| 
                 
                    Closing price on 5/9/2011
                 
             | 
            
                                
             | 
         
         
 
    
        
                      
                
                    | Open | 
                    10.70 | 
                 
                
                    | High | 
                    10.90 | 
                 
                
                    | Low | 
                    10.60 | 
                     
                
                    | Volume | 
                    7,160 | 
                                 
                
                    | Split-adjusted Price | 
                    4.69 | 
                 
             
            
            
                
             
         | 
        
            
            
             
                            
         | 
     
 
PXS Historical Quote 
        
            
                | 
                    Date
                 | 
                
                    Change
                 |                 
                
                    Open
                 |          
                
                    High
                 |            
                
                    Low
                 |                                                 
                
                    Close
                 | 
                
                    Average
                 | 
                
                    Adjusted Close
                 |                                                 
                
                    Volume
                 |     
                
                     
                 |                                       
                             
    
        			
            | 
                5/9/2011
             | 
            
                +0.10 / +0.93%
             |             
            
                10.70
             |           
            
                10.90
             |               
            
                10.60
             |                           
            
                10.80
             | 
            
                10.80
             |                     
            
                4.69
             |                                 
            
                7,160
             |            
            
                 
             |                                       
         
    
        
            | 
                5/6/2011
             | 
            
                +0.10 / +0.94%
             |             
            
                10.50
             |           
            
                10.80
             |               
            
                10.50
             |                           
            
                10.70
             | 
            
                10.70
             |                     
            
                4.65
             |                                 
            
                26,100
             |  
            
                 
             |                                                              
             
    
        			
            | 
                5/5/2011
             | 
            
                -0.40 / -3.64%
             |             
            
                11.00
             |           
            
                11.00
             |               
            
                10.60
             |                           
            
                10.60
             | 
            
                10.60
             |                     
            
                4.61
             |                                 
            
                51,410
             |            
            
                 
             |                                       
         
    
        
            | 
                5/4/2011
             | 
            
                -0.30 / -2.65%
             |             
            
                11.10
             |           
            
                11.30
             |               
            
                11.00
             |                           
            
                11.00
             | 
            
                11.00
             |                     
            
                4.78
             |                                 
            
                38,560
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/29/2011
             | 
            
                0.00 / 0.00%
             |             
            
                11.20
             |           
            
                11.50
             |               
            
                11.20
             |                           
            
                11.30
             | 
            
                11.30
             |                     
            
                4.91
             |                                 
            
                57,750
             |            
            
                 
             |                                       
         
    
        
            | 
                4/28/2011
             | 
            
                0.00 / 0.00%
             |             
            
                11.30
             |           
            
                11.40
             |               
            
                11.20
             |                           
            
                11.30
             | 
            
                11.30
             |                     
            
                4.91
             |                                 
            
                13,840
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/27/2011
             | 
            
                -0.10 / -0.88%
             |             
            
                11.50
             |           
            
                11.50
             |               
            
                11.30
             |                           
            
                11.30
             | 
            
                11.30
             |                     
            
                4.91
             |                                 
            
                5,010
             |            
            
                 
             |                                       
         
    
        
            | 
                4/26/2011
             | 
            
                -0.20 / -1.72%
             |             
            
                11.80
             |           
            
                11.80
             |               
            
                11.40
             |                           
            
                11.40
             | 
            
                11.40
             |                     
            
                4.95
             |                                 
            
                74,940
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/25/2011
             | 
            
                +0.40 / +3.57%
             |             
            
                11.20
             |           
            
                11.60
             |               
            
                11.20
             |                           
            
                11.60
             | 
            
                11.60
             |                     
            
                5.04
             |                                 
            
                31,110
             |            
            
                 
             |                                       
         
    
        
            | 
                4/22/2011
             | 
            
                -0.10 / -0.88%
             |             
            
                11.10
             |           
            
                11.20
             |               
            
                11.00
             |                           
            
                11.20
             | 
            
                11.20
             |                     
            
                4.87
             |                                 
            
                30,020
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/21/2011
             | 
            
                -0.20 / -1.74%
             |             
            
                11.50
             |           
            
                11.50
             |               
            
                11.30
             |                           
            
                11.30
             | 
            
                11.30
             |                     
            
                4.91
             |                                 
            
                49,780
             |            
            
                 
             |                                       
         
    
        
            | 
                4/20/2011
             | 
            
                +0.10 / +0.88%
             |             
            
                11.50
             |           
            
                11.50
             |               
            
                11.30
             |                           
            
                11.50
             | 
            
                11.50
             |                     
            
                5.00
             |                                 
            
                50,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/19/2011
             | 
            
                -0.30 / -2.56%
             |             
            
                11.50
             |           
            
                11.90
             |               
            
                11.40
             |                           
            
                11.40
             | 
            
                11.40
             |                     
            
                4.95
             |                                 
            
                81,020
             |            
            
                 
             |                                       
         
    
        
            | 
                4/18/2011
             | 
            
                -0.40 / -3.31%
             |             
            
                12.10
             |           
            
                12.10
             |               
            
                11.70
             |                           
            
                11.70
             | 
            
                11.70
             |                     
            
                5.09
             |                                 
            
                131,270
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/15/2011
             | 
            
                -0.30 / -2.42%
             |             
            
                12.20
             |           
            
                12.40
             |               
            
                12.10
             |                           
            
                12.10
             | 
            
                12.10
             |                     
            
                5.26
             |                                 
            
                80,860
             |            
            
                 
             |                                       
         
    
        
            | 
                4/14/2011
             | 
            
                +0.10 / +0.81%
             |             
            
                12.30
             |           
            
                12.40
             |               
            
                12.10
             |                           
            
                12.40
             | 
            
                12.40
             |                     
            
                5.39
             |                                 
            
                61,570
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/13/2011
             | 
            
                -0.20 / -1.60%
             |             
            
                12.20
             |           
            
                12.40
             |               
            
                12.20
             |                           
            
                12.30
             | 
            
                12.30
             |                     
            
                5.35
             |                                 
            
                74,770
             |            
            
                 
             |                                       
         
    
        
            | 
                4/8/2011
             | 
            
                -0.10 / -0.79%
             |             
            
                12.50
             |           
            
                12.50
             |               
            
                12.30
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                5.43
             |                                 
            
                73,970
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/7/2011
             | 
            
                -0.20 / -1.56%
             |             
            
                12.80
             |           
            
                12.80
             |               
            
                12.20
             |                           
            
                12.60
             | 
            
                12.60
             |                     
            
                5.48
             |                                 
            
                91,840
             |            
            
                 
             |                                       
         
    
        
            | 
                4/6/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.70
             |           
            
                12.80
             |               
            
                12.70
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.30
             |                                 
            
                72,670
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/5/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.80
             |           
            
                12.80
             |               
            
                12.60
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.30
             |                                 
            
                54,910
             |            
            
                 
             |                                       
         
    
        
            | 
                4/4/2011
             | 
            
                -0.10 / -0.78%
             |             
            
                12.60
             |           
            
                12.80
             |               
            
                12.60
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.30
             |                                 
            
                94,540
             |  
            
                 
             |                                                              
             
    
        			
            | 
                4/1/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.80
             |           
            
                12.90
             |               
            
                12.70
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                5.34
             |                                 
            
                49,240
             |            
            
                 
             |                                       
         
    
        
            | 
                3/31/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.90
             |           
            
                13.00
             |               
            
                12.80
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                5.34
             |                                 
            
                65,880
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/30/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.50
             |           
            
                12.90
             |               
            
                12.50
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                5.34
             |                                 
            
                108,960
             |            
            
                 
             |                                       
         
    
        
            | 
                3/29/2011
             | 
            
                +0.30 / +2.38%
             |             
            
                12.70
             |           
            
                12.90
             |               
            
                12.60
             |                           
            
                12.90
             | 
            
                12.90
             |                     
            
                5.34
             |                                 
            
                133,180
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/28/2011
             | 
            
                +0.10 / +0.80%
             |             
            
                13.00
             |           
            
                13.00
             |               
            
                12.50
             |                           
            
                12.60
             | 
            
                12.60
             |                     
            
                5.22
             |                                 
            
                204,490
             |            
            
                 
             |                                       
         
    
        
            | 
                3/25/2011
             | 
            
                0.00 / 0.00%
             |             
            
                12.50
             |           
            
                12.60
             |               
            
                12.50
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                5.18
             |                                 
            
                104,400
             |  
            
                 
             |                                                              
             
    
        			
            | 
                3/24/2011
             | 
            
                -0.30 / -2.34%
             |             
            
                12.90
             |           
            
                12.90
             |               
            
                12.40
             |                           
            
                12.50
             | 
            
                12.50
             |                     
            
                5.18
             |                                 
            
                177,160
             |            
            
                 
             |                                       
         
    
        
            | 
                3/23/2011
             | 
            
                -0.10 / -0.78%
             |             
            
                12.90
             |           
            
                12.90
             |               
            
                12.80
             |                           
            
                12.80
             | 
            
                12.80
             |                     
            
                5.30
             |                                 
            
                113,230
             |  
            
                 
             |                                                              
             
    
         
    
    
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