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        Signature
      
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        /s/ Margaret Chow, by Power of Attorney for Lynn M. Christensen
      
      
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        Stock symbol
      
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        BASE
      
      
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        Transactions as of
      
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        Jun 16, 2025
      
      
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        Transactions value $
      
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        -$158,758
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        6/18/2025, 06:29 PM
      
 
     
   
 
  
    Reporting Owners (1)
  
  
    
      
        
          | Name | Relationship | Address | Signature | Signature date | CIK | 
      
      
          
            | Christensen Lynn M | Director | C/O COUCHBASE, INC., 3155 OLSEN DR., SUITE 150, SAN JOSE | /s/ Margaret Chow, by Power of Attorney for Lynn M. Christensen | 2025-06-18 | 0001869744 | 
      
    
   
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | BASE | Common Stock | Award | $0 | +520 | +2.68% | $0.00 | 19.9K | Jun 16, 2025 | Direct | F1 | 
          
            | transaction | BASE | Common Stock | Sale | -$159K | -7.93K | -39.82% | $20.01 | 12K | Jun 17, 2025 | Direct | F2, F3 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.
  Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).
  
    Explanation of Responses: