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            | 
                    Closing price on 7/10/2018
                 |  |  
    
        |           
                
                    | Open | 3.60 |  
                    | High | 3.80 |  
                    | Low | 3.60 |  
                    | Volume | 685,500 |  
                    | Split-adjusted Price | 2.52 |  
                
             | 
 |  MST Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 7/10/2018 | -0.10 / -2.63% | 3.60 | 3.80 | 3.60 | 3.70 | 3.71 | 2.52 | 685,500 |   |  
            | 7/9/2018 | 0.00 / 0.00% | 3.80 | 3.80 | 3.60 | 3.80 | 3.67 | 2.59 | 394,400 |   |  			
            | 7/6/2018 | +0.10 / +2.70% | 3.60 | 3.80 | 3.60 | 3.80 | 3.73 | 2.59 | 563,100 |   |  
            | 7/5/2018 | -0.10 / -2.63% | 3.70 | 3.80 | 3.50 | 3.70 | 3.61 | 2.52 | 151,900 |   |  			
            | 7/4/2018 | +0.30 / +8.57% | 3.50 | 3.80 | 3.50 | 3.80 | 3.67 | 2.59 | 192,800 |   |  
            | 7/3/2018 | -0.20 / -5.41% | 3.70 | 3.80 | 3.50 | 3.50 | 3.60 | 2.39 | 362,500 |   |  			
            | 7/2/2018 | -0.20 / -5.13% | 3.80 | 3.90 | 3.70 | 3.70 | 3.80 | 2.52 | 250,600 |   |  
            | 6/29/2018 | +0.20 / +5.41% | 3.70 | 3.90 | 3.60 | 3.90 | 3.79 | 2.66 | 401,800 |   |  			
            | 6/28/2018 | -0.30 / -7.50% | 4.00 | 4.00 | 3.70 | 3.70 | 3.86 | 2.52 | 388,700 |   |  
            | 6/27/2018 | +0.20 / +5.26% | 3.70 | 4.00 | 3.60 | 4.00 | 3.85 | 2.73 | 667,400 |   |  			
            | 6/26/2018 | -0.10 / -2.56% | 3.90 | 4.00 | 3.70 | 3.80 | 3.84 | 2.59 | 400,900 |   |  
            | 6/25/2018 | +0.20 / +5.41% | 3.70 | 3.90 | 3.60 | 3.90 | 3.80 | 2.66 | 796,400 |   |  			
            | 6/22/2018 | +0.20 / +5.71% | 3.50 | 3.70 | 3.50 | 3.70 | 3.57 | 2.52 | 520,300 |   |  
            | 6/21/2018 | 0.00 / 0.00% | 3.50 | 3.60 | 3.40 | 3.50 | 3.48 | 2.39 | 452,009 |   |  			
            | 6/20/2018 | -0.10 / -2.78% | 3.60 | 3.80 | 3.40 | 3.50 | 3.56 | 2.39 | 329,100 |   |  
            | 6/19/2018 | 0.00 / 0.00% | 3.50 | 3.60 | 3.30 | 3.60 | 3.50 | 2.46 | 721,700 |   |  			
            | 6/18/2018 | +0.10 / +2.86% | 3.60 | 3.60 | 3.50 | 3.60 | 3.59 | 2.46 | 157,800 |   |  
            | 6/15/2018 | 0.00 / 0.00% | 3.50 | 3.70 | 3.50 | 3.50 | 3.59 | 2.39 | 408,200 |   |  			
            | 6/14/2018 | 0.00 / 0.00% | 3.50 | 3.70 | 3.40 | 3.50 | 3.57 | 2.39 | 616,500 |   |  
            | 6/13/2018 | 0.00 / 0.00% | 3.50 | 3.80 | 3.50 | 3.50 | 3.56 | 2.39 | 636,600 |   |  			
            | 6/12/2018 | -0.10 / -2.78% | 3.60 | 3.60 | 3.40 | 3.50 | 3.50 | 2.39 | 727,500 |   |  
            | 6/11/2018 | -0.30 / -7.69% | 3.90 | 4.00 | 3.60 | 3.60 | 3.71 | 2.46 | 412,800 |   |  			
            | 6/8/2018 | 0.00 / 0.00% | 3.90 | 3.90 | 3.70 | 3.90 | 3.77 | 2.66 | 769,700 |   |  
            | 6/7/2018 | 0.00 / 0.00% | 4.20 | 4.20 | 3.90 | 3.90 | 4.03 | 2.66 | 1,212,700 |   |  			
            | 6/6/2018 | +0.30 / +8.33% | 3.60 | 3.90 | 3.60 | 3.90 | 3.81 | 2.66 | 815,700 |   |  
            | 6/5/2018 | +0.10 / +2.86% | 3.60 | 3.60 | 3.50 | 3.60 | 3.57 | 2.46 | 1,361,400 |   |  			
            | 6/4/2018 | +0.10 / +2.94% | 3.40 | 3.60 | 3.40 | 3.50 | 3.48 | 2.39 | 469,000 |   |  
            | 6/1/2018 | -0.20 / -5.56% | 3.60 | 3.60 | 3.40 | 3.40 | 3.48 | 2.32 | 358,100 |   |  			
            | 5/31/2018 | +0.30 / +9.09% | 3.30 | 3.60 | 3.30 | 3.60 | 3.42 | 2.46 | 714,900 |   |  
            | 5/30/2018 | -0.10 / -2.94% | 3.40 | 3.40 | 3.20 | 3.30 | 3.32 | 2.25 | 229,200 |   |  |