| 
                 
                    Closing price on 10/10/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    1.80 | 
                 
                
                    | High | 
                    1.84 | 
                 
                
                    | Low | 
                    1.79 | 
                     
                
                    | Volume | 
                    21,330 | 
                                 
                
                    | Split-adjusted Price | 
                    1.67 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VOS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                10/10/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.80
             |           
            
                1.84
             |               
            
                1.79
             |                           
            
                1.79
             | 
            
                1.81
             |                     
            
                1.67
             |                                 
            
                21,330
             |            
            
                 
             |                                       
         
    
        
            | 
                10/9/2019
             | 
            
                -0.03 / -1.65%
             |             
            
                1.80
             |           
            
                1.80
             |               
            
                1.75
             |                           
            
                1.79
             | 
            
                1.77
             |                     
            
                1.67
             |                                 
            
                32,120
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/8/2019
             | 
            
                +0.03 / +1.68%
             |             
            
                1.80
             |           
            
                1.82
             |               
            
                1.70
             |                           
            
                1.82
             | 
            
                1.74
             |                     
            
                1.69
             |                                 
            
                33,280
             |            
            
                 
             |                                       
         
    
        
            | 
                10/7/2019
             | 
            
                -0.06 / -3.24%
             |             
            
                1.89
             |           
            
                1.89
             |               
            
                1.79
             |                           
            
                1.79
             | 
            
                1.80
             |                     
            
                1.67
             |                                 
            
                99,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/4/2019
             | 
            
                0.00 / 0.00%
             |             
            
                1.85
             |           
            
                1.86
             |               
            
                1.84
             |                           
            
                1.85
             | 
            
                1.84
             |                     
            
                1.72
             |                                 
            
                30,930
             |            
            
                 
             |                                       
         
    
        
            | 
                10/3/2019
             | 
            
                -0.05 / -2.63%
             |             
            
                1.93
             |           
            
                1.93
             |               
            
                1.85
             |                           
            
                1.85
             | 
            
                1.89
             |                     
            
                1.72
             |                                 
            
                21,160
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/2/2019
             | 
            
                -0.04 / -2.06%
             |             
            
                1.94
             |           
            
                1.94
             |               
            
                1.87
             |                           
            
                1.90
             | 
            
                1.88
             |                     
            
                1.77
             |                                 
            
                82,590
             |            
            
                 
             |                                       
         
    
        
            | 
                10/1/2019
             | 
            
                +0.04 / +2.11%
             |             
            
                1.99
             |           
            
                1.99
             |               
            
                1.90
             |                           
            
                1.94
             | 
            
                1.92
             |                     
            
                1.81
             |                                 
            
                90,280
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/30/2019
             | 
            
                +0.01 / +0.53%
             |             
            
                1.89
             |           
            
                1.98
             |               
            
                1.88
             |                           
            
                1.90
             | 
            
                1.93
             |                     
            
                1.77
             |                                 
            
                178,230
             |            
            
                 
             |                                       
         
    
        
            | 
                9/27/2019
             | 
            
                -0.07 / -3.57%
             |             
            
                1.97
             |           
            
                1.97
             |               
            
                1.88
             |                           
            
                1.89
             | 
            
                1.89
             |                     
            
                1.76
             |                                 
            
                101,430
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/26/2019
             | 
            
                +0.01 / +0.51%
             |             
            
                1.98
             |           
            
                1.98
             |               
            
                1.93
             |                           
            
                1.96
             | 
            
                1.96
             |                     
            
                1.82
             |                                 
            
                5,300
             |            
            
                 
             |                                       
         
    
        
            | 
                9/25/2019
             | 
            
                -0.04 / -2.01%
             |             
            
                1.98
             |           
            
                2.02
             |               
            
                1.86
             |                           
            
                1.95
             | 
            
                1.92
             |                     
            
                1.82
             |                                 
            
                132,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/24/2019
             | 
            
                +0.02 / +1.02%
             |             
            
                2.02
             |           
            
                2.02
             |               
            
                1.96
             |                           
            
                1.99
             | 
            
                1.97
             |                     
            
                1.85
             |                                 
            
                53,710
             |            
            
                 
             |                                       
         
    
        
            | 
                9/23/2019
             | 
            
                -0.01 / -0.51%
             |             
            
                2.00
             |           
            
                2.05
             |               
            
                1.97
             |                           
            
                1.97
             | 
            
                2.01
             |                     
            
                1.83
             |                                 
            
                181,910
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/20/2019
             | 
            
                -0.02 / -1.00%
             |             
            
                2.05
             |           
            
                2.05
             |               
            
                1.97
             |                           
            
                1.98
             | 
            
                1.99
             |                     
            
                1.84
             |                                 
            
                87,140
             |            
            
                 
             |                                       
         
    
        
            | 
                9/19/2019
             | 
            
                +0.01 / +0.50%
             |             
            
                2.04
             |           
            
                2.04
             |               
            
                1.95
             |                           
            
                2.00
             | 
            
                1.98
             |                     
            
                1.86
             |                                 
            
                63,740
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/18/2019
             | 
            
                +0.02 / +1.02%
             |             
            
                2.00
             |           
            
                2.05
             |               
            
                1.99
             |                           
            
                1.99
             | 
            
                2.01
             |                     
            
                1.85
             |                                 
            
                89,410
             |            
            
                 
             |                                       
         
    
        
            | 
                9/17/2019
             | 
            
                -0.08 / -3.90%
             |             
            
                2.00
             |           
            
                2.05
             |               
            
                1.96
             |                           
            
                1.97
             | 
            
                2.00
             |                     
            
                1.83
             |                                 
            
                164,220
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/16/2019
             | 
            
                -0.07 / -3.30%
             |             
            
                2.19
             |           
            
                2.19
             |               
            
                2.03
             |                           
            
                2.05
             | 
            
                2.07
             |                     
            
                1.91
             |                                 
            
                70,960
             |            
            
                 
             |                                       
         
    
        
            | 
                9/13/2019
             | 
            
                -0.02 / -0.93%
             |             
            
                2.15
             |           
            
                2.15
             |               
            
                2.10
             |                           
            
                2.12
             | 
            
                2.13
             |                     
            
                1.97
             |                                 
            
                156,580
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/12/2019
             | 
            
                +0.11 / +5.42%
             |             
            
                2.12
             |           
            
                2.17
             |               
            
                2.08
             |                           
            
                2.14
             | 
            
                2.16
             |                     
            
                1.99
             |                                 
            
                445,300
             |            
            
                 
             |                                       
         
    
        
            | 
                9/11/2019
             | 
            
                -0.06 / -2.87%
             |             
            
                1.98
             |           
            
                2.08
             |               
            
                1.95
             |                           
            
                2.03
             | 
            
                2.02
             |                     
            
                1.89
             |                                 
            
                110,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/10/2019
             | 
            
                -0.08 / -3.69%
             |             
            
                2.10
             |           
            
                2.21
             |               
            
                2.02
             |                           
            
                2.09
             | 
            
                2.04
             |                     
            
                1.95
             |                                 
            
                857,080
             |            
            
                 
             |                                       
         
    
        
            | 
                9/9/2019
             | 
            
                -0.03 / -1.36%
             |             
            
                2.30
             |           
            
                2.30
             |               
            
                2.15
             |                           
            
                2.17
             | 
            
                2.22
             |                     
            
                2.02
             |                                 
            
                192,250
             |  
            
                 
             |                                                              
             
    
        			
            | 
                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
             |  
            
                 
             |                                                              
             
    
         
    
    
 |