Exhibit 99.1

UNAUDITED PRO FORMA

COMBINED FINANCIAL INFORMATION

The following unaudited pro forma combined statement of operations is derived from the historical consolidated financial statements of SunPower Inc. and Subsidiaries (the “Company”, “SunPower”), the historical financial statements of Sunder Energy, LLC (“Sunder”) and the historical financial statements of Ambia Energy LLC (“Ambia”) and reflects (1) the acquisition of Ambia which closed on November 21, 2025 (the “Ambia Acquisition”), (2) the acquisition of Sunder which closed on September 24, 2025 (the “Sunder Acquisition” and collectively with the Ambia Acquisition and Sunder Acquisition “Acquisitions”) and (3) the financing of the Sunder Acquisition (the “Financing”).

The unaudited pro forma combined financial information related to the Acquisitions has been prepared by the Company using the acquisition method of accounting in accordance with GAAP. The Company has been treated as the acquirer for accounting purposes and thus accounts for the Acquisitions as a business combination in accordance with Accounting Standards Codification (“ASC”) Topic 805, Business Combinations (“ASC 805”). The estimated fair values of the assets acquired and liabilities assumed and the related purchase price allocation for both Ambia and Sunder are provisional and have been made solely for the purpose of providing unaudited pro forma combined financial information.

The unaudited pro forma combined statements of operations for the year ended December 28, 2025 combine the historical statements of operations of the Company, Sunder and Ambia on a pro forma basis as if the Acquisitions and the Financing had been consummated on January 1, 2025, the beginning of the earliest period presented. An unaudited combined balance sheet is not presented as the Acquisitions and the Financing have been reflected in the Company’s balance as of March 29, 2026, included in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended March 29, 2026 filed with the SEC on May 19, 2026.

The unaudited pro forma combined financial information does not give effect to any cost savings, operating synergies or revenue synergies that may result from the Acquisitions.

The unaudited pro forma combined statement of operations has been developed from and should be read in conjunction with:

Assumptions and estimates underlying the unaudited pro forma adjustments set forth in the unaudited pro forma combined statement of operations are described in the accompanying notes. The unaudited pro forma combined statement of operations has been presented for illustrative purposes only and are not necessarily indicative of the operating results and financial position that would have been achieved had the Acquisition and Financing occurred on the dates indicated. Further, the unaudited pro forma combined financial statements do not purport to project the future operating results or financial position of SunPower following the completion of the Acquisitions. The unaudited pro forma adjustments represent management’s estimates based on information available as of the date of these unaudited pro forma combined financial statements and are subject to change as additional information becomes available and analyses are performed.

UNAUDITED PRO FORMA COMBINED STATEMENT OF OPERATIONS

FOR THE YEAR ENDED DECEMBER 28, 2025

(In thousands, except shares and per share data)

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

Notes to Unaudited Pro Forma Combined Financial Statements

The unaudited pro forma combined financial information was prepared in accordance with Article 11 of Regulation S-X, and presents the pro forma results of operations of the Company based on the historical financial information of the Company, Sunder and Ambia after giving effect to the Acquisitions, the Financing, and reclassifications as set forth in the notes to the unaudited pro forma combined financial information.

The unaudited pro forma combined financial information does not reflect any management adjustments for expected effects of the Acquisitions.

The unaudited pro forma combined statements of operations for the year ended December 28, 2025, combine the historical statements of operations of the Company, Sunder and Ambia on a pro forma basis as if the Sunder and Ambia Acquisitions and the financing of the Sunder Acquisition had been consummated on January 1, 2025, the beginning of the earliest period presented.

Sunder Acquisition

On September 21, 2025, the Company entered into a Membership Interest Purchase Agreement (“MIPA”) with Sunder Energy LLC (“Sunder” or “Sunder Acquisition”) and the seller, Chicken Parm Pizza LLC (“Seller/Member”), the sole member of Sunder. The acquisition of Sunder was completed in the Company’s third fiscal quarter on September 24, 2025, and the financial results of Sunder have been included in the Company’s unaudited condensed consolidated financial statements since the date of acquisition.

Per the terms of the MIPA, the Company acquired all of the outstanding membership interest of Sunder for (1) $20.7 million in cash, subject to certain working capital and other adjustments; (2) a promissory note to the Member in the principal amount of $20.0 million (“Seller Note”); (3) and 10.0 million shares of the Company’s common stock (valued at the closing share price on September 24, 2025, of $1.71 per share).

The total consideration is summarized as follows (in thousands except share data): 

The fair values of assets acquired and liabilities assumed are based upon a provisional valuation of the assets acquired and liabilities assumed, and the Company’s estimates and assumptions are subject to change within the measurement period. Finalization of the fair values remains open for the components of working capital, identification and valuation of intangibles and allocation of goodwill.

The following table summarizes the provisional fair value of identifiable assets acquired and liabilities assumed (in thousands):

Goodwill represents the excess of the estimated consideration transferred over the fair value of the net tangible and intangible assets acquired that is associated with the excess cash flows that the acquisition is expected to generate in the future.

Ambia Acquisition

On November 21, 2025, the Company entered into a Membership Interest Purchase Agreement (the “Membership Interest Purchase Agreement”) with Ambia and Ambia Holdings, Inc., a Delaware corporation and the sole member of Ambia (“Ambia Holdings”). Ambia was the sole operating entity within Ambia Holdings.

The Company, Ambia and Ambia Holdings completed the closing under the Membership Interest Purchase Agreement (the “Ambia Closing”) on November 21, 2025. At the Ambia Closing, the Company acquired all of the outstanding membership interests of Ambia from Ambia Holdings for: (a) 10,243,924 shares (the “Ambia Closing Consideration Shares”) of common stock of the Company, issued at the Ambia Closing to Ambia Holdings; and (b) the agreement to issue an additional $9.375 million of shares of the Company’s common stock on each of the six-month anniversary of the Ambia Closing and the 12-month anniversary of the Ambia Closing (such additional shares of common stock, the “Deferred Ambia Consideration Shares”). The issuance of the Deferred Ambia Consideration Shares is subject to approval by the Company’s stockholders following the Closing in accordance with the rules and regulations of the Nasdaq Stock Market (including Nasdaq Listing Rule 5635(a)).

The actual number of Deferred Ambia Consideration Shares issuable by the Company on the six- and 12-month anniversaries of the Closing will be determined based on the 20-day trailing volume-weighted average price of the Common Stock after market close on the business day immediate prior to the issuance date of the applicable shares (the “VWAP Value”); provided that the VWAP Value for the calculation of the actual number of Deferred Ambia Consideration Shares issuable by the Company will not be more than $2.8102 per share or less than $1.4988 per share. Additionally, the number of Deferred Ambia Consideration Shares issuable by the Company is subject to adjustment pursuant to customary working capital and balance sheet adjustment terms and subject to offset for certain indemnifiable damages in accordance with the Membership Interest Purchase Agreement.

The Company’s closing share price for its common stock of $1.61 on November 21, 2025 was used to fair value the shares issued at the Ambia Closing.. The Fair value of contingent consideration was $16,879 as of December 28, 2025. The total consideration is summarized as follows (in thousands): 

Financing of the Acquisitions

Sunder Acquisition

The acquisition of Sunder was financed as follows: (i) on September 21, 2025, the Company issued $22.0 million of 7% senior unsecured convertible notes (the “September 2025 Notes”), (ii) at closing on September 24, 2025, the Company issued a $20.0 million note to the sellers of Sunder (the “Seller Note”) and (iii) also at closing the Company agreed to issue 10.0 million shares of the Company’s stock which had a fair value of $17.1 million at the closing date of the Sunder acquisition.

The September 2025 Notes were issued pursuant to an Indenture agreement with U.S. Bank Trust Company, National Association, as trustee (the “Indenture”). The September 2025 Notes issued under the Indenture bear interest at 7.0% per annum, and the interest is payable semiannually in arrears on January 1 and July 1 of each year beginning on January 1, 2025. The principal is payable in full at maturity on July 1, 2029. The September 2025 Notes are convertible into shares of the Company’s common stock at the option of the holder at a conversion rate of $2.14 per common share. Holders of the September 2025 Notes may convert at any time. The September 2025 Notes may be declared due and payable at the option of the holder upon an event of default and upon a qualifying change of control event.

The Seller Note has an original principal amount of $20.0 million. The Seller Note bears interest at 7.0% per annum, compounded at the end of each calendar quarter. Interest is due and payable concurrent with the payment of the principal balance. The maturity date under the Seller Note is the earlier of (i) May 15, 2026 and (ii) the date on which all amounts under the Seller Note otherwise become due and payable following an event of default. The Seller Note must also be repaid in the event of a change of control of the Company or the sale of all or substantially all of the consolidated assets of the Company and its subsidiaries. The Company concluded that since the sellers joined the Company and have a level of influence that is not insignificant, they are related parties of the Company and therefore the Seller Note is a related party obligation.

The Sunder Acquisition was also financed through the issuance of shares of the Company’s common stock. The Company agreed to issue 10.0 million shares of the Company’s common stock (valued at the closing share price on September 24, 2025, of $1.71 per share). At closing the Company issued 3,333,334 shares of the Company’s common stock and subject to approval of such issuances by the Company’s stockholders, the Company will issue an additional 3,333,333 shares of the Company’s common stock to be issued on the 12-month anniversary of the Closing and (y) a further 3,333,333 shares of the Company’s common stock to be issued on the 18-month anniversary of the Closing (“Deferred Consideration Shares”). In lieu of issuing the Deferred Consideration Shares, the Company, in its sole discretion, may elect to pay the Member a cash payment equal to the number of Deferred Consideration Shares otherwise issuable by the Company multiplied by the volume-weighted average price of the Company’s common stock as quoted on Nasdaq for the 30-trading day period ending two business days prior to the date on which the applicable Deferred Consideration Shares were otherwise issuable (“Cash in Lieu Amount”). If the Company elects to pay the Cash in Lieu Amount, 50% of the Cash in Lieu Amount will be paid on the three-month anniversary of the date on which the applicable Deferred Consideration Shares were otherwise issuable, with the remaining 50% of the Cash in Lieu Amount payable on the 6 month anniversary of the date on which the applicable Deferred Consideration Shares were otherwise issuable. The shares of the Company’s common stock were valued at $17.1 million at the date of acquisition. The transaction adjustments within the pro forma results of operations for the year ended December 28, 2025 present the shares of common stock issuable in connection with the Sunder acquisition period.

Ambia Acquisition

The Ambia Acquisition was consummated through the issuance of shares of the Company’s common stock. At the Ambia Closing the Company paid initial consideration through the issuance of 10,243,924 shares of the Company’s common stock, a non-cash transaction. The Deferred Ambia Consideration Shares will also be paid in shares of the Company’s common stock.

The historical pro forma results of Sunder for the period January 1, 2025 through September 23, 2025 were derived from the unaudited financial statements for the six months ended June 30, 2025 and interim results of operations for the period from July 1, 2025 through September 23, 2025 as follows (in thousands):

The historical pro forma results of Ambia for the period January 1, 2025 through November 20, 2025 were derived from the unaudited financial statements for the nine months ended September 30, 2025 and interim results of operations for the period from October 1, 2025 through November 20, 2025 as follows (in thousands):

The pro forma adjustments included in the unaudited pro forma combined statements of operations for the year ended December 28, 2025, are as follows:

Intangible assets are amortized on a straight-line basis. This transaction adjustment reflects the pro forma amortization expense for the period from January 1, 2025 to September 23, 2025, the acquisition date. The components of the pro forma amortization expense are as noted below (in thousands):

The above estimates of intangible assets’ fair values and useful lives are provisional and subject to change upon finalization of the fair values of the assets acquired.

Intangible assets are amortized on a straight-line basis. This transaction adjustment reflects the pro forma amortization expense for the period from January 1, 2025 to November 20, 2025, the acquisition date. The components of the pro forma amortization expense are as noted below (in thousands):

The transaction adjustment of $2.7 million includes an accounting adjustment to eliminate the historical interest expense of $0.2 million, as Sunder was acquired in a debt free transaction.