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                    Closing price on 6/11/2018
                 |  |  
    
        |           
                
                    | Open | 3.90 |  
                    | High | 4.00 |  
                    | Low | 3.60 |  
                    | Volume | 412,800 |  
                    | Split-adjusted Price | 2.46 |  
                
             | 
 |  MST Historical Quote 
            
                | Date | Change | Open | High | Low | Close | Average | Adjusted Close | Volume |  |  			
            | 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 |   |  
            | 5/29/2018 | +0.20 / +6.25% | 3.20 | 3.40 | 3.20 | 3.40 | 3.36 | 2.32 | 475,000 |   |  			
            | 5/28/2018 | +0.10 / +3.23% | 3.10 | 3.30 | 3.00 | 3.20 | 3.12 | 2.18 | 834,300 |   |  
            | 5/25/2018 | -0.30 / -8.82% | 3.30 | 3.40 | 3.10 | 3.10 | 3.26 | 2.11 | 771,500 |   |  			
            | 5/24/2018 | -0.20 / -5.56% | 3.60 | 3.60 | 3.30 | 3.40 | 3.44 | 2.32 | 312,900 |   |  
            | 5/23/2018 | +0.10 / +2.86% | 3.50 | 3.60 | 3.40 | 3.60 | 3.49 | 2.46 | 339,200 |   |  			
            | 5/22/2018 | -0.30 / -7.89% | 3.70 | 3.70 | 3.50 | 3.50 | 3.57 | 2.39 | 1,260,600 |   |  
            | 5/21/2018 | -0.10 / -2.56% | 3.80 | 3.90 | 3.70 | 3.80 | 3.78 | 2.59 | 151,400 |   |  			
            | 5/18/2018 | 0.00 / 0.00% | 3.90 | 3.90 | 3.70 | 3.90 | 3.79 | 2.66 | 598,700 |   |  
            | 5/17/2018 | -0.20 / -4.88% | 4.10 | 4.10 | 3.80 | 3.90 | 3.98 | 2.66 | 780,500 |   |  			
            | 5/16/2018 | -0.10 / -2.38% | 4.20 | 4.20 | 4.00 | 4.10 | 4.10 | 2.80 | 663,200 |   |  
            | 5/15/2018 | 0.00 / 0.00% | 4.10 | 4.20 | 4.00 | 4.20 | 4.16 | 2.87 | 739,300 |   |  			
            | 5/14/2018 | +0.20 / +5.00% | 4.00 | 4.20 | 4.00 | 4.20 | 4.12 | 2.87 | 561,700 |   |  
            | 5/11/2018 | +0.30 / +8.11% | 3.70 | 4.00 | 3.60 | 4.00 | 3.88 | 2.73 | 674,700 |   |  			
            | 5/10/2018 | -0.30 / -7.50% | 4.30 | 4.40 | 3.70 | 3.70 | 4.10 | 2.52 | 1,472,300 |   |  
            | 5/9/2018 | +0.30 / +8.11% | 3.70 | 4.00 | 3.70 | 4.00 | 3.96 | 2.73 | 1,090,400 |   |  			
            | 5/8/2018 | +0.10 / +2.78% | 3.60 | 3.70 | 3.50 | 3.70 | 3.61 | 2.52 | 671,400 |   |  
            | 5/7/2018 | +0.10 / +2.86% | 3.40 | 3.60 | 3.30 | 3.60 | 3.50 | 2.46 | 945,080 |   |  			
            | 5/4/2018 | 0.00 / 0.00% | 3.50 | 3.60 | 3.30 | 3.50 | 3.46 | 2.39 | 634,400 |   |  
            | 5/3/2018 | +0.10 / +2.94% | 3.50 | 3.60 | 3.40 | 3.50 | 3.50 | 2.39 | 661,700 |   |  			
            | 5/2/2018 | +0.30 / +9.68% | 3.30 | 3.40 | 3.00 | 3.40 | 3.20 | 2.32 | 771,300 |   |  
            | 4/27/2018 | -0.10 / -3.13% | 3.30 | 3.30 | 3.10 | 3.10 | 3.20 | 2.11 | 309,000 |   |  |