United States Oil Fund, LP

Prospectus • Dec 30, 2025

424B3 1 i25468_uso-424b3.htm

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Filed pursuant to Rule 424(b)(3) File No. 333-272617

UNITED STATES OIL FUND, LP

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Supplement dated December 31, 2025

to

Prospectus dated April 25, 2025

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This supplement contains information that amends, supplements or modifies certain information contained in the prospectus of United States Oil Fund, LP dated April 25, 2025 (the “Prospectus”).

You should carefully read the Prospectus and this supplement before investing. This supplement should be read in conjunction with the Prospectus. You should also carefully consider the “Risk Factors” beginning on page 9 of the Prospectus before you decide to invest.

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Creation and Redemption Transaction Fee

As stated in the subsection of the Prospectus titled “Creation and Redemption of Shares— Creation and Redemption Transaction Fee ”, which appears on page 79 of the Prospectus, Authorized Participants are required to pay a transaction fee to United States Oil Fund, LP (“USO”) to compensate USO for expenses in connection with the creation and redemption of baskets. This fee may be reduced, increased, or otherwise changed by United States Commodity Funds, LLC (“USCF”). Effective January 1, 2026 the transaction fee amount paid by Authorized Participants to create or redeem one or more Creation Baskets or Redemption Baskets will be reduced from $1,000 per order to $350 per order.

In light of the foregoing, the Prospectus is revised as follows:

1. The first paragraph of the subsection entitled “Marketing Agent and Authorized Participants” on page 73 of the Prospectus is amended and restated as follows:

The offering of USO’s shares is a best efforts offering. USO continuously offers Creation Baskets consisting of 100,000 shares through the Marketing Agent, to Authorized Participants. All Authorized Participants pay a $350 fee for each order they place to create or redeem one or more Creation Baskets or Redemption Baskets. The fee of the Marketing Agent, which is calculated daily and payable monthly and borne by USCF, is equal to 0.025% of USO’s total net assets. In no event may the aggregate compensation paid to the Marketing Agent and any affiliate of USCF for distribution-related services in connection with this offering exceed ten percent (10%) of the gross proceeds of this offering.

1. The subsection entitled “Creation and Redemption of Shares— Creation and Redemption Transaction Fee ” on page 79 of the Prospectus is amended and restated as follows:

“ Creation and Redemption Transaction Fee

To compensate USO for its expenses in connection with the creation and redemption of baskets, an Authorized Participant is required to pay a transaction fee to USO of $350 per order to create or redeem baskets, regardless of the number of baskets in such order. An order may include multiple baskets. The transaction fee may be reduced, increased or otherwise changed by USCF. USCF shall notify DTC of any change in the transaction fee and will not implement any increase in the fee for the redemption of baskets until thirty (30) days after the date of the notice.”

1. All references in the Prospectus to a transaction fee, a Creation Fee or a Redemption Fee of $1000 are hereby updated and replaced with references to a transaction fee, a Creation Fee or a Redemption Fee of $350.

Capitalized terms not defined herein shall have the meanings afforded to them in the Prospectus.

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