| 
                 
                    Closing price on 12/23/2020
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    7.20 | 
                 
                
                    | High | 
                    7.30 | 
                 
                
                    | Low | 
                    7.00 | 
                     
                
                    | Volume | 
                    60,500 | 
                                 
                
                    | Split-adjusted Price | 
                    5.84 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
NST Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/23/2020
             | 
            
                +0.10 / +1.41%
             |             
            
                7.20
             |           
            
                7.30
             |               
            
                7.00
             |                           
            
                7.20
             | 
            
                7.12
             |                     
            
                5.84
             |                                 
            
                60,500
             |            
            
                 
             |                                       
         
    
        
            | 
                12/22/2020
             | 
            
                0.00 / 0.00%
             |             
            
                7.00
             |           
            
                7.20
             |               
            
                6.80
             |                           
            
                7.10
             | 
            
                6.94
             |                     
            
                5.76
             |                                 
            
                25,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/21/2020
             | 
            
                0.00 / 0.00%
             |             
            
                7.10
             |           
            
                7.20
             |               
            
                6.90
             |                           
            
                7.10
             | 
            
                6.98
             |                     
            
                5.76
             |                                 
            
                40,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/18/2020
             | 
            
                -0.10 / -1.39%
             |             
            
                7.10
             |           
            
                7.20
             |               
            
                6.80
             |                           
            
                7.10
             | 
            
                7.11
             |                     
            
                5.76
             |                                 
            
                19,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/17/2020
             | 
            
                +0.30 / +4.35%
             |             
            
                6.80
             |           
            
                7.30
             |               
            
                6.50
             |                           
            
                7.20
             | 
            
                6.91
             |                     
            
                5.84
             |                                 
            
                81,900
             |            
            
                 
             |                                       
         
    
        
            | 
                12/16/2020
             | 
            
                -0.10 / -1.43%
             |             
            
                6.80
             |           
            
                6.90
             |               
            
                6.70
             |                           
            
                6.90
             | 
            
                6.81
             |                     
            
                5.60
             |                                 
            
                24,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/15/2020
             | 
            
                -0.10 / -1.41%
             |             
            
                6.90
             |           
            
                7.00
             |               
            
                6.90
             |                           
            
                7.00
             | 
            
                6.95
             |                     
            
                5.68
             |                                 
            
                10,200
             |            
            
                 
             |                                       
         
    
        
            | 
                12/14/2020
             | 
            
                +0.20 / +2.90%
             |             
            
                6.80
             |           
            
                7.10
             |               
            
                6.80
             |                           
            
                7.10
             | 
            
                7.06
             |                     
            
                5.76
             |                                 
            
                6,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/11/2020
             | 
            
                -0.20 / -2.82%
             |             
            
                6.90
             |           
            
                7.00
             |               
            
                6.80
             |                           
            
                6.90
             | 
            
                6.94
             |                     
            
                5.60
             |                                 
            
                31,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/10/2020
             | 
            
                -0.40 / -5.33%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.10
             |                           
            
                7.10
             | 
            
                7.17
             |                     
            
                5.76
             |                                 
            
                1,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/9/2020
             | 
            
                -0.70 / -8.54%
             |             
            
                7.40
             |           
            
                7.60
             |               
            
                7.40
             |                           
            
                7.50
             | 
            
                7.43
             |                     
            
                6.08
             |                                 
            
                4,700
             |            
            
                 
             |                                       
         
    
        
            | 
                12/8/2020
             | 
            
                +0.60 / +7.89%
             |             
            
                7.30
             |           
            
                8.30
             |               
            
                6.90
             |                           
            
                8.20
             | 
            
                7.00
             |                     
            
                6.65
             |                                 
            
                545,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/7/2020
             | 
            
                -0.80 / -9.52%
             |             
            
                7.60
             |           
            
                8.00
             |               
            
                7.60
             |                           
            
                7.60
             | 
            
                7.62
             |                     
            
                6.16
             |                                 
            
                28,900
             |            
            
                 
             |                                       
         
    
        
            | 
                12/4/2020
             | 
            
                +0.30 / +3.70%
             |             
            
                7.70
             |           
            
                8.40
             |               
            
                7.30
             |                           
            
                8.40
             | 
            
                7.34
             |                     
            
                6.81
             |                                 
            
                56,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/3/2020
             | 
            
                -0.90 / -10.00%
             |             
            
                8.10
             |           
            
                8.10
             |               
            
                8.10
             |                           
            
                8.10
             | 
            
                8.10
             |                     
            
                6.57
             |                                 
            
                7,800
             |            
            
                 
             |                                       
         
    
        
            | 
                12/2/2020
             | 
            
                -0.90 / -9.09%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                9.00
             |                           
            
                9.00
             | 
            
                9.00
             |                     
            
                7.30
             |                                 
            
                300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/1/2020
             | 
            
                0.00 / 0.00%
             |             
            
                9.90
             |           
            
                9.90
             |               
            
                9.90
             |                           
            
                9.90
             | 
            
                9.90
             |                     
            
                8.03
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                11/30/2020
             | 
            
                +0.80 / +8.79%
             |             
            
                8.50
             |           
            
                9.90
             |               
            
                8.20
             |                           
            
                9.90
             | 
            
                8.84
             |                     
            
                8.03
             |                                 
            
                6,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/27/2020
             | 
            
                0.00 / 0.00%
             |             
            
                8.90
             |           
            
                9.10
             |               
            
                8.20
             |                           
            
                9.10
             | 
            
                8.37
             |                     
            
                7.38
             |                                 
            
                35,900
             |            
            
                 
             |                                       
         
    
        
            | 
                11/26/2020
             | 
            
                +0.80 / +9.64%
             |             
            
                7.60
             |           
            
                9.10
             |               
            
                7.50
             |                           
            
                9.10
             | 
            
                7.55
             |                     
            
                7.38
             |                                 
            
                171,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/25/2020
             | 
            
                0.00 / 0.00%
             |             
            
                8.30
             |           
            
                8.30
             |               
            
                8.30
             |                           
            
                8.30
             | 
            
                8.30
             |                     
            
                6.73
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                11/24/2020
             | 
            
                0.00 / 0.00%
             |             
            
                8.30
             |           
            
                8.30
             |               
            
                8.30
             |                           
            
                8.30
             | 
            
                8.30
             |                     
            
                6.73
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/23/2020
             | 
            
                +0.30 / +3.75%
             |             
            
                8.30
             |           
            
                8.30
             |               
            
                8.30
             |                           
            
                8.30
             | 
            
                8.30
             |                     
            
                6.73
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                11/20/2020
             | 
            
                0.00 / 0.00%
             |             
            
                7.90
             |           
            
                8.00
             |               
            
                7.90
             |                           
            
                8.00
             | 
            
                7.95
             |                     
            
                6.49
             |                                 
            
                200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/19/2020
             | 
            
                0.00 / 0.00%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                8.00
             |                           
            
                8.00
             | 
            
                8.00
             |                     
            
                6.49
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                11/18/2020
             | 
            
                +0.30 / +3.90%
             |             
            
                7.60
             |           
            
                8.00
             |               
            
                7.60
             |                           
            
                8.00
             | 
            
                7.70
             |                     
            
                6.49
             |                                 
            
                400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/17/2020
             | 
            
                0.00 / 0.00%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.70
             |                           
            
                7.70
             | 
            
                7.70
             |                     
            
                6.24
             |                                 
            
                0
             |            
            
                 
             |                                       
         
    
        
            | 
                11/16/2020
             | 
            
                0.00 / 0.00%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.70
             |                           
            
                7.70
             | 
            
                7.70
             |                     
            
                6.24
             |                                 
            
                0
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/13/2020
             | 
            
                +0.40 / +5.48%
             |             
            
                7.70
             |           
            
                7.70
             |               
            
                7.70
             |                           
            
                7.70
             | 
            
                7.70
             |                     
            
                6.24
             |                                 
            
                100
             |            
            
                 
             |                                       
         
    
        
            | 
                11/12/2020
             | 
            
                -0.80 / -9.88%
             |             
            
                7.50
             |           
            
                7.50
             |               
            
                7.30
             |                           
            
                7.30
             | 
            
                7.33
             |                     
            
                5.92
             |                                 
            
                14,500
             |  
            
                 
             |                                                              
             
    
         
    
    
 |