| 
                 
                    Closing price on 11/6/2019
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    3.30 | 
                 
                
                    | High | 
                    3.50 | 
                 
                
                    | Low | 
                    3.30 | 
                     
                
                    | Volume | 
                    270,600 | 
                                 
                
                    | Split-adjusted Price | 
                    2.74 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
MST Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                11/6/2019
             | 
            
                +0.20 / +6.06%
             |             
            
                3.30
             |           
            
                3.50
             |               
            
                3.30
             |                           
            
                3.50
             | 
            
                3.38
             |                     
            
                2.74
             |                                 
            
                270,600
             |            
            
                 
             |                                       
         
    
        
            | 
                11/5/2019
             | 
            
                -0.20 / -5.71%
             |             
            
                3.40
             |           
            
                3.50
             |               
            
                3.30
             |                           
            
                3.30
             | 
            
                3.36
             |                     
            
                2.58
             |                                 
            
                511,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/4/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.40
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.46
             |                     
            
                2.74
             |                                 
            
                163,400
             |            
            
                 
             |                                       
         
    
        
            | 
                11/1/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.40
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.42
             |                     
            
                2.74
             |                                 
            
                224,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/31/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.50
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.49
             |                     
            
                2.74
             |                                 
            
                343,300
             |            
            
                 
             |                                       
         
    
        
            | 
                10/30/2019
             | 
            
                -0.10 / -2.78%
             |             
            
                3.50
             |           
            
                3.60
             |               
            
                3.50
             |                           
            
                3.50
             | 
            
                3.50
             |                     
            
                2.74
             |                                 
            
                132,200
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/29/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.50
             |           
            
                3.60
             |               
            
                3.50
             |                           
            
                3.60
             | 
            
                3.57
             |                     
            
                2.82
             |                                 
            
                146,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/28/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.50
             |           
            
                3.60
             |               
            
                3.50
             |                           
            
                3.60
             | 
            
                3.54
             |                     
            
                2.82
             |                                 
            
                125,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/25/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.70
             |           
            
                3.70
             |               
            
                3.50
             |                           
            
                3.60
             | 
            
                3.59
             |                     
            
                2.82
             |                                 
            
                164,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/24/2019
             | 
            
                -0.10 / -2.70%
             |             
            
                3.70
             |           
            
                3.70
             |               
            
                3.60
             |                           
            
                3.60
             | 
            
                3.63
             |                     
            
                2.82
             |                                 
            
                121,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/23/2019
             | 
            
                +0.10 / +2.78%
             |             
            
                3.70
             |           
            
                3.70
             |               
            
                3.50
             |                           
            
                3.70
             | 
            
                3.62
             |                     
            
                2.90
             |                                 
            
                128,300
             |            
            
                 
             |                                       
         
    
        
            | 
                10/22/2019
             | 
            
                -0.10 / -2.70%
             |             
            
                3.70
             |           
            
                3.70
             |               
            
                3.60
             |                           
            
                3.60
             | 
            
                3.60
             |                     
            
                2.82
             |                                 
            
                220,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/21/2019
             | 
            
                +0.10 / +2.78%
             |             
            
                3.60
             |           
            
                3.70
             |               
            
                3.60
             |                           
            
                3.70
             | 
            
                3.66
             |                     
            
                2.90
             |                                 
            
                336,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/18/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.60
             |           
            
                3.70
             |               
            
                3.50
             |                           
            
                3.60
             | 
            
                3.60
             |                     
            
                2.82
             |                                 
            
                266,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/17/2019
             | 
            
                +0.10 / +2.86%
             |             
            
                3.50
             |           
            
                3.60
             |               
            
                3.50
             |                           
            
                3.60
             | 
            
                3.54
             |                     
            
                2.82
             |                                 
            
                402,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/16/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.50
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.43
             |                     
            
                2.74
             |                                 
            
                192,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/15/2019
             | 
            
                +0.10 / +2.94%
             |             
            
                3.40
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.42
             |                     
            
                2.74
             |                                 
            
                82,900
             |            
            
                 
             |                                       
         
    
        
            | 
                10/14/2019
             | 
            
                -0.10 / -2.86%
             |             
            
                3.50
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.40
             | 
            
                3.43
             |                     
            
                2.66
             |                                 
            
                112,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/11/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.50
             |           
            
                3.60
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.47
             |                     
            
                2.74
             |                                 
            
                94,100
             |            
            
                 
             |                                       
         
    
        
            | 
                10/10/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.50
             |           
            
                3.60
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.50
             |                     
            
                2.74
             |                                 
            
                172,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/9/2019
             | 
            
                +0.10 / +2.94%
             |             
            
                3.40
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.43
             |                     
            
                2.74
             |                                 
            
                91,300
             |            
            
                 
             |                                       
         
    
        
            | 
                10/8/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.40
             |           
            
                3.50
             |               
            
                3.30
             |                           
            
                3.40
             | 
            
                3.40
             |                     
            
                2.66
             |                                 
            
                161,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/7/2019
             | 
            
                -0.10 / -2.86%
             |             
            
                3.50
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.40
             | 
            
                3.40
             |                     
            
                2.66
             |                                 
            
                177,600
             |            
            
                 
             |                                       
         
    
        
            | 
                10/4/2019
             | 
            
                +0.10 / +2.94%
             |             
            
                3.40
             |           
            
                3.50
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.42
             |                     
            
                2.74
             |                                 
            
                107,500
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/3/2019
             | 
            
                -0.10 / -2.86%
             |             
            
                3.40
             |           
            
                3.40
             |               
            
                3.30
             |                           
            
                3.40
             | 
            
                3.40
             |                     
            
                2.66
             |                                 
            
                98,000
             |            
            
                 
             |                                       
         
    
        
            | 
                10/2/2019
             | 
            
                -0.10 / -2.78%
             |             
            
                3.60
             |           
            
                3.60
             |               
            
                3.40
             |                           
            
                3.50
             | 
            
                3.44
             |                     
            
                2.74
             |                                 
            
                524,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                10/1/2019
             | 
            
                +0.10 / +2.86%
             |             
            
                3.50
             |           
            
                3.60
             |               
            
                3.40
             |                           
            
                3.60
             | 
            
                3.54
             |                     
            
                2.82
             |                                 
            
                335,000
             |            
            
                 
             |                                       
         
    
        
            | 
                9/30/2019
             | 
            
                +0.10 / +2.94%
             |             
            
                3.50
             |           
            
                3.50
             |               
            
                3.30
             |                           
            
                3.50
             | 
            
                3.41
             |                     
            
                2.74
             |                                 
            
                250,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                9/27/2019
             | 
            
                +0.20 / +6.25%
             |             
            
                3.30
             |           
            
                3.40
             |               
            
                3.20
             |                           
            
                3.40
             | 
            
                3.31
             |                     
            
                2.66
             |                                 
            
                321,100
             |            
            
                 
             |                                       
         
    
        
            | 
                9/26/2019
             | 
            
                0.00 / 0.00%
             |             
            
                3.20
             |           
            
                3.30
             |               
            
                3.20
             |                           
            
                3.20
             | 
            
                3.21
             |                     
            
                2.51
             |                                 
            
                193,300
             |  
            
                 
             |                                                              
             
    
         
    
    
 |