Summary of Significant Accounting Policies (Policy)

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies [Abstract]

(a) Basis of Accounting

The accompanying financial statements of the Fund have been prepared in conformity with U.S. generally accepted accounting principles.

Reclassification

(b) Reclassification

Certain amounts in the prior year have been reclassified to conform to current year presentation.

Use of Estimates

(c) Use of Estimates

The preparation of the financial statements in conformity with U.S. generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and accompanying notes. Actual results could differ from those estimates.

Cash

(d) Cash

Cash, when shown in the Statements of Financial Condition, represents non-segregated cash with the custodian and does not include short term investments.

Segregated Cash Held by Broker

(e) Segregated Cash Held by Broker

The Fund's arrangement with Interactive Brokers, LLC (the "Commodity Broker") requires the Fund to meet its variation margin requirement related to the price movements, both positive and negative, on futures contracts held by the Fund by keeping cash on deposit with the Commodity Broker. These amounts are shown as Cash held by broker in the Statements of Financial Condition. The Fund deposits cash and United States Treasury Obligations with the Commodity Broker subject to Commodity Futures Trading Commission (the "CFTC") regulations and various exchange and broker requirements. The combination of the Fund's deposits with its Commodity Broker of cash and United States Treasury Obligations and the unrealized gain or loss on open futures contracts represents the Fund's overall equity in its brokerage trading account. The Fund uses its cash held by the Commodity Broker to satisfy variation margin requirements. The Fund earns interest on its cash deposited with the Commodity Broker and is recorded on the accrual basis.

Final Net Asset Value for Fiscal Period

(f) Final Net Asset Value for Fiscal Period

The calculation time of the Fund's final net asset value for creation and redemption of fund shares for the Year Ended December 31, 2012 was at 2:30 p.m. Eastern Time.

Although the Fund's shares may continue to trade on secondary markets subsequent to the calculation of the final NAV, the 2:30 p.m. Eastern Time represents the final opportunity to transact in creation or redemption units for the Year Ended December 31, 2012.

Fair value per share is determined at the close of the NYSE Arca and may be later than when the Fund's NAV per share is calculated.

For financial reporting purposes, the Fund values transactions based upon the final closing price in their primary markets. Accordingly, the investment valuations in these financial statements differ from those used in the calculation of the Fund's final creation/redemption NAV at December 31, 2012 and December 31, 2011.

Investment Valuation

(g) Investment Valuation

Short-term investments, excluding U.S. Treasury Bills, are carried at amortized cost, which approximates value. U.S. Treasury Bills are valued as determined by an independent pricing service based on methods which include consideration of: yields or prices of securities of comparable quality, coupon, maturity and type; indications as to values from dealers; and general market conditions.

Futures contracts are generally valued at the last settled price on the applicable exchange on which that futures contract trades.

Financial Instruments are generally valued using independent sources and/or agreements with counterparties or other procedures as determined by the Managing Owner. However, if the price of the underlying Index Futures Contract becomes unavailable with respect to a specific Financial Instrument, the Managing Owner may, in its sole discretion, choose to determine a fair value price as the basis for determining the fair value of such position in a Financial Instrument for such day. Such fair value prices would be generally determined based on available inputs about the current value of the underlying Index Futures Contract and would be based on principles that the Managing Owner deems fair and equitable so long as such principles are consistent with normal industry standards.

Financial Instruments and Fair Value

(h) Financial Instruments and Fair Value

The Fund discloses the fair value of its investments in accordance with the Financial Accounting Standards Board (FASB) fair value measurement and disclosure guidance which requires a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The disclosure requirements establish a fair value hierarchy that distinguishes between: (1) market participant assumptions developed based on market data obtained from sources independent of the Fund (observable inputs); and (2) the Fund'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 disclosure requirements hierarchy are as follows:

Level I: Quoted prices (unadjusted) in active markets for identical assets and 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 inputs 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 in 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.

Fair value measurements also require additional disclosure when the volume and level of activity for the asset or liability have significantly decreased, as well as when circumstances indicate that a transaction is not orderly.

The following tables summarize the valuation of investments at December 31, 2012 and December 31, 2011 using the fair value hierarchy:

December 31, 2012

U.S. Government Treasury Obligations

Short-Term
Investments

Futures Contracts

Total

Level I - Quoted Prices

$1,065,241a

$188,784 b

$1,254,025

Total

$1,065,241

$188,784

$1,254,025

a - Included in Short-term investments in the Statements of Financial Condition.

b - Includes $209,360 in Receivable on open futures contracts and $20,576 in Payable on open futures contracts in the Statements of Financial Condition.

December 31, 2011

U.S. Government Treasury Obligations

Short-Term
Investments

Futures Contracts

Total

Level I - Quoted Prices

$546,008 a

$(87,197) b

$458,811

Total

$546,008

$ (87,197)

$458,811

a - Included in Short-term investments in the Statements of Financial Condition.

b - Included in Payable on open futures contracts in the Statements of Financial Condition.

There were no Level II or Level III type holdings at December 31, 2012 and December 31, 2011 and during the Years Ended December 31, 2012 and December 31, 2011.

During the Years Ended December 31, 2012 and December 31, 2011, there were no significant transfers between Level I and Level II.

The inputs or methodology used for valuing investments are not necessarily an indication of the risk associated with investing in those securities.

Investment Transactions and Related Income

(i) Investment Transactions and Related Income

Investment transactions are recorded on the trade date. All such transactions are recorded on the identified cost basis, with the exception of futures transactions which are recorded on the average cost basis, and marked to market daily. Unrealized appreciation/depreciation on open futures contracts is reflected in the Statements of Financial Condition and the change in the unrealized appreciation/depreciation between periods is reflected in the Statements of Operations. Discounts on short-term securities purchased are accreted daily and reflected as Interest Income in the Statements of Operations.

Federal Income Taxes

(j) Federal Income Taxes

The Fund is registered as a Delaware statutory trust and is treated as a partnership for U.S. federal income tax purposes. Accordingly, the Fund does not expect to incur U.S. federal income tax liability; rather, each beneficial owner is required to take into account their allocable share of the Fund's income, gain, loss, deductions and other items for the Fund's taxable year ending with or within the beneficial owner's taxable year.

Management of the Fund has reviewed the open tax years 2010 to 2012 and major jurisdictions and concluded that there is no tax liability resulting from unrecognized tax benefits relating to uncertain income tax positions taken or expected to be taken in future tax returns. The Fund is also not aware of any tax positions for which it is reasonably possible that the total amounts of unrecognized tax benefits will significantly change in the next twelve months. On an ongoing basis, management will monitor its tax positions taken to determine if adjustments to its conclusions are necessary based on factors including, but not limited to, further implementation of guidance expected from the Financial Accounting Standards Board and on-going analysis of tax law, regulation, and interpretations thereof.

FactorShares 2X: Oil Bull/S&P500 Bear 10-K