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        Signature
      
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        /s/ Beth Hecht as Attorney-in-Fact
      
      
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        Stock symbol
      
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        XERS
      
      
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        Transactions as of
      
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        Nov 15, 2021
      
      
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        Transactions value $
      
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        $45,664
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
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        11/16/2021, 03:25 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | XERS | Common Stock | Purchase | $45.7K | +20K | +148.92% | $2.28 | 33.4K | Nov 15, 2021 | By: Paul R. Edick 2008 Revocable Trust u/d/t dated 6/25/2018 | F1, F2 | 
          
            | holding | XERS | Common Stock |  |  |  |  |  | 808K | Nov 15, 2021 | Direct |  | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Explanation of Responses:
  
  
  
    Remarks:
  
  Chairman & Chief Executive Officer