v3.26.1
Statements of Cash Flows - USD ($)
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
United States Commodity Index Fund    
Cash Flows from Operating Activities:    
Net income (loss) $ 53,384,741 $ 21,683,348
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Change in unrealized (gain) loss on open commodity futures contracts (3,844,510) 4,901,568
(Increase) decrease in dividends receivable (3,863) (155,428)
(Increase) decrease in interest receivable 117,138 10,410
(Increase) decrease in prepaid insurance (28,394) (35,342)
Increase (decrease) in Management fees payable 41,255 28,774
Increase (decrease) in professional fees payable (176,431) (164,593)
Increase (decrease) in directors' fees payable (3,135) 3,744
Net cash provided by (used in) operating activities 49,486,801 26,272,481
Cash Flows from Financing Activities:    
Addition of shares 45,058,764 38,783,283
Redemption of shares (39,992,369) (10,239,714)
Net cash provided by (used in) financing activities 5,066,395 28,543,569
Net Increase (Decrease) in Cash and Cash Equivalents 54,553,196 54,816,050
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 281,154,690 185,888,476
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period 335,707,886 240,704,526
United States Copper Index Fund    
Cash Flows from Operating Activities:    
Net income (loss) 33,126,001 34,384,313
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Change in unrealized (gain) loss on open commodity futures contracts 53,734,867 (20,564,448)
(Increase) decrease in dividends receivable (550,096) (104,030)
(Increase) decrease in interest receivable 1,330 (16,991)
(Increase) decrease in prepaid insurance (57,307) (30,941)
(Increase) decrease in ETF transaction fees receivable (700) 0
Increase (decrease) in payable due to Broker (24,709,925) 0
Increase (decrease) in Management fees payable 206,739 17,269
Increase (decrease) in professional fees payable (311,793) (226,831)
Increase (decrease) in directors' fees payable 1,519 2,160
Net cash provided by (used in) operating activities 61,440,635 13,460,501
Cash Flows from Financing Activities:    
Addition of shares 587,184,579 78,155,881
Redemption of shares (338,776,880) (39,572,019)
Net cash provided by (used in) financing activities 248,407,699 38,583,862
Net Increase (Decrease) in Cash and Cash Equivalents 309,848,334 52,044,363
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 428,215,409 152,219,085
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period 738,063,743 204,263,448
United States Commodity Index Funds Trust    
Cash Flows from Operating Activities:    
Net income (loss) 86,510,742 56,067,661
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:    
Change in unrealized (gain) loss on open commodity futures contracts 49,890,357 (15,662,880)
(Increase) decrease in dividends receivable (553,959) (259,458)
(Increase) decrease in interest receivable 118,468 (6,581)
(Increase) decrease in prepaid insurance (85,701) (66,283)
(Increase) decrease in ETF transaction fees receivable (700) 0
Increase (decrease) in payable due to Broker (24,709,925) 0
Increase (decrease) in Management fees payable 247,994 46,043
Increase (decrease) in professional fees payable (488,224) (391,424)
Increase (decrease) in directors' fees payable (1,616) 5,904
Net cash provided by (used in) operating activities 110,927,436 39,732,982
Cash Flows from Financing Activities:    
Addition of shares 632,243,343 116,939,164
Redemption of shares (378,769,249) (49,811,733)
Net cash provided by (used in) financing activities 253,474,094 67,127,431
Net Increase (Decrease) in Cash and Cash Equivalents 364,401,530 106,860,413
Total Cash, Cash Equivalents and Equity in Trading Accounts, beginning of period 709,370,099 338,107,561
Total Cash, Cash Equivalents and Equity in Trading Accounts, end of period $ 1,073,771,629 $ 444,967,974