| 
                 
                    Closing price on 1/30/2020
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    5.10 | 
                 
                
                    | High | 
                    5.20 | 
                 
                
                    | Low | 
                    5.10 | 
                     
                
                    | Volume | 
                    124,000 | 
                                 
                
                    | Split-adjusted Price | 
                    4.07 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
MST Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                1/30/2020
             | 
            
                0.00 / 0.00%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.17
             |                     
            
                4.07
             |                                 
            
                124,000
             |            
            
                 
             |                                       
         
    
        
            | 
                1/22/2020
             | 
            
                0.00 / 0.00%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.16
             |                     
            
                4.07
             |                                 
            
                135,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/21/2020
             | 
            
                +0.10 / +1.96%
             |             
            
                5.00
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.20
             | 
            
                5.18
             |                     
            
                4.07
             |                                 
            
                117,400
             |            
            
                 
             |                                       
         
    
        
            | 
                1/20/2020
             | 
            
                -0.10 / -1.92%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.10
             |                           
            
                5.10
             | 
            
                5.15
             |                     
            
                3.99
             |                                 
            
                162,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/17/2020
             | 
            
                +0.10 / +1.96%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.18
             |                     
            
                4.07
             |                                 
            
                196,800
             |            
            
                 
             |                                       
         
    
        
            | 
                1/16/2020
             | 
            
                -0.10 / -1.92%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.10
             |                           
            
                5.10
             | 
            
                5.13
             |                     
            
                3.99
             |                                 
            
                185,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/15/2020
             | 
            
                -0.10 / -1.89%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                4.07
             |                                 
            
                448,900
             |            
            
                 
             |                                       
         
    
        
            | 
                1/14/2020
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.23
             |                     
            
                4.15
             |                                 
            
                237,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/13/2020
             | 
            
                +0.10 / +1.92%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.24
             |                     
            
                4.15
             |                                 
            
                137,100
             |            
            
                 
             |                                       
         
    
        
            | 
                1/10/2020
             | 
            
                -0.10 / -1.89%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.20
             | 
            
                5.27
             |                     
            
                4.07
             |                                 
            
                325,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/9/2020
             | 
            
                +0.10 / +1.92%
             |             
            
                5.10
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.30
             | 
            
                5.22
             |                     
            
                4.15
             |                                 
            
                248,040
             |            
            
                 
             |                                       
         
    
        
            | 
                1/8/2020
             | 
            
                0.00 / 0.00%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.20
             | 
            
                5.15
             |                     
            
                4.07
             |                                 
            
                392,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/7/2020
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.21
             |                     
            
                4.07
             |                                 
            
                253,500
             |            
            
                 
             |                                       
         
    
        
            | 
                1/6/2020
             | 
            
                -0.10 / -1.89%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.20
             | 
            
                5.23
             |                     
            
                4.07
             |                                 
            
                180,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                1/3/2020
             | 
            
                0.00 / 0.00%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.28
             |                     
            
                4.15
             |                                 
            
                245,480
             |            
            
                 
             |                                       
         
    
        
            | 
                1/2/2020
             | 
            
                +0.10 / +1.92%
             |             
            
                5.10
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.30
             | 
            
                5.24
             |                     
            
                4.15
             |                                 
            
                319,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/31/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.10
             |           
            
                5.30
             |               
            
                5.00
             |                           
            
                5.20
             | 
            
                5.17
             |                     
            
                4.07
             |                                 
            
                387,700
             |            
            
                 
             |                                       
         
    
        
            | 
                12/30/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.14
             |                     
            
                4.07
             |                                 
            
                771,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/27/2019
             | 
            
                +0.10 / +1.96%
             |             
            
                5.00
             |           
            
                5.20
             |               
            
                5.00
             |                           
            
                5.20
             | 
            
                5.08
             |                     
            
                4.07
             |                                 
            
                446,700
             |            
            
                 
             |                                       
         
    
        
            | 
                12/26/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                5.00
             |                           
            
                5.10
             | 
            
                5.03
             |                     
            
                3.99
             |                                 
            
                698,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/25/2019
             | 
            
                +0.10 / +2.00%
             |             
            
                4.90
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                5.10
             | 
            
                5.03
             |                     
            
                3.99
             |                                 
            
                292,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/24/2019
             | 
            
                -0.10 / -1.96%
             |             
            
                5.10
             |           
            
                5.20
             |               
            
                4.90
             |                           
            
                5.00
             | 
            
                4.96
             |                     
            
                3.92
             |                                 
            
                660,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/23/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.00
             |           
            
                5.20
             |               
            
                4.90
             |                           
            
                5.10
             | 
            
                5.04
             |                     
            
                3.99
             |                                 
            
                309,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/20/2019
             | 
            
                +0.40 / +8.51%
             |             
            
                4.70
             |           
            
                5.10
             |               
            
                4.50
             |                           
            
                5.10
             | 
            
                4.83
             |                     
            
                3.99
             |                                 
            
                599,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/19/2019
             | 
            
                -0.50 / -9.62%
             |             
            
                5.20
             |           
            
                5.20
             |               
            
                4.70
             |                           
            
                4.70
             | 
            
                4.86
             |                     
            
                3.68
             |                                 
            
                706,900
             |            
            
                 
             |                                       
         
    
        
            | 
                12/18/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.20
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.20
             | 
            
                5.20
             |                     
            
                4.07
             |                                 
            
                552,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/17/2019
             | 
            
                -0.10 / -1.89%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.20
             |                           
            
                5.20
             | 
            
                5.21
             |                     
            
                4.07
             |                                 
            
                388,300
             |            
            
                 
             |                                       
         
    
        
            | 
                12/16/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.30
             |           
            
                5.40
             |               
            
                5.20
             |                           
            
                5.30
             | 
            
                5.26
             |                     
            
                4.15
             |                                 
            
                413,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/13/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                5.10
             |                           
            
                5.30
             | 
            
                5.22
             |                     
            
                4.15
             |                                 
            
                845,600
             |            
            
                 
             |                                       
         
    
        
            | 
                12/12/2019
             | 
            
                0.00 / 0.00%
             |             
            
                5.30
             |           
            
                5.40
             |               
            
                5.10
             |                           
            
                5.30
             | 
            
                5.24
             |                     
            
                4.15
             |                                 
            
                524,700
             |  
            
                 
             |                                                              
             
    
         
    
    
 |