10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

for the quarterly period ended June 30, 2011.

OR

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

for the transition period from              to             .

Commission File Number: 001-32834

United States Oil Fund, LP

(Exact name of registrant as specified in its charter)

Delaware	20-2830691
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

1320 Harbor Bay Parkway, Suite 145

Alameda, California 94502

(Address of principal executive offices) (Zip code)

(510) 522-9600

(Registrant’s telephone number, including area code)

N/A

(Former name, former address and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    x  Yes    ¨  No

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    x  Yes    ¨  No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨  (Do not check if a smaller reporting company)	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    ¨  Yes    x  No

UNITED STATES OIL FUND, LP

Table of Contents

	Page
Part I. FINANCIAL INFORMATION
Item 1. Condensed Financial Statements.		1
Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.		16
Item 3. Quantitative and Qualitative Disclosures About Market Risk.		34
Item 4. Controls and Procedures.		36
Part II. OTHER INFORMATION
Item 1. Legal Proceedings.		36
Item 1A. Risk Factors.		36
Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.		36
Item 3. Defaults Upon Senior Securities.		36
Item 4. Removed and Reserved.		36
Item 5. Other Information.		36
Item 6. Exhibits.		37

Part I. FINANCIAL INFORMATION

Item 1. Condensed Financial Statements.

Index to Condensed Financial Statements

Documents	Page
Condensed Statements of Financial Condition at June 30, 2011 (Unaudited) and December 31, 2010		2
Condensed Schedule of Investments (Unaudited) at June 30, 2011		3
Condensed Statements of Operations (Unaudited) for the three and six months ended June  30, 2011 and 2010		4
Condensed Statement of Changes in Partners’ Capital (Unaudited) for the six months ended June  30, 2011		5
Condensed Statements of Cash Flows (Unaudited) for the six months ended June 30, 2011 and 2010		6
Notes to Condensed Financial Statements for the period ended June 30, 2011 (Unaudited)		7

1

United States Oil Fund, LP

Condensed Statements of Financial Condition

At June 30, 2011 (Unaudited) and December 31, 2010

		000000000000000			000000000000000
	June 30, 2011			December 31, 2010
Assets
Cash and cash equivalents (Note 5)	$	1,252,621,841		$	1,522,955,092
Equity in UBS Securities LLC trading accounts:
Cash		326,906,415			254,503,610
Unrealized gain (loss) on open commodity futures contracts		(59,309,100	)		43,960,340
Dividend receivable		7,655			48,785
Other assets		579,130			573,506
Total assets	$	1,520,805,941		$	1,822,041,333
Liabilities and Partners’ Capital
Investment payable	$	1,137		$	—
Payable for units redeemed		78,003,657			31,174,128
General Partner management fees payable (Note 3)		506,405			698,317
Brokerage commissions payable		46,186			59,186
Other liabilities		1,131,216			1,502,130
Total liabilities		79,688,601			33,433,761
Commitments and Contingencies (Notes 3, 4 and 5)
Partners’ Capital
General Partner		—			—
Limited Partners		1,441,117,340			1,788,607,572
Total Partners’ Capital		1,441,117,340			1,788,607,572
Total liabilities and partners’ capital	$	1,520,805,941		$	1,822,041,333
Limited Partners’ units outstanding		38,500,000			45,900,000
Net asset value per unit	$	37.43		$	38.97
Market value per unit	$	37.24		$	39.00

See accompanying notes to condensed financial statements.

2

United States Oil Fund, LP

Condensed Schedule of Investments (Unaudited)

At June 30, 2011

		$(32,400,000)		$(32,400,000)			$(32,400,000)
	Number of Contracts		Loss on Open Commodity Contracts			% of Partners’ Capital
Open Futures Contracts - Long
Foreign Contracts
ICE WTI Crude Oil Futures August 2011 contracts, expiring July 2011		6,000	$	(32,400,000	)		(2.25	)
United States Contracts
NYMEX Crude Oil Futures CL August 2011 contracts, expiring July 2011		9,104		(26,909,100	)		(1.87	)
Total Open Futures Contracts		15,104	$	(59,309,100	)		(4.12	)
	Principal Amount		Market Value
Cash Equivalents
United States - Money Market Funds
Fidelity Institutional Government Portfolio - Class I	$	352,030,128	$	352,030,128			24.43
Goldman Sachs Financial Square Funds - Government Fund – Class CL		187,745,186		187,745,186			13.03
Morgan Stanley Institutional Liquidity Fund - Government Portfolio		550,885,825		550,885,825			38.22
Total Cash Equivalents			$	1,090,661,139			75.68

See accompanying notes to condensed financial statements.

3

United States Oil Fund, LP

Condensed Statements of Operations (Unaudited)

For the three and six months ended June 30, 2011 and 2010

	Three months ended June 30, 2011			Three months ended June 30, 2010			Six months ended June 30, 2011			Six months ended June 30, 2010
Income
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$	(16,027,940	)	$	(256,875,160	)	$	189,259,000		$	(25,799,460	)
Change in unrealized loss on open positions		(137,071,110	)		(28,193,580	)		(103,269,440	)		(181,464,830	)
Dividend income		32,303			188,946			148,356			282,769
Interest income		11,054			18,223			20,788			31,094
Other income		76,000			56,000			150,000			108,000
Total income (loss)		(152,979,693	)		(284,805,571	)		86,308,704			(206,842,427	)
Expenses
General Partner management fees (Note 3)		1,784,880			2,201,081			3,918,441			4,463,235
Brokerage commissions		361,481			550,220			843,195			1,018,256
Professional fees		328,067			369,351			652,132			974,256
Other expenses		164,933			398,261			365,271			589,944
Total expenses		2,639,361			3,518,913			5,779,039			7,045,691
Net income (loss)	$	(155,619,054	)	$	(288,324,484	)	$	80,529,665		$	(213,888,118	)
Net loss per limited partnership unit	$	(5.21	)	$	(6.45	)	$	(1.54	)	$	(5.02	)
Net income (loss) per weighted average limited partnership unit	$	(3.99	)	$	(5.34	)	$	1.82		$	(3.99	)
Weighted average limited partnership units outstanding		39,032,967			53,975,824			44,175,138			53,566,851

See accompanying notes to condensed financial statements.

4

United States Oil Fund, LP

Condensed Statement of Changes in Partners’ Capital (Unaudited)

For the six months ended June 30, 2011

		000000000000000		000000000000000			000000000000000
	General Partner		Limited Partners			Total
Balances, at December 31, 2010	$	—	$	1,788,607,572		$	1,788,607,572
Addition of 74,100,000 partnership units		—		2,906,157,486			2,906,157,486
Redemption of 81,500,000 partnership units		—		(3,334,177,383	)		(3,334,177,383	)
Net income		—		80,529,665			80,529,665
Balances, at June 30, 2011	$	—	$	1,441,117,340		$	1,441,117,340
Net Asset Value Per Unit:
At December 31, 2010	$	38.97
At June 30, 2011	$	37.43

See accompanying notes to condensed financial statements.

5

United States Oil Fund, LP

Condensed Statements of Cash Flows (Unaudited)

For the six months ended June 30, 2011 and 2010

	Six months ended June 30, 2011			Six months ended June 30, 2010
Cash Flows from Operating Activities:
Net income (loss)	$	80,529,665		$	(213,888,118	)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
(Increase) decrease in commodity futures trading account - cash		(72,402,805	)		4,842,916
Unrealized loss on futures contracts		103,269,440			181,464,830
Decrease in dividend receivable and other assets		35,506			4,039
Increase in investment payable		1,137			—
Decrease in General Partner management fees payable		(191,912	)		(81,216	)
Decrease in brokerage commissions payable		(13,000	)		(25,200	)
Decrease in other liabilities		(370,914	)		(621,189	)
Net cash provided by (used in) operating activities		110,857,117			(28,303,938	)
Cash Flows from Financing Activities:
Addition of partnership units		2,906,157,486			1,808,830,974
Redemption of partnership units		(3,287,347,854	)		(2,119,454,243	)
Net cash used in financing activities		(381,190,368	)		(310,623,269	)
Net Decrease in Cash and Cash Equivalents		(270,333,251	)		(338,927,207	)
Cash and Cash Equivalents, beginning of period		1,522,955,092			2,072,425,180
Cash and Cash Equivalents, end of period	$	1,252,621,841		$	1,733,497,973

See accompanying notes to condensed financial statements.

6

United States Oil Fund, LP

Notes to Condensed Financial Statements

For the period ended June 30, 2011 (Unaudited)

NOTE 1 - ORGANIZATION AND BUSINESS

The United States Oil Fund, LP (“USOF”) was organized as a limited partnership under the laws of the state of Delaware on May 12, 2005. USOF is a commodity pool that issues limited partnership units (“units”) that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). Prior to November 25, 2008, USOF’s units traded on the American Stock Exchange (the “AMEX”). USOF will continue in perpetuity, unless terminated sooner upon the occurrence of one or more events as described in its Fifth Amended and Restated Agreement of Limited Partnership dated as of October 13, 2008 (the “LP Agreement”). The investment objective of USOF is for the daily changes in percentage terms of its units’ net asset value to reflect the daily changes in percentage terms of the spot price of light, sweet crude oil delivered to Cushing, Oklahoma, as measured by the changes in the price of the futures contract for light, sweet crude oil traded on the New York Mercantile Exchange (the “NYMEX”) that is the near month contract to expire, except when the near month contract is within two weeks of expiration, in which case the futures contract will be the next month contract to expire, less USOF’s expenses. It is not the intent of USOF to be operated in a fashion such that the net asset value will equal, in dollar terms, the spot price of light, sweet crude oil or any particular futures contract based on light, sweet crude oil. United States Commodity Funds LLC (“USCF”) believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Oil Futures Contracts (as defined below) and Other Oil Interests (as defined below). USOF accomplishes its objective through investments in futures contracts for light, sweet crude oil and other types of crude oil, heating oil, gasoline, natural gas and other petroleum-based fuels that are traded on the NYMEX, ICE Futures or other U.S. and foreign exchanges (collectively, “Oil Futures Contracts”) and other oil-related investments such as cash-settled options on Oil Futures Contracts, forward contracts for oil, cleared swap contracts and over-the-counter transactions that are based on the price of crude oil, heating oil, gasoline, natural gas and other petroleum-based fuels, Oil Futures Contracts and indices based on the foregoing (collectively, “Other Oil Interests”). As of June 30, 2011, USOF held 9,104 Oil Futures Contracts for light, sweet crude oil traded on the NYMEX and 6,000 Oil Futures Contracts for light, sweet crude oil traded on the ICE Futures.

USOF commenced investment operations on April 10, 2006 and has a fiscal year ending on December 31. USCF is responsible for the management of USOF. USCF is a member of the National Futures Association (the “NFA”) and became a commodity pool operator registered with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005. USCF is also the general partner of the United States Natural Gas Fund, LP (“USNG”), the United States 12 Month Oil Fund, LP (“US12OF”), the United States Gasoline Fund, LP (“UGA”) and the United States Heating Oil Fund, LP (“USHO”), which listed their limited partnership units on the AMEX under the ticker symbols “UNG” on April 18, 2007, “USL” on December 6, 2007, “UGA” on February 26, 2008 and “UHN” on April 9, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USNG’s, US12OF’s, UGA’s and USHO’s units commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States Short Oil Fund, LP (“USSO”), the United States 12 Month Natural Gas Fund, LP (“US12NG”) and the United States Brent Oil Fund, LP (“USBO”), which listed their limited partnership units on the NYSE Arca under the ticker symbols “DNO” on September 24, 2009, “UNL” on November 18, 2009 and “BNO” on June 2, 2010, respectively. USCF is also the sponsor of the United States Commodity Index Fund (“USCI”), a series of the United States Commodity Index Funds Trust (the “Trust”), which listed its units on the NYSE Arca under the ticker symbol “USCI” on August 10, 2010. USCF has also filed a registration statement to register units of the United States Metals Index Fund, the United States Agriculture Index Fund and the United States Copper Index Fund, three additional series of the Trust.

USOF issues units to certain authorized purchasers (“Authorized Purchasers”) by offering baskets consisting of 100,000 units (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). The purchase price for a Creation Basket is based upon the net asset value of a unit calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received.

In addition, Authorized Purchasers pay USOF a $1,000 fee for each order placed to create one or more Creation Baskets or to redeem one or more baskets consisting of 100,000 units (“Redemption Baskets”). Units may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Units purchased or sold on a nationally recognized securities exchange are not purchased or sold at the net asset value of USOF but rather at market prices quoted on such exchange.

7

In April 2006, USOF initially registered 17,000,000 units on Form S-1 with the U.S. Securities and Exchange Commission (the “SEC”). On April 10, 2006, USOF listed its units on the AMEX under the ticker symbol “USO”. On that day, USOF established its initial net asset value by setting the price at $67.39 per unit and issued 200,000 units in exchange for $13,479,000. USOF also commenced investment operations on April 10, 2006, by purchasing Oil Futures Contracts traded on the NYMEX based on light, sweet crude oil. As of June 30, 2011, USOF had registered a total of 1,627,000,000 units.

The accompanying unaudited condensed financial statements have been prepared in accordance with Rule 10-01 of Regulation S-X promulgated by the SEC and, therefore, do not include all information and footnote disclosure required under accounting principles generally accepted in the United States of America (“GAAP”). The financial information included herein is unaudited; however, such financial information reflects all adjustments, which are, in the opinion of USCF, necessary for the fair presentation of the condensed financial statements for the interim period.

NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Revenue Recognition

Commodity futures contracts, forward contracts, physical commodities, and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the condensed statement of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the condensed financial statements. Changes in the unrealized gains or losses between periods are reflected in the condensed statement of operations. USOF earns interest on its assets denominated in U.S. dollars on deposit with the futures commission merchant at the overnight Federal Funds Rate less 32 basis points. In addition, USOF earns income on funds held at the custodian at prevailing market rates earned on such investments.

Brokerage Commissions

Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.

Income Taxes

USOF is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.

In accordance with GAAP, USOF is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. USOF files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. USOF is not subject to income tax return examinations by major taxing authorities for years before 2006 (year of inception). The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in USOF recording a tax liability that reduces net assets. However, USOF’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analyses of and changes to tax laws, regulations and interpretations thereof. USOF recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the period ended June 30, 2011.

8

Creations and Redemptions

Authorized Purchasers may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 100,000 units at a price equal to the net asset value of the units calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.

USOF receives or pays the proceeds from units sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Purchasers are reflected in USOF’s condensed statement of financial condition as receivable for units sold, and amounts payable to Authorized Purchasers upon redemption are reflected as payable for units redeemed.

Partnership Capital and Allocation of Partnership Income and Losses

Profit or loss shall be allocated among the partners of USOF in proportion to the number of units each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement.

Calculation of Net Asset Value

USOF’s net asset value is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing the amount by the total number of units issued and outstanding. USOF uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.

Net Income (Loss) per Unit

Net income (loss) per unit is the difference between the net asset value per unit at the beginning of each period and at the end of each period. The weighted average number of units outstanding was computed for purposes of disclosing net income (loss) per weighted average unit. The weighted average units are equal to the number of units outstanding at the end of the period, adjusted proportionately for units redeemed based on the amount of time the units were outstanding during such period. There were no units held by USCF at June 30, 2011.

Offering Costs

Offering costs incurred in connection with the registration of additional units after the initial registration of units are borne by USOF. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.

Cash Equivalents

Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of three months or less.

Reclassification

Certain amounts in the accompanying condensed financial statements were reclassified to conform with the current presentation.

Use of Estimates

The preparation of condensed financial statements in conformity with GAAP requires USOF’s management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

9

NOTE 3 - FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS

USCF Management Fee

Under the LP Agreement, USCF is responsible for investing the assets of USOF in accordance with the objectives and policies of USOF. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to USOF. For these services, USOF is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.45% per annum of average daily net assets.

Ongoing Registration Fees and Other Offering Expenses

USOF pays all costs and expenses associated with the ongoing registration of its units subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of units, and all legal, accounting, printing and other expenses associated with such offer and sale. For the six months ended June 30, 2011 and 2010, USOF incurred $23,530 and $42,850, respectively, in registration fees and other offering expenses.

Directors’ Fees and Expenses

USOF is responsible for paying its portion of the directors’ and officers’ liability insurance of all affiliated funds for which USCF serves as general partner or sponsor (all affiliated funds including USCI) and the fees and expenses of the independent directors who also serve as audit committee members of those affiliated USCF funds organized as limited partnerships (all affiliated funds, excluding USCI). Effective as of April 1, 2010, USOF became responsible for paying its portion of any payments that may become due to the independent directors pursuant to the deferred compensation agreements entered into between the independent directors, USCF and each of the affiliated funds, except USCI. USOF shares all director fees and expenses, including any that may become due pursuant to the deferred compensation agreements, with all the affiliated funds, except USCI, based on the relative assets of each fund, computed on a daily basis. These fees and expenses for the affiliated funds, except USCI, as described above, for the year ending December 31, 2011, are estimated to be a total of $540,000.

Licensing Fees

As discussed in Note 4 below, USOF entered into a licensing agreement with the NYMEX on May 30, 2007. Pursuant to the agreement, USOF and the affiliated funds managed by USCF, other than USBO and USCI, pay a licensing fee that is equal to 0.04% for the first $1,000,000,000 of combined assets of the funds and 0.02% for combined assets above $1,000,000,000. During the six months ended June 30, 2011 and 2010, USOF incurred $213,932 and $233,206, respectively, under this arrangement.

Investor Tax Reporting Cost

The fees and expenses associated with USOF’s audit expenses and tax accounting and reporting requirements are paid by USOF. These costs are estimated to be $1,000,000 for the year ending December 31, 2011.

Other Expenses and Fees

In addition to the fees described above, USOF pays all brokerage fees and other expenses in connection with the operation of USOF, excluding costs and expenses paid by USCF as outlined in Note 4 below.

NOTE 4 - CONTRACTS AND AGREEMENTS

USOF is party to a marketing agent agreement, dated as of March 13, 2006, as amended from time to time, with the Marketing Agent and USCF, whereby the Marketing Agent provides certain marketing services for USOF as outlined in the agreement. The fees of the Marketing Agent, which are borne by USCF, include a marketing fee of $425,000 per annum plus the following incentive fee: 0.00% on USOF’s assets from $0 - $500 million; 0.04% on USOF’s assets from $500 million - $4 billion; and 0.03% on USOF’s assets in excess of $4 billion.

10

The above fees do not include the following expenses, which are also borne by USCF: the cost of placing advertisements in various periodicals; web construction and development; or the printing and production of various marketing materials.

USOF is also party to a custodian agreement, dated March 13, 2006, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”) and USCF, whereby BBH&Co. holds investments on behalf of USOF. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, USOF is party to an administrative agency agreement, dated March 13, 2006, as amended from time to time, with USCF and BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for USOF. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time.

Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to USOF and each of the affiliated funds managed by USCF, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of (a) 0.06% for the first $500 million of USOF’s, USNG’s, US12OF’s, UGA’s, USHO’s, USSO’s, US12NG’s, USBO’s and USCI’s combined net assets, (b) 0.0465% for USOF’s, USNG’s, US12OF’s, UGA’s, USHO’s, USSO’s, US12NG’s, USBO’s and USCI’s combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once USOF’s, USNG’s, US12OF’s, UGA’s, USHO’s, USSO’s, US12NG’s, USBO’s and USCI’s combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays transaction fees ranging from $7 to $15 per transaction.

USOF has entered into a brokerage agreement with UBS Securities LLC (“UBS Securities”). The agreement requires UBS Securities to provide services to USOF in connection with the purchase and sale of Oil Futures Contracts and Other Oil Interests that may be purchased and sold by or through UBS Securities for USOF’s account. In accordance with the agreement, UBS Securities charges USOF commissions of approximately $7 to $15 per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts.

On May 30, 2007, USOF and the NYMEX entered into a licensing agreement whereby USOF was granted a non-exclusive license to use certain of the NYMEX’s settlement prices and service marks. Under the licensing agreement, USOF and the affiliated funds managed by USCF, other than USBO and USCI, pay the NYMEX an asset-based fee for the license, the terms of which are described in Note 3.

USOF expressly disclaims any association with the NYMEX or endorsement of USOF by the NYMEX and acknowledges that “NYMEX” and “New York Mercantile Exchange” are registered trademarks of the NYMEX.

NOTE 5 - FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES

USOF engages in the trading of futures contracts, options on futures contracts and cleared swaps (collectively, “derivatives”). USOF is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract.

USOF may enter into futures contracts, options on futures contracts and cleared swaps to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery.

The purchase and sale of futures contracts, options on futures contracts and cleared swaps require margin deposits with a futures commission merchant. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires a futures commission merchant to segregate all customer transactions and assets from the futures commission merchant’s proprietary activities.

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Futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure USOF has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract.

Through June 30, 2011, all of the futures contracts held by USOF were exchange-traded. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with over-the-counter transactions since, in over-the-counter transactions, a party must rely solely on the credit of its respective individual counterparties. However, in the future, if USOF were to enter into non-exchange traded contracts, it would be subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. USOF has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, USOF bears the risk of financial failure by the clearing broker.

USOF’s cash and other property, such as U.S. Treasuries, deposited with a futures commission merchant are considered commingled with all other customer funds, subject to the futures commission merchant’s segregation requirements. In the event of a futures commission merchant’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of a futures commission merchant could result in the complete loss of USOF’s assets posted with that futures commission merchant; however, the vast majority of USOF’s assets are held in U.S. Treasuries, cash and/or cash equivalents with USOF’s custodian and would not be impacted by the insolvency of a futures commission merchant. Also, the failure or insolvency of USOF’s custodian could result in a substantial loss of USOF’s assets.

USCF invests a portion of USOF’s cash in money market funds that seek to maintain a stable net asset value. USOF is exposed to any risk of loss associated with an investment in these money market funds. As of June 30, 2011 and December 31, 2010, USOF had deposits in domestic and foreign financial institutions, including cash investments in money market funds, in the amounts of $1,579,528,256 and $1,777,458,702, respectively. This amount is subject to loss should these institutions cease operations.

For derivatives, risks arise from changes in the market value of the contracts. Theoretically, USOF is exposed to market risk equal to the value of futures contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, USOF pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option.

USOF’s policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, USOF has a policy of requiring review of the credit standing of each broker or counterparty with which it conducts business.

The financial instruments held by USOF are reported in its condensed statement of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

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NOTE 6 - FINANCIAL HIGHLIGHTS

The following table presents per unit performance data and other supplemental financial data for the six months ended June 30, 2011 and 2010 for the unitholders. This information has been derived from information presented in the condensed financial statements.

	For the six months ended June 30, 2011 (Unaudited)			For the six months ended June 30, 2010 (Unaudited)
Per Unit Operating Performance:
Net asset value, beginning of period	$	38.97		$	39.16
Total loss		(1.41	)		(4.89	)
Total expenses		(0.13	)		(0.13	)
Net decrease in net asset value		(1.54	)		(5.02	)
Net asset value, end of period	$	37.43		$	34.14
Total Return		(3.95)	%		(12.82)	%
Ratios to Average Net Assets
Total income (loss)		4.92	%		(10.34)	%
Expenses excluding management fees*		0.21	%		0.26	%
Management fees*		0.45	%		0.45	%
Net income (loss)		4.59	%		(10.69)	%
*  Annualized

Total returns are calculated based on the change in value during the period. An individual unitholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from USOF.

NOTE 7 - FAIR VALUE OF FINANCIAL INSTRUMENTS

USOF values its investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of USOF (observable inputs) and (2) USOF’s own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows:

Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs).

Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available.

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In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety.

The following table summarizes the valuation of USOF’s securities at December 31, 2010 using the fair value hierarchy:

		$1,490,470,515		$1,490,470,515		$1,490,470,515		$1,490,470,515
	Total		Level I		Level II		Level III
At December 31, 2010
Short-Term Investments	$	1,490,470,515	$	1,490,470,515	$	—	$	—
Exchange-Traded Futures Contracts
Foreign Contracts		22,150,000		22,150,000		—		—
United States Contracts		21,810,340		21,810,340		—		—

During the year ended December 31, 2010, there were no significant transfers between Level I and Level II.

The following table summarizes the valuation of USOF’s securities at June 30, 2011 using the fair value hierarchy:

		$1,090,661,139			$1,090,661,139			$1,090,661,139		$1,090,661,139
	Total			Level I			Level II		Level III
At June 30, 2011
Short-Term Investments	$	1,090,661,139		$	1,090,661,139		$	—	$	—
Exchange-Traded Futures Contracts
Foreign Contracts		(32,400,000	)		(32,400,000	)		—		—
United States Contracts		(26,909,100	)		(26,909,100	)		—		—

During the six months ended June 30, 2011, there were no significant transfers between Level I and Level II.

Effective January 1, 2009, USOF adopted the provisions of Accounting Standards Codification 815 - Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives.

Fair Value of Derivative Instruments

	December 31, 2010		December 31, 2010		December 31, 2010
Derivatives not Accounted for as Hedging Instruments	Condensed Statement of Financial Condition Location	Fair Value At June 30, 2011		Fair Value At December 31, 2010
Futures - Commodity Contracts	Assets	$	(59,309,100)	$	43,960,340

The Effect of Derivative Instruments on the Condensed Statements of Operations

		For the six months ended June 30, 2011					For the six months ended June 30, 2010
Derivatives not Accounted for as Hedging Instruments	Location of Gain or (Loss) on Derivatives Recognized in Income	Realized Gain or (Loss) on Derivatives Recognized in Income		Change in Unrealized Gain or (Loss) Recognized in Income			Realized Gain or (Loss) on Derivatives Recognized in Income			Change in Unrealized Gain or (Loss) Recognized in Income
Futures - Commodity Contracts	Realized gain (loss) on closed positions	$	189,259,000				$	(25,799,460	)
	Change in unrealized loss on open positions			$	(103,269,440	)				$	(181,464,830	)

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NOTE 8 - RECENT ACCOUNTING PRONOUNCEMENTS

In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-04, “Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS.” ASU No. 2011-04 clarifies existing requirements for measuring fair value and for disclosure about fair value measurements in converged guidance of the FASB and the International Accounting Standards Board. The amendments are to be applied prospectively. For public entities, the amendments are effective during interim and annual periods beginning after December 15, 2011. For nonpublic entities, the amendments are effective for annual periods beginning after December 15, 2011. Early application by public entities is not permitted. Nonpublic entities may apply the amendments early, but no earlier than for interim periods beginning after December 15, 2011. The implementation of ASU No. 2011-04 is not expected to have a material impact on USOF’s financial statement disclosures.

In January 2010, FASB issued ASU No. 2010-06 “Improving Disclosures about Fair Value Measurements.” ASU No. 2010-06 clarifies existing disclosure and requires additional disclosures regarding fair value measurements. Effective for fiscal years beginning after December 15, 2010, and for interim periods within those fiscal years, entities will need to disclose information about purchases, sales, issuances and settlements of Level 3 securities on a gross basis, rather than as a net number as currently required. The implementation of ASU No. 2010-06 is not expected to have a material impact on USOF’s financial statement disclosures.

NOTE 9 - SUBSEQUENT EVENTS

USOF has performed an evaluation of subsequent events through the date the financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

The following discussion should be read in conjunction with the condensed financial statements and the notes thereto of the United States Oil Fund, LP (“USOF”) included elsewhere in this quarterly report on Form 10-Q.

Forward-Looking Information

This quarterly report on Form 10-Q, including this “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” contains forward-looking statements regarding the plans and objectives of management for future operations. This information may involve known and unknown risks, uncertainties and other factors that may cause USOF’s actual results, performance or achievements to be materially different from future results, performance or achievements expressed or implied by any forward-looking statements. Forward-looking statements, which involve assumptions and describe USOF’s future plans, strategies and expectations, are generally identifiable by use of the words “may,” “will,” “should,” “expect,” “anticipate,” “estimate,” “believe,” “intend” or “project,” the negative of these words, other variations on these words or comparable terminology. These forward-looking statements are based on assumptions that may be incorrect, and USOF cannot assure investors that the projections included in these forward-looking statements will come to pass. USOF’s actual results could differ materially from those expressed or implied by the forward-looking statements as a result of various factors.

USOF has based the forward-looking statements included in this quarterly report on Form 10-Q on information available to it on the date of this quarterly report on Form 10-Q, and USOF assumes no obligation to update any such forward-looking statements. Although USOF undertakes no obligation to revise or update any forward-looking statements, whether as a result of new information, future events or otherwise, investors are advised to consult any additional disclosures that USOF may make directly to them or through reports that USOF in the future files with the U.S. Securities and Exchange Commission (the “SEC”), including annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K.

Introduction

USOF, a Delaware limited partnership, is a commodity pool that issues units that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). The investment objective of USOF is for the daily changes in percentage terms of its units’ net asset value (“NAV”) to reflect the daily changes in percentage terms of the spot price of light, sweet crude oil delivered to Cushing, Oklahoma, as measured by the changes in the price of the futures contract for light, sweet crude oil traded on the New York Mercantile Exchange (the “NYMEX”) that is the near month contract to expire, except when the near month contract is within two weeks of expiration, in which case it will be measured by the futures contract that is the next month contract to expire, less USOF’s expenses. It is not the intent of USOF to be operated in a fashion such that the NAV will equal, in dollar terms, the spot price of light, sweet crude oil or any particular futures contract based on light, sweet crude oil. The general partner of USOF, United States Commodity Funds LLC (“USCF”) believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Oil Futures Contracts (as defined below) and Other Oil Interests (as defined below).

USOF invests in futures contracts for light, sweet crude oil, other types of crude oil, heating oil, gasoline, natural gas and other petroleum-based fuels that are traded on the NYMEX, ICE Futures or other U.S. and foreign exchanges (collectively, “Oil Futures Contracts”) and other oil interests such as cash-settled options on Oil Futures Contracts, forward contracts for oil, cleared swap contracts and over-the-counter transactions that are based on the price of crude oil, other petroleum-based fuels, Oil Futures Contracts and indices based on the foregoing (collectively, “Other Oil Interests”). For convenience and unless otherwise specified, Oil Futures Contracts and Other Oil Interests collectively are referred to as “Oil Interests” in this quarterly report on Form 10-Q.

USOF seeks to achieve its investment objective by investing in a combination of Oil Futures Contracts and Other Oil Interests such that changes in its NAV, measured in percentage terms, will closely track the changes in the price of the Benchmark Oil Futures Contract, also measured in percentage terms. USCF believes the daily changes in the price of the Benchmark Oil Futures Contract have historically exhibited a close correlation with the daily changes in the spot price of light, sweet crude oil. It is not the intent of USOF to be operated in a fashion such that the NAV will equal, in dollar terms, the spot price of light, sweet crude oil or any particular futures contract based on light, sweet crude oil. USCF believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Oil Futures Contracts and Other Oil Interests.

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On any valuation day, the Benchmark Oil Futures Contract is the near month futures contract for light, sweet crude oil traded on the NYMEX unless the near month contract is within two weeks of expiration, in which case the Benchmark Oil Futures Contract becomes, over a 4-day period, the next month contract for light, sweet crude oil traded on the NYMEX. “Near month contract” means the next contract traded on the NYMEX due to expire. “Next month contract” means the first contract traded on the NYMEX due to expire after the near month contract.

The regulation of commodity interests in the United States is subject to ongoing modification by governmental and judicial action. On July 21, 2010, a broad financial regulatory reform bill, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”), was signed into law.

All of the Dodd-Frank Act’s new provisions will have become effective by the date of this quarterly report on Form 10-Q. However, new rules implementing, and in many cases, interpreting and clarifying, the Dodd-Frank Act’s new requirements have not been finalized. Therefore, USOF will necessarily operate in a period of regulatory uncertainty until new regulations have been finalized. Some specific examples of how the new Dodd-Frank Act provisions and rules adopted thereunder could impact USOF are discussed below.

Provisions in the Dodd-Frank Act include the requirement that position limits be established on a wide range of commodity interests including energy-based and other commodity futures contracts, certain cleared commodity swaps and certain over-the-counter commodity contracts; new registration, recordkeeping, capital and margin requirements for “swap dealers” and “major swap participants” as determined by the new law and applicable regulations; and the forced use of clearinghouse mechanisms for most swap transactions that are currently entered into in the over-the-counter market. The new law and the rules thereunder may negatively impact USOF’s ability to meet its investment objective either through limits or requirements imposed on it or upon its counterparties. Further, increased regulation of, and the imposition of additional costs on, swap transactions under the new legislation and implementing regulations could cause a reduction in the swap market and the overall derivatives markets, which could restrict liquidity and adversely affect USOF. In particular, new position limits imposed on USOF or its counterparties may impact USOF’s ability to invest in a manner that most efficiently meets its investment objective, and new requirements, including capital and mandatory clearing, may increase the cost of USOF’s investments and doing business, which could adversely impact the ability of USOF to achieve its investment objective.

On January 13, 2011, the U.S. Commodity Futures Trading Commission (the “CFTC”) proposed new rules, which if implemented in their proposed form, would establish position limits and limit formulas for certain physical commodity futures, including Oil Futures Contracts and options on Oil Futures Contracts, executed pursuant to the rules of designated contract markets (i.e., certain regulated exchanges) and commodity swaps that are economically equivalent to such futures and options contracts. The CFTC has also proposed aggregate position limits that would apply across different trading venues to contracts based on the same underlying commodity. At this time, it is unknown precisely when such position limits would take effect. It is also unclear when the CFTC’s proposed rule regarding position limits for futures contracts held during the last few days of trading in the near month contract to expire, which, under such proposed rule are substantially similar to the position limits currently set by the exchanges, will take effect.

On April 12, 2011, the Office of the Comptroller of the Currency, the Board of Governors of the Federal Reserve System, the Federal Deposit Insurance Corporation, the Farm Credit System and the Federal Housing Finance Agency (collectively, the “Prudential Regulators”) and the CFTC issued proposed rules establishing minimum initial and variation margin collection requirements for certain swap dealers and major swap participants (collectively, “Covered Swap Entities”), which if adopted, would require Covered Swap Entities to collect minimum initial and variation margin amounts from swap counterparties. The public comment period for these rules was extended on June 23, 2011. The Prudential Regulators’ proposed rules would apply to those Covered Swap Entities that are regulated by the Prudential Regulators and the CFTC’s proposed rules would apply to Covered Swap Entities that are not regulated by the Prudential Regulators.

The amount of initial and variation margin that Covered Swap Entities would be required to collect under the proposed rules varies based on whether their counterparty to a particular swap is (1) a Covered Swap Entity, (2) a “high-risk” financial entity end-user, (3) a “low-risk” financial entity end-user (e.g., financial entities subject to capital requirements imposed by bank or insurance regulators,

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that predominantly use swaps to hedge and that do not have significant swap exposure) or (4) a non-financial end-user. With certain exceptions not applicable to USOF and the affiliated funds managed by USCF, Covered Swap Entities would not be required to post initial or variation margin to any of their counterparties except for other Covered Swap Entities.

Covered Swap Entities and all financial entity end-users would be required to post initial margin and variation margin when they enter into swaps with Covered Swap Entities. Margin posted by “low-risk” financial entity end-users could be subject to thresholds under the proposed rules. As commodity pools, USOF and the affiliated funds managed by USCF would be “high-risk” financial entity end-users and would therefore have to post margin without thresholds.

The CFTC and the SEC have proposed joint rules defining “swaps” and “security-based swaps,” which would provide additional clarity regarding which transactions will be regulated as such under the Dodd-Frank Act and, more specifically, whether and how new CFTC and SEC rules will apply to USOF. The CFTC has now issued proposed versions of all of the rules it is required to promulgate under the Dodd-Frank Act but, with one exception not applicable to USOF and the affiliated funds managed by USCF, the CFTC has not promulgated any final rules or indicated when such final rules would take effect. On July 14, 2011, the CFTC issued an order providing temporary relief from certain swaps-related provisions of Title VII that would have automatically taken effect on July 16, 2011. The final order granted temporary exemptive relief that, by its terms, expires upon the earlier of the effective date of the required final rulemaking or December 31, 2011. The effect of the future regulatory change on USOF is impossible to predict, but it could be substantial and adverse.

USCF, which is registered as a commodity pool operator (“CPO”) with the CFTC, is authorized by the Fifth Amended and Restated Agreement of Limited Partnership of USOF (the “LP Agreement”) to manage USOF. USCF is authorized by USOF in its sole judgment to employ and establish the terms of employment for, and termination of, commodity trading advisors or futures commission merchants.

Price Movements

Crude oil futures prices were volatile during the six months ended June 30, 2011 and exhibited moderate daily swings along with an uneven downward trend between January 2011 and February 2011, an upward trend from March 2011 to May 2011 and finishing the period with a downward trend. The price of the Benchmark Oil Futures Contract started the period at $91.38 per barrel. The low of the period was on January 27, 2011 when the price dropped to $85.64 per barrel. The high of the period was on April 29, 2011 when the price reached $113.93 per barrel. The period ended with the Benchmark Oil Futures Contract at $95.42 per barrel, up approximately 4.42% over the period. USOF’s NAV began the period at $38.97 per unit and ended the period at $37.43 per unit on June 30, 2011, a decrease of approximately 3.95% over the period. USOF’s NAV reached its high for the period on April 29, 2011 at $45.25 per unit and reached its low for the period on February 15, 2011 at $35.40 per unit. The Benchmark Oil Futures Contract prices listed above began with the February 2011 contract and ended with the August 2011 contract. The return of approximately 4.42% on the Benchmark Oil Futures Contract listed above is a hypothetical return only and could not actually be achieved by an investor holding Oil Futures Contracts. An investment in Oil Futures Contracts would need to be rolled forward during the time period described in order to achieve such a result. Furthermore, the change in the nominal price of these differing crude Oil Futures Contracts, measured from the start of the period to the end of the period, does not represent the actual benchmark results that USOF seeks to track, which are more fully described below in the section titled “Tracking USOF’s Benchmark.”

During the six months ended June 30, 2011, the level of contango remained mildly steep, meaning that the price of the near month crude Oil Futures Contract was less than the price of the next month crude Oil Futures Contract, or contracts further away from expiration. Crude oil inventories, which reached historic levels in January 2009 and February 2009 and which appeared to be the primary cause of the steep level of contango, began to drop in March 2009 and continued to drop for the remainder of 2009 and the beginning of 2010. During the year ended December 31, 2010 and the six months ended June 30, 2011, crude oil inventories began to climb higher, which contributed to the crude oil futures market remaining in contango through the end of June 2011. For a discussion of the impact of backwardation and contango on total returns, see “Term Structure of Crude Oil Prices and the Impact on Total Returns” below.

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Valuation of Oil Futures Contracts and the Computation of the NAV

The NAV of USOF’s units is calculated once each NYSE Arca trading day. The NAV for a particular trading day is released after 4:00 p.m. New York time. Trading during the core trading session on the NYSE Arca typically closes at 4:00 p.m. New York time. USOF’s administrator uses the NYMEX closing price (determined at the earlier of the close of the NYMEX or 2:30 p.m. New York time) for the contracts held on the NYMEX, but calculates or determines the value of all other USOF investments, including ICE Futures contracts or other futures contracts, as of the earlier of the close of the NYSE Arca or 4:00 p.m. New York time.

Results of Operations and the Crude Oil Market

Results of Operations. On April 10, 2006, USOF listed its units on the American Stock Exchange (the “AMEX”) under the ticker symbol “USO.” On that day, USOF established its initial offering price at $67.39 per unit and issued 200,000 units to the initial authorized purchaser, KV Execution Services LLC, in exchange for $13,479,000 in cash. As a result of the acquisition of the AMEX by NYSE Euronext, USOF’s units no longer trade on the AMEX and commenced trading on the NYSE Arca on November 25, 2008.

Since its initial offering of 17,000,000 units, USOF has registered seven subsequent offerings of its units: 30,000,000 units which were registered with the SEC on October 18, 2006, 50,000,000 units which were registered with the SEC on January 30, 2007, 30,000,000 units which were registered with the SEC on December 4, 2007, 100,000,000 units which were registered with the SEC on February 7, 2008, 100,000,000 units which were registered with the SEC on September 29, 2008, 300,000,000 units which were registered with the SEC on January 16, 2009 and 1,000,000,000 units which were registered with the SEC on June 29, 2009. Units offered by USOF in the subsequent offerings were sold by it for cash at the units’ NAV as described in the applicable prospectus. As of June 30, 2011, USOF had issued 634,900,000 units, 38,500,000 of which were outstanding. As of June 30, 2011, there were 992,100,000 units registered but not yet issued.

More units may have been issued by USOF than are outstanding due to the redemption of units. Unlike funds that are registered under the Investment Company Act of 1940, as amended, units that have been redeemed by USOF cannot be resold by USOF. As a result, USOF contemplates that additional offerings of its units will be registered with the SEC in the future in anticipation of additional issuances and redemptions.

For the Six Months Ended June 30, 2011 Compared to the Six Months Ended June 30, 2010

As of June 30, 2011, the total unrealized loss on Oil Futures Contracts owned or held on that day was $59,309,100, and USOF established cash deposits, including cash investments in money market funds, that were equal to $1,579,528,256. USOF held 79.30% of its cash assets in overnight deposits and money market funds at its custodian bank, while 20.70% of the cash balance was held as margin deposits for the Oil Futures Contracts purchased. The ending per unit NAV on June 30, 2011 was $37.43.

By comparison, as of June 30, 2010, the total unrealized gain on Oil Futures Contracts owned or held on that day was $2,813,220 and USOF established cash deposits, including cash investments in money market funds, that were equal to $2,051,325,608. USOF held 84.51% of its cash assets in overnight deposits and money market funds at its custodian bank, while 15.49% of the cash balance was held as margin deposits for the Oil Futures Contracts purchased. The decrease in cash assets in overnight deposits and money market funds for June 30, 2011, as compared to June 30, 2010, was the result of USOF’s greater size in the prior period as measured by total net assets. The ending per unit NAV on June 30, 2010 was $34.14. The increase in the per unit NAV for June 30, 2011, as compared to June 30, 2010, was primarily a result of an increase in the price of crude oil futures contracts between the period ended June 30, 2010 and the period ended June 30, 2011.

Portfolio Expenses. USOF’s expenses consist of investment management fees, brokerage fees and commissions, certain offering costs, licensing fees, the fees and expenses of the independent directors of USCF and expenses relating to tax accounting and reporting requirements. The management fee that USOF pays to USCF is calculated as a percentage of the total net assets of USOF. USOF pays USCF a management fee of 0.45% of its average net assets. The fee is accrued daily and paid monthly.

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During the six months ended June 30, 2011, the daily average total net assets of USOF were $1,755,961,700. The management fee incurred by USOF during the period amounted to $3,918,441. By comparison, during the six months ended June 30, 2010, the daily average total net assets of USOF were $2,000,099,100. The management fee paid by USOF during the period amounted to $4,463,235.

In addition to the management fee, USOF pays all brokerage fees and other expenses, including certain tax reporting costs, licensing fees for the use of intellectual property, ongoing registration or other fees paid to the SEC, the Financial Industry Regulatory Authority (“FINRA”) and any other regulatory agency in connection with offers and sales of its units subsequent to the initial offering and all legal, accounting, printing and other expenses associated therewith. The total of these fees and expenses for the six months ended June 30, 2011 was $1,860,598, as compared to $2,582,456 for the six months ended June 30, 2010. The decrease in expenses for the six months ended June 30, 2011 as compared to the six months ended June 30, 2010 was primarily due to reduced costs associated with the registration and the offering of additional units, decreased licensing fees and decreased tax reporting costs during the six months ended June 30, 2011. For the six months ended June 30, 2011, USOF incurred $23,530 in ongoing registration fees and other expenses relating to the registration and offering of additional units. By comparison, for the six months ended June 30, 2010, USOF incurred $42,850 in ongoing registration fees and other expenses relating to the registration and offering of additional units. The decrease in registration fees and expenses incurred by USOF for the six months ended June 30, 2011, as compared to the six months ended June 30, 2010 was primarily due to a slower amortization of prepaid registration costs, which were matched to a slower expected rate of unit creations during the six months ended June 30, 2011.

USOF is responsible for paying its portion of the directors’ and officers’ liability insurance of all affiliated funds for which USCF serves as general partner and sponsor (all affiliated funds including the United States Commodity Index Fund (“USCI”)) and the fees and expenses of the independent directors who also serve as audit committee members of those affiliated USCF funds organized as limited partnerships (all affiliated funds, excluding USCI). Affiliated funds of USOF include the United States Natural Gas Fund, LP (“USNG”), the United States 12 Month Oil Fund, LP (“US12OF”), the United States Gasoline Fund, LP (“UGA”), the United States Heating Oil Fund, LP (“USHO”), the United States Short Oil Fund, LP (“USSO”), the United States 12 Month Natural Gas Fund, LP (“US12NG”), the United States Brent Oil Fund, LP (“USBO”) and USCI. USOF shares the fees and expenses with each affiliated fund, as described above, based on the relative assets of each fund computed on a daily basis. These fees and expenses for the year ending December 31, 2011 are estimated to be a total of $540,000 for all affiliated funds, except USCI. By comparison, for the year ended December 31, 2010, these fees and expenses amounted to a total of $1,107,140 for all affiliated funds, except USCI, and USOF’s portion of such fees and expenses was $413,042. Effective as of April 1, 2010, USOF became responsible for paying its portion of any payments that may become due to the independent directors pursuant to the deferred compensation agreements entered into between the independent directors, USCF and the affiliated funds, except USCI.

USOF also incurs commissions to brokers for the purchase and sale of Oil Futures Contracts, Other Oil Interests or short term obligations of the United States of two years or less (“Treasuries”). During the six months ended June 30, 2011, total commissions paid to brokers amounted to $843,195. By comparison, during the six months ended June 30, 2010, total commissions paid to brokers amounted to $1,018,256. The decrease in the total commissions paid to brokers for the six months ended June 30, 2011 as compared to the six months ended June 30, 2010 was primarily a result of the decrease in USOF’s average total net assets and an increase in the price of crude oil futures contracts during the six months ended June 30, 2011. As an annualized percentage of total net assets, the figure for the six months ended June 30, 2011 represents approximately 0.09% of total net assets. By comparison, the figure for the six months ended June 30, 2010 represented approximately 0.10% of total net assets. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters.

The fees and expenses associated with USOF’s audit expenses and tax accounting and reporting requirements are paid by USOF. These costs are estimated to be $1,000,000 for the year ending December 31, 2011.

Dividend and Interest Income. USOF seeks to invest its assets such that it holds Oil Futures Contracts and Other Oil Interests in an amount equal to the total net assets of its portfolio. Typically, such investments do not require USOF to pay the full amount of the contract value at the time of purchase, but rather require USOF to post an amount as a margin deposit against the eventual settlement of the contract. As a result, USOF retains an amount that is approximately equal to its total net assets, which USOF invests in Treasuries, cash and/or cash equivalents. This includes both the amount on deposit with the futures commission merchant as

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margin, as well as unrestricted cash and cash equivalents held with USOF’s custodian bank. The Treasuries, cash and/or cash equivalents earn income that accrues on a daily basis. For the six months ended June 30, 2011, USOF earned $169,144 in dividend and interest income on such cash and/or cash equivalents. Based on USOF’s average daily total net assets, this was equivalent to an annualized yield of 0.02%. USOF did not purchase Treasuries during the six months ended June 30, 2011 and held only cash and/or cash equivalents during this time period. By comparison, for the six months ended June 30, 2010, USOF earned $313,863 in dividend and interest income on such cash and/or cash equivalents. Based on USOF’s average daily total net assets, this was equivalent to an annualized yield of 0.03%. USOF did not purchase Treasuries during the six months ended June 30, 2010 and held only cash and/or cash equivalents during this time period. Interest rates on short-term investments, including cash, cash equivalents and Treasuries, were slightly lower during the six months ended June 30, 2011 compared to the six months ended June 30, 2010. As a result, the amount of income earned by USOF as a percentage of total net assets was lower during the six months ended June 30, 2011 compared to the six months ended June 30, 2010.

For the Three Months Ended June 30, 2011 Compared to the Three Months Ended June 30, 2010

Portfolio Expenses. During the three months ended June 30, 2011, the daily average total net assets of USOF were $1,590,917,801. The management fee incurred by USOF during the period amounted to $1,784,880. By comparison, during the three months ended June 30, 2010, the daily average total net assets of USOF were $1,961,891,772. The management fee paid by USOF during the period amounted to $2,201,018.

In addition to the management fee, USOF pays all brokerage fees and other expenses, including certain tax reporting costs, licensing fees for the use of intellectual property, ongoing registration or other fees paid to the SEC, FINRA and any other regulatory agency in connection with offers and sales of its units subsequent to the initial offering and all legal, accounting, printing and other expenses associated therewith. The total of these fees and expenses for the three months ended June 30, 2011 was $854,481, as compared to $1,317,832 for the three months ended June 30, 2010. The decrease in expenses for the three months ended June 30, 2011 as compared to the three months ended June 30, 2010 was primarily due to reduced costs associated with the registration and the offering of additional units, decreased licensing fees and decreased tax reporting costs during the three months ended June 30, 2011. For the three months ended June 30, 2011, USOF incurred $11,830 in ongoing registration fees and other expenses relating to the registration and offering of additional units. By comparison, for the three months ended June 30, 2010, USOF incurred $20,350 in ongoing registration fees and other expenses relating to the registration and offering of additional units. The decrease in registration fees and expenses incurred by USOF for the three months ended June 30, 2011, as compared to the three months ended June 30, 2010 was primarily due to a slower amortization of prepaid registration costs, which were matched to a slower expected rate of unit creations during the three months ended June 30, 2010.

USOF is responsible for paying its portion of the directors’ and officers’ liability insurance of all affiliated funds for which USCF serves as general partner and sponsor (all affiliated funds including USCI) and the fees and expenses of the independent directors who also serve as audit committee members of those affiliated USCF funds organized as limited partnerships (all affiliated funds, excluding USCI). Affiliated funds of USOF include USNG, US12OF, UGA, USHO, USSO, US12NG, USBO and USCI. USOF shares the fees and expenses with each affiliated fund, as described above, based on the relative assets of each fund computed on a daily basis. These fees and expenses for the year ending December 31, 2011 are estimated to be a total of $540,000 for all affiliated funds, except USCI. By comparison, for the year ended December 31, 2010, these fees and expenses amounted to a total of $1,107,140 for all affiliated funds, except USCI, and USOF’s portion of such fees and expenses was $413,042. Effective as of April 1, 2010, USOF became responsible for paying its portion of any payments that may become due to the independent directors pursuant to the deferred compensation agreements entered into between the independent directors, USCF and the affiliated funds, except USCI.

USOF also incurs commissions to brokers for the purchase and sale of Oil Futures Contracts, Other Oil Interests or Treasuries. During the three months ended June 30, 2011, total commissions paid to brokers amounted to $361,481. By comparison, during the three months ended June 30, 2010, total commissions paid to brokers amounted to $550,220. The decrease in the total commissions paid to brokers for the three months ended June 30, 2011 as compared to the three months ended June 30, 2010 was primarily a result of the decrease in USOF’s average total net assets and an increase in the price of crude oil futures contracts during the three months ended June 30, 2011. As an annualized percentage of total net assets, the figure for the three months ended June 30, 2011 represents

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approximately 0.09% of total net assets. By comparison, the figure for the three months ended June 30, 2010 represented approximately 0.11% of total net assets. However, there can be no assurance that commission costs and portfolio turnover will not cause commission expenses to rise in future quarters.

The fees and expenses associated with USOF’s audit expenses and tax accounting and reporting requirements are paid by USOF. These costs are estimated to be $1,000,000 for the year ending December 31, 2011.

Dividend and Interest Income. USOF seeks to invest its assets such that it holds Oil Futures Contracts and Other Oil Interests in an amount equal to the total net assets of its portfolio. Typically, such investments do not require USOF to pay the full amount of the contract value at the time of purchase, but rather require USOF to post an amount as a margin deposit against the eventual settlement of the contract. As a result, USOF retains an amount that is approximately equal to its total net assets, which USOF invests in Treasuries, cash and/or cash equivalents. This includes both the amount on deposit with the futures commission merchant as margin, as well as unrestricted cash and cash equivalents held with USOF’s custodian bank. The Treasuries, cash and/or cash equivalents earn income that accrues on a daily basis. For the three months ended June 30, 2011, USOF earned $43,357 in dividend and interest income on such cash and/or cash equivalents. Based on USOF’s average daily total net assets, this was equivalent to an annualized yield of 0.01%. USOF did not purchase Treasuries during the three months ended June 30, 2011 and held only cash and/or cash equivalents during this time period. By comparison, for the three months ended June 30, 2010, USOF earned $207,169 in dividend and interest income on such cash and/or cash equivalents. Based on USOF’s average daily total net assets, this was equivalent to an annualized yield of 0.04%. USOF did not purchase Treasuries during the three months ended June 30, 2010 and held only cash and/or cash equivalents during this time period. Interest rates on short-term investments, including cash, cash equivalents and Treasuries, were slightly lower during the three months ended June 30, 2011 compared to the three months ended June 30, 2010. As a result, the amount of income earned by USOF as a percentage of total net assets was lower during the three months ended June 30, 2011 compared to the three months ended June 30, 2010.

Tracking USOF’s Benchmark

USCF seeks to manage USOF’s portfolio such that changes in its average daily NAV, on a percentage basis, closely track the changes in the average daily price of the Benchmark Oil Futures Contract, also on a percentage basis. Specifically, USCF seeks to manage the portfolio such that over any rolling period of 30 valuation days, the average daily change in USOF’s NAV is within a range of 90% to 110% (0.9 to 1.1) of the average daily change in the price of the Benchmark Oil Futures Contract. As an example, if the average daily movement of the price of the Benchmark Oil Futures Contract for a particular 30-valuation day time period was 0.5% per day, USCF would attempt to manage the portfolio such that the average daily movement of the NAV during that same time period fell between 0.45% and 0.55% (i.e., between 0.9 and 1.1 of the benchmark’s results). USOF’s portfolio management goals do not include trying to make the nominal price of USOF’s NAV equal to the nominal price of the current Benchmark Oil Futures Contract or the spot price for light, sweet crude oil. USCF believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in listed Oil Futures Contracts.

For the 30 valuation days ended June 30, 2011, the simple average daily change in the Benchmark Oil Futures Contract was -0.175%, while the simple average daily change in the NAV of USOF over the same time period was -0.178%. The average daily difference was -0.003% (or -0.3 basis points, where 1 basis point equals 1/100 of 1%). As a percentage of the daily movement of the Benchmark Oil Futures Contract, the average error in daily tracking by the NAV was -0.817%, meaning that over this time period USOF’s tracking error was within the plus or minus 10% range established as its benchmark tracking goal. A significant portion of the level of USOF’s relative tracking error as a percentage of the benchmark was due to periods of flat price returns. The first chart below shows the daily movement of USOF’s NAV versus the daily movement of the Benchmark Oil Futures Contract for the 30-valuation day period ended June 30, 2011. The second chart below shows the monthly total returns of USOF as compared to the monthly value of the Benchmark Oil Futures Contract since inception.

Since the commencement of the offering of USOF’s units to the public on April 10, 2006 to June 30, 2011, the simple average daily change in the Benchmark Oil Futures Contract was -0.017%, while the simple average daily change in the NAV of USOF over the same time period was -0.014%. The average daily difference was -0.003% (or -0.3 basis points, where 1 basis point equals 1/100 of 1%). As a percentage of the daily movement of the Benchmark Oil Futures Contract, the average error in daily tracking by the NAV was 0.948%, meaning that over this time period USOF’s tracking error was within the plus or minus 10% range established as its benchmark tracking goal.

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*PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS

*PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS

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An alternative tracking measurement of the return performance of USOF versus the return of its Benchmark Oil Futures Contract can be calculated by comparing the actual return of USOF, measured by changes in its NAV, versus the expected changes in its NAV under the assumption that USOF’s returns had been exactly the same as the daily changes in its Benchmark Oil Futures Contract.

For the six months ended June 30, 2011, the actual total return of USOF as measured by changes in its NAV was -3.95%. This is based on an initial NAV of $38.97 on December 31, 2010 and an ending NAV as of June 30, 2011 of $37.43. During this time period, USOF made no distributions to its unitholders. However, if USOF’s daily changes in its NAV had instead exactly tracked the changes in the daily return of the Benchmark Oil Futures Contract, USOF would have had an estimated NAV of $37.55 as of June 30, 2011, for a total return over the relevant time period of -3.64%. The difference between the actual NAV total return of USOF of -3.95% and the expected total return based on the Benchmark Oil Futures Contract of -3.64% was an error over the time period of -0.31%, which is to say that USOF’s actual total return underperformed the benchmark result by that percentage. USCF believes that a portion of the difference between the actual return and the expected benchmark return can be attributed to the net impact of the expenses that USOF pays, offset in part by the income that USOF collects on its cash and cash equivalent holdings. During the six months ended June 30, 2011, USOF received dividend and interest income of $169,144, which is equivalent to a weighted average income rate of 0.02% for such period. In addition, during the six months ended June 30, 2011, USOF also collected $150,000 from its Authorized Purchasers for creating or redeeming baskets of units. This income also contributed to USOF’s actual return. During the six months ended June 30, 2011, USOF incurred total expenses of $5,779,039. Income from dividends and interest and Authorized Purchaser collections net of expenses was $(5,459,895), which is equivalent to an annualized weighted average net income rate of (0.63)% for the six months ended June 30, 2011.

By comparison, for the six months ended June 30, 2010, the actual total return of USOF as measured by changes in its NAV was -12.82%. This was based on an initial NAV of $39.16 on December 31, 2009 and an ending NAV as of June 30, 2010 of $34.14. During this time period, USOF made no distributions to its unitholders. However, if USOF’s daily changes in its NAV had instead exactly tracked the changes in the daily return of the Benchmark Oil Futures Contract, USOF would have had an estimated NAV of $34.27 as of June 30, 2010, for a total return over the relevant time period of -12.49%. The difference between the actual NAV total return of USOF of -12.82% and the expected total return based on the Benchmark Oil Futures Contract of -12.49% was an error over the time period of -0.33%, which is to say that USOF’s actual total return underperformed the benchmark result by that percentage. USCF believes that a portion of the difference between the actual return and the expected benchmark return can be attributed to the net impact of the expenses that USOF paid, offset in part by the income that USOF collected on its cash and cash equivalent holdings. During the six months ended June 30, 2010, USOF received dividend and interest income of $313,863, which is equivalent to a weighted average income rate of 0.03% for such period. In addition, during the six months ended June 30, 2010, USOF also collected $108,000 from its Authorized Purchasers for creating or redeeming baskets of units. This income also contributed to USOF’s actual return. During the six months ended June 30, 2010, USOF incurred total expenses of $7,045,691. Income from dividends and interest and Authorized Purchaser collections net of expenses was $(6,623,828), which is equivalent to an annualized weighted average net income rate of (0.67)% for the six months ended June 30, 2010.

There are currently three factors that have impacted or are most likely to impact USOF’s ability to accurately track its Benchmark Oil Futures Contract.

First, USOF may buy or sell its holdings in the then current Benchmark Oil Futures Contract at a price other than the closing settlement price of that contract on the day during which USOF executes the trade. In that case, USOF may pay a price that is higher, or lower, than that of the Benchmark Oil Futures Contract, which could cause the changes in the daily NAV of USOF to either be too high or too low relative to the changes in the Benchmark Oil Futures Contract. During the six months ended June 30, 2011, USCF attempted to minimize the effect of these transactions by seeking to execute its purchase or sale of the Benchmark Oil Futures Contract at, or as close as possible to, the end of the day settlement price. However, it may not always be possible for USOF to obtain the closing settlement price and there is no assurance that failure to obtain the closing settlement price in the future will not adversely impact USOF’s attempt to track the Benchmark Oil Futures Contract over time.

Second, USOF earns dividend and interest income on its cash and cash equivalents. USOF is not required to distribute any portion of its income to its unitholders and did not make any distributions to unitholders during the six months ended June 30, 2011. Interest payments, and any other income, were retained within the portfolio and added to USOF’s NAV. When this income exceeds the level

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of USOF’s expenses for its management fee, brokerage commissions and other expenses (including ongoing registration fees, licensing fees and the fees and expenses of the independent directors of USCF), USOF will realize a net yield that will tend to cause daily changes in the NAV of USOF to track slightly higher than daily changes in the Benchmark Oil Futures Contract. During the six months ended June 30, 2011, USOF earned, on an annualized basis, approximately 0.02% on its cash holdings. It also incurred cash expenses on an annualized basis of 0.45% for management fees and approximately 0.09% in brokerage commission costs related to the purchase and sale of futures contracts, and 0.12% for other expenses. The foregoing fees and expenses resulted in a net yield on an annualized basis of approximately (0.64)% and affected USOF’s ability to track its benchmark. If short-term interest rates rise above the current levels, the level of deviation created by the yield would decrease. Conversely, if short-term interest rates were to decline, the amount of error created by the yield would increase. When short-term yields drop to a level lower than the combined expenses of the management fee and the brokerage commissions, then the tracking error becomes a negative number and would tend to cause the daily returns of the NAV to underperform the daily returns of the Benchmark Oil Futures Contract.

Third, USOF may hold Other Oil Interests in its portfolio that may fail to closely track the Benchmark Oil Futures Contract’s total return movements. In that case, the error in tracking the Benchmark Oil Futures Contract could result in daily changes in the NAV of USOF that are either too high, or too low, relative to the daily changes in the Benchmark Oil Futures Contract. During the six months ended June 30, 2011, USOF did not hold any Other Oil Interests. If USOF increases in size, and due to its obligations to comply with regulatory limits, USOF may invest in Other Oil Interests which may have the effect of increasing transaction related expenses and may result in increased tracking error.

Term Structure of Crude Oil Futures Prices and the Impact on Total Returns. Several factors determine the total return from investing in a futures contract position. One factor that impacts the total return that will result from investing in near month futures contracts and “rolling” those contracts forward each month is the price relationship between the current near month contract and the next month contract. For example, if the price of the near month contract is higher than the next month contract (a situation referred to as “backwardation” in the futures market), then absent any other change there is a tendency for the price of a next month contract to rise in value as it becomes the near month contract and approaches expiration. Conversely, if the price of a near month contract is lower than the next month contract (a situation referred to as “contango” in the futures market), then absent any other change there is a tendency for the price of a next month contract to decline in value as it becomes the near month contract and approaches expiration.

As an example, assume that the price of crude oil for immediate delivery (the “spot” price), was $50 per barrel, and the value of a position in the near month futures contract was also $50. Over time, the price of the barrel of crude oil will fluctuate based on a number of market factors, including demand for oil relative to its supply. The value of the near month contract will likewise fluctuate in reaction to a number of market factors. If investors seek to maintain their position in a near month contract and not take delivery of the oil, every month they must sell their current near month contract as it approaches expiration and invest in the next month contract.

If the futures market is in backwardation, e.g., when the expected price of crude oil in the future would be less, the investor would be buying a next month contract for a lower price than the current near month contract. Hypothetically, and assuming no other changes to either prevailing crude oil prices or the price relationship between the spot price, the near month contract and the next month contract (and ignoring the impact of commission costs and the income earned on cash and/or cash equivalents), the value of the next month contract would rise as it approaches expiration and becomes the new near month contract. In this example, the value of the $50 investment would tend to rise faster than the spot price of crude oil, or fall slower. As a result, it would be possible in this hypothetical example for the spot price of crude oil to have risen to $60 after some period of time, while the value of the investment in the futures contract would have risen to $65, assuming backwardation is large enough or enough time has elapsed. Similarly, the spot price of crude oil could have fallen to $40 while the value of an investment in the futures contract could have fallen to only $45. Over time, if backwardation remained constant, the difference would continue to increase.

If the futures market is in contango, the investor would be buying a next month contract for a higher price than the current near month contract. Hypothetically, and assuming no other changes to either prevailing crude oil prices or the price relationship between the spot price, the near month contract and the next month contract (and ignoring the impact of commission costs and the income earned on cash and/or cash equivalents), the value of the next month contract would fall as it approaches expiration and becomes the new near

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month contract. In this example, it would mean that the value of the $50 investment would tend to rise slower than the spot price of crude oil, or fall faster. As a result, it would be possible in this hypothetical example for the spot price of crude oil to have risen to $60 after some period of time, while the value of the investment in the futures contract will have risen to only $55, assuming contango is large enough or enough time has elapsed. Similarly, the spot price of crude oil could have fallen to $45 while the value of an investment in the futures contract could have fallen to $40. Over time, if contango remained constant, the difference would continue to increase.

The chart below compares the price of the near month contract to the average price of the near 12 month contracts over the last 10 years (2001-2010) for light, sweet crude oil. When the price of the near month contract is higher than the average price of the near 12 month contracts, the market would be described as being in backwardation. When the price of the near month contract is lower than the average price of the near 12 month contracts, the market would be described as being in contango. Although the prices of the near month contract and the average price of the near 12 month contracts do tend to move up or down together, it can be seen that at times the near month prices are clearly higher than the average price of the near 12 month contracts (backwardation), and other times they are below the average price of the near 12 month contracts (contango).

*PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS

An alternative way to view the same data is to subtract the dollar price of the average dollar price of the near 12 month contracts for light, sweet crude oil from the dollar price of the near month contract for light, sweet crude oil. If the resulting number is a positive number, then the near month price is higher than the average price of the near 12 months and the market could be described as being in backwardation. If the resulting number is a negative number, then the near month price is lower than the average price of the near 12 months and the market could be described as being in contango. The chart below shows the results from subtracting the average dollar price of the near 12 month contracts from the near month price for the 10 year period between 2001 and 2010.

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*PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS

An investment in a portfolio that involved owning only the near month contract would likely produce a different result than an investment in a portfolio that owned an equal number of each of the near 12 months’ worth of contracts. Generally speaking, when the crude oil futures market is in backwardation, the near month only portfolio would tend to have a higher total return than the 12 month portfolio. Conversely, if the crude oil futures market was in contango, the portfolio containing 12 months’ worth of contracts would tend to outperform the near month only portfolio. The chart below shows the annual results of owning a portfolio consisting of the near month contract and a portfolio containing the near 12 months’ worth of contracts. In addition, the chart shows the annual change in the spot price of light, sweet crude oil. In this example, each month, the near month only portfolio would sell the near month contract at expiration and buy the next month out contract. The portfolio holding an equal number of the near 12 months’ worth of contracts would sell the near month contract at expiration and replace it with the contract that becomes the new twelfth month contract.

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*PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS

As seen in the chart above, there have been periods of both positive and negative annual total returns for both hypothetical portfolios over the last 10 years. In addition, there have been periods during which the near month only approach had higher returns, and periods where the 12 month approach had higher total returns. The above chart does not represent the performance history of USOF or any affiliated funds.

Historically, the crude oil futures markets have experienced periods of contango and backwardation, with backwardation being in place more often than contango. During 2006 and the first half of 2007, these markets experienced contango. However, starting early in the third quarter of 2007, the crude oil futures market moved into backwardation. The crude oil markets remained in backwardation until late in the second quarter of 2008 when they moved into contango. The crude oil markets remained in contango until late in the third quarter of 2008, when the markets moved into backwardation. Early in the fourth quarter of 2008, the crude oil market moved back into contango and remained in contango for the balance of 2008. Throughout 2009, the crude oil market remained in contango. During parts of January and February 2009, the level of contango was unusually steep. Crude oil inventories, which reached historic levels in January and February 2009 and which appeared to be the primary cause of the steep level of contango, began to drop in March 2009 and continued to drop for the balance of 2009 and the beginning of 2010. The crude oil futures market remained in contango through 2010 and has seen periods of contango during the six months ended June 30, 2011.

Periods of contango or backwardation do not materially impact USOF’s investment objective of having the percentage changes in its per unit NAV track the percentage changes in the price of the Benchmark Oil Futures Contract since the impact of backwardation and contango tend to equally impact the percentage changes in price of both USOF’s units and the Benchmark Oil Futures Contract. It is impossible to predict with any degree of certainty whether backwardation or contango will occur in the future. It is likely that both conditions will occur during different periods.

Crude Oil Market. During the six months ended June 30, 2011, crude oil prices were impacted by several factors. On the consumption side, demand increased inside and outside the United States as global economic growth, including emerging economies such as China

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and India, continued to improve during the second quarter of 2011. On the supply side, efforts to reduce production by the Organization of the Petroleum Exporting Countries to more closely match global consumption were partially successful. Production was also disrupted by political unrest in the Middle East, particularly Libya, which reduced global supply by approximately 1.8 million barrels per day. On June 23, 2011, the United States and other industrial nations announced the release of 60 million barrels of crude oil from strategic stockpiles in an effort to reduce the price of fuel. This announcement briefly lowered the price of crude oil, but did not have a lasting impact on the price of crude oil as of June 30, 2011. Crude oil prices finished the second quarter of 2011 approximately 4.42% higher than at the beginning of the year, as the global economy continues to adjust slower than anticipated to periods of slower recovery and economic growth. USCF believes that should the global economic situation cease to improve, or decline, there is a meaningful possibility that crude oil prices could further retreat from their current levels.

Crude Oil Price Movements in Comparison to Other Energy Commodities and Investment Categories. USCF believes that investors frequently measure the degree to which prices or total returns of one investment or asset class move up or down in value in concert with another investment or asset class. Statistically, such a measure is usually done by measuring the correlation of the price movements of the two different investments or asset classes over some period of time. The correlation is scaled between 1 and -1, where 1 indicates that the two investment options move up or down in price or value together, known as “positive correlation,” and -1 indicates that they move in completely opposite directions, known as “negative correlation.” A correlation of 0 would mean that the movements of the two are neither positively nor negatively correlated, known as “non-correlation.” That is, the investment options sometimes move up and down together and other times move in opposite directions.

For the ten-year time period between June 30, 2001 and June 30, 2011, the chart below compares the monthly movements of crude oil prices versus the monthly movements of the prices of several other energy commodities, such as natural gas, heating oil, and unleaded gasoline, as well as several major non-commodity investment asset classes, such as large cap U.S. equities, U.S. government bonds and global equities. It can be seen that over this particular time period, the movement of crude oil on a monthly basis was not strongly correlated, positively or negatively, with the movements of large cap U.S. equities or U.S. government bonds. However, movements in crude oil had a strong positive correlation to movements in heating oil and unleaded gasoline. Finally, crude oil had a positive, but weaker, correlation with global equities and natural gas.

Correlation Matrix June 30, 2001-2011	Large Cap U.S. Equities (S&P 500)		U.S. Gov’t. Bonds (EFFAS U.S. Gov’t. Bond Index)		Global Equities (FTSE World Index)		Unleaded Gasoline		Heating Oil		Natural Gas		Crude Oil
Large Cap U.S. Equities (S&P 500)		1.000		-0.328		0.968		0.189		0.204		0.041		0.208
U.S. Gov’t. Bonds (EFFAS U.S. Gov’t. Bond Index)				1.000		-0.294		-0.254		-0.131		0.104		-0.161
Global Equities (FTSE World Index)						1.000		0.248		0.288		0.095		0.296
Unleaded Gasoline								1.000		0.728		0.308		0.728
Heating Oil										1.000		0.507		0.812
Natural Gas												1.000		0.389
Crude Oil														1.000

Source: Bloomberg, NYMEX

PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS

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The chart below covers a more recent, but much shorter, range of dates than the above chart. Over the one-year period ended June 30, 2011, crude oil continued to have a moderate positive correlation with global equities. However, crude oil had a positive, but weaker, correlation with the movements of unleaded gasoline, heating oil and natural gas compared to what it had displayed over the ten-year period ended June 30, 2011. Notably, the correlation between crude oil and both large cap U.S. equities, which had been essentially non-correlated over the ten-year period ended June 30, 2011, displayed results that indicated that they had a strong positive correlation over this shorter time period, potentially due to the recent upturn in the U.S. economy. Finally, the results showed that crude oil and U.S. government bonds, which had essentially been non-correlated for the ten-year period ended June 30, 2011, were negatively correlated over this more recent time period.

Correlation Matrix 12 months ended June 30, 2011	Large Cap U.S. Equities (S&P 500)		U.S. Gov’t. Bonds (EFFAS U.S. Gov’t. Bond Index)		Global Equities (FTSE World Index)		Unleaded Gasoline		Heating Oil		Natural Gas		Crude Oil
Large Cap U.S. Equities (S&P 500)		1.000		-0.444		0.985		0.632		0.829		0.356		0.751
U.S. Gov’t. Bonds (EFFAS U.S. Gov’t. Bond Index)				1.000		-0.400		-0.469		-0.534		-0.197		-0.544
Global Equities (FTSE World Index)						1.000		0.613		0.795		0.350		0.275
Unleaded Gasoline								1.000		0.862		0.593		0.264
Heating Oil										1.000		0.457		0.271
Natural Gas												1.000		0.217
Crude Oil														1.000

Source: Bloomberg, NYMEX

PAST PERFORMANCE IS NOT NECESSARILY INDICATIVE OF FUTURE RESULTS

Investors are cautioned that the historical price relationships between crude oil and various other energy commodities, as well as other investment asset classes, as measured by correlation may not be reliable predictors of future price movements and correlation results. The results pictured above would have been different if a different range of dates had been selected. USCF believes that crude oil has historically not demonstrated a strong correlation with equities or bonds over long periods of time. However, USCF also believes that in the future it is possible that crude oil could have long term correlation results that indicate prices of crude oil more closely track the movements of equities or bonds. In addition, USCF believes that, when measured over time periods shorter than ten years, there will always be some periods where the correlation of crude oil to equities and bonds will be either more strongly positively correlated or more strongly negatively correlated than the long term historical results suggest.

The correlations between crude oil, natural gas, heating oil and gasoline are relevant because USCF endeavors to invest USOF’s assets in Oil Futures Contracts and Other Oil Interests so that daily changes in percentage terms in USOF’s NAV correlate as closely as possible with daily changes in percentage terms in the price of the Benchmark Oil Futures Contract. If certain other fuel-based commodity futures contracts do not closely correlate with the crude Oil Futures Contract, then their use could lead to greater tracking error. As noted above, USCF also believes that the changes in percentage terms in the price of the Benchmark Oil Futures Contract will closely correlate with changes in percentage terms in the spot price of light, sweet crude oil.

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Critical Accounting Policies

Preparation of the condensed financial statements and related disclosures in compliance with accounting principles generally accepted in the United States of America requires the application of appropriate accounting rules and guidance, as well as the use of estimates. USOF’s application of these policies involves judgments and actual results may differ from the estimates used.

USCF has evaluated the nature and types of estimates that it makes in preparing USOF’s condensed financial statements and related disclosures and has determined that the valuation of its investments, which are not traded on a United States or internationally recognized futures exchange (such as forward contracts and over-the-counter contracts) involves a critical accounting policy. The values which are used by USOF for its Oil Futures Contracts are provided by its commodity broker who uses market prices when available, while over-the-counter contracts are valued based on the present value of estimated future cash flows that would be received from or paid to a third party in settlement of these derivative contracts prior to their delivery date and valued on a daily basis. In addition, USOF estimates interest and dividend income on a daily basis using prevailing rates earned on its cash and cash equivalents. These estimates are adjusted to the actual amount received on a monthly basis and the difference, if any, is not considered material.

Liquidity and Capital Resources

USOF has not made, and does not anticipate making, use of borrowings or other lines of credit to meet its obligations. USOF has met, and it is anticipated that USOF will continue to meet, its liquidity needs in the normal course of business from the proceeds of the sale of its investments, or from the Treasuries, cash and/or cash equivalents that it intends to hold at all times. USOF’s liquidity needs include: redeeming units, providing margin deposits for its existing Oil Futures Contracts or the purchase of additional Oil Futures Contracts and posting collateral for its over-the-counter contracts and payment of its expenses, summarized below under “Contractual Obligations.”

USOF currently generates cash primarily from: (i) the sale of baskets consisting of 100,000 units (“Creation Baskets”) and (ii) income earned on cash and/or cash equivalents. USOF has allocated substantially all of its net assets to trading in Oil Interests. USOF invests in Oil Interests to the fullest extent possible without being leveraged or unable to satisfy its current or potential margin or collateral obligations with respect to its investments in Oil Futures Contracts and Other Oil Interests. A significant portion of USOF’s NAV is held in cash and cash equivalents that are used as margin and as collateral for its trading in Oil Interests. The balance of the net assets is held in USOF’s account at its custodian bank. Income received from USOF’s money market funds is paid to USOF. In prior periods, the amount of cash earned by USOF from the sale of Creation Baskets and from income earned has exceeded the amount of cash required to pay USOF’s expenses. However, during the six months ended June 30, 2011, USOF’s expenses exceeded the income USOF earned and the cash earned from the sale of Creation Baskets. During the six months ended June 30, 2011, USOF was forced to use other assets to pay cash expenses, which could cause a drop in USOF’s NAV over time. To the extent expenses exceed income, USOF’s NAV will be negatively impacted.

USOF’s investments in Oil Interests may be subject to periods of illiquidity because of market conditions, regulatory considerations and other reasons. For example, most commodity exchanges limit the fluctuations in futures contracts prices during a single day by regulations referred to as “daily limits.” During a single day, no trades may be executed at prices beyond the daily limit. Once the price of a futures contract has increased or decreased by an amount equal to the daily limit, positions in the contracts can neither be taken nor liquidated unless the traders are willing to effect trades at or within the specified daily limit. Such market conditions could prevent USOF from promptly liquidating its positions in Oil Futures Contracts. During the six months ended June 30, 2011, USOF was not forced to purchase or liquidate any of its positions while daily limits were in effect; however, USOF cannot predict whether such an event may occur in the future.

Since March 23, 2007, USOF has been responsible for expenses relating to: (i) management fees, (ii) brokerage fees and commissions, (iii) licensing fees for the use of intellectual property, (iv) ongoing registration expenses in connection with offers and sales of its units subsequent to the initial offering, (v) other expenses, including certain tax reporting costs, (vi) fees and expenses of

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the independent directors of USCF and (vii) other extraordinary expenses not in the ordinary course of business, while USCF has been responsible for expenses relating to the fees of USOF’s Marketing Agent, Administrator and Custodian and registration expenses relating to the initial offering of units. If USCF and USOF are unsuccessful in raising sufficient funds to cover these respective expenses or in locating any other source of funding, USOF will terminate and investors may lose all or part of their investment.

Market Risk

Trading in Oil Futures Contracts and Other Oil Interests, such as forwards, involves USOF entering into contractual commitments to purchase or sell oil at a specified date in the future. The aggregate market value of the contracts will significantly exceed USOF’s future cash requirements since USOF intends to close out its open positions prior to settlement. As a result, USOF is generally only subject to the risk of loss arising from the change in value of the contracts. USOF considers the “fair value” of its derivative instruments to be the unrealized gain or loss on the contracts. The market risk associated with USOF’s commitments to purchase oil is limited to the aggregate market value of the contracts held. However, should USOF enter into a contractual commitment to sell oil, it would be required to make delivery of the oil at the contract price, repurchase the contract at prevailing prices or settle in cash. Since there are no limits on the future price of oil, the market risk to USOF could be unlimited.

USOF’s exposure to market risk depends on a number of factors, including the markets for oil, the volatility of interest rates and foreign exchange rates, the liquidity of the Oil Futures Contracts and Other Oil Interests markets and the relationships among the contracts held by USOF. Drastic market occurrences could ultimately lead to the loss of all or substantially all of an investor’s capital.

Credit Risk

When USOF enters into Oil Futures Contracts and Other Oil Interests, it is exposed to the credit risk that the counterparty will not be able to meet its obligations. The counterparty for the Oil Futures Contracts traded on the NYMEX and on most other futures exchanges is the clearinghouse associated with the particular exchange. In general, in addition to margin required to be posted by the clearinghouse in connection with cleared trades, clearinghouses are backed by their members who may be required to share in the financial burden resulting from the nonperformance of one of their members and, therefore, this additional member support should significantly reduce credit risk. Some foreign exchanges are not backed by their clearinghouse members but may be backed by a consortium of banks or other financial institutions. There can be no assurance that any counterparty, clearinghouse, or their members or their financial backers will satisfy their obligations to USOF in such circumstances.

USCF attempts to manage the credit risk of USOF by following various trading limitations and policies. In particular, USOF generally posts margin and/or holds liquid assets that are approximately equal to the market value of its obligations to counterparties under the Oil Futures Contracts and Other Oil Interests it holds. USCF has implemented procedures that include, but are not limited to, executing and clearing trades only with creditworthy parties and/or requiring the posting of collateral or margin by such parties for the benefit of USOF to limit its credit exposure. UBS Securities LLC, USOF’s commodity broker, or any other broker that may be retained by USOF in the future, when acting as USOF’s futures commission merchant in accepting orders to purchase or sell Oil Futures Contracts on United States exchanges, is required by CFTC regulations to separately account for and segregate as belonging to USOF, all assets of USOF relating to domestic Oil Futures Contracts trading. These futures commission merchants are not allowed to commingle USOF’s assets with their other assets. In addition, the CFTC requires commodity brokers to hold in a secure account USOF’s assets related to foreign Oil Futures Contracts trading. During the six months ended June 30, 2011, the only foreign exchange on which USOF made investments was the ICE Futures, which is a London based futures exchange. Those crude oil contracts are denominated in U.S. dollars.

If, in the future, USOF purchases over-the-counter contracts, see “Item 3. Quantitative and Qualitative Disclosures About Market Risk” in this quarterly report on Form 10-Q for a discussion of over-the-counter contracts.

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As of June 30, 2011, USOF had deposits in domestic and foreign financial institutions, including cash investments in money market funds, in the amount of $1,579,528,256. This amount is subject to loss should these institutions cease operations.

Off Balance Sheet Financing

As of June 30, 2011, USOF has no loan guarantee, credit support or other off-balance sheet arrangements of any kind other than agreements entered into in the normal course of business, which may include indemnification provisions relating to certain risks that service providers undertake in performing services which are in the best interests of USOF. While USOF’s exposure under these indemnification provisions cannot be estimated, they are not expected to have a material impact on USOF’s financial position.

Redemption Basket Obligation

In order to meet its investment objective and pay its contractual obligations described below, USOF requires liquidity to redeem units, which redemptions must be in blocks of 100,000 units called “Redemption Baskets”. USOF has to date satisfied this obligation by paying from the cash or cash equivalents it holds or through the sale of its Treasuries in an amount proportionate to the number of units being redeemed.

Contractual Obligations

USOF’s primary contractual obligations are with USCF. In return for its services, USCF is entitled to a management fee calculated monthly as a fixed percentage of USOF’s NAV, currently 0.45% of NAV on its average daily net assets.

USCF agreed to pay the start-up costs associated with the formation of USOF, primarily its legal, accounting and other costs in connection with USCF’s registration with the CFTC as a CPO and the registration and listing of USOF and its units with the SEC, FINRA and the AMEX, respectively. However, since USOF’s initial offering of units, offering costs incurred in connection with registering and listing additional units of USOF have been directly borne on an ongoing basis by USOF, and not by USCF.

USCF pays the fees of USOF’s marketing agent, ALPS Distributors, Inc., and the fees of the custodian and transfer agent, Brown Brothers Harriman & Co. (“BBH&Co.”), as well as BBH&Co.’s fees for performing administrative services, including those in connection with the preparation of USOF’s condensed financial statements and its SEC and CFTC reports. USCF and USOF have also entered into a licensing agreement with the NYMEX pursuant to which USOF and the affiliated funds managed by USCF, other than USBO and USCI, pay a licensing fee to the NYMEX. USOF also pays the fees and expenses associated with its tax accounting and reporting requirements.

In addition to USCF’s management fee, USOF pays its brokerage fees (including fees to a futures commission merchant), over-the-counter dealer spreads, any licensing fees for the use of intellectual property, and, subsequent to the initial offering, registration and other fees paid to the SEC, FINRA, or other regulatory agencies in connection with the offer and sale of units, as well as legal, printing, accounting and other expenses associated therewith, and extraordinary expenses. The latter are expenses not incurred in the ordinary course of USOF’s business, including expenses relating to the indemnification of any person against liabilities and obligations to the extent permitted by law and under the LP Agreement, the bringing or defending of actions in law or in equity or otherwise conducting litigation and incurring legal expenses and the settlement of claims and litigation. Commission payments to a futures commission merchant are on a contract-by-contract, or round turn, basis. USOF also pays a portion of the fees and expenses of the independent directors of USCF. See Note 3 to the Notes to Condensed Financial Statements (Unaudited) in Item 1 of this quarterly report on Form 10-Q.

The parties cannot anticipate the amount of payments that will be required under these arrangements for future periods, as USOF’s NAVs and trading levels to meet its investment objective will not be known until a future date. These agreements are effective for a specific term agreed upon by the parties with an option to renew, or, in some cases, are in effect for the duration of USOF’s existence. Either party may terminate these agreements earlier for certain reasons described in the agreements. As of June 30, 2011, USOF’s portfolio consisted of 9,104 Crude Oil Futures CL August 2011 Contracts traded on the NYMEX and 6,000 WTI Crude Oil Futures August 2011 Contracts traded on the ICE Futures. For a list of USOF’s current holdings, please see USOF’s website at www.unitedstatesoilfund.com.

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Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Over-the-Counter Derivatives (Including Spreads and Straddles)

In the future, USOF may purchase over-the-counter contracts (“OTC Contracts”). Unlike most exchange-traded futures contracts or exchange-traded options on such futures, each party to an OTC Contract bears the credit risk that the other party may not be able to perform its obligations under its contract.

Some crude oil-based derivatives transactions contain fairly generic terms and conditions and are available from a wide range of participants. Other crude oil-based derivatives have highly customized terms and conditions and are not as widely available. Many of these OTC Contracts are cash-settled forwards for the future delivery of crude oil- or petroleum-based fuels that have terms similar to the Oil Futures Contracts. Others take the form of “swaps” in which the two parties exchange cash flows based on pre-determined formulas tied to the spot price of crude oil, forward crude oil price or crude oil futures price. In these swaps, a party pays a fixed price per unit and the other pays a variable price based on the average price of future contracts for a specified period or the price on a specific date, with payments typically made between the parties on a net basis. For example, USOF may enter into OTC Contracts whose value will be tied to changes in the difference between the spot price of light, sweet crude oil, the price of Oil Futures Contracts traded on the NYMEX and the prices of other Oil Futures Contracts in which USOF may invest.

To reduce the credit risk that arises in connection with such contracts, USOF will generally enter into an agreement with each counterparty based on the Master Agreement published by the International Swaps and Derivatives Association, Inc. that provides for the netting of its overall exposure to its counterparty.

USCF assesses or reviews, as appropriate, the creditworthiness of each potential or existing counterparty to an OTC Contract pursuant to guidelines approved by USCF’s board of directors (the “Board”). Furthermore, USCF on behalf of USOF only enters into OTC Contracts with counterparties who are, or are affiliates of, (a) banks regulated by a United States federal bank regulator, (b) broker-dealers regulated by the SEC, (c) insurance companies domiciled in the United States, or (d) producers, users or traders of energy, whether or not regulated by the CFTC. Any entity acting as a counterparty shall be regulated in either the United States or the United Kingdom unless otherwise approved by the Board after consultation with its legal counsel. Existing counterparties are also reviewed periodically by USCF. USOF will also require that the counterparty be highly rated and/or provide collateral or other credit support. Even if collateral is used to reduce counterparty credit risk, sudden changes in the value of OTC transactions may leave a party open to financial risk due to a counterparty default since the collateral held may not cover a party’s exposure on the transaction in such situations.

The Dodd-Frank Act requires the CFTC and SEC to establish both “initial and variation margin requirements” on all swaps that are not cleared by a registered clearing organization (i.e., uncleared swaps). In addition, the Dodd-Frank Act provides parties who post initial margin to a swap dealer or major swap participant with a statutory right to insist that such margin be held in a segregated account with an independent custodian. At this time, the CFTC has proposed rules addressing margin requirements and the statutory right of certain market participants but has not implemented any rules on these issues. On April 12, 2011, the Prudential Regulators and the CFTC issued proposed rules establishing minimum initial and variation margin collection requirements for Covered Swap Entities, which if adopted, would require Covered Swap Entities to collect minimum initial and variation margin amounts from swap counterparties. The public comment period for these rules was extended on June 23, 2011. The Prudential Regulators’ proposed rules would apply to those Covered Swap Entities that are regulated by the Prudential Regulators and the CFTC’s proposed rules would apply to Covered Swap Entities that are not regulated by the Prudential Regulators.

The amount of initial and variation margin that Covered Swap Entities would be required to collect under the proposed rules varies based on whether their counterparty to a particular swap is (1) a Covered Swap Entity, (2) a “high-risk” financial entity end-user, (3) a “low-risk” financial entity end-user (e.g., financial entities subject to capital requirements imposed by bank or insurance regulators, that predominantly use swaps to hedge and that do not have significant swap exposure) or (4) a non-financial end-user. With certain exceptions not applicable to USOF and the affiliated funds managed by USCF, Covered Swap Entities would not be required to post initial or variation margin to any of their counterparties except for other Covered Swap Entities.

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Covered Swap Entities and all financial entity end-users would be required to post initial margin and variation margin when they enter into swaps with Covered Swap Entities. Margin posted by “low-risk” financial entity end-users could be subject to thresholds under the proposed rules. As commodity pools, USOF and the affiliated funds managed by USCF would be “high-risk” financial entity end-users and would therefore have to post margin without thresholds.

The CFTC voted to propose rules for capital requirements for Covered Swap Entities that are not regulated by a Prudential Regulator. Covered Swap Entities that are regulated by a Prudential Regulator will be subject to the capital requirements already imposed by such Prudential Regulator. In general, higher levels of capital would be imposed on Covered Swap Entities that do not collect margin from their counterparties (or that collect margin subject to thresholds) in connection with their swaps, and could increase the costs of such swaps. On July 14, 2011, the CFTC issued an order providing temporary relief from certain swaps-related provisions of Title VII that would have automatically taken effect on July 16, 2011. The final order granted temporary exemptive relief that, by its terms, expires upon the earlier of the effective date of the required final rulemaking or December 31, 2011.

In general, valuing OTC derivatives is less certain than valuing actively traded financial instruments such as exchange-traded futures contracts and securities or cleared swaps because the price and terms on which such OTC derivatives are entered into or can be terminated are individually negotiated, and those prices and terms may not reflect the best price or terms available from other sources. In addition, while market makers and dealers generally quote indicative prices or terms for entering into or terminating OTC Contracts, they typically are not contractually obligated to do so, particularly if they are not a party to the transaction. As a result, it may be difficult to obtain an independent value for an outstanding OTC derivatives transaction.

USOF may employ spreads or straddles in its trading to mitigate the differences in its investment portfolio and its goal of tracking the price of the Benchmark Oil Futures Contract. USOF would use a spread when it chooses to take simultaneous long and short positions in futures written on the same underlying asset, but with different delivery months. The effect of holding such combined positions is to adjust the sensitivity of USOF to changes in the price relationship between futures contracts, which will expire sooner, and those that will expire later. USOF would use such a spread if USCF felt that taking such long and short positions, when combined with the rest of its holdings, would more closely track the investment goals of USOF, or if USCF felt it would lead to an overall lower cost of trading to achieve a given level of economic exposure to movements in oil prices. USOF would enter into a straddle when it chooses to take an option position consisting of a long (or short) position in both a call option and put option. The economic effect of holding certain combinations of put options and call options can be very similar to that of owning the underlying futures contracts. USOF would make use of such a straddle approach if, in the opinion of USCF, the resulting combination would more closely track the investment goals of USOF or if it would lead to an overall lower cost of trading to achieve a given level of economic exposure to movements in oil prices.

During the six months ended June 30, 2011, USOF did not employ any hedging methods such as those described above since all of its investments were made over an exchange. Therefore, during such period, USOF was not exposed to counterparty risk.

USOF anticipates that the use of Other Oil Interests together with its investments in Oil Futures Contracts will produce price and total return results that closely track the investment goals of USOF. However, there can be no assurance of this. OTC Contracts may result in higher transaction-related expenses than the brokerage commissions paid in connection with the purchase of Oil Futures Contracts, which may impact USOF’s ability to successfully track the Benchmark Oil Futures Contract.

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Item 4. Controls and Procedures.

Disclosure Controls and Procedures

USOF maintains disclosure controls and procedures that are designed to ensure that material information required to be disclosed in USOF’s periodic reports filed or submitted under the Securities Exchange Act of 1934, as amended, is recorded, processed, summarized and reported within the time period specified in the SEC’s rules and forms.

The duly appointed officers of USCF, including its chief executive officer and chief financial officer, who perform functions equivalent to those of a principal executive officer and principal financial officer of USOF if USOF had any officers, have evaluated the effectiveness of USOF’s disclosure controls and procedures and have concluded that the disclosure controls and procedures of USOF have been effective as of the end of the period covered by this quarterly report on Form 10-Q.

Change in Internal Control Over Financial Reporting

There were no changes in USOF’s internal control over financial reporting during USOF’s last fiscal quarter that have materially affected, or are reasonably likely to materially affect, USOF’s internal control over financial reporting.

Part II. OTHER INFORMATION

Item 1. Legal Proceedings.

There have been no material changes to the disclosure found under this section in USOF’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010, filed on March 1, 2011.

Item 1A. Risk Factors.

There have been no material changes to the risk factors previously disclosed in USOF’s Annual Report on Form 10-K for the fiscal year ended December 31, 2010, filed on March 1, 2011, except for the addition of the risk factor set forth below.

USOF would be negatively impacted if the United States Treasury were to default on its obligations to make payments on Treasury Securities.

Recent events in Washington DC regarding passing an economic budget have drawn concern regarding the United States Government’s ability to pay its obligations to holders of Treasury Securities. If USOF is not able to redeem its investments in Treasury Securities prior to maturity and the U.S. Government cannot pay its obligations, USOF would be negatively impacted. In addition, USOF might also be negatively impacted by its use of money market mutual funds to the extent those funds might themselves be using Treasury Securities.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Not applicable.

Item 3. Defaults Upon Senior Securities.

Not applicable.

Item 4. Removed and Reserved.

Item 5. Other Information.

Monthly Account Statements

Pursuant to the requirement under Rule 4.22 under the Commodity Exchange Act, each month USOF publishes an account statement for its unitholders, which includes a Statement of Income (Loss) and a Statement of Changes in NAV. The account statement is furnished to the SEC on a current report on Form 8-K pursuant to Section 13 or 15(d) of the Exchange Act and posted each month on USOF’s website at www.unitedstatesoilfund.com.

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Item 6. Exhibits.

Listed below are the exhibits, which are filed as part of this quarterly report on Form 10-Q (according to the number assigned to them in Item 601 of Regulation S-K):

Exhibit Number	Description of Document
31.1(1)	Certification by Principal Executive Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2(1)	Certification by Principal Financial Officer Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1(1)	Certification by Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2(1)	Certification by Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS(2)	XBRL Instance Document
101.SCH(2)	XBRL Taxonomy Extension Schema
101.CAL(2)	XBRL Taxonomy Extension Calculation Linkbase
101.DEF(2)	XBRL Taxonomy Extension Definition Linkbase
101.LAB(2)	XBRL Taxonomy Extension Label Linkbase
101.PRE(2)	XBRL Taxonomy Extension Presentation Linkbase

(1) Filed herewith.

(2) In accordance with Rule 406T of Regulation S-T, the information in these exhibits is furnished and deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933, is deemed not filed for purposes of Section 18 of the Securities Exchange Act of 1934, and otherwise is not subject to liability under these sections.

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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 thereunto duly authorized.

United States Oil Fund, LP (Registrant)
By: United States Commodity Funds LLC, its general partner
By:	/s/ Nicholas D. Gerber
	Nicholas D. Gerber
	President and Chief Executive Officer (Principal executive officer)

Date: August 9, 2011
By:	/s/ Howard Mah
	Howard Mah
	Chief Financial Officer
	(Principal financial and accounting officer)

Date: August 9, 2011

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EX-31.1

Exhibit 31.1

Certification of Principal Executive Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Nicholas D. Gerber, certify that:

1. I have reviewed this quarterly report on Form 10-Q of United States Oil Fund, LP;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s Board of Directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 9, 2011	By:	/s/ Nicholas D. Gerber
	Name:	Nicholas D. Gerber
	Title:	President and Chief Executive Officer United States Commodity Funds LLC, General Partner of United States Oil Fund, LP

EX-31.2

Exhibit 31.2

Certification of Principal Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Howard Mah, certify that:

1. I have reviewed this quarterly report on Form 10-Q of United States Oil Fund, LP;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s Board of Directors (or persons performing the equivalent functions):

(a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: August 9, 2011	By:	/s/ Howard Mah
	Name:	Howard Mah
	Title:	Chief Financial Officer United States Commodity Funds LLC, General Partner of United States Oil Fund, LP

EX-32.1

Exhibit 32.1

Certification of Principal Executive Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q for the quarter ended June 30, 2011 (the “Report”) of United States Oil Fund, LP (the “Registrant”), as filed with the Securities and Exchange Commission on the date hereof, I, Nicholas D. Gerber, the President and Chief Executive Officer of United States Commodity Funds LLC, General Partner of the Registrant, hereby certify, to the best of my knowledge, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: August 9, 2011	By:	/s/ Nicholas D. Gerber
	Name:	Nicholas D. Gerber
	Title:	President and Chief Executive Officer United States Commodity Funds LLC, General Partner of United States Oil Fund, LP

EX-32.2

Exhibit 32.2

Certification of Principal Financial Officer

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report on Form 10-Q for the quarter ended June 30, 2011 (the “Report”) of United States Oil Fund, LP (the “Registrant”), as filed with the Securities and Exchange Commission on the date hereof, I, Howard Mah, the Chief Financial Officer of United States Commodity Funds LLC, General Partner of the Registrant, hereby certify, to the best of my knowledge, that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

Date: August 9, 2011	By:	/s/ Howard Mah
	Name:	Howard Mah
	Title:	Chief Financial Officer United States Commodity Funds LLC, General Partner of United States Oil Fund, LP

XML



Condensed Schedule of Investments (USD $)	Jun. 30, 2011
Loss on Open Commodity Contracts	$ (59,309,100)
Open Futures Contracts, Long
Number of Contracts	15,104
Loss on Open Commodity Contracts	(59,309,100)
% of Partners' Capital	(4.12%)
Open Futures Contracts, Long | Foreign | ICE WTI Crude Oil Futures August 2011 contracts, expiring July 2011
Number of Contracts	6,000
Loss on Open Commodity Contracts	(32,400,000)
% of Partners' Capital	(2.25%)
Open Futures Contracts, Long | UNITED STATES | NYMEX Crude Oil Futures CL August 2011 contracts, expiring July 2011
Number of Contracts	9,104
Loss on Open Commodity Contracts	(26,909,100)
% of Partners' Capital	(1.87%)
Cash Equivalents | UNITED STATES | Money Market Funds
Market Value	1,090,661,139
% of Partners' Capital	75.68%
Cash Equivalents | UNITED STATES | Money Market Funds | Fidelity Institutional Government Portfolio, Class I
Principal Amount	352,030,128
Market Value	352,030,128
% of Partners' Capital	24.43%
Cash Equivalents | UNITED STATES | Money Market Funds | Goldman Sachs Financial Square Funds, Government Fund, Class SL
Principal Amount	187,745,186
Market Value	187,745,186
% of Partners' Capital	13.03%
Cash Equivalents | UNITED STATES | Money Market Funds | Morgan Stanley Institutional Liquidity Fund, Government Portfolio
Principal Amount	550,885,825
Market Value	$ 550,885,825
% of Partners' Capital	38.22%
Foreign | ICE WTI Crude Oil Futures August 2011 contracts, expiring July 2011
Number of Contracts	6,000
UNITED STATES | NYMEX Crude Oil Futures CL August 2011 contracts, expiring July 2011
Number of Contracts	9,104

XML



Condensed Schedule of Investments (Parenthetical) (Open Futures Contracts, Long)	6 Months Ended
	Jun. 30, 2011
Foreign | ICE WTI Crude Oil Futures August 2011 contracts, expiring July 2011
Expiration date	July 2011
UNITED STATES | NYMEX Crude Oil Futures CL August 2011 contracts, expiring July 2011
Expiration date	July 2011

XML



SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Aditional Information (Detail)	Jun. 30, 2011
Basis points subtracted from overnight Federal Funds Rate	0.32%
Redemption Baskets
Number of units per basket	100,000

XML



Document and Entity Information	6 Months Ended
	Jun. 30, 2011	Jul. 12, 2011
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2011
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q2
Trading Symbol	USO
Entity Registrant Name	United States Oil Fund, LP
Entity Central Index Key	0001327068
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		0

XML



FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES - Additional Information (Detail) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Deposits in domestic and foreign financial institutions, including cash investments in money market funds	$ 1,579,528,256	$ 1,777,458,702

XML



FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS

6 Months Ended

Jun. 30, 2011

FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS

NOTE 3 - FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS

USCF Management Fee

Under the LP Agreement, USCF is responsible for investing the assets of USOF in accordance with the objectives and policies of USOF. In addition, USCF has arranged for one or more third parties to provide administrative, custody, accounting, transfer agency and other necessary services to USOF. For these services, USOF is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.45% per annum of average daily net assets.

Ongoing Registration Fees and Other Offering Expenses

USOF pays all costs and expenses associated with the ongoing registration of its units subsequent to the initial offering. These costs include registration or other fees paid to regulatory agencies in connection with the offer and sale of units, and all legal, accounting, printing and other expenses associated with such offer and sale. For the six months ended June 30, 2011 and 2010, USOF incurred $23,530 and $42,850, respectively, in registration fees and other offering expenses.

Directors’ Fees and Expenses

USOF is responsible for paying its portion of the directors’ and officers’ liability insurance of all affiliated funds for which USCF serves as general partner or sponsor (all affiliated funds including USCI) and the fees and expenses of the independent directors who also serve as audit committee members of those affiliated USCF funds organized as limited partnerships (all affiliated funds, excluding USCI). Effective as of April 1, 2010, USOF became responsible for paying its portion of any payments that may become due to the independent directors pursuant to the deferred compensation agreements entered into between the independent directors, USCF and each of the affiliated funds, except USCI. USOF shares all director fees and expenses, including any that may become due pursuant to the deferred compensation agreements, with all the affiliated funds, except USCI, based on the relative assets of each fund, computed on a daily basis. These fees and expenses for the affiliated funds, except USCI, as described above, for the year ending December 31, 2011, are estimated to be a total of $540,000.

Licensing Fees

As discussed in Note 4 below, USOF entered into a licensing agreement with the NYMEX on May 30, 2007. Pursuant to the agreement, USOF and the affiliated funds managed by USCF, other than USBO and USCI, pay a licensing fee that is equal to 0.04% for the first $1,000,000,000 of combined assets of the funds and 0.02% for combined assets above $1,000,000,000. During the six months ended June 30, 2011 and 2010, USOF incurred $213,932 and $233,206, respectively, under this arrangement.

Investor Tax Reporting Cost

The fees and expenses associated with USOF’s audit expenses and tax accounting and reporting requirements are paid by USOF. These costs are estimated to be $1,000,000 for the year ending December 31, 2011.

Other Expenses and Fees

In addition to the fees described above, USOF pays all brokerage fees and other expenses in connection with the operation of USOF, excluding costs and expenses paid by USCF as outlined in Note 4 below.

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Per Unit Performance Data and Other Supplemental Financial Data (Detail) (USD $)	6 Months Ended
	Jun. 30, 2011		Jun. 30, 2010		Apr. 10, 2006
Per Unit Operating Performance:
Net Asset Value Per Unit, Beginning	$ 38.97		$ 39.16		$ 67.39
Total loss	$ (1.41)		$ (4.89)
Total expenses	$ (0.13)		$ (0.13)
Net decrease in net asset value	$ (1.54)		$ (5.02)
Net Asset Value Per Unit, Ending	$ 37.43		$ 34.14		$ 67.39
Total Return	(3.95%)		(12.82%)
Ratios to Average Net Assets
Total income (loss)	4.92%		(10.34%)
Expenses excluding management fees	0.21%	[1]	0.26%	[1]
Management fees	0.45%	[1]	0.45%	[1]
Net income (loss)	4.59%		(10.69%)

[1] Annualized

XML



CONTRACTS AND AGREEMENTS - Additional information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2011
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual Fee for transfer agency services	$ 20,000
Maximum | Marketing Agreement | USOF's assets from $0- $500 million
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	500,000,000
Maximum | Marketing Agreement | USOF's assets from $500 million - $4 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	4,000,000,000
Minimum | Marketing Agreement | USOF's assets from $0- $500 million
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	0
Minimum | Marketing Agreement | USOF's assets from $500 million - $4 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	500,000,000
Minimum | Marketing Agreement | USSOF's assets in excess of $4 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	4,000,000,000
Marketing Agreement
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Marketing fee exclusive of the incentive fee	425,000
Marketing Agreement | USOF's assets from $0- $500 million
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.00%
Marketing Agreement | USOF's assets from $500 million - $4 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.04%
Marketing Agreement | USSOF's assets in excess of $4 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.03%
Maximum | First $500 million of USNG's, USOF's, US12OF's, UGA's, USHO's, USSO's, US12NG's, USBO's and USCI's combined net assets
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	500,000,000
First $500 million of USNG's, USOF's, US12OF's, UGA's, USHO's, USSO's, US12NG's, USBO's and USCI's combined net assets
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.06%
Maximum | USNG's, USOF's, US12OF's, UGA's, USHO's, USSO's, US12NG's, USBO's and USCI's combined net assets greater than $500 million but less than $1 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	1,000,000,000
Minimum | USNG's, USOF's, US12OF's, UGA's, USHO's, USSO's, US12NG's, USBO's and USCI's combined net assets greater than $500 million but less than $1 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	500,000,000
USNG's, USOF's, US12OF's, UGA's, USHO's, USSO's, US12NG's, USBO's and USCI's combined net assets greater than $500 million but less than $1 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.0465%
Minimum | USNG's, USOF's, US12OF's, UGA's, USHO's, USSO's, US12NG's, USBO's and USCI's combined net assets exceed $1 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Base amount for determining fee percentage	1,000,000,000
USNG's, USOF's, US12OF's, UGA's, USHO's, USSO's, US12NG's, USBO's and USCI's combined net assets exceed $1 billion
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Fee percentage	0.035%
Minimum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Annual Fee for custody, fund accounting and fund administration services	$ 75,000
Transaction fees per transaction	7
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts	7
Maximum
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items]
Transaction fees per transaction	15
Commissions per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts	15

XML



RECENT ACCOUNTING PRONOUNCEMENTS

6 Months Ended

Jun. 30, 2011

RECENT ACCOUNTING PRONOUNCEMENTS

NOTE 8 - RECENT ACCOUNTING PRONOUNCEMENTS

In May 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2011-04, “Fair Value Measurement (Topic 820): Amendments to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRS.” ASU No. 2011-04 clarifies existing requirements for measuring fair value and for disclosure about fair value measurements in converged guidance of the FASB and the International Accounting Standards Board. The amendments are to be applied prospectively. For public entities, the amendments are effective during interim and annual periods beginning after December 15, 2011. For nonpublic entities, the amendments are effective for annual periods beginning after December 15, 2011. Early application by public entities is not permitted. Nonpublic entities may apply the amendments early, but no earlier than for interim periods beginning after December 15, 2011. The implementation of ASU No. 2011-04 is not expected to have a material impact on USOF’s financial statement disclosures.

In January 2010, FASB issued ASU No. 2010-06 “Improving Disclosures about Fair Value Measurements.” ASU No. 2010-06 clarifies existing disclosure and requires additional disclosures regarding fair value measurements. Effective for fiscal years beginning after December 15, 2010, and for interim periods within those fiscal years, entities will need to disclose information about purchases, sales, issuances and settlements of Level 3 securities on a gross basis, rather than as a net number as currently required. The implementation of ASU No. 2010-06 is not expected to have a material impact on USOF’s financial statement disclosures.

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Condensed Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Cash Flows from Operating Activities:
Net income (loss)	$ 80,529,665	$ (213,888,118)
Adjustments to reconcile net income (loss) to cash provided by (used in) operating activities:
(Increase) decrease in commodity futures trading account - cash	(72,402,805)	4,842,916
Unrealized loss on futures contracts	103,269,440	181,464,830
Decrease in dividend receivable and other assets	35,506	4,039
Increase in investment payable	1,137
Decrease in General Partner management fees payable	(191,912)	(81,216)
Decrease in brokerage commissions payable	(13,000)	(25,200)
Decrease in other liabilities	(370,914)	(621,189)
Net cash provided by (used in) operating activities	110,857,117	(28,303,938)
Cash Flows from Financing Activities:
Addition of partnership units	2,906,157,486	1,808,830,974
Redemption of partnership units	(3,287,347,854)	(2,119,454,243)
Net cash used in financing activities	(381,190,368)	(310,623,269)
Net Decrease in Cash and Cash Equivalents	(270,333,251)	(338,927,207)
Cash and Cash Equivalents, beginning of period	1,522,955,092	2,072,425,180
Cash and Cash Equivalents, end of period	$ 1,252,621,841	$ 1,733,497,973

XML



FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES

6 Months Ended

Jun. 30, 2011

FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES

NOTE 5 - FINANCIAL INSTRUMENTS, OFF-BALANCE SHEET RISKS AND CONTINGENCIES

USOF engages in the trading of futures contracts, options on futures contracts and cleared swaps (collectively, “derivatives”). USOF is exposed to both market risk, which is the risk arising from changes in the market value of the contracts, and credit risk, which is the risk of failure by another party to perform according to the terms of a contract.

USOF may enter into futures contracts, options on futures contracts and cleared swaps to gain exposure to changes in the value of an underlying commodity. A futures contract obligates the seller to deliver (and the purchaser to accept) the future delivery of a specified quantity and type of a commodity at a specified time and place. Some futures contracts may call for physical delivery of the asset, while others are settled in cash. The contractual obligations of a buyer or seller may generally be satisfied by taking or making physical delivery of the underlying commodity or by making an offsetting sale or purchase of an identical futures contract on the same or linked exchange before the designated date of delivery.

The purchase and sale of futures contracts, options on futures contracts and cleared swaps require margin deposits with a futures commission merchant. Additional deposits may be necessary for any loss on contract value. The Commodity Exchange Act requires a futures commission merchant to segregate all customer transactions and assets from the futures commission merchant’s proprietary activities.

Futures contracts and cleared swaps involve, to varying degrees, elements of market risk (specifically commodity price risk) and exposure to loss in excess of the amount of variation margin. The face or contract amounts reflect the extent of the total exposure USOF has in the particular classes of instruments. Additional risks associated with the use of futures contracts are an imperfect correlation between movements in the price of the futures contracts and the market value of the underlying securities and the possibility of an illiquid market for a futures contract.

Through June 30, 2011, all of the futures contracts held by USOF were exchange-traded. The risks associated with exchange-traded contracts are generally perceived to be less than those associated with over-the-counter transactions since, in over-the-counter transactions, a party must rely solely on the credit of its respective individual counterparties. However, in the future, if USOF were to enter into non-exchange traded contracts, it would be subject to the credit risk associated with counterparty non-performance. The credit risk from counterparty non-performance associated with such instruments is the net unrealized gain, if any, on the transaction. USOF has credit risk under its futures contracts since the sole counterparty to all domestic and foreign futures contracts is the clearinghouse for the exchange on which the relevant contracts are traded. In addition, USOF bears the risk of financial failure by the clearing broker.

USOF’s cash and other property, such as U.S. Treasuries, deposited with a futures commission merchant are considered commingled with all other customer funds, subject to the futures commission merchant’s segregation requirements. In the event of a futures commission merchant’s insolvency, recovery may be limited to a pro rata share of segregated funds available. It is possible that the recovered amount could be less than the total of cash and other property deposited. The insolvency of a futures commission merchant could result in the complete loss of USOF’s assets posted with that futures commission merchant; however, the vast majority of USOF’s assets are held in U.S. Treasuries, cash and/or cash equivalents with USOF’s custodian and would not be impacted by the insolvency of a futures commission merchant. Also, the failure or insolvency of USOF’s custodian could result in a substantial loss of USOF’s assets.

USCF invests a portion of USOF’s cash in money market funds that seek to maintain a stable net asset value. USOF is exposed to any risk of loss associated with an investment in these money market funds. As of June 30, 2011 and December 31, 2010, USOF had deposits in domestic and foreign financial institutions, including cash investments in money market funds, in the amounts of $1,579,528,256 and $1,777,458,702, respectively. This amount is subject to loss should these institutions cease operations.

For derivatives, risks arise from changes in the market value of the contracts. Theoretically, USOF is exposed to market risk equal to the value of futures contracts purchased and unlimited liability on such contracts sold short. As both a buyer and a seller of options, USOF pays or receives a premium at the outset and then bears the risk of unfavorable changes in the price of the contract underlying the option.

USOF’s policy is to continuously monitor its exposure to market and counterparty risk through the use of a variety of financial, position and credit exposure reporting controls and procedures. In addition, USOF has a policy of requiring review of the credit standing of each broker or counterparty with which it conducts business.

The financial instruments held by USOF are reported in its condensed statement of financial condition at market or fair value, or at carrying amounts that approximate fair value, because of their highly liquid nature and short-term maturity.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)

6 Months Ended

Jun. 30, 2011

Revenue Recognition

Revenue Recognition

Commodity futures contracts, forward contracts, physical commodities, and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the condensed statement of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the condensed financial statements. Changes in the unrealized gains or losses between periods are reflected in the condensed statement of operations. USOF earns interest on its assets denominated in U.S. dollars on deposit with the futures commission merchant at the overnight Federal Funds Rate less 32 basis points. In addition, USOF earns income on funds held at the custodian at prevailing market rates earned on such investments.

Brokerage Commissions

Brokerage Commissions

Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.

Income Taxes

Income Taxes

USOF is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.

In accordance with GAAP, USOF is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. USOF files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. USOF is not subject to income tax return examinations by major taxing authorities for years before 2006 (year of inception). The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in USOF recording a tax liability that reduces net assets. However, USOF’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analyses of and changes to tax laws, regulations and interpretations thereof. USOF recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the period ended June 30, 2011.

Creations and Redemptions

Creations and Redemptions

Authorized Purchasers may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 100,000 units at a price equal to the net asset value of the units calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.

USOF receives or pays the proceeds from units sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Purchasers are reflected in USOF’s condensed statement of financial condition as receivable for units sold, and amounts payable to Authorized Purchasers upon redemption are reflected as payable for units redeemed.

Partnership Capital and Allocation of Partnership Income and Losses

Partnership Capital and Allocation of Partnership Income and Losses

Profit or loss shall be allocated among the partners of USOF in proportion to the number of units each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement.

Calculation of Net Asset Value

Calculation of Net Asset Value

USOF’s net asset value is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing the amount by the total number of units issued and outstanding. USOF uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.

Net Income (Loss) per Unit

Net Income (Loss) per Unit

Net income (loss) per unit is the difference between the net asset value per unit at the beginning of each period and at the end of each period. The weighted average number of units outstanding was computed for purposes of disclosing net income (loss) per weighted average unit. The weighted average units are equal to the number of units outstanding at the end of the period, adjusted proportionately for units redeemed based on the amount of time the units were outstanding during such period. There were no units held by USCF at June 30, 2011.

Offering Costs

Offering Costs

Offering costs incurred in connection with the registration of additional units after the initial registration of units are borne by USOF. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.

Cash equivalents

Cash Equivalents

Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of three months or less.

Reclassification

Reclassification

Certain amounts in the accompanying condensed financial statements were reclassified to conform with the current presentation.

Use of Estimates

Use of Estimates

The preparation of condensed financial statements in conformity with GAAP requires USOF’s management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

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FINANCIAL HIGHLIGHTS

6 Months Ended

Jun. 30, 2011

FINANCIAL HIGHLIGHTS

NOTE 6 - FINANCIAL HIGHLIGHTS

The following table presents per unit performance data and other supplemental financial data for the six months ended June 30, 2011 and 2010 for the unitholders. This information has been derived from information presented in the condensed financial statements.

	For the six months ended June 30, 2011 (Unaudited)			For the six months ended June 30, 2010 (Unaudited)
Per Unit Operating Performance:
Net asset value, beginning of period	$	38.97		$	39.16
Total loss		(1.41	)		(4.89	)
Total expenses		(0.13	)		(0.13	)
Net decrease in net asset value		(1.54	)		(5.02	)
Net asset value, end of period	$	37.43		$	34.14
Total Return		(3.95)	%		(12.82)	%
Ratios to Average Net Assets
Total income (loss)		4.92	%		(10.34)	%
Expenses excluding management fees*		0.21	%		0.26	%
Management fees*		0.45	%		0.45	%
Net income (loss)		4.59	%		(10.69)	%
*  Annualized

Total returns are calculated based on the change in value during the period. An individual unitholder’s total return and ratio may vary from the above total returns and ratios based on the timing of contributions to and withdrawals from USOF.

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CONTRACTS AND AGREEMENTS

6 Months Ended

Jun. 30, 2011

CONTRACTS AND AGREEMENTS

NOTE 4 - CONTRACTS AND AGREEMENTS

USOF is party to a marketing agent agreement, dated as of March 13, 2006, as amended from time to time, with the Marketing Agent and USCF, whereby the Marketing Agent provides certain marketing services for USOF as outlined in the agreement. The fees of the Marketing Agent, which are borne by USCF, include a marketing fee of $425,000 per annum plus the following incentive fee: 0.00% on USOF’s assets from $0 - $500 million; 0.04% on USOF’s assets from $500 million - $4 billion; and 0.03% on USOF’s assets in excess of $4 billion.

The above fees do not include the following expenses, which are also borne by USCF: the cost of placing advertisements in various periodicals; web construction and development; or the printing and production of various marketing materials.

USOF is also party to a custodian agreement, dated March 13, 2006, as amended from time to time, with Brown Brothers Harriman & Co. (“BBH&Co.”) and USCF, whereby BBH&Co. holds investments on behalf of USOF. USCF pays the fees of the custodian, which are determined by the parties from time to time. In addition, USOF is party to an administrative agency agreement, dated March 13, 2006, as amended from time to time, with USCF and BBH&Co., whereby BBH&Co. acts as the administrative agent, transfer agent and registrar for USOF. USCF also pays the fees of BBH&Co. for its services under such agreement and such fees are determined by the parties from time to time.

Currently, USCF pays BBH&Co. for its services, in the foregoing capacities, a minimum amount of $75,000 annually for its custody, fund accounting and fund administration services rendered to USOF and each of the affiliated funds managed by USCF, as well as a $20,000 annual fee for its transfer agency services. In addition, USCF pays BBH&Co. an asset-based charge of (a) 0.06% for the first $500 million of USOF’s, USNG’s, US12OF’s, UGA’s, USHO’s, USSO’s, US12NG’s, USBO’s and USCI’s combined net assets, (b) 0.0465% for USOF’s, USNG’s, US12OF’s, UGA’s, USHO’s, USSO’s, US12NG’s, USBO’s and USCI’s combined net assets greater than $500 million but less than $1 billion, and (c) 0.035% once USOF’s, USNG’s, US12OF’s, UGA’s, USHO’s, USSO’s, US12NG’s, USBO’s and USCI’s combined net assets exceed $1 billion. The annual minimum amount will not apply if the asset-based charge for all accounts in the aggregate exceeds $75,000. USCF also pays transaction fees ranging from $7 to $15 per transaction.

USOF has entered into a brokerage agreement with UBS Securities LLC (“UBS Securities”). The agreement requires UBS Securities to provide services to USOF in connection with the purchase and sale of Oil Futures Contracts and Other Oil Interests that may be purchased and sold by or through UBS Securities for USOF’s account. In accordance with the agreement, UBS Securities charges USOF commissions of approximately $7 to $15 per round-turn trade, including applicable exchange and NFA fees for Oil Futures Contracts and options on Oil Futures Contracts.

On May 30, 2007, USOF and the NYMEX entered into a licensing agreement whereby USOF was granted a non-exclusive license to use certain of the NYMEX’s settlement prices and service marks. Under the licensing agreement, USOF and the affiliated funds managed by USCF, other than USBO and USCI, pay the NYMEX an asset-based fee for the license, the terms of which are described in Note 3.

USOF expressly disclaims any association with the NYMEX or endorsement of USOF by the NYMEX and acknowledges that “NYMEX” and “New York Mercantile Exchange” are registered trademarks of the NYMEX.

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Condensed Statement of Changes in Partners' Capital (USD $)	Total USD ($)	General Partner	Limited Partners USD ($)
Beginning Balances at Dec. 31, 2010	$ 1,788,607,572		$ 1,788,607,572
Net Asset Value Per Unit, Beginning at Dec. 31, 2010	$ 38.97	38.97
Addition of 74,100,000 partnership units	2,906,157,486		2,906,157,486
Redemption of 81,500,000 partnership units	(3,334,177,383)		(3,334,177,383)
Net income	80,529,665		80,529,665
Ending Balances at Jun. 30, 2011	$ 1,441,117,340		$ 1,441,117,340
Net Asset Value Per Unit, Ending at Jun. 30, 2011	$ 37.43	37.43

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Condensed Schedule of Investment

6 Months Ended

Jun. 30, 2011

Condensed Schedule of Investments

United States Oil Fund, LP

Condensed Schedule of Investments (Unaudited)

At June 30, 2011

		$(32,400,000)		$(32,400,000)			$(32,400,000)
	Number of Contracts		Loss on Open Commodity Contracts			% of Partners’ Capital
Open Futures Contracts - Long
Foreign Contracts
ICE WTI Crude Oil Futures August 2011 contracts, expiring July 2011		6,000	$	(32,400,000	)		(2.25	)
United States Contracts
NYMEX Crude Oil Futures CL August 2011 contracts, expiring July 2011		9,104		(26,909,100	)		(1.87	)
Total Open Futures Contracts		15,104	$	(59,309,100	)		(4.12	)
	Principal Amount		Market Value
Cash Equivalents
United States - Money Market Funds
Fidelity Institutional Government Portfolio - Class I	$	352,030,128	$	352,030,128			24.43
Goldman Sachs Financial Square Funds - Government Fund – Class CL		187,745,186		187,745,186			13.03
Morgan Stanley Institutional Liquidity Fund - Government Portfolio		550,885,825		550,885,825			38.22
Total Cash Equivalents			$	1,090,661,139			75.68

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ORGANIZATION AND BUSINESS

6 Months Ended

Jun. 30, 2011

ORGANIZATION AND BUSINESS

NOTE 1 - ORGANIZATION AND BUSINESS

The United States Oil Fund, LP (“USOF”) was organized as a limited partnership under the laws of the state of Delaware on May 12, 2005. USOF is a commodity pool that issues limited partnership units (“units”) that may be purchased and sold on the NYSE Arca, Inc. (the “NYSE Arca”). Prior to November 25, 2008, USOF’s units traded on the American Stock Exchange (the “AMEX”). USOF will continue in perpetuity, unless terminated sooner upon the occurrence of one or more events as described in its Fifth Amended and Restated Agreement of Limited Partnership dated as of October 13, 2008 (the “LP Agreement”). The investment objective of USOF is for the daily changes in percentage terms of its units’ net asset value to reflect the daily changes in percentage terms of the spot price of light, sweet crude oil delivered to Cushing, Oklahoma, as measured by the changes in the price of the futures contract for light, sweet crude oil traded on the New York Mercantile Exchange (the “NYMEX”) that is the near month contract to expire, except when the near month contract is within two weeks of expiration, in which case the futures contract will be the next month contract to expire, less USOF’s expenses. It is not the intent of USOF to be operated in a fashion such that the net asset value will equal, in dollar terms, the spot price of light, sweet crude oil or any particular futures contract based on light, sweet crude oil. United States Commodity Funds LLC (“USCF”) believes that it is not practical to manage the portfolio to achieve such an investment goal when investing in Oil Futures Contracts (as defined below) and Other Oil Interests (as defined below). USOF accomplishes its objective through investments in futures contracts for light, sweet crude oil and other types of crude oil, heating oil, gasoline, natural gas and other petroleum-based fuels that are traded on the NYMEX, ICE Futures or other U.S. and foreign exchanges (collectively, “Oil Futures Contracts”) and other oil-related investments such as cash-settled options on Oil Futures Contracts, forward contracts for oil, cleared swap contracts and over-the-counter transactions that are based on the price of crude oil, heating oil, gasoline, natural gas and other petroleum-based fuels, Oil Futures Contracts and indices based on the foregoing (collectively, “Other Oil Interests”). As of June 30, 2011, USOF held 9,104 Oil Futures Contracts for light, sweet crude oil traded on the NYMEX and 6,000 Oil Futures Contracts for light, sweet crude oil traded on the ICE Futures.

USOF commenced investment operations on April 10, 2006 and has a fiscal year ending on December 31. USCF is responsible for the management of USOF. USCF is a member of the National Futures Association (the “NFA”) and became a commodity pool operator registered with the Commodity Futures Trading Commission (the “CFTC”) effective December 1, 2005. USCF is also the general partner of the United States Natural Gas Fund, LP (“USNG”), the United States 12 Month Oil Fund, LP (“US12OF”), the United States Gasoline Fund, LP (“UGA”) and the United States Heating Oil Fund, LP (“USHO”), which listed their limited partnership units on the AMEX under the ticker symbols “UNG” on April 18, 2007, “USL” on December 6, 2007, “UGA” on February 26, 2008 and “UHN” on April 9, 2008, respectively. As a result of the acquisition of the AMEX by NYSE Euronext, each of USNG’s, US12OF’s, UGA’s and USHO’s units commenced trading on the NYSE Arca on November 25, 2008. USCF is also the general partner of the United States Short Oil Fund, LP (“USSO”), the United States 12 Month Natural Gas Fund, LP (“US12NG”) and the United States Brent Oil Fund, LP (“USBO”), which listed their limited partnership units on the NYSE Arca under the ticker symbols “DNO” on September 24, 2009, “UNL” on November 18, 2009 and “BNO” on June 2, 2010, respectively. USCF is also the sponsor of the United States Commodity Index Fund (“USCI”), a series of the United States Commodity Index Funds Trust (the “Trust”), which listed its units on the NYSE Arca under the ticker symbol “USCI” on August 10, 2010. USCF has also filed a registration statement to register units of the United States Metals Index Fund, the United States Agriculture Index Fund and the United States Copper Index Fund, three additional series of the Trust.

USOF issues units to certain authorized purchasers (“Authorized Purchasers”) by offering baskets consisting of 100,000 units (“Creation Baskets”) through ALPS Distributors, Inc., as the marketing agent (the “Marketing Agent”). The purchase price for a Creation Basket is based upon the net asset value of a unit calculated shortly after the close of the core trading session on the NYSE Arca on the day the order to create the basket is properly received.

In addition, Authorized Purchasers pay USOF a $1,000 fee for each order placed to create one or more Creation Baskets or to redeem one or more baskets consisting of 100,000 units (“Redemption Baskets”). Units may be purchased or sold on a nationally recognized securities exchange in smaller increments than a Creation Basket or Redemption Basket. Units purchased or sold on a nationally recognized securities exchange are not purchased or sold at the net asset value of USOF but rather at market prices quoted on such exchange.

In April 2006, USOF initially registered 17,000,000 units on Form S-1 with the U.S. Securities and Exchange Commission (the “SEC”). On April 10, 2006, USOF listed its units on the AMEX under the ticker symbol “USO”. On that day, USOF established its initial net asset value by setting the price at $67.39 per unit and issued 200,000 units in exchange for $13,479,000. USOF also commenced investment operations on April 10, 2006, by purchasing Oil Futures Contracts traded on the NYMEX based on light, sweet crude oil. As of June 30, 2011, USOF had registered a total of 1,627,000,000 units.

The accompanying unaudited condensed financial statements have been prepared in accordance with Rule 10-01 of Regulation S-X promulgated by the SEC and, therefore, do not include all information and footnote disclosure required under accounting principles generally accepted in the United States of America (“GAAP”). The financial information included herein is unaudited; however, such financial information reflects all adjustments, which are, in the opinion of USCF, necessary for the fair presentation of the condensed financial statements for the interim period.

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Valuation of USOF's Securities Using the Fair Value Hierarchy (Detail) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Foreign | Fair Value, Inputs, Level 1 | Foreign Exchange Future
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ (32,400,000)	$ 22,150,000
UNITED STATES | Fair Value, Inputs, Level 1 | Foreign Exchange Future
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(26,909,100)	21,810,340
Fair Value, Inputs, Level 1 | Short-term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	1,090,661,139	1,490,470,515
Short-term Investments
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	1,090,661,139	1,490,470,515
Foreign | Foreign Exchange Future
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	(32,400,000)	22,150,000
UNITED STATES | Foreign Exchange Future
Schedule of Trading Securities and Other Trading Assets [Line Items]
Securities, fair value	$ (26,909,100)	$ 21,810,340

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Effect of Derivative Instruments on the Condensed Statements of Operations (Detail) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income	$ (16,027,940)	$ (256,875,160)	$ 189,259,000	$ (25,799,460)
Change in Unrealized Gain or (Loss) Recognized in Income			(103,269,440)	(181,464,830)
Commodity Contracts | Closed Positions
Derivative Instruments, Gain (Loss) [Line Items]
Realized Gain or (Loss) on Derivatives Recognized in Income			189,259,000	(25,799,460)
Commodity Contracts | Open Position
Derivative Instruments, Gain (Loss) [Line Items]
Change in Unrealized Gain or (Loss) Recognized in Income			$ (103,269,440)	$ (181,464,830)

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SUBSEQUENT EVENTS

6 Months Ended

Jun. 30, 2011

SUBSEQUENT EVENTS

NOTE 9 - SUBSEQUENT EVENTS

USOF has performed an evaluation of subsequent events through the date the financial statements were issued. This evaluation did not result in any subsequent events that necessitated disclosures and/or adjustments.

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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

6 Months Ended

Jun. 30, 2011

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

NOTE 2 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

Revenue Recognition

Commodity futures contracts, forward contracts, physical commodities, and related options are recorded on the trade date. All such transactions are recorded on the identified cost basis and marked to market daily. Unrealized gains or losses on open contracts are reflected in the condensed statement of financial condition and represent the difference between the original contract amount and the market value (as determined by exchange settlement prices for futures contracts and related options and cash dealer prices at a predetermined time for forward contracts, physical commodities, and their related options) as of the last business day of the year or as of the last date of the condensed financial statements. Changes in the unrealized gains or losses between periods are reflected in the condensed statement of operations. USOF earns interest on its assets denominated in U.S. dollars on deposit with the futures commission merchant at the overnight Federal Funds Rate less 32 basis points. In addition, USOF earns income on funds held at the custodian at prevailing market rates earned on such investments.

Brokerage Commissions

Brokerage commissions on all open commodity futures contracts are accrued on a full-turn basis.

Income Taxes

USOF is not subject to federal income taxes; each partner reports his/her allocable share of income, gain, loss deductions or credits on his/her own income tax return.

In accordance with GAAP, USOF is required to determine whether a tax position is more likely than not to be sustained upon examination by the applicable taxing authority, including resolution of any tax related appeals or litigation processes, based on the technical merits of the position. USOF files an income tax return in the U.S. federal jurisdiction, and may file income tax returns in various U.S. states. USOF is not subject to income tax return examinations by major taxing authorities for years before 2006 (year of inception). The tax benefit recognized is measured as the largest amount of benefit that has a greater than fifty percent likelihood of being realized upon ultimate settlement. De-recognition of a tax benefit previously recognized results in USOF recording a tax liability that reduces net assets. However, USOF’s conclusions regarding this policy may be subject to review and adjustment at a later date based on factors including, but not limited to, on-going analyses of and changes to tax laws, regulations and interpretations thereof. USOF recognizes interest accrued related to unrecognized tax benefits and penalties related to unrecognized tax benefits in income tax fees payable, if assessed. No interest expense or penalties have been recognized as of and for the period ended June 30, 2011.

Creations and Redemptions

Authorized Purchasers may purchase Creation Baskets or redeem Redemption Baskets only in blocks of 100,000 units at a price equal to the net asset value of the units calculated shortly after the close of the core trading session on the NYSE Arca on the day the order is placed.

USOF receives or pays the proceeds from units sold or redeemed within three business days after the trade date of the purchase or redemption. The amounts due from Authorized Purchasers are reflected in USOF’s condensed statement of financial condition as receivable for units sold, and amounts payable to Authorized Purchasers upon redemption are reflected as payable for units redeemed.

Partnership Capital and Allocation of Partnership Income and Losses

Profit or loss shall be allocated among the partners of USOF in proportion to the number of units each partner holds as of the close of each month. USCF may revise, alter or otherwise modify this method of allocation as described in the LP Agreement.

Calculation of Net Asset Value

USOF’s net asset value is calculated on each NYSE Arca trading day by taking the current market value of its total assets, subtracting any liabilities and dividing the amount by the total number of units issued and outstanding. USOF uses the closing price for the contracts on the relevant exchange on that day to determine the value of contracts held on such exchange.

Net Income (Loss) per Unit

Net income (loss) per unit is the difference between the net asset value per unit at the beginning of each period and at the end of each period. The weighted average number of units outstanding was computed for purposes of disclosing net income (loss) per weighted average unit. The weighted average units are equal to the number of units outstanding at the end of the period, adjusted proportionately for units redeemed based on the amount of time the units were outstanding during such period. There were no units held by USCF at June 30, 2011.

Offering Costs

Offering costs incurred in connection with the registration of additional units after the initial registration of units are borne by USOF. These costs include registration fees paid to regulatory agencies and all legal, accounting, printing and other expenses associated with such offerings. These costs are accounted for as a deferred charge and thereafter amortized to expense over twelve months on a straight-line basis or a shorter period if warranted.

Cash Equivalents

Cash equivalents include money market funds and overnight deposits or time deposits with original maturity dates of three months or less.

Reclassification

Certain amounts in the accompanying condensed financial statements were reclassified to conform with the current presentation.

Use of Estimates

The preparation of condensed financial statements in conformity with GAAP requires USOF’s management to make estimates and assumptions that affect the reported amount of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed financial statements, and the reported amounts of the revenue and expenses during the reporting period. Actual results may differ from those estimates and assumptions.

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FAIR VALUE OF FINANCIAL INSTRUMENTS (Tables)

6 Months Ended

Jun. 30, 2011

The Valuation of USOF's Securities Using Fair Value Hierarchy

The following table summarizes the valuation of USOF’s securities at December 31, 2010 using the fair value hierarchy:

		$1,490,470,515		$1,490,470,515		$1,490,470,515		$1,490,470,515
	Total		Level I		Level II		Level III
At December 31, 2010
Short-Term Investments	$	1,490,470,515	$	1,490,470,515	$	—	$	—
Exchange-Traded Futures Contracts
Foreign Contracts		22,150,000		22,150,000		—		—
United States Contracts		21,810,340		21,810,340		—		—

During the year ended December 31, 2010, there were no significant transfers between Level I and Level II.

The following table summarizes the valuation of USOF’s securities at June 30, 2011 using the fair value hierarchy:

		$1,090,661,139			$1,090,661,139			$1,090,661,139		$1,090,661,139
	Total			Level I			Level II		Level III
At June 30, 2011
Short-Term Investments	$	1,090,661,139		$	1,090,661,139		$	—	$	—
Exchange-Traded Futures Contracts
Foreign Contracts		(32,400,000	)		(32,400,000	)		—		—
United States Contracts		(26,909,100	)		(26,909,100	)		—		—

Fair Value of Derivative Instruments

Fair Value of Derivative Instruments

	December 31, 2010		December 31, 2010		December 31, 2010
Derivatives not Accounted for as Hedging Instruments	Condensed Statement of Financial Condition Location	Fair Value At June 30, 2011		Fair Value At December 31, 2010
Futures - Commodity Contracts	Assets	$	(59,309,100)	$	43,960,340

Effect of Derivative Instruments on the Condensed Statements of Operations

The Effect of Derivative Instruments on the Condensed Statements of Operations

		For the six months ended June 30, 2011					For the six months ended June 30, 2010
Derivatives not Accounted for as Hedging Instruments	Location of Gain or (Loss) on Derivatives Recognized in Income	Realized Gain or (Loss) on Derivatives Recognized in Income		Change in Unrealized Gain or (Loss) Recognized in Income			Realized Gain or (Loss) on Derivatives Recognized in Income			Change in Unrealized Gain or (Loss) Recognized in Income
Futures - Commodity Contracts	Realized gain (loss) on closed positions	$	189,259,000				$	(25,799,460	)
	Change in unrealized loss on open positions			$	(103,269,440	)				$	(181,464,830	)

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Fair Value of Derivative Instruments (Detail) (Futures, Commodity Contracts, Assets, Total, USD $)	Jun. 30, 2011	Dec. 31, 2010
Futures | Commodity Contracts | Assets, Total
Derivatives, Fair Value [Line Items]
Derivatives not Accounted for as Hedging Instruments	$ (59,309,100)	$ 43,960,340

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Condensed Statements of Operations (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$ (16,027,940)	$ (256,875,160)	$ 189,259,000	$ (25,799,460)
Change in unrealized loss on open positions	(137,071,110)	(28,193,580)	(103,269,440)	(181,464,830)
Dividend income	32,303	188,946	148,356	282,769
Interest income	11,054	18,223	20,788	31,094
Other income	76,000	56,000	150,000	108,000
Total income (loss)	(152,979,693)	(284,805,571)	86,308,704	(206,842,427)
Expenses
General Partner management fees (Note 3)	1,784,880	2,201,081	3,918,441	4,463,235
Brokerage commissions	361,481	550,220	843,195	1,018,256
Professional fees	328,067	369,351	652,132	974,256
Other expenses	164,933	398,261	365,271	589,944
Total expenses	2,639,361	3,518,913	5,779,039	7,045,691
Net income (loss)	$ (155,619,054)	$ (288,324,484)	$ 80,529,665	$ (213,888,118)
Net loss per limited partnership unit	(5.21)	(6.45)	(1.54)	(5.02)
Net income (loss) per weighted average limited partnership unit	(3.99)	(5.34)	1.82	(3.99)
Weighted average limited partnership units outstanding	39,032,967	53,975,824	44,175,138	53,566,851

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ORGANIZATION AND BUSINESS - Additional Information (Detail) (USD $)	1 Months Ended
	Apr. 30, 2006 PartnershipUnit	Apr. 10, 2006	Jun. 30, 2011 PartnershipUnit	Dec. 31, 2010	Jun. 30, 2010	Dec. 31, 2009
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets			1,000
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission	17,000,000
Net asset value per unit		$ 67.39	$ 37.43	$ 38.97	$ 34.14	$ 39.16
Number of units issued		200,000
Value of units issued		$ 13,479,000
Number of registered units			1,627,000,000
UNITED STATES | NYMEX Crude Oil Futures CL August 2011 contracts, expiring July 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Contracts			9,104
Foreign | ICE WTI Crude Oil Futures August 2011 contracts, expiring July 2011
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of Contracts			6,000
Creation Baskets
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of units per basket			100,000

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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010
Related Party Transaction [Line Items]
USCF Management Fee	USOF is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.45% per annum of average daily net assets.
Percentage of average daily net assets	0.45%
Ongoing Registration Fees and Other Offering Expenses	$ 23,530	$ 42,850
Licensing fee incurred	213,932	233,206
Licensing Agreements | First $1,000,000,000 of combined asset of the fund
Related Party Transaction [Line Items]
Fee percentage	0.04%
Licensing Agreements | First $1,000,000,000 of combined asset of the fund | Maximum
Related Party Transaction [Line Items]
Combined assets basis for determining fee percentage	1,000,000,000
Licensing Agreements | Combined assets above $1,000,000,000
Related Party Transaction [Line Items]
Fee percentage	0.02%
Licensing Agreements | Combined assets above $1,000,000,000 | Minimum
Related Party Transaction [Line Items]
Combined assets basis for determining fee percentage	1,000,000,000
Future Period
Related Party Transaction [Line Items]
Estimated directors' fees and expenses	540,000
Estimated investor tax reporting cost	$ 1,000,000

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Condensed Statement of Changes in Partners' Capital (Parenthetical)	6 Months Ended
	Jun. 30, 2011
Addition of partnership units	74,100,000
Redemption of partnership units	81,500,000

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FAIR VALUE OF FINANCIAL INSTRUMENTS

6 Months Ended

Jun. 30, 2011

FAIR VALUE OF FINANCIAL INSTRUMENTS

NOTE 7 - FAIR VALUE OF FINANCIAL INSTRUMENTS

USOF values its investments in accordance with Accounting Standards Codification 820 – Fair Value Measurements and Disclosures (“ASC 820”). ASC 820 defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurement. The changes to past practice resulting from the application of ASC 820 relate to the definition of fair value, the methods used to measure fair value, and the expanded disclosures about fair value measurement. ASC 820 establishes a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of USOF (observable inputs) and (2) USOF’s own assumptions about market participant assumptions developed based on the best information available under the circumstances (unobservable inputs). The three levels defined by the ASC 820 hierarchy are as follows:

Level I – Quoted prices (unadjusted) in active markets for identical assets or liabilities that the reporting entity has the ability to access at the measurement date.

Level II – Inputs other than quoted prices included within Level I that are observable for the asset or liability, either directly or indirectly. Level II assets include the following: quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market-corroborated inputs).

Level III – Unobservable pricing input at the measurement date for the asset or liability. Unobservable inputs shall be used to measure fair value to the extent that observable inputs are not available.

In some instances, the inputs used to measure fair value might fall within different levels of the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement in its entirety falls shall be determined based on the lowest input level that is significant to the fair value measurement in its entirety.

The following table summarizes the valuation of USOF’s securities at December 31, 2010 using the fair value hierarchy:

		$1,490,470,515		$1,490,470,515		$1,490,470,515		$1,490,470,515
	Total		Level I		Level II		Level III
At December 31, 2010
Short-Term Investments	$	1,490,470,515	$	1,490,470,515	$	—	$	—
Exchange-Traded Futures Contracts
Foreign Contracts		22,150,000		22,150,000		—		—
United States Contracts		21,810,340		21,810,340		—		—

During the year ended December 31, 2010, there were no significant transfers between Level I and Level II.

The following table summarizes the valuation of USOF’s securities at June 30, 2011 using the fair value hierarchy:

		$1,090,661,139			$1,090,661,139			$1,090,661,139		$1,090,661,139
	Total			Level I			Level II		Level III
At June 30, 2011
Short-Term Investments	$	1,090,661,139		$	1,090,661,139		$	—	$	—
Exchange-Traded Futures Contracts
Foreign Contracts		(32,400,000	)		(32,400,000	)		—		—
United States Contracts		(26,909,100	)		(26,909,100	)		—		—

During the six months ended June 30, 2011, there were no significant transfers between Level I and Level II.

Effective January 1, 2009, USOF adopted the provisions of Accounting Standards Codification 815 - Derivatives and Hedging, which require presentation of qualitative disclosures about objectives and strategies for using derivatives, quantitative disclosures about fair value amounts and gains and losses on derivatives.

Fair Value of Derivative Instruments

	December 31, 2010		December 31, 2010		December 31, 2010
Derivatives not Accounted for as Hedging Instruments	Condensed Statement of Financial Condition Location	Fair Value At June 30, 2011		Fair Value At December 31, 2010
Futures - Commodity Contracts	Assets	$	(59,309,100)	$	43,960,340

The Effect of Derivative Instruments on the Condensed Statements of Operations

		For the six months ended June 30, 2011					For the six months ended June 30, 2010
Derivatives not Accounted for as Hedging Instruments	Location of Gain or (Loss) on Derivatives Recognized in Income	Realized Gain or (Loss) on Derivatives Recognized in Income		Change in Unrealized Gain or (Loss) Recognized in Income			Realized Gain or (Loss) on Derivatives Recognized in Income			Change in Unrealized Gain or (Loss) Recognized in Income
Futures - Commodity Contracts	Realized gain (loss) on closed positions	$	189,259,000				$	(25,799,460	)
	Change in unrealized loss on open positions			$	(103,269,440	)				$	(181,464,830	)

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FINANCIAL HIGHLIGHTS (Tables)

6 Months Ended

Jun. 30, 2011

Per Unit Performance Data and Other Supplemental Financial Data for the Unit Holders

The following table presents per unit performance data and other supplemental financial data for the six months ended June 30, 2011 and 2010 for the unitholders. This information has been derived from information presented in the condensed financial statements.

	For the six months ended June 30, 2011 (Unaudited)			For the six months ended June 30, 2010 (Unaudited)
Per Unit Operating Performance:
Net asset value, beginning of period	$	38.97		$	39.16
Total loss		(1.41	)		(4.89	)
Total expenses		(0.13	)		(0.13	)
Net decrease in net asset value		(1.54	)		(5.02	)
Net asset value, end of period	$	37.43		$	34.14
Total Return		(3.95)	%		(12.82)	%
Ratios to Average Net Assets
Total income (loss)		4.92	%		(10.34)	%
Expenses excluding management fees*		0.21	%		0.26	%
Management fees*		0.45	%		0.45	%
Net income (loss)		4.59	%		(10.69)	%
*  Annualized

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Condensed Statements of Financial Condition (USD $)	Jun. 30, 2011	Dec. 31, 2010
Assets
Cash and cash equivalents (Note 5)	$ 1,252,621,841	$ 1,522,955,092
Equity in UBS Securities LLC trading accounts:
Cash	326,906,415	254,503,610
Unrealized gain (loss) on open commodity futures contracts	(59,309,100)	43,960,340
Dividend receivable	7,655	48,785
Other assets	579,130	573,506
Total assets	1,520,805,941	1,822,041,333
Liabilities and Partners' Capital
Investment payable	1,137
Payable for units redeemed	78,003,657	31,174,128
General Partner management fees payable (Note 3)	506,405	698,317
Brokerage commissions payable	46,186	59,186
Other liabilities	1,131,216	1,502,130
Total liabilities	79,688,601	33,433,761
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital
General Partner
Limited Partners	1,441,117,340	1,788,607,572
Total Partners' Capital	1,441,117,340	1,788,607,572
Total liabilities and partners' capital	$ 1,520,805,941	$ 1,822,041,333
Limited Partners' units outstanding	38,500,000	45,900,000
Net asset value per unit	$ 37.43	$ 38.97
Market value per unit	$ 37.24	$ 39.00