DBB Invesco DB Base Metals Fund

SUMMARY

This summary of all material information provided in this Prospectus is intended for quick reference only. For ease of reference, any references throughout this Prospectus to various actions taken by each of the Funds or each of the Master Funds are actually actions that the Trust or the Master Trust has taken on behalf of such respective Funds or Master Funds. The remainder of this Prospectus contains more detailed information. You should read the entire Prospectus, including all exhibits to the Prospectus, before deciding to invest in Shares of any Fund. This Prospectus is intended to be used beginning                     , 2008.

The Trust and the Funds; The Master Trust and the Master Funds

Each of the Trust and Master Trust was organized in seven separate series as a Delaware statutory trust rather than as seven separate statutory trusts in order to achieve certain administrative efficiencies. The interests of investors are not adversely affected by the choice of form of organization.

Shares Listed on the Amex

The Shares of each Fund are listed on the Amex under the following symbols:

Secondary market purchases and sales of Shares will be subject to ordinary brokerage commissions and charges.

Purchases and Sales in the Secondary Market on the Amex

The Shares of each Fund trade on the Amex like any other equity security.

Baskets of Shares in each Fund may be created or redeemed only by Authorized Participants. It is expected that Baskets in a Fund will be created when there is sufficient demand for Shares in such Fund that the market price per Share is at a premium to the net asset value per Share. Authorized Participants are expected to sell such Shares, which are listed on the Amex, to the public at prices that are expected to reflect, among other factors, the trading price of the Shares of such Fund on the Amex and the supply of and demand for Shares at the time of sale and are

expected to fall between net asset value and the trading price of the Shares on the Amex at the time of sale. Similarly, it is expected that Baskets in a Fund will be redeemed when the market price per Share of such Fund is at a discount to the net asset value per Share. Retail investors seeking to purchase or sell Shares on any day are expected to effect such transactions in the secondary market, on the Amex, at the market price per Share, rather than in connection with the creation or redemption of Baskets.

The market price of the Shares of a Fund may not be identical to the net asset value per Share, but these valuations are expected to be very close. Investors are able to use the indicative intra-day value per Share to determine if they want to purchase in the secondary market via the Amex. The intra-day indicative value per Share of each Fund is based on the prior day’s final net asset value, adjusted four times per minute throughout the day to reflect the continuous price changes of the Master Fund’s futures positions to provide a continuously updated estimated net asset value per Share.

Retail investors may purchase and sell Shares through traditional brokerage accounts. Purchases or sales of Shares may be subject to customary brokerage commissions. Investors are encouraged to review the terms of their brokerage accounts for applicable charges.

Pricing Information Available on the Amex and Other Sources

The current trading price per Share of each Fund (quoted in U.S. dollars) is published continuously under its ticker symbol as trades occur throughout each trading day on the consolidated tape, Reuters and/or Bloomberg and on the Managing Owner’s website at http://www.dbfunds.db.com , or any successor thereto.

The most recent end-of-day closing level of each Index is published under its own symbol as of the close of business for the Amex each trading day on the consolidated tape, Reuters and/or Bloomberg and on the Managing Owner’s website at http://www.dbfunds.db.com , or any successor thereto. The most recent end-of-day net asset value of each

Fund is published under its own symbol as of the close of business on Reuters and/or Bloomberg and on the Managing Owner’s website at http://www.dbfunds.db.com , or any successor thereto. In addition, the most recent end-of-day net asset value of each Fund is published the following morning on the consolidated tape.

End of Day Index Closing Level Symbols; End-of-Day Net Asset Value Symbols

PowerShares DB Energy Fund . The end-of-day closing level of the DBLCI-OY Energy ER is published under the symbol DBENIX. The end-of-day net asset value of PowerShares DB Energy Fund is published under the symbol DBE.NV.

PowerShares DB Oil Fund. The end-of-day closing level of the DBLCI-OY CL ER is published under the symbol DBOLIX. The end-of-day net asset value of PowerShares DB Oil Fund is published under the symbol DBO.NV.

PowerShares DB Precious Metals Fund. The end-of-day closing level of the DBLCI-OY Precious Metals ER is published under the symbol DBPMIX. The end-of-day net asset value of PowerShares DB Precious Metals Fund is published under the symbol DBP.NV.

PowerShares DB Gold Fund. The end-of-day closing level of the DBLCI-OY GC ER is published under the symbol DGLDIX. The end-of-day net asset value of PowerShares DB Gold Fund is published under the symbol DGL.NV.

PowerShares DB Silver Fund. The end-of-day closing level of the DBLCI-OY SI ER is published under the symbol DBSLIX. The end-of-day net asset value of PowerShares DB Silver Fund is published under the symbol DBS.NV.

PowerShares DB Base Metals Fund. The end-of-day closing level of the DBLCI-OY Industrial Metals ER is published under the symbol DBBMIX. The end-of-day net asset value of PowerShares DB Base Metals Fund is published under the symbol DBB.NV.

PowerShares DB Agriculture Fund. The end-of-day closing level of the DBLCI-OY Agriculture ER is published under the symbol DBAGIX. The end-of-day net asset value of PowerShares DB Agriculture Fund is published under the symbol DBA.NV.

The Managing Owner publishes the net asset value of each Fund and the net asset value per Share of each Fund daily. Additionally, the Index Sponsor publishes the intra-day level of each Index, and the Managing Owner will publish the indicative value per Share of each Fund (quoted in U.S. dollars) once every fifteen seconds throughout each trading day on the consolidated tape, Reuters and/or Bloomberg and on the Managing Owner’s website at http://www.dbfunds.db.com , or any successor thereto. All of the foregoing information is published under the following symbols:

Intra-Day Index Level Symbols and Intra-Day Indicative Values Per Share Symbols

PowerShares DB Energy Fund. The intra-day index level of the DBLCI-OY Energy ER is published under the symbol DBENIX. The intra-day indicative value per Share of PowerShares DB Energy Fund is published under the symbol DBE.IV.

PowerShares DB Oil Fund. The intra-day index level of the DBLCI-OY CL ER is published under the symbol DBOLIX. The intra-day indicative value per Share of PowerShares DB Oil Fund is published under the symbol DBO.IV.

PowerShares DB Precious Metals Fund. The intra-day index level of the DBLCI-OY Precious Metals ER is published under the symbol DBPMIX. The intra-day indicative value per Share of PowerShares DB Precious Metals Fund is published under the symbol DBP.IV.

PowerShares DB Gold Fund. The intra-day index level of the DBLCI-OY GC ER is published under the symbol DGLDIX. The intra-day indicative value per Share of PowerShares DB Gold Fund is published under the symbol DGL.IV.

PowerShares DB Silver Fund. The intra-day index level of the DBLCI-OY SI ER is published

under the symbol DBSLIX. The intra-day indicative value per Share of PowerShares DB Silver Fund is published under the symbol DBS.IV.

PowerShares DB Base Metals Fund. The intra-day index level of the DBLCI-OY Industrial Metals ER is published under the symbol DBBMIX. The intra-day indicative value per Share of PowerShares DB Base Metals Fund is published under the symbol DBB.IV.

PowerShares DB Agriculture Fund. The intra-day index level of the DBLCI-OY Agriculture ER is published under the symbol DBAGIX. The intra-day indicative value per Share of PowerShares DB Agriculture Fund is published under the symbol DBA.IV.

Each Index’s history is also available at https://index.db.com .

The Index Sponsor obtains information for inclusion in, or for use in the calculation of, the Indexes from sources the Index Sponsor considers reliable. None of the Index Sponsor, the Managing Owner, the Funds, the Master Funds or any of their respective affiliates accepts responsibility for or guarantees the accuracy and/or completeness of any of the Indexes or any data included in any of the Indexes.

CUSIP Numbers

The CUSIP number of PowerShares DB Energy Fund is 73936B101.

The CUSIP number of PowerShares DB Oil Fund is 73936B507.

The CUSIP number of PowerShares DB Precious Metals Fund is 73936B200.

The CUSIP number of PowerShares DB Gold Fund is 73936B606.

The CUSIP number of PowerShares DB Silver Fund is 73936B309.

The CUSIP number of PowerShares DB Base Metals Fund is 73936B705.

The CUSIP number of PowerShares DB Agriculture Fund is 73936B408.

The Master-Feeder Structure

Each Fund invests substantially all of its assets in a separate Master Fund in a master-feeder structure. Each Fund holds no investment assets other than Master Fund Units of its corresponding Master Fund. Each Master Fund is wholly-owned by its corresponding Fund and the Managing Owner. Each Share issued by a Fund correlates with a Master Fund Unit issued by such Fund’s corresponding Master Fund and held by such Fund.

Each Fund and its corresponding Master Fund is subject to the approximate fees and expenses in the aggregate amounts per annum set forth in the above table and elsewhere in this Prospectus. Each Fund and its corresponding Master Fund will be successful only if their annual returns from futures trading, plus their annual interest income from their holdings of United States Treasury securities and other high credit quality short-term fixed income securities, exceed these fees and expenses. Because it is expected that interest income will exceed the fees and costs incurred by each Fund and Master Fund at the end of the first twelve months of an investment, the percentage of profit required for each Fund to breakeven at the end of the first twelve months of an investment, by definition, is expected to be 0.00%. Each Master Fund (and, in turn, each Fund) is expected to earn interest income equal to 3.25% per annum, based upon the yield of 3-month U.S. Treasury bills as of January 7, 2008. Therefore, based upon the difference between the current yield of 3-month U.S. Treasury bills and the annual fees and expenses, each Fund is expected to have net income equal to or greater than the approximate amount per annum set forth in the above table, assuming that each Fund does not experience gains or losses from its futures trading.

The Trustee

Wilmington Trust Company, or the Trustee, a Delaware banking corporation, is the sole trustee of the Trust and the Master Trust. The Trustee delegated to the Managing Owner all of the power and authority to manage the business and affairs of the Trust and each Fund and the Master Trust and each Master Fund and has only nominal duties and liabilities to the Trust, the Funds, the Master Trust and the Master Funds.

Investing in the Shares does not insulate Shareholders from certain risks, including price volatility.

Each Fund pursues its investment objective by investing substantially all of its assets in its corresponding Master Fund. Each Master Fund pursues its investment objective by investing in a portfolio of exchange-traded futures on the commodities comprising the corresponding Index.

The Trust is comprised of each of the following Funds, each of which, in turn, intends to reflect the below sectors:

If the Managing Owner determines in its commercially reasonable judgment that it has become impracticable or inefficient for any reason for any Master Fund to gain full or partial exposure to any Index Commodity by investing in a specific futures contract that comprises the applicable Index, such Master Fund may invest in a futures contract referencing the particular Index Commodity other than the specific contract that comprises the applicable Index. The Managing Owner does not expect the use of other contracts to affect in any material respect any Master Fund’s expenses or result in any material tracking error.

The Index Sponsor calculates each Index on both an excess return basis and a total return basis. The excess return basis calculation reflects the change in market value over time, whether positive or negative, of the applicable underlying commodity futures only. The total return basis calculation reflects the sum of the change in market value over time, whether positive or negative, of the applicable underlying commodity futures plus the return on 3-month U.S. Treasury bills. Each Fund and its corresponding Master Fund seeks to track changes, whether positive or negative, in the level of its corresponding Index over time, plus the excess, if any, of its corresponding Master Fund’s interest income from its holdings of United States Treasury and other high credit quality short-term fixed income securities over the expenses of each Fund’s and its corresponding Master Fund’s expenses.

Each Fund will make distributions at the discretion of the Managing Owner. To the extent that a Master Fund’s actual and projected interest income from its holdings of United States Treasury securities and other high credit quality short-term fixed income securities exceeds the actual and projected fees and expenses of such Master Fund and its corresponding Fund, the Managing Owner expects periodically to make distributions of the amount of such excess. The Funds currently do not expect to make distributions with respect to capital gains. Depending on the applicable Fund’s performance for the taxable year and your own tax situation for such year, your income tax liability for the taxable year for your allocable share of such Fund’s net ordinary income or loss and capital gain or loss may exceed any distributions you receive with respect to such year.

The Master Fund’s portfolio also will include United States Treasury securities and other high credit quality short-term fixed income securities for deposit with the Master Fund’s Commodity Broker as margin.

General

The Deutsche Bank Liquid Commodity Index–Optimum Yield Excess Return™, or DBLCI-OYER™, is intended to reflect the changes in market value, positive or negative, in certain sectors of commodities, or an Index. Each Index is (i) calculated on an excess return, or unfunded basis and (ii) rolled in a manner which is aimed at potentially maximizing the roll benefits in backwardated markets and minimizing the losses from rolling in contangoed markets. Each Index is comprised of one or more underlying commodities, or Index Commodities. The composition of Index Commodities with respect to each Index varies according to each specific sector that such Index intends to reflect. Each Index Commodity is assigned a weight, or Index Base Weight, which is intended to reflect the proportion of such Index Commodity relative to each Index.

DBLCI-OY CL ER™, DBLCI-OY GC ER™ and DBLCI-OY SI ER™ are Indexes with a single Index Commodity, or Single Commodity Sector Indexes.

Each Index has been calculated back to a base date, or Base Date. On the Base Date the closing level of each Index, or Closing Level, was 100.

The sponsor of each Index is Deutsche Bank AG London, or Index Sponsor.

Each Index, except each Single Commodity Sector Index, is composed of notional amounts of each of the underlying Index Commodities. Each Single Commodity Sector Index is composed of one underlying Index Commodity. The notional amount of each Index Commodity included in each multi-sector Index is intended to reflect the changes in market value of each such Index Commodity within the specific Index. The Closing Level of each Index is calculated on each business day by the Index Sponsor based on the closing price of the futures

contracts for each of the underlying Index Commodities and the notional amounts of such Index Commodities.

Each Index, excluding each Single Commodity Sector Index, is rebalanced annually in November to ensure that each of the Index Commodities is weighted in the same proportion that such Index Commodities were weighted on the Base Date.

The composition of each Index may be adjusted in the event that the Index Sponsor is not able to calculate the closing prices of the Index Commodities.

Each Index includes provisions for the replacement of futures contracts as they approach maturity. This replacement takes place over a period of time in order to lessen the impact on the market for the futures contracts being replaced. With respect to each Index Commodity, the Master Fund employs a rule-based approach when it ‘rolls’ from one futures contract to another. Rather than select a new futures contract based on a predetermined schedule (e.g., monthly), each Index Commodity rolls to the futures contract which generates the best possible ‘implied roll yield.’ The futures contract with a delivery month within the next thirteen months which generates the best possible implied roll yield will be included in each Index. As a result, each Index Commodity is able to potentially maximize the roll benefits in backwardated markets and minimize the losses from rolling in contangoed markets.

In general, as a futures contract approaches its expiration date, its price will move towards the spot price in a contangoed market. Assuming the spot price does not change, this would result in the futures contract price decreasing and a negative implied roll yield. The opposite is true in a backwardated market. Rolling in a contangoed market will tend to cause a drag on an Index Commodity’s contribution to the Fund’s return while rolling in a backwardated market will tend to cause a push on an Index Commodity’s contribution to the Fund’s return.

The futures contract price for each Index Commodity will be the exchange closing price for such Index Commodity on each weekday when banks in New York, New York are open, or Index Business

Days. If a weekday is not an Exchange Business Day (as defined in the following sentence) but is an Index Business Day, the exchange closing price from the previous Index Business Day will be used for each Index Commodity. “Exchange Business Day” means, in respect of an Index Commodity, a day that is a trading day for such Index Commodity on the relevant exchange (unless either an Index disruption event or force majeure event has occurred).

On the first New York business day, or Verification Date, of each month, each Index Commodity futures contract will be tested in order to determine whether to continue including it in the applicable Index. If the Index Commodity futures contract requires delivery of the underlying commodity in the next month, known as the Delivery Month, a new Index Commodity futures contract will be selected for inclusion in such Index. For example, if the first New York business day is May 1, 2008, and the Delivery Month of the Index Commodity futures contract currently in such Index is June 2008, a new Index Commodity futures contract with a later Delivery Month will be selected.

For each underlying Index Commodity of an Index, the new Index Commodity futures contract selected will be the Index Commodity futures contract with the best possible “implied roll yield” based on the closing price for each eligible Index Commodity futures contract. Eligible Index Commodity futures contracts are any Index Commodity futures contracts having a Delivery Month (i) no sooner than the month after the Delivery Month of the Index Commodity futures contract currently in such Index, and (ii) no later than the 13 ^th month after the Verification Date. For example, if the first New York business day is May 1, 2008 and the Delivery Month of an Index Commodity futures contract currently in an Index is therefore June 2008, the Delivery Month of an eligible new Index Commodity futures contract must be between July 2008 and July 2009. The implied roll yield is then calculated and the futures contract on the Index Commodity with the best possible implied roll yield is then selected. If two futures contracts have the same implied roll yield, the futures contract with the minimum number of months prior to the Delivery Month is selected.

After the futures contract selection, the monthly roll for each Index Commodity subject to a roll in that particular month unwinds the old futures contract and enters a position in the new futures contract. This takes place between the 2 ^nd and 6 ^th Index Business Day of the month.

On each day during the roll period, new notional holdings are calculated. The calculations for the old Index Commodities that are leaving an Index and the new Index Commodities are then calculated.

On all days that are not monthly index roll days, the notional holdings of each Index Commodity future remains constant.

Each Index is re-weighted on an annual basis on the 6 ^th Index Business Day of each November.

The calculation of each Index is expressed as the weighted average return of the Index Commodities.

DBLCI™ and Deutsche Bank Liquid Commodity Index™ are trade marks of the Index Sponsor and are the subject of Community Trade Mark Nos. 3055043 and 3054996. Trade Mark applications in the United States are pending with respect to both the Trust and aspects of each Index. Any use of these marks must be with the consent of or under license from the Index Sponsor. The Fund, Master Fund and the Managing Owner have been licensed to use DBLCI™ and Deutsche Bank Liquid Commodity Index™. The Index Sponsor does not approve, endorse or recommend the Fund, the Master Fund or the Managing Owner.

There can be no assurance that any Fund or Master Fund will achieve its investment objective or avoid substantial losses. The Master Funds have limited performance history. The value of the Shares of each Fund is expected to fluctuate generally in relation to changes in the value of its corresponding Master Fund Units.

Shares of Each Fund Should Track Closely the Value of its Index

The Shares of each Fund are intended to provide investment results that generally correspond to changes, positive or negative, in the levels of the Fund’s corresponding Index, over time.

The value of the Shares of each Fund is expected to fluctuate in relation to changes in the value of its corresponding Master Fund’s portfolio. The market price of the Shares of a Fund may not be identical to the net asset value per Share, but these two valuations are expected to be very close.

Each Master Fund holds a portfolio of long futures contracts on the Index Commodities which comprise its corresponding Index, each of which are traded on various commodity futures markets in the United States and abroad. Each Master Fund also holds cash and United States Treasury securities and other high credit quality short-term fixed income securities for deposit with its Commodity Broker as margin. Each Master Fund’s portfolio is traded with a view to tracking the changes in its corresponding Index over time, whether the Index is rising, falling or flat over any particular period. None of the Master Funds is “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 to obtaining positive results under all market conditions.

The Managing Owner

DB Commodity Services LLC, a Delaware limited liability company, serves as Managing Owner of the Trust and each Fund and the Master Trust and each Master Fund. The Managing Owner was formed on May 23, 2005. The Managing Owner is an affiliate of Deutsche Bank AG. The Managing Owner serves as the commodity pool operator and commodity trading advisor of the Trust and each Fund and the Master Trust and each Master Fund. The Managing Owner and its trading principals have limited experience in operating commodity pools and in managing futures trading accounts. The Managing Owner is registered as a commodity pool operator and commodity trading advisor with the Commodity Futures Trading Commission, or the CFTC, and is a member of the National Futures Association, or the NFA. As a registered commodity pool operator and commodity trading advisor, with respect to both the Trust and each Fund and the Master Trust and each Master Fund, the Managing Owner must comply with various regulatory requirements under the Commodity Exchange Act and the rules and

regulations of the CFTC and the NFA, including investor protection requirements, antifraud prohibitions, disclosure requirements, and reporting and recordkeeping requirements. The Managing Owner is also subject to periodic inspections and audits by the CFTC and NFA.

The Shares are not deposits or other obligations of the Managing Owner, the Trustee or any of their respective subsidiaries or affiliates or any other bank, are not guaranteed by the Managing Owner, the Trustee or any of their respective subsidiaries or affiliates or any other bank and are not insured by the Federal Deposit Insurance Corporation or any other governmental agency. An investment in the Shares of any Fund is speculative and involves a high degree of risk.

The principal office of the Managing Owner is located at 60 Wall Street, New York, New York 10005. The telephone number of the Managing Owner is (212) 250-5883.

Each Master Fund pays the Managing Owner a Management Fee, monthly in arrears, in an amount equal to either:

No separate fee is paid by any Fund. The Management Fee is paid in consideration of the Managing Owner’s commodity futures trading advisory services.

The Commodity Broker

A variety of executing brokers execute futures transactions on behalf of the Master Funds. Such executing brokers give-up all such transactions to Deutsche Bank Securities Inc., a Delaware

corporation, which serves as clearing broker, or Commodity Broker of each of the Master Funds. The Commodity Broker is an affiliate of the Managing Owner. In its capacity as clearing broker, the Commodity Broker executes and clears each Master Fund’s futures transactions and performs certain administrative services for each Master Fund. Deutsche Bank Securities Inc. is registered with the CFTC as a futures commission merchant and is a member of the NFA in such capacity.

Each Master Fund pays to the Commodity Broker all brokerage commissions, including applicable exchange fees, NFA fees, give-up fees, pit brokerage fees and other transaction related fees and expenses charged in connection with trading activities for each Master Fund. On average, total charges paid to the Commodity Broker are expected to be less than $10.00 per round-turn trade, although the Commodity Broker’s brokerage commissions and trading fees are determined on a contract-by-contract basis. The Managing Owner does not expect brokerage commissions and fees to exceed:

in any year, although the actual amount of brokerage commissions and fees in any year or any part of any year may be greater.

A round-turn trade is a completed transaction involving both a purchase and a liquidating sale, or a sale followed by a covering purchase.

The Administrator

The Trust and Master Trust, on behalf of each Fund and each Master Fund, respectively, has appointed The Bank of New York as the administrator, or the Administrator, of each Fund and

each Master Fund and has entered into an Administration Agreement in connection therewith. The Bank of New York serves as custodian, or Custodian, of each Fund and has entered into a Global Custody Agreement, or Custody Agreement, in connection therewith. The Bank of New York serves as the transfer agent, or Transfer Agent, of each Fund and has entered into a Transfer Agency and Service Agreement in connection therewith.

The Bank of New York, a banking corporation organized under the laws of the State of New York with trust powers, has an office at 2 Hanson Place, 12 ^th Floor, Brooklyn, N.Y. 11217. The Bank of New York is subject to supervision by the New York State Banking Department and the Board of Governors of the Federal Reserve System. Information regarding the net asset value of each Fund, creation and redemption transaction fees and the names of the parties that have executed a Participant Agreement may be obtained from The Bank of New York by calling the following number: (718) 315-4412. A copy of the Administration Agreement is available for inspection at The Bank of New York’s trust office identified above.

Pursuant to the Administration Agreement, the Administrator performs or supervises the performance of services necessary for the operation and administration of each Fund and each Master Fund (other than making investment decisions), including receiving and processing orders from Authorized Participants to create and redeem Baskets, net asset value calculations, accounting and other fund administrative services. The Administrator retains, separately for each Fund and each Master Fund, certain financial books and records, including: Basket creation and redemption books and records, Fund and Master Fund accounting records, ledgers with respect to assets, liabilities, capital, income and expenses, the registrar, transfer journals and related details and trading and related documents received from futures commission merchants, c/o The Bank of New York, 2 Hanson Place, 12 ^th Floor, Brooklyn, New York 11217, telephone number (718) 315-4850.

The Administration Agreement will continue in effect from the commencement of trading operations unless terminated on at least 90 days’ prior written notice by either party to the other party.

Notwithstanding the foregoing, the Administrator may terminate the Administration Agreement upon 30 days’ prior written notice if any Fund and/or any Master Fund has materially failed to perform its obligations under the Administration Agreement.

The Administration Agreement provides for the exculpation and indemnification of the Administrator from and against any costs, expenses, damages, liabilities or claims (other than those resulting from the Administrator’s own bad faith, negligence or willful misconduct) which may be imposed on, incurred by or asserted against the Administrator in performing its obligations or duties under the Administration Agreement. Key terms of the Administration Agreement are summarized under the heading “Material Contracts.”

The Administrator’s monthly fees are paid on behalf of each Fund and each Master Fund by the Managing Owner out of the applicable Management Fee.

The Administrator and any of its affiliates may from time-to-time purchase or sell Shares for their own account, as agent for their customers and for accounts over which they exercise investment discretion.

The Administrator also receives a transaction processing fee in connection with orders from Authorized Participants to create or redeem Baskets in the amount of $500 per order. These transaction processing fees are paid indirectly by the Authorized Participants and not by any Fund or any Master Fund.

Each Fund is expected to retain the services of one or more additional service providers to assist with certain tax reporting requirements of each Fund and the Shareholders of each Fund.

ALPS DISTRIBUTORS, INC.

The Trust, on behalf of each Fund, has appointed ALPS Distributors, Inc., or ALPS Distributors, to assist the Managing Owner and the Administrator with certain functions and duties relating to distribution and marketing, including reviewing and approving marketing materials. ALPS Distributors retains all marketing materials separately for each Fund and each Master Fund, at c/o ALPS

Distributors, Inc., 1625 Broadway, Suite 2200, Denver, Colorado 80202; telephone number (303) 623-2577. Investors may contact ALPS Distributors toll-free in the U.S. at (877) 369-4617. The Managing Owner, on behalf of each Fund, has entered into a Distribution Services Agreement with ALPS Distributors. ALPS Distributors is affiliated with ALPS Mutual Fund Services, Inc., a Denver-based outsourcing solution for administration, compliance, fund accounting, legal, marketing, tax administration, transfer agency and shareholder services for open-end, closed-end, hedge and exchange-traded funds, with over 100,000 shareholder accounts and approximately $17 billion in client mutual fund assets under administration. ALPS Distributors provides distribution services to over $170 billion in client assets.

The Managing Owner, out of the relevant Management Fee, pays ALPS Distributors for performing its duties on behalf of each Fund and its corresponding Master Fund and may pay ALPS Distributors additional compensation in consideration of the performance by ALPS Distributors of additional marketing, distribution and ongoing support services to such Fund or its corresponding Master Fund. Such additional services may include, among other services, the development and implementation of a marketing plan and the utilization of ALPS Distributors’ resources, which include an extensive broker database and a network of internal and external wholesalers.

ALPS Distributors, Inc. is the distributor of PowerShares DB Energy Fund, PowerShares DB Oil Fund, PowerShares DB Precious Metals Fund, PowerShares DB Gold Fund, PowerShares DB Silver Fund, PowerShares DB Base Metals Fund and PowerShares DB Agriculture Fund. Certain marketing services may be provided for each Fund by A I M Distributors, Inc. or PowerShares Capital Management, LLC. This assistance includes the licensing of the PowerShares ^® registered service mark to the Managing Owner for use with each Fund. PowerShares ^® is a registered service mark of PowerShares Capital Management LLC. PowerShares Capital Management LLC is not a sponsor or promoter of any of the Funds and has no responsibility for the performance of any of the Funds or the decisions made or actions taken by the Managing Owner.

A I M DISTRIBUTORS, INC.

Through a marketing agreement between the Managing Owner and A I M Distributors, Inc., or AIM Distributors, an affiliate of PowerShares Capital Management LLC, or PowerShares, the Managing Owner, on behalf of each Fund and each Master Fund, has appointed AIM Distributors as a marketing agent. AIM Distributors assists the Managing Owner and the Administrator with certain functions and duties such as providing various educational and marketing activities regarding each Fund, primarily in the secondary trading market, which activities include, but are not limited to, communicating each Fund’s name, characteristics, uses, benefits, and risks, consistent with the prospectus. AIM Distributors will not open or maintain customer accounts or handle orders for the Funds. Investors may contact AIM Distributors toll-free in the U.S. at (800) 983-0903. AIM Distributors is a subsidiary of AMVESCAP PLC. AMVESCAP is a leading independent global investment manager operating under the AIM, INVESCO, AIM Trimark, Invesco Perpetual and Atlantic Trust brands.

The Managing Owner, out of the relevant Management Fee, pays AIM Distributors for performing its duties on behalf of each Fund and its corresponding Master Fund.

Limitation of Liabilities

Although the Managing Owner has unlimited liability for any obligations of each Fund that exceed that Fund’s net assets, your investment in a Fund is part of the assets of that Fund, and it will therefore be subject to the risks of that Fund’s trading only. You cannot lose more than your investment in any Fund, and you will not be subject to the losses or liabilities of any Fund in which you have not invested. We have received an opinion of counsel that each Fund is entitled to the benefits of the limitation on inter-series liability provided under the Delaware Statutory Trust Act. Each Share, when purchased in accordance with the Declaration of Trust, shall, except as otherwise provided by law, be fully-paid and non-assessable.

The debts, liabilities, obligations, claims and expenses of a particular Fund will be enforceable against the assets of that Fund only, and not against

the assets of the Trust generally or the assets of any other Fund or of any Master Fund, and, unless otherwise provided in the Declaration of Trust, none of the debts, liabilities, obligations and expenses incurred, contracted for or otherwise existing with respect to the Trust or Master Trust generally or any other series thereof will be enforceable against the assets of such Fund or Master Fund, as the case may be.

Creation and Redemption of Shares

The Funds create and redeem Shares from time-to-time, but only in one or more Baskets. A Basket is a block of 200,000 Shares. Baskets may be created or redeemed only by Authorized Participants. Except when aggregated in Baskets, the Shares are not redeemable securities. Authorized Participants pay a transaction fee of $500 in connection with each order to create or redeem a Basket. Authorized Participants may sell the Shares included in the Baskets they purchase from the Funds to other investors.

The Master Funds create and redeem Master Fund Units from time-to-time, but only in one or more Master Unit Baskets. A Master Unit Basket is a block of 200,000 Master Fund Units. Master Unit Baskets in a particular Master Fund may be created or redeemed only by its corresponding Fund. Each Master Fund is wholly-owned by its corresponding Fund and the Managing Owner. Each Share issued by its corresponding Fund correlates with a Master Fund Unit issued by its corresponding Master Fund and held by such Fund.

See “Creation and Redemption of Shares” for more details.

Each Master Fund issues Master Fund Units in Master Unit Baskets to its corresponding Fund continuously as of noon, New York time, on the business day immediately following the date on which a valid order to create a Master Unit Basket is accepted by the Master Fund, at the net asset value of 200,000 Master Fund Units as of the closing time of the Amex or the last to close of the exchanges on which the corresponding Master Fund’s futures contracts are traded, whichever is later, on the date that a valid order to create a Master Unit Basket is accepted by the Master Fund. Each Master Fund is wholly-owned by its corresponding Fund and the Managing Owner. Each Share issued by a Fund correlates with a Master Fund Unit issued by its corresponding Master Fund and held by the Fund.

Authorized Participants

Baskets may be created or redeemed only by Authorized Participants. Each Authorized Participant must (1) be a registered broker-dealer or other securities market participant such as a bank or other financial institution which is not required to register as a broker-dealer to engage in securities transactions, (2) be a participant in DTC, and (3) have entered into an agreement with each Fund and the Managing Owner (a Participant Agreement). The Participant Agreement sets forth the procedures for the creation and redemption of Baskets of Shares and for the delivery of cash required for such creations or redemptions. A list of the current Authorized Participants can be obtained from the Administrator. A similar agreement between each Fund and its corresponding Master Fund sets forth the procedures for the creation and redemption of Master Unit Baskets by the Funds. See “Creation and Redemption of Shares” for more details.

Net Asset Value

Net asset value, in respect of any Master Fund, means the total assets of the Master Fund including, but not limited to, all cash and cash equivalents or other debt securities less total liabilities of such Master Fund, each determined on the basis of generally accepted accounting principles in the United States, consistently applied under the accrual method of accounting.

Net asset value per Master Fund Unit, in respect of any Master Fund, is the net asset value of the Master Fund divided by the number of its outstanding Master Fund Units. Because there is a one-to-one correlation between Shares of a Fund and Master Fund Units of its corresponding Master Fund and each Master Fund has assumed all liabilities of its corresponding Fund, the net asset value per Share of any Fund and the net asset value per Master Fund Unit of its corresponding Master Fund is equal.

See “Description of the Shares and the Master Fund Units; The Funds; Certain Material Terms of the Trust Declarations—Net Asset Value” for more details.

Clearance and Settlement

The Shares of each Fund are evidenced by global certificates that the Fund issues to DTC. The Shares of each Fund are available only in book-entry form. Shareholders may hold Shares of any Fund through DTC, if they are participants in DTC, or indirectly through entities that are participants in DTC. The Master Fund Units of each Master Fund are uncertificated and held by its corresponding Fund in book-entry form.

Segregated Accounts/Interest Income

The proceeds of the offering of each Fund are deposited in cash in a segregated account in the name of its corresponding Master Fund at the Commodity Broker (or another eligible financial institution, as applicable) in accordance with CFTC investor protection and segregation requirements. Each Master Fund is credited with 100% of the interest earned on its average net assets on deposit with the Commodity Broker or such other financial institution each week. In an attempt to increase interest income earned, the Managing Owner expects to invest non-margin assets of each Master Fund in United States government securities (which include any security issued or guaranteed as to principal or interest by the United States), or any certificate of deposit for any of the foregoing, including United States Treasury bonds, United States Treasury bills and issues of agencies of the United States government, and certain cash items such as money market funds, certificates of deposit (under nine

months) and time deposits or other instruments permitted by applicable rules and regulations. Currently, the rate of interest expected to be earned by each Master Fund is estimated to be 3.25% per annum, based upon the yield on 3-month U.S. Treasury bills as of January 7, 2008. This interest income is used by each Master Fund to pay its own expenses and the expenses of its corresponding Fund. See “Fees and Expenses” for more details.

[Remainder of page left blank intentionally.]

Breakeven Amounts

The following table estimates the amount of (i) all fees and expenses which are anticipated to be incurred by a new investor in Shares of each Fund during the first twelve months of investment is the following percentage per annum of the net asset value of each Fund, (ii) the current yield earned by each Master Fund on the 3-month U.S. Treasury bills and (iii) the expected annual net income, plus the amount of any commissions charged by the investor’s broker in connection with an investor’s purchase of Shares:

Each Fund and its corresponding Master Fund is subject to the approximate fees and expenses in the aggregate amounts per annum set forth in the above table and elsewhere in this Prospectus. Each Fund and its corresponding Master Fund will be successful only if their annual returns from futures trading, plus their annual interest income from their holdings of United States Treasury securities and other high credit quality short-term fixed income securities, exceed these fees and expenses per annum. Because it is expected that interest income will exceed the fees and costs incurred by each Fund and Master Fund at the end of the first twelve months of an investment, the percentage of profit required for each Fund to breakeven at the end of the first twelve months of an investment, by definition, is expected to be 0.00%. Each Master Fund (and, in turn, each Fund) is expected to earn interest income equal to 3.25% per annum, based upon the yield of 3-month U.S. Treasury bills as of January 7, 2008. Therefore, based upon the difference between the current yield of 3-month U.S. Treasury bills and the annual fees and expenses, each Fund is expected to have net income equal to or greater than the approximate amount per annum set forth in the above table,

assuming that each Fund does not experience gains or losses from its futures trading.

Distributions

Each Fund will make distributions at the discretion of the Managing Owner. To the extent that a Master Fund’s actual and projected interest income from its holdings of United States Treasury securities and other high credit quality short-term fixed income securities exceeds the actual and projected fees and expenses of such Master Fund and its corresponding Fund, the Managing Owner expects periodically to make distributions of the amount of such excess. The Funds currently do not expect to make distributions with respect to capital gains. Depending on the applicable Fund’s performance for the taxable year and your own tax situation for such year, your income tax liability for the taxable year for your allocable share of such Fund’s net ordinary income or loss and capital gain or loss may exceed any distributions you receive with respect to such year.

Fiscal Year

The fiscal year of each Fund and each Master Fund ends on December 31 of each year.

Financial Information

The Funds and the Master Funds have only recently been organized and have limited financial histories.

income, gain, loss, deductions and other items (which includes the Fund’s allocable share of the Master Fund’s income, gain, loss, deduction and other items) for the Fund’s taxable year ending with or within the owner’s taxable year.

Regulated investment companies (“RICs”) that invest in Shares will be treated as owning a proportionate share of the applicable Master Fund’s assets and will take into account their allocable share of such Master Fund’s income, gain and loss when testing compliance with the asset, income and other statutory requirements specifically applicable to them. A Master Fund would be treated as a qualified publicly traded partnership (“qualified PTP”) within the meaning of the Internal Revenue Code of 1986, as amended, or the Code, for purposes of satisfying the qualification requirements specifically applicable to RICs for any taxable year in which such Master Fund realizes sufficient gross income from its commodity futures transactions. Prospective RIC investors should consult a tax adviser regarding the treatment of an investment in a Master Fund to them under current tax rules. See “Material U.S. Federal Income Tax Considerations—Regulated Investment Companies” below.

Additionally, please refer to the “Material U.S. Federal Income Tax Considerations” section below for information on the potential United States federal income tax consequences of the purchase, ownership and disposition of Shares.

“Breakeven Table”

The “Breakeven Table” on the following page indicates the approximate percentage and dollar returns required for the value of an initial $25.00 investment in a Share of each Fund to equal the amount originally invested twelve months after issuance.

The “Breakeven Table,” as presented, is an approximation only. The capitalization of each Fund does not directly affect the level of its charges as a percentage of its net asset value, other than brokerage commissions.

[Remainder of page left blank intentionally.]

Reports to Shareholders

The Managing Owner will furnish you with an annual report of each Fund in which you are invested within 90 calendar days after the end of such Fund’s fiscal year as required by the rules and regulations of the SEC as well as with those reports required by the CFTC and the NFA, including, but not limited to, an annual audited financial statement certified by independent registered public accountants and any other reports required by any other governmental authority that has jurisdiction over the activities of the Funds and the Master Funds. You also will be provided with appropriate information to permit you to file your United States federal and state income tax returns (on a timely basis) with respect to your Shares. Monthly account statements conforming to CFTC and NFA requirements are posted on the Managing Owner’s website at www.dbfunds.db.com . Additional reports may be posted on the Fund’s website in the discretion of the Managing Owner or as required by regulatory authorities.

uncertainties or other factors described in this Prospectus, as a result of new information, future events or changed circumstances or for any other reason after the date of this Prospectus.

THE SHARES ARE SPECULATIVE AND INVOLVE A HIGH DEGREE OF RISK.

Patent Applications Pending

Patent applications directed to the creation and operation of the Trust and aspects of each Index are pending at the United States Patent and Trademark Office.

[Remainder of page left blank intentionally.]

The Risks You Face

You could lose money investing in Shares of any Fund. You should consider carefully the risks described below before making an investment decision. You should also refer to the other information included in this Prospectus.

The Shares of each Fund are designed to reflect as closely as possible the changes, positive or negative, in the level of its corresponding Index, over time, through its corresponding Master Fund’s portfolio of exchange traded futures contracts on its Index Commodities. The value of the Shares of each Fund relates directly to the value of the portfolio of its corresponding Master Fund, less the liabilities (including estimated accrued but unpaid expenses) of the Fund and its corresponding Master Fund. The price of the various Index Commodities may fluctuate widely. Several factors may affect the prices of the Index Commodities, including, but not limited to:

The net asset value per share of the Shares of a Fund will change as fluctuations occur in the market value of the portfolio of its corresponding Master Fund. Investors should be aware that the public trading price of a Basket of Shares of a Fund may be different from the net asset value of a Basket of Shares of the Fund ( i.e. , 200,000 Shares may trade at a premium over, or a discount to, net asset value of a Basket of Shares) and similarly the public trading price per Share of a Fund may be different from the net asset value per Share of the Fund. Consequently, an Authorized Participant may be able to create or redeem a Basket 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 is closely related, but not identical to the same forces influencing the prices of the Index Commodities comprising the Fund’s corresponding Index, trading individually or in the aggregate 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 Baskets are created and redeemed.

Authorized Participants or their clients or customers may have an opportunity to realize a riskless profit if they can purchase a Creation Basket at a discount to the public trading price of the Shares of a Fund or can redeem a Redemption Basket at a premium over the public trading price of the Shares of the Fund. The Managing Owner 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 net asset value per Share of the Funds closely over time.

The value of a Share of a Fund may be influenced by non-concurrent trading hours between the Amex and the various futures exchanges on which the Index Commodities corresponding to such Fund are traded. As a result, during periods when the Amex is open and the futures exchanges on which the Index Commodities are traded is closed, trading spreads and the resulting premium or discount on the

Shares may widen and, therefore, increase the difference between the price of the Shares and the net asset value of the Shares.

CFTC and commodity exchange rules impose speculative position limits on market participants, including certain of the Master Funds, trading in certain agricultural commodities. These position limits prohibit any person from holding a position of more than a specific number of such futures contracts.

The PowerShares DB Agriculture Fund’s Index includes two commodities, corn and wheat, that are subject to speculative position limits imposed by the CFTC and the rules of the Chicago Board of Trade (“CBOT”) on which the corn and wheat futures contracts trade. The CBOT limits are currently for corn futures: 22,000 contracts net all months combined, 13,500 contracts net a single month (other than the spot month), and 600 contracts for a spot month; and for wheat futures: 6,500 contracts net all months combined, 5,000 contracts net a single month (other than a spot month), and 220 to 600 contracts for a spot month based on the month and certified stocks.

It is possible that in the future, the CFTC may propose new rules with respect to position limits in agricultural commodities for traders engaged in indexed-based trading, such as the trading engaged in by the Maser Funds. 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 the DB Agriculture Master Fund, the PowerShares DB Agriculture Fund’s ability to issue new Baskets, or the DB Agriculture Master Fund’s ability to reinvest income in additional corn and wheat futures contracts, may be limited to the extent these activities would cause the Master Fund to exceed the applicable position limits. Limiting the size of the PowerShares DB Agriculture Fund may affect the correlation between the price of the Shares of the PowerShares DB Agriculture Fund, as traded on the Amex, and the net asset value of the PowerShares

DB Agriculture Fund. That is, the inability to create additional Baskets could result in Shares in the PowerShares DB Agriculture Fund trading at a premium or discount to net asset value of the PowerShares DB Agriculture Fund.

It is possible that a Fund’s performance may not fully replicate the changes in the level of the Index to which it corresponds due to disruptions in the markets for the relevant Index Commodities, the imposition of speculative position limits (as discussed in “The Risks You Face—(3) Regulatory and Exchange Position Limits and Other Rules May Restrict the Creation of Baskets of One or More of the Funds and the Operation of its Corresponding Master Fund”, or due to other extraordinary circumstances. In addition, the Funds are not able to replicate exactly the changes in the level of their respective Indexes because the total return generated by their corresponding Master Funds is reduced by expenses and transaction costs, including those incurred in connection with the Master Funds’ trading activities, and increased by interest income from the Master Funds’ holdings of short-term high credit quality fixed income securities. Tracking the applicable Index requires trading of the relevant Master Fund’s portfolio with a view to tracking the Index over time and is dependent upon the skills of the Managing Owner and its trading principals, among other factors.

None of the Master Funds is actively managed by traditional methods. Therefore, if positions in any one or more of its Index Commodities are declining in value, a Master Fund will not close out such positions, except in connection with a change in the composition or weighting of the Index. The Managing Owner will seek to cause the net asset value of each Master Fund to track its Index during periods in which the Index is flat or declining as well as when the Index is rising.

Trading in Shares of a Fund may be halted due to market conditions or, in light of Amex rules and procedures, for reasons that, in the view of the Amex, 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. Any Fund and its corresponding Master Fund will be terminated if its Shares are delisted.

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

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 Master Funds and the trading of the Shares that could have a material adverse effect on an investment in the Shares. In addition, although the Master Funds are not actively “managed” by traditional methods, to the extent that unanticipated operational or trading problems or issues arise, the Managing Owner’s past experience and qualifications may not be suitable for solving these problems or issues.

The Managing Owner was formed to be the managing owner of investment vehicles such as the Funds and the Master Funds and has only a limited history of past performance. The past performances of the Managing Owner’s management in other positions are no indication of its or their ability to manage investment vehicles such as the Funds or the Master Funds. If the experience of the Managing Owner and its principals is not adequate or suitable to manage investment vehicles such as the Funds and the Master Funds, the operations of the Funds and the Master Funds may be adversely affected.

Each Fund and its corresponding Master Fund has a limited performance history upon which to evaluate your investment in each Fund and its corresponding Master Fund. Although past performance is not necessarily indicative of future results, if each Fund and its corresponding Master Fund had a longer performance history, such performance history might (or might not) provide you with more information on which to evaluate an investment in each Fund and its corresponding Master Fund. Likewise, each Index has a limited history which might be indicative of the future Index results, or of the future performance of each applicable Fund or its corresponding Master Fund. Therefore, you will have to make your decision to invest in each Fund on the basis of limited information.

Each of the Indexes is concentrated in terms of the number of commodities represented, and some are highly concentrated in a single commodity. Each of PowerShares DB Energy Fund, PowerShares DB Precious Metals Fund, PowerShares DB Base Metals Fund and PowerShares DB Agriculture Fund are concentrated in 5 or fewer commodities and each of PowerShares DB Oil Fund, PowerShares DB Gold

Fund and PowerShares DB Silver Fund is concentrated in a single commodity. You should be aware that other commodities indexes 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 an Index and the net asset value of the Fund and Master Fund which track the Index under specific market conditions and over time.

Futures contracts have a high degree of price variability and are subject to occasional rapid and substantial changes. Consequently, you could lose all or substantially all of your investment in any Fund.

Although past Index levels are not necessarily indicative of future Index levels, the peak-to-valley drawdown periods that each Index has experienced has been unusually long and has lasted for multi-year drawdown periods. Please see the chart on page 45 for information regarding worst peak-to-valley drawdown periods with respect to each Index.

Because it is expected that each Fund’s performance will track the performance of its underlying Index, a Fund would suffer a continuous drawdown during the period that an Index suffers such a drawdown period, and in turn, the value of your Shares will also suffer.

Each Fund indirectly is subject to the fees and expenses described herein which are payable irrespective of profitability. See “Breakeven Table” on page 19. Consequently, depending upon the performance of each Fund and the interest rate environment, the expenses of the Master Fund corresponding to a Fund could, over time, result in losses to your investment in the Fund. You may never achieve profits, significant or otherwise by investing in a Fund.

You cannot be assured that the Managing Owner will be willing or able to continue to service the Funds and the Master Funds for any length of time. If the Managing Owner discontinues its activities on behalf of the Funds and the Master Funds, the Funds and the Master Funds may be adversely affected.

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 foreign governments may take or be subject to political actions which disrupt the markets in their currency or major exports, can also make it difficult to liquidate a position.

There can be no assurance that market illiquidity will not cause losses for the Funds. The large size of the positions which the Master Funds may acquire on behalf of the Funds increases the risk of illiquidity by both making its positions more difficult to liquidate and increasing the losses incurred while trying to do so.

The Funds may, in their discretion, suspend the right of redemption or postpone the redemption settlement date, (1) for any period during which an emergency exists as a result of which the redemption distribution is not reasonably practicable, or (2) for such other period as the Managing Owner 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 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 a redeeming Authorized Participant. For example, the resulting delay may adversely affect the value of the Authorized Participant’s redemption proceeds if the net asset value 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.

Futures trading is a risk transfer economic activity. For every gain there is an equal and offsetting loss rather than an opportunity to participate over time in general economic growth. Unlike most alternative investments, an investment in Shares of a Fund does not involve acquiring any asset with intrinsic value. Overall stock and bond prices could rise significantly and the economy as a whole prosper while Shares of a Fund trade unprofitably.

Historically, commodity futures’ returns have tended to exhibit low to negative correlation with the returns of other assets such as stocks and bonds. Although commodity futures trading can provide a diversification benefit to investor portfolios because of its low to negative correlation with other financial assets, the fact that the Index 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, you will obtain no diversification benefits by investing in the Shares and the Shares may produce no gains to offset your losses from other investments.

None of the Funds or the Master Funds is registered as an investment company under the Investment Company Act of 1940, and none of them is required to register under such act. Consequently,

Shareholders will not have the regulatory protections provided to investors in registered and regulated investment companies.

The Funds and the Master Funds are subject to actual and potential conflicts of interest involving the Managing Owner, various commodity futures brokers and Authorized Participants. The Managing Owner and its principals, all of whom are engaged in other investment activities, are not required to devote substantially all of their time to the business of the Funds and the Master Funds, which also presents the potential for numerous conflicts of interest with the Funds and the Master Funds. As a result of these and other relationships, parties involved with the Funds and the Master Funds have a financial incentive to act in a manner other than in the best interests of the Funds, the Master Funds and the Shareholders. The Managing Owner has not established any formal procedure to resolve conflicts of interest. Consequently, investors are dependent on the good faith of the respective parties subject to such conflicts to resolve them equitably. Although the Managing Owner attempts to monitor these conflicts, it is extremely difficult, if not impossible, for the Managing Owner to ensure that these conflicts do not, in fact, result in adverse consequences to the Shareholders.

The Funds and the Master Funds may be subject to certain conflicts with respect to the Commodity Broker, including, but not limited to, conflicts that result from receiving greater amounts of compensation from other clients, or purchasing opposite or competing positions on behalf of third party accounts traded through the Commodity Broker.

Shareholders of each Fund will be subject to U.S. federal income taxation and, in some cases, state, local, or foreign income taxation on their share of the Fund’s taxable income (including the corresponding Master Fund’s taxable income

allocable to their Fund), 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 (including the corresponding Master Fund’s taxable income) or even the tax liability that results from such income.

U.S. federal income tax rules applicable to partnerships are complex and often difficult to apply to publicly traded partnerships. Each Fund and Master 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 its corresponding 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 or a Master 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 you.

Under current law, long-term capital gains are taxed to noncorporate investors at a maximum U.S. 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 ANY

FUND; SUCH TAX CONSEQUENCES MAY DIFFER IN RESPECT OF DIFFERENT INVESTORS.

The Commodity Exchange Act requires a clearing broker to segregate all funds received from customers from such broker’s proprietary assets. If the Commodity Broker fails to do so, the assets of the Master Funds might not be fully protected in the event of the Commodity Broker’s bankruptcy. Furthermore, in the event of the Commodity Broker’s bankruptcy, any Master Fund Units could be limited to recovering only a pro rata share of all available funds segregated on behalf of the Commodity Broker’s combined customer accounts, even though certain property specifically traceable to a particular Master Fund was held by the Commodity Broker. The Commodity Broker may, from time-to-time, have been the subject of certain regulatory and private causes of action. Such material actions, if any, are described under “The Commodity Broker.”

In the event of a bankruptcy or insolvency of any exchange or a clearing house, a Master Fund could experience a loss of the funds deposited through its Commodity Broker 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.

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 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.

The Managing Owner has consulted with counsel, accountants and other advisers regarding the formation and operation of the Funds and the Master Funds. No counsel has been appointed to represent you in connection with the offering of the Shares. Accordingly, you should consult your own legal, tax and financial advisers regarding the desirability of an investment in the Shares.

The Managing Owner may withdraw from the Funds upon 120 days’ notice, which would cause the Funds and the Master Funds to terminate unless a substitute managing owner were obtained. Owners of 50% of the Shares of any Fund have the power to terminate the Fund. If it is so exercised, investors who may wish to continue to invest in a Fund’s corresponding Index 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 the Fund. See “Description of the Shares and the Master Fund Units; The Funds; Certain Material Terms of the Trust Declarations—Termination Events” for a summary of termination events. Such detrimental developments could cause you to liquidate your investments and upset the overall maturity and timing of your investment portfolio. If the registrations with the CFTC or memberships in the NFA of the Managing Owner or the Commodity Broker were revoked or suspended, such entity would no longer be able to provide services to the Funds and the Master Funds.

As interests in separate series of a Delaware statutory trust, the Shares have none of the statutory rights normally associated with the ownership of shares of a corporation (including, for example, the right to bring “oppression” or “derivative” actions). In addition, 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 in the discretion of the Managing Owner).

While the Managing Owner believes that all intellectual property rights needed to operate the Funds and the Master Funds are either owned by or licensed to the Managing Owner or have been obtained, third parties may allege or assert ownership of intellectual property rights which may be related to the design, structure and operations of the Funds and the Master Funds. To the extent any claims of such ownership are brought or any proceedings are instituted to assert such claims, the negotiation, litigation or settlement of such claims, or the ultimate disposition of such claims in a court of law if a suit is brought, may adversely affect the Funds and the Master Funds and an investment in the Shares, for example, resulting in expenses or damages or the termination of the Funds and the Master Funds.

Under the Trust Declarations, the Trustee and the Managing Owner have the right to be indemnified for any liability or expense either incurs without negligence or misconduct. That means the Managing Owner may require the assets of one or more of the Master Funds 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 net asset value of the Master Fund and the value of the Shares of its corresponding Fund.

Calculating the net asset value of each Master Fund (and, in turn, its corresponding Fund) includes, in part, any unrealized profits or losses on open commodity futures contracts. Under normal circumstances, the net asset value of each Master Fund reflects the settlement price of open commodity futures contracts on the date when the net asset value is being calculated. However, if a commodity futures contract traded on an exchange (both U.S. and, to the extent it becomes applicable, non-U.S. exchanges) could not be liquidated on such day (due to the operation of daily limits or other rules of the exchange upon which that position is traded or otherwise), the settlement price on the most recent day on which the position could have been liquidated will be the basis for determining the market value of such position for such day. In such a situation, there is a risk that the calculation of the net asset value of the applicable Master Fund on such day will not accurately reflect the realizable market value of such commodity futures contract. For example, daily limits are generally triggered in the event of a significant change in market price of a commodity futures contract. Therefore, as a result of the daily limit, the current settlement price is unavailable. Because the settlement price on the most recent day on which the position could have been liquidated would be used in lieu of the actual settlement price on the date of determination, there is a risk that the resulting calculation of the net asset value of the applicable Master Fund (and, in turn, its corresponding Fund) could be under or overstated, perhaps to a significant degree.

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 such Fund any distribution they received

at a time when the Fund was in fact insolvent or in violation of its Trust Declaration. In addition, although the Managing Owner is not aware of this provision ever having been invoked in the case of any public futures fund, Shareholders agree in the Trust Declaration that they will indemnify the Fund for any harm suffered by it as a result of

INVESTMENT OBJECTIVES OF THE FUNDS

Each Fund and its corresponding Master Fund seeks to track changes, whether positive or negative, in the level of its corresponding Index over time, plus the excess, if any, of its corresponding Master Fund’s interest income from its holdings of United States Treasury and other high credit quality short-term fixed income securities over the expenses of each Fund and its corresponding Master Fund. The Shares of each Fund are designed for investors who want a cost-effective and convenient way to invest in a commodity futures on U.S. and non-U.S. markets.

Advantages of investing in the Shares include:

Investing in the Shares does not insulate Shareholders from certain risks, including price volatility.

Each Fund pursues its investment objective by investing substantially all of its assets in its corresponding Master Fund. Each Master Fund pursues its investment objective by investing in a portfolio of exchange-traded futures on the commodities comprising the corresponding Index.

The Trust is comprised of each of the following Funds, each of which, in turn, intends to reflect the below sectors:

PowerShares DB Energy Fund is designed to track the Deutsche Bank Liquid Commodity Index–Optimum Yield Energy Excess Return™ (DBLCI-OY Energy ER™), which is intended to reflect the energy sector.

PowerShares DB Oil Fund is designed to track the Deutsche Bank Liquid Commodity Index–Optimum Yield Crude Oil Excess Return™ (DBLCI-OY CL ER™), which is intended to reflect the changes in market value of the crude oil sector.

PowerShares DB Precious Metals Fund is designed to track the Deutsche Bank Liquid Commodity Index–Optimum Yield Precious Metals Excess Return™ (DBLCI-OY Precious Metals ER™), which is intended to reflect the precious metals sector.

PowerShares DB Gold Fund is designed to track the Deutsche Bank Liquid Commodity Index–Optimum Yield Gold Excess Return™ (DBLCI-OY GC ER™), which is intended to reflect the changes in market value of the gold sector.

PowerShares DB Silver Fund is designed to track the Deutsche Bank Liquid Commodity Index–

Optimum Yield Silver Excess Return™ (DBLCI-OY SI ER™), which is intended to reflect the changes in market value of the silver sector.

PowerShares DB Base Metals Fund is designed to track the Deutsche Bank Liquid Commodity Index–Optimum Yield Industrial Metals Excess Return™ (DBLCI-OY Industrial Metals ER™), which is intended to reflect the base metals sector.

PowerShares DB Agriculture Fund is designed to track the Deutsche Bank Liquid Commodity Index–Optimum Yield Agriculture Excess Return™ (DBLCI-OY Agriculture ER™), which is intended to reflect the agricultural sector.

If the Managing Owner determines in its commercially reasonable judgment that it has become impracticable or inefficient for any reason for any Master Fund to gain full or partial exposure to any Index Commodity by investing in a specific futures contract that comprises the applicable Index, such Master Fund may invest in a futures contract referencing the particular Index Commodity other than the specific contract that comprises the applicable Index. The Managing Owner does not expect the use of other contracts to affect in any material respect any Master Fund’s expenses or result in any material tracking error.

Each Fund will make distributions at the discretion of the Managing Owner. To the extent that a Master Fund’s actual and projected interest income from its holdings of United States Treasury securities and other high credit quality short-term fixed income securities exceeds the actual and projected fees and expenses of such Master Fund and its corresponding Fund, the Managing Owner expects periodically to make distributions of the amount of such excess. The Funds currently do not expect to make distributions with respect to capital gains. Depending on the applicable Fund’s performance for the taxable year and your own tax situation for such year, your income tax liability for the taxable year for your allocable share of such Fund’s net ordinary income or loss and capital gain or loss may exceed any distributions you receive with respect to such year.

The sponsor of each Index, or the Index Sponsor, is Deutsche Bank AG London. DBLCI™ and Deutsche Bank Liquid Commodity Index™ are trade marks of Deutsche Bank AG and are the subject

of Community Trade Mark Nos. 3055043 and 3054996. Trade Mark applications in the United States are pending with respect to both the Trust and aspects of each Index. Deutsche Bank AG is an affiliate of the Fund, the Master Fund and the Managing Owner.

Under the Trust Declarations of each Fund and corresponding Master Fund, Wilmington Trust Company, the Trustee of each Fund and each corresponding Master Fund, has delegated to the Managing Owner the exclusive management and control of all aspects of the business of each Fund and its corresponding Master Fund. The Trustee will have no duty or liability to supervise or monitor the performance of the Managing Owner, nor will the Trustee have any liability for the acts or omissions of the Managing Owner.

The Shares of each Fund are intended to provide investment results that generally correspond to the changes, positive or negative, in the levels of the Fund’s corresponding Index over time.

The value of the Shares of each Fund is expected to fluctuate in relation to changes in the value of its corresponding Master Fund’s portfolio. The market price of the Shares of a Fund may not be identical to the net asset value per Share, but these two valuations are expected to be very close. See “The Risks You Face—(2) Net Asset Value May Not Always Correspond to Market Price and, as a Result, Baskets may be Created or Redeemed at a Value that Differs from the Market Price of the Shares.”

The current trading price per Share of each Fund (quoted in U.S. dollars) is published continuously under its ticker symbol as trades occur throughout each trading day on the consolidated tape, Reuters and/or Bloomberg and on the Managing Owner’s website at http://www.dbfunds.db.com , or any successor thereto.

The most recent end-of-day closing level of each Index is published under its own symbol as of the close of business for the Amex each trading day on the consolidated tape, Reuters and/or Bloomberg and on the Managing Owner’s website at http://www.dbfunds.db.com , or any successor thereto. The most recent end-of-day net asset value of each Fund is published under its own symbol as of the close of business on Reuters and/or Bloomberg and

on the Managing Owner’s website at http://www.dbfunds.db.com , or any successor thereto. In addition, the most recent end-of-day net asset value of each Fund is published the following morning on the consolidated tape.