United States Commodity Index Funds Trust 8-K

What Happened

• On June 29, 2026, United States Commodity Index Funds Trust (the Registrant) announced that United States Commodity Index Fund (USCI) and United States Copper Index Fund (CPER), each a series of the Registrant, issued their monthly account statements for the month ended May 31, 2026. The statements are presented as Statements of Income (Loss) and Statements of Changes in Net Asset Value, furnished pursuant to Rule 4.22 under the Commodity Exchange Act. A copy of the statements is included as Exhibit 99.1 to the Form 8-K and is available at www.uscfinvestments.com. The filing notes the furnished information is not deemed “filed” for purposes of Section 18 of the Exchange Act and is not incorporated by reference into other filings unless expressly stated.

Key Details

• Filing date: June 29, 2026
• Reporting period: month ended May 31, 2026
• Funds covered: United States Commodity Index Fund (USCI) and United States Copper Index Fund (CPER)
• Documents furnished: Statements of Income (Loss) and Statements of Changes in Net Asset Value (Exhibit 99.1); available at www.uscfinvestments.com

Why It Matters

• These monthly statements give investors timely, month‑end information on income (loss) and changes in net asset value for USCI and CPER, useful for tracking short‑term performance and NAV movement. Because the materials are furnished under Regulation FD and Rule 4.22, they are public disclosures but are expressly not treated as “filed” for certain legal liabilities or automatically incorporated into other SEC filings. Investors who want the numeric details should review Exhibit 99.1 or the funds’ website.