| 
                 
                    Closing price on 6/5/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    1.61 | 
                 
                
                    | High | 
                    1.63 | 
                 
                
                    | Low | 
                    1.55 | 
                     
                
                    | Volume | 
                    19,870 | 
                                 
                
                    | Split-adjusted Price | 
                    1.49 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VOS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                6/5/2019
             | 
            
                -0.01 / -0.62%
             |             
            
                1.61
             |           
            
                1.63
             |               
            
                1.55
             |                           
            
                1.60
             | 
            
                1.56
             |                     
            
                1.49
             |                                 
            
                19,870
             |            
            
                 
             |                                       
         
    
        
            | 
                6/4/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.53
             |           
            
                1.61
             |               
            
                1.53
             |                           
            
                1.61
             | 
            
                1.60
             |                     
            
                1.50
             |                                 
            
                20,590
             |  
            
                 
             |                                                              
             
    
        			
            | 
                6/3/2019
             | 
            
                -0.02 / -1.23%
             |             
            
                1.60
             |           
            
                1.63
             |               
            
                1.59
             |                           
            
                1.61
             | 
            
                1.61
             |                     
            
                1.50
             |                                 
            
                6,360
             |            
            
                 
             |                                       
         
    
        
            | 
                5/31/2019
             | 
            
                +0.01 / +0.62%
             |             
            
                1.65
             |           
            
                1.65
             |               
            
                1.58
             |                           
            
                1.63
             | 
            
                1.63
             |                     
            
                1.52
             |                                 
            
                8,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/30/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.63
             |           
            
                1.63
             |               
            
                1.60
             |                           
            
                1.62
             | 
            
                1.61
             |                     
            
                1.51
             |                                 
            
                100,160
             |            
            
                 
             |                                       
         
    
        
            | 
                5/29/2019
             | 
            
                -0.02 / -1.22%
             |             
            
                1.64
             |           
            
                1.65
             |               
            
                1.62
             |                           
            
                1.62
             | 
            
                1.64
             |                     
            
                1.51
             |                                 
            
                108,350
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/28/2019
             | 
            
                +0.02 / +1.23%
             |             
            
                1.62
             |           
            
                1.65
             |               
            
                1.62
             |                           
            
                1.64
             | 
            
                1.63
             |                     
            
                1.53
             |                                 
            
                84,550
             |            
            
                 
             |                                       
         
    
        
            | 
                5/27/2019
             | 
            
                +0.05 / +3.18%
             |             
            
                1.57
             |           
            
                1.64
             |               
            
                1.57
             |                           
            
                1.62
             | 
            
                1.62
             |                     
            
                1.51
             |                                 
            
                175,760
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/24/2019
             | 
            
                +0.05 / +3.29%
             |             
            
                1.56
             |           
            
                1.59
             |               
            
                1.55
             |                           
            
                1.57
             | 
            
                1.56
             |                     
            
                1.46
             |                                 
            
                244,280
             |            
            
                 
             |                                       
         
    
        
            | 
                5/23/2019
             | 
            
                -0.03 / -1.94%
             |             
            
                1.52
             |           
            
                1.55
             |               
            
                1.51
             |                           
            
                1.52
             | 
            
                1.52
             |                     
            
                1.41
             |                                 
            
                96,350
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/22/2019
             | 
            
                +0.01 / +0.65%
             |             
            
                1.52
             |           
            
                1.55
             |               
            
                1.50
             |                           
            
                1.55
             | 
            
                1.51
             |                     
            
                1.44
             |                                 
            
                25,800
             |            
            
                 
             |                                       
         
    
        
            | 
                5/21/2019
             | 
            
                -0.01 / -0.65%
             |             
            
                1.54
             |           
            
                1.55
             |               
            
                1.51
             |                           
            
                1.54
             | 
            
                1.53
             |                     
            
                1.43
             |                                 
            
                97,860
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/20/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.58
             |           
            
                1.58
             |               
            
                1.51
             |                           
            
                1.55
             | 
            
                1.54
             |                     
            
                1.44
             |                                 
            
                46,230
             |            
            
                 
             |                                       
         
    
        
            | 
                5/17/2019
             | 
            
                -0.05 / -3.13%
             |             
            
                1.58
             |           
            
                1.60
             |               
            
                1.55
             |                           
            
                1.55
             | 
            
                1.57
             |                     
            
                1.44
             |                                 
            
                129,480
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/16/2019
             | 
            
                -0.02 / -1.23%
             |             
            
                1.60
             |           
            
                1.62
             |               
            
                1.59
             |                           
            
                1.60
             | 
            
                1.60
             |                     
            
                1.49
             |                                 
            
                16,040
             |            
            
                 
             |                                       
         
    
        
            | 
                5/15/2019
             | 
            
                +0.02 / +1.25%
             |             
            
                1.60
             |           
            
                1.69
             |               
            
                1.60
             |                           
            
                1.62
             | 
            
                1.64
             |                     
            
                1.51
             |                                 
            
                127,730
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/14/2019
             | 
            
                +0.10 / +6.67%
             |             
            
                1.51
             |           
            
                1.60
             |               
            
                1.51
             |                           
            
                1.60
             | 
            
                1.59
             |                     
            
                1.49
             |                                 
            
                456,920
             |            
            
                 
             |                                       
         
    
        
            | 
                5/13/2019
             | 
            
                -0.04 / -2.60%
             |             
            
                1.54
             |           
            
                1.54
             |               
            
                1.50
             |                           
            
                1.50
             | 
            
                1.52
             |                     
            
                1.40
             |                                 
            
                30,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/10/2019
             | 
            
                +0.03 / +1.99%
             |             
            
                1.52
             |           
            
                1.54
             |               
            
                1.51
             |                           
            
                1.54
             | 
            
                1.51
             |                     
            
                1.43
             |                                 
            
                15,850
             |            
            
                 
             |                                       
         
    
        
            | 
                5/9/2019
             | 
            
                -0.01 / -0.66%
             |             
            
                1.52
             |           
            
                1.53
             |               
            
                1.51
             |                           
            
                1.51
             | 
            
                1.52
             |                     
            
                1.41
             |                                 
            
                31,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/8/2019
             | 
            
                +0.02 / +1.33%
             |             
            
                1.50
             |           
            
                1.53
             |               
            
                1.49
             |                           
            
                1.52
             | 
            
                1.51
             |                     
            
                1.41
             |                                 
            
                13,470
             |            
            
                 
             |                                       
         
    
        
            | 
                5/7/2019
             | 
            
                -0.01 / -0.66%
             |             
            
                1.50
             |           
            
                1.53
             |               
            
                1.49
             |                           
            
                1.50
             | 
            
                1.51
             |                     
            
                1.40
             |                                 
            
                103,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/6/2019
             | 
            
                -0.03 / -1.95%
             |             
            
                1.54
             |           
            
                1.56
             |               
            
                1.50
             |                           
            
                1.51
             | 
            
                1.52
             |                     
            
                1.41
             |                                 
            
                117,140
             |            
            
                 
             |                                       
         
    
        
            | 
                5/3/2019
             | 
            
                -0.03 / -1.91%
             |             
            
                1.55
             |           
            
                1.58
             |               
            
                1.54
             |                           
            
                1.54
             | 
            
                1.55
             |                     
            
                1.43
             |                                 
            
                61,190
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/2/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.57
             |           
            
                1.57
             |               
            
                1.53
             |                           
            
                1.57
             | 
            
                1.56
             |                     
            
                1.46
             |                                 
            
                5,550
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2019
             | 
            
                -0.02 / -1.26%
             |             
            
                1.58
             |           
            
                1.60
             |               
            
                1.53
             |                           
            
                1.57
             | 
            
                1.54
             |                     
            
                1.46
             |                                 
            
                144,410
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2019
             | 
            
                -0.01 / -0.63%
             |             
            
                1.60
             |           
            
                1.60
             |               
            
                1.57
             |                           
            
                1.59
             | 
            
                1.59
             |                     
            
                1.48
             |                                 
            
                14,060
             |            
            
                 
             |                                       
         
    
        
            | 
                4/24/2019
             | 
            
                +0.02 / +1.27%
             |             
            
                1.59
             |           
            
                1.61
             |               
            
                1.58
             |                           
            
                1.60
             | 
            
                1.60
             |                     
            
                1.49
             |                                 
            
                91,960
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/23/2019
             | 
            
                -0.02 / -1.25%
             |             
            
                1.60
             |           
            
                1.60
             |               
            
                1.57
             |                           
            
                1.58
             | 
            
                1.59
             |                     
            
                1.47
             |                                 
            
                57,960
             |            
            
                 
             |                                       
         
    
        
            | 
                4/22/2019
             | 
            
                -0.02 / -1.23%
             |             
            
                1.64
             |           
            
                1.64
             |               
            
                1.56
             |                           
            
                1.60
             | 
            
                1.62
             |                     
            
                1.49
             |                                 
            
                103,850
             |  
            
                 
             |                                                              
             
    
         
    
    
 |