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                    Closing price on 12/26/2017
                 
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             | 
         
         
 
    
        
                      
                
                    | Open | 
                    3.70 | 
                 
                
                    | High | 
                    4.30 | 
                 
                
                    | Low | 
                    3.70 | 
                     
                
                    | Volume | 
                    1,616,500 | 
                                 
                
                    | Split-adjusted Price | 
                    2.66 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
MST Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                12/26/2017
             | 
            
                -0.20 / -4.88%
             |             
            
                3.70
             |           
            
                4.30
             |               
            
                3.70
             |                           
            
                3.90
             | 
            
                3.98
             |                     
            
                2.66
             |                                 
            
                1,616,500
             |            
            
                 
             |                                       
         
    
        
            | 
                12/25/2017
             | 
            
                -0.40 / -8.89%
             |             
            
                4.10
             |           
            
                4.50
             |               
            
                4.10
             |                           
            
                4.10
             | 
            
                4.10
             |                     
            
                2.80
             |                                 
            
                1,080,511
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/22/2017
             | 
            
                -0.40 / -8.16%
             |             
            
                4.50
             |           
            
                4.90
             |               
            
                4.50
             |                           
            
                4.50
             | 
            
                4.50
             |                     
            
                3.07
             |                                 
            
                1,398,900
             |            
            
                 
             |                                       
         
    
        
            | 
                12/21/2017
             | 
            
                -0.40 / -7.55%
             |             
            
                5.30
             |           
            
                5.30
             |               
            
                4.80
             |                           
            
                4.90
             | 
            
                4.83
             |                     
            
                3.34
             |                                 
            
                1,931,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/20/2017
             | 
            
                +0.40 / +8.16%
             |             
            
                4.50
             |           
            
                5.30
             |               
            
                4.50
             |                           
            
                5.30
             | 
            
                4.67
             |                     
            
                3.62
             |                                 
            
                3,452,000
             |            
            
                 
             |                                       
         
    
        
            | 
                12/19/2017
             | 
            
                -0.50 / -9.26%
             |             
            
                5.00
             |           
            
                5.10
             |               
            
                4.90
             |                           
            
                4.90
             | 
            
                4.91
             |                     
            
                3.34
             |                                 
            
                767,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/18/2017
             | 
            
                -0.50 / -8.47%
             |             
            
                5.40
             |           
            
                5.50
             |               
            
                5.40
             |                           
            
                5.40
             | 
            
                5.40
             |                     
            
                3.68
             |                                 
            
                1,111,300
             |            
            
                 
             |                                       
         
    
        
            | 
                12/15/2017
             | 
            
                -0.60 / -9.23%
             |             
            
                6.00
             |           
            
                6.10
             |               
            
                5.90
             |                           
            
                5.90
             | 
            
                5.90
             |                     
            
                4.02
             |                                 
            
                1,800,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/14/2017
             | 
            
                -0.70 / -9.72%
             |             
            
                7.90
             |           
            
                7.90
             |               
            
                6.50
             |                           
            
                6.50
             | 
            
                6.57
             |                     
            
                4.43
             |                                 
            
                1,527,100
             |            
            
                 
             |                                       
         
    
        
            | 
                12/13/2017
             | 
            
                +0.60 / +9.09%
             |             
            
                6.00
             |           
            
                7.20
             |               
            
                6.00
             |                           
            
                7.20
             | 
            
                6.23
             |                     
            
                4.91
             |                                 
            
                2,500,800
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/12/2017
             | 
            
                -0.70 / -9.59%
             |             
            
                7.30
             |           
            
                7.30
             |               
            
                6.60
             |                           
            
                6.60
             | 
            
                6.61
             |                     
            
                4.50
             |                                 
            
                1,071,200
             |            
            
                 
             |                                       
         
    
        
            | 
                12/11/2017
             | 
            
                -0.40 / -5.19%
             |             
            
                7.60
             |           
            
                7.60
             |               
            
                7.00
             |                           
            
                7.30
             | 
            
                7.00
             |                     
            
                4.98
             |                                 
            
                2,268,900
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/8/2017
             | 
            
                -0.80 / -9.41%
             |             
            
                8.00
             |           
            
                8.00
             |               
            
                7.70
             |                           
            
                7.70
             | 
            
                7.71
             |                     
            
                5.25
             |                                 
            
                124,200
             |            
            
                 
             |                                       
         
    
        
            | 
                12/7/2017
             | 
            
                -0.90 / -9.57%
             |             
            
                9.00
             |           
            
                9.00
             |               
            
                8.50
             |                           
            
                8.50
             | 
            
                8.51
             |                     
            
                5.80
             |                                 
            
                1,092,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/6/2017
             | 
            
                0.00 / 0.00%
             |             
            
                8.50
             |           
            
                9.40
             |               
            
                8.50
             |                           
            
                9.40
             | 
            
                8.51
             |                     
            
                6.41
             |                                 
            
                4,822,100
             |            
            
                 
             |                                       
         
    
        
            | 
                12/5/2017
             | 
            
                -1.00 / -9.62%
             |             
            
                9.40
             |           
            
                9.40
             |               
            
                9.40
             |                           
            
                9.40
             | 
            
                9.40
             |                     
            
                6.41
             |                                 
            
                918,300
             |  
            
                 
             |                                                              
             
    
        			
            | 
                12/4/2017
             | 
            
                -1.10 / -9.57%
             |             
            
                11.20
             |           
            
                11.50
             |               
            
                10.40
             |                           
            
                10.40
             | 
            
                10.48
             |                     
            
                7.09
             |                                 
            
                169,400
             |            
            
                 
             |                                       
         
    
        
            | 
                12/1/2017
             | 
            
                -0.90 / -7.26%
             |             
            
                12.60
             |           
            
                12.60
             |               
            
                11.50
             |                           
            
                11.50
             | 
            
                12.23
             |                     
            
                7.85
             |                                 
            
                332,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/30/2017
             | 
            
                -0.60 / -4.62%
             |             
            
                13.00
             |           
            
                13.00
             |               
            
                12.40
             |                           
            
                12.40
             | 
            
                12.71
             |                     
            
                8.46
             |                                 
            
                559,700
             |            
            
                 
             |                                       
         
    
        
            | 
                11/29/2017
             | 
            
                -0.40 / -2.99%
             |             
            
                13.40
             |           
            
                13.40
             |               
            
                12.50
             |                           
            
                13.00
             | 
            
                12.99
             |                     
            
                8.87
             |                                 
            
                573,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/28/2017
             | 
            
                -0.50 / -3.60%
             |             
            
                13.80
             |           
            
                13.90
             |               
            
                12.70
             |                           
            
                13.40
             | 
            
                13.28
             |                     
            
                9.14
             |                                 
            
                378,600
             |            
            
                 
             |                                       
         
    
        
            | 
                11/27/2017
             | 
            
                +0.20 / +1.46%
             |             
            
                13.90
             |           
            
                14.00
             |               
            
                13.00
             |                           
            
                13.90
             | 
            
                13.63
             |                     
            
                9.48
             |                                 
            
                1,080,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/24/2017
             | 
            
                +1.10 / +8.73%
             |             
            
                12.50
             |           
            
                13.80
             |               
            
                11.40
             |                           
            
                13.70
             | 
            
                12.56
             |                     
            
                9.35
             |                                 
            
                352,700
             |            
            
                 
             |                                       
         
    
        
            | 
                11/23/2017
             | 
            
                -1.30 / -9.35%
             |             
            
                14.20
             |           
            
                14.20
             |               
            
                12.60
             |                           
            
                12.60
             | 
            
                13.13
             |                     
            
                8.60
             |                                 
            
                358,600
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/22/2017
             | 
            
                -0.30 / -2.11%
             |             
            
                14.10
             |           
            
                14.20
             |               
            
                13.80
             |                           
            
                13.90
             | 
            
                13.95
             |                     
            
                9.48
             |                                 
            
                142,800
             |            
            
                 
             |                                       
         
    
        
            | 
                11/21/2017
             | 
            
                -0.10 / -0.70%
             |             
            
                14.30
             |           
            
                14.30
             |               
            
                14.20
             |                           
            
                14.20
             | 
            
                14.23
             |                     
            
                9.69
             |                                 
            
                257,000
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/20/2017
             | 
            
                +0.20 / +1.42%
             |             
            
                14.10
             |           
            
                14.50
             |               
            
                14.10
             |                           
            
                14.30
             | 
            
                14.30
             |                     
            
                9.76
             |                                 
            
                167,400
             |            
            
                 
             |                                       
         
    
        
            | 
                11/17/2017
             | 
            
                -0.60 / -4.08%
             |             
            
                14.90
             |           
            
                14.90
             |               
            
                14.00
             |                           
            
                14.10
             | 
            
                14.33
             |                     
            
                9.62
             |                                 
            
                414,700
             |  
            
                 
             |                                                              
             
    
        			
            | 
                11/16/2017
             | 
            
                0.00 / 0.00%
             |             
            
                14.70
             |           
            
                14.80
             |               
            
                14.60
             |                           
            
                14.70
             | 
            
                14.71
             |                     
            
                10.03
             |                                 
            
                518,500
             |            
            
                 
             |                                       
         
    
        
            | 
                11/15/2017
             | 
            
                0.00 / 0.00%
             |             
            
                14.70
             |           
            
                14.80
             |               
            
                14.40
             |                           
            
                14.70
             | 
            
                14.55
             |                     
            
                10.03
             |                                 
            
                399,800
             |  
            
                 
             |                                                              
             
    
         
    
    
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						| 
 Market Update 
        
            
                Last updated at 3:10:02 PM
                                                                
            
            
            
            
        
        
     
 
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