- 
        Signature
      
 
      - 
        /s/ Eric J. Christ as Attorney-in-Fact
      
 
    
    
      
- 
        Stock symbol
      
 
      - 
        XOG
      
 
    
    
      
- 
        Transactions as of
      
 
      - 
        Oct 27, 2021
      
 
    
    
      
- 
        Transactions value $
      
 
      - 
        -$3,836,450
      
 
    
    
      
- 
        Form type
      
 
      - 
        4
      
 
    
    
      
- 
        Date filed
      
 
      - 
        10/29/2021, 09:25 PM
      
 
    
    
    
    
   
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | 
          Sym | 
          Class | 
          Transaction | 
          Value $ | 
          Shares | 
          Change % | 
          * Price $ | 
          Shares After | 
          Date | 
          Ownership | 
          Footnotes | 
        
      
      
          
            | transaction | 
            XOG | 
            COMMON STOCK | 
            Award | 
             | 
            +108K | 
            +600% | 
             | 
            126K | 
            Oct 27, 2021 | 
            Direct | 
            F1, F2 | 
          
          
            | transaction | 
            XOG | 
            COMMON STOCK | 
            Tax liability | 
            -$3.84M | 
            -55.4K | 
            -44.01% | 
            $69.23 | 
            70.5K | 
            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 | 
            -54K | 
            -100% | 
            $0.00* | 
            0 | 
            Oct 27, 2021 | 
            COMMON STOCK | 
            108K | 
             | 
            Direct | 
            F1 | 
          
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  Thomas B. Tyree JR is no longer subject to Section 16 filing requirements. Form 4 or Form 5 obligations may continue.
  
    Explanation of Responses: