[8-K] United States Oil Fund, LP Reports Material Event

Rhea-AI Filing Summary

United States Oil Fund, LP filed a current report to share its monthly account statement for the month ended December 31, 2025. The statement, prepared under Commodity Exchange Act Rule 4.22, includes a Statement of Income (Loss) and a Statement of Changes in Net Asset Value.

This information is furnished as Exhibit 99.1 and is also available on the fund’s website at www.uscfinvestments.com. The report specifies that this information is furnished, not filed, so it is not automatically subject to certain Securities Exchange Act liabilities or incorporated into other securities law filings.

8-K Event Classification

2 items: 7.01, 9.01

2 items

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

Understanding 8-K Material Events →

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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 OIL FUND, LP

(Exact name of registrant as specified in its charter)

Delaware	001-32834	20-2830691
(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 Oil Fund, LP		USO		NYSE Arca, Inc.

Item 7.01. Regulation FD Disclosure.

On January 29, 2026, United States Oil Fund, LP (the “Registrant”) issued its monthly account statement for the month ended December 31, 2025, which is presented in the form of a Statement of Income (Loss) and a Statement of Changes in Net Asset Value, as required pursuant to Rule 4.22 under the Commodity Exchange Act. A copy of the monthly account statement is furnished as Exhibit 99.1 to this Current Report on Form 8-K and also can be found on the Registrant’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 OIL FUND, LP
	By:	United States Commodity Funds LLC, its general partner
Date: January 29, 2026	By:	/s/ Stuart P. Crumbaugh
	Name:	Stuart P. Crumbaugh
	Title:	Chief Financial Officer

FAQ

What did United States Oil Fund (USO) disclose in this 8-K?

United States Oil Fund (USO) furnished its monthly account statement for the month ended December 31, 2025. The statement provides a Statement of Income (Loss) and a Statement of Changes in Net Asset Value for investors to review.

What financial information is included in USO’s December 31, 2025 monthly statement?

The December 31, 2025 monthly statement for USO includes a Statement of Income (Loss) and a Statement of Changes in Net Asset Value. These reports summarize the fund’s performance and changes in investors’ capital during the month.

Where can investors find the USO monthly account statement for December 31, 2025?

Investors can access USO’s December 31, 2025 monthly account statement as Exhibit 99.1 to the 8-K. It is also available on the fund’s website at www.uscfinvestments.com for convenient online review.

Is the USO monthly statement in this 8-K considered filed with the SEC?

No. The 8-K specifies that the monthly account statement, including Exhibit 99.1, is furnished rather than filed. This means it is not automatically subject to Section 18 liability or incorporated into other securities law filings.

Why does USO issue a monthly account statement under Rule 4.22?

USO issues a monthly account statement to comply with Rule 4.22 under the Commodity Exchange Act. This rule requires pooled investment vehicles to provide investors with regular statements showing income (loss) and changes in net asset value.