Subsequent Events	12 Months Ended
Dec. 28, 2025
Subsequent Events [Abstract]
Subsequent Events	(20) Subsequent Events Amendment to White Lion SPA On January 11, 2026, the Company and White Lion entered into Amendment No. 3 (“Amendment No. 3”) to the White Lion SPA. Amendment No. 3 extends the commitment period under the White Lion SPA (the “Commitment Period”) to the earlier of December 31,2027 and the date on which White Lion has purchased an aggregate number of shares of the Company’s common stock equal to the Commitment Amount (as defined below). Further, Amendment No. 3 increases, subject to approval by the Company’s stockholders, the commitment amount under the Purchase Agreement to $55.0 million of shares of its common stock (the “Commitment Amount”), which the Company may elect to sell to White Lion pursuant to the White Lion SPA, from time to time in the Company’s sole discretion, during the Commitment Period. In addition, Amendment No. 3 adds an option for the Company to submit three hour rapid purchase notices to White Lion that, if accepted by White Lion and otherwise delivered in accordance with the Purchase Agreement, would enable the Company to sell shares of its common stock to White Lion based on the lowest traded price of the Company’s common stock during the three-hour valuation period following White Lion’s written acceptance of a three hour purchase notice. Standby Equity Purchase Agreement; Convertible Note; Convertible Debenture On January 27, 2026 (the “Effective Date”), SunPower entered into a Standby Equity Purchase Agreement (the “SEPA”) with YA II PN, LTD., a Cayman Islands exempt limited company (the “Investor”). Pursuant to the SEPA, the Investor will advance up to $20.0 million to the Company in the form of a promissory note (“Promissory Note”). Promissory Notes will accrue interest on the outstanding principal balance at an annual rate equal to 0%, which will increase to an annual rate of 18% upon the occurrence of an Event of Default (as defined in the Promissory Notes) for so long as such event remains uncured. The Promissory Notes will mature on January 27, 2027, which may be extended at the option of the Investor. The Promissory Notes are convertible into shares of the Company’s common stock. Each tranche of a Promissory Note will be advanced less a discount in the amount equal to 10% of the principal amount of such tranche. The first tranche was disbursed on January 27, 2026 in the principal amount of $1.9 million. Pursuant to the SEPA the Company will have the right, from time to time, until January 27, 2029 (unless the SEPA is terminated earlier), to require the Investor to purchase up to $25.0 million of shares of the Company’s common stock (“Commitment Amount”) subject to certain limitations and conditions set forth in the SEPA. The Company paid the Investor a structuring and due diligence fee of $0.05 million and agreed to issue to the Investor 175,000 shares of the Company’s common stock within three days of the Effective Date as a commitment fee. The SEPA will automatically terminate on the earliest to occur of (i) January 27, 2029 or (ii) the date on which the Investor has purchased from the Company under the SEPA the Commitment Amount in full. The Company may terminate the SEPA at any time upon five trading days’ prior written notice to the Investor, provided that there are no outstanding advance notices under which the Company is yet to issue shares of its common stock, there are no amounts outstanding under the Promissory Notes, and provided that the Company has paid all amounts owed to the Investor pursuant to the SEPA. The Company and the Investor may also agree to terminate the SEPA by mutual written consent. On March 6, 2026 the Company entered into a further Purchase Agreement pursuant to which the Investor purchased and the Company issued a convertible debenture in the principal amount of $10.0 million (the “Debenture”). At the closing under such purchase agreement, the Company issued the Debenture to the Investor in the original principal amount of $10.0 million for a purchase price of $9.0 million less certain fees payable under the purchase agreement. The Debenture accrues interest on the outstanding principal balance at an annual rate equal to 0%, which will increase to an annual rate of 18% upon the occurrence of an event of default under the Debenture for so long as such event remains uncured. The Debenture will mature on March 6, 2027, which may be extended at the option of the Investor. On each of May 6, 2026, June 6, 2026, July 6, 2026, August 6, 2026 and September 6, 2026 (each an “Installment Date”), the Company is required to pay an installment amount under the Debenture equal to (i) $2.0 million, plus (ii) a $0.06 million payment premium, and plus (iii) any accrued and unpaid interest (collectively, the “Installment Amount”). The Company may repay each applicable Installment Amount, at the Company’s option, (a) in cash on or before the applicable Installment Date or (b) by submitting an advance notice under the SEPA, or a combination of a payment in cash and delivery of such advance notice. At any time after the Effective Date, the Investor may convert any portion of the outstanding balance under the Debenture into shares of the Company’s common stock at a fixed price of $2.50 per share (the “Fixed Price”). Additionally, at any time on or after any Installment Date, the Investor may convert any portion of any due and unpaid Installment Amount outstanding under the Debenture into shares of the Company’s common stock at a price equal to 95% of the volume weighted average price (“VWAP”) of the common stock during the five trading days prior to the conversion date (but the conversion price will not be lower than the “Floor Price” then in effect. The Company, at its option, shall have the right to redeem early all or a portion of the amounts outstanding under the Debenture upon written notice to the Investor (an “Optional Redemption”), provided, that the Company may only deliver a notice of Optional Redemption if the VWAP of the Common Stock at the time the notice is delivered is less than the Fixed Price. In connection with an Optional Redemption, the redemption price payable by the Company will be equal to (i) the outstanding principal amount of the Debenture being redeemed, plus (ii) a payment premium equal to 3% of the principal amount being repaid, and plus (iii) accrued and unpaid interest under the Debenture; however, the prepayment premium shall not apply to any Optional Redemption of the Debenture if the redemption price is paid on or before April 30, 2026. 12.0% Convertible Promissory Note The Company received a deposit of $2.0 million from the Rodgers Revocable Trust, a related party, in the fiscal year ended December 28, 2025. In January 2026, the Company received an additional $1.3 million in proceeds from the Rodgers Revocable Trust. On January 29, 2026, the Company issued a convertible promissory note in the original principal amount of $3.3 million (the “January 2026 Note”) with respect to the aggregate proceeds received. The January 2026 Note bears an interest rate of 12.0% and is a general unsecured obligation of the Company. The January 2026 Note will mature on July 1, 2029, unless earlier converted, redeemed or repurchased. Interest on the January 2026 Note is payable semiannually in arrears on January1 and July 1 of each year, beginning on July 1, 2026. The January 2026 Note is convertible at the option of the holder at any time prior to the payment of the principal amount of the January 2026 Note in full. The conversion rate of the January 2026 Note is initially equal to 540.5405 shares of the Company’s common stock per $1,000 of principal amount due under the January 2026 Note. The conversion rate is subject to adjustment from time to time pursuant to the terms of the January 2026 Note. Acquisition of Cobalt Power Systems, Inc. On January 30, 2026, the Company entered into a share purchase agreement (“Share Purchase Agreement”) with Cobalt Power Systems, Inc., a California corporation (“Cobalt”) and its stockholders to acquire all of the outstanding stock of Cobalt (“Cobalt Acquisition”). The Company completed the Cobalt Acquisition on February 2, 2026 (“Cobalt Closing”) for (a) 1.8 million shares of the Company’s common stock issued at the Cobalt Closing and (ii) an agreement to issue an additional $3.33 million shares of the Company’s common stock on each of the 12-month and 18-month anniversaries of the Cobalt Closing. Additionally, the Company agreed to issue up to $2.0 million of restricted stock units to those Cobalt employees who continue their employment with the Company following the Cobalt Closing, and 850,000 restricted stock units will be issued as inducement grants to certain Cobalt key employees. Cobalt designs and installs solar systems. The initial accounting for the business combination is incomplete as a result of the timing of the acquisition. Amendment to Seller Note On March 5, 2026, the Company entered into an amendment of the Seller Note (“Amendment”) that if the SEPA Debenture restricts repayment of the Seller Note on May 15, 2026, then the maturity date of the Seller Note will be extended to the earlier of (a) the date that is two business days following the date on which the Seller Note may be repaid pursuant to the restrictions set forth in the SEPA Debenture and (b) September 30, 2026 (or, if the registration statement required to be filed pursuant to the Registration Rights Agreement has not been declared effective prior to April 30, 2026, then the outside maturity date will extend to December 31, 2026). Additionally, the Company and the Member agreed that the interest rate applicable to the Seller Note will increase to 10.0% per annum if the principal amount of the Seller Note remains outstanding after May 15, 2026. As an inducement to the Member’s agreement to the foregoing, the Amendment also provides that, within two business days following approval by the Company’s stockholders of the issuance of shares under the Sunder MIPA in accordance with applicable Nasdaq rules, the Company will issue the remaining shares of common stock otherwise issuable to the Member pursuant to the Sunder MIPA. On April 8, 2026, the Company issued the remaining shares due under the Seller Note, 6.7 million shares of its common stock. *Investor Deposit by a Related Party* The Company received a deposit of $5.0 million (“Purchase Amount”) from the Rodgers Revocable Trust on March 27, 2026. On April 8, 2026, the Company entered into a SAFE with the Rodgers Revocable Trust in exchange for the $5.0 million received. The SAFE is automatically convertible into equity securities of the Company in an amount equal to the Purchase Amount divided by the applicable price per share, unit or other increment of the equity securities issued by the Company in its next equity financing transaction. Conversion of September 2024 Notes Subsequent to December 28, 2025, $2.8 million of the September 2024 Notes were converted by holders into 1.6 million shares of common stock of the Company.

Subsequent Events

12 Months Ended

Dec. 28, 2025

(20) Subsequent Events

Amendment to White Lion SPA

On January 11, 2026, the Company and White Lion entered into Amendment No. 3 (“Amendment No. 3”) to the White Lion SPA. Amendment No. 3 extends the commitment period under the White Lion SPA (the “Commitment Period”) to the earlier of December 31,2027 and the date on which White Lion has purchased an aggregate number of shares of the Company’s common stock equal to the Commitment Amount (as defined below). Further, Amendment No. 3 increases, subject to approval by the Company’s stockholders, the commitment amount under the Purchase Agreement to $55.0 million of shares of its common stock (the “Commitment Amount”), which the Company may elect to sell to White Lion pursuant to the White Lion SPA, from time to time in the Company’s sole discretion, during the Commitment Period.

In addition, Amendment No. 3 adds an option for the Company to submit three hour rapid purchase notices to White Lion that, if accepted by White Lion and otherwise delivered in accordance with the Purchase Agreement, would enable the Company to sell shares of its common stock to White Lion based on the lowest traded price of the Company’s common stock during the three-hour valuation period following White Lion’s written acceptance of a three hour purchase notice.

Standby Equity Purchase Agreement; Convertible Note; Convertible Debenture

On January 27, 2026 (the “Effective Date”), SunPower entered into a Standby Equity Purchase Agreement (the “SEPA”) with YA II PN, LTD., a Cayman Islands exempt limited company (the “Investor”). Pursuant to the SEPA, the Investor will advance up to $20.0 million to the Company in the form of a promissory note (“Promissory Note”). Promissory Notes will accrue interest on the outstanding principal balance at an annual rate equal to 0%, which will increase to an annual rate of 18% upon the occurrence of an Event of Default (as defined in the Promissory Notes) for so long as such event remains uncured. The Promissory Notes will mature on January 27, 2027, which may be extended at the option of the Investor. The Promissory Notes are convertible into shares of the Company’s common stock. Each tranche of a Promissory Note will be advanced less a discount in the amount equal to 10% of the principal amount of such tranche. The first tranche was disbursed on January 27, 2026 in the principal amount of $1.9 million.

Pursuant to the SEPA the Company will have the right, from time to time, until January 27, 2029 (unless the SEPA is terminated earlier), to require the Investor to purchase up to $25.0 million of shares of the Company’s common stock (“Commitment Amount”) subject to certain limitations and conditions set forth in the SEPA.

The Company paid the Investor a structuring and due diligence fee of $0.05 million and agreed to issue to the Investor 175,000 shares of the Company’s common stock within three days of the Effective Date as a commitment fee.

The SEPA will automatically terminate on the earliest to occur of (i) January 27, 2029 or (ii) the date on which the Investor has purchased from the Company under the SEPA the Commitment Amount in full. The Company may terminate the SEPA at any time upon five trading days’ prior written notice to the Investor, provided that there are no outstanding advance notices under which the Company is yet to issue shares of its common stock, there are no amounts outstanding under the Promissory Notes, and provided that the Company has paid all amounts owed to the Investor pursuant to the SEPA. The Company and the Investor may also agree to terminate the SEPA by mutual written consent.

On March 6, 2026 the Company entered into a further Purchase Agreement pursuant to which the Investor purchased and the Company issued a convertible debenture in the principal amount of $10.0 million (the “Debenture”). At the closing under such purchase agreement, the Company issued the Debenture to the Investor in the original principal amount of $10.0 million for a purchase price of $9.0 million less certain fees payable under the purchase agreement. The Debenture accrues interest on the outstanding principal balance at an annual rate equal to 0%, which will increase to an annual rate of 18% upon the occurrence of an event of default under the Debenture for so long as such event remains uncured. The Debenture will mature on March 6, 2027, which may be extended at the option of the Investor.

On each of May 6, 2026, June 6, 2026, July 6, 2026, August 6, 2026 and September 6, 2026 (each an “Installment Date”), the Company is required to pay an installment amount under the Debenture equal to (i) $2.0 million, plus (ii) a $0.06 million payment premium, and plus (iii) any accrued and unpaid interest (collectively, the “Installment Amount”). The Company may repay each applicable Installment Amount, at the Company’s option, (a) in cash on or before the applicable Installment Date or (b) by submitting an advance notice under the SEPA, or a combination of a payment in cash and delivery of such advance notice. At any time after the Effective Date, the Investor may convert any portion of the outstanding balance under the Debenture into shares of the Company’s common stock at a fixed price of $2.50 per share (the “Fixed Price”). Additionally, at any time on or after any Installment Date, the Investor may convert any portion of any due and unpaid Installment Amount outstanding under the Debenture into shares of the Company’s common stock at a price equal to 95% of the volume weighted average price (“VWAP”) of the common stock during the five trading days prior to the conversion date (but the conversion price will not be lower than the “Floor Price” then in effect.

The Company, at its option, shall have the right to redeem early all or a portion of the amounts outstanding under the Debenture upon written notice to the Investor (an “Optional Redemption”), provided, that the Company may only deliver a notice of Optional Redemption if the VWAP of the Common Stock at the time the notice is delivered is less than the Fixed Price. In connection with an Optional Redemption, the redemption price payable by the Company will be equal to (i) the outstanding principal amount of the Debenture being redeemed, plus (ii) a payment premium equal to 3% of the principal amount being repaid, and plus (iii) accrued and unpaid interest under the Debenture; however, the prepayment premium shall not apply to any Optional Redemption of the Debenture if the redemption price is paid on or before April 30, 2026.

12.0% Convertible Promissory Note

The Company received a deposit of $2.0 million from the Rodgers Revocable Trust, a related party, in the fiscal year ended December 28, 2025. In January 2026, the Company received an additional $1.3 million in proceeds from the Rodgers Revocable Trust. On January 29, 2026, the Company issued a convertible promissory note in the original principal amount of $3.3 million (the “January 2026 Note”) with respect to the aggregate proceeds received.

The January 2026 Note bears an interest rate of 12.0% and is a general unsecured obligation of the Company. The January 2026 Note will mature on July 1, 2029, unless earlier converted, redeemed or repurchased. Interest on the January 2026 Note is payable semiannually in arrears on January1 and July 1 of each year, beginning on July 1, 2026. The January 2026 Note is convertible at the option of the holder at any time prior to the payment of the principal amount of the January 2026 Note in full. The conversion rate of the January 2026 Note is initially equal to 540.5405 shares of the Company’s common stock per $1,000 of principal amount due under the January 2026 Note. The conversion rate is subject to adjustment from time to time pursuant to the terms of the January 2026 Note.

Acquisition of Cobalt Power Systems, Inc.

On January 30, 2026, the Company entered into a share purchase agreement (“Share Purchase Agreement”) with Cobalt Power Systems, Inc., a California corporation (“Cobalt”) and its stockholders to acquire all of the outstanding stock of Cobalt (“Cobalt Acquisition”). The Company completed the Cobalt Acquisition on February 2, 2026 (“Cobalt Closing”) for (a) 1.8 million shares of the Company’s common stock issued at the Cobalt Closing and (ii) an agreement to issue an additional $3.33 million shares of the Company’s common stock on each of the 12-month and 18-month anniversaries of the Cobalt Closing. Additionally, the Company agreed to issue up to $2.0 million of restricted stock units to those Cobalt employees who continue their employment with the Company following the Cobalt Closing, and 850,000 restricted stock units will be issued as inducement grants to certain Cobalt key employees. Cobalt designs and installs solar systems. The initial accounting for the business combination is incomplete as a result of the timing of the acquisition.

Amendment to Seller Note

On March 5, 2026, the Company entered into an amendment of the Seller Note (“Amendment”) that if the SEPA Debenture restricts repayment of the Seller Note on May 15, 2026, then the maturity date of the Seller Note will be extended to the earlier of (a) the date that is two business days following the date on which the Seller Note may be repaid pursuant to the restrictions set forth in the SEPA Debenture and (b) September 30, 2026 (or, if the registration statement required to be filed pursuant to the Registration Rights Agreement has not been declared effective prior to April 30, 2026, then the outside maturity date will extend to December 31, 2026). Additionally, the Company and the Member agreed that the interest rate applicable to the Seller Note will increase to 10.0% per annum if the principal amount of the Seller Note remains outstanding after May 15, 2026. As an inducement to the Member’s agreement to the foregoing, the Amendment also provides that, within two business days following approval by the Company’s stockholders of the issuance of shares under the Sunder MIPA in accordance with applicable Nasdaq rules, the Company will issue the remaining shares of common stock otherwise issuable to the Member pursuant to the Sunder MIPA. On April 8, 2026, the Company issued the remaining shares due under the Seller Note, 6.7 million shares of its common stock.

Investor Deposit by a Related Party

The Company received a deposit of $5.0 million (“Purchase Amount”) from the Rodgers Revocable Trust on March 27, 2026. On April 8, 2026, the Company entered into a SAFE with the Rodgers Revocable Trust in exchange for the $5.0 million received. The SAFE is automatically convertible into equity securities of the Company in an amount equal to the Purchase Amount divided by the applicable price per share, unit or other increment of the equity securities issued by the Company in its next equity financing transaction.

Conversion of September 2024 Notes

Subsequent to December 28, 2025, $2.8 million of the September 2024 Notes were converted by holders into 1.6 million shares of common stock of the Company.