US Oil Fund holder nets 26,615-share buy

A ten percent owner of USO reported same-day open-market buys and sells, with an overall net share purchase and no Rule 10b5-1 plan indicated.

Rhea-AI Filing Summary

United States Oil Fund, LP (USO) reported that HRT FINANCIAL LP, a ten percent owner, executed multiple open-market transactions in its common stock on September 16, 2026. HRT purchased 43,638 shares at prices from $154.57 to $155.65 per share and sold 17,023 shares at prices from $156.32 to $161.84 per share, resulting in a net purchase of 26,615 shares. No Rule 10b5-1 trading plan is reported, and the filing states the reported positions are resulting from short sales.

Insider Trade Summary

Net Buyer: 26,615 shares

Net Buy 7 txns

Insider HRT FINANCIAL LP

Role 10% Owner

Bought 43,638 shs ($6.78M)

Sold 17,023 shs ($2.68M)

Type	Security	Shares	Price	Value
Purchase	Common Stock F1, F2	14,291	$154.57	$2.21M
Purchase	Common Stock F1, F2	29,347	$155.65	$4.57M
Sale	Common Stock F1, F2	1,088	$156.32	$170K
Sale	Common Stock F1, F2	14,625	$157.47	$2.30M
Sale	Common Stock F1, F2	1,222	$159.80	$195K
Sale	Common Stock F1, F2	87	$160.55	$14K
Sale	Common Stock F1, F2	1	$161.84	$161.84

Holdings After Transaction: Common Stock — 128,543 shares (Direct)

Footnotes (2)

1. F1. We will provide, upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.
2. F2. Resulting from short sales.

Key Figures

Shares purchased: 43,638 shares Shares sold: 17,023 shares Net share change: 26,615 shares +3 more

6 metrics

Shares purchased 43,638 shares Non-derivative purchases of USO common stock on September 16, 2026

Shares sold 17,023 shares Non-derivative sales of USO common stock on September 16, 2026

Net share change 26,615 shares Net buy (purchases minus sales) reported for September 16, 2026

Purchase price range $154.57–$155.65 per share Prices for reported USO share purchases on September 16, 2026

Sale price range $156.32–$161.84 per share Prices for reported USO share sales on September 16, 2026

Ten percent owner status Yes HRT FINANCIAL LP is listed as a ten percent owner of USO

Key Terms

ten percent owner, short sales, open market or private transaction, Rule 10b5-1

4 terms

ten percent owner regulatory

"HRT FINANCIAL LP is identified as a ten percent owner"

short sales financial

"A footnote states the reported positions are resulting from short sales"

Short sales are trades where an investor borrows shares and sells them immediately, aiming to buy them back later at a lower price and return them to the lender; the profit is the difference if the price falls. This matters to investors because short selling can signal negative expectations about a company, add downward pressure on a stock’s price, and carries unlimited loss risk if the stock rises instead of falls—like betting a borrowed item will be cheaper to replace later.

open market or private transaction financial

"Each transaction is described as a purchase or sale in open market or private transaction"

Rule 10b5-1 regulatory

"The filing’s Rule 10b5-1 checkbox is not marked for these trades"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider activity did HRT FINANCIAL LP report for USO on September 16, 2026?

HRT FINANCIAL LP reported open-market transactions in United States Oil Fund, LP (USO) common stock on September 16, 2026, buying 43,638 shares and selling 17,023 shares, for a net purchase of 26,615 shares at prices between $154.57 and $161.84 per share.

How many USO shares did HRT FINANCIAL LP buy and sell in this Form 4?

HRT FINANCIAL LP bought 43,638 USO shares and sold 17,023 USO shares, according to the Form 4 filing. This produced a net increase of 26,615 shares in the reported position for the transactions on September 16, 2026.

What price range did HRT FINANCIAL LP trade USO shares at on September 16, 2026?

The reported USO trades occurred at prices between $154.57 and $161.84 per share. Purchases were reported around $154.57–$155.65 per share, while sales were reported around $156.32–$161.84 per share.

Was a Rule 10b5-1 trading plan used for HRT FINANCIAL LP’s USO trades?

No. The Form 4 indicates the Rule 10b5-1 checkbox is not marked, and there is no footnote stating that the United States Oil Fund, LP (USO) trades were made under a Rule 10b5-1 or other pre-arranged trading plan.

What does the Form 4 say about short sales related to HRT FINANCIAL LP’s USO position?

A footnote in the Form 4 for United States Oil Fund, LP (USO) states that the reported positions are “resulting from short sales”. The filing also notes that full detail by price level will be provided upon request to the issuer, the SEC staff, or a security holder.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/17/2026 - 02:29 PM Accepted by SEC EDGAR 09/17/2026 - 02:28 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

X

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

HRT FINANCIAL LP

(Last) (First) (Middle)

3 WORLD TRADE CENTER, 175 GREENWICH STRE

76TH FLOOR

(Street)

NEW YORK NEW YORK 10007

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
United States Oil Fund, LP [ USO ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/10/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	09/16/2026		P		14,291	A	$154.57(1)	128,543(2)	D
Common Stock	09/16/2026		P		29,347	A	$155.65(1)	128,543(2)	D
Common Stock	09/16/2026		S		1,088	D	$156.32(1)	128,543(2)	D
Common Stock	09/16/2026		S		14,625	D	$157.47(1)	128,543(2)	D
Common Stock	09/16/2026		S		1,222	D	$159.8(1)	128,543(2)	D
Common Stock	09/16/2026		S		87	D	$160.55(1)	128,543(2)	D
Common Stock	09/16/2026		S		1	D	$161.84(1)	128,543(2)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. We will provide, upon request by the Commission staff, the issuer, or a security holder of the issuer, full information regarding the number of shares purchased or sold at each separate price.

2. Resulting from short sales.

	Adam Nunes	09/16/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)