RISK FACTORS

Before investors invest in the Shares, they should be aware that there are various risks. Investors should consider carefully the risks described below together with all of the other information included in this Prospectus before they decide to purchase any Shares.

Risks Related to the Funds’ Operations and Management

The Funds are subject to the risks associated with being newly organized, which may adversely affect the operations of the Funds. There is risk that the objectives of the Funds will not be met.

The Funds are newly organized. The success of the Funds will depend on a number of conditions that are beyond the control of the Funds. There is risk that the investment objectives of the Funds will not be met. The Sponsor has not previously managed any publicly offered commodity pool. If the experience of the Sponsor and its principals is not adequate or suitable to manage investment vehicles such as the Funds, the operations of the Funds may be adversely affected.

The Funds have no operating history, and, as a result, investors may not rely on past performance in deciding whether to buy the Shares.

None of the Funds have commenced trading and none have any performance history upon which to evaluate an investor’s investment in the Funds. Although past performance is not necessarily indicative of future results, if the Funds had performance histories, such performance histories might (or might not) provide investors with more information on which to evaluate an investment in a Fund. As none of the Funds have commenced trading or developed any performance history, investors will have to make their decision to invest in a Fund without such information. Likewise, a benchmark may have a limited history which might be indicative of the future results of such benchmark, or of the future performance of each applicable Fund.

Investors cannot be assured of the Sponsor’s continued services, which discontinuance may be detrimental to the Funds.

Investors cannot be assured that the Sponsor will be willing or able to continue to service the Funds for any length of time. If the Sponsor discontinues its activities on behalf of the Funds, the Funds may be adversely affected, as there may be no entity servicing the Funds for a period of time. If the Sponsor’s registrations with the CFTC or memberships in the NFA were revoked or suspended, the Sponsor would no longer be able to provide services and/or to render trading advice to the Funds. As the Funds themselves are not registered with the CFTC in any capacity, if the Sponsor were unable to provide services and/or trading advice to the Funds, the Funds would be unable to pursue their investment objectives unless and until the Sponsor’s ability to provide services and trading advice to the Funds was reinstated or a replacement for the Sponsor as commodity pool operator and/or commodity trading advisor could be found. Such an event could result in termination of the Funds.

Investors may be adversely affected by redemption or purchase orders that are subject to postponement, suspension or rejection under certain circumstances.

The Funds may, in their discretion, suspend the right of creation or redemption or may postpone the redemption or purchase settlement date, for (1) any period during which the NYSE Arca, American Stock Exchange (“AMEX”), New York Stock Exchange (“NYSE”), CME, CBOT, ICE/NYBOT, LME or NYMEX/COMEX is closed, other than for customary holidays or weekends, or when trading is restricted or suspended or restricted on such exchanges in any of the underlying commodities, (2) any period during which an emergency exists as a result of which the fulfillment of a purchase order or the redemption distribution is not reasonably practicable, or (3) such other period as the Sponsor determines to be necessary for the protection of the shareholders of a Fund. In addition, the Funds will reject a redemption order if the order is not in proper form as described in the Authorized Participant Agreement or if the fulfillment of the order, in the opinion of its counsel, might be unlawful. Any such postponement, suspension or rejection could adversely affect

-16-

Table of Contents

a redeeming Authorized Participant. For example, the resulting delay may adversely affect the value of the Authorized Participant’s redemption proceeds if the NAV of the applicable Fund declines during the period of delay. The Funds disclaim any liability for any loss or damage that may result from any such suspension or postponement.

An investor may be adversely affected by lack of independent advisers representing investors.

The Sponsor has consulted with counsel, accountants and other advisers regarding the formation and operation of the Funds. No counsel has been appointed to represent an investor in connection with the offering of the Shares. Accordingly, an investor should consult his, her, or its own legal, tax and financial advisers regarding the desirability of an investment in the Shares of a Fund. Lack of such consultation may lead to an undesirable investment decision with respect to investment in the Shares.

Possibility of termination of the Funds may adversely affect an investor’s portfolio.

The Sponsor may withdraw from the Funds upon 30 days’ notice, which would also cause the Funds to terminate unless a substitute sponsor were obtained. If the Sponsor withdraws, investors who wish to continue to invest in a Fund’s corresponding benchmark through a fund vehicle will have to find another vehicle, and may not be able to find another vehicle that offers the same features as such Fund.

The value of the Shares of each Fund relates directly to the value of, and realized profit or loss from, the Financial Instruments and other assets held by the Fund and fluctuations in the price of these assets could materially adversely affect an investment in the Shares.

With regard to the Commodity Index Funds or the Commodity Funds, several factors may affect the price of a commodity underlying a Commodity Index Fund or a Commodity Fund, and in turn, the Financial Instruments and other assets, if any, owned by such a Fund, including, but not limited to:

-17-

Table of Contents

The impact of changes in the price of a physical commodity will affect investors differently depending upon the Fund in which investors invest. Daily increases in the price of an underlying commodity will negatively impact the daily performance of Shares of an UltraShort Fund and daily decreases in the price of an underlying commodity will negatively impact the daily performance of Shares of an Ultra Fund. For information regarding how the volatility of an index can have a negative effect on performance over time, see “—Price volatility, which is exacerbated by the use of leverage, may possibly cause the total loss of an investor’s investment.”

With regard to the Currency Funds, several factors may affect the value of the foreign currencies or the U.S. Dollar, and in turn, the swap agreements, futures contracts, forward contracts thereof and other assets, if any, owned by a Fund, including, but not limited to:

The impact of changes in the price of a currency will affect investors differently depending upon the Fund in which investors invest. Daily increases in the price of a currency will negatively impact the daily performance of Shares of an UltraShort Fund and daily decreases in the price of a currency will negatively impact the daily performance of Shares of an Ultra Fund. For information regarding how the volatility of an index can have a negative effect on performance over time, see “—Price volatility, which is exacerbated by the use of leverage, may possibly cause the total loss of an investor’s investment.”

The NAV may not always correspond to market price and, as a result, investors may be adversely affected by the creation or redemption of Creation Units at a value that differs from the market price of the Shares.

The NAV per share of the Shares of a Fund will change as fluctuations occur in the market value of the Fund’s portfolio. Investors should be aware that the public trading price of a number of Shares of a Fund otherwise amounting to a Creation Unit may be different from the NAV of an actual Creation Unit ( i.e. , 50,000 individual Shares may trade at a premium over, or a discount to, NAV of a Creation Unit of Shares) and similarly the public trading price per Share of the Fund may be different from the NAV per Share of the Fund. Consequently, an Authorized Participant may be able to create or redeem a Creation Unit of Shares of a Fund at a discount or a premium to the public trading price per Share of the Fund. This price difference may be due, in large part, to the fact that supply and demand forces at work in the secondary trading market for Shares of a Fund are closely related, but not identical, to the same forces influencing the price of an underlying commodity at any point in time. Investors also should note that the size of each Fund in terms of total assets held may change substantially over time and from time-to-time as Creation Units are created and redeemed.

-18-

Table of Contents

Authorized Participants or their clients or customers may have an opportunity to realize a riskless profit if they can purchase a Creation Unit at a discount to the public trading price of the Shares of a Fund or can redeem a Creation Unit at a premium over the public trading price of the Shares of the Fund. The Sponsor expects that the exploitation of such arbitrage opportunities by Authorized Participants and their clients and customers will tend to cause the public trading price to track NAV per Share of the Funds closely over time.

The value of a Share of a Fund may be influenced by nonconcurrent trading hours between the NYSE Arca and the exchange on which the futures contracts or commodities underlying the applicable benchmark are traded. While the Shares of each Fund trade on the NYSE Arca from 9:30 a.m. to 4:00 p.m. (Eastern Time), the futures contracts or commodities underlying a benchmark may be traded during different time frames. Consequently, liquidity in the futures contracts or commodities underlying the applicable benchmark will be reduced after the close of trading at the applicable commodities exchange. As a result, during the time when the NYSE Arca is open and the applicable commodities exchange is closed, trading spreads and the resulting premium or discount on the Shares of a Fund may widen, and, therefore, increase the difference between the price of the Shares of a Fund and the NAV of such Shares.

Using leverage and/or short positions should be considered to be speculative and could result in the total loss of an investor’s investment.

The Funds use leveraged investment techniques in seeking to achieve their respective investment objectives. Leverage should cause a Fund to lose more money in market environments adverse to its daily investment objectives than a Fund that does not employ leverage, which could result in the total loss of an investor’s investment.

Because the Ultra and UltraShort Funds offered hereby include a 200% multiplier, a one-day price movement of 50% or more in a relevant benchmark could result in the total loss of an investor’s investment if that price movement is contrary to the investment objective of the Fund in which an investor has invested. This would be the case with downward one-day price movements in an Ultra Fund, even though the underlying benchmark would always have a value greater than zero. In addition to the leveraged risk in which a one-day 50% upward move in a benchmark underlying an UltraShort Fund would result in the total loss of an investor’s investment, a benchmark could, in theory, rise infinitely in a one-day period, so a bearish swap agreement or short position in related futures or forward contracts would expose an UltraShort Fund to theoretically unlimited liability.

Because liability due to losses will be segregated to either an Ultra Fund or an UltraShort Fund, as applicable, losses to investors in one Ultra Fund from such exposure will not subject investors in the corresponding UltraShort Fund to such exposure, and vice versa.

Fewer representative commodities may result in greater benchmark volatility, which could adversely affect an investment in the Shares.

Each of the benchmark indices for the Commodity Index Funds is concentrated in terms of the number of commodities represented, and some of the sub-indices are highly concentrated in a single commodity. The Commodity Funds and the Currency Funds are concentrated solely on their single benchmark physical commodity or currency. Investors should be aware that other commodities benchmarks are more diversified in terms of both the number and variety of commodities included. Concentration in fewer commodities may result in a greater degree of volatility in a benchmark and the NAV of the Fund which tracks a benchmark under specific market conditions and over time.

Failure of the commodity or the currency markets, as the case may be, to exhibit low to negative correlation to general financial markets will reduce benefits of diversification and may exacerbate losses to an investor’s portfolio.

Historically, returns of the commodity or currency markets, as the case may be, have tended to exhibit low to negative correlation with the returns of other assets such as stocks and bonds. Although commodity or

-19-

Table of Contents

currency futures trading can provide a diversification benefit to investor portfolios because of its low to negative correlation with other financial assets, the fact that a benchmark is not 100% negatively correlated with financial assets such as stocks and bonds means that each respective Fund cannot be expected to be automatically profitable during unfavorable periods for the stock or bond market, or vice versa. If the Shares perform in a manner that correlates with the general financial markets or do not perform successfully, investors will obtain no diversification benefits by investing in the Shares and the Shares may produce no gains to offset their losses from other investments. Furthermore, there is no historical data regarding the correlation of daily rebalanced leveraged and short investments in commodities and/or currencies to other asset classes.

Trading on commodity exchanges outside the United States is not subject to U.S. regulation and may result in different or diminished investor protections.

Some of the Funds’ trading may be conducted on commodity exchanges outside the United States. Trading on such exchanges is not regulated by any United States governmental agency and may involve certain risks not applicable to trading on United States exchanges, including different or diminished investor protections. In trading contracts denominated in currencies other than U.S. Dollars, the Shares are subject to the risk of adverse exchange rate movements between the dollar and the functional currencies of such contracts. Investors could incur substantial losses from trading on foreign exchanges which such investors would not have otherwise been subject had the Funds’ trading been limited to U.S. markets.

An investment in the Shares may be adversely affected by competition from other methods of investing in commodities or currencies.

A Fund constitutes a new, and thus untested, type of investment vehicle. A Fund competes with other financial vehicles, including other commodity or currency pools, as the case may be, hedge funds, traditional debt and equity securities issued by companies in the commodities or currency industry, other securities backed by or linked to such commodities or currency, and direct investments in the underlying commodities or currency or commodity or currency futures contracts. Market and financial conditions, and other conditions beyond the Sponsor’s control, may make it more attractive to invest in other financial vehicles or to invest in such commodities or currencies directly, which could limit the market for the Shares and reduce the liquidity of the Shares.

The presence of “contango” in the market prices of benchmark commodity future contracts will generally adversely affect the value of those Ultra Funds, and the presence of “backwardation” in the market prices of benchmark commodity future contracts will generally adversely affect the value of those UltraShort Funds.

In Funds that hold futures contracts, as the futures contracts near expiration, they are generally replaced by contracts that have a later expiration. Thus, for example, a contract purchased and held in August 2008 may specify an October 2008 expiration. For an Ultra Fund, as that contract nears expiration, it may be replaced by selling the October 2008 contract and purchasing the contract expiring in December 2008. This process is referred to as “rolling”. Rolling may have a positive or negative impact on performance. For example, historically, the prices of crude oil have frequently been higher for contracts with shorter-term expirations than for contracts with longer-term expirations, which is referred to as “backwardation.” In these circumstances, absent other factors, the sale of the October 2008 contract would take place at a price that is higher than the price at which the December 2008 contract is purchased, thereby creating a gain in connection with rolling. While crude oil has historically exhibited consistent periods of backwardation, backwardation will likely not exist in these markets at all times. The presence of contango (rather than backwardation) in crude oil at the time of rolling would be expected to adversely affect the Dow Jones—AIG Crude Oil Sub Index ^SM and thus would adversely affect the value of the ProShares Ultra DJ-AIG Crude Oil, which tracks daily changes in the value of the Dow Jones—AIG Crude Oil Sub Index ^SM, and positively affect the value of the ProShares UltraShort DJ-AIG Crude Oil which tracks daily changes in the value of the Dow Jones—AIG Crude Oil Sub Index ^SM . Similarly, the presence of contango in any other relevant benchmarks and related futures contracts of a given Ultra Fund would adversely affect the value of that Ultra Fund and positively affect the value of an UltraShort Fund.

-20-

Table of Contents

Conversely, gold and silver units historically exhibit “contango” markets rather than backwardation. Contango markets are those in which the prices of contracts are higher in the distant delivery months than in the nearer delivery months due to the costs of long-term storage of a physical commodity prior to delivery or other factors. The presence of backwardation (rather than contango) at the time of rolling in relevant benchmarks of a given UltraShort Fund would be expected to adversely affect the value of that UltraShort Fund which tracks daily changes in the value of the relevant benchmark and positively affect the value of that Ultra Fund which tracks daily changes in the value of the relevant benchmark.

Funds that are designed to track a multiple or inverse multiple of the daily performance of gold or silver bullion (ProShares Ultra Gold, ProShares UltraShort Gold, ProShares Ultra Silver and ProShares UltraShort Silver) will not invest in bullion itself as certain other exchange traded products do. Rather the Funds will use Financial Instruments to gain exposure to these precious metals. Not investing directly in bullion may introduce additional tracking error and these Funds will be subject to the effects of contango and backwardation described above.

Using Financial Instruments such as forwards and futures in an effort to replicate the performance of gold and silver bullion may introduce tracking error to the performance of the Funds. The primary cause of tracking error resulting from not investing directly in bullion is expected to be caused by the need to roll futures or forward contracts as described above and the resulting possibility that contango or backwardation can occur. Gold and silver historically exhibit contango markets during most periods. The existence of historically prevalent contango markets would be expected to adversely affect the Ultra Funds. Alternatively, the existence of backwardated markets in either silver or gold would have an adverse impact on the UltraShort Funds.

The Funds will be subject to counterparty risks, credit risks and other risks associated with swap agreements and forward contracts, which could result in significant losses to the Funds.

Some of the Funds currently contemplate the use of swap agreements and/or forward contracts as a means to achieve their investment objective. These investment vehicles are typically traded on a principal-to-principal basis through dealer markets that are dominated by major money center and investment banks and other institutions and are essentially unregulated by the CFTC. Investors, therefore, do not receive the protection of CFTC regulation or the statutory scheme of the CEA in connection with each Fund’s swap agreements or forward contracts. The markets rely upon the integrity of market participants in lieu of the additional regulation imposed by the CFTC on participants in the futures markets. The lack of regulation in these markets could expose investors to significant losses under certain circumstances including in the event of trading abuses or financial failure by participants.

Unlike in futures contracts, the counterparty to swap agreements or forward contracts is generally a single bank or other financial institution, rather than a clearing organization backed by a group of financial institutions. As a result, a Fund will be subject to credit risk with respect to the amount it expects to receive from counterparties to Financial Instruments entered into as part of that Fund’s principal investment strategy. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, a Fund could suffer significant losses on these contracts and the value of an investor’s investment in a Fund may decline.

A Fund may experience significant delays in obtaining any recovery in a bankruptcy or other reorganization proceeding from a counterparty and a Fund may obtain only limited recovery or may obtain no recovery in such circumstances. The Funds typically enter into transactions with counterparties whose credit rating is investment grade, as determined by a nationally recognized statistical rating organization, or, if unrated, judged by the Sponsor to be of comparable quality.

Swaps or forward contracts have terms that make them less marketable than futures contracts. Swaps or forward contracts are less marketable because they are not traded on an exchange, do not have uniform terms and conditions, and are entered into based upon the creditworthiness of the parties and the availability of credit support, such as collateral, and in general, are not transferable without the consent of the counterparty.

-21-

Table of Contents

Each Fund will seek to track a multiple or inverse multiple of a benchmark on a daily basis at all times even during periods in which the applicable benchmark is flat as well as when a benchmark is moving in a manner which causes a Fund’s NAV to decline, thereby causing losses to such Fund.

The Funds are not actively managed by traditional methods, which typically involve effecting changes in the composition of a portfolio on the basis of judgments relating to economic, financial and market considerations with a view toward obtaining positive results under all market conditions. Rather, the Sponsor will seek to cause the NAV to track, on a daily basis, a benchmark or in the case of the Ultra Funds or the UltraShort Funds a multiple of a Fund’s benchmark at all times, even during periods in which a benchmark is flat or moving in a manner which causes the NAV of the Funds to decline. It is possible to lose money over time when an underlying benchmark is up (down) for the corresponding Ultra (UltraShort) Fund due to the effects of daily rebalancing, volatility and compounding.

Investors who only invest in any one of an Ultra Fund or an UltraShort Fund may not be able to profit if the market value of the underlying benchmark moves against such investment.

An Ultra Fund is expected to rise as a result of any daily upward price movement in its underlying benchmark. An UltraShort Fund is expected to rise as a result of any daily downward price movement in a benchmark.

If the price of a relevant benchmark decreases on a given day, the corresponding UltraShort Fund should generally profit and the Ultra Fund should generally suffer a loss. If the price of a relevant benchmark increases on a given day, the corresponding Ultra Fund should generally profit and the UltraShort Fund should generally suffer a loss. Therefore, the investment experience of investors who plan to invest in any one of the Funds will depend upon selection of the appropriate Fund in light of the price movements of the underlying benchmark. Such selection may become unprofitable in the future if the price of the benchmark changes direction or may even become unprofitable over time regardless of index direction.

Certain investors who decide to invest in any combination of the Ultra Fund Shares or UltraShort Fund Shares relating to the same underlying benchmark may, nevertheless, suffer losses if the investor’s investment mix between the Ultra Fund Shares and the UltraShort Fund Shares is biased in one direction and the market price of the relevant benchmark moves in the opposite direction.

A Fund’s exposure to the commodities or currencies markets may subject the Fund to greater volatility than investments in traditional securities, which may adversely affect an investor’s investment in that Fund.

A Fund’s exposure to the commodities or currencies markets may subject the Fund to greater volatility than investments in traditional securities. The value of commodity-linked financial instruments or currency-linked financial instruments may be affected by changes in overall market movements, commodity or currency benchmark, as the case may be, volatility, changes in interest rates, or factors affecting a particular industry, commodity or currency, such as drought, floods, weather, livestock disease, embargoes, tariffs and international economic political and regulatory developments.

While close tracking of any Fund to its benchmark may be achieved on any single trading day, over time the cumulative percentage increase or decrease in the NAV of the Shares of a Fund may diverge significantly from the cumulative percentage decrease or increase in the relevant benchmark due to a compounding effect.

While the Funds do not expect that their daily returns will deviate adversely from their respective daily investment objectives, several factors may affect their ability to achieve this correlation. Among these factors are: (1) a Fund’s expenses, including fees, transaction costs and the cost of the investment techniques employed by that Fund (such as costs related to the purchase, sale and storage of the commodities or currencies and the cost of leverage, all of which may be embedded in financial instruments used by a Fund); (2) less than all of the commodities in the relevant benchmark index being held by a Commodity Index Fund or its weighting of

-22-

Table of Contents

investment exposure to such commodities being different from that of the relevant benchmark index; (3) an imperfect correlation between the performance of instruments held by a Fund, such as swaps, futures contracts and/or forward contracts, and the performance of the applicable underlying commodities indices, commodities or currencies in the cash market; (4) bid-ask spreads; (5) holding instruments traded in a market that has become illiquid or disrupted; (6) a Fund’s share prices being rounded to the nearest cent; (7) changes to a benchmark index that are not disseminated in advance; (8) the need to conform a Fund’s portfolio holdings to comply with investment restrictions or policies or regulatory or tax law requirements; (9) early and unanticipated closings of the markets on which the holdings of a Fund trade, resulting in the inability of the Fund to execute intended portfolio transactions. While close tracking of any Fund to its benchmark may be achieved on any single trading day, over time the cumulative percentage increase or decrease in the NAV of the Shares of a Fund may diverge significantly from the cumulative percentage decrease or increase in the relevant benchmark (times the stated multiple in the Fund’s objective) due to a compounding effect. The Funds do not seek to achieve their stated investment objective over a period of time greater than one day because mathematical compounding prevents the Funds from achieving such results. In addition, there is a special form of correlation risk that derives from the Ultra and UltraShort Funds’ use and daily rebalancing of leverage, which is that for periods greater than one day, the use and daily rebalancing of leverage tends to cause the performance of a Fund to be either greater than or less than the benchmark performance times the stated multiple in the fund objective, before accounting for fees and fund expenses.

Solely to illustrate this point, each of the three graphs simulates the one year performance of a benchmark compared with the performance of a fund that each day perfectly achieves its investment objective of twice (200%) the daily benchmark returns. The graphs demonstrate that, for periods greater than one day, a leveraged Fund is likely to underperform or overperform (but not match) the benchmark performance times the stated multiple in the fund objective. No representation is being made that any of the benchmarks or the Funds will or are likely to achieve the performance below.

To isolate the impact of leverage, these graphs assume no fund expenses and borrowing/lending rates (to obtain required leverage) of zero percent. If fund expenses were included, the fund’s performance would be lower than that shown. Each of the graphs also assumes a volatility rate of 15%. A benchmark’s volatility rate is a statistical measure of the magnitude of fluctuations in the returns of a benchmark. Other benchmarks to which the Funds are benchmarked have different historical volatility rates; certain of the Funds’ benchmarks’ historical volatility rates are substantially in excess of 15%.

-23-

Table of Contents

Price volatility, which is exacerbated by the use of leverage, may possibly cause the total loss of an investor’s investment.

Swap agreements, futures and forward contracts have a high degree of price variability and are subject to occasional rapid and substantial changes, which will be magnified by the leveraged positions of the Funds. Consequently, investors could lose all or substantially all of their investment in a Fund.

Each of the Funds are “leveraged” funds in the sense that each has an investment objective to match a multiple or inverse multiple of the performance of a benchmark on a given day. These Funds are subject to the correlation risks described in the preceding risk factor. In addition, as described above, there is a special form of correlation risk that derives from these Funds’ use of leverage, which is that for periods greater than one day, the use of leverage tends to cause the performance of an Ultra or UltraShort Fund to be either greater than, or less than, the benchmark performance times the stated multiple in the fund objective.

The fund performance for a leveraged fund can be estimated given certain assumptions. The tables below illustrate the impact of two factors, benchmark volatility and benchmark performance, on a leveraged fund. Benchmark volatility is a statistical measure of the magnitude of fluctuations in the returns of a benchmark and is calculated as the standard deviation of the natural logarithms of one plus the benchmark return (calculated daily), multiplied by the square root of the number of trading days per year (assumed to be 252). The tables show estimated fund returns for a number of combinations of benchmark performance and benchmark volatility over a one year period. Assumptions used in the tables include: a) no fund expenses and b) borrowing/lending rates (to obtain leverage) of zero percent. If fund expenses were included, the fund’s performance would be lower than shown. The first table below shows an example in which a leveraged fund that has an investment objective to

-24-

Table of Contents

correspond to twice (200%) of the daily performance of a benchmark. The leveraged fund could be expected to achieve a 20% return on a yearly basis if the benchmark performance was 10%, absent any costs or the correlation risk or other factors described above. However, as the table shows, with a benchmark volatility of 20%, such a fund would return 16.3%, again absent any costs or other factors described above and in the Prospectus under “Correlation Risk.” In the charts below, shaded areas represent those scenarios where a leveraged fund with the investment objective described will outperform ( i.e. , return more than) the benchmark performance times the stated multiple in the Fund’s investment objective; conversely areas not shaded represent those scenarios where the Fund will underperform ( i.e. , return less than) the benchmark performance times the stated multiple in the Fund’s investment objective.

Estimated Fund Return Over One Year When the Fund Objective is to Seek Daily Results, Before Fees and Expenses and Leverage Costs, that Correspond to Twice (200%) the Daily Performance of a Benchmark.

-25-

Table of Contents

Estimated Fund Return Over One Year When the Fund Objective is to Seek Daily Results, Before Fees and Expenses, that Correspond to Twice (200%) the Inverse of the Daily Performance of a Benchmark.

The foregoing tables are intended to isolate the effect of benchmark volatility and benchmark performance on the return of a leveraged fund. The Funds’ actual returns may be significantly greater or less than the returns shown above as a result of any of the factors discussed above or under the preceding risk factor describing correlation risks.

Fees are charged regardless of profitability and may result in depletion of assets.

Each Fund indirectly is subject to the fees and expenses described herein which are payable irrespective of profitability. Such fees and expenses include asset-based fees of 0.95% per annum of each Fund’s average daily NAV. Additional charges may include other fees as applicable. The Index will reflect the performance of its underlying commodities, including roll costs, without regard to income earned on cash positions.

Possible illiquid markets may exacerbate losses.

Swap agreements and forward contracts may entail breakage costs if terminated prior to the final maturity date and futures positions cannot always be liquidated at the desired price. It is difficult to execute a trade at a specific price when there is a relatively small volume of buy and sell orders in a market. A market disruption, such as when governments may take or be subject to political actions which disrupt the markets in their major commodities exports and imports, can also make it difficult to liquidate a position or find a swap or forward contract counterparty at a reasonable cost.

There can be no assurance that market illiquidity will not cause losses for the Funds. The large size of the positions which the Funds may acquire increases the risk of illiquidity by both making their positions more difficult to liquidate and increasing the losses incurred while trying to do so. Any type of disruption or illiquidity will be exacerbated due to the fact that the Funds only invest in Financial Instruments related to one commodity.

-26-

Table of Contents

Competing claims of intellectual property rights may adversely affect the Funds and an investment in the Shares.

Parties throughout the financial industry could be granted patent applications that would limit the use of methods and systems for creating and administering interests in commodity and currency pools, as well as other elements of the Trust’s exchange-traded funds structure, any or all of which could impede the Funds from achieving their investment objectives.

Although the Sponsor does not anticipate that such filings will adversely impact the Funds, it is impossible to provide definite assurances that no such negative impact will occur. Further, it is not possible to predict whether a patent will issue at all, nor, if a patent is issued, what subject matter it will cover. The Sponsor believes that it has properly licensed or obtained the appropriate consent of all necessary parties with respect to intellectual property rights. However, other third parties may allege ownership as to such rights and may bring an action in asserting their claims. To the extent any action is brought by a third party asserting such rights, the expenses in litigating, negotiating, cross-licensing or otherwise settling such claims may adversely affect the Funds.

Investors may be adversely affected by an overstatement or understatement of the NAV calculation of a Fund due to the valuation method employed when a settlement price is not available on the date of NAV calculation.

Calculating the NAV of each Fund includes, in part, any unrealized profits or losses on open swap agreements, futures or forward contracts. Under normal circumstances, the NAV of each Fund will reflect its corresponding benchmark and therefore, the settlement price of relevant baskets of open futures contracts on the date when the NAV is being calculated. However, if a futures contract traded on an exchange could not be purchased or sold on a day when a Fund is accepting creation and redemption orders (due to the operation of daily limits or other rules of the exchange or otherwise), a Fund may be improperly exposed which could cause it to fail to meet its stated investment objective. Alternatively, the Fund may attempt to calculate the fair value of such instruments. In such a situation, there is a risk that the calculation of the relevant benchmark, and therefore, the NAV of the applicable Fund on such day, may not accurately reflect the realizable market value of the futures contracts underlying such benchmark.

Risks Related to the Funds’ Shares

The lack of active trading markets for the Shares of a Fund may result in losses on investors’ investments at the time of disposition of his, her, or its Shares.

Although the Sponsor anticipates that the Shares of each Fund will be listed and traded on the NYSE Arca, there can be no guarantee that an active trading market for the Shares of any Fund will develop or be maintained. If investors need to sell their Shares at a time when no active market for them exists, the price investors receive for their Shares, assuming that investors are able to sell them, likely will be lower than the price that investors would receive if an active market did exist.

The Shares of each Fund are new securities products and their value could decrease if unanticipated operational or trading problems arise.

The mechanisms and procedures governing the creation, redemption and offering of the Shares have been developed specifically for these securities products. Consequently, there may be unanticipated problems or issues with respect to the mechanics of the operations of the Funds and the trading of the Shares that could have a material adverse effect on an investment in the Shares. In addition, although the Funds are not actively “managed” by traditional methods, to the extent that unanticipated operational or trading problems or issues arise, the Sponsor’s past experience and qualifications may not be suitable for solving these problems or issues.

-27-

Table of Contents

The liquidity of the Shares may also be affected by the withdrawal from participation of Authorized Participants, which could adversely affect the market price of the Shares.

In the event that one or more Authorized Participants which have substantial interests in the Shares withdraw from participation, the liquidity of the Shares will likely decrease, which could adversely affect the market price of the Shares and result in investors incurring a loss on their investment.

Shareholders that are not Authorized Participants may only purchase or sell their Shares in secondary trading markets, and the conditions associated with trading in secondary markets may adversely affect investors’ investment in the Shares.

Only Authorized Participants may create or redeem Creation Units. All other investors that desire to purchase or sell Shares must do so through the NYSE Arca or in other markets, if any, in which the Shares may be traded.

NYSE Arca may halt trading in the Shares of a Fund which would adversely impact investors’ ability to sell Shares.

Trading in Shares of a Fund may be halted due to market conditions or, in light of NYSE Arca rules and procedures, for reasons that, in the view of the NYSE Arca, make trading in Shares of a Fund inadvisable. In addition, trading is subject to trading halts caused by extraordinary market volatility pursuant to “circuit breaker” rules that require trading to be halted for a specified period based on a specified market decline. There can be no assurance that the requirements necessary to maintain the listing of the Shares of a Fund will continue to be met or will remain unchanged. A Fund will be terminated if the Shares are delisted.

Shareholders will not have the protections associated with ownership of shares in an investment company registered under the 1940 Act.

None of the Funds are either registered as an investment company under the 1940 Act or required to register under such Act. Consequently, shareholders will not have the regulatory protections provided to investors in investment companies and regulated investment companies.

Shareholders do not have the rights enjoyed by investors in certain other vehicles and may be adversely affected by a lack of statutory rights and by limited voting and distribution rights.

The Shares have limited voting and distribution rights (for example, shareholders do not have the right to elect directors and the Funds are not required to pay regular distributions, although the Funds may pay distributions at the discretion of the Sponsor).

The value of the Shares will be adversely affected if the Funds are required to indemnify the Trustee or the Sponsor.

Under the Trust Agreement, the Trustee and the Sponsor have the right to be indemnified for any liability or expense incurred without gross negligence or willful misconduct. That means the Sponsor may require the assets of a Fund to be sold in order to cover losses or liability suffered by it or by the Trustee. Any sale of that kind would reduce the NAV of one or more Funds.

Although the Shares of each Fund are limited liability investments, certain circumstances such as bankruptcy of a Fund or indemnification of a Fund by the shareholder will increase a shareholder’s liability.

The Shares of each Fund are limited liability investments; investors may not lose more than the amount that they invest plus any profits recognized on their investment. However, shareholders could be required, as a matter of bankruptcy law, to return to the estate of a Fund any distribution they received at a time when such Fund was in fact insolvent or in violation of its Trust Agreement.

-28-

Table of Contents

A court could potentially conclude that the assets and liabilities of one Fund are not segregated from those of another Fund and thereby potentially exposing assets in one Fund to the liabilities of another Fund.

Each Fund is a separate series of a Delaware statutory trust and not itself a separate legal entity. Section 3804(a) of the Delaware Statutory Trust Act provides that if certain provisions are in the formation and governing documents of a statutory trust organized in series and if separate and distinct records are maintained for any series and the assets associated with that series are held in separate and distinct records (directly or indirectly, including through a nominee or otherwise) and accounted for in such separate and distinct records separately from the other assets of the statutory trust, or any series thereof, then the debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to a particular series are enforceable against the assets of such series only, and not against the assets of the statutory trust generally or any other series thereof and none of the debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to the statutory trust generally or any other series thereof shall be enforceable against the assets of such series. The Sponsor is not aware of any court case that has interpreted Section 3804(a) or provided any guidance as to what is required for compliance. The Sponsor intends to maintain separate and distinct records for each Fund and account for them separately but it is possible a court could conclude that the methods used did not satisfy Section 3804(a) of the Delaware Statutory Trust Act and thus potentially expose assets in one Fund to the liabilities of another Fund.

With respect to the Currency Funds, substantial purchases or sales of a foreign currency by the official sector of the relevant foreign country could adversely affect an investment in the Shares.

The official sector consists of central banks, other governmental agencies and multi-lateral institutions that buy, sell and hold foreign currencies as part of their reserve assets. The official sector holds a significant amount of foreign currencies that can be mobilized in the open market. In the event that future economic, political or social conditions or pressures require members of the official sector to buy or sell their currency simultaneously or in an uncoordinated manner, the demand for the foreign currency might not be sufficient to accommodate the sudden change in the supply of the foreign currency to the market. Consequently, the price of the foreign currency could decline, which would adversely affect an investment in the corresponding Ultra ProShares, or increase, which would adversely affect an investment in the corresponding UltraShort ProShares.

Shareholders of each Fund will be subject to taxation on their share of the Fund’s taxable income, whether or not they receive cash distributions.

Shareholders of each Fund will be subject to United States federal income taxation and, in some cases, state, local, or foreign income taxation on their share of the Fund’s taxable income, whether or not they receive cash distributions from the Fund. Shareholders of a Fund may not receive cash distributions equal to their share of the Fund’s taxable income or even the tax liability that results from such income.

Investors could be adversely affected if items of income, gain, deduction, loss and credit with respect to Shares of a Fund are reallocated in the event that the IRS does not accept the assumptions or conventions used by the Fund in allocating Fund tax items.

U.S. federal income tax rules applicable to partnerships are complex and often difficult to apply to publicly traded partnerships. Each Fund will apply certain assumptions and conventions in an attempt to comply with applicable rules and to report income, gain, deduction, loss and credit to shareholders of a Fund in a manner that reflects shareholders’ beneficial shares of partnership items, but these assumptions and conventions may not be in compliance with all aspects of applicable tax requirements. It is possible that the IRS will successfully assert that the conventions and assumptions used by a Fund do not satisfy the technical requirements of the Code and/or Treasury regulations and could require that items of income, gain, deduction, loss or credit be adjusted or reallocated in a manner that adversely affects investors.

-29-

Table of Contents

Investors could be adversely affected if the current treatment of long-term capital gains under current U.S. federal income tax law is changed or repealed in the future.

Under current law, long-term capital gains are taxed to non-corporate investors at a maximum United States federal income tax rate of 15%. This tax treatment may be adversely affected, changed or repealed by future changes in tax laws at any time and is currently scheduled to expire for tax years beginning after December 31, 2010.

PROSPECTIVE INVESTORS ARE STRONGLY URGED TO CONSULT THEIR OWN TAX ADVISERS AND COUNSEL WITH RESPECT TO THE POSSIBLE TAX CONSEQUENCES TO THEM OF AN INVESTMENT IN THE SHARES OF A FUND; SUCH TAX CONSEQUENCES MAY DIFFER IN RESPECT OF DIFFERENT INVESTORS.

Risks Related to Regulatory Requirements and Potential Legislative Changes

The Funds will be subject to regulatory risk associated with futures contracts that could adversely affect the Funds’ operations and profitability and cause conflicts of interest.

The CFTC and the U.S. commodities exchanges have established limits referred to as “speculative position limits” on the maximum net long or short speculative futures positions that any person may hold or control in derivatives traded on U.S. commodities exchanges. All accounts owned or managed by the commodity trading advisers, their principals and their affiliates will be combined for position limit purposes. Because futures position limits allow a commodity trading advisor and its principals to control only a limited number of contracts in any one commodity, the Sponsor and its principals are potentially subject to a conflict among the interests of all accounts the Sponsor and its principals control which are competing for shares of that limited number of contracts. Although the Sponsor may be able to achieve the same performance results with OTC substitutes for futures contracts, the OTC market may be subject to differing prices, lesser liquidity and greater counterparty credit risks than the regulated U.S. commodities exchanges. The Sponsor may in the future reduce the size of positions that would otherwise be taken for a Fund or not trade in certain markets on behalf of the Funds in order to avoid exceeding such limits. Modification of trades that would otherwise be made by a Fund, if required, could adversely affect the Fund’s operations and profitability. A violation of speculative position limits by the Sponsor could lead to regulatory action materially adverse to a Fund’s prospects for profitability.

It is possible that in the future, the CFTC may propose new rules with respect to such position limits for traders engaged in trading that is neither for speculative nor bona fide hedging purposes in accordance with existing CFTC requirements. Depending on the outcome of any future CFTC rulemaking, the rules concerning position limits may be amended in a manner that is either detrimental or favorable to the Funds. For example, if the amended rules are detrimental to a Fund, the Fund’s ability to issue new Creation Units or to reinvest income in additional commodity futures contracts may be limited to the extent these activities would cause the Fund to exceed the applicable position limits. Limiting the size of the Fund may affect the correlation between the price of the Shares, as traded on the NYSE Arca, and the NAV of the Fund. That is, the inability to create additional Creation Units could result in Shares in the Fund trading at a premium or discount to NAV of the Fund.

In addition, it is possible that the CFTC may propose new rules that would consider futures contracts underlying OTC transactions in calculating position limits. Such a change could alter, perhaps to a material extent, the nature of an investment in the Funds or the ability of the Funds to continue to implement their investment strategies.

Failure of FCMs to segregate assets may increase losses in the Funds.

The CEA requires a clearing broker to segregate all funds received from customers from such broker’s proprietary assets. There is a risk that assets deposited by the Sponsor on behalf of each Fund as margin with the FCM may, in certain circumstances, be used to satisfy losses of other clients of the FCM which cannot be satisfied by such other clients or by the FCM. If the FCM fails to segregate the funds received from the Sponsor,

-30-

Table of Contents

the assets of the Funds might not be fully protected in the event of the FCM’s bankruptcy. Furthermore, in the event of the FCM’s bankruptcy, any Fund Shares could be limited to recovering only a pro rata share of all available funds segregated on behalf of the FCM’s combined customer accounts, even though certain property specifically traceable to a particular Fund was held by the FCM. The FCM may, from time-to-time, have been the subject of certain regulatory and private causes of action.

In the event of a bankruptcy or insolvency of any exchange or a clearing house, a Fund could experience a loss of the funds deposited through its FCM as margin with the exchange or clearing house, a loss of any profits on its open positions on the exchange, and the loss of unrealized profits on its closed positions on the exchange.

Regulatory changes or actions may alter the operations and profitability of the Funds.

Considerable regulatory attention has been focused on non-traditional investment pools which are publicly distributed in the United States. There is a possibility of future regulatory changes altering, perhaps to a material extent, the nature of an investment in the Funds or the ability of the Funds to continue to implement their investment strategies.

The futures markets are subject to comprehensive statutes, regulations, and margin requirements. In addition, the CFTC and the exchanges are authorized to take extraordinary actions in the event of a market emergency, including, for example, the retroactive implementation of speculative position limits or higher margin requirements, the establishment of daily price limits and the suspension of trading. The regulation of swaps and futures transactions in the United States is a rapidly changing area of law and is subject to modification by government and judicial action. The effect of any future regulatory change on the Funds is impossible to predict, but could be substantial and adverse.

Legislative changes are being proposed that could make it more difficult, if not impossible, for the Funds to operate.

In June 2008, the Chairman of the Senate’s government affairs committee unveiled a series of restrictive proposals aimed at financial speculators in commodities. The most severe would prohibit private and public pension funds with more than $500 million in assets from investing in agricultural and energy commodities traded on a U.S. futures exchange, foreign exchange or OTC. A second plan would direct the CFTC to establish total limits on the share of the commodity market held by financial investors. A third proposal would direct the CFTC to impose speculative-position limits on any stakes not related to real hedging activities.

In July 2008, the Senate’s Majority Leader introduced a bill in an effort to curb excessive speculation and increase transparency and accountability in the oil and gas markets. The aim of the bill is also to prevent traders from “gaming” these markets. The bill proposes to increase the resources and authority of the CFTC to detect, prevent and punish price manipulation and excessive speculation of energy commodities. The bill attempts to distinguish legitimate hedge fund trading from all other trading in energy commodities by defining hedge fund trading as transactions that involve the future delivery of an actual physical energy commodity. Any trading that does not involve the physical delivery of an energy commodity would be subject to speculative position limits established by the CFTC. The bill also requires institutional traders that engage in OTC transactions to keep detailed records so that the CFTC can determine if price manipulation or excessive speculation is taking place. If the CFTC determines that such trading has resulted in a major market disturbance, the bill authorizes the CFTC to take remedial action, including the liquidation of OTC contracts. In addition, the bill attempts to increase the transparency of index trading by requiring the CFTC to routinely collect detailed information from index traders and swap dealers. To further reduce speculation, the bill aims to close the so-called London Loophole that appears to permit excessive speculation through unregulated foreign exchanges. On July 25, 2008, the bill was blocked by a vote of the Senate which prevented the bill from being considered on the Senate floor. The Senate is currently considering various amendments which would allow the bill to proceed to a vote at a future date.

-31-

Table of Contents

Another bill aimed at preventing excessive speculation in oil and other futures was introduced by the Chair of the House Committee on Agriculture on July 30, 2008. This bill passed by a vote in the House of Representatives on September 18, 2008 and has been received in the Senate as of September 22, 2008.

If any of these proposals were to be enacted into law in their current form, it could negatively impact the ability of investors to invest in the Funds and, consequently, for the Sponsor to manage the Funds.

On September 18, 2008, the SEC issued an emergency order temporarily prohibiting any person from effecting a short sale in the publicly traded securities of certain financial firms. This temporary ban expired on October 8, 2008, but the SEC has the authority to reinstate the order as they deem necessary.

-32-

Table of Contents

INVESTMENT OBJECTIVES AND PRINCIPAL INVESTMENT STRATEGIES

Investment Objectives

Investment objectives of the “Ultra ProShares”:

Each “Ultra” Fund will seek daily investment results (before fees and expenses) that correspond to twice (200%) the daily performance, whether positive or negative, of its corresponding benchmark. Expenses may include, among other things, costs related to the purchase, sale and storage of commodities or currencies and the cost of leverage, all of which may be embedded in financial instruments used by that Fund. If an “Ultra” Fund is successful in meeting its objective, its value on a given day (before fees and expenses) should gain approximately twice as much on a percentage basis as its corresponding benchmark when the benchmark rises on a given day. Conversely, its value on a given day (before fees and expenses) should lose approximately twice as much on a percentage basis as the corresponding benchmark when the benchmark declines on a given day. An Ultra Fund will acquire long exposure in any one of or combinations of Financial Instruments, including Financial Instruments with respect to the applicable Ultra Fund’s benchmark such that each Ultra Fund has approximately 200% exposure to the corresponding benchmark at the time of the NAV calculation.

Investment objectives of the “UltraShort ProShares”:

Each “UltraShort” Fund will seek daily investment results (before fees and expenses) that correspond to twice (200%) the inverse (opposite) of the daily performance, whether positive or negative, of its corresponding benchmark. Expenses may include, among other things, expenses related to the purchase, sale and storage of commodities or currencies and the cost of leverage, all of which may be embedded in financial instruments used by that Fund. If an “UltraShort” Fund is successful in meeting its objective, its value on a given day (before fees and expenses) should gain approximately twice as much on a percentage basis as its corresponding benchmark when the benchmark falls on a given day. Conversely, its value on a given day (before fees and expenses) should lose approximately twice as much on a percentage basis as the corresponding benchmark when the benchmark rises on a given day. An UltraShort Fund will acquire short exposure in any one of or combinations of Financial Instruments, including Financial Instruments with respect to the applicable UltraShort Fund’s benchmark such that each UltraShort Fund has approximately 200% exposure to the corresponding benchmark at the time of the NAV calculation.

There can be no assurance that any Fund will achieve its investment objective or avoid substantial losses.

The corresponding benchmark for each Fund is listed below:

ProShares Ultra DJ-AIG Commodity and ProShares UltraShort DJ-AIG Commodity : The Dow Jones—AIG Commodity Index ^SM .

ProShares Ultra DJ-AIG Crude Oil and ProShares UltraShort DJ-AIG Crude Oil : The Dow Jones—AIG Crude Oil Sub-Index ^SM .

ProShares Ultra Gold and ProShares UltraShort Gold : the daily performance of gold bullion as measured by the U.S. Dollar p.m. fixing price for delivery in London.

ProShares Ultra Silver and ProShares UltraShort Silver : the daily performance of silver bullion as measured by the U.S. Dollar fixing price for delivery in London.

ProShares Ultra Euro and ProShares UltraShort Euro : the 4:00 p.m. (Eastern Time) spot price of the Euro versus the U.S. Dollar using Euro exchange rate, expressed in terms of U.S. Dollars per unit of foreign currency.

-33-

Table of Contents

ProShares Ultra Yen and ProShares UltraShort Yen : the 4:00 p.m. (Eastern Time) spot price of the Japanese yen versus the U.S.  Dollar using the Japanese yen exchange rate, expressed in terms of U.S. Dollars per unit of foreign currency.

Principal Investment Strategies

In seeking to achieve each Fund’s investment objective, the Sponsor uses a mathematical approach to investing. Using this approach, the Sponsor determines the type, quantity and mix of investment positions that the Sponsor believes in combination should produce daily returns consistent with a Fund’s objective. The Sponsor relies upon a pre-determined model to generate orders that will result in repositioning each Fund’s investments in accordance with their daily investment objectives. It is currently contemplated that each Fund will invest principally in any one of or combinations of Financial Instruments, including swap agreements, futures contracts, options on futures contracts or forward contracts with respect to the applicable Fund’s benchmark to the extent determined appropriate by the Sponsor. Assets of each Fund not invested in Financial Instruments will be invested in cash equivalents (such as shares of money market funds, bank deposits, bank money market accounts, certain variable rate-demand notes and repurchase agreements collateralized by government securities, whether denominated in U.S. or the applicable foreign currency with respect to a Currency Fund) that will serve as collateral for the Financial Instruments.

The Sponsor does not invest the assets of the Funds in Financial Instruments or other assets based on its view of the investment merit of a particular investment, nor does it conduct conventional commodity or currency research or analysis, or forecast market movement or trends, in managing the assets of the Funds. Each Fund seeks to remain fully invested at all times in securities and/or financial instruments that provide exposure to the Fund’s underlying benchmark without regard to market conditions, trends or direction.

For the Commodity Index Funds, a Fund may hold through Financial Instruments a representative sample of the components in the underlying index, which has aggregate characteristics similar to those of the underlying index. This “sampling” process typically involves selecting a representative sample of components in an index principally to enhance liquidity and reduce transaction costs while seeking to maintain high correlation with, and similar aggregate characteristics (e.g., underlying commodities and valuations) to, the underlying index. In addition, a Fund may obtain exposure to components not included in the underlying index, invest in assets that are not included in the underlying index or may overweight or underweight certain components contained in the underlying index.

Swap Agreements

Swap agreements are two-party contracts entered into primarily by institutional investors for a specified period ranging from a day to more than a year. In a standard swap transaction, the parties agree to exchange the returns on a particular predetermined investment, instrument or index in exchange for a fixed or floating rate of return (interest rate leg) in respect of a predetermined notional amount. In the case of futures contracts based indices, such as those used by the Commodity Index Funds, the reference interest rate is zero. The gross returns to be exchanged are calculated with respect to a notional amount and the benchmark returns to which the swap is linked. Swaps are usually entered into on a net basis, that is, the two payment streams are netted out in a cash settlement on the payment date or dates specified in the agreement with the parties receiving or paying, as the case may be, only the net amount of the two payments. In a typical swap agreement entered into by an Ultra Fund, absent fees, transaction costs and interest, the Ultra Fund would be entitled to settlement payments in the event the benchmark increases and would be required to make payments to the swap counterparty in the event the benchmark decreases. In a typical swap agreement entered into by an UltraShort Fund, absent fees, transaction costs and interest, the UltraShort Fund would be required to make payments to the swap counterparty in the event the benchmark increases and would be entitled to settlement payments in the event the benchmark decreases.

Swap agreements involve, to varying degrees, elements of market risk and exposure to loss in excess of the amount which would be reflected on the Statement of Assets and Liabilities. The notional amounts of the

-34-

Table of Contents

agreement reflects the extent of each Ultra Fund’s total investment exposure under the swap agreement. An UltraShort Fund’s exposure is not limited by the notional amount and its exposure is in theory potentially infinite as there is no fixed limit on the increase in any index value. The primary risks associated with the use of swap agreements arise from the imperfect correlation between movements in the notional amount and the price of the underlying investments and the inability of counterparties to perform. Each Fund bears the risk of loss of the net amount, if any, expected to be received under a swap agreement in the event of the default or bankruptcy of a swap counterparty. Each Fund intends to enter into swap agreements only with large, established and well capitalized financial institutions that meet certain credit quality standards and monitoring policies. Each Fund may use various techniques to minimize credit risk including early termination or reset and payment, using different counterparties and limiting the net amount due from any individual counterparty.

Each Fund generally collateralizes swap agreements with cash and/or certain securities. Such collateral is generally held for the benefit of the counterparty in a segregated tri-party account at the custodian to protect the counterparty against non-payment by the Fund. In the event of a default by the counterparty, and the Fund is owed money in the swap transaction, the Fund will seek withdrawal of this collateral from the segregated account and may incur certain costs exercising its right with respect to the collateral. Each Fund remains subject to credit risk with respect to the amount it expects to receive from counterparties, as those amounts are generally not similarly collateralized by the counterparty. If a counterparty becomes bankrupt or otherwise fails to perform its obligations due to financial difficulties, the Fund may experience significant delays in obtaining any recovery in a bankruptcy or other reorganization proceeding and may obtain only limited recovery or may obtain no recovery in such circumstances.

Forward Contracts

A forward contract is a contractual obligation to purchase or sell a specified quantity of a commodity or currency at or before a specified date in the future at a specified price and, therefore, is economically similar to a futures contract. Unlike futures contracts, however, forward contracts are typically traded in the OTC markets and are not standardized contracts. Forward contracts for a given commodity or currency are generally available for various amounts and maturities and are subject to individual negotiation between the parties involved. Moreover, there is generally no direct means of offsetting or closing out a forward contract by taking an offsetting position as one would a futures contract on a U.S. exchange. If a trader desires to close out a forward contract position, he generally will establish an opposite position in the contract but will settle and recognize the profit or loss on both positions simultaneously on the delivery date. Thus, unlike in the futures contract market where a trader who has offset positions will recognize profit or loss immediately, in the forward market a trader with a position that has been offset at a profit will generally not receive such profit until the delivery date, and likewise a trader with a position that has been offset at a loss will generally not have to pay money until the delivery date. In recent years, however, the terms of forward contracts have become more standardized, and in some instances such contracts now provide a right of offset or cash settlement as an alternative to making or taking delivery of the underlying commodity or currency.

The forward markets are largely unregulated. Forward contracts are, in general, not cleared or guaranteed by a third party.

The forward markets provide what has typically been a highly liquid market for foreign exchange trading, and in certain cases the prices quoted for foreign exchange forward contracts may be more favorable than the prices for foreign exchange futures contracts traded on U.S. exchanges. The forward markets are largely unregulated. Forward contracts are, in general, not cleared or guaranteed by a third party. Commercial banks participating in trading foreign exchange forward contracts often do not require margin deposits, but rely upon internal credit limitations and their judgments regarding the creditworthiness of their counterparties. In recent years, however, many OTC market participants in foreign exchange trading have begun to require that their counterparties post margin.

-35-

Table of Contents

Options on Forward Contracts

An option on a forward contract gives the buyer of the option the right, but not the obligation, to take a position at a specified price (the strike price) in the underlying forward contract. Options on forward contracts are individually negotiated between counterparties and are generally traded in the OTC market. Thus, options on forward contracts possess many of the same characteristics of forward contracts relating to offsetting positions and credit risk that are described above.

The buyer of a call option purchases the right, but not the obligation, to purchase the underlying interest at a specified price. The buyer of a put option purchases the right, but not the obligation, to sell the underlying interest at a specified price. The seller of an option is obligated to take a position in the underlying interest opposite the buyer of the option if the option is exercised. Therefore, the seller of a call option must sell the underlying interest to the buyer of the call option if the buyer chooses to exercise the option. Conversely, the seller of a put option must buy the underlying interest from the buyer of the put option if the buyer chooses to exercise the option.

A call option is considered to be in-the-money if the strike price is below the current market price and out-of-the-money if the strike price is above the current market price. A put option, on the other hand, is considered to be in-the-money if the strike price is above the current market price and out-of-the-money if the strike price is below the current market price. Options typically have limited life spans, which are tied to the delivery or settlement date of the underlying interest. Unexercised options on forwards contracts become worthless at the time of expiration.

Losses to the buyer of an option are limited to the amount paid for the option. Sellers of options, however, face risk similar to that of participants in the forwards markets. For example, the seller of a call option is subject to the same risk as a person who initially sold a forward contract, offset only by the amount received by selling the option.

Futures Contracts

A futures contract is a standardized contract traded on, or subject to the rules of, an exchange that calls for the future delivery of a specified quantity and type of a commodity at a specified time and place. Futures contracts are traded on a wide variety of commodities, including bonds, interest rates, agricultural products, stock indices, currencies, energy and metals. The size and length of futures contracts on a particular commodity are identical and are not subject to any negotiation, other than with respect to price and the number of contracts traded between the buyer and seller.

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 difference between the price at which the futures contract is purchased or sold and the price paid for the offsetting sale or purchase, after allowance for brokerage commissions, constitutes the profit or loss to the trader. Some futures contracts, such as stock index contracts and certain commodity futures contracts, settle in cash (reflecting the difference between the contract purchase/sale price and the contract settlement price) rather than by delivery of the underlying commodity.

Options on Futures Contracts

Options on futures contracts operate in a manner similar to options on forward contracts. An option on a futures contract gives the buyer the right, but not the obligation, to take a position at a specified price in the underlying futures contract. Unlike options on forward contracts, however, options on futures contracts are standardized contracts traded on an exchange. Furthermore, in-the-money options on futures contracts on certain exchanges are automatically exercised on their expiration date.

-36-

Table of Contents

Options on Currencies

Options on currencies grant the holder the right, but not the obligation, to buy or sell currency at a specified exchange rate during a specified period of time.

Supplemental Information About Financial Instruments and Commodities Markets

Participants

The two broad classes of persons who trade futures contracts are hedgers and speculators. Financial institutions that manage or deal in commodity and interest rate sensitive instruments, foreign currencies and stocks, and commercial market participants, including farmers and manufacturers, that market or process commodities, and which are exposed to commodity, currency, interest rate and stock market risks, may use the futures markets for hedging. Hedging is a protective procedure designed to minimize losses that may occur due to an adverse movement in the price of the underlying commodity, such as the adverse price movement between the time a farmer or manufacturer enters into a contract to buy or sell a commodity at a certain price and the time he must perform his obligations under the contract. The futures market enables the hedger to transfer the risk of price fluctuations to the speculator. The usual objective of the hedger is to protect the profit that he expects to earn from his operations rather than to profit in his trading. The speculator, on the other hand, risks his capital in an attempt to make profits from price fluctuations in the commodities. Speculators rarely make or take delivery of the commodities underlying their contracts, but rather close out their positions by entering into offsetting purchases or sales of contracts prior to the delivery date. Since the speculator may take either a long or short position in the futures markets, it is possible for him to make profits or incur losses regardless of whether prices go up or down.

U.S. Futures Exchanges

Futures exchanges provide centralized market facilities for trading futures contracts and options (but not forward contracts) in which multiple persons have the ability to execute or trade contracts by accepting bids and offers from multiple participants. Members of, and trades executed on, a particular exchange are subject to the rules of that exchange. Among the principal exchanges in the United States are the Chicago Board of Trade (“CBOT”), the Chicago Mercantile Exchange (“CME”), the NYMEX, and the Intercontinental Exchange (“ICE”)/New York Board of Trade (“NYBOT”).

Each futures exchange in the United States has an associated “clearing house.” Clearing houses provide services designed to transfer credit risk and ensure the integrity of trades. Once trades between members of an exchange have been confirmed or cleared, the clearing house becomes substituted for each buyer and each seller of contracts traded on the exchange and, in effect, becomes the other party to each trader’s open position in the market. Thereafter, each party to a trade looks only to the clearing house for performance. The clearing house generally establishes some sort of security or guarantee fund to which all clearing members of the exchange must contribute. This fund acts as an emergency buffer which is intended to enable the clearing house to meet its obligations with regard to the other side of an insolvent clearing member’s contracts. Furthermore, clearing houses require margin deposits and continuously mark positions to market to provide some assurance that their members will be able to fulfill their contractual obligations. Thus, members effecting futures transactions on an organized exchange do not bear the risk of the insolvency of the party on the opposite side of the trade; their credit risk is limited to the respective solvencies of their commodity broker and the clearing house. The clearing house “guarantee” of performance on open positions does not run to customers. If a member firm goes bankrupt, customers could lose money.

Non-U.S. Futures Exchanges

Foreign futures exchanges differ in certain respects from their U.S. counterparts. Non-U.S. futures exchanges are not subject to regulation by the CFTC. In contrast to U.S. exchanges, certain foreign exchanges are

-37-

Table of Contents

“principals’ markets,” where trades remain the liability of the traders involved, and the exchange or an affiliated clearing house, if any, does not become substituted for any party. Therefore, participants in such markets must often satisfy themselves as to the creditworthiness of their counterparty. Additionally, in the event of the insolvency or bankruptcy of a non-U.S. market or broker, the rights of market participants are likely to be more limited than the rights afforded by the U.S. futures exchanges.

Regulations

Futures exchanges in the United States are subject to regulation under the CEA, by the CFTC, the governmental agency having responsibility for regulation of futures exchanges and trading on those exchanges. (Investors should be aware that no governmental U.S. agency regulates the OTC foreign exchange markets.)

The CFTC has exclusive authority to designate exchanges for the trading of specific futures contracts and options on futures contracts and to prescribe rules and regulations of the marketing of each. The CFTC also regulates the activities of “commodity trading advisors” and “commodity pool operators” and the CFTC has adopted regulations with respect to certain of such persons’ activities. Pursuant to its authority, the CFTC requires a commodity pool operator, such as the Sponsor, to keep accurate, current and orderly records with respect to each pool it operates. The CFTC may suspend, modify or terminate the registration of any registrant for failure to comply with CFTC rules or regulations. Suspension, restriction or termination of the Sponsor’s registration as a commodity pool operator would prevent it, until such time (if any) as such registration were to be reinstated, from managing, and might result in the termination of, the Funds. The CEA gives the CFTC similar authority with respect to the activities of commodity trading advisors, such as the Sponsor, and requires commodity trading advisors to maintain current and accurate records within the United States. If the registration of a Sponsor as a commodity trading advisor were to be terminated, restricted or suspended, the Sponsor would be unable, until such time (if any) as such registration were to be reinstated, to render trading advice to the Funds. The Funds themselves are not registered with the CFTC in any capacity. Therefore, if the Sponsor were unable to provide services and/or trading advice to the Funds, the Funds would be unable to pursue their investment objectives unless and until the Sponsor’s ability to provide services and trading advice to the Funds was reinstated or a replacement for the Sponsor as commodity pool operator and/or commodity trading advisor could be found. Such an event could result in termination of the Funds.

The CEA requires all FCMs to meet and maintain specified fitness and financial requirements, segregate customer funds from proprietary funds and account separately for all customers’ funds and positions, and to maintain specified book and records open to inspection by the staff of the CFTC. See “Risk Factors—Risks Related to Regulatory Requirements and Potential Legislative Changes—Failure of FCMs to segregate assets may increase losses in the Funds.”

The CEA also gives the states certain powers to enforce its provisions and the regulations of the CFTC.

Under certain circumstances, the CEA grants shareholders the right to institute a reparations proceeding before the CFTC against the Sponsor (as a registered commodity pool operator and commodity trading advisor), the FCM, as well as those of their respective employees who are required to be registered under the CEA. Shareholders may also be able to maintain a private right of action for certain violations of the CEA.

Pursuant to authority in the CEA, the NFA has been formed and registered with the CFTC as a registered futures association. At the present time, the NFA is the only self regulatory organization for commodities professionals other than exchanges. As such, the NFA promulgates rules governing the conduct of commodity professionals and disciplines those professionals that do not comply with such standards. The CFTC has delegated to the NFA responsibility for the registration of commodity trading advisors, commodity pool operators, FCMs, introducing brokers and their respective associated persons and floor brokers. The Sponsor is a member of the NFA (the Funds themselves are not required to become members of the NFA). As an NFA

-38-

Table of Contents

member, the Sponsor is subject to NFA standards relating to fair trade practices, financial condition, and consumer protection. The CFTC is prohibited by statute from regulating trading on foreign commodity exchanges and markets.

Recent Legislative Efforts

In June 2008, the Chairman of the Senate’s government affairs committee unveiled a series of restrictive proposals aimed at financial speculators in commodities. The most severe would prohibit private and public pension funds with more than $500 million in assets from investing in agricultural and energy commodities traded on a U.S. futures exchange, foreign exchange or OTC. A second plan would direct the CFTC to establish total limits on the share of the commodity market held by financial investors. A third proposal would direct the CFTC to impose speculative-position limits on any stakes not related to real hedging activities.

In July 2008, the Senate’s Majority Leader introduced a bill in an effort to curb excessive speculation and increase transparency and accountability in the oil and gas markets. The aim of the bill is also to prevent traders from “gaming” these markets. The bill proposes to increase the resources and authority of the CFTC to detect, prevent and punish price manipulation and excessive speculation of energy commodities. The bill attempts to distinguish legitimate hedge fund trading from all other trading in energy commodities by defining hedge fund trading as transactions that involve the future delivery of an actual physical energy commodity. Any trading that does not involve the physical delivery of an energy commodity would be subject to speculative position limits established by the CFTC. The bill also requires institutional traders that engage in OTC transactions to keep detailed records so that the CFTC can determine if price manipulation or excessive speculation is taking place. If the CFTC determines that such trading has resulted in a major market disturbance, the bill authorizes the CFTC to take remedial action, including the liquidation of OTC contracts. In addition, the bill attempts to increase the transparency of index trading by requiring the CFTC to routinely collect detailed information from index traders and swap dealers. To further reduce speculation, the bill aims to close the so-called London Loophole that appears to permit excessive speculation through unregulated foreign exchanges. On July 25, 2008, the bill was blocked by a vote of the Senate which prevented the bill from being considered on the Senate floor. The Senate is currently considering various amendments which would allow the bill to proceed to a vote at a future date.

Another bill aimed at preventing excessive speculation in oil and other futures was introduced by the Chair of the House Committee on Agriculture on July 30, 2008. This bill passed by a vote in the House of Representatives on September 18, 2008 and has been received in the Senate as of September 22, 2008.

On September 18, 2008, the SEC issued an emergency order temporarily prohibiting any person from effecting a short sale in the publicly traded securities of certain financial firms. This temporary ban expired on October 8, 2008, but the SEC has the authority to reinstate the order as they deem necessary.

Daily Limits

Most U.S. futures exchanges (but generally not foreign exchanges or banks or dealers in the cases of forward contracts, swap agreements and options on forward contracts) limit the amount of fluctuation in some futures contract or options on futures contract prices during a single day by regulations. These regulations specify what are referred to as “daily price fluctuation limits” or more commonly “daily limits.” Once the daily limit has been reached in a particular futures interest, no trades may be made at a price beyond that limit.

Margin

“Initial” or “original” margin is the minimum amount of funds that a futures trader must deposit with his commodity broker in order to initiate futures contract trading or to maintain an open position in futures contracts. Maintenance margin is the amount (generally less than initial margin) to which a trader’s account may decline before he must deliver additional margin. A margin deposit is like a cash performance bond. It helps assure the futures trader’s performance of the futures interests which contracts he purchases or sells. The minimum amount of margin required in connection with a particular futures contract is set by the exchange on which such contract is traded and is subject to change at any time during the term of the contract. Futures interests are customarily bought and sold on margins that represent a very small percentage (ranging upward from less than 2%) of the

-39-

Table of Contents

aggregate purchase or sales price of the contract. Because of such low margins, price fluctuations occurring in the futures markets may create profits and losses that are greater, in relation to the amount invested, than are customary in other forms of investments.

Brokerage firms carrying accounts for traders in futures interests contracts may not accept lower, and may require higher, amounts of margin as a matter of policy in order to afford further protection for themselves.

Margin requirements are computed each day by a commodity broker. At the close of each trading day, each open futures interests contract is marked to market, that is, the gain or loss on the position is calculated from the prior day’s close. When the market value of a particular open futures interests contract position changes to a point where the margin on deposit does not satisfy maintenance margin requirements, a margin call is made by the commodity broker. If the margin call is not met within a reasonable time, the broker may close out the trader’s position.

Trading in OTC markets, such as swaps and forward contracts, where no clearing facility is provided, generally does not require margin but generally does require the extension of credit between the counterparties. In such cases, dealers that maintain exposure to the Funds may require the Funds to post collateral or other similar assurance of performance.

-40-

Table of Contents

DESCRIPTION OF THE DOW JONES—AIG COMMODITY INDEX ^SM AND SUB-INDEXES

Overview of the Dow Jones—AIG Family of Indices

The Dow Jones—AIG Commodity Index ^SM (the “Dow Jones—AIG”) is designed to be a highly liquid and diversified benchmark for the commodity futures market. The Dow Jones—AIG is composed of futures contracts on 19 physical commodities. Unlike equities, which entitle the holder to a continuing stake in a corporation, commodity futures contracts specify a delivery date for the underlying physical commodity. In order to avoid delivery and maintain a long futures position, nearby contracts must be sold and contracts that have not yet reached the delivery period must be purchased. This process is known as “rolling” a futures position. The Dow Jones—AIG is a “rolling index” which means that the Dow Jones—AIG Index does not take actual physical possession of the commodities it tracks, rather it purchases futures contracts of a commodity and as the time for the contract becomes due it sells those contracts and purchases new futures contracts that have not yet reached their delivery period.

The Dow Jones—AIG is comprised of commodities in eight different sectors including, petroleum, natural gas, livestock, grains, industrial metals, precious metals, softs and vegetable oils. These eight sectors track futures contracts prices of 19 specific commodities such as natural gas, crude oil, unleaded gasoline, heating oil, live cattle, lean hogs, wheat, corn, soybeans, soybean oil, aluminum, copper, zinc, nickel, gold, silver, sugar, cotton and coffee. The Dow Jones-AIG is designed to minimize concentration in any one commodity or sector. No single commodity may constitute less than 2% or more than 15% of the index. No related group of commodities (e.g., energy, precious metals, livestock or grains) may constitute more than 33% of the index as of the annual reweightings of the components. The Dow Jones—AIG family of indices also includes eight sub-indices that group commodities based on type, as well as single commodity sub-indices representing each of the 19 commodities that are currently tracked by the Dow Jones—AIG.

To determine its component weightings, the Dow Jones—AIG relies primarily on liquidity data, or the relative amount of trading activity of a particular commodity. Liquidity is an important indicator of the value placed on a commodity by financial and physical market participants. The index also relies to a lesser extent on dollar-adjusted production data. The index thus relies on data that is endogenous to the futures markets (liquidity) and exogenous to the futures markets (production) in determining relative weightings. All data used in both the liquidity and production calculations is averaged over a five-year period.

In consultation with the DJ—AIG Commodity Index Advisory Committee, the DJ—AIG Commodity Index Supervisory Committee meets annually to determine the composition of the index in accordance with the rules established in the DJ-AIGCI Handbook. The Supervisory Committee consists of employees of AIG-FP and Dow Jones. DJ—AIG Commodity Index Advisory Committee members are drawn from the academic, financial and legal communities.

The Dow Jones—AIG is composed of commodities traded on U.S. exchanges, with the exception of aluminum, nickel and zinc, which trade on the London Metal Exchange (“LME”). Trading hours for the U.S. commodity exchanges are between 8:00 a.m. and 3:00 p.m. (Eastern Time). The Dow Jones—AIG ER contract trades exclusively on the CBOT’s electronic trading platform. The new Dow Jones—AIG ER futures contract will trade exclusively on the Exchange’s premier electronic trading platform, e-cbot ^® , from 8:15 a.m. – 1:30 p.m. Central Time, Monday through Friday. A daily settlement price for the index is published at approximately 5:00 p.m. (Eastern Time).

The Dow Jones—AIG is designed to provide:

-41-

Table of Contents

Dow Jones—AIG Commodity Index ^SM

The ProShares Ultra DJ-AIG Commodity and the ProShares UltraShort DJ-AIG Commodity are designed to track a multiple or inverse multiple of the daily performance of Dow Jones—AIG Commodity Index ^SM . The Dow Jones-AIG Commodity Index is a proprietary index that AIG Financial Products Corp. (successor to AIG International, Inc.) (“AIG-FP”) developed and that Dow Jones, in conjunction with AIG-FP, calculates. The methodology for determining the composition and weighting of the Index and for calculating its level is subject to modification by the Sponsors any time. Dow Jones disseminates the Index level at least every 15 seconds from 8:00 a.m. to 3:00 p.m. (Eastern Time), and publishes a daily Index level at approximately 5:00 p.m. (Eastern Time), each business day on its website at http://www.djindexes.com and on other major market data vendors.

The Index is re-weighted and rebalanced each year in January on a price-percentage basis. The annual weightings for the Index are determined each year in June or July by AIG-FP and Dow Jones under the supervision of the Dow Jones-AIG Commodity Index Oversight Committee (the “Oversight Committee”), announced after approval by the Committee and implemented the following January.

The Index is designed to track rolling futures positions in a diversified basket of 19 exchange-traded futures contracts on physical commodities. The 19 physical commodities selected for 2008 are natural gas, crude oil, unleaded gasoline, heating oil, live cattle, lean hogs, wheat, corn, soybeans, soybean oil, aluminum, copper, zinc, nickel, gold, silver, sugar, cotton and coffee.

The Index tracks what is known as a rolling futures position, which is a position where, on a periodic basis, futures contracts on physical commodities specifying delivery on a nearby date must be sold and futures contracts on physical commodities that have not yet reached the delivery period must be purchased. An investor with a rolling futures position is able to avoid delivering underlying physical commodities while maintaining exposure to those commodities. The rollover for each Index component occurs over a period of five Dow Jones-AIG business days each month according to a pre-determined schedule. The Index will reflect the performance of its underlying commodities, including roll costs, without regard to income earned on cash positions.

The Dow Jones-AIG Commodity Index is intended to reflect the overall commodity sector. The Index tracks 19 commodities from eight broad sectors such as petroleum, natural gas, livestock, grains, industrial metals, precious metals, softs and vegetable oil. The Index is composed of notional amounts of the futures contracts for each of the Index commodities with the weighting of each commodity broadly based in proportion to historical levels of the world’s production and supplies of such Index commodity. As of the date of this filing, the Dow Jones-AIG Commodity Index is the basis for a listed and traded futures contract on the CBOT. Futures contracts on the Index commodities currently trade on U.S. futures exchanges, with the exception of aluminum, nickel and zinc, which trade on the LME.

-42-

Table of Contents

Dow Jones—AIG Crude Oil Sub-Index ^SM

The ProShares Ultra DJ-AIG Crude Oil and the ProShares UltraShort DJ-AIG Crude Oil are designed to track a multiple or inverse multiple of the daily performance of Dow Jones—AIG Crude Oil Sub-Index ^SM . The Dow Jones-AIG Crude Oil Sub-Index ^SM is intended to reflect the performance of crude oil as measured by the price of nearby futures contracts of sweet, light crude oil traded on the NYMEX, including roll costs, without regard to income earned on cash positions. Crude oil is the world’s most actively traded commodity and may experience significant volatility. The price of crude oil is established by the supply and demand conditions in the global market overall, and more particularly, in the main refining centers of Singapore, Northwest Europe, and the U.S. Gulf Coast. Demand for petroleum products by consumers, as well as agricultural, manufacturing and transportation industries, determines demand for crude oil by refiners. Since the precursors of product demand are linked to economic activity, crude oil demand will tend to reflect economic conditions. However, other factors such as weather also influence product and crude oil demand. The Index will reflect the performance of its underlying commodities, including roll costs, without regard to income earned on cash positions.

Information About the Index Licensor

“Dow Jones,” “AIG ^® ”, Dow Jones—AIG Commodity Index ^SM , Dow Jones—AIG Crude Oil Sub-Index ^SM ,” and DJ-AIG ^SM ” are service marks of Dow Jones & Company, Inc. and American International Group, Inc. (“American International Group”), as the case may be, and have been licensed for use for certain purposes by the Trust (“Licensee”). Dow Jones—AIG Commodity Index ^SM and Dow Jones—AIG Crude Oil Sub-Index ^SM are collectively referred to as the Indexes.

The Funds are not sponsored, endorsed, sold or promoted by Dow Jones & Company, Inc. (“Dow Jones”), American International Group, Inc. (“American International Group”), AIG Financial Products Corp. (“AIG-FP”) or any of their subsidiaries or affiliates. None of Dow Jones, American International Group, AIG-FP or any of their subsidiaries or affiliates makes any representation or warranty, express or implied, to the owners of or counterparts to the Funds or any member of the public regarding the advisability of investing in securities or commodities generally or in the Funds particularly. The only relationship of Dow Jones, American International Group, AIG-FP or any of their subsidiaries or affiliates to the Licensee is the licensing of certain trademarks, trade names and service marks and of the Indexes, which are determined, composed and calculated by Dow Jones in conjunction with AIG-FP without regard to the Licensee or the Funds. Dow Jones and AIG-FP have no obligation to take the needs of the Licensee or the shareholders of the Funds into consideration in determining, composing or calculating the Indexes. None of Dow Jones, American International Group, AIG-FP or any of their respective subsidiaries or affiliates is responsible for or has participated in the determination of the timing of, prices at, or quantities of the shares of the Funds to be issued or in the determination or calculation of the equation by which the shares of the Funds are converted into cash. None of Dow Jones, American International Group, AIG-FP or any of their subsidiaries or affiliates shall have any obligation or liability, including, without limitation, to Fund shareholders, in connection with the administration, marketing or trading of the Funds. In addition, American International Group, AIG-FP and their subsidiaries and affiliates actively trade commodities, commodity indexes and commodity futures (including the Indexes), as well as swaps, options and derivatives which are linked to the performance of such commodities, commodity indexes and commodity futures. It is possible that this trading activity will affect the value of the Dow Jones-AIG Commodity Index ^SM , and Fund shares.

Fund shareholders should not conclude that the inclusion of a futures contract in the Dow Jones-AIG Commodity Index ^SM is any form of investment recommendation of the futures contract or the underlying exchange-traded physical commodity by Dow Jones, American International Group, AIG-FP or any of their subsidiaries or affiliates. The information in this Prospectus regarding the Index components has been derived solely from publicly available documents. None of Dow Jones, American International Group, AIG-FP or any of their subsidiaries or affiliates has made any due diligence inquiries with respect to the Dow Jones-AIG Commodity Index ^SM components in connection with Funds. None of Dow Jones, American International Group,

-43-

Table of Contents

AIG-FP or any of their subsidiaries or affiliates makes any representation that these publicly available documents or any other publicly available information regarding the Index components, including without limitation a description of factors that affect the prices of such components, are accurate or complete.

NONE OF DOW JONES, AMERICAN INTERNATIONAL GROUP, AIG-FP OR ANY OF THEIR SUBSIDIARIES OR AFFILIATES GUARANTEES THE ACCURACY AND/OR THE COMPLETENESS OF THE INDEXES OR ANY DATA INCLUDED THEREIN AND NONE OF DOW JONES, AMERICAN INTERNATIONAL GROUP, AIG-FP OR ANY OF THEIR SUBSIDIARIES OR AFFILIATES SHALL HAVE ANY LIABILITY FOR ANY ERRORS, OMISSIONS, OR INTERRUPTIONS THEREIN. NONE OF DOW JONES, AMERICAN INTERNATIONAL GROUP, AIG-FP OR ANY OF THEIR SUBSIDIARIES OR AFFILIATES MAKES ANY WARRANTY, EXPRESS OR IMPLIED, AS TO RESULTS TO BE OBTAINED BY THE LICENSEE, FUND SHAREHOLDERS, OR ANY OTHER PERSON OR ENTITY FROM THE USE OF THE INDEXES OR ANY DATA INCLUDED THEREIN. NONE OF DOW JONES, AMERICAN INTERNATIONAL GROUP, AIG-FP OR ANY OF THEIR SUBSIDIARIES OR AFFILIATES MAKES ANY EXPRESS OR IMPLIED WARRANTIES, AND EXPRESSLY DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR USE WITH RESPECT TO THE INDEXES OR ANY DATA INCLUDED THEREIN. WITHOUT LIMITING ANY OF THE FOREGOING, IN NO EVENT SHALL DOW JONES, AMERICAN INTERNATIONAL GROUP, AIG-FP OR ANY OF THEIR SUBSIDIARIES OR AFFILIATES HAVE ANY LIABILITY FOR ANY LOST PROFITS OR INDIRECT, PUNITIVE, SPECIAL OR CONSEQUENTIAL DAMAGES OR LOSSES, EVEN IF NOTIFIED OF THE POSSIBILITY THEREOF. THERE ARE NO THIRD PARTY BENEFICIARIES OF ANY AGREEMENTS OR ARRANGEMENTS AMONG DOW JONES, AIG-FP AND THE LICENSEE, OTHER THAN AMERICAN INTERNATIONAL GROUP.

-44-

Table of Contents

DESCRIPTION OF THE COMMODITY BENCHMARKS

Gold

The ProShares Ultra Gold and the ProShares UltraShort Gold are designed to track a multiple or inverse multiple of the daily performance of gold bullion as measured by the U.S. Dollar p.m. fixing price for delivery in London. The Funds will not directly or physically hold the underlying gold, but instead, will seek exposure to gold through the use of Financial Instruments whose value is based on the underlying price of gold to pursue their investment objective. The benchmark price of gold will be the U.S. Dollar price of gold bullion as measured by the London afternoon fixing price per troy ounce of unallocated gold bullion for delivery in London through a member of the London Bullion Market Association, or LBMA, authorized to effect such delivery.

The price of gold is volatile with fluctuations expected to affect the value of the Shares of the Fund. The price movement of gold may be influenced by a variety of factors, including announcements from central banks regarding reserve gold holdings, agreements among central banks, political uncertainties and economic concerns. The gold market is a global marketplace consisting of both OTC transactions and exchange-traded products. The OTC market generally consists of transactions in spot, forwards, options and other derivatives, while exchange-traded transactions consist of futures and options.

A London gold “fix” is conducted each trading day at 3:00 p.m. London time providing reference gold prices for that day’s trading. Many long-term contracts are priced on the basis of the London gold fix and market participants will usually refer to the London gold fix when looking for a basis for valuation. The Sponsor believes that the London fix is the most widely used benchmark for daily gold prices and is quoted by various major market data vendors.

Silver

The ProShares Ultra Silver and the ProShares UltraShort Silver are designed to track a multiple or inverse multiple of the daily performance of silver bullion as measured by the U.S. Dollar fixing price for delivery in London. The Funds will not directly or physically hold the underlying silver, but instead will seek exposure to silver through the use of Financial Instruments whose value is based on the underlying price of silver to pursue their investment objective. The benchmark price of silver will be the U.S. Dollar price of silver bullion as measured by the London fixing price per troy ounce of unallocated silver bullion for delivery in London through a member of the LBMA authorized to effect such delivery.

The price of silver is volatile with fluctuations expected to affect the value of the Shares. The largest industrial users of silver are the photographic, jewelry, and electronic industries and developments in these industries among other factors may influence the price of silver. Like gold, the silver market is a global marketplace consisting of both OTC transactions and exchange-traded products. The OTC market generally consists of transactions in spot, forwards, options and other derivatives, while exchange-traded transactions consist of futures and options.

A London silver “fix” is conducted each trading day at 12:00 p.m. London time providing reference silver prices for that day’s trading. Many long-term contracts are priced on the basis of the London silver fix and market participants will usually refer to the London silver fix when looking for a basis for valuation. The Sponsor believes that the London fix is the most widely used benchmark for daily silver prices and is quoted by various major market data vendors.

-45-

Table of Contents

DESCRIPTION OF THE CURRENCIES BENCHMARKS

The ProShares Ultra Euro, the ProShares Ultra Yen, the ProShares UltraShort Euro and the ProShares UltraShort Yen are designed to track a multiple or inverse multiple of the daily performance of the applicable currency as measured by the U.S. Dollar. These Funds will use the 4:00 p.m. (Eastern Time) spot prices of the Euro and Japanese yen exchange rates as provided by Reuters, expressed in terms of U.S. Dollars per unit of foreign currency, as the basis for the spot prices of the underlying benchmark. A Currency Fund will not necessarily directly or physically hold the underlying currency and may instead seek exposure through the use of Financial Instruments whose value is based on the price of the underlying currency to pursue its investment objective.

Euro

The ProShares Ultra Euro and the ProShares UltraShort Euro are designed to track a multiple or inverse multiple of the daily performance of the Euro spot price versus the U.S. Dollar. These Funds will use the 4:00 p.m. (Eastern Time) Euro exchange rate as provided by Reuters, expressed in terms of U.S. Dollars per unit of foreign currency, as the basis for the underlying benchmark.

In 1998, the European Central Bank in Frankfurt was organized by Austria, Belgium, Finland, France, Germany, Ireland, Italy, Luxembourg, the Netherlands, Portugal and Spain in order to establish a common currency—the Euro. In 2001, Greece joined as the twelfth country adopting the Euro as its national currency. Unlike the U.S. Federal Reserve System, the Bank of Japan and other comparable central banks, the European Central Bank is a central authority that conducts monetary policy for an economic area consisting of many otherwise largely autonomous states.

At its inception on January 1, 1999, the Euro was launched as an electronic currency used by banks, foreign exchange dealers and stock markets. In 2002, the Euro became cash currency for approximately 300 million citizens of 12 European countries. On May 1, 2004, ten additional countries joined the European Union and, subject to meeting rigorous criteria established by the European Central Bank, are expected to adopt the Euro as their national currency some time before 2010. These countries are Cyprus (South), the Czech Republic, Estonia, Hungary, Latvia, Lithuania, Malta, Poland, Slovakia and Slovenia.

According to the Bank for International Settlements Triennial Central Bank Survey of Foreign Exchange and Derivatives Market Activity in April 2007—Final results (the “BIS Survey”), average daily turnover of the U.S. Dollar in the foreign exchange market accounts for approximately 86% of global foreign exchange transactions, which makes it the most-traded currency in the world. The average daily turnover of the Euro in the foreign exchange market accounts for approximately 37% of global foreign exchange transactions, which makes it the second-most-traded currency in the world. The U.S. Dollar/Euro pair has an average daily turnover of approximately $840 billion, which makes it the most-traded currency pair, accounting for approximately 27% of the global foreign exchange transactions.

Although the European countries that have adopted the Euro are members of the European Union, the United Kingdom, Denmark and Sweden are European Union members that have not adopted the Euro as their national currency.

Japanese Yen

The ProShares Ultra Yen and the ProShares UltraShort Yen are designed to track a multiple or inverse multiple of the daily performance of the Yen spot price versus the U.S. Dollar. These Funds will use the 4:00 p.m. (Eastern Time) Yen exchange rate as provided by Reuters, expressed in terms of U.S. Dollars per unit of foreign currency, as the basis for the underlying benchmark.

The Japanese Yen has been the official currency of Japan since 1871. The Bank of Japan has been operating as the central bank of Japan since 1882.

-46-

Table of Contents

As of April 2007 the average daily turnover in the foreign exchange market was approximately $3.2 trillion. The average daily turnover of the Japanese Yen in the foreign exchange market accounts for approximately 16.5% of global foreign exchange transactions, which makes it the third-most-traded currency in the world. The U.S. Dollar/Japanese Yen pair has an average daily turnover of approximately $397 billion, which makes it the second most traded currency pair, accounting for approximately 13% of global foreign exchange transactions.

A portion of the above information was obtained from the BIS Survey information which comes from the Bank for International Settlements and maintains a website at www.bis.org .

-47-

Table of Contents