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        Signature
      
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        /s/ Ewelina Kemp, Attorney-in-Fact for Alan Trefler
      
      
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        Stock symbol
      
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        PEGA
      
      
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        Transactions as of
      
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        May 27, 2025
      
      
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        Transactions value $
      
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        -$3,039,628
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        5/28/2025, 05:10 PM
      
 
     
   
 
  
    Reporting Owners (1)
  
  
    
      
        
          | Name | Relationship | Address | Signature | Signature date | CIK | 
      
      
          
            | TREFLER ALAN | C.E.O. & Chairman, Director, 10%+ Owner | C/O PEGASYSTEMS INC., 225 WYMAN STREET, STE 300, WALTHAM | /s/ Ewelina Kemp, Attorney-in-Fact for Alan Trefler | 2025-05-28 | 0001032235 | 
      
    
   
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | PEGA | Common stock | Sale | -$1.68M | -17.5K | -0.1% | $96.02 | 17.1M | May 27, 2025 | Direct | F1, F2 | 
          
            | transaction | PEGA | Common stock | Sale | -$1.35M | -13.9K | -0.08% | $97.08 | 17.1M | May 27, 2025 | Direct | F1, F3 | 
          
            | transaction | PEGA | Common stock | Sale | -$17.5K | -179 | 0% | $97.68 | 17.1M | May 27, 2025 | Direct | F1, F4, F5 | 
          
            | holding | PEGA | Common stock |  |  |  |  |  | 1.61M | May 27, 2025 | Alan N. Trefler Irrevocable Non-GST Trust of 2022 |  | 
          
            | holding | PEGA | Common stock |  |  |  |  |  | 5.07M | May 27, 2025 | Alan N. Trefler Grantor Retained Annuity Trust I of 2023 |  | 
          
            | holding | PEGA | Common stock |  |  |  |  |  | 7.5M | May 27, 2025 | Alan N. Trefler Grantor Retained Annuity Trust I of 2024 |  | 
          
            | holding | PEGA | Common stock |  |  |  |  |  | 6M | May 27, 2025 | Alan N. Trefler Grantor Retained Annuity Trust II of 2024 |  | 
          
            | holding | PEGA | Common stock |  |  |  |  |  | 2.19M | May 27, 2025 | Alan N. Trefler Grantor Retained Annuity Trust II of 2023 |  | 
      
    
   
  
    * 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: