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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2012
Valuation of Securities Using Fair Value Hierarchy

The following table summarizes the valuation of US12OF’s securities at December 31, 2012 using the fair value hierarchy:

 

                                                                                   
At December 31, 2012   Total     Level I         Level II           Level III    
       

Short-Term Investments

  $ 92,755,785      $ 92,755,785       $   -       $   -   

Exchange-Traded Futures Contracts

       

United States Contracts

    1,556,910        1,556,910        -        -   

During the year ended December 31, 2012, there were no transfers between Level I and Level II.

The following table summarizes the valuation of US12OF’s securities at December 31, 2011 using the fair value hierarchy:

 

                                                                                   
At December 31, 2011   Total     Level I         Level II           Level III    
       

Short-Term Investments

  $ 120,576,360      $ 120,576,360       $   -       $   -   

Exchange-Traded Futures Contracts

       

United States Contracts

    4,002,120        4,002,120        -        -   

During the year ended December 31, 2011, there were no transfers between Level I and Level II.

Fair Value of Derivative Instruments

Fair Value of Derivative Instruments

 

Derivatives not Accounted

for as Hedging Instruments

  Statements of Financial
Condition Location
  Fair Value at
December 31, 2012
    Fair Value at
December 31, 2011
       

        

         

Futures - Commodity Contracts

  Assets   $ 1,556,910      $ 4,002,120       
Effect of Derivative Instruments on the Statements of Operations

The Effect of Derivative Instruments on the Statements of Operations

 

        For the year ended
December 31, 2012
    For the year ended
December 31, 2011
    For the year ended
December 31, 2010
 

Derivatives not

Accounted for as

Hedging

Instruments

  Location of
Gain or
(Loss) on
Derivatives
Recognized
in Income
  Realized
Gain or
(Loss) on
Derivatives
Recognized
in Income
    Change in
Unrealized
Gain or
(Loss) on
Derivatives
Recognized
in Income
    Realized
Gain or
(Loss) on
Derivatives
Recognized
in Income
    Change in
Unrealized
Gain or
(Loss) on
Derivatives
Recognized
in Income
    Realized
Gain or
(Loss) on
Derivatives
Recognized
in Income
    Change in
Unrealized
Gain or
(Loss) on
Derivatives
Recognized
in Income
 
             

Futures -
Commodity Contracts

 

Realized
gain
(loss) on
closed
positions

  $ (6,954,520     $ 16,224,040        $ 17,158,730     
             
 

Change in
unrealized
loss on
open
positions

    $ (2,445,210     $ (11,864,440     $ (4,935,530