| 
                 
                    Closing price on 9/6/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    2.05 | 
                 
                
                    | High | 
                    2.26 | 
                 
                
                    | Low | 
                    2.02 | 
                     
                
                    | Volume | 
                    448,510 | 
                                 
                
                    | Split-adjusted Price | 
                    2.05 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VOS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                9/6/2019
             | 
            
                +0.08 / +3.77%
             |             
            
                2.05
             |           
            
                2.26
             |               
            
                2.02
             |                           
            
                2.20
             | 
            
                2.12
             |                     
            
                2.05
             |                                 
            
                448,510
             |            
            
                 
             |                                       
         
    
        
            | 
                9/5/2019
             | 
            
                -0.08 / -3.64%
             |             
            
                2.12
             |           
            
                2.15
             |               
            
                2.05
             |                           
            
                2.12
             | 
            
                2.09
             |                     
            
                1.97
             |                                 
            
                329,320
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/4/2019
             | 
            
                -0.16 / -6.78%
             |             
            
                2.35
             |           
            
                2.42
             |               
            
                2.20
             |                           
            
                2.20
             | 
            
                2.22
             |                     
            
                2.05
             |                                 
            
                1,216,640
             |            
            
                 
             |                                       
         
    
        
            | 
                9/3/2019
             | 
            
                +0.14 / +6.31%
             |             
            
                2.22
             |           
            
                2.36
             |               
            
                2.22
             |                           
            
                2.36
             | 
            
                2.30
             |                     
            
                2.20
             |                                 
            
                1,086,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/30/2019
             | 
            
                +0.07 / +3.26%
             |             
            
                2.20
             |           
            
                2.30
             |               
            
                2.15
             |                           
            
                2.22
             | 
            
                2.24
             |                     
            
                2.07
             |                                 
            
                814,230
             |            
            
                 
             |                                       
         
    
        
            | 
                8/29/2019
             | 
            
                +0.14 / +6.97%
             |             
            
                2.15
             |           
            
                2.15
             |               
            
                2.05
             |                           
            
                2.15
             | 
            
                2.13
             |                     
            
                2.00
             |                                 
            
                1,157,040
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/28/2019
             | 
            
                +0.13 / +6.91%
             |             
            
                1.98
             |           
            
                2.01
             |               
            
                1.98
             |                           
            
                2.01
             | 
            
                2.01
             |                     
            
                1.87
             |                                 
            
                791,160
             |            
            
                 
             |                                       
         
    
        
            | 
                8/27/2019
             | 
            
                +0.12 / +6.82%
             |             
            
                1.75
             |           
            
                1.88
             |               
            
                1.75
             |                           
            
                1.88
             | 
            
                1.87
             |                     
            
                1.75
             |                                 
            
                712,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/26/2019
             | 
            
                -0.02 / -1.12%
             |             
            
                1.75
             |           
            
                1.77
             |               
            
                1.73
             |                           
            
                1.76
             | 
            
                1.76
             |                     
            
                1.64
             |                                 
            
                108,660
             |            
            
                 
             |                                       
         
    
        
            | 
                8/23/2019
             | 
            
                +0.01 / +0.56%
             |             
            
                1.77
             |           
            
                1.79
             |               
            
                1.71
             |                           
            
                1.78
             | 
            
                1.78
             |                     
            
                1.66
             |                                 
            
                129,410
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/22/2019
             | 
            
                +0.08 / +4.73%
             |             
            
                1.70
             |           
            
                1.77
             |               
            
                1.69
             |                           
            
                1.77
             | 
            
                1.72
             |                     
            
                1.65
             |                                 
            
                33,810
             |            
            
                 
             |                                       
         
    
        
            | 
                8/21/2019
             | 
            
                -0.07 / -3.98%
             |             
            
                1.68
             |           
            
                1.76
             |               
            
                1.68
             |                           
            
                1.69
             | 
            
                1.72
             |                     
            
                1.57
             |                                 
            
                163,470
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/20/2019
             | 
            
                -0.06 / -3.30%
             |             
            
                1.75
             |           
            
                1.81
             |               
            
                1.75
             |                           
            
                1.76
             | 
            
                1.77
             |                     
            
                1.64
             |                                 
            
                130,500
             |            
            
                 
             |                                       
         
    
        
            | 
                8/19/2019
             | 
            
                +0.02 / +1.11%
             |             
            
                1.88
             |           
            
                1.88
             |               
            
                1.76
             |                           
            
                1.82
             | 
            
                1.80
             |                     
            
                1.69
             |                                 
            
                83,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/16/2019
             | 
            
                -0.01 / -0.55%
             |             
            
                1.80
             |           
            
                1.88
             |               
            
                1.70
             |                           
            
                1.80
             | 
            
                1.79
             |                     
            
                1.68
             |                                 
            
                176,290
             |            
            
                 
             |                                       
         
    
        
            | 
                8/15/2019
             | 
            
                +0.11 / +6.47%
             |             
            
                1.70
             |           
            
                1.81
             |               
            
                1.66
             |                           
            
                1.81
             | 
            
                1.77
             |                     
            
                1.68
             |                                 
            
                542,860
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/14/2019
             | 
            
                -0.06 / -3.41%
             |             
            
                1.65
             |           
            
                1.74
             |               
            
                1.65
             |                           
            
                1.70
             | 
            
                1.69
             |                     
            
                1.58
             |                                 
            
                133,510
             |            
            
                 
             |                                       
         
    
        
            | 
                8/13/2019
             | 
            
                -0.13 / -6.88%
             |             
            
                1.89
             |           
            
                1.89
             |               
            
                1.76
             |                           
            
                1.76
             | 
            
                1.78
             |                     
            
                1.64
             |                                 
            
                216,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/12/2019
             | 
            
                +0.12 / +6.78%
             |             
            
                1.80
             |           
            
                1.89
             |               
            
                1.80
             |                           
            
                1.89
             | 
            
                1.88
             |                     
            
                1.76
             |                                 
            
                771,900
             |            
            
                 
             |                                       
         
    
        
            | 
                8/9/2019
             | 
            
                +0.11 / +6.63%
             |             
            
                1.68
             |           
            
                1.77
             |               
            
                1.66
             |                           
            
                1.77
             | 
            
                1.77
             |                     
            
                1.65
             |                                 
            
                436,710
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/8/2019
             | 
            
                +0.10 / +6.41%
             |             
            
                1.57
             |           
            
                1.66
             |               
            
                1.57
             |                           
            
                1.66
             | 
            
                1.64
             |                     
            
                1.55
             |                                 
            
                614,430
             |            
            
                 
             |                                       
         
    
        
            | 
                8/7/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.56
             |           
            
                1.56
             |               
            
                1.54
             |                           
            
                1.56
             | 
            
                1.56
             |                     
            
                1.45
             |                                 
            
                340,780
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/6/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.52
             |           
            
                1.56
             |               
            
                1.52
             |                           
            
                1.56
             | 
            
                1.55
             |                     
            
                1.45
             |                                 
            
                262,440
             |            
            
                 
             |                                       
         
    
        
            | 
                8/5/2019
             | 
            
                +0.04 / +2.63%
             |             
            
                1.51
             |           
            
                1.57
             |               
            
                1.51
             |                           
            
                1.56
             | 
            
                1.55
             |                     
            
                1.45
             |                                 
            
                285,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                8/2/2019
             | 
            
                +0.02 / +1.33%
             |             
            
                1.47
             |           
            
                1.53
             |               
            
                1.47
             |                           
            
                1.52
             | 
            
                1.51
             |                     
            
                1.41
             |                                 
            
                197,910
             |            
            
                 
             |                                       
         
    
        
            | 
                8/1/2019
             | 
            
                +0.03 / +2.04%
             |             
            
                1.49
             |           
            
                1.50
             |               
            
                1.47
             |                           
            
                1.50
             | 
            
                1.50
             |                     
            
                1.40
             |                                 
            
                61,520
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/31/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.44
             |           
            
                1.49
             |               
            
                1.41
             |                           
            
                1.47
             | 
            
                1.46
             |                     
            
                1.37
             |                                 
            
                116,210
             |            
            
                 
             |                                       
         
    
        
            | 
                7/30/2019
             | 
            
                +0.02 / +1.38%
             |             
            
                1.45
             |           
            
                1.50
             |               
            
                1.43
             |                           
            
                1.47
             | 
            
                1.47
             |                     
            
                1.37
             |                                 
            
                90,870
             |  
            
                 
             |                                                              
             
    
        			
            | 
                7/29/2019
             | 
            
                -0.02 / -1.36%
             |             
            
                1.48
             |           
            
                1.48
             |               
            
                1.41
             |                           
            
                1.45
             | 
            
                1.45
             |                     
            
                1.35
             |                                 
            
                67,460
             |            
            
                 
             |                                       
         
    
        
            | 
                7/26/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.43
             |           
            
                1.48
             |               
            
                1.43
             |                           
            
                1.47
             | 
            
                1.45
             |                     
            
                1.37
             |                                 
            
                35,950
             |  
            
                 
             |                                                              
             
    
         
    
    
 |