United States Commodity Index Funds Trust (CPER) posts December 2025 USCI and CPER statements

Rhea-AI Filing Summary

United States Commodity Index Funds Trust, the sponsor of United States Commodity Index Fund (USCI) and United States Copper Index Fund (CPER), furnished monthly account statements for the month ended December 31, 2025. These statements are presented as Statements of Income (Loss) and Statements of Changes in Net Asset Value.

The statements were provided to comply with Rule 4.22 under the Commodity Exchange Act and are available as Exhibit 99.1 and on the USCI and CPER website at www.uscfinvestments.com. The information is furnished under Regulation FD and is not deemed filed for liability purposes under the Securities Exchange Act.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): January 29, 2026

UNITED STATES COMMODITY INDEX FUNDS TRUST

(Exact name of registrant as specified in its charter)

Delaware	001-34833	27-1537655
(State or other jurisdiction	(Commission File Number)	(I.R.S. Employer
of incorporation)		Identification No.)

	1850 Mt. Diablo Boulevard, Suite 640
	Walnut Creek, California 94596
(510) 522-9600	(Address of principal executive offices) (Zip Code)
Registrant's telephone number, including area code

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

¨ Written communication pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered:
Shares of United States Commodity Index Fund		USCI		NYSE Arca, Inc.
Shares of United States Copper Index Fund		CPER		NYSE Arca, Inc.

Item 7.01. Regulation FD Disclosure.

On January 29, 2026, United States Commodity Index Funds Trust (the “Registrant”), and 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 December 31, 2025, which are presented in the form of Statements of Income (Loss) and Statements of Changes in Net Asset Value, as required pursuant to Rule 4.22 under the Commodity Exchange Act. A copy of the monthly account statements is furnished as Exhibit 99.1 to this Current Report on Form 8-K and also can be found on USCI’s and CPER’s website at www.uscfinvestments.com. The information furnished in this Current Report on Form 8-K, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, nor shall it be deemed incorporated by reference in any filing under the Securities Act of 1933, as amended, except as shall be expressly set forth by specific reference in any such filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit 99.1

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

		UNITED STATES COMMODITY INDEX FUNDS TRUST
		By:	United States Commodity Funds LLC, its sponsor
Date:	January 29, 2026	By:	/s/ Stuart P. Crumbaugh
		Name:	Stuart P. Crumbaugh
		Title:	Chief Financial Officer

FAQ

What did United States Commodity Index Funds Trust disclose in this CPER 8-K filing?

The Trust furnished monthly account statements for USCI and CPER for the month ended December 31, 2025. These statements include a Statement of Income (Loss) and a Statement of Changes in Net Asset Value, provided to comply with Rule 4.22 under the Commodity Exchange Act.

Which funds of United States Commodity Index Funds Trust are covered in this December 2025 update?

The update covers United States Commodity Index Fund (USCI) and United States Copper Index Fund (CPER), each a series of United States Commodity Index Funds Trust. Both funds issued monthly account statements for the month ended December 31, 2025 in the furnished exhibit.

Where can investors access the December 31, 2025 monthly statements for USCI and CPER?

Investors can access the December 31, 2025 monthly account statements for USCI and CPER in Exhibit 99.1 to the current report and on the funds’ website at www.uscfinvestments.com, where the Statements of Income (Loss) and Changes in Net Asset Value are made available.

Are the USCI and CPER December 2025 statements considered filed with the SEC?

The monthly account statements for USCI and CPER are furnished, not filed, for purposes of Section 18 of the Securities Exchange Act of 1934. They are therefore not subject to Section 18 liabilities and are only incorporated by reference if specifically identified in another filing.

Why did United States Commodity Index Funds Trust issue monthly account statements for December 2025?

The Trust issued the monthly account statements for December 2025 to comply with Rule 4.22 under the Commodity Exchange Act. This rule requires commodity pools like USCI and CPER to provide investors with periodic Statements of Income (Loss) and Statements of Changes in Net Asset Value.

Who signed the 8-K furnishing the December 2025 USCI and CPER statements?

The report was signed on behalf of United States Commodity Index Funds Trust by United States Commodity Funds LLC, its sponsor. The signatory was Stuart P. Crumbaugh, serving as Chief Financial Officer, executing the filing dated January 29, 2026.