- 
        Signature
      
- 
        /s/ Julia Wright, as attorney-in-fact
      
      
- 
        Stock symbol
      
- 
        CHX
      
      
- 
        Transactions as of
      
- 
        Feb 21, 2023
      
      
- 
        Transactions value $
      
- 
        -$156,524
      
      
- 
        Form type
      
- 
        4
      
      
- 
        Date filed
      
- 
        2/23/2023, 04:12 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | CHX | Common Stock | Tax liability | -$157K | -5.21K | -1.05% | $30.02 | 493K | Feb 21, 2023 | Direct |  | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Remarks:
  
  Chief Operating Officer and President, Chemical Technologies