| 
                 
                    Closing price on 5/15/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    28.00 | 
                 
                
                    | High | 
                    28.10 | 
                 
                
                    | Low | 
                    27.80 | 
                     
                
                    | Volume | 
                    5,700 | 
                                 
                
                    | Split-adjusted Price | 
                    9.62 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
VTK Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/15/2019
             | 
            
                +0.40 / +1.45%
             |             
            
                28.00
             |           
            
                28.10
             |               
            
                27.80
             |                           
            
                27.90
             | 
            
                27.99
             |                     
            
                9.62
             |                                 
            
                5,700
             |            
            
                 
             |                                       
         
    
        
            | 
                5/14/2019
             | 
            
                -0.80 / -2.83%
             |             
            
                27.80
             |           
            
                28.10
             |               
            
                27.50
             |                           
            
                27.50
             | 
            
                27.89
             |                     
            
                9.48
             |                                 
            
                9,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/13/2019
             | 
            
                +0.60 / +2.17%
             |             
            
                27.70
             |           
            
                28.90
             |               
            
                27.70
             |                           
            
                28.30
             | 
            
                28.08
             |                     
            
                9.76
             |                                 
            
                13,200
             |            
            
                 
             |                                       
         
    
        
            | 
                5/10/2019
             | 
            
                -0.60 / -2.14%
             |             
            
                28.30
             |           
            
                28.30
             |               
            
                27.50
             |                           
            
                27.50
             | 
            
                27.65
             |                     
            
                9.48
             |                                 
            
                10,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/9/2019
             | 
            
                +0.40 / +1.44%
             |             
            
                28.90
             |           
            
                29.00
             |               
            
                28.00
             |                           
            
                28.10
             | 
            
                28.45
             |                     
            
                9.69
             |                                 
            
                10,000
             |            
            
                 
             |                                       
         
    
        
            | 
                5/8/2019
             | 
            
                +0.60 / +2.21%
             |             
            
                26.80
             |           
            
                28.70
             |               
            
                26.80
             |                           
            
                27.70
             | 
            
                27.70
             |                     
            
                9.55
             |                                 
            
                16,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/7/2019
             | 
            
                +0.10 / +0.37%
             |             
            
                27.00
             |           
            
                27.10
             |               
            
                27.00
             |                           
            
                27.10
             | 
            
                27.06
             |                     
            
                9.34
             |                                 
            
                1,200
             |            
            
                 
             |                                       
         
    
        
            | 
                5/6/2019
             | 
            
                -0.70 / -2.53%
             |             
            
                27.00
             |           
            
                27.00
             |               
            
                27.00
             |                           
            
                27.00
             | 
            
                27.00
             |                     
            
                9.31
             |                                 
            
                1,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/3/2019
             | 
            
                -0.30 / -1.08%
             |             
            
                28.00
             |           
            
                28.00
             |               
            
                27.50
             |                           
            
                27.50
             | 
            
                27.74
             |                     
            
                9.48
             |                                 
            
                1,600
             |            
            
                 
             |                                       
         
    
        
            | 
                5/2/2019
             | 
            
                -0.20 / -0.71%
             |             
            
                28.00
             |           
            
                28.10
             |               
            
                27.70
             |                           
            
                27.80
             | 
            
                27.99
             |                     
            
                9.58
             |                                 
            
                8,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/26/2019
             | 
            
                +0.30 / +1.08%
             |             
            
                29.00
             |           
            
                29.00
             |               
            
                27.30
             |                           
            
                28.20
             | 
            
                27.97
             |                     
            
                9.72
             |                                 
            
                3,400
             |            
            
                 
             |                                       
         
    
        
            | 
                4/25/2019
             | 
            
                +0.90 / +3.33%
             |             
            
                28.00
             |           
            
                28.00
             |               
            
                26.50
             |                           
            
                27.90
             | 
            
                27.23
             |                     
            
                9.62
             |                                 
            
                11,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/24/2019
             | 
            
                0.00 / 0.00%
             |             
            
                26.60
             |           
            
                27.50
             |               
            
                26.10
             |                           
            
                27.00
             | 
            
                26.79
             |                     
            
                9.31
             |                                 
            
                9,500
             |            
            
                 
             |                                       
         
    
        
            | 
                4/23/2019
             | 
            
                -0.90 / -3.23%
             |             
            
                25.40
             |           
            
                27.00
             |               
            
                25.40
             |                           
            
                27.00
             | 
            
                26.60
             |                     
            
                9.31
             |                                 
            
                4,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/22/2019
             | 
            
                -0.20 / -0.71%
             |             
            
                29.00
             |           
            
                29.00
             |               
            
                25.00
             |                           
            
                27.90
             | 
            
                27.98
             |                     
            
                9.62
             |                                 
            
                7,800
             |            
            
                 
             |                                       
         
    
        
            | 
                4/19/2019
             | 
            
                -0.70 / -2.40%
             |             
            
                28.00
             |           
            
                29.00
             |               
            
                27.50
             |                           
            
                28.50
             | 
            
                28.06
             |                     
            
                9.82
             |                                 
            
                6,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/18/2019
             | 
            
                -0.50 / -1.68%
             |             
            
                30.00
             |           
            
                30.00
             |               
            
                28.80
             |                           
            
                29.20
             | 
            
                29.22
             |                     
            
                10.07
             |                                 
            
                25,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/17/2019
             | 
            
                -0.30 / -1.00%
             |             
            
                29.10
             |           
            
                31.00
             |               
            
                29.10
             |                           
            
                29.70
             | 
            
                29.93
             |                     
            
                10.24
             |                                 
            
                8,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/16/2019
             | 
            
                -1.40 / -4.46%
             |             
            
                31.50
             |           
            
                31.50
             |               
            
                30.00
             |                           
            
                30.00
             | 
            
                30.35
             |                     
            
                10.34
             |                                 
            
                5,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/12/2019
             | 
            
                +0.70 / +2.24%
             |             
            
                31.00
             |           
            
                32.00
             |               
            
                31.00
             |                           
            
                32.00
             | 
            
                31.36
             |                     
            
                11.03
             |                                 
            
                4,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/11/2019
             | 
            
                -0.20 / -0.63%
             |             
            
                29.50
             |           
            
                31.50
             |               
            
                29.50
             |                           
            
                31.30
             | 
            
                30.78
             |                     
            
                10.79
             |                                 
            
                11,700
             |            
            
                 
             |                                       
         
    
        
            | 
                4/10/2019
             | 
            
                +1.30 / +4.30%
             |             
            
                30.00
             |           
            
                31.50
             |               
            
                29.30
             |                           
            
                31.50
             | 
            
                29.70
             |                     
            
                10.86
             |                                 
            
                5,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/9/2019
             | 
            
                -1.80 / -5.63%
             |             
            
                30.10
             |           
            
                31.00
             |               
            
                30.00
             |                           
            
                30.20
             | 
            
                30.31
             |                     
            
                10.41
             |                                 
            
                8,000
             |            
            
                 
             |                                       
         
    
        
            | 
                4/8/2019
             | 
            
                +0.10 / +0.31%
             |             
            
                31.30
             |           
            
                32.20
             |               
            
                30.00
             |                           
            
                32.00
             | 
            
                30.93
             |                     
            
                11.03
             |                                 
            
                20,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/5/2019
             | 
            
                -1.10 / -3.32%
             |             
            
                32.10
             |           
            
                32.10
             |               
            
                31.60
             |                           
            
                32.00
             | 
            
                31.95
             |                     
            
                11.03
             |                                 
            
                14,300
             |            
            
                 
             |                                       
         
    
        
            | 
                4/4/2019
             | 
            
                -0.90 / -2.65%
             |             
            
                33.90
             |           
            
                34.00
             |               
            
                32.10
             |                           
            
                33.10
             | 
            
                33.29
             |                     
            
                11.41
             |                                 
            
                14,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/3/2019
             | 
            
                +2.00 / +6.25%
             |             
            
                32.00
             |           
            
                35.30
             |               
            
                32.00
             |                           
            
                34.00
             | 
            
                34.38
             |                     
            
                11.72
             |                                 
            
                30,200
             |            
            
                 
             |                                       
         
    
        
            | 
                4/2/2019
             | 
            
                +3.20 / +11.11%
             |             
            
                28.30
             |           
            
                32.00
             |               
            
                28.30
             |                           
            
                32.00
             | 
            
                30.74
             |                     
            
                11.03
             |                                 
            
                27,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/1/2019
             | 
            
                -1.30 / -4.32%
             |             
            
                28.20
             |           
            
                30.00
             |               
            
                28.20
             |                           
            
                28.80
             | 
            
                28.69
             |                     
            
                9.93
             |                                 
            
                10,300
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2019
             | 
            
                +0.30 / +1.01%
             |             
            
                29.10
             |           
            
                30.50
             |               
            
                29.10
             |                           
            
                30.10
             | 
            
                30.09
             |                     
            
                10.38
             |                                 
            
                20,000
             |  
            
                 
             |                                                              
             
    
         
    
    
 |