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Unaudited Condensed Consolidated Statements of Stockholders’ Deficit - USD ($)
$ in Thousands
Common Stock
Additional Paid-in- Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Total
Balance at Dec. 31, 2022 $ 3 $ 190,624 $ (85,373) $ 27 $ 105,281
Balance (in Shares) at Dec. 31, 2022 19,932,429        
Exercise of common stock options 57 57
Exercise of common stock options (in Shares) 67,533        
Stock-based compensation 5,199 5,199
Conversion of 2022 Convertible Notes into common stock $ 2 40,950 40,952
Conversion of 2022 Convertible Notes into common stock (in Shares) 5,460,075        
Issuance of common stock upon the reverse capitalization, net of offering costs $ 2 4,586 4,588
Issuance of common stock upon the reverse capitalization, net of offering costs (in Shares) 13,458,293        
Reclassification of prepaid PIPE 3,500 3,500
Reclassification of prepaid PIPE (in Shares) 350,000        
Reclassification of warrants between liabilities and equity 4,329 4,329
Reclassification of Legacy Complete Solaria Common stock into SunPower Common Stock (1) 2 1
Issuance of common stock in connection with forward purchase agreements 4,777 4,777
Issuance of common stock in connection with forward purchase agreements (in Shares) 1,050,000        
Issuance of common stock in connection with forward purchase agreements due to related party $ 1 30,712 30,713
Issuance of common stock in connection with forward purchase agreements due to related party (in Shares) 4,508,488        
Issuance of common stock bonus shares in connection with Mergers 2,394 2,394
Issuance of common stock bonus shares in connection with Mergers (in Shares) 463,976        
Residual Mergers proceeds 161 161
Modification of Carlyle Warrant (10,862) (10,862)
Issuance of restricted stock units 52 52
Issuance of restricted stock units (in Shares) 98,097        
Issuance of common stock warrants (3,516) (3,516)
Issuance of common stock to related party 5,000 5,000
Issuance of common stock to related party (in Shares) 3,676,470        
Net loss (269,555) (269,555)
Foreign currency translation adjustment 116 116
Balance at Dec. 31, 2023 $ 7 277,965 (354,928) 143 $ (76,813)
Balance (in Shares) at Dec. 31, 2023 49,065,361       49,065,361
Exercise of common stock options 492 $ 492
Exercise of common stock options (in Shares) 373,003        
Stock-based compensation 4,086 4,086
Issuance of common stock warrants 1,400   1,400
Issuance of common stock warrant for services 9,179 9,179
Issuance of common stock upon conversion of SAFE Agreements with related party $ 6 6,244 6,250
Issuance of common stock upon conversion of SAFE Agreements with related party (in Shares) 13,888,889        
Exercise of common stock warrants $ 1 1
Exercise of common stock warrants (in Shares) 5,343,616        
Issuance of common stock for exchange of debt 2,670 2,670
Issuance of common stock for exchange of debt (in Shares) 1,500,000        
Vesting of restricted stock units
Vesting of restricted stock units (in Shares) 88,215        
Issuance of common stock 6,143 6,143
Issuance of common stock (in Shares) 2,718,837        
Modification of warrant agreement 7,306 7,306
Net loss (103,440) (103,440)
Foreign currency translation adjustment 22 22
Balance at Sep. 29, 2024 $ 14 315,485 (458,368) 165 (142,704)
Balance (in Shares) at Sep. 29, 2024 72,977,921        
Balance at Dec. 31, 2023 $ 7 277,965 (354,928) 143 $ (76,813)
Balance (in Shares) at Dec. 31, 2023 49,065,361       49,065,361
Exercise of common stock options 532 $ 532
Exercise of common stock options (in Shares) 398,883        
Offering costs of reverse recapitalization (1,396) (1,396)
Stock-based compensation 3,067 3,067
Issuance of common stock warrants 1,400 1,400
Issuance of common stock warrant for services 9,179 9,179
Issuance of common stock upon conversion of SAFE Agreements with related party $ 6 6,244 6,250
Issuance of common stock upon conversion of SAFE Agreements with related party (in Shares) 13,888,889        
Exercise of common stock warrants $ 1 1
Exercise of common stock warrants (in Shares) 5,343,616        
Issuance of common stock for exchange of debt 2,220 2,220
Issuance of common stock for exchange of debt (in Shares) 1,500,000        
Vesting of restricted stock units
Vesting of restricted stock units (in Shares) 669,059        
Issuance of common stock 7,144 7,144
Issuance of common stock (in Shares) 2,918,837        
Modification of warrant agreement 7,306 7,306
Net loss (56,451) (56,451)
Foreign currency translation adjustment 22 22
Balance at Dec. 29, 2024 $ 14 313,661 (411,379) 165 $ (97,539)
Balance (in Shares) at Dec. 29, 2024 73,784,645       73,784,645
Balance at Jun. 30, 2024 $ 13 288,259 (380,410) 165 $ (91,973)
Balance (in Shares) at Jun. 30, 2024 63,044,287        
Exercise of common stock options 432 432
Exercise of common stock options (in Shares) 282,966        
Stock-based compensation 1,516 1,516
Issuance of common stock warrants 1,400 1,400
Issuance of common stock warrant for services 7,759 7,759
Exercise of common stock warrants $ 1 1
Exercise of common stock warrants (in Shares) 5,343,616        
Issuance of common stock for exchange of debt 2,670 2,670
Issuance of common stock for exchange of debt (in Shares) 1,500,000        
Vesting of restricted stock units
Vesting of restricted stock units (in Shares) 88,215        
Issuance of common stock 6,143 6,143
Issuance of common stock (in Shares) 2,718,837        
Modification of warrant agreement 7,306 7,306
Net loss (77,958) (77,958)
Balance at Sep. 29, 2024 $ 14 315,485 (458,368) 165 (142,704)
Balance (in Shares) at Sep. 29, 2024 72,977,921        
Balance at Dec. 29, 2024 $ 14 313,661 (411,379) 165 $ (97,539)
Balance (in Shares) at Dec. 29, 2024 73,784,645       73,784,645
Exercise of common stock options 775 $ 775
Exercise of common stock options (in Shares) 731,671        
Stock-based compensation 8,205 8,205
Exercise of common stock warrants 60 60
Exercise of common stock warrants (in Shares) 6,000,000        
Vesting of restricted stock units
Vesting of restricted stock units (in Shares) 4,318,313        
Issuance of common stock   7,382 7,382
Issuance of common stock (in Shares) 4,333,334        
Net loss (31,199) (31,199)
Balance at Sep. 28, 2025 $ 14 330,083 (442,578) 165 $ (112,316)
Balance (in Shares) at Sep. 28, 2025 89,167,963       89,167,963
Balance at Jun. 29, 2025 $ 14 318,311 (425,674) 165 $ (107,184)
Balance (in Shares) at Jun. 29, 2025 82,325,722        
Exercise of common stock options 216 216
Exercise of common stock options (in Shares) 198,096        
Stock-based compensation 4,174 4,174
Vesting of restricted stock units
Vesting of restricted stock units (in Shares) 2,310,811        
Issuance of common stock 7,382 7,382
Issuance of common stock (in Shares) 4,333,334        
Net loss (16,904) (16,904)
Balance at Sep. 28, 2025 $ 14 $ 330,083 $ (442,578) $ 165 $ (112,316)
Balance (in Shares) at Sep. 28, 2025 89,167,963       89,167,963