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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 98.63% 96.25%
United States Treasury Obligations, Value $ 1,041,943,669 $ 399,870,102
Affiliated Investments, Value 1,399,157,279 891,104,755
Investments in Securities, Value 2,441,100,948 1,290,974,857
Investments in Securities, Cost $ 2,440,604,371 $ 1,290,438,251
Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 56.53% 66.44%
Affiliated Investments, Value $ 1,399,157,279 $ 891,104,755
Affiliated Investments, at Cost $ 1,398,670,374 $ 890,598,570
U.S. Treasury Bills, 0.050% due October 7, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 8.08%  
United States Treasury Obligations, Value [1],[2] $ 199,999,112  
United States Treasury Obligations, Principal Value [1],[2] $ 200,000,000  
Investment Interest Rate [1],[2] 0.05%  
Investment Maturity Date [1],[2] Oct. 07, 2021  
U.S. Treasury Bills, 0.050% due November 4, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 0.81%  
United States Treasury Obligations, Value [1],[2] $ 19,998,946  
United States Treasury Obligations, Principal Value [1],[2] $ 20,000,000  
Investment Interest Rate [1],[2] 0.05%  
Investment Maturity Date [1],[2] Nov. 04, 2021  
U.S. Treasury Bills, 0.045% due December 2, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 4.04%  
United States Treasury Obligations, Value [1] $ 99,995,694  
United States Treasury Obligations, Principal Value [1] $ 100,000,000  
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] 4.04%  
United States Treasury Obligations, Value [1] $ 99,996,119  
United States Treasury Obligations, Principal Value [1] $ 100,000,000  
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 [1] 4.04%  
United States Treasury Obligations, Value [1] $ 99,992,509  
United States Treasury Obligations, Principal Value [1] $ 100,000,000  
Investment Interest Rate [1] 0.04%  
Investment Maturity Date [1] Jan. 06, 2022  
U.S. Treasury Bills, 0.050% due January 20, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 4.85%  
United States Treasury Obligations, Value [1] $ 119,988,222  
United States Treasury Obligations, Principal Value [1] $ 120,000,000  
Investment Interest Rate [1] 0.05%  
Investment Maturity Date [1] Jan. 20, 2022  
U.S. Treasury Bills, 0.050% due January 27, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 8.08%  
United States Treasury Obligations, Value [1],[2] $ 199,975,416  
United States Treasury Obligations, Principal Value [1],[2] $ 200,000,000  
Investment Interest Rate [1],[2] 0.05%  
Investment Maturity Date [1],[2] Jan. 27, 2022  
U.S. Treasury Bills, 0.055% due February 3, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 4.12%  
United States Treasury Obligations, Value [1],[2] $ 102,015,429  
United States Treasury Obligations, Principal Value [1],[2] $ 102,029,600  
Investment Interest Rate [1],[2] 0.055%  
Investment Maturity Date [1],[2] Feb. 03, 2022  
U.S. Treasury Bills, 0.050% due March 10, 2022 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 4.04%  
United States Treasury Obligations, Value [1] $ 99,982,222  
United States Treasury Obligations, Principal Value [1] $ 100,000,000  
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 [1] 42.10% 29.81%
United States Treasury Obligations, Value [1] $ 1,041,943,669 $ 399,870,102
Investments in Securities, Cost [1] $ 1,041,933,997 $ 399,839,681
Exchange Traded Funds | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3] 7.79% 13.49%
Affiliated Investments, Value [3] $ 192,924,594 $ 180,949,308
Affiliated Investments, Shares [3] 1,825,900 1,712,400
Investments in Securities, Cost [3] $ 192,437,689 $ 180,443,123
Money Market Mutual Fund [Member] | Invesco Government & Agency Portfolio, Institutional Class [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3] 48.74% [4] 52.95% [5]
Affiliated Investments, Value [3] $ 1,206,232,685 [4] $ 710,155,447 [5]
Affiliated Investments, Shares [3] 1,206,232,685 [4] 710,155,447 [5]
Investment Interest Rate [3] 0.03% [4] 0.03% [5]
Affiliated Investments, at Cost [3] $ 1,206,232,685 [4] $ 710,155,447 [5]
US Treasury Bills, 0.170% Due September 10, 2020 [Member]    
Schedule of Investments [Line Items]    
Restricted for maintenance margin [1],[2] $ 309,953,000  
U.S. Treasury Bills, 0.140% due September 9, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   5.96%
United States Treasury Obligations, Value [1]   $ 79,957,840
United States Treasury Obligations, Principal Value [1]   $ 80,000,000
Investment Interest Rate [1]   0.14%
Investment Maturity Date [1]   Sep. 09, 2021
U.S. Treasury Bills, 0.090% due June 10, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   5.96%
United States Treasury Obligations, Value [1]   $ 79,974,618
United States Treasury Obligations, Principal Value [1]   $ 80,000,000
Investment Interest Rate [1]   0.09%
Investment Maturity Date [1]   Jun. 10, 2021
U.S. Treasury Bills, 0.140% due October 7, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1]   5.96%
United States Treasury Obligations, Value [1]   $ 79,950,934
United States Treasury Obligations, Principal Value [1]   $ 80,000,000
Investment Interest Rate [1]   0.14%
Investment Maturity Date [1]   Oct. 07, 2021
U.S. Treasury Bills, 0.085% due February 25, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[6]   11.93%
United States Treasury Obligations, Value [1],[6]   $ 159,986,710
United States Treasury Obligations, Principal Value [1],[6]   $ 160,000,000
Investment Interest Rate [1],[6]   0.085%
Investment Maturity Date [1],[6]   Feb. 25, 2021
Restricted for maintenance margin [1],[6]   $ 149,985,000
[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 $309,953,000 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.
[3] 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.
[4] The rate shown is the 7-day SEC standardized yield as of September 30, 2021.
[5] The rate shown is the 7-day SEC standardized yield as of December 31, 2020.
[6] United States Treasury Obligations of $149,985,000 are on deposit with the Commodity Broker and held as maintenance margin for open futures contracts.