares are excluded from the computation in periods in which they have an anti-dilutive effect. The difference between basic and diluted EPS is solely attributable to stock options. The Company uses the treasury stock method to calculate the impact of stock compensation. Stock

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options for which the exercise price exceeds the average market price over the period have an anti-dilutive effect on EPS and, accordingly, are excluded from the calculation.

        Engineering—Engineering costs include existing product engineering, custom product development and research and development costs. Research and development costs are expensed in the period incurred.

        Warranties—The Company generally offers its customers a two-year warranty on all products sold, although warranty periods may vary by product type and application. Based on warranty repair costs and the estimated rate of return, the Company periodically reviews and adjusts its warranty accrual. Actual repair costs are offset against the reserve balance as incurred. The Company has adopted the disclosure requirements of Financial Accounting Standards Board ("FASB") Interpretation No. 45, "Guarantor's Accounting and Disclosure Requirements for Guarantees, Including Indirect Guarantees on Indebtedness of Others," regarding warranties.

        Derivative Instruments—The Company accounts for derivative instruments in accordance with SFAS 133, "Accounting for Derivative Instruments and Hedging Activities," and subsequent amendments, which establish accounting and reporting standards for derivative instruments, including certain derivative instruments embedded in other contracts, and for hedging activities. It requires that an entity recognize all derivatives as either assets or liabilities in the statement of financial position and measure those instruments at fair value. In addition, this statement requires hedge accounting when certain conditions are met. The Company did not hold any derivative financial instruments during 2003 and 2002.

        Concentration of Risk—Financial instruments that potentially subject the Company to concentrations of credit risk consist primarily of cash and cash equivalents placed with high credit quality institutions and trade receivables. The Company sells products and extends credit to customers, primarily in the United States, Europe and Asia; periodically monitors its exposure to credit losses; and maintains allowances for anticipated losses. Cisco Systems was the only customer to exceed 10% of net sales in the quarter and nine months ended September 30, 2003.

        Conversion of Foreign Currencies—The reporting currency for the consolidated financial statements of the Company is the U.S. dollar. The assets and liabilities of companies whose functional currency is other than the U.S. dollar are included in the consolidation by translating the assets and liabilities at the exchange rates applicable at the end of the reporting period. The statements of operations and cash flows of such companies are translated at the average exchange rates during the applicable period. Translation gains or losses are accumulated as a separate component of stockholders' equity. The Company has not tax-affected the cumulative translation adjustment as there is no intention to remit the earnings.

        Reclassifications—Certain prior year amounts have been reclassified to conform to the current year presentation.

        Segment Reporting—The Company operates as one segment in accordance with SFAS 131, "Disclosures About Segments of an Enterprise and Related Information". The Company's chief operating decision maker and management personnel view the Company's performance and make

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resource allocation decisions by looking at the Company as a whole. Although there are different divisions within the Company, they are economically similar and are also similar in terms of the five criteria set forth in SFAS 131 that must be met to combine segments. The Company's products are all power conversion products primarily geared toward the communication industry, and the sales force sells products from all divisions. The nature of the production process is similar across divisions, and manufacturing for the different divisions occurs in common facilities. Generally, the same engineers with the same qualifications design and manufacture products across divisions. The types and class of customers are similar across the divisions and product lines, and our products are distributed through common channels and distributor networks.

        Recent Pronouncements and Accounting Changes—In June 2002, the FASB issued SFAS 146, which nullifies EITF Issue No. 94-3. SFAS 146 is effective for exit and disposal activities that are initiated after December 31, 2002 and requires that a liability for a cost associated with an exit or disposal activity be recognized when the liability is incurred, in contrast to the date of an entity's commitment to an exit plan, as required by EITF Issue 94-3. The Company adopted SFAS 146 effective January 1, 2003.

NOTE 3—ACQUISITION

        On February 14, 2003, the Company completed its acquisition of di/dt Inc., a Delaware corporation based in Carlsbad, California and a technology innovator in the design and manufacture of high-density DC/DC converters used mainly in communications systems and networking environments. The Company acquired di/dt primarily for its innovative technology in the DC/DC space.

        The purchase price for di/dt was approximately $12.4 million, which consisted of the following: a $2.0 million note receivable from, as well as a $3.1 million cost basis investment in, di/dt prior to the acquisition; 1.4 million shares of the Company's common stock valued at $6.3 million; and $1.0 million in cash acquisition costs and bridge funding to di/dt. In addition to the $12.4 million purchase price, the Company agreed to pay up to an additional 1.0 million shares of Company's common stock as earn-out to former di/dt shareholders, of which 0.2 million and 0.1 million shares were distributed in May and July of 2003, respectively. The earn-out is payable in varying installments through December 31, 2004, and is contingent upon the attainment of defined operational performance and new product introduction during 2003 and 2004. Earn-out payments made are recorded as additional goodwill. In addition, the Company granted a cash bonus of approximately $1.0 million to the original founders of di/dt upon acquisition.

        The acquisition was accounted for using the purchase method of accounting, and the purchase price allocation is preliminary. The net purchase price, plus acquisition costs, was allocated to tangible assets and intangible assets. The excess of the aggregate purchase price over the estimated fair values of the net tangible assets acquired was recognized as goodwill and product technology. Product technology is being amortized over five years. The consolidated statements of operations, comprehensive income (loss) and cash flows for the three and nine months ended September 30, 2003, include three and seven months of di/dt's operations, respectively. No pro forma information is included herein, as di/dt is not material to the Company's financial position or operations.

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        Prior to the acquisition, the Company held an exclusive license from di/dt for certain current and prospective di/dt products, under which license the Company was making royalty payments to di/dt relating to sales of licensed products. Stephens, Inc., a significant shareholder of the Company, was also a significant shareholder in di/dt.

NOTE 4—INVENTORIES

        Inventories consist of the following (in millions):