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Financial Highlights
9 Months Ended
Sep. 30, 2012
Financial Highlights [Abstract]  
Financial Highlights
  (9) Financial Highlights

 

The following financial highlights show the Trust's financial performance for the three and nine-month periods ended September 30, 2012 and 2011. Total return is calculated as the change in a theoretical beneficial owner's investment over the entire period and is not annualized. Total return is calculated based on the aggregate return of the Trust taken as a whole.

 

    Class A     Class B     Class A     Class B  
    Three months ended     Three months ended     Nine months ended     Nine months ended  
    September 30,     September 30,     September 30,     September 30,  
    2012     2011     2012     2011     2012     2011     2012     2011  
Per share operating performance:                                                                
Net asset value of Trading units, beginning of period   $ 83.93     $ 92.14     $ 90.03     $ 96.87     $ 91.32     $ 100.64     $ 96.98     $ 104.75  
Total Trading income (loss):                                                                
Trading gain (loss)     (1.73 )     6.39       (1.87 )     6.73       (5.59 )     1.45       (5.98 )     2.28  
Investment income     0.10       0.29       0.11       0.30       0.32       0.51       0.34       0.56  
Expenses     (2.04 )     (2.53 )     (1.75 )     (2.16 )     (5.79 )     (6.31 )     (4.82 )     (5.85 )
Trading income (loss)     (3.67 )     4.15       (3.51 )     4.87       (11.06 )     (4.35 )     (10.46 )     (3.01 )
Net asset value of Trading units, end of period   $ 80.26     $ 96.29     $ 86.52     $ 101.74     $ 80.26     $ 96.29     $ 86.52     $ 101.74  
                                                                 
Total return:                                                                
Total return before incentive fees     (4.48 )%     4.61 %     (4.00 )%     5.13 %     (12.18 )%     (3.96 )%     (10.85 )%     (2.54 )%
Less incentive fee allocations     (0.10 )%     (0.10 )%     (0.10 )%     (0.10 )%     (0.07 )%     (0.36 )%     (0.07 )%     (0.34 )%
Total return     (4.58 )%     4.51 %     (4.10 )%     5.03 %     (12.25 )%     (4.32 )%     (10.92 )%     (2.88 )%
                                                                 
Ratios to average net assets:                                                                
Trading income (loss)     (1.98 )%     4.43 %     (2.00 )%     4.94 %     (6.51 )%     (5.39 )%     (6.48 )%     (3.13 )%
Expenses:                                                                
Expenses, less incentive fees     (2.58 )%     (2.58 )%     (2.06 )%     (2.04 )%     (6.86 )%     (7.07 )%     (5.34 )%     (5.59 )%
Incentive fees     (0.10 )%     (0.10 )%     (0.10 )%     (0.10 )%     (0.07 )%     (0.36 )%     (0.07 )%     (0.34 )%
Total expenses     (2.68 )%     (2.68 )%     (2.16 )%     (2.14 )%     (6.93 )%     (7.43 )%     (5.41 )%     (5.93 )%

 

The calculations above do not include activity within the Trust's Non-Trading Accounts.

 

The net income and expense ratios are computed based upon the weighted average net assets for the Trust for the three and nine-month periods ended September 30, 2012 and 2011, respectively. The amounts are not annualized.