United States Commodity Index Funds Trust (USCI) Form 424B3 — Jun 30, 2026

United States Copper Index Fund (CPER) filed a prospectus supplement dated June 30, 2026, amending four paragraphs across two sections of its April 24, 2026 prospectus with updated investment strategy language. The supplement clarifies CPER's ability to invest in Other Copper-Related Investments, including cash-settled options, forward contracts, cleared swap contracts, and over-the-counter transactions based on copper prices, alongside its primary holdings in Benchmark Component Copper Futures Contracts.

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