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Schedule of Investments (Unaudited) - Treasury Bills and Money Market Fund - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 97.17% 96.25%
United States Treasury Obligations, Value $ 863,930,234 $ 399,870,102
Affiliated Investments, Value 978,309,593 891,104,755
Investments in Securities, Value 1,842,239,827 1,290,974,857
Investments in Securities, Cost $ 1,841,578,503 $ 1,290,438,251
Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity 51.60% 66.44%
Affiliated Investments, Value $ 978,309,593 $ 891,104,755
Affiliated Investments, at Cost $ 977,777,722 $ 890,598,570
U.S. Treasury Bills, 0.045% due June 10, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 4.22%  
United States Treasury Obligations, Value [1] $ 79,998,211  
United States Treasury Obligations, Principal Value [1] $ 80,000,000  
Investment Interest Rate [1] 0.045%  
Investment Maturity Date [1] Jun. 10, 2021  
U.S. Treasury Bills, 0.070% due August 5, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 12.87%  
United States Treasury Obligations, Value [1] $ 243,987,190  
United States Treasury Obligations, Principal Value [1] $ 244,000,000  
Investment Interest Rate [1] 0.07%  
Investment Maturity Date [1] Aug. 05, 2021  
U.S. Treasury Bills, 0.050% due August 12, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 6.33%  
United States Treasury Obligations, Value [1] $ 119,991,577  
United States Treasury Obligations, Principal Value [1] $ 120,000,000  
Investment Interest Rate [1] 0.05%  
Investment Maturity Date [1] Aug. 12, 2021  
U.S. Treasury Bills, 0.060% due September 9, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 10.55%  
United States Treasury Obligations, Value [1],[2] $ 199,982,112  
United States Treasury Obligations, Principal Value [1],[2] $ 200,000,000  
Investment Interest Rate [1],[2] 0.06%  
Investment Maturity Date [1],[2] Sep. 09, 2021  
Restricted for maintenance margin [2] $ 209,958,000  
U.S. Treasury Bills, 0.035% due October 7, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1],[2] 10.55%  
United States Treasury Obligations, Value [1],[2] $ 199,975,062  
United States Treasury Obligations, Principal Value [1],[2] $ 200,000,000  
Investment Interest Rate [1],[2] 0.035%  
Investment Maturity Date [1],[2] Oct. 07, 2021  
U.S. Treasury Bills, 0.135% due November 4, 2021 [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 1.05%  
United States Treasury Obligations, Value [1] $ 19,996,082  
United States Treasury Obligations, Principal Value [1] $ 20,000,000  
Investment Interest Rate [1] 0.135%  
Investment Maturity Date [1] Nov. 04, 2021  
United States Treasury Obligations [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [1] 45.57% 29.81%
United States Treasury Obligations, Value [1] $ 863,930,234 $ 399,870,102
Investments in Securities, Cost [1] $ 863,800,781 $ 399,839,681
Exchange-Traded Fund [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3] 9.54% 13.49%
Affiliated Investments, Value [3] $ 180,974,994 $ 180,949,308
Affiliated Investments, Shares [3] 1,712,400 1,712,400
Investments in Securities, Cost [3] $ 180,443,123 $ 180,443,123
Money Market Mutual Fund - Invesco Premier U.S. Government Money Portfolio - Institutional Class [Member] | Affiliated Investments [Member]    
Schedule of Investments [Line Items]    
Percentage of Shareholders' Equity [3] 42.06% [4] 52.95% [5]
Affiliated Investments, Value [3] $ 797,334,599 [4] $ 710,155,447 [5]
Affiliated Investments, Shares [3] 797,334,599 [4] 710,155,447 [5]
Investment Interest Rate [3] 0.03% [4] 0.03% [5]
Affiliated Investments, at Cost [3] $ 797,334,599 [4] $ 710,155,447 [5]
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 [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 $209,958,000 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 March 31, 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.