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Condensed Schedule of Investments
Jun. 30, 2015
USD ($)
Number
Unrealized Gain (Loss) on Open Commodity Contracts $ (47,173,255)
Open Futures Contracts, Long [Member] | United States [Member] | NYMEX WTI Crude Oil Futures CL August 2015 contracts, expiring July 21, 2015 [Member]  
Number of Contracts | Number [1] 38,345
Unrealized Gain (Loss) on Open Commodity Contracts [1] $ (47,173,255)
% of Partners' Capital [1] (2.07%)
Cash Equivalent [Member]  
Market Value $ 1,831,601,309
% of Partners' Capital 80.32%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.03%, 7/02/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,999,958
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.06%, 7/09/2015 [Member]  
Principal Amount $ 100,000,000
Market Value $ 99,998,667
% of Partners' Capital 4.39%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.05%, 7/16/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,999,062
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.08%, 7/23/2015 [Member]  
Principal Amount $ 100,000,000
Market Value $ 99,995,417
% of Partners' Capital 4.39%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.06%, 7/30/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,997,785
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.06%, 8/06/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,997,250
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 8/13/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,994,177
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 8/20/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,993,229
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 8/27/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,992,281
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.08%, 9/03/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,990,000
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.10%, 9/10/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,990,632
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.12%, 9/17/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,987,542
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.11%, 9/24/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,980,521
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.10%, 10/01/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,981,792
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.08%, 10/08/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,983,500
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.09%, 10/15/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,981,229
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.09%, 10/22/2015 [Member]  
Principal Amount $ 75,000,000
Market Value $ 74,978,812
% of Partners' Capital 3.29%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.06%, 10/29/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,990,833
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 11/05/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,987,653
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.08%, 11/12/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,984,646
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.08%, 11/19/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,985,312
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.09%, 11/27/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,982,410
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.07%, 12/03/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,986,007
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | U.S. Treasury Bills, 0.08%, 12/10/2015 [Member]  
Principal Amount $ 50,000,000
Market Value $ 49,982,000
% of Partners' Capital 2.19%
Cash Equivalent [Member] | United States [Member] | US Treasury Securities [Member]  
Market Value $ 1,524,740,715
% of Partners' Capital 66.86%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member]  
Market Value $ 306,860,594
% of Partners' Capital 13.46%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Fidelity Institutional Government Portfolio, Class I [Member]  
Principal Amount $ 100,000,000
Market Value $ 100,000,000
% of Partners' Capital 4.39%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Goldman Sachs Financial Square Funds Government Fund Class FS [Member]  
Principal Amount $ 792,942
Market Value $ 792,941
% of Partners' Capital 0.03%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Morgan Stanley Institutional Liquidity Fund, Government Portfolio [Member]  
Principal Amount $ 131,057,695
Market Value $ 131,057,695
% of Partners' Capital 5.75%
Cash Equivalent [Member] | United States [Member] | Money Market Funds [Member] | Wells Fargo Advantage Government Money Market Fund Class I [Member]  
Principal Amount $ 75,009,958
Market Value $ 75,009,958
% of Partners' Capital 3.29%
[1] Collateral amounted to $271,314,431 on open future contracts.