- 
        Signature
      
 
      - 
        /s/ Ewelina Kemp, Attorney-in-Fact for Alan Trefler
      
 
    
    
      
- 
        Stock symbol
      
 
      - 
        PEGA
      
 
    
    
      
- 
        Transactions as of
      
 
      - 
        Aug 5, 2025
      
 
    
    
      
- 
        Transactions value $
      
 
      - 
        -$5,167,763
      
 
    
    
      
- 
        Form type
      
 
      - 
        4
      
 
    
    
      
- 
        Date filed
      
 
      - 
        8/7/2025, 05:09 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 | 
            2025-08-07 | 
            0001032235 | 
          
      
    
   
  
    Transactions Table
  
  
    
      
        
          | Type | 
          Sym | 
          Class | 
          Transaction | 
          Value $ | 
          Shares | 
          Change % | 
          * Price $ | 
          Shares After | 
          Date | 
          Ownership | 
          Footnotes | 
        
      
      
          
            | transaction | 
            PEGA | 
            Common stock | 
            Sale | 
            -$2.15M | 
            -37.5K | 
            -0.11% | 
            $57.32 | 
            33M | 
            Aug 5, 2025 | 
            Direct | 
            F1, F2 | 
          
          
            | transaction | 
            PEGA | 
            Common stock | 
            Sale | 
            -$435K | 
            -7.46K | 
            -0.02% | 
            $58.34 | 
            33M | 
            Aug 5, 2025 | 
            Direct | 
            F1, F3 | 
          
          
            | transaction | 
            PEGA | 
            Common stock | 
            Sale | 
            -$2.58M | 
            -45K | 
            -0.14% | 
            $57.35 | 
            32.9M | 
            Aug 6, 2025 | 
            Direct | 
            F1, F4 | 
          
          
            | holding | 
            PEGA | 
            Common stock | 
             | 
             | 
             | 
             | 
             | 
            3.21M | 
            Aug 5, 2025 | 
            Alan N. Trefler Irrevocable Non-GST Trust of 2022 | 
             | 
          
          
            | holding | 
            PEGA | 
            Common stock | 
             | 
             | 
             | 
             | 
             | 
            10.1M | 
            Aug 5, 2025 | 
            Alan N. Trefler Grantor Retained Annuity Trust I of 2023 | 
             | 
          
          
            | holding | 
            PEGA | 
            Common stock | 
             | 
             | 
             | 
             | 
             | 
            4.38M | 
            Aug 5, 2025 | 
            Alan N. Trefler Grantor Retained Annuity Trust II of 2023 | 
             | 
          
          
            | holding | 
            PEGA | 
            Common stock | 
             | 
             | 
             | 
             | 
             | 
            15M | 
            Aug 5, 2025 | 
            Alan N. Trefler Grantor Retained Annuity Trust I of 2024 | 
             | 
          
          
            | holding | 
            PEGA | 
            Common stock | 
             | 
             | 
             | 
             | 
             | 
            12M | 
            Aug 5, 2025 | 
            Alan N. Trefler Grantor Retained Annuity Trust II of 2024 | 
             | 
          
      
    
   
  
    * 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: