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        Signature
      
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        /s/ Po Yi Patsy Chan
      
      
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        Stock symbol
      
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        BSII
      
      
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        Transactions as of
      
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        Jun 3, 2025
      
      
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        Transactions value $
      
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        $0
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        6/4/2025, 06:15 PM
      
 
     
   
 
  
    Reporting Owners (1)
  
  
    
      
        
          | Name | Relationship | Address | Signature | Signature date | CIK | 
      
      
          
            | Chan Po Yi Patsy | Director | SUITE 2902, 29/F, THE CENTRIUM, 60 WYNDHAM STREET, CENTRAL, HONG KONG, HONG KONG | /s/ Po Yi Patsy Chan | 2025-06-04 | 0001855122 | 
      
    
   
  
    Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes | 
      
      
          
            | transaction | BSII | Class B ordinary shares | Disposed to Issuer |  | -17.7K | -100% |  | 0 | Jun 3, 2025 | Class A ordinary shares | 17.7K |  | Direct | F1 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  Po Yi Patsy Chan is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.
  
    Explanation of Responses: