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        Signature
      
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        /s/ Bruce Posey
      
      
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        Stock symbol
      
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        QLYS
      
      
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        Transactions as of
      
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        May 20, 2024
      
      
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        Transactions value $
      
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        -$193,171
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        5/21/2024, 05:58 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | QLYS | Common Stock | Options Exercise | $25.6K | +1K | +1.67% | $25.56 | 60.9K | May 20, 2024 | Direct | F1 | 
          
            | transaction | QLYS | Common Stock | Sale | -$85.7K | -594 | -0.97% | $144.31 | 60.4K | May 20, 2024 | Direct | F1, F2 | 
          
            | transaction | QLYS | Common Stock | Sale | -$90.6K | -621 | -1.03% | $145.84 | 59.7K | May 20, 2024 | Direct | F1, F3 | 
          
            | transaction | QLYS | Common Stock | Sale | -$16.9K | -115 | -0.19% | $146.84 | 59.6K | May 20, 2024 | Direct | F1, F4 | 
      
    
   
  
    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 | QLYS | Stock Option (right to buy) | Options Exercise | -$25.6K | -1K | -16.67% | $25.56 | 5K | May 20, 2024 | Common Stock | 1K | $25.56 | Direct | F1, F5 | 
      
    
   
  
    * 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: