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Schedules of Investments (Unaudited) (Tables)
9 Months Ended
Sep. 30, 2025
Notes Tables  
Investment [Table Text Block]
Security Description Face Amount   Fair Value 

U.S. Treasury bills(a)(b):

        

4.30% due 10/02/25

 $42,800,000  $42,795,219 

4.31% – 4.33% due 10/07/25

  86,500,000   86,441,364 

4.27% – 4.34% due 10/09/25

  34,000,000   33,969,313 

4.07% – 4.32% due 10/14/25

  43,000,000   42,937,275 

4.30% due 10/16/25

  5,500,000   5,490,710 

4.14% – 4.29% due 10/21/25

  43,300,000   43,202,719 

4.22% due 10/28/25

  140,500,000   140,073,800 

4.21% due 10/30/25

  50,000,000   49,836,706 

4.14% due 11/04/25

  2,500,000   2,490,522 

4.18% – 4.24% due 11/06/25

  95,400,000   95,016,255 

4.08% due 11/12/25

  63,000,000   62,705,905 

4.22% – 4.23% due 11/13/25

  87,100,000   86,682,045 

4.05% due 11/18/25

  34,300,000   34,117,524 

4.23% due 11/20/25

  40,000,000   39,779,444 

4.03% – 4.18% due 11/28/25

  47,400,000   47,094,571 

4.11% due 12/04/25

  48,000,000   47,667,381 

3.92% – 4.04% due 12/11/25

  65,000,000   64,506,451 

3.98% due 12/18/25

  22,500,000   22,311,493 

3.92% due 1/06/26

  25,000,000   24,741,839 

3.92% due 1/13/26

  16,500,000   16,317,754 

3.94% due 1/20/26

  11,200,000   11,068,083 

Total U.S. Treasury bills (Cost: $999,173,257)

      999,246,373 
         

Total Investments – 100.52%

      999,246,373 

Other Assets, Less Liabilities – (0.52)%

      (5,176,151)

Net Assets – 100.00%

     $994,070,222 
Security Description Face Amount   Fair Value 

U.S. Treasury bills(a)(b)

        

4.17% – 4.59% due 1/02/25

 $37,500,000  $37,500,000 

4.34% – 4.62% due 1/07/25

  98,000,000   97,944,299 

4.57% due 1/09/25

  43,000,000   42,964,807 

4.29% – 4.51% due 1/14/25

  89,000,000   88,875,569 

4.53% due 1/16/25

  56,000,000   55,907,757 

4.61% due 1/21/25

  30,000,000   29,932,776 

4.62% due 1/23/25

  30,000,000   29,925,716 

4.48% due 1/28/25

  36,000,000   35,890,863 

4.51% due 1/30/25

  50,000,000   49,835,497 

4.50% due 2/04/25

  55,000,000   54,788,541 

4.35% – 4.47% due 2/06/25

  42,500,000   42,325,521 

4.34% due 2/11/25

  75,000,000   74,651,357 

4.50% due 2/13/25

  82,000,000   81,594,453 

4.30% due 2/18/25

  5,000,000   4,972,655 

4.53% due 2/20/25

  64,000,000   63,636,179 

4.29% due 2/25/25

  9,500,000   9,440,139 

4.45% – 4.50% due 2/27/25

  25,000,000   24,835,859 

4.46% due 3/06/25

  28,750,000   28,539,454 

4.35% due 3/13/25

  50,000,000   49,593,634 

4.34% due 3/20/25

  61,000,000   60,455,082 

Total U.S. Treasury bills (Cost: $963,373,422)

      963,610,158 
         

Total Investments – 99.59%

      963,610,158 

Other Assets, Less Liabilities – 0.41%

      3,939,372 

Net Assets – 100.00%

     $967,549,530 
Schedule of Derivative Instruments [Table Text Block]
Number of Contracts Expiration Date Current Notional Amount  

Net Unrealized Appreciation

(Depreciation)

 
32,687 December 15, 2025 $991,815,104  $6,966,849 
Number of Contracts Expiration Date Current Notional Amount  

Net Unrealized Appreciation

(Depreciation)

 
32,662 March 17, 2025 $964,446,802  $32,609,106