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Other Expense, Net (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 28, 2025 | Dec. 29, 2024
Other Expense, Net [Abstract] |  |
Schedule of Other Expense, Net | Other expense, net consists of the following (in thousands):
|  | Thirteen Weeks Ended |  |  | Thirty-Nine Weeks Ended |
|  | September 28, 2025 |  |  | September 29, 2024 |  |  | September 28, 2025 |  |  | September 29, 2024 |
Loss on issuance of derivative liabilities(1) |  | $ | — |  |  | $ | (24,688 | ) |  | $ | — |  |  | $ | (24,688 | )
Change in fair value of derivative liabilities(2) |  |  | (2,034 | ) |  |  | (37,875 | ) |  |  | 1,639 |  |  |  | (37,875 | )
Change in fair value of forward purchase agreement liabilities(3) |  |  | (2,420 | ) |  |  | 7,728 |  |  |  | (807 | ) |  |  | 4,906 |
Change in fair value of SAFE Agreement with related party |  |  | (79 | ) |  |  | (900 | ) |  |  | (113 | ) |  |  | (900 | )
Change in fair value of FACT public, private placement and working capital warrants |  |  | (78 | ) |  |  | (6,052 | ) |  |  | (3,122 | ) |  |  | (6,295 | )
Change in fair value of Carlyle Warrants with related party |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,869 |
Change in fair value of redeemable convertible preferred stock warrant liability |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 1,310 |
Loss on conversion of SAFE Agreements to common stock with related party |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (1,250 | )
Other financing costs |  |  | — |  |  |  | (3,812 | ) |  |  | — |  |  |  | (3,812 | )
Other, net(4) |  |  | 355 |  |  |  | (85 | ) |  |  | 679 |  |  |  | (499 | )
Total Other Expense, net |  | $ | (4,256 | ) |  | $ | (65,684 | ) |  | $ | (1,724 | ) |  | $ | (66,234 | )
(1) | Includes $3.0 million of related party expense in each of the thirteen and thirty-nine week periods ended September 29, 2024.
(2) | Includes a loss of $0.3 million and a gain of $1.8 million due to related parties in the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Includes a loss of $22.8 million due to related parties in each of the thirteen and thirty-nine week periods ended September 29, 2024. Refer to Note 9 – Borrowings and Derivative Liabilities for details.
(3) | Includes a gain of zero and $0.1 million due to related parties for the thirteen and thirty-nine week periods ended September 28, 2025, respectively. Includes a gain from related parties of $2.8 million and $1.8 million due to related parties in the thirteen and thirty-nine week periods ended September 29, 2024, respectively.
(4) | Includes zero and $0.1 million of income due to related parties in the thirteen and thirty-nine week periods ended September 28, 2025, respectively.
| Other income (expense), net consist of the following (in thousands):
|  | Fiscal Year Ended |
|  | December 29, |  |  | December 31, |
|  | 2024 |  |  | 2023 |
Change in fair value of redeemable convertible preferred stock warrant liability |  | $ | 1,310 |  |  | $ | 8,513 |
Change in fair value of Carlyle Warrants (1) |  |  | 2,869 |  |  |  | 14,373 |
Change in fair value of FACT public, private placement and working capital warrants |  |  | (1,258 | ) |  |  | 6,424 |
Loss on conversion of SAFE agreements to common stock with related party |  |  | (1,250 | ) |  |  | - |
Change in fair value of SAFE Agreement with related party |  |  | 616 |  |  |  | - |
Loss on sale of equity securities |  |  | - |  |  |  | (4,154 | )
Loss on CS Solis debt extinguishment |  |  | - |  |  |  | (10,338 | )
Bonus shares issued in connection with the Mergers (2) |  |  | - |  |  |  | (2,394 | )
Issuance of forward purchase agreements (3) |  |  | - |  |  |  | 76 |
Change in fair value of forward purchase agreement liabilities (4) |  |  | 337 |  |  |  | (3,906 | )
Loss on issuance of shares in connection with the forward purchase agreements (5) |  |  | - |  |  |  | (35,490 | )
Loss on discontinued Solaria business and other, net |  |  | - |  |  |  | (2,966 | )
Loss on issuance of derivative liability (6) |  |  | (24,688 | ) |  |  | - |
Gain on remeasurement of derivative liabilities (7) |  |  | 33,986 |  |  |  | - |
Other financing costs |  |  | (3,769 | ) |  |  | - |
Other, net |  |  | (221 | ) |  |  | - |
Total Other income (expense), net |  | $ | 7,932 |  |  | $ | (29,862 | )
(1) | Deemed to be a related party in the fiscal year ended December 29, 2024. Refer to Note 15 - Borrowings and Derivative Liabilities for details.
(2) | Includes $0.7 million of other expense for the fiscal year ended December 31, 2023, for bonus shares issued to related parties in connection with the Mergers.
(3) | Includes $0.4 million of other income for the fiscal year ended December 31, 2023, for forward purchase agreements entered into with related parties.
(4) | Includes income of $0.1 million and $9.1 million of other expenses for the fiscal years ended December 29, 2024, and December 31, 2023, for the change in fair value of FPAs entered into with related parties.
(5) | Includes $30.7 million of other expense the fiscal year ended December 31, 2023 for shares issued to related parties in connection with the forward purchase agreements.
(6) | Includes a loss of $3.0 million on the issuance of a derivative liability with a related party in the fiscal year ended December 29, 2024. Refer to Note 15 - Borrowings and Derivative Liabilities for details.
(7) | Includes a gain of $0.3 million on the change in the fair value of derivative liabilities with related parties in the fiscal year ended December 29, 2024. Refer to Note 15 - Borrowings and Derivative Liabilities for details.

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- Definition Tabular disclosure of the components of non-operating income or non-operating expense that may include amounts earned from dividends, interest on securities, gains (losses) on securities sold, equity earnings of unconsolidated affiliates, net gain (loss) on sales of business, interest expense and other miscellaneous income or expense items. + References No definition available. + Details
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