- 
        Signature
      
 
      - 
        /s/ David Krempa
      
 
    
    
      
- 
        Stock symbol
      
 
      - 
        ETON
      
 
    
    
      
- 
        Transactions as of
      
 
      - 
        Mar 1, 2023
      
 
    
    
      
- 
        Transactions value $
      
 
      - 
        $0
      
 
    
    
      
- 
        Form type
      
 
      - 
        3
      
 
    
    
      
- 
        Date filed
      
 
      - 
        3/8/2023, 01:39 PM
      
 
    
    
    
   
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | 
          Sym | 
          Class | 
          Transaction | 
          Value $ | 
          Shares | 
          Change % | 
          * Price $ | 
          Shares After | 
          Date | 
          Ownership | 
          Footnotes | 
        
      
      
          
            | holding | 
            ETON | 
            Common Stock | 
             | 
             | 
             | 
             | 
             | 
            12.8K | 
            Mar 1, 2023 | 
            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 | 
        
      
      
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            25K | 
            $1.38 | 
            Direct | 
            F1 | 
          
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            25K | 
            $1.37 | 
            Direct | 
            F2 | 
          
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            95K | 
            $7.31 | 
            Direct | 
            F3 | 
          
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            156K | 
            $3.58 | 
            Direct | 
            F4 | 
          
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            85K | 
            $8.61 | 
            Direct | 
            F5 | 
          
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            20K | 
            $5.76 | 
            Direct | 
            F6 | 
          
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            158K | 
            $3.78 | 
            Direct | 
            F7 | 
          
          
            | holding | 
            ETON | 
            Employee Stock Option (Right to buy) | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            74.3K | 
            $3.47 | 
            Direct | 
            F8 | 
          
          
            | holding | 
            ETON | 
            Restricted Stock Units | 
             | 
             | 
             | 
             | 
             | 
             | 
            Mar 1, 2023 | 
            Common Stock | 
            40K | 
            $0.00 | 
            Direct | 
            F9 | 
          
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Explanation of Responses:
  
  
  
    Remarks:
  
  Exhibit List - Exhibit 24: Power of Attorney