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        Signature
      
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        /s/ Bruce Posey by power of attorney for Sumedh S. Thakar
      
      
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        Stock symbol
      
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        QLYS
      
      
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        Transactions as of
      
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        Feb 14, 2024
      
      
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        Transactions value $
      
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        -$687,225
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        2/16/2024, 04:19 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | QLYS | Common Stock | Options Exercise | $99.4K | +3.25K | +1.66% | $30.58 | 199K | Feb 14, 2024 | Direct | F1 | 
          
            | transaction | QLYS | Common Stock | Sale | -$209K | -1.24K | -0.62% | $169.47 | 198K | Feb 14, 2024 | Direct | F1, F2 | 
          
            | transaction | QLYS | Common Stock | Sale | -$443K | -2.6K | -1.31% | $170.27 | 196K | Feb 14, 2024 | Direct | F1, F3 | 
          
            | transaction | QLYS | Common Stock | Sale | -$49K | -286 | -0.15% | $171.42 | 195K | Feb 14, 2024 | Direct | F1, F4 | 
          
            | transaction | QLYS | Common Stock | Award | $13.6K | +108 | +0.06% | $126.25 | 195K | Feb 15, 2024 | Direct | F5 | 
      
    
   
  
    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 | -$99.4K | -3.25K | -33.64% | $30.58 | 6.41K | Feb 14, 2024 | Common Stock | 3.25K | $30.58 | Direct | F1, F6 | 
      
    
   
  
    * 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: