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Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund - USD ($)
Sep. 30, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 100.17% 99.78%
United States Treasury Obligations, Value $ 182,993,964 $ 119,984,182
Affiliated Investments, Value 306,144,450 245,409,996
Investments in Securities, Value 489,138,414 365,394,178
Investments in Securities, Cost 489,147,926 365,396,641
Restricted for maintenance margin $ 26,997,300 $ 29,997,000
Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 62.69% 67.02%
Affiliated Investments, Value $ 306,144,450 $ 245,409,996
Affiliated Investments, at Cost $ 306,158,232 $ 245,419,058
U.S. Treasury Bills, 0.050% due October 7, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 4.51%  
United States Treasury Obligations, Value [1] $ 21,999,902  
United States Treasury Obligations, Principal Value [1] $ 22,000,000  
Investment Interest Rate [1] 0.05%  
Investment Maturity Date [1] Oct. 07, 2021  
U.S. Treasury Bills, 0.050% due November 4, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 5.12%  
United States Treasury Obligations, Value [1] $ 24,998,682  
United States Treasury Obligations, Principal Value [1] $ 25,000,000  
Investment Interest Rate [1] 0.05%  
Investment Maturity Date [1] Nov. 04, 2021  
U.S. Treasury Bills, 0.045% due December 2, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 5.53%  
United States Treasury Obligations, Value [1] $ 26,998,837  
United States Treasury Obligations, Principal Value [1] $ 27,000,000  
Investment Interest Rate [1] 0.045%  
Investment Maturity Date [1] Dec. 02, 2021  
U.S. Treasury Bills, 0.045% due December 9, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 3.48%  
United States Treasury Obligations, Value [1] $ 16,999,340  
United States Treasury Obligations, Principal Value [1] $ 17,000,000  
Investment Interest Rate [1] 0.045%  
Investment Maturity Date [1] Dec. 09, 2021  
U.S. Treasury Bills, 0.040% due January 6, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [2] 5.53%  
United States Treasury Obligations, Value [2] $ 26,997,978  
United States Treasury Obligations, Principal Value [2] $ 27,000,000  
Investment Interest Rate [2] 0.04%  
Investment Maturity Date [2] Jan. 06, 2022  
U.S. Treasury Bills, 0.050% due January 20, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 4.10%  
United States Treasury Obligations, Value [1] $ 19,998,037  
United States Treasury Obligations, Principal Value [1] $ 20,000,000  
Investment Interest Rate [1] 0.05%  
Investment Maturity Date [1] Jan. 20, 2022  
U.S. Treasury Bills, 0.055% due February 3, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 5.73%  
United States Treasury Obligations, Value [1] $ 28,004,210  
United States Treasury Obligations, Principal Value [1] $ 28,008,100  
Investment Interest Rate 0.055%  
Investment Maturity Date [1] Feb. 03, 2022  
U.S. Treasury Bills, 0.050% due March 10, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 3.48%  
United States Treasury Obligations, Value [1] $ 16,996,978  
United States Treasury Obligations, Principal Value [1] $ 17,000,000  
Investment Interest Rate [1] 0.05%  
Investment Maturity Date [1] Mar. 10, 2022  
United States Treasury Obligations [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 37.48% 32.76% [3]
United States Treasury Obligations, Value $ 182,993,964 $ 119,984,182 [3]
Investments in Securities, Cost $ 182,989,694 $ 119,977,583
Exchange-Traded Fund [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [4] 10.21% 13.62%
Affiliated Investments, Value [4] $ 49,871,520 $ 49,876,240
Affiliated Investments, Shares [4] 472,000 472,000
Affiliated Investments, at Cost [4] $ 49,885,302 $ 49,885,302
Money Market Mutual Fund - Invesco Government & Agency Portfolio, Institutional Class [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [4],[5] 52.48%  
Affiliated Investments, Value [4],[5] $ 256,272,930  
Affiliated Investments, Shares [4],[5] 256,272,930  
Investment Interest Rate [4],[5] 0.03%  
Investments in Securities, Cost [4],[5] $ 256,272,930  
US Treasury Bills, 0.085% Due February 11, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3]   27.30%
United States Treasury Obligations, Value [3]   $ 99,994,722
United States Treasury Obligations, Principal Value [3]   $ 100,000,000
Investment Interest Rate   0.085%
Investment Maturity Date   Feb. 11, 2021
U.S. Treasury Bills, 0.140% due September 9, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3]   5.46%
United States Treasury Obligations, Value [3]   $ 19,989,460
United States Treasury Obligations, Principal Value [3]   $ 20,000,000
Investment Interest Rate [6]   0.14%
Investment Maturity Date [6]   Sep. 09, 2021
Money Market Mutual Fund - Invesco Premier U.S. Government Money ETF - Institutional Class [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [4],[7]   53.40%
Affiliated Investments, Value [4],[7]   $ 195,533,756
Affiliated Investments, Shares [4],[7]   195,533,756
Investment Interest Rate [4],[7]   0.03%
Investments in Securities, Cost [4],[7]   $ 195,533,756
[1] Security may be traded on a discount basis. The interest rate shown represents the discount rate at the most recent auction date of the security prior to period end
[2] United States Treasury Obligations of $26,997,300 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.
[3] Security may be traded on a discount basis. The interest rate shown represents the discount rate at the most recent auction date of the security prior to period end.
[4] Affiliated issuer. The issuer and/or the Fund is a wholly-owned subsidiary of Invesco Ltd., or is affiliated by having an investment adviser that is under common control of Invesco Ltd. See Note 8.
[5] The rate shown is the 7-day SEC standardized yield as of September 30, 2021
[6] United States Treasury Obligations of $29,997,000 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.
[7] The rate shown is the 7-day SEC standardized yield as of December 31, 2020.