PIMCO Income Fund

¨ This post-effective amendment designates a new effective date for a previously-filed post-effective amendment.

This Post-Effective Amendment No. 121 to the registration statement of PIMCO Funds (the “Trust”) on Form N-1A (File No. 33-12113) is being filed to (i) register Class A, Class C, Class D, Class R, Institutional Class and Administrative Class shares of the Income Fund, and (ii) make non-material changes to the Trust’s statement of additional information. This amendment does not affect the currently effective prospectuses for other series and classes of the Trust’s shares.

The information in this prospectus is not complete and may be changed. Shares of the Fund may not be sold until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state where the offer or sale is not permitted.

The Fund offers Class A and Class C shares in this prospectus. This prospectus explains what you should know about the Fund before you invest. Please read it carefully.

The Securities and Exchange Commission has not approved or disapproved these securities, or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

The table below describes certain investment characteristics of the Fund. Other important characteristics are described in the Fund Summary beginning on page 4. Following the table are certain key concepts which are used throughout the prospectus.

Consistent with the Fund’s investment policies, the Fund invests in “Fixed Income Instruments,” which as used generally in this prospectus includes:

Securities issued by U.S. Government agencies or government-sponsored enterprises may not be guaranteed by the U.S. Treasury.

Duration is a measure of the expected life of a fixed income security that is used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. Similarly, a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio duration. By way of example, the price of a bond fund with a duration of five years would be expected to fall approximately 5% if interest rates rose by one percentage point.

In this prospectus, references are made to credit ratings of debt securities, which measure an issuer’s expected ability to pay principal and interest over time. Credit ratings are determined by rating organizations, such as S&P or Moody’s. The following terms are generally used to describe the credit quality of debt securities depending on the security’s credit rating or, if unrated, credit quality as determined by PIMCO:

For a further description of credit ratings, see “Appendix A—Description of Securities Ratings.” As noted in Appendix A, Moody’s and S&P may modify their ratings of securities to show relative standing within a rating category, with the addition of numerical modifiers (1, 2 or 3) in the case of Moody’s, and with the addition of a plus (+) or minus (-) sign in the case of S&P. The Fund may purchase a security, regardless of any rating modification, provided the security is rated at or above the Fund’s minimum rating category. For example, the Fund may purchase a security rated B3 by Moody’s, or B- by S&P, because the Fund may purchase securities rated B.

The following summary identifies the Fund’s investment objectives, principal investments and strategies, principal risks, performance information and fees and expenses. A more detailed “Summary of Principal Risks” describing principal risks of investing in the Fund begins after the Fund Summary. Investors should be aware that the investments made by the Fund and the results achieved by the Fund at any given time are not expected to be the same as those made by other mutual funds for which PIMCO acts as investment adviser, including mutual funds with names, investment objectives and policies similar to the Fund. Please see “Disclosure of Portfolio Holdings” in the Statement of Additional Information for information about the availability of the complete schedule of the Fund’s holdings.

An investment in the Fund is not a deposit of a bank and is not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.

The Fund seeks to achieve its investment objectives by investing under normal circumstances at least 65% of its total assets in a multi-sector portfolio of Fixed Income Instruments of varying maturities. The Fund will seek to maintain a high and consistent level of dividend income by investing in a broad array of fixed income sectors and utilizing income efficient implementation strategies. The capital appreciation sought by the Fund generally arises from decreases in interest rates or improving credit fundamentals for a particular sector or security.

The Fund will generally allocate its assets among several investment sectors, which may include, without limitation: (i) high yield securities (“junk bonds”) and investment grade corporate bonds of issuers located in the United States and non-U.S. countries, including emerging market countries; (ii) fixed income securities issued by U.S. and non-U.S. governments (including emerging market governments), their agencies and instrumentalities; (iii) mortgage-related and other asset backed securities; and (iv) foreign currencies, including those of emerging market countries. However, the Fund is not required to gain exposure to any one investment sector, and the Fund’s exposure to any one investment sector will vary over time. The average portfolio duration of this Fund normally varies from two to eight years based on PIMCO’s forecast for interest rates.

The Fund may invest up to 50% of its total assets in high yield securities rated below investment grade but rated at least Caa by Moody’s or CCC by S&P, or, if unrated, determined by PIMCO to be of comparable quality. In addition, the Fund may invest, without limit, in securities denominated in foreign currencies. The Fund may invest up to 20% of its total assets in securities of issuers based in countries with developing (or “emerging market”) economies. The Fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 10% of its total assets. The Fund is non-diversified, which means that it may concentrate its assets in a smaller number of issuers than a diversified fund.

The Fund may invest all of its assets in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls).

The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are:

Please see “Summary of Principal Risks” following the Fund Summary for a description of these and other risks of investing in the Fund.

The Fund does not have a full calendar year of performance. Thus, no bar chart or annual returns table is included for the Fund.

These tables describe the fees and expenses you may pay if you buy and hold Class A or C shares of the Fund:

Examples. The Examples are intended to help you compare the cost of investing in Class A or C shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the noted class of shares for the time periods indicated, and then redeem all your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, the reinvestment of all dividends and distributions, and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, the Examples show what your costs would be based on these assumptions.

The value of your investment in the Fund changes with the values of the Fund’s investments. Many factors can affect those values. The factors that are most likely to have a material effect on the Fund’s portfolio as a whole are called “principal risks.” The principal risks of the Fund are identified in the Fund Summary and are described in this section. The Fund may be subject to additional risks other than those described below because the types of investments made by the Fund can change over time. Securities and investment techniques mentioned in this summary that appear in bold type are described in greater detail under “Characteristics and Risks of Securities and Investment Techniques.” That section and “Investment Objectives and Policies” in the Statement of Additional Information also include more information about the Fund, its investments and the related risks. There is no guarantee that the Fund will be able to achieve its investment objectives. It is possible to lose money by investing in the Fund.

As nominal interest rates rise, the value of fixed income securities held by the Fund is likely to decrease. Securities with longer durations tend to be more sensitive to changes in interest rates, usually making them more volatile than securities with shorter durations. A nominal interest rate can be described as the sum of a real interest rate and an expected inflation rate. Inflation-indexed securities, including Treasury Inflation-Protected Securities, decline in value when real interest rates rise. In certain interest rate environments, such as when real interest rates are rising faster than nominal interest rates, inflation-indexed securities may experience greater losses than other fixed income securities with similar durations.

The Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivatives contract, repurchase agreement or a loan of portfolio securities, is unable or unwilling to make timely principal and/or interest payments, or to otherwise honor its obligations. Securities are subject to varying degrees of credit risk, which are often reflected in credit ratings. Municipal bonds are subject to the risk that litigation, legislation or other political events, local business or economic conditions, or the bankruptcy of the issuer could have a significant effect on an issuer’s ability to make payments of principal and/or interest.

Funds that invest in high yield securities and unrated securities of similar credit quality (commonly known as “junk bonds”) may be subject to greater levels of credit and liquidity risk than funds that do not invest in such securities. These securities are considered predominately speculative with respect to the issuer’s continuing ability to make principal and interest payments. An economic downturn or period of rising interest rates could adversely affect the market for these securities and reduce the Fund’s ability to sell these securities (liquidity risk). If the issuer of a security is in default with respect to interest or principal payments, the Fund may lose its entire investment.

The market price of securities owned by the Fund may go up or down, sometimes rapidly or unpredictably. Securities may decline in value due to factors affecting securities markets generally or particular industries represented in the securities markets. The value of a security may decline due to general market conditions which are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. They may also decline due to factors which affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry. During a general downturn in the securities markets, multiple asset classes may decline in value simultaneously. Equity securities generally have greater price volatility than fixed income securities.

The value of a security may decline for a number of reasons which directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services.

Liquidity risk exists when particular investments are difficult to purchase or sell. The Fund’s investments in illiquid securities may reduce the returns of the Fund because it may be unable to sell the illiquid securities at an advantageous time or price. To the extent that the Fund’s principal investment strategies involve foreign (non-U.S.) securities, derivatives or securities with substantial market and/or credit risk, the Fund will tend to have the greatest exposure to liquidity risk.

Derivatives are financial contracts whose value depends on, or is derived from, the value of an underlying asset, reference rate or index. The various derivative instruments that the Fund may use are referenced under “Characteristics and Risks of Securities and Investment Techniques—Derivatives” in this prospectus and described in more detail under “Investment Objectives and Policies” in the Statement of Additional Information.

The Fund typically uses derivatives as a substitute for taking a position in the underlying asset and/or as part of a strategy designed to reduce exposure to other risks, such as interest rate or currency risk. The Fund may also use derivatives for leverage, in which case their use would involve leveraging risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. Derivatives are subject to a number of risks described elsewhere in this section, such as liquidity risk, interest rate risk, market risk, credit risk and management risk. They also involve the risk of mispricing or improper valuation and the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. If the Fund invests in a derivative instrument, it could lose more than the principal amount invested. Also, suitable derivative transactions may not be available in all circumstances and there can be no assurance that the Fund will engage in these transactions to reduce exposure to other risks when that would be beneficial.

When the Fund purchases mortgage-related securities, it is subject to certain additional risks. Rising interest rates tend to extend the duration of mortgage-related securities, making them more sensitive to changes in interest rates. As a result, in a period of rising interest rates, if the Fund holds mortgage-related securities, it may exhibit additional volatility. This is known as extension risk. In addition, mortgage-related securities are subject to prepayment risk. When interest rates decline, borrowers may pay off their mortgages sooner than expected. This can reduce the returns of the Fund because the Fund will have to reinvest that money at the lower prevailing interest rates. This is known as contraction risk.

When the Fund invests in foreign (non-U.S.) securities, it may experience more rapid and extreme changes in value than if it had invested exclusively in securities of U.S. companies. The securities markets of many foreign countries are relatively small, with a limited number of companies representing a small number of industries. Additionally, issuers of foreign securities are usually not subject to the same degree of regulation as U.S. issuers. Reporting, accounting and auditing standards of foreign countries differ, in some cases significantly, from U.S. standards. Also, nationalization, expropriation or confiscatory taxation, currency blockage, political changes or diplomatic developments could adversely affect the Fund’s investments in a foreign country. In the event of nationalization, expropriation or other confiscation, the Fund could lose its entire investment in foreign securities. Adverse conditions in a certain region can adversely affect securities of other countries whose economies appear to be unrelated. To the extent that the Fund invests a significant portion of its assets in a concentrated geographic area like Eastern Europe or Asia, the Fund will generally have more exposure to regional economic risks associated with foreign investments.

Foreign investment risk may be particularly high to the extent that the Fund invests in emerging market securities of issuers based in countries with developing economies. These securities may present market, credit, currency, liquidity, legal, political and other risks different from, or greater than, the risks of investing in developed foreign countries.

When the Fund invests directly in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, foreign (non-U.S.) currencies, or in derivatives that provide exposure to foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar, or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged. Currency rates in foreign countries may fluctuate significantly over short periods of time for a number of reasons, including changes in interest rates, intervention (or the failure to intervene) by U.S. or foreign governments, central banks or supranational entities such as the International Monetary Fund, or by the imposition of currency controls or other political developments in the United States or abroad. As a result, the Fund’s investments in foreign currency-denominated securities may reduce the returns of the Fund.

Focusing investments in a small number of issuers, industries or foreign currencies increases risk. The Fund is “non-diversified”, which means that it may invest a greater percentage of its assets in the securities of a single issuer than funds that are “diversified.” Funds that invest in a relatively small number of issuers are more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified fund might be. Some of those issuers also may present substantial credit or other risks. Similarly, the Fund may be more sensitive to adverse economic, business or political developments if it invests a substantial portion of its assets in the bonds of similar projects or from issuers in a single state.

Certain transactions may give rise to a form of leverage. Such transactions may include, among others, reverse repurchase agreements, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions. The use of derivatives may also create leveraging risk. To mitigate leveraging risk, PIMCO will segregate or “earmark” liquid assets or otherwise cover transactions that may give rise to such risk.

The Fund also may be exposed to leverage risk by borrowing money for investment purposes. The use of leverage may cause the Fund to liquidate portfolio positions to satisfy its obligations or to meet segregation requirements, when it may not be advantageous to do so. Leverage, including borrowing, may cause the Fund to be more volatile than if the Fund had not been leveraged. This is because leverage tends to exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.

The Fund is subject to management risk because it is an actively managed investment portfolio. PIMCO and the portfolio managers will apply investment techniques and risk analyses in making investment decisions for the Fund, but there can be no guarantee that these will produce the desired results.

PIMCO serves as the investment adviser and the administrator (serving in its capacity as administrator, the “Administrator”) for the Fund. Subject to the supervision of the Board of Trustees, PIMCO is responsible for managing the investment activities of the Fund and the Fund’s business affairs and other administrative matters.

PIMCO is located at 840 Newport Center Drive, Newport Beach, CA 92660. Organized in 1971, PIMCO provides investment management and advisory services to private accounts of institutional and individual clients and to mutual funds. As of September 30, 2006, PIMCO had approximately $641 billion in assets under management.

The Fund pays PIMCO fees in return for providing investment advisory services. The Fund will pay monthly advisory fees to PIMCO at the annual rate (stated as a percentage of the average daily net assets of the Fund) of 0.25%. PIMCO has contractually agreed, until March 31, 2008, to waive a portion of its advisory fee equal to 0.05% of average daily net assets of the Fund.

A discussion of the basis for the Board of Trustees’ approval of the Fund’s investment advisory contract will be available in the Fund’s annual or semi-annual report to shareholders. As of the date of this prospectus, the Fund has not commenced operations.

The Fund pays for the administrative services it requires under what is essentially an all-in fee structure. Class A and Class C shareholders of the Fund pay an administrative fee to PIMCO, computed as a percentage of the Fund’s assets attributable in the aggregate to that class of shares. PIMCO, in turn, provides or procures administrative services for Class A and Class C shareholders and also bears the costs of various third-party services required by the Fund, including audit, custodial, portfolio accounting, legal, transfer agency and printing costs. The Fund does bear other expenses which are not covered under the administrative fee which may vary and affect the total level of expenses paid by Class A and C shareholders, such as brokerage fees, commissions and other transaction expenses, costs of borrowing money, including interest expenses, extraordinary expenses (such as litigation and indemnification expenses) and fees and expenses of the Trust’s Independent Trustees and their counsel. PIMCO generally earns a profit on the administrative fee. Also, under the terms of the administration agreement, PIMCO, and not Fund shareholders, would benefit from any price decreases in third-party services, including decreases resulting from an increase in net assets.

The Fund will pay PIMCO monthly administrative fees at the annual rate (stated as a percentage of the average daily net assets attributable in the aggregate to the Fund’s Class A and Class C shares) of 0.40%.

PIMCO has contractually agreed, for the Fund’s current fiscal year, to reduce total annual fund operating expenses for each of the Class A and Class C shares, by waiving a portion of its administrative fee or reimbursing the Fund, to the extent that they would exceed, due to the payment of organizational expenses, the sum of the Fund’s advisory fee (prior to the application of the advisory fee waiver described above), distribution fees (applicable only with respect to Class C shares), service fees and administrative fee, plus 0.49 basis points. PIMCO may recoup these waivers and reimbursements for a period not exceeding three years, provided that total expenses, including such recoupment, do not exceed the annual expense limit.

Please see the Statement of Additional Information for additional information about other accounts managed by the portfolio managers, the portfolio managers’ compensation and the portfolio managers’ ownership of shares of the Fund.

The Trust’s Distributor is Allianz Global Investors Distributors LLC (“AGID” or “Distributor”), an indirect subsidiary of Allianz Global Investors of America L.P. (“AGI”), PIMCO’s parent company. The Distributor, located at 2187 Atlantic Street, Stamford, CT 06902, is a broker-dealer registered with the Securities and Exchange Commission (“SEC”).

Since February 2004, PIMCO, AGI, AGID, and certain of their affiliates, including the Trust, Allianz Funds (formerly known as PIMCO Funds: Multi-Manager Series), the Trustees of the Trust, and certain employees of PIMCO have been named as defendants in fifteen lawsuits filed in various jurisdictions. Eleven of those lawsuits concern “market timing,” and they have been transferred to and consolidated for pre-trial proceedings in a multi-district litigation proceeding in the U.S. District Court for the District of Maryland; the other four lawsuits concern “revenue sharing” and have been consolidated into a single action in the U.S. District Court for the District of Connecticut. The lawsuits have been commenced as putative class actions on behalf of investors who purchased, held or redeemed shares of the various series of the Trust and the Allianz Funds during specified periods, or as derivative actions on behalf of the Trust and Allianz Funds.

The market timing actions in the District of Maryland generally allege that certain hedge funds were allowed to engage in “market timing” in certain of the Allianz Funds and funds of the Trust and this alleged activity was not disclosed. Pursuant to tolling agreements entered into with the derivative and class action plaintiffs, PIMCO, the Trustees, and certain employees of PIMCO who were previously named as defendants have all been dropped as defendants in the market timing actions; the plaintiffs continue to assert claims on behalf of the shareholders of the Trust or on behalf of the Trust itself against other defendants. By order dated November 3, 2005, the U.S. District Court for the District of Maryland granted the Trust’s motion to dismiss claims asserted against it in a consolidated amended complaint where the Trust was named, in the complaint, as a nominal defendant. The revenue sharing action in the District of Connecticut generally alleges that fund assets were inappropriately used to pay brokers to promote the Allianz Funds and funds of the Trust, including directing fund brokerage transactions to such brokers, and that such alleged arrangements were not fully disclosed to shareholders. On August 11, 2005 the U.S. District Court for the District of Connecticut conducted a hearing on defendants’ motion to dismiss the consolidated amended complaint in the revenue sharing action but has not yet ruled on the motion to dismiss. The market timing and revenue sharing lawsuits seek, among other things, unspecified compensatory damages plus interest and, in some cases, punitive damages, the rescission of investment advisory contracts, the return of fees paid under those contracts and restitution.

Two nearly identical class action civil complaints have been filed in August 2005, in the Northern District of Illinois Eastern Division, alleging that the plaintiffs each purchased and sold a 10-year Treasury note futures contract and suffered damages from an alleged shortage when PIMCO held both physical and futures positions in 10-year Treasury notes for its client accounts. The two actions have been consolidated into one action, and the two separate complaints have been replaced by a consolidated complaint. PIMCO is a named defendant, and the Trust has been added as a defendant, to the consolidated action. PIMCO strongly believes the complaint is without merit and intends to vigorously defend itself.

In April 2006, certain funds of the Trust were served in an adversary proceeding brought by the Official Committee of Asbestos Claimants of G-I Holdings, Inc. in G-I Holdings, Inc.’s bankruptcy in the District of New Jersey. In July 2004, PIMCO was named in this lawsuit and remains a defendant. The plaintiff seeks to recover for the bankruptcy estate assets that were transferred by the predecessor entity of G-I Holdings, Inc. to a wholly-owned subsidiary in 1994. The subsidiary has since issued notes, of which certain funds of the Trust are alleged to be holders. The complaint alleges that in 2000, more than two hundred noteholders—including certain funds of the Trust—were granted a second priority lien on the assets of the subsidiary in exchange for their consent to a refinancing transaction and the granting of a first priority lien to the lending banks. The plaintiff is seeking invalidation of the lien in favor of the noteholders and/or the value of the lien. On June 21, 2006, the District of New Jersey overturned the Bankruptcy Court’s decision granting permission to file the adversary proceeding and remanded the matter to the Bankruptcy Court for further proceedings. Following a motion to reconsider, the District Court upheld its remand on August 7, 2006, and instructed the Bankruptcy Court to conduct a “cost-benefit” analysis of the Committee’s claims, including the claims against the noteholders. The Bankruptcy Court held a status conference on October 25, 2006 and set a briefing schedule relating to this cost-benefit analysis.

It is possible that these matters and/or other developments resulting from these matters could result in increased fund redemptions or other adverse consequences to the Fund. However, PIMCO and AGID believe that these matters are not likely to have a material adverse effect on the Fund or on PIMCO’s or AGID’s ability to perform their respective investment advisory or distribution services relating to the Fund.

The foregoing speaks only as of the date of this prospectus. While there may be additional litigation or regulatory developments in connection with the matters discussed above, the foregoing disclosure of litigation and regulatory matters will be updated only if those developments are material.

The Trust offers investors Class A and Class C shares in this prospectus. Class A shares are subject to different types and levels of sales charges and other fees than the Class C shares and bear a different level of expenses.

The class of shares that is best for you depends upon a number of factors, including the amount and the intended length of your investment. The following summarizes key information about each class to help you make your investment decision, including the various expenses associated with each class and the payments made to financial intermediaries for distribution and other services. More extensive information about the Trust’s multi-class arrangements is included in the Allianz Funds and PIMCO Funds Shareholders’ Guide for Class A, B, C and R Shares (the “Guide”), which is included as part of the Statement of Additional Information and can be obtained free of charge from the Distributor. See “How to Buy and Sell Shares—Allianz Funds and PIMCO Funds Shareholders’ Guide” below.

Some or all of the payments described below are paid or “reallowed” to financial intermediaries. The following provides additional information about the sales charges and other expenses associated with Class A and Class C shares.

This section includes important information about sales charge reduction programs available to investors in Class A shares of the Fund and describes information or records you may need to provide to the Distributor or your financial intermediary in order to be eligible for sales charge reduction programs.

Unless you are eligible for a waiver, the public offering price you pay when you buy Class A shares of the Fund is the net asset value (“NAV”) of the shares plus an initial sales charge. The initial sales charge varies depending upon the size of your purchase, as set forth below. No sales charge is imposed where Class A shares are issued to you pursuant to the automatic reinvestment of income dividends or capital gains distributions. For investors investing in Class A shares of the Fund through a financial intermediary, it is the responsibility of the financial intermediary to ensure that the investor obtains the proper “breakpoint” discount.

Investors in the Fund may reduce or eliminate sales charges applicable to purchases of Class A shares through utilization of the Combined Purchase Privilege, the Cumulative Quantity Discount (Right of Accumulation), a Letter of Intent or the Reinstatement Privilege. These programs, which apply to purchases of one of more funds that are series of the Trust or Allianz Funds that offer Class A shares (other than the PIMCO Money Market Fund) (together, “Eligible Funds”), are summarized below and are described in greater detail in the Guide.

Right of Accumulation and Combined Purchase Privilege (Breakpoints). A Qualifying Investor (as defined below) may qualify for a reduced sales charge on Class A shares (the “Combined Purchase Privilege”) by combining concurrent purchases of the Class A shares of one or more Eligible Funds into a single purchase. In addition, a Qualifying Investor may qualify for a reduced sales charge on Class A shares (the “Right of Accumulation” or “Cumulative Quality Discount”) by combining the purchase of Class A shares of an Eligible Fund with the current aggregate net asset value of all Class A, B, and C shares of any Eligible Fund held by accounts for the benefit of such Qualifying Investor.

(i) an individual, such individual’s spouse, such individual’s children under the age of 21 years, or such individual’s siblings (each a “family member”) (including family trust* accounts established by such a family member); or

(ii) a trustee or other fiduciary for a single trust (except family trusts* noted above), estate or fiduciary account although more than one beneficiary may be involved; or

*For the purpose of determining whether a purchase would qualify for a reduced sales charge under the Combined Purchase Privilege or Right of Accumulation, a “family trust” is one in which a family member(s) described in section (i) above is/are a beneficiary/ies and such person(s) and/or another family member is the trustee.

Please see the Guide for details and for restrictions applicable to shares held by certain employer-sponsored benefit programs.

Letter of Intent. An investor may also obtain a reduced sales charge on purchases of Class A shares by means of a written Letter of Intent, which expresses an intent to invest not less than $50,000 within a period of 13 months in Class A shares of any Eligible Fund(s). The maximum intended investment allowable in a Letter of Intent is $1,000,000. Each purchase of shares under a Letter of Intent will be made at the public offering price or prices applicable at the time of such purchase to a Single Purchase of the dollar amount indicated in the Letter of Intent. A Letter of Intent is not a binding obligation to purchase the full amount indicated. Shares purchased with the first 5% of the amount indicated in the Letter of Intent will be held in escrow (while remaining registered in your name) to secure payment of the higher sales charges applicable to the shares actually purchased in the event the full intended amount is not purchased.

Reinstatement Privilege. A Class A shareholder who has caused any or all of his shares to be redeemed may reinvest all or any portion of the redemption proceeds in Class A shares of any Eligible Fund at NAV without any sales charge, provided that such investment is made within 120 calendar days after the redemption or repurchase date. The limitations and restrictions of this program are fully described in the Guide.

Method of Valuation of Accounts. To determine whether a shareholder qualifies for a reduction in sales charge on a purchase of Class A shares of Eligible Funds, the offering price of the shares is used for purchases relying on the Combined Purchase Privilege or a Letter of Intent and the amount of the total current purchase (including any sales load) plus the NAV (at the close of business on the day of the current purchase) of shares previously acquired is used for the Cumulative Quantity Discount.

Sales at Net Asset Value. In addition to the programs summarized above, the Fund may sell its Class A shares at NAV without an initial sales charge to certain types of accounts or account holders, including, but not limited to: Trustees of the Fund; employees of PIMCO and the Distributor; employees of participating brokers; certain trustees or other fiduciaries purchasing shares for retirement plans; participants investing in certain “wrap accounts” and investors who purchase shares through a participating broker who has waived all or a portion of the payments it normally would receive from the Distributor at the time of purchase. In addition, Class A shares of the Fund issued pursuant to the automatic reinvestment of income dividends or capital gains distributions are issued at NAV and are not subject to any sales charges.

Required Shareholder Information and Records. In order for investors in Class A shares of the Fund to take advantage of sales charge reductions, an investor or his or her financial intermediary must notify the Distributor that the investor qualifies for such a reduction. If the Distributor is not notified that the investor is eligible for these reductions, the Distributor will be unable to ensure that the reduction is applied to the investor’s account. An investor may have to provide certain information or records to his or her financial intermediary or the Distributor to verify the investor’s eligibility for breakpoint privileges or other sales charge waivers. An investor may be asked to provide information or records, including account statements, regarding shares of the Fund or other Eligible Funds held in:

The Trust makes available free of charge and in a clear and prominent format, on the Fund’s Web site at www.allianzinvestors.com, information regarding eliminations of and reductions in sales loads associated with Eligible Funds.

Unless a waiver applies, investors who purchase $1,000,000 or more of Class A shares (and, thus, pay no initial sales charge) of the Fund will be subject to a 1% CDSC if the shares are redeemed within 18 months of their purchase. The Class A CDSC does not apply if you are otherwise eligible to purchase Class A shares without an initial sales charge or are eligible for a waiver of the CDSC. See “Reductions and Waivers of Initial Sales Charges and CDSCs” below.

Unless you are eligible for a waiver, if you sell (redeem) your Class C shares within 18 months of their purchase, you will pay a 1% CDSC. For investors investing in Class C shares of the Fund through a financial intermediary, it is the responsibility of the financial intermediary to ensure that the investor is credited with the proper holding period for the shares redeemed.

A CDSC is imposed on redemptions of Class C shares (and where applicable, Class A shares) on the amount of the redemption which causes the current value of your account for the particular class of shares of the Fund to fall below the total dollar amount of your purchase payments subject to the CDSC.

The initial sales charges on Class A shares and the CDSCs on Class A and Class C shares may be reduced or waived under certain purchase arrangements and for certain categories of investors. Please see the Guide for details. The Guide is available free of charge from the Distributor. See “How to Buy and Sell Shares—Allianz Funds and PIMCO Funds Shareholders’ Guide” below.

The Fund pays fees to the Distributor on an ongoing basis as compensation for the services the Distributor renders and the expenses it bears in connection with the sale and distribution of Fund shares (“distribution fees”) and/or in connection with personal services rendered to Fund shareholders and the maintenance of shareholder accounts (“servicing fees”). These payments are made pursuant to Distribution and Servicing Plans (“12b-1 Plans”) adopted by the Fund pursuant to Rule 12b-1 under the Investment Company Act of 1940, as amended (“1940 Act”).

There is a separate 12b-1 Plan for each class of shares offered in this prospectus. Class A shares pay only servicing fees. Class C shares pay both distribution and servicing fees. The following lists the maximum annual rates at which the distribution and/or servicing fees may be paid under each 12b-1 Plan (calculated as a percentage of the Fund’s average daily net assets attributable to the particular class of shares):

Because distribution fees are paid out of the Fund’s assets on an ongoing basis, over time these fees will increase the cost of your investment and may cost you more than other types of sales charges, such as sales charges that are deducted at the time of investment. Therefore, although Class C shares do not pay initial sales charges, the distribution fees payable on Class C shares may, over time, cost you more than the initial sales charge imposed on Class A shares.

Some or all of the sales charges, distribution fees and servicing fees described above are paid or “reallowed” to the broker, dealer or financial adviser (collectively, “financial firms”) through which you purchase your shares. With respect to Class C shares, the financial firms are also paid at the time of your purchase a commission of up to 1.00% of your investment in such share class. Please see the Statement of Additional Information and Guide for more details. A financial firm is one that, in exchange for compensation, sells, among other products, mutual fund shares (including the shares offered in this prospectus) or provides services for mutual fund shareholders. Financial firms include brokers, dealers, insurance companies and banks.

In addition, AGID, PIMCO and their affiliates (for purposes of this subsection only, collectively, the “Distributor”) may from time to time make payments such as cash bonuses or provide other incentives to selected financial firms as compensation for services such as, without limitation, providing the Fund with “shelf space” or a higher profile for the financial firms’ financial consultants and their customers, placing the Fund on the financial firms’ preferred or recommended fund list, granting the Distributor access to the financial firms’ financial consultants, providing assistance in training and educating the financial firms’ personnel, and furnishing marketing support and other specified services. These payments may be significant to the financial firms and may also take the form of sponsorship of seminars or informational meetings or payment for attendance by persons associated with the financial firms at seminars or informational meetings.

particular class of shares, during a specified period of time. The Distributor may also make payments to one or more participating financial firms based upon factors such as the amount of assets a financial firm’s clients have invested in the Fund and the quality of the financial firm’s relationship with the Distributor.

The payments described above are made at the Distributor’s expense. These payments may be made to financial firms selected by the Distributor, generally to the financial firms that have sold significant amounts of shares of the Fund. The level of payments made to a financial firm in any future year will vary and generally will not exceed the sum of (a) 0.10% of such year’s fund sales by that financial firm and (b) 0.06% of the assets attributable to that financial firm invested in equity funds sponsored by the Distributor and 0.03% of the assets invested in fixed-income funds sponsored by the Distributor. In certain cases, the payments described in the preceding sentence may be subject to certain minimum payment levels. In lieu of payments pursuant to the foregoing formulae, the Distributor may make payments of an agreed upon amount which normally will not exceed the amount that would have been payable pursuant to the formulae. There are a few existing relationships on different bases are expected to terminate, although the actual termination date is not known. In some cases, in addition to the payments described above, the Distributor will make payments for special events such as a conference or seminar sponsored by one of such financial firms.

Wholesale representatives of the Distributor visit brokerage firms on a regular basis to educate financial advisors about the Fund and to encourage the sale of Fund shares to their clients. The costs and expenses associated with these efforts may include travel, lodging, sponsorship at educational seminars and conferences, entertainment and meals to the extent permitted by law.

Although the Fund may use financial firms that sell Fund shares to effect transactions for the Fund’s portfolio, the Fund and PIMCO will not consider the sale of Fund shares as a factor when choosing financial firms to effect those transactions.

For further details about payments made by the Distributor to financial firms, please see the Statement of Additional Information and Guide.

From time to time, PIMCO or its affiliates may pay investment consultants or their parent or affiliated companies for certain services including technology, operations, tax, or audit consulting services, and may pay such firms for PIMCO’s attendance at investment forums sponsored by such firms or for various studies, surveys, or access to databases. Subject to applicable law, PIMCO and its affiliates may also provide investment advisory services to investment consultants and their affiliates and may execute brokerage transactions on behalf of the Fund with such investment consultants or their affiliates. These consultants or their affiliates may, in the ordinary course of their investment consultant business, recommend that their clients utilize PIMCO’s investment advisory services or invest in the Fund or in other products sponsored by PIMCO and its affiliates.

The NAV of the Fund’s Class A and Class C shares is determined by dividing the total value of the Fund’s portfolio investments and other assets attributable to that class, less any liabilities, by the total number of shares outstanding of that class.

Fund shares are valued as of the close of regular trading (normally 4:00 p.m., Eastern time) (the “NYSE Close”) on each day that the New York Stock Exchange (“NYSE”) is open. For purposes of calculating the NAV, the Fund normally uses pricing data for domestic equity securities received shortly after the NYSE Close and does not normally take into account trading, clearances or settlements that take place after the NYSE Close. Domestic fixed income and foreign securities are normally priced using data reflecting the earlier closing of the principal markets for those securities. Information that becomes known to the Fund or its agents after the NAV has been calculated on a particular day will not generally be used to retroactively adjust the price of a security or the NAV determined earlier that day.

For purposes of calculating NAV, portfolio securities and other assets for which market quotes are readily available are stated at market value. Market value is generally determined on the basis of last reported sales prices, or if no sales are reported, based on quotes obtained from a quotation reporting system, established market makers, or pricing services. Short-term investments having a maturity of 60 days or less are generally valued at amortized cost. Exchange traded options, futures and options on futures are valued at the settlement price determined by the exchange.

Investments initially valued in currencies other than the U.S. dollar are converted to U.S. dollars using exchange rates obtained from pricing services. As a result, the NAV of the Fund’s shares may be affected by changes in the value of currencies in relation to the U.S. dollar. The value of securities traded in markets outside the United States or denominated in currencies other than the U.S. dollar may be affected significantly on a day that the NYSE is closed and an investor is not able to purchase, redeem or exchange shares.

Securities and other assets for which market quotes are not readily available are valued at fair value as determined in good faith by the Board of Trustees or persons acting at their direction. The Board of Trustees has adopted methods for valuing securities and other assets in circumstances where market quotes are not readily available, and has delegated to PIMCO the responsibility for applying the valuation methods. In the event that market quotes are not readily available, and the security or asset cannot be valued pursuant to one of the valuation methods, the value of the security or asset will be determined in good faith by the Valuation Committee of the Board of Trustees, generally based upon recommendations provided by PIMCO.

Market quotes are considered not readily available in circumstances where there is an absence of current or reliable market-based data (e.g., trade information, bid/asked information, broker quotes), including where events occur after the close of the relevant market, but prior to the NYSE Close, that materially affect the values of the Fund’s securities or assets. In addition, market quotes are considered not readily available when, due to extraordinary circumstances, the exchanges or markets on which the securities trade do not open for trading for the entire day and no other market prices are available. The Board has delegated to PIMCO the responsibility for monitoring significant events that may materially affect the values of the Fund’s securities or assets and for determining whether the value of the applicable securities or assets should be re-evaluated in light of such significant events.

When the Fund uses fair value pricing to determine its NAV, securities will not be priced on the basis of quotations from the primary market in which they are traded, but rather may be priced by another method that the Board of Trustees or persons acting at their direction believe accurately reflects fair value. The Trust’s policy is intended to result in a calculation of the Fund’s NAV that fairly reflects security values as of the time of pricing. However, fair values determined by the Board of Trustees or persons acting at their direction may not accurately reflect the price that the Fund could obtain for a security if it were to dispose of that security as of the time of pricing. The Fund’s use of fair valuation may also help to deter “stale price arbitrage” as discussed below under “Abusive Trading Practices.” Fair value pricing may require subjective determinations about the value of a security.

The following section provides basic information about how to buy, sell (redeem) and exchange shares of the Fund.

More detailed information about purchase, redemption and exchange arrangements for Fund shares is provided in the Allianz Funds and PIMCO Funds Shareholders’ Guide, which is included in the Statement of Additional Information and can be obtained free of charge from the Distributor by written request or by calling 1-800-426-0107. The Guide provides technical information about the basic arrangements described below and also describes special purchase, sale and exchange features and programs offered by the Trust, including:

When you buy shares of the Fund, you pay a price equal to the NAV of the shares, plus any applicable sales charge. When you sell (redeem) shares, you receive an amount equal to the NAV of the shares, minus any applicable CDSC and/or redemption fees. NAVs are determined at the close of regular trading (normally 4:00 p.m., Eastern time) on each day the NYSE is open. See “How Fund Shares Are Priced” above for details. Generally, purchase and redemption orders for Fund shares are processed at the NAV next calculated after your order is received by the Distributor. There are certain exceptions where an order is received by a broker or dealer prior to the NYSE Close and then transmitted to the Distributor after the NAV has been calculated for that day (in which case the order may be processed according to that day’s NAV). Please see the Guide for details.

The Trust does not calculate NAVs or process orders on days when the NYSE is closed. If your purchase or redemption order is received by the Distributor on a day when the NYSE is closed, it will be processed on the next succeeding day when the NYSE is open (according to the succeeding day’s NAV).

If you wish to invest directly by mail, please send a check payable to Allianz Global Investors Distributors LLC, along with a completed application form to:

The Trust accepts all purchases by mail subject to collection of checks at full value and conversion into federal funds. You may make subsequent purchases by mailing a check to the address above with a letter describing the investment or with the additional investment portion of a confirmation statement. Checks for subsequent purchases should be payable to Allianz Global Investors Distributors LLC and should clearly indicate your account number. Please call the Distributor at 1-800-426-0107 if you have any questions regarding purchases by mail.

The Distributor reserves the right to require payment by wire or U.S. bank check. The Distributor generally does not accept payments made by cash, temporary/starter checks, third-party checks, credit cards, traveler’s checks, credit card checks, or checks drawn on non-U.S. banks even if payment may be effected through a U.S. bank.

The Guide describes a number of additional ways you can make direct investments, including through the Allianz Funds and PIMCO Funds Auto-Invest and Allianz Funds and PIMCO Funds Fund Link programs. You can obtain a Guide free of charge from the Distributor by written request or by calling 1-800-426-0107. See “Allianz Funds and PIMCO Funds Shareholders’ Guide” above.

The Distributor, in its sole discretion, may accept or reject any order for purchase of Fund shares. No share certificates will be issued unless specifically requested in writing.

Investment Minimums. The following investment minimums apply for purchases of Class A and Class C shares.

Lower minimums may apply for certain categories of investors, including certain tax-qualified retirement plans and asset based fee programs, and for special investment programs and plans offered by the Trust, such as the Allianz Funds and PIMCO Funds Auto-Invest and Allianz Funds and PIMCO Funds Fund Link programs. Please see the Guide for details.

The Trust encourages shareholders to invest in the Fund as part of a long-term investment strategy and discourages excessive, short-term trading and other abusive trading practices, sometimes referred to as “market timing.” However, because the Trust will not always be able to detect market timing or other abusive trading activity, investors should not assume that the Trust will be able to detect or prevent all market timing or other trading practices that may disadvantage the Fund.

Certain of the Fund’s investment strategies may make the Fund more susceptible to market timing activities. For example, since the Fund may invest in non-U.S. securities, it may be subject to the risk that an investor may seek to take advantage of a delay between the change in value of the Fund’s non-U.S. portfolio securities and the determination of the Fund’s NAV as a result of different closing times of U.S. and non-U.S. markets by buying or selling Fund shares at a price that does not reflect their true value. A similar risk exists for the Fund’s potential investment in securities of small capitalization companies, securities of issuers located in emerging markets or high yield securities that are thinly traded and therefore may have actual values that differ from their market prices.

To discourage excessive, short-term trading and other abusive trading practices, the Trust’s Board of Trustees has adopted policies and procedures reasonably designed to detect and prevent short-term trading activity that may be harmful to the Fund and its shareholders. Such activities may have a detrimental effect on the Fund and its shareholders. For example, depending upon various factors such as the size of the Fund and the amount of its assets maintained in cash, short-term or excessive trading by Fund shareholders may interfere with the efficient management of the Fund’s portfolio, increase transaction costs and taxes, and may harm the performance of the Fund and its shareholders.

The Trust seeks to deter and prevent abusive trading practices, and to reduce these risks, through several methods. First, the Trust imposes redemption fees on most Fund shares redeemed or exchanged within a given period after their purchase. The purpose of redemption fees is to deter excessive, short-term trading and other abusive trading practices and to help offset the costs associated with the sale of portfolio securities to satisfy redemption and exchange requests. See “Redemption Fees” below for further information. In certain situations, the Fund has elected not to impose redemption fees. See “Waiver of Redemption Fees” below for a discussion on the specific situations in which the Fund will not impose redemption fees.

Second, to the extent that there is a delay between a change in the value of a mutual fund’s portfolio holdings, and the time when that change is reflected in the NAV of the Fund’s shares, the Fund is exposed to the risk that investors may seek to exploit this delay by purchasing or redeeming shares at NAVs that do not reflect appropriate fair value prices. The Trust seeks to deter and prevent this activity, sometimes referred to as “stale price arbitrage,” by the appropriate use of “fair value” pricing of the Fund’s portfolio securities. See “How Fund Shares Are Priced” below for more information.

Third, the Trust seeks to monitor shareholder account activities in order to detect and prevent excessive and disruptive trading practices. The Trust and PIMCO each reserve the right to restrict or refuse any purchase or exchange transaction if, in the judgment of the Trust or of PIMCO, the transaction may adversely affect the interests of the Fund or its shareholders. Among other things, the Trust may monitor for any patterns of frequent purchases and sales that appear to be made in response to short-term fluctuations in share price, and may also monitor for any attempts to improperly avoid the imposition of redemption fees. Notice of any restrictions or rejections of transactions may vary according to the particular circumstances.

Although the Trust and its service providers seek to use these methods to detect and prevent abusive trading activities, and although the Trust will consistently apply such methods, there can be no assurances that such activities can be mitigated or eliminated. By their nature, omnibus accounts, in which purchases and sales of Fund shares by multiple investors are aggregated for presentation to the Fund on a net basis, conceal the identity of the individual investors from the Fund. This makes it more difficult for the Fund to identify short-term transactions in the Fund.

Because of the disproportionately high costs of servicing accounts with low balances, you will be charged a fee at the annual rate of $16 if your account balance for the Fund falls below a minimum level of $2,500, except for Uniform Gift to Minors, IRA, Roth IRA, employer-sponsored retirement plan accounts, Money Purchase and/or Profit Sharing plans, 401(k) plans, 403(b)(7) custodial accounts, SIMPLE IRAs, SEPs, SAR/SEPs, Auto-Invest and Auto-Exchange accounts, for which the minimum balance is $1,000. (A separate custodial fee may apply to IRAs, Roth IRAs and other retirement accounts.) However, you will not be charged this fee if the aggregate value of all of your Allianz Funds and PIMCO Funds accounts is at least $50,000. Any applicable small account fee will be deducted automatically from your below-minimum Fund account in quarterly installments and paid to the Administrator. Lower minimum balance requirements and waivers of the small account fee apply for certain categories of investors. Please see the Guide for details.

Due to the relatively high cost to the Fund of maintaining small accounts, you are asked to maintain an account balance in the Fund in which you invest of at least the minimum investment necessary to open the particular type of account. If your balance for the Fund remains below the minimum for three months or longer, the Administrator has the right (except in the case of employer-sponsored retirement accounts) to redeem your remaining shares and close that Fund account after giving you 60 days to increase your balance. Your Fund account will not be liquidated if the reduction in size is due solely to a decline in market value of your Fund shares or if the aggregate value of all your Allianz Funds and PIMCO Funds accounts exceeds $50,000.

You may exchange your Class A or Class C shares of the Fund for the same Class of shares of any other series of the Trust or of a fund of Allianz Funds. Shares are exchanged on the basis of their respective NAVs next calculated after your exchange order is received by the Distributor. Exchanges of shares held less than a certain number of days may be subject to a redemption fee. See “Redemption Fees” below. Exchanges are subject to the $5,000 minimum initial purchase requirements for the Fund, except with respect to tax-qualified programs and exchanges effected through the Allianz Funds and PIMCO Funds Auto-Exchange plan. If you maintain your account with the Distributor, you may exchange shares by completing a written exchange request and sending it to Allianz Global Investors Distributors LLC, P.O. Box 9688, Providence, RI 02940-0926. You can get an exchange form by calling the Distributor at 1-800-426-0107.

The Trust reserves the right to refuse exchange purchases (or purchase and redemption and/or redemption and purchase transactions) if, in the judgment of PIMCO, the transaction would adversely affect the Fund and its shareholders. Although the Trust has no current intention of terminating or modifying the exchange privilege, it reserves the right to do so at any time. Except as otherwise permitted by the SEC, the Trust will give you 60 days’ advance notice if it exercises its right to terminate or materially modify the exchange privilege with respect to Class A and C shares.

The Guide provides more detailed information about the exchange privilege, including the procedures you must follow and additional exchange options. You can obtain a Guide free of charge from the Distributor by written request or by calling 1-800-426-0107. See “Allianz Funds and PIMCO Funds Shareholders’ Guide” above.

You can sell (redeem) Class A or Class C shares of the Fund in the following ways:

(1) a written request for redemption signed by all registered owners exactly as the account is registered on the Transfer Agent’s records, including fiduciary titles, if any, and specifying the account number and the dollar amount or number of shares to be redeemed;

(2) for certain redemptions described below, a guarantee of all signatures on the written request or on the share certificate or accompanying stock power, if required, as described under “Signature Guarantee” below;

(3) any share certificates issued for any of the shares to be redeemed (see “Certificated Shares” below); and

(4) any additional documents which may be required by the Transfer Agent for redemption by corporations, partnerships or other organizations, executors, administrators, trustees, custodians or guardians, or if the redemption is requested by anyone other than the shareholder(s) of record. Transfers of shares are subject to the same requirements.

A signature guarantee is not required for redemptions requested by and payable to all shareholders of record for the account, and to be sent to the address of record for that account. To avoid delay in redemption or transfer, if you have any questions about these requirements you should contact the Transfer Agent in writing or call 1-800-426-0107 before submitting a request. Written redemption or transfer requests will not be honored until all required documents in the proper form have been received by the Transfer Agent. You can not redeem your shares by written request if they are held in broker “street name” accounts—you must redeem through your broker.

If the proceeds of your redemption (i) are to be paid to a person other than the record owner, (ii) are to be sent to an address other than the address of the account on the Transfer Agent’s records, and/or (iii) are to be paid to a corporation, partnership, trust or fiduciary, the signature(s) on the redemption request and on the certificates, if any, or stock power must be guaranteed as described under “Signature Guarantee” below. The Distributor may, however, waive the signature guarantee requirement for redemptions up to $2,500 by a trustee of a qualified retirement plan, the administrator for which has an agreement with the Distributor.

The Guide describes a number of additional ways you can redeem your shares, including:

Unless you specifically elect otherwise, your initial account application permits you to redeem shares by telephone subject to certain requirements. To be eligible for ATS, expedited wire transfer, Automatic Withdrawal Plan, and Fund Link privileges, you must specifically elect the particular option on your account application and satisfy certain other requirements. The Guide describes each of these options and provides additional information about selling shares. You can obtain a Guide free of charge from the Distributor by written request or by calling 1-800-426-0107.

Other than an applicable CDSC, you will not pay any special fees or charges to the Trust or the Distributor when you sell your shares. However, if you sell your shares through your broker, dealer or other financial intermediary, that firm may charge you a commission or other fee for processing your redemption request.

Redemptions of Fund shares may be suspended when trading on the NYSE is restricted or during an emergency which makes it impracticable for the Fund to dispose of its securities or to determine fairly the value of its net assets, or during any other period as permitted by the SEC for the protection of investors. Under these and other unusual circumstances, the Trust may suspend redemptions or postpone payment for more than seven days, as permitted by law.

For shareholder protection, a request to change information contained in an account registration (for example, a request to change the bank designated to receive wire redemption proceeds) must be received in writing, signed by the minimum number of persons designated on the completed application that are required to effect a redemption, and accompanied by a signature guarantee from any eligible guarantor institution, as determined in accordance with the Trust’s procedures, as more fully described below. A signature guarantee cannot be provided by a notary public. In addition, corporations, trusts, and other institutional organizations are required to furnish evidence of the authority of the persons designated on the completed application to effect transactions for the organization.

Shareholders will be subject to a redemption fee on redemptions and exchanges equal to 2.00% of the NAV of Fund shares redeemed or exchanged (based on the total redemption proceeds after any applicable deferred sales charges) within 30 days after their acquisition (by purchase or exchange). Redemption fees are not imposed on exchanges between different classes of the Fund. With respect to any acquisition of shares, the holding period commences on the day of acquisition. A new holding period begins with each acquisition of shares through purchase or exchange.

In cases where redeeming shareholders hold shares acquired on different dates, the first-in/first-out (“FIFO”) method will be used to determine which shares are being redeemed, and therefore whether a redemption fee is payable. In cases where redemptions are processed through financial intermediaries, there may be a delay between the time the shareholder redeems his or her shares and the payment of the redemption fee to the Fund, depending upon such financial intermediaries’ trade processing procedures and systems.

A new time period begins with each acquisition of shares through a purchase or exchange. For example, for funds with a 30 day holding period, a series of transactions in which shares of Fund A are exchanged for shares of Fund B 20 days after the purchase of the Fund A shares, followed 20 days later by an exchange of the Fund B shares for shares of Fund C, will be subject to two redemption fees (one on each exchange).

The purpose of redemption fees is to deter excessive, short-term trading and other abusive trading practices as described above under “Abusive Trading Practices” and to help offset the costs associated with the sale of portfolio securities to satisfy redemption and exchange requests made by “market timers” and other short-term shareholders, thereby insulating longer-term shareholders from such costs. Redemption fees are not paid separately, but are deducted from the amount to be received in connection with a redemption or exchange. Redemption fees are paid to and retained by the Fund to defray certain costs described below and are not paid to or retained by PIMCO or the Distributor. Redemption fees are not sales loads or contingent deferred sales charges. Redemption and exchange of shares acquired through the reinvestment of dividends and distributions are not subject to redemption fees.

Limitations on the Assessment of Redemption Fees. The Fund may not be able to impose and/or collect the redemption fee in certain circumstances. For example, the Fund will not be able to collect the redemption fee on redemptions and exchanges by shareholders who invest through omnibus accounts at financial intermediaries (for example, brokers, dealers, banks, or other entities that hold Fund shares in nominee name, insurance companies that sponsor registered separate accounts organized as unit investment trusts, master-feeder funds, and certain fund-of-funds arrangements or, in the case of employee benefit plans, the plan administrators or plan recordkeepers) that currently do not have the capability to assess or collect the redemption fee, or that have not agreed to provide the information necessary for the Fund to assess and collect the redemption fee on such shareholders. The Fund may nonetheless continue to effect share transactions for such shareholders and financial intermediaries. By their nature, omnibus accounts, in which purchases and sales of Fund shares by multiple investors are aggregated for presentation to the Fund on a net basis, conceal the identity of the individual investors from the Fund. This makes it more difficult for the Fund to identify short-term transactions in the Fund, and makes assessment of the redemption fee on transactions effected through such accounts impractical without the assistance of the financial intermediary. Due to these limitations on the assessment of the redemption fee, the Fund’s use of redemption fees may not successfully reduce or eliminate excessive short-term trading in shares of the Fund or fully insulate long-term shareholders from associated costs or other dilution of the value of Fund shares.

Waivers of Redemption Fees. In the following situations, the Fund has elected not to impose the redemption fee:

Applicability of Redemption Fees in Certain Participant-Directed Retirement Plans. Redemption fees will not apply to the following transactions in participant-directed retirement plans (such as 401(k), 403(b), 457 and Keogh plans): 1) where the shares being redeemed were purchased with new contributions to the plan (e.g., payroll contributions, employer contributions, loan repayments); 2) redemptions made in connection with taking out a loan from the plan; 3) redemptions in connection with death, disability, forfeiture, hardship withdrawals, or Qualified Domestic Relations Orders; 4) redemptions made as part of a systematic withdrawal plan; 5) redemptions made by a defined contribution plan in connection with a termination or restructuring of the plan or 6) redemptions made in connection with a participant’s termination of employment. Redemption fees generally will apply to other participant-directed redemptions and exchanges. For example, if a participant exchanges shares of Fund A that were purchased with new contributions, into Fund B, a redemption fee would not apply to that exchange. However, any subsequent participant-directed exchange of those shares from Fund B into Fund A or another fund may be subject to redemption fees, depending upon the holding period and subject to the exceptions described in this paragraph (and other limitations on imposing redemption fees, as discussed above).

may be stricter than those described in this section. You should contact your plan sponsor, recordkeeper or financial intermediary for more information on any differences in how the redemption fee is applied to your investments in the Fund, and whether any additional restrictions, limitations or fees are imposed in connection with transactions in Fund shares.

The Trust may eliminate or modify the waivers enumerated above at any time, in its sole discretion. Shareholders will receive 60 days’ notice of any material changes to the redemption fee, unless otherwise permitted by law.

Redemption proceeds will normally be mailed to the redeeming shareholder within seven calendar days or, in the case of wire transfer or Fund Link redemptions, sent to the designated bank account within one business day. Fund Link redemptions may be received by the bank on the second or third business day. In cases where shares have recently been purchased by personal check, redemption proceeds may be withheld until the check has been collected, which may take up to 15 days. To avoid such withholding, investors should purchase shares by certified or bank check or by wire transfer.

The Trust will redeem shares of the Fund solely in cash up to the lesser of $250,000 or 1% of the Fund’s net assets during any 90-day period for any one shareholder. In consideration of the best interests of the remaining shareholders, the Trust may pay any redemption proceeds exceeding this amount in whole or in part by a distribution in kind of securities held by the Fund in lieu of cash. It is highly unlikely that your shares would ever be redeemed in kind. If your shares are redeemed in kind, you should expect to incur transaction costs upon the disposition of the securities received in the distribution.

If you are redeeming shares for which certificates have been issued, the certificates must be mailed to or deposited with the Trust, duly endorsed or accompanied by a duly endorsed stock power or by a written request for redemption. Signatures must be guaranteed as described under “Signature Guarantee” below. The Trust may request further documentation from institutions or fiduciary accounts, such as corporations, custodians (e.g., under the Uniform Gifts to Minors Act), executors, administrators, trustees or guardians. Your redemption request and stock power must be signed exactly as the account is registered, including indication of any special capacity of the registered owner.

When a signature guarantee is called for, a “medallion” signature guarantee will be required. A medallion signature guarantee may be obtained from a domestic bank or trust company, broker, dealer, clearing agency, savings association or other financial institution which is participating in a medallion program recognized by the Securities Transfer Association. The three recognized medallion programs are the Securities Transfer Agents Medallion Program, Stock Exchanges Medallion Program and New York Stock Exchange, Inc. Medallion Signature Program. Signature guarantees from financial institutions which are not participating in one of these programs will not be accepted. Please note that financial institutions participating in a recognized medallion program may still be ineligible to provide a signature guarantee for transactions of greater than a specified dollar amount. The Trust may change the signature guarantee requirements from time to time upon notice to shareholders, which may be given by means of a new or supplemented prospectus.

To help the government fight the funding of terrorism and money laundering activities, federal law requires all financial institutions to obtain, verify and record information that identifies each person that opens a new account, and to determine whether such person’s name appears on government lists of known or suspected terrorists and terrorist organizations. As a result, the Fund must obtain the following information for each person that opens a new account:

4. Social security number, taxpayer identification number, or other identifying number.

Federal law prohibits the Fund and other financial institutions from opening a new account unless they receive the minimum identifying information listed above.

Individuals may also be asked for a copy of their driver’s license, passport or other identifying document in order to verify their identity. In addition, it may be necessary to verify an individual’s identity by cross-referencing the identification information with a consumer report or other electronic database. Additional information may be required to open accounts for corporations and other entities.

After an account is opened, the Fund may restrict your ability to purchase additional shares until your identity is verified. The Fund also may close your account and redeem your shares or take other appropriate action if it is unable to verify your identity within a reasonable time.

To reduce expenses, it is intended that only one copy of the Fund’s prospectus and each annual and semi-annual report will be mailed to those addresses shared by two or more accounts. If you wish to receive individual copies of these documents and your shares are held directly with the Trust, call the Trust at 1-800-426-0107. Alternatively, if your shares are held through a financial institution, please contact it directly. Within thirty days after receipt of your request by the Trust, the Trust will begin sending you individual copies.

The Fund distributes substantially all of its net investment income to shareholders in the form of dividends. You begin earning dividends on Fund shares the day after the Trust receives your purchase payment. Dividends paid by the Fund with respect to each class of shares are calculated in the same manner and at the same time, but dividends on Class C shares are expected to be lower than dividends on Class A shares as a result of the distribution fees applicable to Class C shares. The Fund intends to declare and distribute income dividends monthly to shareholders of record.

In addition, the Fund distributes any net capital gains it earns from the sale of portfolio securities to shareholders no less frequently than annually. Net short-term capital gains may be paid more frequently.

You do not pay any sales charges on shares you receive through the reinvestment of Fund distributions.

If you elect to receive Fund distributions in cash and the postal or other delivery service is unable to deliver checks to your address of record, the Trust’s Transfer Agent will hold the returned checks for your benefit in a non-interest bearing account.

Fund dividends (i.e., distributions of investment income) are taxable to you as ordinary income. Federal taxes on Fund distributions of gains are determined by how long the Fund owned the investments that generated the gains, rather than how long you have owned your shares. Distributions of gains from investments that the Fund owned for more than one year will generally be taxable to you as long-term capital gains. Distributions of gains from investments that the Fund owned for one year or less will generally be taxable to you as ordinary income.

Fund distributions are taxable to you even if they are paid from income or gains earned by the Fund prior to your investment and thus were included in the price you paid for your shares. For example, if you purchase shares on or just before the record date of the Fund distribution, you will pay full price for the shares and may receive a portion of your investment back as a taxable distribution.

This section relates only to federal income tax; the consequences under other tax laws may differ. Shareholders should consult their tax advisors as to the possible application of foreign, state and local income tax laws to Fund dividends and capital distributions. Please see the Statement of Additional Information for additional information regarding the tax aspects of investing in the Fund.

This section provides additional information about some of the principal investments and related risks of the Fund described under “Summary Information” and “Summary of Principal Risks” above. It also describes characteristics and risks of additional securities and investment techniques that may be used by the Fund from time to time. Most of these securities and investment techniques are discretionary, which means that PIMCO can decide whether to use them or not. This prospectus does not attempt to disclose all of the various types of securities and investment techniques that may be used by the Fund. As with any mutual fund, investors in the Fund rely on the professional investment judgment and skill of PIMCO and the portfolio managers. Please see “Investment Objectives and Policies” in the Statement of Additional Information for more detailed information about the securities and investment techniques described in this section and about other strategies and techniques that may be used by the Fund.

In selecting securities for the Fund, PIMCO develops an outlook for interest rates, currency exchange rates and the economy; analyzes credit and call risks, and uses other security selection techniques. The proportion of the Fund’s assets committed to investment in securities with particular characteristics (such as quality, sector, interest rate or maturity) varies based on PIMCO’s outlook for the U.S. economy and the economies of other countries in the world, the financial markets and other factors.

PIMCO attempts to identify areas of the bond market that are undervalued relative to the rest of the market. PIMCO identifies these areas by grouping bonds into sectors such as money markets, governments, corporates, mortgages, asset-backed and international. Sophisticated proprietary software then assists in evaluating sectors and pricing specific securities. Once investment opportunities are identified, PIMCO will shift assets among sectors depending upon changes in relative valuations and credit spreads. There is no guarantee that PIMCO’s security selection techniques will produce the desired results.

U.S. Government Securities are obligations of, or guaranteed by, the U.S. Government, its agencies or government-sponsored enterprises. U.S. Government Securities are subject to market and interest rate risk, and may be subject to varying degrees of credit risk. U.S. Government Securities include zero coupon securities, which tend to be subject to greater market risk than interest-paying securities of similar maturities.

Municipal bonds are generally issued by states and local governments and their agencies, authorities and other instrumentalities. Municipal bonds are subject to interest rate, credit and market risk. The ability of an issuer to make payments could be affected by litigation, legislation or other political events or the bankruptcy of the issuer. Lower rated municipal bonds are subject to greater credit and market risk than higher quality municipal bonds. The types of municipal bonds in which the Fund may invest include municipal lease obligations. The Fund may also invest in securities issued by entities whose underlying assets are municipal bonds.

The Fund may invest, without limitation, in residual interest bonds, which are created by depositing municipal securities in a trust and dividing the income stream of an underlying municipal bond in two parts, one, a variable rate security and the other, a residual interest bond. The interest rate for the variable rate security is determined by an index or an auction process held approximately every 7 to 35 days, while the residual interest bond holder receives the balance of the income from the underlying municipal bond less an auction fee. The market prices of residual interest bonds may be highly sensitive to changes in market rates and may decrease significantly when market rates increase.

The Fund may invest in mortgage- or other asset-backed securities. The Fund may invest all of its assets in such securities. Mortgage-related securities include mortgage pass-through securities, collateralized mortgage obligations (“CMOs”), commercial mortgage-backed securities, mortgage dollar rolls, CMO residuals, stripped mortgage-backed securities (“SMBSs”) and other securities that directly or indirectly represent a participation in, or are secured by and payable from, mortgage loans on real property.

The value of some mortgage- or asset-backed securities may be particularly sensitive to changes in prevailing interest rates. Early repayment of principal on some mortgage-related securities may expose the Fund to a lower rate of return upon reinvestment of principal. When interest rates rise, the value of a mortgage-related security generally will decline; however, when interest rates are declining, the value of mortgage-related securities with prepayment features may not increase as much as other fixed income securities. The rate of prepayments on underlying mortgages will affect the price and volatility of a mortgage-related security, and may shorten or extend the effective maturity of the security beyond what was anticipated at the time of purchase. If unanticipated rates of prepayment on underlying mortgages increase the effective maturity of a mortgage-related security, the volatility of the security can be expected to increase. The value of these securities may fluctuate in response to the market’s perception of the creditworthiness of the issuers. Additionally, although mortgages and mortgage-related securities are generally supported by some form of government or private guarantee and/or insurance, there is no assurance that private guarantors or insurers will meet their obligations.

One type of SMBS has one class receiving all of the interest from the mortgage assets (the interest-only, or “IO” class), while the other class will receive all of the principal (the principal-only, or “PO” class). The yield to maturity on an IO class is extremely sensitive to the rate of principal payments (including prepayments) on the underlying mortgage assets, and a rapid rate of principal payments may have a material adverse effect on the Fund’s yield to maturity from these securities. The Fund may invest up to 5% of its total assets in any combination of mortgage-related or other asset-backed IO, PO, or inverse floater securities.

The Fund may invest in collateralized debt obligations (“CDOs”), which includes collateralized bond obligations (“CBOs”), collateralized loan obligations (“CLOs”) and other similarly structured securities. CBOs and CLOs are types of asset-backed securities. A CBO is a trust which is backed by a diversified pool of high-risk, below investment grade fixed income securities. A CLO is a trust typically collateralized by a pool of loans, which may include, among others, domestic and foreign senior secured loans, senior unsecured loans, and subordinate corporate loans, including loans that may be rated below investment grade or equivalent unrated loans. The Fund may invest in other asset-backed securities that have been offered to investors.

The Fund may invest in fixed- and floating-rate loans, which investments generally will be in the form of loan participations and assignments of portions of such loans. Participations and assignments involve special types of risk, including credit risk, interest rate risk, liquidity risk, and the risks of being a lender. If the Fund purchases a participation, it may only be able to enforce its rights through the lender, and may assume the credit risk of the lender in addition to the borrower.

perception of the creditworthiness of the issuer and general market liquidity. When interest rates rise, the value of corporate debt securities can be expected to decline. Debt securities with longer maturities tend to be more sensitive to interest rate movements than those with shorter maturities.

respect to the issuer’s continuing ability to meet principal and interest payments. They may also be more susceptible to real or perceived adverse economic and competitive industry conditions than higher-rated securities.

Variable and floating rate securities provide for a periodic adjustment in the interest rate paid on the obligations. The Fund may invest in floating rate debt instruments (“floaters”) and engage in credit spread trades. While floaters provide a certain degree of protection against rises in interest rates, the Fund will participate in any declines in interest rates as well. The Fund may also invest in inverse floating rate debt instruments (“inverse floaters”). An inverse floater may exhibit greater price volatility than a fixed rate obligation of similar credit quality. The Fund may invest up to 5% of its total assets in any combination of mortgage-related or other asset-backed IO, PO, or inverse floater securities.

Inflation-indexed bonds (other than municipal inflation-indexed bonds and certain corporate inflation-indexed bonds, which are more fully described below) are fixed income securities whose principal value is periodically adjusted according to the rate of inflation. If the index measuring inflation falls, the principal value of inflation-indexed bonds (other than municipal inflation-indexed bonds and certain corporate inflation-indexed bonds) will be adjusted downward, and consequently the interest payable on these securities (calculated with respect to a smaller principal amount) will be reduced. Repayment of the original bond principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-indexed bonds. For bonds that do not provide a similar guarantee, the adjusted principal value of the bond repaid at maturity may be less than the original principal.

With regard to municipal inflation-indexed bonds and certain corporate inflation-indexed bonds, the inflation adjustment is reflected in the semi-annual coupon payment. As a result, the principal value of municipal inflation-indexed bonds and such corporate inflation-indexed bonds does not adjust according to the rate of inflation.

The value of inflation-indexed bonds is expected to change in response to changes in real interest rates. Real interest rates are tied to the relationship between nominal interest rates and the rate of inflation. If nominal interest rates increase at a faster rate than inflation, real interest rates may rise, leading to a decrease in value of inflation-indexed bonds. Any increase in the principal amount of an inflation-indexed bond will be considered taxable ordinary income, even though investors do not receive their principal until maturity.

The Fund may obtain event-linked exposure by investing in “event-linked bonds” or “event-linked swaps” or implement “event-linked strategies.” Event-linked exposure results in gains or losses that typically are contingent, or formulaically related to defined trigger events. Examples of trigger events include hurricanes, earthquakes, weather-related phenomena, or statistics relating to such events. Some event-linked bonds are commonly referred to as “catastrophe bonds.” If a trigger event occurs, the Fund may lose a portion or its entire principal invested in the bond or notional amount on a swap. Event-linked exposure often provides for an extension of maturity to process and audit loss claims where a trigger event has, or possibly has, occurred. An extension of maturity may increase volatility. Event-linked exposure may also expose the Fund to certain unanticipated risks including credit risk, counterparty risk, adverse regulatory or jurisdictional interpretations, and adverse tax consequences. Event-linked exposures may also be subject to liquidity risk.

While the Fund intends to invest primarily in fixed income securities, it may invest in convertible securities or equity securities. Convertible securities are generally preferred stocks and other securities, including fixed income securities and warrants, that are convertible into or exercisable for common stock at a stated price or rate. The price of a convertible security will normally vary in some proportion to changes in the price of the underlying common stock because of this conversion or exercise feature. However, the value of a convertible security may not increase or decrease as rapidly as the underlying common stock. A convertible security will normally also provide income and is subject to interest rate risk. Convertible securities may be lower-rated securities subject to greater levels of credit risk. The Fund may be forced to convert a security before it would otherwise choose, which may have an adverse effect on the Fund’s ability to achieve its investment objectives.

While some countries or companies may be regarded as favorable investments, pure fixed income opportunities may be unattractive or limited due to insufficient supply, or legal or technical restrictions. In such cases, the Fund may consider convertible securities or equity securities to gain exposure to such investments.

At times, in connection with the restructuring of a Fixed Income Instrument either outside of bankruptcy court or in the context of bankruptcy court proceedings, the Fund may determine or be required to accept equity securities in exchange for all or a portion of a Fixed Income Instrument. Depending upon, among other things, PIMCO’s evaluation of the potential value of such securities in relation to the price that could be obtained by the Fund at any given time upon sale thereof, the Fund may determine to hold such securities in its portfolio.

Equity securities generally have greater price volatility than fixed income securities. The market price of equity securities owned by the Fund may go up or down, sometimes rapidly or unpredictably. Equity securities may decline in value due to factors affecting equity securities markets generally or particular industries represented in those markets. The value of an equity security may also decline for a number of reasons which directly relate to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or services.

The Fund may invest in foreign (non-U.S.) securities. Investing in foreign securities involves special risks and considerations not typically associated with investing in U.S. securities. Shareholders should consider carefully the substantial risks involved for funds that invest in securities issued by foreign companies and governments of foreign countries. These risks include: differences in accounting, auditing and financial reporting standards; generally higher commission rates on foreign portfolio transactions; the possibility of nationalization, expropriation or confiscatory taxation; adverse changes in investment or exchange control regulations; and political instability. Individual foreign economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rates of inflation, capital reinvestment, resources, self-sufficiency and balance of payments position. The securities markets, values of securities, yields and risks associated with foreign securities markets may change independently of each other. Also, foreign securities and dividends and interest payable on those securities may be subject to foreign taxes, including taxes withheld from payments on those securities. Foreign securities often trade with less frequency and volume than domestic securities and therefore may exhibit greater price volatility. Investments in foreign securities may also involve higher custodial costs than domestic investments and additional transaction costs with respect to foreign currency conversions. Changes in foreign exchange rates also will affect the value of securities denominated or quoted in foreign currencies.

The Fund also may invest in sovereign debt issued by governments, their agencies or instrumentalities, or other government-related entities. Holders of sovereign debt may be requested to participate in the rescheduling of such debt and to extend further loans to governmental entities. In addition, there is no bankruptcy proceeding by which defaulted sovereign debt may be collected.

• Emerging Market Securities. A security is economically tied to an emerging market country if it is principally traded on the country’s securities markets, or the issuer is organized or principally operates in the country, derives a majority of its income from its operations within the country, or has a majority of its assets in the country. PIMCO has broad discretion to identify and invest in countries that it considers to qualify as emerging securities markets. However, an emerging securities market is generally considered to be one located in any country that is defined as an emerging or developing economy by the World Bank or its related organizations, or the United Nations or its authorities. In making investments in emerging market securities, the Fund emphasizes countries with relatively low gross national product per capita and with the potential for rapid economic growth. PIMCO will select the country and currency composition based on its evaluation of relative interest rates, inflation rates, exchange rates, monetary and fiscal policies, trade and current account balances, and any other specific factors it believes to be relevant.

Investing in emerging market securities imposes risks different from, or greater than, risks of investing in domestic securities or in foreign, developed countries. These risks include: smaller market capitalization of securities markets, which may suffer periods of relative illiquidity; significant price volatility; restrictions on foreign investment; possible repatriation of investment income and capital. In addition, foreign investors may be required to register the proceeds of sales; future economic or political crises could lead to price controls, forced mergers, expropriation or confiscatory taxation, seizure, nationalization, or creation of government monopolies. The currencies of emerging market countries may experience significant declines against the U.S. dollar, and devaluation may occur subsequent to investments in these currencies by the Fund. Inflation and rapid fluctuations in inflation rates have had, and may continue to have, negative effects on the economies and securities markets of certain emerging market countries.

regulation; unavailability of currency hedging techniques; companies that are newly organized and small; differences in auditing and financial reporting standards, which may result in unavailability of material information about issuers; and less developed legal systems. In addition, emerging securities markets may have different clearance and settlement procedures, which may be unable to keep pace with the volume of securities transactions or otherwise make it difficult to engage in such transactions. Settlement problems may cause the Fund to miss attractive investment opportunities, hold a portion of its assets in cash pending investment, or be delayed in disposing of a portfolio security. Such a delay could result in possible liability to a purchaser of the security.

The Fund may invest in Brady Bonds, which are securities created through the exchange of existing commercial bank loans to sovereign entities for new obligations in connection with a debt restructuring. Investments in Brady Bonds may be viewed as speculative. Brady Bonds acquired by the Fund may be subject to restructuring arrangements or to requests for new credit, which may cause the Fund to suffer a loss of interest or principal on any of its holdings.

The Fund may invest directly in foreign currencies or in securities that trade in, or receive revenues in, foreign currencies and therefore will be subject to currency risk. Foreign currency exchange rates may fluctuate significantly over short periods of time. They generally are determined by supply and demand in the foreign exchange markets and the relative merits of investments in different countries, actual or perceived changes in interest rates and other complex factors. Currency exchange rates also can be affected unpredictably by intervention (or the failure to intervene) by U.S. or foreign governments or central banks, or by currency controls or political developments.

• Foreign Currency Transactions. The Fund may engage in foreign currency transactions on a spot (cash) basis, and enter into forward foreign currency exchange contracts and invest in foreign currency futures contracts and options on foreign currencies and futures. A forward foreign currency exchange contract, which involves an obligation to purchase or sell a specific currency at a future date at a price set at the time of the contract, reduces the Fund’s exposure to changes in the value of the currency it will deliver and increases its exposure to changes in the value of the currency it will receive for the duration of the contract. Certain foreign currency transactions may also be settled in cash rather than the actual delivery of the relevant currency. The effect on the value of the Fund is similar to selling securities denominated in one currency and purchasing securities denominated in another currency. A contract to sell foreign currency would limit any potential gain which might be realized if the value of the hedged currency increases. The Fund may enter into these contracts to hedge against foreign exchange risk, to increase exposure to a foreign currency or to shift exposure to foreign currency fluctuations from one currency to another. Suitable hedging transactions may not be available in all circumstances and there can be no assurance that the Fund will engage in such transactions at any given time or from time to time. Also, such transactions may not be successful and may eliminate any chance for the Fund to benefit from favorable fluctuations in relevant foreign currencies. The Fund may use one currency (or a basket of currencies) to hedge against adverse changes in the value of another currency (or a basket of currencies) when exchange rates between the two currencies are positively correlated. The Fund will segregate or “earmark” assets determined to be liquid by PIMCO in accordance with the procedures established by the Board of Trustees (or, as permitted by applicable law, enter into certain offsetting positions) to cover its obligations under forward foreign currency exchange contracts entered into for non-hedging purposes.

The Fund may enter into repurchase agreements, in which the Fund purchases a security from a bank or broker-dealer, which agrees to repurchase the security at the Fund’s cost plus interest within a specified time. If the party agreeing to repurchase should default, the Fund will seek to sell the securities which it holds. This could involve procedural costs or delays in addition to a loss on the securities if their value should fall below their repurchase price. Repurchase agreements maturing in more than seven days are considered illiquid securities.

The Fund may enter into reverse repurchase agreements and dollar rolls, subject to the Fund’s limitations on borrowings. A reverse repurchase agreement or dollar roll involves the sale of a security by the Fund and its agreement to repurchase the instrument at a specified time and price, and may be considered a form of borrowing for some purposes. The Fund will segregate assets determined to be liquid by PIMCO or otherwise to cover its obligations under reverse repurchase agreements, dollar rolls, and other borrowings. Reverse repurchase agreements, dollar rolls and other forms of borrowings may create leveraging risk for the Fund.

The Fund may borrow money to the extent permitted under the 1940 Act. This means that, in general, the Fund may borrow money from banks for any purpose on a secured basis in an amount up to ¹/3 of the Fund’s total assets. The Fund may also borrow money for temporary administrative purposes on an unsecured basis in an amount not to exceed 5% of the Fund’s total assets.

The Fund may, but is not required to, use derivative instruments for risk management purposes or as part of its investment strategies. Generally, derivatives are financial contracts whose value depends upon, or is derived from, the value of an underlying asset, reference rate or index, and may relate to stocks, bonds, interest rates, currencies or currency exchange rates, commodities, and related indexes. Examples of derivative instruments include options contracts, futures contracts, options on futures contracts and swap agreements (including, but not limited to, credit default swaps and swaps on exchange traded funds). The Fund may invest some or all of its assets in derivative instruments. The portfolio managers may decide not to employ any of these strategies and there is no assurance that any derivatives strategy used by the Fund will succeed. A description of these and other derivative instruments that the Fund may use are described under “Investment Objectives and Policies” in the Statement of Additional Information.

The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other more traditional investments. A description of various risks associated with particular derivative instruments is included in “Investment Objectives and Policies” in the Statement of Additional Information. The following provides a more general discussion of important risk factors relating to all derivative instruments that may be used by the Fund.

Management Risk. Derivative products are highly specialized instruments that require investment techniques and risk analyses different from those associated with stocks and bonds. The use of a derivative requires an understanding not only of the underlying instrument but also of the derivative itself, without the benefit of observing the performance of the derivative under all possible market conditions.

Credit Risk. The use of a derivative instrument involves the risk that a loss may be sustained as a result of the failure of another party to the contract (usually referred to as a “counterparty”) to make required payments or otherwise comply with the contract’s terms. Additionally, credit default swaps could result in losses if the Fund does not correctly evaluate the creditworthiness of the company on which the credit default swap is based.

Liquidity Risk. Liquidity risk exists when a particular derivative instrument is difficult to purchase or sell. If a derivative transaction is particularly large or if the relevant market is illiquid (as is the case with many privately negotiated derivatives), it may not be possible to initiate a transaction or liquidate a position at an advantageous time or price.

Leverage Risk. Because many derivatives have a leverage component, adverse changes in the value or level of the underlying asset, reference rate or index can result in a loss substantially greater than the amount invested in the derivative itself. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. When the Fund uses derivatives for leverage, investments in the Fund will tend to be more volatile, resulting in larger gains or losses in response to market changes. To limit leverage risk, the Fund will segregate or “earmark” assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees (or, as permitted by applicable regulation, enter into certain offsetting positions) to cover its obligations under derivative instruments.

Lack of Availability. Because the markets for certain derivative instruments (including markets located in foreign countries) are relatively new and still developing, suitable derivatives transactions may not be available in all circumstances for risk management or other purposes. Upon the expiration of a particular contract, the portfolio managers may wish to retain the Fund’s position in the derivative instrument by entering into a similar contract, but may be unable to do so if the counterparty to the original contract is unwilling to enter into the new contract and no other suitable counterparty can be found. There is no assurance that the Fund will engage in derivatives transactions at any time or from time to time. The Fund’s ability to use derivatives may also be limited by certain regulatory and tax considerations.

Market and Other Risks. Like most other investments, derivative instruments are subject to the risk that the market value of the instrument will change in a way detrimental to the Fund’s interest. If the portfolio managers incorrectly forecast the values of securities, currencies or interest rates or other economic factors in using derivatives for the Fund, the Fund might have been in a better position if it had not entered into the transaction at all. While some strategies involving derivative instruments can reduce the risk of loss, they can also reduce the opportunity for gain or even result in losses by offsetting favorable price movements in other Fund investments. The Fund may also have to buy or sell a security at a disadvantageous time or price because the Fund is legally required to maintain offsetting positions or asset coverage in connection with certain derivatives transactions.

Other risks in using derivatives include the risk of mispricing or improper valuation of derivatives and the inability of derivatives to correlate perfectly with underlying assets, rates and indexes. Many derivatives, in particular privately negotiated derivatives, are complex and often valued subjectively. Improper valuations can result in increased cash payment requirements to counterparties or a loss of value to the Fund. Also, the value of derivatives may not correlate perfectly, or at all, with the value of the assets, reference rates or indexes they are designed to closely track. For example, a swap agreement on an exchange traded fund would not correlate perfectly with the index upon which the exchange traded fund is based because the fund’s return is net of fees and expenses. In addition, the Fund’s use of derivatives may cause the Fund to realize higher amounts of short-term capital gains (generally taxed at ordinary income tax rates) than if the Fund had not used such instruments.

The Fund may also enter into, or acquire participations in, delayed funding loans and revolving credit facilities, in which a lender agrees to make loans up to a maximum amount upon demand by the borrower during a specified term. These commitments may have the effect of requiring the Fund to increase its investment in a company at a time when it might not otherwise decide to do so (including at a time when the company’s financial condition makes it unlikely that such amounts will be repaid). To the extent that the Fund is committed to advance additional funds, it will segregate or “earmark” assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees in an amount sufficient to meet such commitments. Delayed funding loans and revolving credit facilities are subject to credit, interest rate and liquidity risk and the risks of being a lender.

The Fund may purchase securities which it is eligible to purchase on a when-issued basis, may purchase and sell such securities for delayed delivery and may make contracts to purchase such securities for a fixed price at a future date beyond normal settlement time (forward commitments). When-issued transactions, delayed delivery purchases and forward commitments involve a risk of loss if the value of the securities declines prior to the settlement date. This risk is in addition to the risk that the Fund’s other assets will decline in value. Therefore, these transactions may result in a form of leverage and increase the Fund’s overall investment exposure. Typically, no income accrues on securities the Fund has committed to purchase prior to the time delivery of the securities is made, although the Fund may earn income on securities it has segregated or “earmarked” to cover these positions.

The Fund may invest up to 10% of its total assets in securities of other investment companies, such as open-end or closed-end management investment companies, or in pooled accounts or other investment vehicles which invest in foreign markets. As a shareholder of an investment company, the Fund may indirectly bear service and other fees which are in addition to the fees the Fund pays its service providers.

Subject to the restrictions and limitations of the 1940 Act, the Fund may elect to pursue its investment objectives either by investing directly in securities, or by investing in one or more underlying investment vehicles or companies that have substantially similar investment objectives and policies as the Fund. The Fund may also invest in exchange traded funds, subject to the restrictions and limitations of the 1940 Act.

The Fund may make short sales as part of its overall portfolio management strategies or to offset a potential decline in value of a security. A short sale involves the sale of a security that is borrowed from a broker or other institution to complete the sale. Short sales expose the Fund to the risk that it will be required to acquire, convert or exchange securities to replace the borrowed securities (also known as “covering” the short position) at a time when the securities sold short have appreciated in value, thus resulting in a loss to the Fund. The Fund making a short sale must segregate or “earmark” assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees or otherwise cover its position in a permissible manner.

The Fund may invest up to 15% of its net assets in illiquid securities. Certain illiquid securities may require pricing at fair value as determined in good faith under the supervision of the Board of Trustees. The portfolio managers may be subject to significant delays in disposing of illiquid securities, and transactions in illiquid securities may entail registration expenses and other transaction costs that are higher than those for transactions in liquid securities. The term “illiquid securities” for this purpose means securities that cannot be disposed of within seven days in the ordinary course of business at approximately the amount at which the Fund has valued the securities. Restricted securities, i.e., securities subject to legal or contractual restrictions on resale, may be illiquid. However, some restricted securities (such as securities issued pursuant to Rule 144A under the Securities Act of 1933, as amended, and certain commercial paper) may be treated as liquid, although they may be less liquid than registered securities traded on established secondary markets.

For the purpose of achieving income, the Fund may lend its portfolio securities to brokers, dealers, and other financial institutions provided a number of conditions are satisfied, including that the loan is fully collateralized. Please see “Investment Objectives and Policies” in the Statement of Additional Information for details. When the Fund lends portfolio securities, its investment performance will continue to reflect changes in the value of the securities loaned, and the Fund will also receive a fee or interest on the collateral. Securities lending involves the risk of loss of rights in the collateral or delay in recovery of the collateral if the borrower fails to return the security loaned or becomes insolvent. The Fund may pay lending fees to a party arranging the loan.

The length of time the Fund has held a particular security is not generally a consideration in investment decisions. A change in the securities held by the Fund is known as “portfolio turnover.” The Fund may engage in frequent and active trading of portfolio securities to achieve its investment objectives, particularly during periods of volatile market movements. High portfolio turnover (e.g., over 100%) involves correspondingly greater expenses to the Fund, including brokerage commissions or dealer mark-ups and other transaction costs on the sale of securities and reinvestments in other securities. Such sales may also result in realization of taxable capital gains, including short-term capital gains (which are generally taxed at ordinary income tax rates). The trading costs and tax effects associated with portfolio turnover may adversely affect the Fund’s performance.

For temporary or defensive purposes, the Fund may invest without limit in U.S. debt securities, including taxable securities and short-term money market securities, when PIMCO deems it appropriate to do so. When the Fund engages in such strategies, it may not achieve its investment objectives.

The investment objectives of the Fund are non-fundamental and may be changed by the Board of Trustees without shareholder approval. Unless otherwise stated, all investment policies of the Fund may be changed by the Board of Trustees without shareholder approval.

Unless otherwise stated, all percentage limitations on Fund investments listed in this prospectus will apply at the time of investment. The Fund would not violate these limitations unless an excess or deficiency occurs or exists immediately after and as a result of an investment.

Rating agencies are private services that provide ratings of the credit quality of fixed income securities, including convertible securities. Appendix A to this prospectus describes the various ratings assigned to fixed income securities by Moody’s and S&P. Ratings assigned by a rating agency are not absolute standards of credit quality and do not evaluate market risks. Rating agencies may fail to make timely changes in credit ratings and an issuer’s current financial condition may be better or worse than a rating indicates. The Fund will not necessarily sell a security when its rating is reduced below its rating at the time of purchase. PIMCO does not rely solely on credit ratings, and develops its own analysis of issuer credit quality.

The Fund may purchase unrated securities (which are not rated by a rating agency) if a portfolio manager determines that the security is of comparable quality to a rated security that the Fund may purchase. Unrated securities may be less liquid than comparable rated securities and involve the risk that the portfolio managers may not accurately evaluate the security’s comparative credit rating. Analysis of the creditworthiness of issuers of high yield securities may be more complex than for issuers of higher- quality fixed income securities. To the extent that the Fund invests in high yield and/or unrated securities, the Fund’s success in achieving its investment objectives may depend more heavily on the portfolio managers’ creditworthiness analysis than if the Fund invested exclusively in higher-quality and rated securities.

The Fund may invest in other types of securities and use a variety of investment techniques and strategies which are not described in this prospectus. These securities and techniques may subject the Fund to additional risks. Please see the Statement of Additional Information for additional information about the securities and investment techniques described in this prospectus and about additional securities and techniques that may be used by the Fund.

Because the Fund has not commenced operations as of the date of this prospectus, audited financial highlights are not available.

The Fund’s investments may range in quality from securities rated in the lowest category in which the Fund is permitted to invest to securities rated in the highest category (as rated by Moody’s or S&P or, if unrated, determined by PIMCO to be of comparable quality). The percentage of the Fund’s assets invested in securities in a particular rating category will vary. The following terms are generally used to describe the credit quality of fixed income securities:

High Quality Debt Securities are those rated in one of the two highest rating categories (the highest category for commercial paper) or, if unrated, deemed comparable by PIMCO.

Investment Grade Debt Securities are those rated in one of the four highest rating categories or, if unrated, deemed comparable by PIMCO.

Below Investment Grade, High Yield Securities (“Junk Bonds”) are those rated lower than Baa by Moody’s or BBB by S&P and comparable securities. They are considered predominantly speculative with respect to the issuer’s ability to repay principal and interest.

The following is a description of Moody’s and S&P’s rating categories applicable to fixed income securities.

Aaa: Bonds which are rated Aaa are judged to be of the best quality. They carry the smallest degree of investment risk and are generally referred to as “gilt edge.” Interest payments are protected by a large or by an exceptionally stable margin and principal is secure. While the various protective elements are likely to change, such changes as can be visualized are most unlikely to impair the fundamentally strong position of such issues.

Aa: Bonds which are rated Aa are judged to be of high quality by all standards. Together with the Aaa group they comprise what are generally known as high-grade bonds. They are rated lower than the best bonds because margins of protection may not be as large as in Aaa securities or fluctuation of protective elements may be of greater amplitude or there may be other elements present that make the long-term risks appear somewhat larger than with Aaa securities.

A: Bonds which are rated A possess many favorable investment attributes and are to be considered as upper-medium-grade obligations. Factors giving security to principal and interest are considered adequate but elements may be present that suggest a susceptibility to impairment sometime in the future.

Baa: Bonds which are rated Baa are considered as medium-grade obligations (i.e., they are neither highly protected nor poorly secured). Interest payments and principal security appear adequate for the present but certain protective elements may be lacking or may be characteristically unreliable over any great length of time. Such bonds lack outstanding investment characteristics and in fact have speculative characteristics as well.

Ba: Bonds which are rated Ba are judged to have speculative elements; their future cannot be considered as well-assured. Often the protection of interest and principal payments may be very moderate and thereby not well safeguarded during both good and bad times over the future. Uncertainty of position characterizes bonds in this class.

B: Bonds which are rated B generally lack characteristics of a desirable investment. Assurance of interest and principal payments or of maintenance of other terms of the contract over any long period of time may be small.

Caa: Bonds which are rated Caa are of poor standing. Such issues may be in default or there may be present elements of danger with respect to principal or interest.

Ca: Bonds which are rated Ca represent obligations which are speculative in a high degree. Such issues are often in default or have other marked shortcomings.

C: Bonds which are rated C are the lowest rated class of bonds and issues so rated can be regarded as having extremely poor prospects of ever attaining any real investment standing.

Moody’s applies numerical modifiers, 1, 2, and 3 in each generic rating classified from Aa through Caa in its corporate bond rating system. The modifier 1 indicates that the security ranks in the higher end of its generic rating category; the modifier 2 indicates a mid-range ranking; and the modifier 3 indicates that the issue ranks in the lower end of its generic rating category.

Moody’s short-term debt ratings are opinions of the ability of issuers to repay punctually senior debt obligations which have an original maturity not exceeding one year. Obligations relying upon support mechanisms such as letters of credit and bonds of indemnity are excluded unless explicitly rated.

Moody’s employs the following three designations, all judged to be investment grade, to indicate the relative repayment ability of rated issuers:

PRIME-1: Issuers rated Prime-1 (or supporting institutions) have a superior ability for repayment of senior short-term debt obligations. Prime-1 repayment ability will often be evidenced by many of the following characteristics: leading market positions in well-established industries; high rates of return on funds employed; conservative capitalization structure with moderate reliance on debt and ample asset protection; broad margins in earnings coverage of fixed financial charges and high internal cash generation; and well-established access to a range of financial markets and assured sources of alternate liquidity.

PRIME-2: Issuers rated Prime-2 (or supporting institutions) have a strong ability for repayment of senior short-term debt obligations. This will normally be evidenced by many of the characteristics cited above but to a lesser degree. Earnings trends and coverage ratios, while sound, may be more subject to variation. Capitalization characteristics, while still appropriate, may be more affected by external conditions. Ample alternate liquidity is maintained.

PRIME-3: Issuers rated Prime-3 (or supporting institutions) have an acceptable ability for repayment of senior short-term obligations. The effect of industry characteristics and market compositions may be more pronounced. Variability in earnings and profitability may result in changes in the level of debt protection measurements and may require relatively high financial leverage. Adequate alternate liquidity is maintained.

NOT PRIME: Issuers rated Not Prime do not fall within any of the Prime rating categories.

There are three rating categories for short-term municipal bonds that define an investment grade situation, which are listed below. In the case of variable rate demand obligations (VRDOs), a two-component rating is assigned. The first element represents an evaluation of the degree of risk associated with scheduled principal and interest payments, and the other represents an evaluation of the degree of risk associated with the demand feature. The short-term rating assigned to the demand feature of VRDOs is designated as VMIG. When either the long- or short-term aspect of a VRDO is not rated, that piece is designated NR, e.g., Aaa/NR or NR/VMIG 1. MIG ratings terminate at the retirement of the obligation while VMIG rating expiration will be a function of each issue’s specific structural or credit features.

MIG 1/VMIG 1: This designation denotes superior quality. There is present strong protection by established cash flows, superior liquidity support or demonstrated broad-based access to the market for refinancing.

MIG 2/VMIG 2: This designation denotes strong quality. Margins of protection are ample although not so large as in the preceding group.

MIG 3/VMIG 3: This designation denotes acceptable quality. All security elements are accounted for but there is lacking the undeniable strength of the preceding grades. Liquidity and cash flow protection may be narrow and market access for refinancing is likely to be less well established.

SG: This designation denotes speculative quality. Debt instruments in this category lack margins of protection.

AAA: Debt rated AAA has the highest rating assigned by S&P. Capacity to pay interest and repay principal is extremely strong.

AA: Debt rated AA has a very strong capacity to pay interest and repay principal and differs from the highest rated issues only in small degree.

A: Debt rated A has a strong capacity to pay interest and repay principal although it is somewhat more susceptible to the adverse effects of changes in circumstances and economic conditions than debt in higher rated categories.

BBB: Debt rated BBB is regarded as having an adequate capacity to pay interest and repay principal. Whereas it normally exhibits adequate protection parameters, adverse economic conditions, or changing circumstances are more likely to lead to a weakened capacity to pay interest and repay principal for debt in this category than in higher-rated categories.

Debt rated BB, B, CCC, CC, and C is regarded as having predominantly speculative characteristics with respect to capacity to pay interest and repay principal. BB indicates the least degree of speculation and C the highest. While such debt will likely have some quality and protective characteristics, these are outweighed by large uncertainties or major exposures to adverse conditions.

BB: Debt rated BB has less near-term vulnerability to default than other speculative issues. However, it faces major ongoing uncertainties or exposure to adverse business, financial, or economic conditions which could lead to inadequate capacity to meet timely interest and principal payments. The BB rating category is also used for debt subordinated to senior debt that is assigned an actual or implied BBB- rating.

B: Debt rated B has a greater vulnerability to default but currently has the capacity to meet interest payments and principal repayments. Adverse business, financial, or economic conditions will likely impair capacity or willingness to pay interest and repay principal. The B rating category is also used for debt subordinated to senior debt that is assigned an actual or implied BB or BB- rating.

CCC: Debt rated CCC has a currently identifiable vulnerability to default and is dependent upon favorable business, financial, and economic conditions to meet timely payment of interest and repayment of principal. In the event of adverse business, financial or economic conditions, it is not likely to have the capacity to pay interest and repay principal. The CCC rating category is also used for debt subordinated to senior debt that is assigned an actual or implied B or B- rating.

CC: The rating CC is typically applied to debt subordinated to senior debt that is assigned an actual or implied CCC rating.

C: The rating C is typically applied to debt subordinated to senior debt that is assigned an actual or implied CCC- debt rating. The C rating may be used to cover a situation where a bankruptcy petition has been filed, but debt service payments are continued.

CI: The rating CI is reserved for income bonds on which no interest is being paid.

D: Debt rated D is in payment default. The D rating category is used when interest payments or principal payments are not made on the date due even if the applicable grace period has not expired, unless S&P believes that such payments will be made during such grace period. The D rating will also be used upon the filing of a bankruptcy petition if debt service payments are jeopardized.

Plus (+) or Minus (-): The ratings from AA to CCC may be modified by the addition of a plus or minus sign to show relative standing within the major rating categories.

Provisional ratings: The letter “p” indicates that the rating is provisional. A provisional rating assumes the successful completion of the project being financed by the debt being rated and indicates that payment of debt service requirements is largely or entirely dependent upon the successful and timely completion of the project. This rating, however, while addressing credit quality subsequent to completion of the project, makes no comment on the likelihood of, or the risk of default upon failure of, such completion. The investor should exercise his own judgment with respect to such likelihood and risk.

r: The “r” is attached to highlight derivative, hybrid, and certain other obligations that S&P believes may experience high volatility or high variability in expected returns due to non-credit risks. Examples of such obligations are: securities whose principal or interest return is indexed to equities, commodities, or currencies; certain swaps and options; and interest only and principal only mortgage securities.

The absence of an “r” symbol should not be taken as an indication that an obligation will exhibit no volatility or variability in total return.

Debt obligations of issuers outside the United States and its territories are rated on the same basis as domestic corporate and municipal issues. The ratings measure the creditworthiness of the obligor but do not take into account currency exchange and related uncertainties.

An S&P commercial paper rating is a current assessment of the likelihood of timely payment of debt having an original maturity of no more than 365 days. Ratings are graded into several categories, ranging from A for the highest quality obligations to D for the lowest. These categories are as follows:

A-1: This highest category indicates that the degree of safety regarding timely payment is strong. Those issues determined to possess extremely strong safety characteristics are denoted with a plus sign (+) designation.

A-2: Capacity for timely payment on issues with this designation is satisfactory. However, the relative degree of safety is not as high as for issues designated A-1.

A-3: Issues carrying this designation have adequate capacity for timely payment. They are, however, more vulnerable to the adverse effects of changes in circumstances than obligations carrying the higher designations.

B: Issues rated B are regarded as having only speculative capacity for timely payment.

C: This rating is assigned to short-term debt obligations with a doubtful capacity for payment.

D: Debt rated D is in payment default. The D rating category is used when interest payments or principal payments are not made on the date due, even if the applicable grace period has not expired, unless S&P believes that such payments will be made during such grace period.

A commercial paper rating is not a recommendation to purchase, sell or hold a security inasmuch as it does not comment as to market price or suitability for a particular investor. The ratings are based on current information furnished to S&P by the issuer or obtained from other sources it considers reliable. S&P does not perform an audit in connection with any rating and may, on occasion, rely on unaudited financial information. The ratings may be changed, suspended, or withdrawn as a result of changes in or unavailability of such information.

The Trust’s Statement of Additional Information (“SAI”) includes additional information about the Fund. The SAI is incorporated by reference into this prospectus, which means it is part of this prospectus for legal purposes.

The SAI includes the Allianz Funds and PIMCO Funds Shareholders’ Guide for Class A, B, C and R Shares, a separate booklet which contains more detailed information about Fund purchase, redemption and exchange options and procedures and other information about the Fund. You can get a free copy of the Guide together with or separately from the rest of the SAI.

The Fund’s annual report, once it is available, will discuss the market conditions and investment strategies that significantly affected the Fund’s performance during its last fiscal year.

You may get free copies of the SAI, the Fund’s annual or semi-annual report (once available), request other information about the Fund, or make shareholder inquiries by calling the Trust at 1-800-426-0107, or PIMCO Infolink Audio Response Network at 1-800-987-4626, or by writing to:

You may review and copy information about the Trust, including its SAI, at the Securities and Exchange Commission’s public reference room in Washington, D.C. You may call the Commission at 1-202-551-8090 for information about the operation of the public reference room. You may also access reports and other information about the Trust on the Commission’s Web site at www.sec.gov. You may get copies of this information, with payment of a duplication fee, by writing the Public Reference Section of the Commission, Washington, D.C. 20549-0102, or by e-mailing your request to publicinfo@sec.gov.

You can also visit our Web site at www.allianzinvestors.com for additional information about the Fund, including the SAI, which is available for download free of charge.

Allianz Global Investors Distributors LLC, 2187 Atlantic Street, Stamford, CT 06902-6896

For further information about the PIMCO Funds, call 1-800-426-0107 or visit our Web site at www.allianzinvestors.com.

Allianz Global Investors is one of the world’s largest asset management companies, with over $1 trillion under management. Our investment solutions—including the PIMCO Funds and Allianz Funds, separately managed accounts and closed-end funds—offer access to a premier group of institutional investment firms, carefully assembled by Allianz to represent a broad spectrum of asset classes and investment styles.

Investors should consider the investment objectives, risks, charges and expenses of any mutual fund carefully before investing. This and other information is contained in the fund’s prospectus, which may be obtained by contacting your financial advisor. Please read the prospectus carefully before you invest or send money.

Assets under management as of 12/31/05. Allianz Global Investors Fund Management LLC serves as the Closed-End Funds’ investment manager, and the sub-advisors are Pacific Investment Management Company LLC (PIMCO), Oppenheimer Capital LLC (OPCAP), Nicholas Applegate Capital Management LLC (NACM) and NFJ Investment Group L.P. (NFJ). Managed accounts are available through Allianz Global Investors Managed Accounts LLC, 1345 Avenue of the Americas, New York, NY 10105-4800. The funds are distributed by Allianz Global Investors Distributors LLC, 2187 Atlantic Street, Stamford, CT 06902 ^© 2006. For information about any product, contact your financial advisor.AZ090_16779

This prospectus describes the PIMCO Income Fund (the “Fund”) offered by PIMCO Funds (the “Trust”). The Fund provides access to the professional investment advisory services offered by Pacific Investment Management Company LLC (“PIMCO”). As of September 30, 2006, PIMCO managed approximately $641 billion in assets. The firm’s institutional heritage is reflected in the PIMCO Fund offered in this prospectus.

The Fund offers Class D shares in this prospectus. This prospectus explains what you should know about the Fund before you invest. Please read it carefully.

Consistent with the Fund’s investment policies, the Fund invests in “Fixed Income Instruments,” which as used generally in this prospectus includes:

Securities issued by U.S. Government agencies or government-sponsored enterprises may not be guaranteed by the U.S. Treasury.

An investment in the Fund is not a deposit of a bank and is not guaranteed or insured by the Federal Deposit Insurance Corporation or any other government agency.

The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are:

Please see “Summary of Principal Risks” following the Fund Summary for a description of these and other risks of investing in the Fund.

The Fund does not have a full calendar year of performance. Thus, no bar chart or annual returns table is included for the Fund.

These tables describe the fees and expenses you may pay if you buy and hold Class D shares of the Fund:

Examples. The Examples are intended to help you compare the cost of investing in Class D shares of the Fund with the costs of investing in other mutual funds. The Examples assume that you invest $10,000 in the noted class of shares for the time periods indicated, and then redeem all your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, the reinvestment of all dividends and distributions, and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, the Examples show what your costs would be based on these assumptions.

The Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivatives contract, repurchase agreement or a loan of portfolio securities, is unable or unwilling to make timely principal and/or interest payments, or to otherwise honor its obligations. Securities are subject to varying degrees of credit risk, which are often reflected in credit ratings. Municipal bonds are subject to the risk that litigation, legislation or other political events, local business or economic condition, or the bankruptcy of the issuer could have a significant effect on an issuer’s ability to make payments of principal and/or interest.

strategy designed to reduce exposure to other risks, such as interest rate or currency risk. The Fund may also use derivatives for leverage, in which case their use would involve leveraging risk. The Fund’s use of derivative instruments involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other traditional investments. Derivatives are subject to a number of risks described elsewhere in this section, such as liquidity risk, interest rate risk, market risk, credit risk and management risk. They also involve the risk of mispricing or improper valuation and the risk that changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index. If the Fund invests in a derivative instrument, it could lose more than the principal amount invested. Also, suitable derivative transactions may not be available in all circumstances and there can be no assurance that the Fund will engage in these transactions to reduce exposure to other risks when that would be beneficial.

Focusing investments in a small number of issuers, industries or foreign currencies increases risk. The Fund is “non-diversified”, which means that it may invest a greater percentage of its assets in the securities of a single issuer (such as bonds issued by a particular state) than funds that are “diversified.” Funds that invest in a relatively small number of issuers are more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified fund might be. Some of those issuers also may present substantial credit or other risks. Similarly, the Fund may be more sensitive to adverse economic, business or political developments if it invests a substantial portion of its assets in the bonds of similar projects or from issuers in the same state.

to leverage risk by borrowing money for investment purposes. The use of leverage may cause the Fund to liquidate portfolio positions to satisfy obligations or to meet segregation requirements when it may not be advantageous to do so. Leverage, including borrowing, may cause the Fund to be more volatile than if the Fund had not been leveraged. This is because leverage tends to exaggerate the effect of any increase or decrease in the value of the Fund’s portfolio securities.

The Fund pays for the administrative services it requires under what is essentially an all-in fee structure. Class D shareholders of the Fund pay an administrative fee to PIMCO, computed as a percentage of the Fund’s assets attributable in the aggregate to that class of shares. PIMCO, in turn, provides or procures administrative services for Class D shareholders and also bears the costs of various third-party services required by the Fund, including audit, custodial, portfolio accounting, legal, transfer agency and printing costs. PIMCO may pay financial service firms a portion of the Class D administrative fees in return for the firm’s services (normally not to exceed an annual rate of 0.35% of the Fund’s average daily net assets attributable to Class D shares purchased through such firms). The Fund does bear other expenses which are not covered under the administrative fee which may vary and affect the total level of expenses paid by Class D shareholders, such as brokerage fees, commissions and other transaction expenses, costs of borrowing money, including interest expenses, extraordinary expenses (such as litigation and indemnification expenses) and fees and expenses of the Trust’s Independent Trustees and their counsel. PIMCO generally earns a profit on the administrative fee. Also, under the terms of the administration agreement, PIMCO, and not Fund shareholders, would benefit from any price decreases in third-party services, including decreases resulting from an increase in net assets.

The Fund will pay PIMCO monthly administrative fees at the following annual rate (stated as a percentage of the average daily net assets attributable in the aggregate to the Fund’s Class D shares) of 0.65%.

PIMCO has contractually agreed, for the Fund’s current fiscal year, to reduce total annual fund operating expenses for Class D shares, by waiving a portion of its administrative fee or reimbursing the Fund, to the extent that they would exceed, due to the payment of organizational expenses, the sum of the Fund’s advisory fee (prior to the application of the advisory fee waiver described above), distribution fees, service fees and administrative fee, plus 0.49 basis points. PIMCO may recoup these waivers and reimbursements for a period not exceeding three years, provided that total expenses, including such recoupment, do not exceed the annual expense limit.

The Fund’s administration agreement includes a plan for Class D shares that has been adopted in conformity with the requirements set forth in Rule 12b-1 under the 1940 Act. The plan provides that up to 0.25% per annum of the Class D administrative fees paid under the administration agreement may represent reimbursement for expenses in respect of activities that may be deemed to be primarily intended to result in the

sale of Class D shares. The principal types of activities for which such payments may be made are services in connection with the distribution of Class D shares and/or the provision of shareholder services. Because 12b-1

fees would be paid out of the Fund’s Class D share assets on an ongoing basis, over time these fees would increase the cost of your investment in Class D shares and may cost you more than other types of sales charges.

Since February 2004, PIMCO, AGI, AGID, and certain of their affiliates, including the Trust, Allianz Funds (formerly known as PIMCO Funds: Multi-Manager Series), the Trustees of the Trust and certain employees of PIMCO have been named as defendants in fifteen lawsuits filed in various jurisdictions. Eleven of those lawsuits concern “market timing,” and they have been transferred to and consolidated for pre-trial proceedings in multi-district litigation proceedings in the U.S. District Court for the District of Maryland; the other four lawsuits concern “revenue sharing” and have been consolidated into a single action in the U.S. District Court for the District of Connecticut. The lawsuits have been commenced as putative class actions on behalf of investors who purchased, held or redeemed shares of the various series of the Trust and the Allianz Funds during specified periods, or as derivative actions on behalf of the Trust and Allianz Funds.

Two nearly identical class action civil complaints have been filed in August 2005, in the Northern District of Illinois Eastern Division, alleging that the plaintiffs each purchased and sold a 10-year Treasury note futures contract and suffered damages from an alleged shortage when PIMCO held both physical and futures positions in 10-year Treasury notes for its client accounts. The two actions have been consolidated into one action, and the two separate complaints have been replaced by a consolidated complaint. PIMCO is a named defendant and the Trust has been added as a defendant, to the consolidated action. PIMCO strongly believes the complaint is without merit and intends to vigorously defend itself.

Jersey. In July 2004, PIMCO was named in this lawsuit and remains a defendant. The plaintiff seeks to recover for the bankruptcy estate assets that were transferred by the predecessor entity of G-I Holdings, Inc. to a wholly-owned subsidiary in 1994. The subsidiary has since issued notes, of which certain funds of the Trust are alleged to be holders. The complaint alleges that in 2000, more than two hundred noteholders—including certain funds of the Trust—were granted a second priority lien on the assets of the subsidiary in exchange for their consent to a refinancing transaction and the granting of a first priority lien to the lending banks. The plaintiff is seeking invalidation of the lien in favor of the noteholders and/or the value of the lien. On June 21, 2006, the District of New Jersey overturned the Bankruptcy Court’s decision granting permission to file the adversary proceeding and remanded the matter to the Bankruptcy Court for further proceedings. Following a motion to reconsider, the District Court upheld its remand on August 7, 2006, and instructed the Bankruptcy Court to conduct a “cost-benefit” analysis of the Committee’s claims, including the claims against the noteholders. The Bankruptcy Court held a status conference on October 25, 2006 and set a briefing schedule relating to this cost-benefit analysis.

The following section provides basic information about how to buy, sell (redeem) and exchange Class D shares of the Fund.

• Financial Service Firms. Broker-dealers, registered investment advisers and other financial service firms provide varying investment products, programs or accounts, pursuant to arrangements with the Distributor, through which their clients may purchase and redeem Class D shares of the Fund. Firms will generally provide or arrange for the provision of some or all of the shareholder servicing and account maintenance services required by your account, including, without limitation, transfers of registration and dividend payee changes. Firms may also perform other functions, including generating confirmation statements and disbursing cash dividends, and may arrange with their clients for other investment or administrative services. Your firm may independently establish and charge you transaction fees and/or other additional amounts for such services, which may change over time. These fees and additional amounts could reduce your investment returns on Class D shares of the Fund.

Your financial service firm may have omnibus accounts and similar arrangements with the Trust and may be paid for providing sub-transfer agency and other services. A firm may be paid for its services directly or indirectly by the Fund, the Administrator or another affiliate of the Fund (at an annual rate generally not to exceed 0.35% (up to 0.25% may be paid by the Fund) of the Fund’s average daily net assets attributable to its Class D shares purchased through such firm for its clients, although payments with respect to shares in retirement plans are often higher). Your firm may establish various minimum investment requirements for Class D shares of the Fund and may also establish certain privileges with respect to purchases, redemptions and exchanges of Class D shares or the reinvestment of dividends. Please contact your firm for information.

This prospectus should be read in connection with your firm’s materials regarding its fees and services.

• Calculation of Share Price and Redemption Payments. When you buy Class D shares of the Fund, you pay a price equal to the net asset value (“NAV”) of the shares. When you sell (redeem) Class D shares of the Fund, you receive an amount equal to the NAV of the shares, minus any applicable redemption fees. NAVs are determined at the close of regular trading (normally 4:00 p.m. Eastern time) on each day the New York Stock Exchange (“NYSE”) is open. See “How Fund Shares Are Priced” below for details. Generally, purchase and redemption orders for Fund shares are processed at the NAV next calculated after your order is received by the Distributor. In addition, orders received by the Distributor from financial service firms after NAV is determined that day will be processed at that day’s NAV if the orders were received by the firm from its customer prior to such determination and were transmitted to and received by the Distributor prior to its close of business that day (normally 7:00 p.m., Eastern time).

Class D shares of the Fund are continuously offered through financial service firms, such as broker-dealers or registered investment advisers, with which the Distributor has an agreement for the use of the Fund in particular investment products, programs or accounts for which a fee may be charged. See “Financial Service Firms” above.

You may purchase Class D shares only through your financial service firm. In connection with purchases, your financial service firm is responsible for forwarding all necessary documentation to the Distributor, and may charge you for such services. If you wish to purchase shares of the Fund directly from the Distributor, you should inquire about the other classes of shares offered by the Trust. Please call the Distributor at 1-800-426-0107 for information about other investment options.

Class D shares of the Fund will be held in your account with your financial service firm and, generally, your firm will hold your Class D shares in nominee or street name as your agent. In most cases, the Trust’s transfer agent will have no information with respect to or control over accounts of specific Class D shareholders and you may obtain information about your accounts only through your financial service firm. In certain circumstances, your firm may arrange to have your shares held in your own name or you may subsequently become a holder of record for some other reason (for instance, if you terminate your relationship with your firm). In such circumstances, please contact the Distributor at 1-800-426-0107 for information about your account. In the interest of economy and convenience, certificates for Class D shares will not be issued.

The Distributor, in its sole discretion, may accept or reject any order for purchase of Fund shares. The sale of shares will be suspended during any period in which the NYSE is closed for other than weekends or holidays, or if permitted by the rules of the SEC, when trading on the NYSE is restricted or during an emergency which makes it impracticable for the Fund to dispose of their securities or to determine fairly the value of their net assets, or during any other period as permitted by the SEC for the protection of investors.

An investor should invest in the Fund for long-term investment purposes only. The Trust reserves the right to refuse purchases if, in the judgment of PIMCO, the purchases would adversely affect the Fund and its shareholders. In particular, the Trust and PIMCO each reserves the right to restrict purchases of Fund shares (including exchanges) when a pattern of frequent purchases and sales made in response to short-term fluctuations in share price appears evident. Notice of any such restrictions, if any, will vary according to the particular circumstances.

Investment Minimums. The following investment minimums apply for purchases of Class D shares.

Your financial service firm may impose different investment minimums than the Trust. For example, if your firm maintains an omnibus account with the Fund, the firm may impose higher or lower investment minimums than the Trust when you invest in Class D shares of the Fund through your firm. Please contact your firm for information.

may be harmful to the Fund and its shareholders. Such activities may have a detrimental effect on the Fund and its shareholders. For example, depending upon various factors such as the size of the Fund and the amount of its assets maintained in cash, short-term or excessive trading by Fund shareholders may interfere with the efficient management of the Fund’s portfolio, increase transaction costs and taxes, and may harm the performance of the Fund and its shareholders.

Second, to the extent that there is a delay between a change in the value of a mutual fund’s portfolio holdings, and the time when that change is reflected in the net asset value of the fund’s shares, the fund is exposed to the risk that investors may seek to exploit this delay by purchasing or redeeming shares at net asset values that do not reflect appropriate fair value prices. The Trust seeks to deter and prevent this activity, sometimes referred to as “stale price arbitrage,” by the appropriate use of “fair value” pricing of the Fund’s portfolio securities. See “How Fund Shares Are Priced” below for more information.

Because of the disproportionately high costs of servicing accounts with low balances, you will be charged a fee at the annual rate of $16 if your account balance for the Fund falls below a minimum level of $2,500, except for Uniform Gift to Minors, IRA, Roth IRA, employer-sponsored retirement plan accounts, Money Purchase and/or Profit Sharing plans, 401(k) plans, 403(b)(7) custodial accounts, SIMPLE IRAs, SEPs, SAR/SEPs, Auto-Invest and Auto-Exchange accounts, for which the minimum balance is $1,000. (A separate custodial fee may apply to IRAs, Roth IRAs and other retirement accounts.) However, you will not be charged this fee if the aggregate value of all of your Allianz Funds or PIMCO Funds accounts is at least $50,000. Any applicable small account fee will be deducted automatically from your below-minimum Fund account in quarterly installments and paid to the Administrator. Lower minimum balance requirements and waivers of the small account fee apply for certain categories of investors.

Due to the relatively high cost to the Fund of maintaining small accounts, you are asked to maintain an account balance in the Fund of at least the minimum investment necessary to open the particular type of account. If your balance for any Fund remains below the minimum for three months or longer, the Administrator has the right (except in the case of employer-sponsored retirement accounts) to redeem your remaining shares and close that Fund account after giving you 60 days to increase your balance. Your Fund account will not be liquidated if the reduction in size is due solely to a decline in market value of your Fund shares or if the aggregate value of all your Allianz Funds or PIMCO Funds accounts exceeds $50,000.

You may exchange your Class D shares of the Fund for Class D shares of any other fund of the Trust or any fund of Allianz Funds that offers Class D shares. Shares are exchanged on the basis of their respective NAVs next calculated after your exchange order is received by the Distributor. Exchanges of shares held less than a certain

number of days may be subject to a redemption fee. See “Redemption Fees” below. Your financial service firm may impose various fees and charges, investment minimums and other requirements with respect to exchanges. Please contact your financial service firm to exchange your shares and for additional information about the exchange privilege.

The Trust reserves the right to refuse exchange purchases (or purchase and redemption and/or redemption and purchase transactions) if, in the judgment of PIMCO, the transaction would adversely affect the Fund and its shareholders. Although the Trust has no current intention of terminating or modifying the exchange privilege, it reserves the right to do so at any time. Except as otherwise permitted by SEC regulations, the Trust will give 60 days’ advance notice to your financial service firm of any termination or material modification of the exchange privilege.

4. Social security number, taxpayer identification number, or other identifying number.

Federal law prohibits the Fund and other financial institutions from opening a new account unless they receive the minimum identifying information listed above.

You can sell (redeem) Class D shares through your financial service firm on any day the NYSE is open. Other than any applicable redemption fee (see below), you do not pay any fees or other charges to the Trust or the Distributor when you sell your shares, although your financial service firm may charge you for its services in processing your redemption request. Please contact your firm for details. If you are the holder of record of your Class D shares, you may contact the Distributor at 1-800-426-0107 for information regarding how to sell your shares directly to the Trust.

Your financial service firm is obligated to transmit your redemption orders to the Distributor promptly and is responsible for ensuring that your redemption request is in proper form. Your financial service firm will be responsible for furnishing all necessary documentation to the Distributor or the Trust’s transfer agent and may charge you for its services. Redemption proceeds will be forwarded to your financial service firm as promptly as possible and in any event within seven days after the redemption request is received by the Distributor in good order. Redemptions of Fund shares may be suspended when trading on the NYSE is restricted or during an emergency which makes it impracticable for the Fund to dispose of its securities or to determine fairly the value of its net assets, or during any other period as permitted by the SEC for the protection of investors. Under these and other unusual circumstances, the Trust may suspend redemptions or postpone payment for more than seven days, as permitted by law.

Signature Guarantee. When a signature guarantee is called for, a “medallion” signature guarantee will be required. A medallion signature guarantee may be obtained from a domestic bank or trust company, broker, dealer, clearing agency, savings association or other financial institution which is participating in a medallion program recognized by the Securities Transfer Association. The three recognized medallion programs are the Securities Transfer Agents Medallion Program, Stock Exchanges Medallion Program and New York Stock Exchange, Inc. Medallion Signature Program. Signature guarantees from financial institutions which are not participating in one of these programs will not be accepted. Please note that financial institutions participating in a recognized medallion program may still be ineligible to provide a signature guarantee for transactions of greater than a specified dollar amount. The Trust may change the signature guarantee requirements from time to time upon notice to shareholders, which may be given by means of a new or supplemented prospectus.

The Trust has agreed to redeem shares of the Fund solely in cash up to the lesser of $250,000 or 1% of the Fund’s net assets during any 90-day period for any one shareholder. In consideration of the best interests of the remaining shareholders, the Trust may pay any redemption proceeds exceeding this amount in whole or in part by a distribution in kind of securities held by the Fund in lieu of cash. It is highly unlikely that your shares would ever be redeemed in kind. If your shares are redeemed in kind, you should expect to incur transaction costs upon the disposition of the securities received in the distribution.

companies that sponsor registered separate accounts organized as unit investment trusts, master-feeder funds, and certain fund-of-funds arrangements or, in the case of employee benefit plans, the plan administrators or plan recordkeepers) that currently do not have the capability to assess or collect the redemption fee, or that have not agreed to provide the information necessary for the Fund to assess and collect the redemption fee on such shareholders. The Fund may nonetheless continue to effect share transactions for such shareholders and financial intermediaries. By their nature, omnibus accounts, in which purchases and sales of Fund shares by multiple shareholders are aggregated for submission to the Fund on a net basis, conceal the identity of the individual investors from the Fund. This makes it more difficult for the Fund to identify short-term transactions in the Fund, and makes assessment and collection of the redemption fee on transactions effected through such accounts impossible without the assistance of the financial intermediary. Due to these limitations on the assessment of the redemption fee, the Fund’s use of redemption fees may not successfully reduce or eliminate excessive short-term trading in shares of the Fund or fully insulate long-term shareholders from associated costs or other dilution of the value of Fund shares.

Waivers of Redemption Fees. In the following situations, the Fund has elected not to impose the redemption fee:

Applicability of Redemption Fees in Certain Participant-Directed Retirement Plans. Redemption fees will not apply to the following transactions in participant-directed retirement plans (such as 401(k), 403(b), 457 and Keogh plans): 1) where the shares being redeemed were purchased with new contributions to the plan (e.g., payroll contributions, employer contributions, loan repayments); 2) redemptions made in connection with taking out a loan from the plan; 3) redemptions in connection with death, disability, forfeiture, hardship withdrawals, or Qualified Domestic Relations Orders; 4) redemptions made as part of a systematic withdrawal plan; 5) redemptions made by a defined contribution plan in connection with a termination or restructuring of the plan or 6) redemptions made in connection with a participant’s termination of employment. Redemption fees generally will apply to other participant-directed redemptions and exchanges. For example, if a participant exchanges shares of Fund A that were purchased with new contributions, into Fund B, a redemption fee would not apply to that exchange. However, any subsequent participant-directed exchange of those shares from Fund B into Fund A or another fund may be subject to redemption fees, depending upon the holding period and subject to the exceptions described in this paragraph (and other limitations on imposing redemption fees, as discussed above).

Retirement plan sponsors, participant recordkeeping organizations and other financial intermediaries may also impose their own restrictions, limitations or fees in connection with transactions in the Fund’s shares, which may be stricter than those described in this section. You should contact your plan sponsor, recordkeeper or financial intermediary for more information on any differences in how the redemption fee is applied to your investments in the Fund, and whether any additional restrictions, limitations or fees are imposed in connection with transactions in Fund shares.

Some or all of the distribution fees and servicing fees described above are paid or “reallowed” to the broker, dealer or financial adviser (collectively, “financial firms”) through which you purchase your shares. Please see the Statement of Additional Information for more details. A financial firm is one that, in exchange for compensation, sells, among other products, mutual fund shares (including the shares offered in this prospectus) or provides services for mutual fund shareholders. Financial firms include brokers, dealers, insurance companies and banks.

A number of factors will be considered in determining the amount of these payments to financial firms. On some occasions, such payments may be conditioned upon levels of sales, including the sale of a specified minimum dollar amount of the shares of the Fund, all other series of the Trust, other funds sponsored by the Distributor and/or a particular class of shares, during a specified period of time. The Distributor may also make payments to one or more participating financial firms based upon factors such as the amount of assets a financial firm’s clients have invested in the Fund and the quality of the financial firm’s relationship with the Distributor.

The payments described above are made at the Distributor’s expense. These payments may be made to financial firms selected by the Distributor, generally to the financial firms that have sold significant amounts of shares of the Fund. The level of payments made to a financial firm in any future year will vary and generally will not exceed the sum of (a) 0.10% of such year’s fund sales by that financial firm and (b) 0.06% of the assets attributable to that financial firm invested in equity funds sponsored by the Distributor and 0.03% of the assets invested in fixed-income funds sponsored by the Distributor. In certain cases, the payments described in the preceding sentence may be subject to certain minimum payment levels. In lieu of payments pursuant to the foregoing formulae, the Distributor may make payments of an agreed upon amount which normally will not exceed the amount that would have been payable pursuant to the formulae. There are a few existing relationships on different bases that are expected to terminate, although the actual termination date is not known. In some cases, in addition to the payments described above, the Distributor will make payments for special events such as a conference or seminar sponsored by one of such financial firms.

For further details about payments made by the Distributor to financial firms, please see the Statement of Additional Information.

The NAV of the Fund’s Class D shares is determined by dividing the total value of the Fund’s portfolio investments and other assets attributable to that class, less any liabilities, by the total number of shares outstanding of that class.

Fund shares are valued as of the close of regular trading (normally 4:00 p.m., Eastern time) (the “NYSE Close”) on each day that the NYSE is open. For purposes of calculating the NAV, the Fund normally uses pricing data for domestic equity securities received shortly after the NYSE Close and does not normally take into account trading, clearances or settlements that take place after the NYSE Close. Domestic fixed income and foreign securities are normally priced using data reflecting the earlier closing of the principal markets for those securities. Information that becomes known to the Fund or their agents after the NAV has been calculated on a particular day will not generally be used to retroactively adjust the price of a security or the NAV determined earlier that day.

Market quotes are considered not readily available in circumstances where there is an absence of current or reliable market-based data (e.g., trade information, bid/asked information, broker quotes), including where events occur after the close of the relevant market, but prior to the NYSE Close, that materially affect the values of the Fund’s securities or assets. In addition, market quotes are considered not readily available when, due to extraordinary circumstances, the exchanges or markets on which the securities trade do not open for trading for the entire day and no other market prices are available. The Board has delegated to PIMCO the responsibility for monitoring significant events that may materially affect the values of the Fund’s securities or assets and for determining whether the value of the applicable securities or assets should be re-evaluated in light of such significant events.

When the Fund uses fair value pricing to determine its NAV, securities will not be priced on the basis of quotations from the primary market in which they are traded, but rather may be priced by another method that the Board of Trustees or persons acting at their direction believe accurately reflects fair value. The Trust’s policy is intended to result in a calculation of the Fund’s NAV that fairly reflects security values as of the time of pricing. However, fair values determined by the Board of Trustees or persons acting at their direction may not accurately reflect the price that the Fund could obtain for a security if it were to dispose of that security as of the time of pricing. The Fund’s use of fair valuation may also help to deter “stale price arbitrage” as discussed above under “Abusive Trading Practices.” Fair value pricing may require subjective determinations about the value of a security.

Your financial service firm may offer additional distribution reinvestment programs or options. Please contact your firm for details.

You do not pay any sales charges on shares you receive through the reinvestment of Fund distributions. If you elect to receive Fund distributions in cash and the postal or other delivery service is unable to deliver checks to your address of record, the Trust’s Transfer Agent will hold the returned checks for your benefit in a non-interest bearing account.

Fund dividends (i.e., distributions of investment income) are taxable to you as ordinary income. Federal taxes on Fund distributions of gains are determined by how long the Fund owned the investments that generated the gains, rather than how long you have owned your shares. Distributions of gains from investments that the Fund owned for more than one year will generally be taxable to you as long-term capital gains. Distributions of gains from investments that the Fund owned for one year or less will generally be taxable to you as ordinary income.

PIMCO attempts to identify areas of the bond market that are undervalued relative to the rest of the market. PIMCO identifies these areas by grouping bonds into sectors: such as money markets, governments, corporates, mortgages, asset-backed and international. Sophisticated proprietary software then assists in evaluating sectors and pricing specific securities. Once investment opportunities are identified, PIMCO will shift assets among sectors depending upon changes in relative valuations and credit spreads. There is no guarantee that PIMCO’s security selection techniques will produce the desired results.

unanticipated rates of prepayment on underlying mortgages increase the effective maturity of a mortgage-related security, the volatility of the security can be expected to increase. The value of these securities may fluctuate in response to the market’s perception of the creditworthiness of the issuers. Additionally, although mortgages and mortgage-related securities are generally supported by some form of government or private guarantee and/or insurance, there is no assurance that private guarantors or insurers will meet their obligations.

Corporate debt securities are subject to the risk of the issuer’s inability to meet principal and interest payments on the obligation and may also be subject to price volatility due to such factors as interest rate sensitivity, market perception of the creditworthiness of the issuer and general market liquidity. When interest rates rise, the value of corporate debt securities can be expected to decline. Debt securities with longer maturities tend to be more sensitive to interest rate movements than those with shorter maturities.

Securities rated lower than Baa by Moody’s or lower than BBB by S&P are sometimes referred to as “high yield” or “junk” bonds. Investing in high yield securities involves special risks in addition to the risks associated with investments in higher-rated fixed income securities. While offering a greater potential opportunity for capital appreciation and higher yields, high yield securities typically entail greater potential price volatility and may be less liquid than higher-rated securities. High yield securities may be regarded as predominately speculative with respect to the issuer’s continuing ability to meet principal and interest payments. They may also be more susceptible to real or perceived adverse economic and competitive industry conditions than higher-rated securities.

Inflation-indexed bonds (other than municipal inflation-indexed bonds and certain corporate inflation-indexed bonds, which are more fully described below) are fixed income securities whose principal value is periodically adjusted according to the rate of inflation. If the index measuring inflation falls, the principal value of inflation-indexed bonds (other than municipal inflation indexed bonds and certain corporate inflation-indexed bonds) will be adjusted downward, and consequently the interest payable on these securities (calculated with respect to a smaller principal amount) will be reduced. Repayment of the original bond principal upon maturity (as adjusted for inflation) is guaranteed in the case of U.S. Treasury inflation-indexed bonds. For bonds that do not provide a similar guarantee, the adjusted principal value of the bond repaid at maturity may be less than the original principal.

dividends and interest payable on those securities may be subject to foreign taxes, including taxes withheld from payments on those securities. Foreign securities often trade with less frequency and volume than domestic securities and therefore may exhibit greater price volatility. Investments in foreign securities may also involve higher custodial costs than domestic investments and additional transaction costs with respect to foreign currency conversions. Changes in foreign exchange rates also will affect the value of securities denominated or quoted in foreign currencies.

• Emerging Markets Securities. A security is economically tied to an emerging market country if it is principally traded on the country’s securities markets, or the issuer is organized or principally operates in the country, derives a majority of its income from its operations within the country, or has a majority of its assets in the country. PIMCO has broad discretion to identify and invest in countries that it considers to qualify as emerging securities markets. However, an emerging securities market is generally considered to be one located in any country that is defined as an emerging or developing economy by the World Bank or its related organizations, or the United Nations or its authorities. In making investments in emerging market securities, the Fund emphasizes countries with relatively low gross national product per capita and with the potential for rapid economic growth. PIMCO will select the country and currency composition based on its evaluation of relative interest rates, inflation rates, exchange rates, monetary and fiscal policies, trade and current account balances, and any other specific factors it believes to be relevant.

Additional risks of emerging markets securities may include: greater social, economic and political uncertainty and instability; more substantial governmental involvement in the economy; less governmental supervision and regulation; unavailability of currency hedging techniques; companies that are newly organized and small; differences in auditing and financial reporting standards, which may result in unavailability of material information about issuers; and less developed legal systems. In addition, emerging securities markets may have different clearance and settlement procedures, which may be unable to keep pace with the volume of securities transactions or otherwise make it difficult to engage in such transactions. Settlement problems may cause the Fund to miss attractive investment opportunities, hold a portion of its assets in cash pending investment, or be delayed in disposing of a portfolio security. Such a delay could result in possible liability to a purchaser of the security.

The Fund may enter into reverse repurchase agreements and dollar rolls, subject to the Fund’s limitations on borrowings. A reverse repurchase agreement or dollar roll involves the sale of a security by the Fund and its agreement to repurchase the instrument at a specified time and price, and may be considered a form of borrowing for some purposes. The Fund will segregate or “earmark” assets determined to be liquid by PIMCO or otherwise cover its obligations under reverse repurchase agreements, dollar rolls and other borrowings. Reverse repurchase agreements, dollar rolls and other forms of borrowings may create leveraging risk for the Fund.

Management Risk. Derivative products are highly specialized instruments that require investment techniques and risk analyses different from those associated with stocks and bonds. The use of a derivative requires an understanding not only of the underlying instrument but also of the derivative itself, without the benefit of observing the performance of the derivative under all possible market conditions.

Credit Risk. The use of a derivative instrument involves the risk that a loss may be sustained as a result of the failure of another party to the contract (usually referred to as a “counterparty”) to make required payments or otherwise comply with the contract’s terms. Additionally, credit default swaps could result in losses if the Fund does not correctly evaluate the creditworthiness of the company on which the credit default swap is based.

Leverage Risk. Because many derivatives have a leverage component, adverse changes in the value or level of the underlying asset, reference rate or index can result in a loss substantially greater than the amount invested in the derivative itself. Certain derivatives have the potential for unlimited loss, regardless of the size of the initial investment. When the Fund uses derivatives for leverage, investments in the Fund will tend to be more volatile, resulting in larger gains or losses in response to market changes. To limit leverage risk, the Fund will segregate or “earmark” assets determined to be liquid by PIMCO in accordance with procedures established by the Board of Trustees (or, as permitted by applicable regulation, enter into certain offsetting positions) to cover its obligations under derivative instruments.

Lack of Availability. Because the markets for certain derivative instruments (including markets located in foreign countries) are relatively new and still developing, suitable derivatives transactions may not be available in all circumstances for risk management or other purposes. Upon the expiration of a particular contract, the portfolio managers may wish to retain the Fund’s position in the derivative instrument by entering into a similar contract, but may be unable to do so if the counterparty to the original contract is unwilling to enter into the new contract and no other suitable counterparty can be found. There is no assurance that the Fund will engage in derivatives transactions at any time or from time to time. The Fund’s ability to use derivatives may also be limited by certain regulatory and tax considerations.

Market and Other Risks. Like most other investments, derivative instruments are subject to the risk that the market value of the instrument will change in a way detrimental to the Fund’s interest. If the portfolio managers incorrectly forecast the values of securities, currencies or interest rates or other economic factors in using derivatives for the Fund, the Fund might have been in a better position if it had not entered into the transaction at all. While some strategies involving derivative instruments can reduce the risk of loss, they can also reduce the opportunity for gain or even result in losses by offsetting favorable price movements in other Fund investments. The Fund may also have to buy or sell a security at a disadvantageous time or price because the Fund is legally required to maintain offsetting positions or asset coverage in connection with certain derivatives transactions.

Other risks in using derivatives include the risk of mispricing or improper valuation of derivatives and the inability of derivatives to correlate perfectly with underlying assets, rates and indexes. Many derivatives, in particular privately negotiated derivatives, are complex and often valued subjectively. Improper valuations can result in increased cash payment requirements to counterparties or a loss of value to the Fund. Also, the value of derivatives may not correlate perfectly, or at all, with the value of the assets, reference rates or indexes they are designed to closely track. For example a swap agreement on an exchange traded fund would not correlate perfectly with the index upon which the exchange traded fund is based because the fund’s return is net of fees and expenses. In addition, the Fund’s use of derivatives may cause the Fund to realize higher amounts of short-term capital gains (generally taxed at ordinary income tax rates) than if the Fund had not used such instruments.

Subject to the restrictions and limitations of the 1940 Act, the Fund may elect to pursue its investment objectives either by investing directly in securities or, by investing in one or more underlying investment vehicles or companies that have substantially similar investment objectives and policies as the Fund. The Fund may also invest in exchange traded funds, subject to the restrictions and limitations of the 1940 Act.

The Fund may invest up to 15% of its net assets in illiquid securities. Certain illiquid securities may require pricing at fair value as determined in good faith under the supervision of the Board of Trustees. The portfolio managers may be subject to significant delays in disposing of illiquid securities, and transactions in illiquid securities may entail registration expenses and other transaction costs that are higher than those for transactions in liquid securities. The term “illiquid securities” for this purpose means securities that cannot be disposed of within seven days in the ordinary course of business at approximately the amount at which the Fund has valued the securities. Restricted securities, i.e., securities subject to legal or contractual restrictions on resale, may be illiquid. However, some restricted securities (such as securities issued pursuant to Rule 144A under the Securities Act of 1933, as amended, and certain commercial paper) may be treated as liquid, although they may be less liquid than registered securities traded on established secondary markets.

Because the Fund has not commenced operations as of the date of this prospectus, audited financial highlights are not available.

High Quality Debt Securities are those rated, in one of the two highest rating categories (the highest category for commercial paper) or, if unrated, deemed comparable by PIMCO.

Investment Grade Debt Securities are those rated in one of the four highest rating categories or, if unrated, deemed comparable by PIMCO.

Below Investment Grade, High Yield Securities (“Junk Bonds”) are those rated lower than Baa by Moody’s or BBB by S&P and comparable securities. They are deemed to be predominately speculative with respect to the issuer’s ability to repay principal and interest.

The following is a description of Moody’s and S&P’s rating categories applicable to fixed income securities.

Baa: Bonds which are rated Baa are considered as medium-grade obligations (i.e., they are neither highly protected nor poorly secured). Interest payments and principal security appear adequate for the present but certain protective elements may be lacking or may be characteristically unreliable over any great length of time. Such bonds lack outstanding investment characteristics and in fact have speculative characteristics as well.

Caa: Bonds which are rated Caa are of poor standing. Such issues may be in default or there may be present elements of danger with respect to principal or interest.

Ca: Bonds which are rated Ca represent obligations which are speculative in a high degree. Such issues are often in default or have other marked shortcomings.

C: Bonds which are rated C are the lowest rated class of bonds and issues so rated can be regarded as having extremely poor prospects of ever attaining any real investment standing.

Moody’s employs the following three designations, all judged to be investment grade, to indicate the relative repayment ability of rated issuers:

NOT PRIME: Issuers rated Not Prime do not fall within any of the Prime rating categories.

There are three rating categories for short-term municipal bonds that define an investment grade situation, which are listed below. In the case of variable rate demand obligations (VRDOs), a two-component rating is assigned. The first element represents an evaluation of the degree of risk associated with scheduled principal and interest payments, and the other represents an evaluation of the degree of risk associated with the demand feature. The short-term rating assigned to the demand feature of VRDOs is designated as VMIG. When either the long- or short-term aspect of a VRDO is not rated, that piece is designated NR, e.g., Aaa/NR or NR/VMIG 1. MIG ratings terminate at the retirement of the obligation while VMIG rating expiration will be a function of each issue’s specific structural or credit features.