- 
        Signature
      
- 
        /s/ Alex Dillard
      
      
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        Stock symbol
      
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        DDS
      
      
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        Transactions as of
      
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        Jan 28, 2022
      
      
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        Transactions value $
      
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        $59,126
      
      
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        Form type
      
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        4
      
      
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        Date filed
      
- 
        2/1/2022, 05:24 PM
      
 
     
   
 
  
    Transactions Table
  
  
    
      
        
          | Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes | 
      
      
          
            | transaction | DDS | Common Class A | Award | $40.9K | +163 | +0.02% | $250.71 | 1.01M | Jan 28, 2022 | Direct |  | 
          
            | transaction | DDS | Common Class A | Award | $18.3K | +71 | +0.01% | $257.19 | 1.01M | Feb 1, 2022 | Direct |  | 
          
            | holding | DDS | Common Class A - Retirement Plan |  |  |  |  |  | 42 | Jan 28, 2022 | Direct |  | 
          
            | holding | DDS | Common Class A |  |  |  |  |  | 41.5K | Jan 28, 2022 | See Footnote | F1 | 
          
            | holding | DDS | Common Class A |  |  |  |  |  | 7.3K | Jan 28, 2022 | See Footnote | F2 | 
          
            | holding | DDS | Common Class A |  |  |  |  |  | 36.5K | Jan 28, 2022 | See Footnote | F3 | 
      
    
   
  
    * An asterisk sign (*) next to the price indicates that the price is likely invalid.
  
  
    Explanation of Responses:
  
  
  
    Remarks:
  
  Remarks: The reporting person disclaims beneficial ownership of the shares reported herein as indirectly beneficially owned, except to the extent of his pecuniary interest therein.