v3.26.1
Fair Value Measurements (Tables)
3 Months Ended 12 Months Ended
Mar. 29, 2026
Dec. 28, 2025
Fair Value Measurements [Abstract]    
Schedule of Financial Assets and Liabilities that are Measured at Fair Value on a Recurring Basis

The following table sets forth the Company’s financial assets and liabilities that are measured at fair value on a recurring basis (in thousands):

 

    As of March 29, 2026  
    Level 1     Level 2     Level 3     Total  
Financial Assets                        
Restricted cash   $ 1,134     $     $     $ 1,134  
Total   $ 1,134     $     $     $ 1,134  
Financial Liabilities                                
July 2024 Notes derivative liability (1)   $     $     $ 14,042     $ 14,042  
July 2024 Notes derivative liability – related parties (1)                 9,036       9,036  
September 2024 Notes derivative liability (1)                 26,351       26,351  
September 2024 Notes derivative liability – related parties (1)                 4,286       4,286  
July 2025 Note derivative liability– related party (1)                 2,239       2,239  
September 2025 Notes derivative liability (1)                 10,825       10,825  
November 2025 Note derivative liability – related party (1)                 1,069       1,069  
January 2026 Note derivative liability – related party                     1,467       1,467  
$1.9 Million Note                     1,530       1,530  
March 2026 Bridge Note                     9,500       9,500  
Forward purchase agreement liabilities                 5,107       5,107  
SAFE Agreement with related party                 579       579  
Private placement warrants                 1,504       1,504  
Working capital warrants                 172       172  
Public warrants     2,070                   2,070  
Deferred Cobalt Consideration Shares                 6,331       6,331  
Deferred Ambia Consideration Shares                 13,936       13,936  
Total   $ 2,070     $     $ 107,974     $ 110,044  
    As of December 28, 2025  
    Level 1     Level 2     Level 3     Total  
Financial Assets                        
Restricted cash   $ 3,841     $     $     $ 3,841  
Total   $ 3,841     $     $     $ 3,841  
Financial Liabilities                                
July 2024 Notes derivative liability (1)   $     $     $ 19,604     $ 19,604  
July 2024 Notes derivative liability – related parties (1)                 12,615       12,615  
September 2024 Notes derivative liability (1)                 37,930       37,930  
September 2024 Notes derivative liability – related parties (1)                 5,870       5,870  
July 2025 Note derivative liability– related party (1)                 3,246       3,246  
September 2025 Notes derivative liability (1)                 14,756       14,756  
November 2025 Note derivative liability – related party (1)                 1,488       1,488  
Forward purchase agreement liabilities                 3,965       3,965  
SAFE Agreement with related party                 535       535  
Private placement warrants                 1,692       1,692  
Working capital warrants                 194       194  
Public warrants     2,475                   2,475  
Deferred Sunder Consideration Shares     10,840                   10,840  
Deferred Ambia Consideration Shares                 16,879       16,879  
Total   $ 13,315     $     $ 118,774     $ 132,089  

 

(1) The derivative liabilities are associated with the Company’s outstanding senior unsecured convertible notes with stated interest rates of 7.0% (the “September 2024 Notes” and “September 2025 Notes”) and 12.0% (the “July 2024 Notes”, “July 2025 Note”, “November 2025 Note” and “January 2026 Note”) all of which are defined in Note 9 – Borrowings and Derivative Liabilities.

The following tables set forth the Company’s financial assets and liabilities that are measured at fair value, on a recurring basis (in thousands):

 

    As of December 28, 2025  
    Level 1     Level 2     Level 3     Total  
Financial Assets                        
Restricted cash   $ 3,841     $
    $
    $ 3,841  
Total   $ 3,841     $
    $
    $ 3,841  
Financial Liabilities                                
July 2024 Notes derivative liability (1)   $
    $
    $ 19,604     $ 19,604  
July 2024 Notes derivative liability – related parties (1)    
     
      12,615       12,615  
September 2024 Notes derivative liability (1)    
     
      37,930       37,930  
September 2024 Notes derivative liability – related parties (1)    
     
      5,870       5,870  
July 2025 Note derivative liability– related party (1)    
     
      3,246       3,246  
September 2025 Notes derivative liability (1)    
     
      14,756       14,756  
November 2025 Note derivative liability – related party (1)    
     
      1,488       1,488  
Forward purchase agreement liabilities    
     
      3,965       3,965  
SAFE Agreement with related party    
     
      535       535  
Private placement warrants    
     
      1,692       1,692  
Working capital warrants    
     
      194       194  
Public warrants     2,475      
     
      2,475  
Deferred Sunder Consideration Shares     10,840      
     
      10,840  
Deferred Ambia Consideration Shares          
      16,879       16,879  
Total   $ 13,315     $
    $ 118,774     $ 132,089  

 

    As of December 29, 2024  
    Level 1     Level 2     Level 3     Total  
Financial Assets                        
Restricted cash   $ 3,841     $     $     $ 3,841  
Total   $ 3,841     $     $     $ 3,841  
Financial Liabilities                                
July 2024 Notes derivative liability (1)   $     $     $ 13,563     $ 13,563  
July 2024 Notes derivative liability – related parties (1)                 21,127       21,127  
September 2024 Notes derivative liability (1)                 55,474       55,474  
September 2024 Notes derivative liability – related parties (1)                 6,958       6,958  
Forward purchase agreement liabilities (2)                 3,494       3,494  
SAFE Agreement with related party                 384       384  
Private placement warrants                 627       627  
Working capital warrants                 72       72  
Public warrants     862                   862  
Total   $ 862     $     $ 101,699     $ 102,561  

 

(1) The derivative liabilities are associated with the Company’s outstanding senior unsecured convertible notes with stated interest rates of 7.0% (the “September 2024 Notes” and “September 2025 Notes”) and 12.0% (the “July 2024 Notes”, “July 2025 Note”, and “November 2025 Note”) all of which are defined in Note 10 – Borrowings and Derivative Liabilities.
   
(2) Includes $1.3 million due to related parties as of and December 29, 2024.
Schedule of Liabilities by Class and Categorized Within Level 3 Under the Fair Value Hierarchy

The reconciliation of liabilities by class and categorized within Level 3 under the fair value hierarchy is as follows for the thirteen week periods ended March 29, 2026 and March 30, 2025 (in thousands):

 

          Thirteen Weeks Ended March 29, 2026  
    Derivative
liabilities
    Convertible
debt at fair
value
    Forward
purchase
agreements
    SAFE
Agreements
    Warrant
liabilities
    Deferred
Consideration
Shares
    Total  
Balance as of December 28, 2025   $ 95,509     $     $ 3,965     $ 535     $ 1,886     $ 16,879     $ 118,774  
Additions     2,297       10,710                         6,331       19,338  
Conversions     (1,883 )                                   (1,883 )
Net (gain) loss recognized within Other non-operating income, net in the consolidated statement of operations     (26,608 )     320       1,142       44       (210 )     (2,943 )     (28,255 )
Balance as of March 29, 2026   $ 69,315     $ 11,030     $ 5,107     $ 579     $ 1,676     $ 20,267     $ 107,974  

 

    Thirteen Weeks Ended March 30, 2025  
    Derivative
liabilities
    Forward
purchase
agreements
    SAFE
Agreements
    Warrant
liabilities
    Total  
Balance as of December 29, 2024   $ 97,122     $ 3,494     $ 384     $ 699     $ 101,699  
Additions                              
Conversions                              
Net (gain) loss recognized within Other non-operating income, net in the consolidated statement of operations     (15,127 )     (268 )     20       488       (14,887 )
Balance as of March 30, 2025   $ 81,995     $ 3,226     $ 404     $ 1,187     $ 86,812  

The reconciliation of liabilities by class and categorized within Level 3 under the fair value hierarchy is as follows for the fiscal years ended December 28, 2025 and December 29, 2024 (in thousands):

 

    Fiscal Year Ended December 28, 2025  
    Derivative liabilities     Forward Purchase Agreements     SAFE Agreements     Warrant liabilities     Deferred Ambia Consideration Shares     Total  
Balance as of December 29, 2024   $ 97,122     $ 3,494     $ 384     $ 699     $
    $ 101,699  
Additions     20,808      
     
     
      16,879       37,687  
Conversions     (10,931 )    
     
     
     
      (10,931 )
Net (gain)/loss recognized within Other non-operating income, net in the consolidated statement of operations     (11,490 )     471       151       1,187      
      (9,681 )
Balance as of December 28, 2025   $ 95,509     $ 3,965     $ 535     $ 1,886     $ 16,879     $ 118,774  

 

    Fiscal Year Ended December 29, 2024  
    Derivative
liabilities
    Forward
Purchase
Agreements
    SAFE
Agreements
    Warrant
liabilities
    Total  
Balance as of December 31, 2023   $
    $ 3,831     $
    $ 10,960     $ 14,791  
Additions     131,108      
      6,000      
      137,108  
Conversions    
     
      (6,250 )     (7,306 )     (13,556 )
Net (gain)/loss recognized within Other non-operating income, net in the consolidated statement of operations     (33,986 )     (337 )     634       (2,955 )     (36,644 )
Balance as of December 29, 2024   $ 97,122     $ 3,494     $ 384     $ 699     $ 101,699  
Schedule of Derivative Liabilities

The assumptions used to value the derivative liabilities as of March 29, 2026 were as follows:

 

     12.0% Senior Unsecured Convertible Notes     7.0% Senior Unsecured
Convertible Notes
 
    July
2024
Notes(1)
    July
2025
Note
     November
2025
Note
    January
2026
Note
    September
2024
Notes(1)
    September
2025
Notes(1)
 
Coupon rate     12.0 %     12.0 %     12.0 %   $ 12.0 %     7.0 %     7.0 %
Initial conversion rate     595.24       558.66       626.96       540.54       467.84       467.84  
Initial conversion price   $ 1.68     $ 1.79     $ 1.60     $ 1.85     $ 2.14     $ 2.14  
Common stock price   $ 1.25     $ 1.25     $ 1.25     $ 1.25     $ 1.25     $ 1.25  
Risk-free interest rate     4.00 %     4.00 %     3.96 %     4.00 %     3.96 %     3.96 %
Volatility     88.1 %     88.8 %     87.5 %     89.2 %     90.7 %     90.7 %
Dividend yield     0.00 %     0.00 %     0.00 %     0.00 %     0.00 %     0.00 %

 

The assumptions used to value the derivative liabilities as of December 28, 2025 were as follows:

 

    12.0% Senior Unsecured Convertible Notes     7.0% Senior Unsecured
Convertible Notes
 
    July
2024
Notes(1)
    July
2025
Note
    November
2025
Note
    September
2024
Notes(1)
    September
2025
Notes(1)
 
Coupon rate     12.0 %     12.0 %     12.0 %     7.0 %     7.0 %
Initial conversion rate     595.24       558.66       626.96       467.84       467.84  
Initial conversion price   $ 1.68     $ 1.79     $ 1.60     $ 2.14     $ 2.14  
Common stock price   $ 1.62     $ 1.62     $ 1.62     $ 1.62     $ 1.62  
Risk-free interest rate     3.6 %     3.6 %     3.6 %     3.58 %     3.58 %
Volatility     82.2 %     83.2 %     81.3 %     85.6 %     85.6 %
Dividend yield     0.00 %     0.00 %     0.00 %     0.00 %     0.00 %

 

(1) The conversion option is derived based upon the above assumptions plus a make-whole provision which is based upon changes in the Company’s stock price and the conversion date.

The assumptions used to value the derivative liabilities as of December 28, 2025 were as follows:

 

    12.0% Senior Unsecured Convertible Notes     7.0% Senior Unsecured Convertible Notes  
    July 2024 Notes     July 2025 Note     November 2025 Note     September 2024 Notes     September 2025 Notes  
Coupon rate     12.0 %     12.0 %     12.0 %     7.0 %     7.0 %
Conversion rate     595.24       558.66       626.96       467.84       467.84  
Conversion price   $ 1.68     $ 1.79     $ 1.60     $ 2.14     $ 2.14  
Common stock price   $ 1.62     $ 1.62     $ 1.62     $ 1.62     $ 1.62  
Risk-free interest rate     3.6 %     3.6 %     3.6 %     3.58 %     3.58 %
Volatility     82.2 %     83.2 %     81.3 %     85.6 %     85.6 %
Dividend yield     0.00 %     0.00 %     0.00 %     0.00 %     0.00 %

 

The assumptions used to value the derivative liabilities as of December 29, 2024 were as follows:

 

    Senior Unsecured Convertible Notes  
    12.0% Notes     7.0% Notes  
    July 2024 Notes     September 2024 Notes  
Coupon rate     12.0 %     7.0 %
Conversion rate     595.24       467.84  
Conversion price   $ 1.68     $ 2.14  
Common stock price   $ 1.81     $ 1.81  
Risk-free interest rate     4.43 %     4.43 %
Volatility     62.0 %     66.6 %
Dividend yield     0.00 %     0.00 %
Schedule of Key Inputs for the Simulation Include Stock Price

The key inputs for the simulation include stock price, simulation period and volatility of the Company’s common stock and were as follows as of March 29, 2026:

 

    $1.9 Million
Note
    March 2026
Bridge Note
 
VWAP stock price   $ 1.24     $ 1.24  
Simulation period     0.83 years       0.94 years  
Risk-free rate     3.76 %     3.77 %
Volatility     81.4 %     83.3 %
Credit risk-adjusted rate     41.4 %     73.4 %

The Company valued the private placement and working capital warrants, based on a binomial lattice model, which included the following inputs:

 

    As of  
    March 29,     December 28,  
    2026     2025  
Expected term     2.31 years       2.56 years  
Stock price   $ 1.25     $ 1.62  
Exercise price   $ 11.50     $ 11.50  
Expected volatility     268.3 %     179.0 %
Risk-free rate     3.90 %     3.50 %
Expected dividend yield     0.00 %     0.00 %

FPAs are measured at fair value on a recurring basis using a Monte Carlo simulation analysis based upon the following inputs:

 

    As of  
    March 29,     December 28,  
    2026     2025  
VWAP stock price   $ 1.24     $ 1.66  
Simulation period     0.30 years       0.55 years  
Risk-free rate     3.73 %     3.57 %
Volatility     58.0 %     77.3 %

FPAs are measured at fair value on a recurring basis using a Monte Carlo simulation analysis based upon the following inputs:

 

    As of  
    December 28,     December 29,  
    2025     2024  
VWAP stock price   $ 1.66     $ 1.78  
Simulation period     0.55 years       0.55 years  
Risk-free rate     3.57 %     4.28 %
Volatility     77.3 %     117.0 %

The Company valued the private placement and working capital warrants, based on a binomial lattice model, which included the following inputs:

 

    As of  
    December 28,     December 29,  
    2025     2024  
Expected term     2.56 years       3.56 years  
Stock price   $ 1.62     $ 1.81  
Exercise price   $ 11.50     $ 11.50  
Expected volatility     179.0 %     68.1 %
Risk-free rate     3.50 %     4.39 %
Expected dividend yield     0.00 %     0.00 %
Schedule of Financial Liabilities that are not Measured at Fair Value The following tables set forth the Company’s financial liabilities that are not measured at fair value and are considered a Level 3 instrument in the fair value hierarchy (in thousands):
    As of March 29, 2026  
    Principal
amount (1)
    Unamortized
debt
discount
and debt
issuance
costs
    Net
carrying
amount
excluding
capitalized
interest (1)
    Fair value  
12.0% senior unsecured convertible notes                        
July 2024 Notes   $ 27,973     $ (5,655 )   $ 22,318     $ 26,724  
July 2024 Notes – related parties     18,000       (10,054 )     7,946       17,086  
Subtotal July 2024 Notes     45,973       (15,709 )     30,264       43,810  
July 2025 Note – related party     5,000       (3,481 )     1,519       4,494  
November 2025 Note – related party     2,000       (1,483 )     517       1,971  
January 2026 Note – related party     3,300       (2,262 )     1,038       2,955  
                                 
7.0% senior unsecured convertible notes                                
September 2024 Notes     53,793       (37,851 )     15,942       45,830  
September 2024 Notes – related parties     8,750       (5,946 )     2,804       7,461  
Subtotal September 2024 Notes     62,543       (43,797 )     18,746       53,291  
September 2025 Notes     22,000       (18,425 )     3,575       18,793  
Total   $ 140,816     $ (85,157 )   $ 55,659     $ 125,314  
    As of December 28, 2025  
    Principal
amount (1)
    Unamortized
debt
discount
and debt
issuance
costs
    Net
carrying
amount
excluding
capitalized
interest (1)
    Fair value  
12.0% senior unsecured convertible notes                        
July 2024 Notes   $ 27,973     $ (5,832 )   $ 22,141     $ 33,165  
July 2024 Notes – related parties     18,000       (10,369 )     7,631       21,204  
Subtotal July 2024 Notes     45,973       (16,201 )     29,772       54,369  
July 2025 Note – related party     5,000       (3,557 )     1,443       5,641  
November 2025 Note – related party     2,000       (1,509 )     491       2,360  
                                 
7.0% senior unsecured convertible notes                                
September 2024 Notes     56,543       (42,211 )     14,332       59,425  
September 2024 Notes – related parties     8,750       (6,404 )     2,346       8,880  
Subtotal September 2024 Notes     65,293       (48,615 )     16,678       68,305  
September 2025 Notes     22,000       (18,646 )     3,354       24,227  
Total   $ 140,266     $ (88,528 )   $ 51,738     $ 154,902  

 

(1) Excludes capitalized interest (coupon interest, default interest and failure to file interest) of $9.6 million and $10.8 million as of March 29, 2026, and December 28, 2025, respectively, included in the July 2024 Notes.
The following table sets forth the Company’s financial liabilities that were not measured at fair value and are considered a Level 3 instrument in the fair value hierarchy (in thousands):
    As of December 28, 2025  
    Principal
amount (1)
    Unamortized
debt
discount
and debt
issuance
costs
    Net
carrying
amount
excluding
capitalized
interest (1)
    Fair value  
12.0% senior unsecured convertible notes                        
July 2024 Notes   $ 27,973     $ (5,832 )   $ 22,141     $ 33,165  
July 2024 Notes – related parties     18,000       (10,369 )     7,631       21,204  
Subtotal July 2024 Notes     45,973       (16,201 )     29,772       54,369  
July 2025 Note – related party     5,000       (3,557 )     1,443       5,641  
November 2025 Note – related party     2,000       (1,509 )     491       2,360  
                                 
7.0% senior unsecured convertible notes                                
September 2024 Notes     56,543       (42,211 )     14,332       59,425  
September 2024 Notes – related parties     8,750       (6,404 )     2,346       8,880  
Subtotal September 2024 Notes     65,293       (48,615 )     16,678       68,305  
September 2025 Notes     22,000       (18,646 )     3,354       24,227  
Total   $ 140,266     $ (88,528 )   $ 51,738     $ 154,902  
    As of December 29, 2024  
    Principal
amount (1)
    Unamortized
debt
discount
and debt
issuance
costs
    Net
carrying
amount
excluding
capitalized
interest (1)
    Fair value  
12.0% senior unsecured convertible notes                        
July 2024 Notes   $ 17,973     $ (6,205 )   $ 11,768     $ 21,390  
July 2024 Notes – related parties     28,000       (10,785 )     17,215       33,323  
Subtotal July 2024 Notes     45,973       (16,990 )     28,983       54,713  
                                 
7.0% senior unsecured convertible notes                                
September 2024 Notes     71,800       (66,164 )     5,636       77,245  
September 2024 Notes – related parties     8,000       (7,524 )     476       8,583  
Subtotal September 2024 Notes     79,800       (73,688 )     6,112       85,828  
Total   $ 125,773     $ (90,678 )   $ 35,095     $ 140,541  

 

(1) Excludes capitalized interest (coupon interest, default interest and failure to file interest) of $10.8 million and $13.6 million as of December 28, 2025 and December 29, 2024, respectively, included in the July 2024 Notes.