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        Signature
      
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        /s/ Eric J. Christ as Attorney-in-Fact
      
      
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        Stock symbol
      
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        XOG
      
      
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        Transactions as of
      
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        Oct 27, 2021
      
      
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        Transactions value $
      
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        -$3,005,413
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        10/29/2021, 09:23 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | XOG | COMMON STOCK | Award | $0 | +84.6K | +600% | $0.00 | 98.7K | Oct 27, 2021 | Direct | F1, F2 | 
          
            | transaction | XOG | COMMON STOCK | Tax liability | -$3.01M | -43.4K | -43.98% | $69.23 | 55.3K | Oct 27, 2021 | Direct |  | 
      
    
   
  
    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 | XOG | Performance Stock Unit | Disposed to Issuer | $0 | -42.3K | -100% | $0.00* | 0 | Oct 27, 2021 | COMMON STOCK | 84.6K |  | Direct | F1 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  Eric J. Christ is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.
  
    Explanation of Responses: