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Condensed Schedule of Investments
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 401,443,958 $ 37,520,567
Open Futures Contracts- Long | United States Contracts | NYMEX WTI Crude Oil Futures February 2021 contracts, expiring January 2021    
Notional Amount [1] $ 632,796,307  
Number of Contracts [1] 14,943  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [1] $ 92,238,053  
% of Partners' Capital [1] 2.54%  
Open Futures Contracts- Long | United States Contracts | NYMEX WTI Crude Oil Futures CL February 2020 contracts, expiring January 2020    
Notional Amount [2]   $ 1,133,488,110
Number of Contracts [2]   19,178
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts [2]   $ 37,520,567
% of Partners' Capital [2]   3.20%
Open Commodity Futures Contracts - Long | United States Contracts    
Notional Amount $ 3,223,668,812  
Number of Contracts 74,708  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 401,443,958  
% of Partners' Capital 11.07%  
Open Commodity Futures Contracts - Long | United States Contracts | NYMEX WTI Crude Oil Futures March 2021 contracts, expiring February 2021    
Notional Amount $ 645,421,542  
Number of Contracts 14,909  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 79,603,128  
% of Partners' Capital 2.19%  
Open Commodity Futures Contracts - Long | United States Contracts | NYMEX WTI Crude Oil Futures April 2021 contracts, expiring March 2021    
Notional Amount $ 465,961,140  
Number of Contracts 11,168  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 77,808,780  
% of Partners' Capital 2.15%  
Open Commodity Futures Contracts - Long | United States Contracts | NYMEX WTI Crude Oil Futures May 2021 contracts, expiring April 2021    
Notional Amount $ 504,602,270  
Number of Contracts 11,168  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 39,167,650  
% of Partners' Capital 1.08%  
Open Commodity Futures Contracts - Long | United States Contracts | NYMEX WTI Crude Oil Futures June 2021 contracts, expiring May 2021    
Notional Amount $ 475,568,503  
Number of Contracts 11,182  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 68,212,157  
% of Partners' Capital 1.88%  
Open Commodity Futures Contracts - Long | United States Contracts | NYMEX WTI Crude Oil Futures July 2021 contracts, expiring June 2021    
Notional Amount $ 172,979,880  
Number of Contracts 3,735  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 8,242,320  
% of Partners' Capital 0.23%  
Open Commodity Futures Contracts - Long | United States Contracts | NYMEX WTI Crude Oil Futures December 2021 contracts, expiring November 2021    
Notional Amount $ 326,339,170  
Number of Contracts 7,603  
Fair Value/ Unrealized Gain (Loss) on Open Commodity Contracts $ 36,171,870  
% of Partners' Capital 1.00%  
Cash Equivalents    
Market Value   $ 1,175,542,347
% of Partners' Capital   100.39%
Cash Equivalents | United States Money Market Funds    
Market Value $ 418,534,000  
% of Partners' Capital 11.55%  
Cash Equivalents | United States Money Market Funds | Fidelity Investments Money Market Funds - Government Portfolio    
Shares/Principal Amount $ 10,002,000 [3] $ 20,000,000
Market Value $ 10,002,000 [3] $ 20,000,000
% of Partners' Capital 0.28% [3] 1.71%
Cash Equivalents | United States Money Market Funds | RBC U.S. Government Money Market Fund - Institutional Share Class, 0.02%    
Shares/Principal Amount [3] $ 408,532,000  
Market Value [3] $ 408,532,000  
% of Partners' Capital [3] 11.27%  
Cash Equivalents | United States Treasury Obligations    
Market Value   $ 1,155,542,347
% of Partners' Capital   98.68%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 2.05%, 1/02/2020    
Shares/Principal Amount   $ 25,000,000
Market Value   $ 24,998,594
% of Partners' Capital   2.13%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 2.03%, 1/09/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,977,667
% of Partners' Capital   4.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 2.01%, 1/16/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,958,646
% of Partners' Capital   4.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 2.04%, 1/23/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,938,369
% of Partners' Capital   4.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 2.02%, 1/30/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,919,525
% of Partners' Capital   4.27%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.89%, 2/06/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,906,251
% of Partners' Capital   4.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.87%, 2/13/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,889,215
% of Partners' Capital   4.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.85%, 2/20/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,872,569
% of Partners' Capital   4.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.85%, 2/27/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,855,126
% of Partners' Capital   4.26%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.83%, 3/05/2020    
Shares/Principal Amount   $ 100,000,000
Market Value   $ 99,677,067
% of Partners' Capital   8.51%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.84%, 3/19/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,802,833
% of Partners' Capital   4.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.88%, 3/26/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,780,417
% of Partners' Capital   4.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.70%, 4/02/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,784,056
% of Partners' Capital   4.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.64%, 4/09/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,775,875
% of Partners' Capital   4.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.60%, 4/16/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,765,917
% of Partners' Capital   4.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.60%, 4/23/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,750,458
% of Partners' Capital   4.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.59%, 4/30/2020    
Shares/Principal Amount   $ 50,000,000
Market Value   $ 49,737,500
% of Partners' Capital   4.25%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.54%, 5/07/2020    
Shares/Principal Amount   $ 45,000,000
Market Value   $ 44,757,906
% of Partners' Capital   3.82%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.55%, 5/14/2020    
Shares/Principal Amount   $ 30,000,000
Market Value   $ 29,828,033
% of Partners' Capital   2.55%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.55%, 5/21/2020    
Shares/Principal Amount   $ 30,000,000
Market Value   $ 29,819,638
% of Partners' Capital   2.55%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.58%, 5/28/2020    
Shares/Principal Amount   $ 30,000,000
Market Value   $ 29,806,367
% of Partners' Capital   2.55%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.53%, 6/04/2020    
Shares/Principal Amount   $ 40,000,000
Market Value   $ 39,738,222
% of Partners' Capital   3.39%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.53%, 6/11/2020    
Shares/Principal Amount   $ 30,000,000
Market Value   $ 29,794,463
% of Partners' Capital   2.54%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.54%, 6/18/2020    
Shares/Principal Amount   $ 40,000,000
Market Value   $ 39,712,700
% of Partners' Capital   3.39%
Cash Equivalents | United States Treasury Obligations | U.S. Treasury Bills, 1.57%, 6/25/2020    
Shares/Principal Amount   $ 40,000,000
Market Value   $ 39,694,933
% of Partners' Capital   3.39%
[1] *    Collateral amounted to $723,771,439 on open commodity futures contracts.
[2] Collateral amounted to $723,771,439 on open commodity futures contracts.
[3] #    Reflects the 7-day yield at December 31, 2020.