STATEMENT OF ADDITIONAL INFORMATION

MARCH 31, 2014

This Statement of Additional Information (“ SAI ”) provides information about the Credit Suisse Volaris US Strategies Fund (the “Fund”), a series of Credit Suisse Opportunity Funds (the “Trust”), that supplements information contained in the Prospectus for the Fund, dated March 31, 2014, as amended or supplemented from time to time (the “ Prospectus ”).

This SAI is not itself a prospectus and should be read in conjunction with the Prospectus . Copies of the Prospectus can be obtained by writing or telephoning:

Credit Suisse Funds

P.O. Box 55030

Boston, MA 02205-5030

877-870-2874

Credit Suisse Asset Management, LLC (“Credit Suisse” or the “Adviser”), acts as the Fund’s investment adviser.

i

TABLE OF CONTENTS

i

ii

iii

Loans (“Participations”) and assignments of portions of Loans from third parties (“Assignments”). Participations typically will result in the Fund having a contractual relationship only with the Lender, not with the Borrower. The Fund will have the right to receive payments of principal, interest and any fees to which it is entitled only from the Lender selling the Participation and only upon receipt by the Lender of the payments from the Borrower. In connection with purchasing Participations, the Fund generally will have no right to enforce compliance by the Borrower with the terms of the loan agreement relating to the Loan, nor any rights of set-off against the Borrower, and the Fund may not directly benefit from any collateral supporting the Loan in which it has purchased the Participation. As a result, the Fund will assume the credit risk of both the Borrower and the Lender that is selling the Participation. In the event of the insolvency of the Lender selling a Participation, the Fund may be treated as a general creditor of the Lender and may not benefit from any set-off between the Lender and the Borrower. The Fund will acquire Participations only if the Lender interpositioned between the Fund and the Borrower is determined by Credit Suisse to be creditworthy.

When the Fund purchases Assignments from Lenders, the Fund will acquire direct rights against the Borrower on the Loan. However, since Assignments are generally arranged through private negotiations between potential assignees and potential assignors, the rights and obligations acquired by the Fund as the purchaser of an Assignment may differ from, and be more limited than, those held by the assigning Lender.

There are risks involved in investing in Participations and Assignments. The Fund may have difficulty disposing of them because there is no liquid market for such securities. The lack of a liquid secondary market will have an adverse impact on the value of such securities and on the Fund’s ability to dispose of particular Participations or Assignments when necessary to meet the Fund’s liquidity needs or in response to a specific economic event, such as a deterioration in the creditworthiness of the Borrower. The lack of a liquid market for Participations and Assignments also may make it more difficult for the Fund to assign a value to these securities for purposes of valuing the Fund’s portfolio and calculating its net asset value.

Below Investment Grade Securities

The Fund may invest in fixed income securities rated below investment grade and in comparable unrated securities (or in financial instruments related to below investment grade securities). Investment in such securities and instruments involves substantial risk. Below investment grade and comparable unrated securities (commonly referred to as “junk bonds” or “high yield securities”) (i) will likely have some quality and protective characteristics that, in the judgment of the rating organization, are outweighed by large uncertainties or major risk exposures to adverse conditions and (ii) are predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal in accordance with the terms of the obligation. The market values of certain of these securities also tend to be more sensitive to individual corporate developments and changes in economic conditions than higher-quality securities. Issuers of such securities are often highly leveraged and may not have more traditional methods of financing available to them so that their ability to service their debt obligations during an economic downturn or during sustained periods of rising interest rates may be impaired. Investors should be aware that ratings are relative and subjective and are not absolute standards of quality.

To the extent a secondary trading market for below investment grade securities does exist, it generally is not as liquid as the secondary market for investment grade securities. The lack of a liquid secondary market, as well as adverse publicity and investor perception with respect to these securities, may have an adverse impact on market price and the Fund’s ability to dispose of particular issues when necessary to meet the Fund’s liquidity needs or in response to a specific economic event such as a deterioration in the creditworthiness of the issuer. The lack of a liquid secondary market for certain securities also may make it more difficult for the Fund to obtain accurate market quotations for purposes of valuing the Fund and calculating its net asset value.

Subsequent to its purchase by the Fund, an issue of securities may cease to be rated or its rating may be reduced below the minimum required for purchase by the Fund. Neither event will require sale of such securities by the Fund, although Credit Suisse will consider such event in its determination of whether the Fund should continue to hold the securities.

The market value of securities rated below investment grade is more volatile than that of investment grade securities. Factors adversely impacting the market value of these securities will adversely impact the Fund’s net

2

asset value. The Fund will rely on the judgment, analysis and experience of Credit Suisse in evaluating the creditworthiness of an issuer. In this evaluation, Credit Suisse will take into consideration, among other things, the issuer’s financial resources, its sensitivity to economic conditions and trends, its operating history, the quality of the issuer’s management and regulatory matters. The Fund may incur additional expenses to the extent it is required to seek recovery upon a default in the payment of principal or interest on its portfolio holdings of such securities.

See Appendix B for a further description of securities ratings.

Borrowing

The Fund may borrow to the extent permitted by the Investment Company Act of 1940, as amended (the “1940 Act”), including borrowing for investment purposes.

Although the principal of such borrowings will be fixed, the Fund’s assets may change in value during the time the borrowing is outstanding. The Fund expects that some of its borrowings may be made on a secured basis. In such situations, either the custodian will segregate the pledged assets for the benefit of the lender or arrangements will be made with a suitable sub-custodian, which may include the lender.

Certain types of borrowings by the Fund may result in the Fund being subject to covenants in credit agreements relating to asset coverage, portfolio composition requirements and other matters. It is not anticipated that observance of such covenants would impede Credit Suisse from managing the Fund’s portfolio in accordance with the Fund’s investment objective and policies. However, a breach of any such covenants not cured within the specified cure period may result in acceleration of outstanding indebtedness and require the Fund to dispose of portfolio investments at a time when it may be disadvantageous to do so.

Leverage .  Borrowing for investment purposes has a leveraging effect because it tends to exaggerate the effect on a fund’s net asset value per share of any changes in the market value of its portfolio securities. The use of leverage by the Fund creates an opportunity for greater total return, but, at the same time, creates special risks. Borrowings will create interest expenses for the Fund which can exceed the income from the assets purchased with the borrowings. To the extent the income or capital appreciation derived from securities purchased with borrowed funds exceeds the interest the Fund will have to pay on the borrowings, the Fund’s return will be greater than if leverage had not been used. Conversely, if the income or capital appreciation from the securities purchased with such borrowed funds is not sufficient to cover the cost of borrowing, the return to the Fund will be less than if leverage had not been used, and therefore the amount available for distribution to shareholders as dividends and other distributions will be reduced. In the latter case, Credit Suisse in its best judgment nevertheless may determine to maintain the Fund’s leveraged position if it expects that the benefits to the Fund’s shareholders of maintaining the leveraged position will outweigh the current reduced return.

The Securities and Exchange Commission (“SEC”) takes the position that other transactions that have a leveraging effect on the capital structure of a fund can be viewed as constituting a form of “senior security” of the fund for purposes of the 1940 Act. These transactions may include selling securities short, buying and selling certain derivatives (such as futures contracts), selling (or writing) put and call options, engaging in when-issued, delayed-delivery, forward-commitment or reverse repurchase transactions and other trading practices that have a leveraging effect on the capital structure of a fund or may be viewed as economically equivalent to borrowing. A borrowing transaction will not be considered to constitute the issuance of a “senior security” by the Fund if the Fund (1) maintains an offsetting financial position, (2) maintains liquid assets in a sufficient value to cover the Fund’s potential obligation under the borrowing transaction not offset or covered as provided in (1) and (2), or (3) otherwise “covers” the transaction in accordance with applicable SEC guidance (collectively, “covers” the transaction). The value of the Fund’s holdings in such instruments is marked-to-market daily to ensure proper coverage. The Fund may have to buy or sell a security at a disadvantageous time or price in order to cover such transaction. In addition, assets being maintained to cover such transactions may not be available to satisfy redemptions or for other purposes or obligations.

3

Collateralized Debt Obligations

The Fund may invest in collateralized debt obligations (“CDOs”), which include collateralized bond obligations (“CBOs”), collateralized loan obligations (“CLOs”) and other similarly structured securities. CDOs are types of asset-backed securities. A CBO is ordinarily issued by a trust or other special purpose entity (“SPE”) and is typically backed by a diversified pool of fixed income securities (which may include high risk, below investment grade securities) held by such issuer. A CLO is ordinarily issued by a trust or other SPE and is typically collateralized by a pool of loans, which may include, among others, domestic and non-U.S. senior secured loans, senior unsecured loans, and subordinate corporate loans, including loans that may be rated below investment grade or equivalent unrated loans, held by such issuer. Although certain CDOs may benefit from credit enhancement in the form of a senior-subordinate structure, over-collateralization or bond insurance, such enhancement may not always be present, and may fail to protect the Fund against the risk of loss on default of the collateral. Certain CDO issuers may use derivatives contracts to create “synthetic” exposure to assets rather than holding such assets directly, which entails the risks of derivative instruments described elsewhere in this SAI . CDOs may charge management fees and administrative expenses, which are in addition to those of the Fund.

For both CBOs and CLOs, the cash flows from the SPE are split into two or more portions, called tranches, varying in risk and yield. The riskiest portion is the “equity” tranche, which bears the first loss from defaults from the bonds or loans in the SPE and serves to protect the other, more senior tranches from default (though such protection is not complete). Since it is partially protected from defaults, a senior tranche from a CBO or CLO typically has higher ratings and lower yields than its underlying securities, and may be rated investment grade. Despite the protection from the equity tranche, CBO or CLO tranches can experience substantial losses due to actual defaults, downgrades of the underlying collateral by rating agencies, forced liquidation of the collateral pool due to a failure of coverage tests, increased sensitivity to defaults due to collateral default and disappearance of protecting tranches, market anticipation of defaults as well as investor aversion to CBO or CLO securities as a class. Interest on certain tranches of a CDO may be paid in kind or deferred and capitalized (paid in the form of obligations of the same type rather than cash), which involves continued exposure to default risk with respect to such payments.

The risks of an investment in a CDO depend largely on the type of the collateral securities and the class of the CDO. Normally, CBOs, CLOs and other CDOs are privately offered and sold, and thus are not registered under the securities laws. As a result, investments in CDOs may be characterized by the Fund as illiquid securities. However, an active dealer market may exist for CDOs, allowing a CDO to qualify for Rule 144A transactions. In addition to the normal risks associated with fixed income securities and asset-backed securities generally discussed elsewhere in this SAI , CDOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the risk that the collateral may default or decline in value or be downgraded, if rated by a nationally recognized statistical rating organization (“NRSRO”); (iii) the Fund may invest in tranches of CDOs that are subordinate to other tranches; (iv) the structure and complexity of the transaction and the legal documents could lead to disputes among investors regarding the characterization of proceeds; (v) the investment return achieved by the Fund could be significantly different than those predicted by financial models; (vi) the lack of a readily available secondary market for CDOs; (vii) risk of forced “fire sale” liquidation due to technical defaults such as coverage test failures; and (viii) the CDO’s manager may perform poorly.

Collateralized Mortgage Obligations

The Fund may purchase collateralized mortgage obligations (“CMOs”) issued or guaranteed by the U.S. government, its agencies or instrumentalities (including those issued by the Government National Mortgage Association (“GNMA”), Fannie Mae and Freddie Mac) and by private issuers. CMOs are debt obligations that are collateralized by mortgage loans or mortgage pass-through securities (collectively “Mortgage Assets”). Payments of principal of, and interest on, the Mortgage Assets (and in the case of CMOs, any reinvestment income thereon) provide the funds to pay the debt service on the CMOs.

In a CMO, a series of bonds or certificates is issued in multiple classes. Each class of CMO, also referred to as a “tranche,” is issued at a specific fixed or floating coupon rate and has a stated maturity or final distribution date. The principal and interest on the Mortgage Assets may be allocated among the several classes of a CMO in many ways. In one structure, payments of principal, including any principal prepayments, on the Mortgage Assets are

4

applied to the classes of a CMO in the order of their respective stated maturities or final distribution dates so that no payment of principal will be made on any class of the CMO until all other classes having an earlier stated maturity or final distribution date have been paid in full. In some CMO structures, all or a portion of the interest attributable to one or more of the CMO classes may be added to the principal amounts attributable to such classes, rather than passed through to certificateholders on a current basis, until other classes of the CMO are paid in full.

Certain classes of CMOs are structured in a manner that makes them extremely sensitive to changes in prepayment rates. Interest only (“IO”) and principal only (“PO”) classes are examples of this. IOs are entitled to receive all or a portion of the interest, but none (or only a nominal amount) of the principal payments, from the underlying Mortgage Assets. If the mortgage assets underlying an IO experience greater than anticipated principal prepayments, then the total amount of interest payments allocable to the IO class, and therefore the yield to investors, generally will be reduced. In some instances, an investor in an IO may fail to recoup all of his or her initial investment, even if the security is government issued or guaranteed. Conversely, PO classes are entitled to receive all or a portion of the principal payments, but none of the interest, from the underlying Mortgage Assets. PO classes are purchased at substantial discounts from par, and the yield to investors will be reduced if principal payments are slower than expected. Some IOs and POs, as well as other CMO classes, are structured to have special protections against the effects of prepayments. These structural protections, however, normally are effective only within certain ranges of prepayment rates and thus will not protect investors in all circumstances. Inverse floating rate CMO classes also may be extremely volatile. These classes pay interest at a rate that decreases when a specified index of market rates increases and vice versa.

Parallel pay CMOs are structured to provide payments of principal on each payment date to more than one class. These simultaneous payments are taken into account in calculating the stated maturity date or final distribution date of each class, which, as with other CMO structures, must be retired by its stated maturity date or final distribution date but may be retired earlier.

Some CMO classes are structured to pay interest at rates that are adjusted in accordance with a formula, such as a multiple or fraction of the change in a specified interest rate index, so as to pay at a rate that will be attractive in certain interest rate environments but not in others. For example, an inverse floating rate CMO class pays interest at a rate that increases as a specified interest rate index decreases but decreases as that index increases. For other CMO classes, the yield may move in the same direction as market interest rates— i.e., the yield may increase as rates increase and decrease as rates decrease—but may do so more rapidly or to a greater degree. The market value of such securities generally is more volatile than that of a fixed rate obligation. Such interest rate formulas may be combined with other CMO characteristics. For example, a CMO class may be an inverse IO class, on which the holders are entitled to receive no payments of principal and are entitled to receive interest at a rate that will vary inversely with a specified index or a multiple thereof.

Convertible Securities

Convertible securities include both convertible debt and convertible preferred stock, and may be converted at either a stated price or stated rate into underlying shares of common stock. Because of this feature, convertible securities enable an investor to benefit from increases in the market price of the underlying common stock. Convertible securities provide higher yields than the underlying equity securities, but generally offer lower yields than non-convertible securities of similar quality. The value of convertible securities fluctuates in relation to changes in interest rates like bonds and, in addition, fluctuates in relation to the underlying common stock.

Currency Exchange Transactions

The value in U.S. dollars of the Fund’s assets that are invested in securities denominated in currencies other than the U.S. dollar may be affected favorably or unfavorably by a variety of factors not applicable to investment in U.S. securities, and the Fund may incur costs in connection with conversion between various currencies. The rate of exchange between the U.S. dollar and other currencies is determined by the forces of supply and demand in the foreign exchange markets. Changes in the exchange rates may result over time from the interaction of many factors directly or indirectly affecting economic and political conditions in the U.S. and a particular foreign country, including economic and political developments in other countries. Currency exchange transactions may be from any non-U.S. currency into U.S. dollars or into other appropriate currencies. The Fund will conduct its currency

5

exchange transactions (i) on a spot ( i.e. , cash) basis at the rate prevailing in the currency exchange market, (ii) through entering into currency futures contracts or options on such contracts (as described below), (iii) through entering into forward contracts to purchase or sell currency or (iv) by purchasing exchange-traded currency options. The Fund may engage in currency transactions for both hedging purposes and to increase total return, which may involve speculation.

Currency Hedging .  The Fund’s investments may be denominated in currencies of emerging market countries and, while it has the authority to do so, the Fund does not currently intend to hedge against a decline in the value of its assets versus the U.S. dollar. The Fund’s currency hedging, if any, will be limited to hedging involving either specific transactions or portfolio positions. Transaction hedging is the purchase or sale of forward currency with respect to specific receivables or payables of the Fund generally accruing in connection with the purchase or sale of its portfolio securities. Position hedging is the sale of forward currency with respect to portfolio security positions. The Fund may not position hedge to an extent greater than the aggregate market value (at the time of entering into the hedge) of the hedged securities.

A decline in the U.S. dollar value of a foreign currency in which the Fund’s securities are denominated will reduce the U.S. dollar value of the securities, even if their value in the foreign currency remains constant. The use of currency hedges does not eliminate fluctuations in the underlying prices of the securities, but it does establish a rate of exchange that can be achieved in the future. For example, in order to protect against diminutions in the U.S. dollar value of non-dollar denominated securities it holds, the Fund may purchase foreign currency put options. If the value of the foreign currency does decline, the Fund will have the right to sell the currency for a fixed amount in dollars and will thereby offset, in whole or in part, the adverse effect on the U.S. dollar value of its securities that otherwise would have resulted. Conversely, if a rise in the U.S. dollar value of a currency in which securities to be acquired are denominated is projected, thereby potentially increasing the cost of the securities, the Fund may purchase call options on the particular currency. The purchase of these options could offset, at least partially, the effects of the adverse movements in exchange rates. The benefit to the Fund derived from purchases of currency options, like the benefit derived from other types of options, will be reduced by premiums and other transaction costs. Because transactions in currency exchange are generally conducted on a principal basis, no fees or commissions are generally involved. Instead, profit to the currency trader is included in the purchase price. Currency hedging involves some of the same risks and considerations as other transactions with similar instruments. Although currency hedges limit the risk of loss due to a decline in the value of a hedged currency, at the same time, they also limit any potential gain that might result should the value of the currency increase. If a devaluation is generally anticipated, the Fund may not be able to contract to sell a currency at a price above the devaluation level it anticipates.

While the values of currency futures and options on futures, forward currency contracts and currency options may be expected to correlate with exchange rates, they will not reflect other factors that may affect the value of the Fund’s investments and a currency hedge may not be entirely successful in mitigating changes in the value of the Fund’s investments denominated in that currency. A currency hedge, for example, should protect a Yen-denominated bond against a decline in the Yen, but will not protect the Fund against a price decline if the issuer’s creditworthiness deteriorates.

Currency Options.   The Fund may purchase exchange-traded put and call options on foreign currencies. Put options convey the right to sell the underlying currency at a price which is anticipated to be higher than the spot price of the currency at the time the option is exercised. Call options convey the right to buy the underlying currency at a price which is expected to be lower than the spot price of the currency at the time the option is exercised.

Forward Currency Contracts.   A forward currency contract involves an obligation to purchase or sell a specific currency at a future date, which may be any fixed number of days from the date of the contract as agreed upon by the parties, at a price set at the time of the contract. These contracts are entered into in the interbank market conducted directly between currency traders (usually large commercial banks and brokers) and their customers. Forward currency contracts are similar to currency futures contracts, except that futures contracts are traded on commodities exchanges and are standardized as to contract size and delivery date.

The Fund also may enter into forward currency contracts with respect to specific transactions. For example, when the Fund anticipates the receipt in a foreign currency of interest payments on a security that it holds, the Fund

6

may desire to “lock-in” the U.S. dollar price of the security or the U.S. dollar equivalent of such payment, as the case may be, by entering into a forward contract for the purchase or sale, for a fixed amount of U.S. dollars, of the amount of foreign currency involved in the underlying transaction. The Fund will be able thereby to protect itself against a possible loss resulting from an adverse change in the relationship between the currency exchange rates during the period between the date on which the security is purchased or sold, or on which the payment is declared, and the date on which such payments are made or received.

At or before the maturity of a forward contract entered into to hedge against currency fluctuations with respect to a portfolio security, the Fund may either sell the portfolio security and make delivery of the currency, or retain the security and fully or partially offset its contractual obligation to deliver the currency by negotiating with its trading partner to enter into an offsetting transaction. If the Fund retains the portfolio security and engages in an offsetting transaction, the Fund, at the time of execution of the offsetting transaction, will incur a gain or a loss to the extent that movement has occurred in forward contract prices.

Forward currency contracts are highly volatile, and a relatively small price movement in a forward currency contract may result in substantial losses to the Fund. To the extent the Fund engages in forward currency contracts to generate current income, the Fund will be subject to these risks which the Fund might otherwise avoid ( e.g. , through use of hedging transactions.)

Dollar Rolls

In a “dollar roll,” the Fund sells fixed-income securities for delivery in the current month and simultaneously contracts to repurchase similar but not identical (same type, coupon and maturity) securities on a specified future date. During the roll period, the Fund would forgo principal and interest paid on such securities. The Fund would be compensated by the difference between the current sales price and the forward price for the future purchase, as well as by the interest earned on the cash proceeds of the initial sale. At the time the Fund enters into a dollar roll transaction, it will segregate with an approved custodian cash or liquid securities having a value not less than the repurchase price (including accrued interest) and will subsequently monitor the segregated assets to ensure that its value is maintained. Dollar rolls that are accounted for as financings are considered to be borrowings under the 1940 Act.

Dollar rolls involve the risk that the market value of the securities retained in lieu of sale may decline below the price of the securities the Fund has sold but is obligated to repurchase.

Equity Securities

Equity securities include common stock, preferred stock, securities convertible into common or preferred stock and warrants or rights to acquire common stock, including options. Equity securities are subject to financial and market risks and can be expected to fluctuate in value.

Exchange-Traded Notes

Exchange-traded notes (“ETNs”) are generally notes representing debt of the issuer, usually a financial institution. ETNs combine both aspects of bonds and exchange-traded funds (“ETFs”). An ETN’s returns are based on the performance of one or more underlying assets, reference rates or indexes, minus fees and expenses. Similar to ETFs, ETNs are listed on an exchange and traded in the secondary market. However, unlike an ETF, an ETN can be held until the ETN’s maturity, at which time the issuer will pay a return linked to the performance of the specific asset, index or rate (“reference instrument”) to which the ETN is linked minus certain fees. Unlike regular bonds, ETNs do not make periodic interest payments, and principal is not protected.

The value of an ETN may be influenced by, among other things, time to maturity, level of supply and demand for the ETN, volatility and lack of liquidity in underlying markets, changes in the applicable interest rates, the performance of the reference instrument, changes in the issuer’s credit rating and economic, legal, political or geographic events that affect the reference instrument. An ETN that is tied to a reference instrument may not replicate the performance of the reference instrument. ETNs also incur certain expenses not incurred by their applicable reference instrument.

7

Because the return on the ETN is dependent on the issuer’s ability or willingness to meet its obligations, the value of the ETN may change due to a change in the issuer’s credit rating, despite no change in the underlying reference instrument. The market value of ETN shares may differ from the value of the reference instrument. This difference in price may be due to the fact that the supply and demand in the market for ETN shares at any point in time is not always identical to the supply and demand in the market for the assets underlying the reference instrument that the ETN seeks to track.

There may be restrictions on the Fund’s right to redeem its investment in an ETN, which are generally meant to be held until maturity. The Fund’s decision to sell its ETN holdings may be limited by the availability of a secondary market. An investor in an ETN could lose some or all of the amount invested.

Fixed Income Securities

Fixed income securities are broadly characterized as those that provide for periodic payments to the holder of the security at a stated rate. Most fixed income securities, such as bonds, represent indebtedness of the issuer and provide for repayment of principal at a stated time in the future. Others do not provide for repayment of a principal amount, although they may represent a priority over common stockholders in the event of the issuer’s liquidation. Many fixed income securities are subject to scheduled retirement, or may be retired or “called” by the issuer prior to their maturity dates. The interest rate on certain fixed income securities, known as “variable rate obligations,” is determined by reference to or is a percentage of an objective standard, such as a bank’s prime rate, the 90-day Treasury bill rate, or the rate of return on commercial paper or bank certificates of deposit, and is periodically adjusted. Certain variable rate obligations may have a demand feature entitling the holder to resell the securities at a predetermined amount. The interest rate on certain fixed income securities, called “floating rate instruments,” changes whenever there is a change in a designated base rate.

The market values of fixed income securities tend to vary inversely with the level of interest rates. When interest rates rise, their values will tend to decline; when interest rates decline, their values generally will tend to rise. The potential for capital appreciation with respect to variable rate obligations or floating rate instruments will be less than with respect to fixed-rate obligations. Long-term instruments are generally more sensitive to these changes than short-term instruments. The market value of fixed income securities and therefore their yield are also affected by the perceived ability of the issuer to make timely payments of principal and interest.

Fixed income securities may be investment grade or below investment grade. “Investment grade” is a designation applied to intermediate and long-term corporate debt securities rated within the highest four rating categories assigned by Standard & Poor’s, a subsidiary of The McGraw-Hill Companies, Inc. (“S&P”) (AAA, AA, A or BBB, including the + or — designations) or by Moody’s Investors Service, Inc. (“Moody’s”) (Aaa, Aa, A or Baa, including any numerical designations), or, if unrated, considered by Credit Suisse to be of comparable quality. The ability of the issuer of an investment grade debt security to pay interest and to repay principal is considered to vary from extremely strong (for the highest ratings) through adequate (for the lowest ratings given above), although the lower-rated investment grade securities may be viewed as having speculative elements as well.

Those debt securities rated “BBB” or “Baa,” while considered to be “investment grade,” may have speculative characteristics and changes in economic conditions or other circumstances are more likely to lead to a weakened capacity to make principal and interest payments than is the case with higher grade bonds. As a consequence of the foregoing, the opportunities for income and gain may be limited.

Foreign Investments

Investors should recognize that investing in foreign companies involves certain risks, including those discussed below, which are in addition to those associated with investing in U.S. issuers. Individual foreign economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross national product, rate of inflation, capital reinvestment, resource self-sufficiency, and balance of payments positions. Many, if not all, of the foregoing considerations apply to investments in securities of foreign governments (or agencies or instrumentalities thereof) as well.

8

Foreign Currency Exchange .   The Fund that invests in securities denominated in currencies other than the U.S. dollar, and the Fund that may temporarily hold funds in bank deposits or other money market investments denominated in foreign currencies, may be affected favorably or unfavorably by exchange control regulations or changes in the exchange rate between such currencies and the dollar. A change in the value of a foreign currency relative to the U.S. dollar will result in a corresponding change in the dollar value of Fund assets denominated in that foreign currency. Changes in foreign currency exchange rates may also affect the value of dividends and interest earned, gains and losses realized on the sale of securities and net investment income and gains, if any, to be distributed to shareholders by the Fund. Unless otherwise contracted, the rate of exchange between the U.S. dollar and other currencies is determined by the forces of supply and demand in the foreign exchange markets. Changes in the exchange rate may result over time from the interaction of many factors directly or indirectly affecting economic and political conditions in the U.S. and a particular foreign country, including economic and political developments in other countries. Governmental intervention may also play a significant role. National governments rarely voluntarily allow their currencies to float freely in response to economic forces. Sovereign governments use a variety of techniques, such as intervention by a country’s central bank or imposition of regulatory controls or taxes, to affect the exchange rates of their currencies. The fund’s investments may be denominated in currencies of emerging market countries. While the fund does not currently intend to hedge against a decline in the value of its assets versus the U.S. dollar, the Fund may use hedging techniques with the objective of protecting against loss through the fluctuation of the value of foreign currencies against the U.S. dollar, particularly the forward market in foreign exchange, currency options and currency futures.

Information .   Many of the foreign securities held by the Fund will not be registered with, nor will the issuers thereof be subject to reporting requirements of, the SEC. Accordingly, there may be less publicly available information about these securities and about the foreign company or government issuing them than is available about a domestic company or government entity. Foreign companies are generally subject to financial reporting standards, practices and requirements that are either not uniform or less rigorous than those applicable to U.S. companies.

Political Instability .   With respect to some foreign countries, there is the possibility of expropriation or confiscatory taxation, limitations on the removal of funds or other assets of the Fund, political or social instability, military action, war or domestic developments which could affect U.S. investments in those and neighboring countries. Any of these actions or events could have a severe effect on security prices and impair the Fund’s ability to bring its capital or income back to the United States.

Foreign Markets .   Securities of some foreign companies are less liquid and their prices are more volatile than securities of comparable U.S. companies. Some countries have less-developed securities markets (and related transaction, registration and custody practices). Certain foreign countries are known to experience long delays between the trade and settlement dates of securities purchased or sold which may result in increased exposure to market and foreign exchange fluctuations and increased illiquidity. In addition to losses from such delays, less-developed securities markets could subject the Fund to losses from fraud, negligence or other actions.

Increased Expenses .   The operating expenses of the Fund, to the extent it invests in foreign securities, may be higher than that of an investment company investing exclusively in U.S. securities, since the expenses of the Fund, such as the cost of converting foreign currency into U.S. dollars, the payment of fixed brokerage commissions on foreign exchanges, custodial costs, valuation costs and communication costs, may be higher than those costs incurred by other investment companies not investing in foreign securities. In addition, foreign securities may be subject to foreign government taxes that would reduce the net yield on such securities.

Access .  Some countries may restrict the Fund’s access to investments or offer terms that are less advantageous than those for local investors. This could limit the attractive investment opportunities available to the Fund.

Europe — Recent Events .   A number of countries in Europe have experienced severe economic and financial difficulties. Many non-governmental issuers, and even certain governments, have defaulted on, or been forced to restructure, their debts; many other issuers have faced difficulties obtaining credit or refinancing existing obligations; financial institutions have in many cases required government or central bank support, have needed to raise capital, and/or have been impaired in their ability to extend credit; and financial markets in Europe and

9

elsewhere have experienced extreme volatility and declines in asset values and liquidity. These difficulties may continue, worsen or spread within and outside of Europe. Responses to the financial problems by European governments, central banks and others, including austerity measures and reforms, may not work, may result in social unrest and may limit future growth and economic recovery or have other unintended consequences. Further defaults or restructurings by governments and others of their debt could have additional adverse effects on economies, financial markets and asset valuations around the world. In addition, one or more countries may abandon the euro, the common currency of the European Union, and/or withdraw from the European Union. The impact of these actions, especially if they occur in a disorderly fashion, is not clear but could be significant and far-reaching. These events could negatively affect the value and liquidity of the Fund’s investments.

Depository Receipts.   Assets of the Fund may be invested in the securities of foreign issuers in the form of American Depository Receipts (“ADRs”), European Depository Receipts (“EDRs”) and International Depository Receipts (“IDRs”). These securities may not necessarily be denominated in the same currency as the securities into which they may be converted. ADRs are receipts typically issued by a U.S. bank or trust company which evidence ownership of underlying securities issued by a foreign corporation. EDRs, which are sometimes referred to as Continental Depository Receipts (“CDRs”), are receipts issued in Europe, and IDRs, which are sometimes referred to as Global Depository Receipts (“GDRs”), are issued outside the United States. EDRs (CDRs) and IDRs (GDRs) are typically issued by non-U.S. banks and trust companies and evidence ownership of either foreign or domestic securities. Generally, ADRs in registered form are designed for use in U.S. securities markets and EDRs (CDRs) and IDRs (GDRs) in bearer form are designed for use in European and non-U.S. securities markets, respectively. For purposes of the Fund’s investment policies, depository receipts generally are deemed to have the same classification as the underlying securities they represent. Thus, a depository receipt representing ownership of common stock will be treated as common stock.

ADRs are publicly traded on exchanges or over-the-counter in the United States and are issued through “sponsored” or “unsponsored” arrangements. In a sponsored ADR arrangement, the foreign issuer assumes the obligation to pay some or all of the depository’s transaction fees, whereas under an unsponsored arrangement, the foreign issuer assumes no obligations and the depository’s transaction fees are paid directly by the ADR holders. In addition, less information is available in the United States about an unsponsored ADR than about a sponsored ADR.

Emerging Markets.  Investing in securities of issuers, including governments, located in “emerging market” countries (less developed countries located outside of the United States) involves not only the risks described above with respect to investing in foreign securities, but also other risks, including exposure to economic structures that are generally less diverse and mature than, and to political systems that can be expected to have less stability than, those of developed countries. Other characteristics of emerging markets that may affect investment include certain national policies that may restrict investment by foreigners in issuers deemed sensitive to relevant national interests and the absence of developed structures governing private and foreign investments and private property. The typically small size of the markets of securities of issuers located in emerging markets and the possibility of a low or nonexistent volume of trading in those securities may also result in a lack of liquidity and in price volatility of those securities.

Foreign Debt Securities.   The returns on foreign debt securities reflect interest rates and other market conditions prevailing in those countries. The relative performance of various countries’ fixed income markets historically has reflected wide variations relating to the unique characteristics of the country’s economy. Year-to-year fluctuations in certain markets have been significant, and negative returns have been experienced in various markets from time to time.

The foreign government securities in which the Fund may invest generally consist of obligations issued or backed by national, state or provincial governments or similar political subdivisions or central banks in foreign countries. Foreign government securities also include debt obligations of supranational entities, which include international organizations designated or backed by governmental entities to promote economic reconstruction or development, international banking institutions and related government agencies. Examples include the International Bank for Reconstruction and Development (the “World Bank”), the Asian Development Bank and the Inter-American Development Bank.

10

Foreign government securities also include debt securities of “quasi-governmental agencies” and debt securities denominated in multinational currency units of an issuer (including supranational issuers). Debt securities of quasi-governmental agencies are issued by entities owned by either a national, state or equivalent government or are obligations of a political unit that is not backed by the national government’s full faith and credit and general taxing powers.

Investment of sovereign debt may not be able or willing to repay the principal and/or interest when due in accordance with the terms of such debt. A governmental entity’s willingness or ability to repay principal and interest due in a timely manner may be affected by, among other factors, its cash flow situation, the extent of its foreign reserves, the availability of sufficient foreign exchange on the date a payment is due, the relative size of the debt service burden to the economy as a whole, the governmental entity’s policy towards the International Monetary Fund and the political constraints to which a governmental entity may be subject. Governmental entities may also be dependent on expected disbursements from foreign governments, multilateral agencies and others abroad to reduce principal and interest arrearages on their debt. The commitment on the part of these governments, agencies and others to make such disbursements may be conditioned on the implementation of economic reforms and/or economic performance and the timely service of such debtor’s obligations. Failure to implement such reforms, achieve such levels of economic performance or repay principal or interest when due may result in the cancellation of such third parties’ commitments to lend funds to the governmental entity, which may further impair such debtor’s ability or willingness to timely service its debts. Consequently, governmental entities may default on their sovereign debt.

Holders of sovereign debt may be requested to participate in the rescheduling of such debt and to extend further loans to governmental entities. In the event of a default by a governmental entity, there may be few or no effective legal remedies for collecting on such debt.

Privatizations.   The Fund may invest in privatizations (i.e., foreign government programs of selling interests in government-owned or controlled enterprises). The ability of U.S. entities, such as the Fund, to participate in privatizations may be limited by local law, or the terms for participation may be less advantageous than for local investors. There can be no assurance that privatization programs will be available or successful.

Futures Contracts

The Fund may enter into commodity, foreign currency, interest rate and/or commodity or securities index futures contracts and purchase and write (sell) related options traded on exchanges designated by the Commodity Futures Trading Commission (the “CFTC”) or, consistent with CFTC regulations, on foreign exchanges. These futures contracts are standardized contracts for the future delivery of foreign currency or an interest rate sensitive security or, in the case of stock index and certain other futures contracts, a cash settlement with reference to a specified multiplier times the change in the specified index, exchange rate or interest rate. An option on a futures contract gives the purchaser the right, in return for the premium paid, to assume a position in a futures contract. The Fund reserves the right to engage in transactions involving futures contracts and options on futures contracts in accordance with the Fund’s policies.

A commodity futures contract provides for the future sale by one party and the purchase by the other party of a specified amount of a commodity, such as an energy, agricultural or metal commodity, at a specified price, date, time and place.  A foreign currency futures contract provides for the future sale by one party and the purchase by the other party of a certain amount of a specified non-U.S. currency at a specified price, date, time and place. An interest rate futures contract provides for the future sale by one party and the purchase by the other party of a certain amount of a specific interest rate sensitive financial instrument (debt security) at a specified price, date, time and place. Securities and commodities indexes are capitalization weighted indexes that reflect the market value of the securities or commodities, respectively, represented in the indexes. A securities index or commodities index futures contract is an agreement to be settled by delivery of an amount of cash equal to a specified multiplier times the difference between the value of the index at the close of the last trading day on the contract and the price at which the agreement is made. The clearing house of the exchange on which a futures contract is entered into becomes the counterparty to each purchaser and seller of the futures contract.

11

No consideration is paid or received by the Fund upon entering into a futures contract. Instead, the Fund is required to segregate with its custodian an amount of cash or securities acceptable to the broker equal to approximately 1% to 10% of the contract amount (this amount is subject to change by the exchange on which the contract is traded, and brokers may charge a higher amount). This amount is known as “initial margin” and is in the nature of a performance bond or good faith deposit on the contract which is returned to the Fund upon termination of the futures contract, assuming all contractual obligations have been satisfied. The broker will have access to amounts in the margin account if the Fund fails to meet its contractual obligations. Subsequent payments, known as “variation margin,” to and from the broker, will be made daily as the currency, financial instrument or securities index underlying the futures contract fluctuates, making the long and short positions in the futures contract more or less valuable, a process known as “marking-to-market.” As a result of the small margin deposit that is required, a small change in the market price of a futures contract can produce major losses. The Fund will also incur brokerage costs in connection with entering into futures contracts.

At any time prior to the expiration of a futures contract, the Fund may elect to close the position by taking an opposite position, which will operate to terminate the Fund’s existing position in the contract. Positions in futures contracts and options on futures contracts (described below) may be closed out only on the exchange on which they were entered into (or through a linked exchange). No secondary market for such contracts exists. Although the Fund may enter into futures contracts only if there is an active market for such contracts, there is no assurance that an active market will exist at any particular time. Most futures exchanges limit the amount of fluctuation permitted in futures contract prices during a single trading day. Once the daily limit has been reached in a particular contract, no trades may be made that day at a price beyond that limit or trading may be suspended for specified periods during the day. It is possible that futures contract prices could move to the daily limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of futures positions at an advantageous price and subjecting the Fund to substantial losses. In such event, and in the event of adverse price movements, the Fund would be required to make daily cash payments of variation margin. In such situations, if the Fund had insufficient cash, it might have to sell securities to meet daily variation margin requirements at a time when it would be disadvantageous to do so. In addition, if the transaction is entered into for hedging purposes, in such circumstances the Fund may realize a loss on a futures contract or option that is not offset by an increase in the value of the hedged position. Losses incurred in futures transactions and the costs of these transactions will affect the Fund’s performance.

Despite the daily price limits on the futures exchanges, the price volatility of commodity futures contracts has been historically greater than that for traditional securities such as stocks and bonds.  To the extent that the Fund invests in commodity futures contracts, the assets of the Fund, and therefore the prices of Fund shares, may be subject to greater volatility.

There are additional factors associated with commodity futures contracts which may subject the Fund’s investments in them to greater volatility than investments in traditional securities.  Unlike the financial futures markets, in the commodity futures markets there are costs of physical storage associated with purchasing the underlying commodity.  The price of the commodity futures contract will reflect the storage costs of purchasing the physical commodity, including the time value of money invested in the physical commodity.  To the extent that the storage costs for an underlying commodity change while the Fund is invested in futures contracts on that commodity, the value of the futures contract may change proportionately.  In the commodity futures markets, producers of the underlying commodity may decide to hedge the price risk of selling the commodity by selling futures contracts today to lock in the price of the commodity at delivery tomorrow.  In order to induce speculators to purchase the other side of the same futures contract, the commodity producer generally must sell the futures contract at a lower price than the expected future spot price of the commodity.  Conversely, if most hedgers in the futures market are purchasing futures contracts to hedge against a rise in prices, then speculators will only sell the other side of the futures contract at a higher futures price than the expected future spot price of the commodity.  The changing nature of the hedgers and speculators in the commodities markets will influence whether futures prices are above or below the expected future spot price, which can have significant implications for the Fund.  If the nature of hedgers and speculators in futures markets has shifted when it is time for the Fund to reinvest the proceeds of a maturing futures contract in a new futures contract, the Fund might reinvest at higher or lower futures prices, or choose to pursue other investments.  The commodities which underlie commodity futures contracts may be subject to additional economic and non-economic variables, such as drought, floods, weather, livestock disease, embargoes, tariffs, and international economic, political and regulatory developments.  These factors may have a larger impact

12

on commodity prices and commodity-linked instruments, including futures contracts, than on traditional securities.  Certain commodities are also subject to limited pricing flexibility because of supply and demand factors.  Others are subject to broad price fluctuations as a result of the volatility of the prices for certain raw materials and the instability of the supplies of other materials.

Futures contracts and forward contracts achieve the same economic effect: both are an agreement to purchase a specified amount of a specified asset at a specified future date for a price agreed-upon today. However, there are significant differences in the operation of the two contracts. Forward contracts are individually negotiated transactions and are not exchange traded. Therefore, with a forward contract, the Fund would make a commitment to carry out the purchase or sale of the underlying asset at expiration.

For example, if the Fund were to buy a forward contract to purchase a certain currency at a set price for delivery in three months’ time and then, two months later, the Fund wished to liquidate that position, it would contract for the sale of the currency at a new price for delivery in one month’s time. At expiration of both forward contracts, the Fund would be required to buy the currency at the set price under the first forward contract and sell it at the agreed-upon price under the second forward contract. Even though the Fund has effectively offset its currency position with the purchase and sale of the two forward contracts, it must still honor the original commitment at maturity of the two contracts. By contrast, futures exchanges have central clearinghouses which keep track of all positions. To offset a long position in a futures contract, the Fund simply needs to sell a similar contract on the exchange. The exchange clearinghouse will record both the original futures contract purchase and the offsetting sale, and there is no further commitment on the part of the Fund.

Only a very small percentage of commodity futures contracts result in actual delivery of the underlying commodity.   Additionally, any gain or loss on the purchase and sale of the futures contracts is recognized immediately upon the offset, while with a forward contract, profit or loss is recognized upon maturity of the forward contracts.

Options on Futures Contracts .  The Fund may purchase and write put and call options on foreign currency, interest rate and stock and commodity index futures contracts and may enter into closing transactions with respect to such options to terminate existing positions. There is no guarantee that such closing transactions can be effected; the ability to establish and close out positions on such options will be subject to the existence of a liquid market.

An option on a currency, interest rate or commodity or securities index futures contract, as contrasted with the direct investment in such a contract, gives the purchaser the right, in return for the premium paid, to assume a position in a futures contract at a specified exercise price at any time prior to the expiration date of the option. The writer of the option is required upon exercise to assume an offsetting futures position (a short position if the option is a call and a long position if the option is a put). Upon exercise of an option, the delivery of the futures position by the writer of the option to the holder of the option will be accompanied by delivery of the accumulated balance in the writer’s futures margin account, which represents the amount by which the market price of the futures contract exceeds, in the case of a call, or is less than, in the case of a put, the exercise price of the option on the futures contract. The potential loss related to the purchase of an option on a futures contract is limited to the premium paid for the option (plus transaction costs). Because the value of the option is fixed at the point of sale, there are no daily cash payments by the purchaser to reflect changes in the value of the underlying contract; however, the value of the option does change daily and that change would be reflected in the net asset value of the Fund.

Hedging Generally

The Fund may enter into options and futures transactions for several purposes, including generating current income to offset expenses or increase return, and as hedges to reduce investment risk, generally by making an investment expected to move in the opposite direction of a portfolio position. A hedge is designed to offset a loss in a portfolio position with a gain in the hedged position; at the same time, however, a properly correlated hedge will result in a gain in the portfolio position being offset by a loss in the hedged position. As a result, the use of options and futures transactions for hedging purposes could limit any potential gain from an increase in the value of the position hedged. In addition, the movement in the portfolio position hedged may not be of the same magnitude as movement in the hedge. With respect to futures contracts, since the value of portfolio securities will far exceed the

13

value of the futures contracts sold by the Fund, an increase in the value of the futures contracts could only mitigate, but not totally offset, the decline in the value of the Fund’s assets.

In hedging transactions based on an index, whether the Fund will realize a gain or loss depends upon movements in the level of securities prices in the stock market generally or, in the case of certain indexes, in an industry or market segment, rather than movements in the price of a particular security. The risk of imperfect correlation increases as the composition of the Fund’s portfolio varies from the composition of the index. In an effort to compensate for imperfect correlation of relative movements in the hedged position and the hedge, the Fund’s hedge positions may be in a greater or lesser dollar amount than the dollar amount of the hedged position. Such “over hedging” or “under hedging” may adversely affect the Fund’s net investment results if the markets do not move as anticipated when the hedge is established. Securities index futures transactions may be subject to additional correlation risks. First, all participants in the futures market are subject to margin deposit and maintenance requirements. Rather than meeting additional margin deposit requirements, investors may close futures contracts through offsetting transactions which would distort the normal relationship between the securities index and futures markets. Secondly, from the point of view of speculators, the deposit requirements in the futures market are less onerous than margin requirements in the securities market. Therefore, increased participation by speculators in the futures market also may cause temporary price distortions. Because of the possibility of price distortions in the futures market and the imperfect correlation between movements in the securities index and movements in the price of securities index futures, a correct forecast of general market trends by Credit Suisse still may not result in a successful hedging transaction.

The Fund will engage in hedging transactions only when deemed advisable by Credit Suisse, and successful use by the Fund of hedging transactions will be subject to Credit Suisse’s ability to predict trends in currency, interest rate or securities markets, as the case may be, and to predict correctly movements in the directions of the hedge and the hedged position and the correlation between them, which predictions could prove to be inaccurate. This requires different skills and techniques than predicting changes in the price of individual securities, and there can be no assurance that the use of these strategies will be successful. Even a well-conceived hedge may be unsuccessful to some degree because of unexpected market behavior or trends. Losses incurred in hedging transactions and the costs of these transactions will affect the Fund’s performance.

To the extent that the Fund engages in commodity-linked derivatives and in the strategies described herein, the Fund may experience losses greater than if these strategies had not been utilized. In addition to the risks described, these instruments may be illiquid and/or subject to trading limits, and the Fund may be unable to close out a position without incurring substantial losses, if at all. The Fund is also subject to the risk of a default by a counterparty to an over-the-counter (“OTC”) transaction.

Investment Grade Securities

Investment grade debt securities are rated in one of the four highest rating categories by Moody’s or S&P, or if unrated, are determined by Credit Suisse to be of comparable quality. If a debt security receives different ratings from Moody’s, S&P, or another nationally recognized statistical rating organization, Credit Suisse will treat the debt security as being rated in the highest of the rating categories. Moody’s considers debt securities rated Baa (its lowest investment grade rating) to have speculative characteristics. This means that changes in economic conditions or other circumstances are more likely to lead to a weakened capacity to make principal and interest payments than is the case for higher rated bonds.

Moody’s and S&P are private services that provide ratings of the credit quality of debt securities and certain other securities. A description of the ratings assigned to corporate bonds by Moody’s and S&P is included in Appendix B to this SAI .

Credit ratings attempt to evaluate the safety of principal and interest payments, but they do not evaluate the volatility of a debt security’s value or its liquidity and do not guarantee the performance of the issuer. Rating agencies may fail to make timely changes in credit ratings in response to subsequent events, so that an issuer’s current financial condition may be better or worse than the rating indicates. There is a risk that rating agencies may downgrade a debt security’s rating. Subsequent to a security’s purchase by the Fund, it may cease to be rated or its rating may be reduced below the minimum rating required for purchase by the Fund. Neither event will require the

14

sale of such securities, although Credit Suisse will consider such event in its determination of whether the Fund should continue to hold the security. Credit Suisse may use these ratings in determining whether to purchase, sell or hold a security. It should be emphasized, however, that ratings are general and are not absolute standards of quality. Consequently, bonds with the same maturity, interest rate and rating may have different market prices.

Lending of Portfolio Securities

The Fund may lend portfolio securities to brokers, dealers and other financial organizations that meet capital and other credit requirements or other criteria established by the Board. These loans, if and when made, may not exceed 33 1/3% of the Fund’s total assets taken at value (including the loan collateral). Loans of portfolio securities will be collateralized by cash or liquid securities, which are maintained at all times in an amount equal to at least 100% of the current market value of the loaned securities. Any gain or loss in the market price of the securities loaned that might occur during the term of the loan would be for the account of the Fund. From time to time, the Fund may return a part of the interest earned from the investment of collateral received for securities loaned to the borrower and/or a third party that is unaffiliated with the Fund and that is acting as a “finder.”

By lending its securities, the Fund can increase its income by continuing to receive interest and any dividends on the loaned securities as well as by either investing the collateral received for securities loaned in short-term instruments or obtaining yield in the form of interest paid by the borrower when U.S. government securities are used as collateral. The Fund will adhere to the following conditions whenever its portfolio securities are loaned: (i) the Fund must receive at least 100% cash collateral or equivalent securities of the type discussed in the preceding paragraph from the borrower; (ii) the borrower must increase such collateral whenever the market value of the securities rises above the level of such collateral; (iii) the Fund must be able to terminate the loan at any time; (iv) the Fund must receive reasonable interest on the loan, as well as any dividends, interest or other distributions on the loaned securities and any increase in market value; (v) the Fund may pay only reasonable custodian fees in connection with the loan; and (vi) voting rights on the loaned securities may pass to the borrower, provided, however, that if a material event adversely affecting the investment occurs, the Fund must terminate the loan and regain the right to vote the securities. Loan agreements involve certain risks in the event of default or insolvency of the other party including possible delays or restrictions upon the Fund’s ability to recover the loaned securities or dispose of the collateral for the loan. Default by or bankruptcy of a borrower would expose the Fund to possible loss because of adverse market action, expenses and/or delays in connection with the disposition of underlying securities. The Fund also could lose money if its short-term investment of the cash collateral declines in value over the period of the loan. Any loans of the Fund’s securities will be fully collateralized and marked to market daily.

Payments received by the Fund in lieu of any dividends paid on the loaned securities will not be treated as “qualified dividend income” for purposes of determining what portion of the Fund’s dividends received by individuals may be taxed at the rates generally applicable to long-term capital gains (see “Additional Information Concerning Taxes” below).

Mezzanine Investments

The Fund may invest in certain high yield securities known as mezzanine investments, which are subordinated debt securities that are generally issued in private placements in connection with an equity security (e.g., with attached warrants). Such mezzanine investments may be issued with or without registration rights. Similar to other high yield securities, maturities of mezzanine investments are typically seven to ten years, but the expected average life is significantly shorter at three to five years. Mezzanine investments are usually unsecured and subordinate to other obligations of the issuer.

Money Market Instruments

Money market instruments are short-term instruments that consist of obligations issued or guaranteed by the U.S. government, its agencies or instrumentalities (“Government Securities”); bank obligations (including certificates of deposit, time deposits and bankers’ acceptances of domestic or foreign banks, domestic savings and loans and similar institutions) that are high quality investments or, if unrated, deemed by Credit Suisse to be high quality investments; commercial paper rated no lower than A-2 by S&P, or Prime-2 by Moody’s, or the equivalent from another major rating service or, if unrated, of an issuer having an outstanding, unsecured debt issue then rated

15

within the three highest rating categories; obligations of foreign governments, their agencies or instrumentalities; and repurchase agreements with respect to portfolio securities. A description of S&P’s and Moody’s ratings is in Appendix B to this SAI .

Mortgage-Backed Securities

The Fund may invest in mortgage-backed securities, such as those issued by GNMA, Fannie Mae, Freddie Mac and certain foreign issuers, as well as non-governmental issuers. Non-government issued mortgage-backed securities may offer higher yields than those issued by government entities, but may be subject to greater price fluctuations. Mortgage-backed securities represent direct or indirect participations in, or are secured by and payable from, mortgage loans secured by real property. These securities generally are “pass-through” instruments, through which the holders receive a share of all interest and principal payments from the mortgages underlying the securities, net of certain fees. Some mortgage-backed securities, such as CMOs, make payouts of both principal and interest at a variety of intervals; others make semiannual interest payments at a predetermined rate and repay principal at maturity (like a typical bond). The mortgages backing these securities include, among other mortgage instruments, conventional 30-year fixed-rate mortgages, 15-year fixed-rate mortgages, graduated payment mortgages and adjustable rate mortgages. The government or the issuing agency typically guarantees the payment of interest and principal of these securities. However, the guarantees do not extend to the securities’ yield or value, which are likely to vary inversely with fluctuations in interest rates, nor do the guarantees extend to the yield or value of the Fund’s shares.

Yields on pass-through securities are typically quoted by investment dealers and vendors based on the maturity of the underlying instruments and the associated average life assumption. The average life of pass-through pools varies with the maturities of the underlying mortgage loans. A pool’s term may be shortened by unscheduled or early payments of principal on the underlying mortgages. The occurrence of mortgage prepayments is affected by various factors, including the level of interest rates, general economic conditions, the location, scheduled maturity and age of the mortgage and other social and demographic conditions. Because prepayment rates of individual pools vary widely, it is not possible to predict accurately the average life of a particular pool. For pools of fixed-rate 30-year mortgages in a stable fixed-rate environment, a common industry practice in the U.S. has been to assume that prepayments will result in a 12-year average life. At present, pools, particularly those with loans with other maturities or different characteristics, are priced on an assumption of average life determined for each pool. In periods of falling interest rates, the rate of prepayment tends to increase, thereby shortening the actual average life of a pool of mortgage-related securities. Conversely, in periods of rising rates the rate of prepayment tends to decrease, thereby lengthening the actual average life of the pool. However, these effects may not be present, or may differ in degree, if the mortgage loans in the pools have adjustable interest rates or other special payment terms, such as a prepayment charge. Actual prepayment experience may cause the yield of mortgage-backed securities to differ from the assumed average life yield. Reinvestment of prepayments may occur at higher or lower interest rates than the original investment, thus affecting the Fund’s yield.

The rate of interest on mortgage-backed securities is lower than the interest rates paid on the mortgages included in the underlying pool due to the annual fees paid to the servicer of the mortgage pool for passing through monthly payments to certificate holders and to any guarantor, such as GNMA, and due to any yield retained by the issuer. Actual yield to the holder may vary from the coupon rate, even if adjustable, if the mortgage-backed securities are purchased or traded in the secondary market at a premium or discount. In addition, there is normally some delay between the time the issuer receives mortgage payments from the servicer and the time the issuer makes the payments on the mortgage-backed securities, and this delay reduces the effective yield to the holder of such securities.

To-Be-Announced Mortgage-Backed Securities.   As with other delayed-delivery transactions, a seller agrees to issue a to-be-announced mortgage-backed security (a “TBA”) at a future date. A TBA transaction arises when a mortgage-backed security, such as a GNMA pass-through security, is purchased or sold with specific pools that will constitute that GNMA pass-through security to be announced on a future settlement date. However, at the time of purchase, the seller does not specify the particular mortgage-backed securities to be delivered. Instead, the Fund agrees to accept any mortgage-backed security that meets specified terms. Thus, the Fund and the seller would agree upon the issuer, interest rate and terms of the underlying mortgages, but the seller would not identify the

16

specific underlying mortgages until shortly before it issues the mortgage-backed security. TBAs increase interest rate risks because the underlying mortgages may be less favorable than anticipated by the Fund.

Non-Diversified Status

The Fund is classified as non-diversified within the meaning of the 1940 Act, which means that it is not limited by such Act in the proportion of its assets that it may invest in securities of a single issuer. As a non-diversified investment company, the Fund may invest a greater proportion of its assets in the obligations of a small number of issuers and, as a result, may be subject to greater risk with respect to portfolio securities. To the extent that the Fund assumes large positions in the securities of a small number of issuers, its return may fluctuate to a greater extent than that of a diversified company as a result of changes in the financial condition or in the market’s assessment of the issuers.

The Fund’s investments will be limited, however, in order to qualify as a “regulated investment company” for purposes of the Code. See “Additional Information Concerning Taxes.” To qualify, the Fund will comply with certain requirements, including limiting its investments so that at the close of each quarter of the taxable year (i) not more than 25% of the market value of its total assets will be invested in the securities of a single issuer, and (ii) with respect to 50% of the market value of its total assets, not more than 5% of the market value of its total assets will be invested in the securities of a single issuer and the Fund will not own more than 10% of the outstanding voting securities of a single issuer.

Non-Publicly Traded and Illiquid Securities

The Fund may invest up to 15% of its net assets in non-publicly traded and illiquid securities, including securities that are illiquid by virtue of the absence of a readily available market, repurchase agreements which have a maturity of longer than seven days, variable rate demand notes (“VRDNs”) and master demand notes providing for settlement upon more than seven days’ notice by the Fund, and time deposits maturing in more than seven calendar days. Repurchase agreements subject to demand are deemed to have a maturity equal to the notice period. Securities that have legal or contractual restrictions on resale but have a readily available market are not considered illiquid for purposes of this limitation.

Historically, illiquid securities have included securities subject to contractual or legal restrictions on resale because they have not been registered under the Securities Act of 1933, as amended (the “Securities Act”), securities which are otherwise not readily marketable and repurchase agreements having a maturity of longer than seven days. Securities which have not been registered under the Securities Act are referred to as private placements or restricted securities and are purchased directly from the issuer or in the secondary market. Companies whose securities are not publicly traded may not be subject to the disclosure and other investor protection requirements applicable to companies whose securities are publicly traded. Limitations on resale may have an adverse effect on the marketability of portfolio securities and a mutual fund might be unable to dispose of restricted or other illiquid securities promptly or at reasonable prices and might thereby experience difficulty satisfying redemptions within seven days. A mutual fund might also have to register such restricted securities in order to dispose of them resulting in additional expense and delay. Adverse market conditions could impede such a public offering of securities.

However, a large institutional market has developed for certain securities that are not registered under the Securities Act including repurchase agreements, commercial paper, foreign securities, municipal securities and corporate bonds and notes. Institutional investors depend on an efficient institutional market in which the unregistered security can be readily resold or on an issuer’s ability to honor a demand for repayment. The fact that there are contractual or legal restrictions on resale to the general public or to certain institutions may not be indicative of the liquidity of such investments.

Non-publicly traded securities (including Rule 144A Securities) may involve a high degree of business and financial risk and may result in substantial losses. These securities may be less liquid than publicly traded securities, and the Fund may take longer to liquidate these positions than would be the case for publicly traded securities. Although these securities may be resold in privately negotiated transactions, the prices realized from these sales could be less than those originally paid by the Fund. Further, companies whose securities are not publicly traded may not be subject to the disclosure and other investor protection requirements that would be applicable if their securities were publicly traded. The Fund’s investment in illiquid securities is subject to the risk that should the Fund desire to sell any of these securities when a ready buyer is not available at a price that is deemed to be representative of their value, the value of the Fund’s net assets could be adversely affected.

Rule 144A Securities.   Rule 144A under the Securities Act adopted by the SEC allows for a broader institutional trading market for securities otherwise subject to restriction on resale to the general public. Rule 144A establishes a “safe harbor” from the registration requirements of the Securities Act for resales of certain securities to qualified institutional buyers. Credit Suisse anticipates that the market for certain restricted securities such as institutional commercial paper will expand further as a result of this regulation and use of automated systems for the trading, clearance and settlement of unregistered securities of domestic and foreign issuers, such as the PORTAL System sponsored by the NASDAQ Stock Market, Inc.

An investment in Rule 144A Securities will be considered illiquid and, therefore, subject to the Fund’s limit on the purchase of illiquid securities unless the Board or its delegates determines that the Rule 144A Securities are liquid. In reaching liquidity decisions, the Board or its delegates may consider, inter alia, the following factors: (i) the unregistered nature of the security; (ii) the frequency of trades and quotes for the security; (iii) the number of dealers wishing to purchase or sell the security and the number of other potential purchasers; (iv) dealer undertakings to make a market in the security; and (v) the nature of the security and the nature of the marketplace

17

trades (e.g., the time needed to dispose of the security, the method of soliciting offers and the mechanics of the transfer).

Investing in Rule 144A securities could have the effect of increasing the level of illiquidity in the Fund to the extent that qualified institutional buyers are unavailable or uninterested in purchasing such securities from the Fund. The Board has adopted guidelines and delegated to Credit Suisse the daily function of determining and monitoring the liquidity of Rule 144A Securities, although the Board will retain ultimate responsibility for liquidity determinations.

Options

The Fund may purchase and write (sell) options on securities, securities indices, currencies, swap agreements and commodity indexes for hedging purposes or to increase total return.

Securities Options.   The Fund may write covered put and call options on stock and/or debt securities and may purchase such options that are traded on foreign and U.S. exchanges, as well as OTC options. The Fund realizes fees (referred to as “premiums”) for granting the rights evidenced by the options it has written. A put option embodies the right of its purchaser to compel the writer of the option to purchase from the option holder an underlying security at a specified price for a specified time period or at a specified time. In contrast, a call option embodies the right of its purchaser to compel the writer of the option to sell to the option holder an underlying security at a specified price for a specified time period or at a specified time.

The potential loss associated with purchasing an option is limited to the premium paid, and the premium would partially offset any gains achieved from its use. However, for an option writer the exposure to adverse price movements in the underlying security or index is potentially unlimited during the exercise period. Writing securities options may result in substantial losses to the Fund, force the sale or purchase of portfolio securities at inopportune times or at less advantageous prices, limit the amount of appreciation the Fund could realize on its investments or require the Fund to hold securities it would otherwise sell.

The principal reason for writing covered options on a security is to attempt to realize, through the receipt of premiums, a greater return than would be realized on the securities alone. In return for a premium, the Fund as the writer of a covered call option forfeits the right to any appreciation in the value of the underlying security above the strike price for the life of the option (or until a closing purchase transaction can be effected). When the Fund writes call options, it retains the risk of a decline in the price of the underlying security. The size of the premiums that the Fund may receive may be adversely affected as new or existing institutions, including other investment companies, engage in or increase their option-writing activities.

If security prices rise, a put writer would generally expect to profit, although its gain would be limited to the amount of the premium it received. If security prices remain the same over time, it is likely that the writer will also profit, because it should be able to close out the option at a lower price. If security prices decline, the put writer would expect to suffer a loss. This loss may be less than the loss from purchasing the underlying instrument directly to the extent that the premium received offsets the effects of the decline.

In the case of options written by the Fund that are deemed covered by virtue of the Fund’s holding convertible or exchangeable preferred stock or debt securities, the time required to convert or exchange and obtain physical delivery of the underlying common stock with respect to which the Fund has written options may exceed the time within which the Fund must make delivery in accordance with an exercise notice. In these instances, the Fund may purchase or temporarily borrow the underlying securities for purposes of physical delivery. By so doing, the Fund will not bear any market risk, since the Fund will have the absolute right to receive from the issuer of the underlying security an equal number of shares to replace the borrowed securities, but the Fund may incur additional transaction costs or interest expenses in connection with any such purchase or borrowing.

Additional risks exist with respect to certain of the securities for which the Fund may write covered call options. For example, if the Fund writes covered call options on mortgage-backed securities, the mortgage-backed securities that it holds as cover may, because of scheduled amortization or unscheduled prepayments, cease to be

18

sufficient cover. If this occurs, the Fund will compensate for the decline in the value of the cover by purchasing an appropriate additional amount of mortgage-backed securities.

Options written by the Fund will normally have expiration dates between one and nine months from the date written. The exercise price of the options may be below, equal to or above the market values of the underlying securities at the times the options are written. In the case of call options, these exercise prices are referred to as “in-the-money,” “at-the-money” and “out-of-the-money,” respectively. The Fund may write (i) in-the-money call options when Credit Suisse expects that the price of the underlying security will remain flat or decline moderately during the option period, (ii) at-the-money call options when Credit Suisse expects that the price of the underlying security will remain flat or advance moderately during the option period and (iii) out-of-the-money call options when Credit Suisse expects that the premiums received from writing the call option plus the appreciation in market price of the underlying security up to the exercise price will be greater than the appreciation in the price of the underlying security alone. In any of the preceding situations, if the market price of the underlying security declines and the security is sold at this lower price, the amount of any realized loss will be offset wholly or in part by the premium received. Out-of-the-money, at-the-money and in-the-money put options (the reverse of call options as to the relation of exercise price to market price) may be used in the same market environments that such call options are used in equivalent transactions. To secure its obligation to deliver the underlying security when it writes a call option, the Fund will be required to deposit in escrow the underlying security or other assets in accordance with the rules of the Options Clearing Corporation (the “Clearing Corporation”) and of the securities exchange on which the option is written.

Prior to their expirations, put and call options may be sold in closing sale or purchase transactions (sales or purchases by the Fund prior to the exercise of options that it has purchased or written, respectively, of options of the same series) in which the Fund may realize a profit or loss from the sale. An option position may be closed out only where there exists a secondary market for an option of the same series on a recognized securities exchange or in the OTC market. When the Fund has purchased an option and engages in a closing sale transaction, whether the Fund realizes a profit or loss will depend upon whether the amount received in the closing sale transaction is more or less than the premium the Fund initially paid for the original option plus the related transaction costs. Similarly, in cases where the Fund has written an option, it will realize a profit if the cost of the closing purchase transaction is less than the premium received upon writing the original option and will incur a loss if the cost of the closing purchase transaction exceeds the premium received upon writing the original option. The Fund may engage in a closing purchase transaction to realize a profit, to prevent an underlying security with respect to which it has written an option from being called or put or, in the case of a call option, to unfreeze an underlying security (thereby permitting its sale or the writing of a new option on the security prior to the outstanding option’s expiration). The obligation of the Fund under an option it has written would be terminated by a closing purchase transaction (the Fund would not be deemed to own an option as a result of the transaction). So long as the obligation of the Fund as the writer of an option continues, the Fund may be assigned an exercise notice by the broker-dealer through which the option was sold, requiring the Fund to deliver the underlying security against payment of the exercise price. This obligation terminates when the option expires or the Fund effects a closing purchase transaction. The Fund cannot effect a closing purchase transaction with respect to an option once it has been assigned an exercise notice.

There is no assurance that sufficient trading interest will exist to create a liquid secondary market on a securities exchange for any particular option or at any particular time, and for some options no such secondary market may exist. A liquid secondary market in an option may cease to exist for a variety of reasons. In the past, for example, higher than anticipated trading activity or order flow or other unforeseen events have at times rendered certain of the facilities of the Clearing Corporation and various securities exchanges inadequate and resulted in the institution of special procedures, such as trading rotations, restrictions on certain types of orders or trading halts or suspensions in one or more options. There can be no assurance that similar events, or events that may otherwise interfere with the timely execution of customers’ orders, will not recur. In such event, it might not be possible to effect closing transactions in particular options. Moreover, the Fund’s ability to terminate options positions established in the OTC market may be more limited than for exchange-traded options and may also involve the risk that securities dealers participating in OTC transactions would fail to meet their obligations to the Fund. The Fund, however, will purchase OTC options only from dealers whose debt securities, as determined by Credit Suisse, are considered to be investment grade. If, as a covered call option writer, the Fund is unable to effect a closing purchase transaction in a secondary market, it will not be able to sell the underlying security and would continue to be at market risk on the security.

19

Securities exchanges generally have established limitations governing the maximum number of calls and puts of each class which may be held or written, or exercised within certain time periods by an investor or group of investors acting in concert (regardless of whether the options are written on the same or different securities exchanges or are held, written or exercised in one or more accounts or through one or more brokers). It is possible that the Fund and other clients of Credit Suisse and certain of its affiliates may be considered to be such a group. A securities exchange may order the liquidation of positions found to be in violation of these limits and it may impose certain other sanctions. These limits may restrict the number of options the Fund will be able to purchase on a particular security.

Securities and Commodities Index Options .   The Fund may purchase and write exchange- and/or board of trade-listed and OTC put and call options on securities and commodities indexes. A securities index measures the movement of a certain group of securities by assigning relative values to the securities included in the index, fluctuating with changes in the market values of the securities included in the index. A commodities index measures the movement of a certain group of commodities by assigning relative values to the commodities included in the index, fluctuating with changes in the market values of the commodities included in the index.  Some securities index options are based on a broad market index, such as the NYSE Composite Index, or a narrower market index, such as the Standard & Poor’s 100. Indexes may also be based on a particular industry or market segment.

Options on securities and commodities indexes are similar to options on securities and commodities, respectively, except that the delivery requirements are different. Instead of giving the right to take or make delivery of securities or commodities, respectively, at a specified price, an option on a securities or commodities index gives the holder the right to receive a cash “exercise settlement amount” equal to (a) the amount, if any, by which the fixed exercise price of the option exceeds (in the case of a put) or is less than (in the case of a call) the closing value of the underlying index on the date of exercise, multiplied by (b) a fixed “index multiplier.” Receipt of this cash amount will depend upon the closing level of the securities or commodities index upon which the option is based being greater than, in the case of a call, or less than, in the case of a put, the exercise price of the index and the exercise price of the option times a specified multiple. The writer of the option is obligated, in return for the premium received, to make delivery of this amount. Securities and commodities index options may be offset by entering into closing transactions as described above for securities and commodities options.

Uncovered Options Transactions.   The Fund may write options that are not covered (or so called “naked options”) on portfolio securities. When the Fund sells an uncovered call option, it does not simultaneously have a long position in the underlying security. When the Fund sells an uncovered put option, it does not simultaneously have a short position in the underlying security. Uncovered options are riskier than covered options because there is no underlying security held by the Fund that can act as a partial hedge. Uncovered calls have speculative characteristics and the potential for loss is unlimited. There is also a risk, especially with less liquid preferred and debt securities, that the securities may not be available for purchase. Uncovered put options have speculative characteristics and the potential loss is substantial.

OTC Options.   The Fund may purchase OTC or dealer options or sell covered OTC options. Unlike exchange-listed options where an intermediary or clearing corporation, such as the Clearing Corporation, assures that all transactions in such options are properly executed, the responsibility for performing all transactions with respect to OTC options rests solely with the writer and the holder of those options. A listed call option writer, for example, is obligated to deliver the underlying securities to the clearing organization if the option is exercised, and the clearing organization is then obligated to pay the writer the exercise price of the option. If the Fund were to purchase a dealer option, however, it would rely on the dealer from whom it purchased the option to perform if the option were exercised. If the dealer fails to honor the exercise of the option by the Fund, the Fund would lose the premium it paid for the option and the expected benefit of the transaction.

Exchange-traded options generally have a continuous liquid market while OTC or dealer options do not. Consequently, the Fund will generally be able to realize the value of a dealer option it has purchased only by exercising it or reselling it to the dealer who issued it. Similarly, when the Fund writes a dealer option, it generally will be able to close out the option prior to its expiration only by entering into a closing purchase transaction with the dealer to which the Fund originally wrote the option. Although the Fund will seek to enter into dealer options only with dealers who will agree to and that are expected to be capable of entering into closing transactions with the Fund, there can be no assurance that the Fund will be able to liquidate a dealer option at a favorable price at any

20

time prior to expiration. The inability to enter into a closing transaction may result in material losses to the Fund. Until the Fund, as a covered OTC call option writer, is able to effect a closing purchase transaction, it will not be able to liquidate securities (or other assets) used to cover the written option until the option expires or is exercised. This requirement may impair the Fund’s ability to sell portfolio securities or, with respect to currency options, currencies at a time when such sale might be advantageous.

Options on Swaps (“Swaptions”).   The Fund may purchase and sell put and call options on swap agreements, commonly referred to as swaptions. The Fund will enter into such transactions for hedging purposes or to seek to increase total return. Swaptions are highly specialized investments and are not traded on or regulated by any securities exchange or regulated by the CFTC or the SEC.

The buyer of a swaption pays a non-refundable premium for the option and obtains the right, but not the obligation, to enter into an underlying swap on agreed-upon terms. The seller of a swaption, in exchange for the premium, becomes obligated (if the option is exercised) to enter into an underlying swap on agreed-upon terms.

As with other options on securities, commodities, indices, or futures contracts, the price of any swaption will reflect both an intrinsic value component, which may be zero, and a time premium component. The intrinsic value component represents what the value of the swaption would be if it were immediately exercisable into the underlying swap. The intrinsic value component measures the degree to which an option is in-the-money, if at all. The time premium represents the difference between the actual price of the swaption and the intrinsic value.

The pricing and valuation terms of swaptions are not standardized and there is no clearinghouse whereby a party to the agreement can enter into an offsetting position to close out a contract. Swaptions must thus be regarded as inherently illiquid.

The use of swaptions, as the foregoing discussion suggests, is subject to risks and complexities beyond what might be encountered with investing directly in the securities and other traditional investments that are the referenced asset for the swap or other standardized, exchange traded options and futures contracts. Such risks include operational risks, valuation risks, credit risks, and/or counterparty risk (i.e., the risk that the counterparty cannot or will not perform its obligations under the agreement). In addition, at the time the swaption reaches its scheduled termination date, there is a risk that the Fund will not be able to obtain a replacement transaction or that the terms of the replacement will not be as favorable as on the expiring transaction. If this occurs, it could have a negative impact on the performance of the Fund.

While the Fund may utilize swaptions for hedging purposes or to seek to increase total return, their use might result in poorer overall performance for the Fund than if it had not engaged in any such transactions. If, for example, the Fund had insufficient cash, it might have to sell or pledge a portion of its underlying portfolio of securities in order to meet daily mark-to-market collateralization requirements at a time when it might be disadvantageous to do so. There may be an imperfect correlation between the Fund’s portfolio holdings and swaptions entered into by the Fund, which may prevent the Fund from achieving the intended hedge or expose the Fund to risk of loss. Further, the Fund’s use of swaptions to reduce risk involves costs and will be subject to Credit Suisse’s ability to predict correctly changes in interest rate relationships or other factors. No assurance can be given that Credit Suisse’s judgment in this respect will be correct.

Preferred Stock

Preferred stock is subordinated to any debt the issuer has outstanding. Accordingly, preferred stock dividends are not paid until all debt obligations are first met. Preferred stock may be subject to more fluctuations in market value, due to changes in market participants’ perceptions of the issuer’s ability to continue to pay dividends, than debt of the same issuer.

REITs

The Fund may invest in real estate investment trusts (“REITs”), which are pooled investment vehicles that invest primarily in income-producing real estate or real estate related loans or interests. Like regulated investment companies such as the Fund, REITs are not taxed on income distributed to shareholders provided they comply with

21

several requirements of the Code. When the Fund invests in a REIT, it will indirectly bear its proportionate share of any expenses paid by the REIT in addition to the expenses of the Fund.

Investing in REITs involves certain risks. A REIT may be affected by changes in the value of the underlying property owned by such REIT or by the quality of any credit extended by the REIT. REITs are dependent on management skills, are not diversified (except to the extent the Code requires), and are subject to the risks of financing projects. REITs are subject to heavy cash flow dependency, default by borrowers, self-liquidation, the possibilities of failing to qualify for the exemption from tax for distributed income under the Code and failing to maintain their exemptions from the 1940 Act. REITs are also subject to interest rate risks.

Repurchase Agreements

The Fund may enter into repurchase agreement transactions with member banks of the Federal Reserve System and certain non-bank dealers. Repurchase agreements are contracts under which the buyer of a security simultaneously commits to resell the security to the seller at an agreed-upon price and date. Under the terms of a typical repurchase agreement, the Fund would acquire any underlying security for a relatively short period (usually not more than one week) subject to an obligation of the seller to repurchase, and the Fund to resell, the obligation at an agreed-upon price and time, thereby determining the yield during the Fund’s holding period. This arrangement results in a fixed rate of return that is not subject to market fluctuations during the Fund’s holding period. The value of the underlying securities will at all times be at least equal to the total amount of the purchase obligation, including interest. The Fund bears a risk of loss in the event that the other party to a repurchase agreement defaults on its obligations or becomes bankrupt and the Fund is delayed or prevented from exercising its right to dispose of the collateral securities, including the risk of a possible decline in the value of the underlying securities during the period while the Fund seeks to assert this right. Credit Suisse monitors the creditworthiness of those bank and non-bank dealers with which the Fund enter into repurchase agreements to evaluate this risk. A repurchase agreement is considered to be a loan under the 1940 Act.

Reverse Repurchase Agreements

The Fund may enter into reverse repurchase agreements with member banks of the Federal Reserve System and certain non-bank dealers with respect to portfolio securities. Reverse repurchase agreements involve the sale of securities held by the Fund pursuant to its agreement to repurchase them at a mutually agreed-upon date, price and rate of interest. At the time the Fund enters into a reverse repurchase agreement, it will segregate with an approved custodian cash or liquid high-grade debt securities having a value not less than the repurchase price (including accrued interest). The segregated assets will be marked-to-market daily and additional assets will be segregated on any day in which the assets fall below the repurchase price (plus accrued interest). The Fund’s liquidity and ability to manage its assets might be affected when it sets aside cash or portfolio securities to cover such commitments. Reverse repurchase agreements that are accounted for as financings are considered to be borrowings under the 1940 Act.

Reverse repurchase agreements involve the risk that the market value of the securities retained in lieu of sale may decline below the price of the securities the Fund has sold but is obligated to repurchase. In the event the buyer of securities under a reverse repurchase agreement files for bankruptcy or becomes insolvent, such buyer or its trustee or receiver may receive an extension of time to determine whether to enforce the Fund’s obligation to repurchase the securities, and the Fund’s use of the proceeds of the reverse repurchase agreement may effectively be restricted pending such decision.

Rights Offerings and Purchase Warrants

Rights offerings and purchase warrants are privileges issued by a corporation which enable the owner to subscribe to and purchase a specified number of shares of the corporation at a specified price during a specified period of time. Subscription rights normally have a short lifespan to expiration. The purchase of rights or warrants involves the risk that the Fund could lose the purchase value of a right or warrant if the right to subscribe to additional shares is not executed prior to the rights and warrants expiration. Also, the purchase of rights or warrants involves the risk that the effective price paid for the rights or warrants in addition to the subscription price of the

22

related security may exceed the value of the subscribed security’s market price when, for example, there is no movement in the level of the underlying security.

Securities of Other Investment Companies

The Fund may invest in securities of other investment companies (including investment companies advised by Credit Suisse) to the extent permitted under the 1940 Act or pursuant to an SEC order. Presently, under the 1940 Act, the Fund may hold securities of another investment company in amounts which (i) do not exceed 3% of the total outstanding voting stock of such company, (ii) do not exceed 5% of the value of the Fund’s total assets and (iii) when added to all other investment company securities held by the Fund, do not exceed 10% of the value of the Fund’s total assets. Pursuant to the 1940 Act or exemptive orders from the SEC upon which the Fund rely or may rely, these percentage limitations, under certain circumstances, do not apply to investments in other Credit Suisse Fund and investments in certain ETFs with which the Fund have entered into participation agreements. As a shareholder of another investment company, the Fund would bear, along with other shareholders, its pro rata portion of the other investment company’s expenses, including advisory fees. These expenses would be in addition to the advisory and other expenses that the Fund bears directly in connection with its own operations.

Money Market Mutual Funds.   The Fund may invest in securities of money market mutual funds, including those that are affiliated with the Fund or Credit Suisse, when Credit Suisse believes that it would be beneficial to the Fund and appropriate considering the factors of return and liquidity. A money market mutual fund is an investment company that invests in short-term high quality money market instruments. A money market mutual fund generally does not purchase securities with a remaining maturity of more than one year. As a shareholder in any mutual fund, the Fund will bear its ratable share of the mutual fund’s expenses, including management fees, and will remain subject to payment of the Fund’s management fees and other expenses with respect to assets so invested.

Senior Loans

Senior secured floating rate loans (“Senior Loans”) are loans and loan participations (collectively, “Loans”) that are senior secured floating rate Loans. Senior Loans are made to corporations and other non-governmental entities and issuers. Senior Loans typically hold the most senior position in the capital structure of the issuing entity, are typically secured with specific collateral and typically have a claim on the assets and/or stock of the borrower that is senior to that held by subordinated debt holders and stockholders of the borrower. The proceeds of Senior Loans primarily are used to finance leveraged buyouts, recapitalizations, mergers, acquisitions, stock repurchases, dividends, and, to a lesser extent, to finance internal growth and for other corporate purposes. Senior Loans typically have rates of interest that are determined daily, monthly, quarterly or semi-annually by reference to a base lending rate, plus a premium or credit spread. Base lending rates in common usage today are primarily the London Interbank Offered Rate (“LIBOR”), and secondarily the prime rate offered by one or more major U.S. banks (the “Prime Rate”) and the certificate of deposit (“CD”) rate or other base lending rates used by commercial lenders.

The risks associated with Senior Loans of below investment grade quality are similar to the risks of bonds rated below investment grade, although Senior Loans are typically senior and secured in contrast to bonds rated below investment grade, which are generally subordinated and unsecured. Senior Loans’ higher standing has historically resulted in generally higher recoveries in the event of a corporate reorganization. In addition, because their interest payments are adjusted for changes in short-term interest rates, investments in Senior Loans generally have less interest rate risk than below-investment-grade rated bonds. The Fund’s investments in Senior Loans are expected to typically be below investment grade, which are considered speculative because of the credit risk of their issuers. Such companies are more likely to default on their payments of interest and principal owed to the Fund, and such defaults could reduce the Fund’s net asset value and income distributions. An economic downturn generally leads to a higher non-payment rate, and a debt obligation may lose significant value before a default occurs. Moreover, any specific collateral used to secure a Loan may decline in value or become illiquid, which would adversely affect the Loan’s value.

Like other debt instruments, Senior Loans are subject to the risk of non-payment of scheduled interest or principal. Such non-payment would result in a reduction of income to the Fund, a reduction in the value of the investment and a potential decrease in the net asset value per share of the Fund. There can be no assurance that the

23

liquidation of any collateral securing a Loan would satisfy the borrower’s obligation in the event of non-payment of scheduled interest or principal payments, or that such collateral could be readily liquidated. Senior Loans are also subject to heightened prepayment risk, as they usually have mandatory and optional prepayment provisions. In the event of bankruptcy of a borrower, the Fund could experience delays or limitations with respect to its ability to realize the benefits of the collateral securing a Senior Loan. The collateral securing a Senior Loan may lose all or substantially all of its value in the event of bankruptcy of a borrower. In the event of default, the Fund may have difficulty collecting on any collateral. Some Senior Loans are subject to the risk that a court, pursuant to fraudulent conveyance or other similar laws, could subordinate such Senior Loans to presently existing or future indebtedness of the borrower or take other action detrimental to the holders of Senior Loans including, in certain circumstances, invalidating such Senior Loans or causing interest previously paid to be refunded to the borrower. Due to the above factors, a collateralized Senior Loan may not be fully collateralized and may decline significantly in value. If interest were required to be refunded, it could negatively affect the Fund’s performance.

The Fund may purchase and retain in its portfolio Senior Loans where the borrowers have experienced, or may be perceived to be likely to experience, credit problems, including default, involvement in or recent emergence from bankruptcy reorganization proceedings or other forms of debt restructuring. At times, in connection with the restructuring of a Senior Loan either outside of bankruptcy court or in the context of bankruptcy court proceedings, the Fund may determine or be required to accept equity securities or junior debt securities in exchange for all or a portion of a Senior Loan.

Senior Loans may not be rated by a nationally recognized statistical ratings organization (“NRSRO”), may not be registered with the SEC or any state securities commission, and may not be listed on any national securities exchange. The amount of public information available with respect to Senior Loans may be less extensive than available for registered or exchange-listed securities. In evaluating the creditworthiness of borrowers, Credit Suisse will consider, and may rely in part, on analyses performed by others.

Borrowers may have outstanding debt obligations that are rated below investment grade by a NRSRO. Most of the Senior Loans held by the Fund will have been assigned ratings below investment grade by a NRSRO. In the event Senior Loans are not rated, they are likely to be the equivalent of below investment grade quality. The Fund will rely on the judgment, analysis and experience of Credit Suisse in evaluating the creditworthiness of a borrower. In this evaluation, Credit Suisse will take into consideration, among other things, the borrower’s financial resources, its sensitivity to economic conditions and trends, its operating history, the quality of the borrower’s management and regulatory matters.

No active trading market may exist for some Senior Loans and some Senior Loans may be subject to restrictions on resale. Secondary markets may be subject to irregular trading activity, wide bid/ask spreads and extended trade settlement periods, which may impair the ability to realize full value and thus cause a decline in the Fund’s net asset value. During periods of limited demand and liquidity for Senior Loans, the Fund’s net asset value may be adversely affected.

Although changes in prevailing interest rates can be expected to cause some fluctuations in the value of Senior Loans (due to the fact that floating rates on Senior Loans only reset periodically), the value of Senior Loans tends to be substantially less sensitive to changes in market interest rates than fixed-rate instruments. Nevertheless, a sudden and significant increase in market interest rates may cause a decline in the value of these investments and an associated decline in the Fund’s net asset value.

Other factors (including, but not limited to, rating downgrades, credit deterioration, a large downward movement in stock prices, a disparity in supply and demand of certain investments or market conditions that reduce liquidity) can reduce the value of Senior Loans and other debt obligations, impairing the Fund’s net asset value.

The Fund may purchase Senior Loans by assignment from a participant in the original syndicate of lenders or from subsequent assignees of such interests, or can buy a participation in a loan. The Fund may also purchase participations in the original syndicate making Senior Loans. Loan participations typically represent indirect participations in a loan to a corporate borrower, and generally are offered by banks or other financial institutions or lending syndicates. When purchasing loan participations, the Fund assumes the credit risk associated with the corporate borrower and may assume the credit risk associated with an interposed bank or other financial

24

intermediary. The Fund will acquire participations only if the lender interpositioned between the Fund and the borrower is determined by Credit Suisse to be creditworthy. In circumstances where the Fund is a participant in a loan, it does not have any direct claim on the loan or any rights of set-off against the borrower and may not benefit directly from any collateral supporting the loan. In these situations, the Fund is subject to the credit risk of both the borrower and the lender that is selling the participation. In the event of the insolvency of the lender selling a participation, the Fund may be treated as a general creditor of the lender and may not benefit from any set-off between the lender and the borrower.

Economic and other events (whether real or perceived) can reduce the demand for certain Senior Loans or Senior Loans generally, which may reduce market prices and cause the Fund’s net asset value per share to fall. The frequency and magnitude of such changes cannot be predicted.

Loans and other debt instruments are also subject to the risk of price declines due to increases in prevailing interest rates, although floating-rate debt instruments are less exposed to this risk than fixed-rate debt instruments. Interest rate changes may also increase prepayments of debt obligations and require the Fund to invest assets at lower yields. No active trading market may exist for certain Loans, which may impair the ability of the Fund to realize full value in the event of the need to liquidate such assets.

Adverse market conditions may impair the liquidity of some actively traded Loans.

Short Sales

A short sale is a transaction in which the Fund sells securities it does not own in anticipation of a decline in the market price of the securities. In a short sale, the Fund sells a borrowed security and has a corresponding obligation to the lender to return the identical security. The seller does not immediately deliver the securities sold and is said to have a short position in those securities until delivery occurs.

To deliver the securities to the buyer, the Fund must arrange through a broker to borrow the securities and, in so doing, the Fund becomes obligated to replace the securities borrowed at their market price at the time of replacement, whatever that price may be. The Fund will make a profit or incur a loss as a result of a short sale depending on whether the price of the securities decreases or increases between the date of the short sale and the date on which the Fund purchases the security to replace the borrowed securities that have been sold. The amount of any loss would be increased (and any gain decreased) by any premium or interest the Fund is required to pay in connection with a short sale.

If the Fund engages in a short sale, the collateral for the short position will be maintained by the Fund’s custodian or qualified sub-custodian. While the short sale is open, the Fund will maintain in a segregated account an amount of liquid securities equal in value to its obligation to purchase the securities sold short, marked to market daily.

If the Fund effects a short sale of securities at a time when it has an unrealized gain on the securities, it may be required to recognize that gain as if it had actually sold the securities (as a “constructive sale”) on the date it effects the short sale. However, such constructive sale treatment may not apply if the Fund closes out the short sale with securities other than the appreciated securities held at the time of the short sale and if certain other conditions are satisfied. Uncertainty regarding the tax consequences of effecting short sales may limit the extent to which the Fund may effect short sales.

Alternatively, the Fund may take short positions using derivatives, such as swaps or futures. For example, the Fund may enter into a futures contract pursuant to which it agrees to sell a specified asset (that it does not currently own) at a specified future date for a specified price agreed-upon today. This gives the Fund a short position with respect to that asset. The Fund will benefit to the extent the asset decreases in value (and incur losses to the extent the asset increases in value) between the time it enters into the futures contract and the agreed date of sale.

Short Sales “Against the Box”

A short sale is “against the box” to the extent that the Fund contemporaneously owns or has the right to obtain, at no added cost, securities identical to those sold short. It may be entered into by the Fund to, for example,

25

lock in a sale price for a security the Fund does not wish to sell immediately. If the Fund engages in a short sale, the collateral for the short position will be segregated in an account with the Fund’s custodian or qualified sub-custodian. While the short sale is open, the Fund will continue to segregate an amount of securities equal in kind and amount to the securities sold short or securities convertible into or exchangeable for such equivalent securities. These securities constitute the Fund’s long position.

The Fund does not intend to engage in short sales against the box for investment purposes.

The Fund may make a short sale as a hedge, when it believes that the price of a security may decline, causing a decline in the value of a security owned by the Fund (or a security convertible or exchangeable for such security). In such case, any future losses in the Fund’s long position should be offset by a gain in the short position and, conversely, any gain in the long position should be reduced by a loss in the short position. The extent to which such gains or losses are reduced will depend upon the amount of the security sold short relative to the amount the Fund owns. There will be certain additional transaction costs associated with short sales against the box, but the Fund will endeavor to offset these costs with the income from the investment of the cash proceeds of short sales.

See “Additional Information Concerning Taxes” for a discussion of the tax consequences to the Fund of effecting short sales against the box.

“Special Situation” Companies

“Special situation” companies are companies involved in an actual or prospective acquisition or consolidation; reorganization; recapitalization; merger, liquidation or distribution of cash, securities or other assets; a tender or exchange offer; a breakup or workout of a holding company; or litigation which, if resolved favorably, would improve the value of the company’s stock. If the actual or prospective situation does not materialize as anticipated, the market price of the securities of a “special situation company” may decline significantly. Credit Suisse believes, however, that if it analyzes “special situation companies” carefully and invests in the securities of these companies at the appropriate time, it may assist the Fund in achieving its investment objective. There can be no assurance, however, that a special situation that exists at the time of its investment will be consummated under the terms and within the time period contemplated.

Structured Notes, Bonds or Debentures

Typically, the value of the principal and/or interest on structured notes, bonds and debentures is determined by reference to changes in the value of specific currencies, interest rates, indexes or other financial indicators (the “Reference”) or the relevant change in two or more References. The interest rate or the principal amount payable upon maturity or redemption may be increased or decreased depending upon changes in the applicable Reference. The terms of the structured securities may provide that in certain circumstances no principal is due at maturity and, therefore, may result in the loss of the Fund’s entire investment. The value of structured securities may move in the same or the opposite direction as the value of the Reference, so that appreciation of the Reference may produce an increase or decrease in the interest rate or value of the security at maturity. In addition, the change in interest rate or the value of the security at maturity may be a multiple of the change in the value of the Reference so that the security may be more or less volatile than the Reference, depending on the multiple. Consequently, structured securities may entail a greater degree of market risk and volatility than other types of debt obligations.

Swap Agreements

The Fund may enter into swap agreements with respect to interest rates, specific securities or commodities and indexes of securities or commodities, and mortgage, credit and event-linked swaps, and to the extent it may invest in foreign-currency denominated securities, the Fund may enter into swap agreements with respect to foreign currencies.

The Fund may enter into swap transactions for any legal purpose consistent with its investment objective and policies, such as for the purpose of attempting to obtain or preserve a particular return or spread at a lower cost than obtaining a return or spread through purchase and/or sales of instruments in other markets, to seek to increase total return (speculation), to protect against currency fluctuations, as a duration management technique, to protect

26

against any increase in the price of securities the Fund anticipates purchasing at a later date, or to gain exposure to certain markets in the most economical way possible.

Swap agreements are two-party contracts entered into primarily by institutional investors for periods ranging from a few weeks to more than one year. In a standard “swap” transaction, two parties agree to exchange the returns (or differentials in rates of return) earned or realized on particular predetermined investments or instruments, which may be adjusted for an interest factor. The gross returns to be exchanged or “swapped” between the parties are generally calculated with respect to a “notional amount,” i.e., the return on or increase in value of a particular dollar amount invested at a particular interest rate, in a particular foreign currency, or in a “basket” of securities or commodities representing a particular index. Interest rate swaps involve the exchange by the Fund with another party of their respective commitments to pay or receive interest, such as an exchange of fixed rate payments for floating rate payments. Index swaps involve the exchange by the Fund with another party of the respective amounts payable with respect to a notional principal amount related to one or more indexes. Mortgage swaps are similar to interest rate swaps in that they represent commitments to pay and receive interest. The notional principal amount, however, is tied to a reference pool or pools of mortgages. Currency swaps involve the exchange of cash flows on a notional amount of two or more currencies based on their relative future values. Commodity swaps may, for example, involve the exchange of floating-rate interest payments for the total return on a commodity index.  In a total return commodity swap, the Fund will receive the price appreciation of a commodity index, a portion of the index, or a single commodity in exchange for paying an agreed-upon fee.  If the commodity swap is for one period, the Fund may pay a fixed fee, established at the outset of the swap.  However, if the term of the commodity swap is more than one period, with interim swap payments, the Fund may pay an adjustable or floating fee. With a “floating” rate, the fee may be pegged to a base rate, such as the London Interbank Offered Rate, and adjusted each period. Therefore, if interest rates increase over the term of the swap contract, the Fund may be required to pay a higher fee at each swap reset date.

Most swap agreements entered into by the Fund would calculate the obligations of the parties to the agreement on a “net” basis, which means that the two payment streams are netted out, with the Fund receiving or paying, as the case may be, only the net amount of the two payments. Consequently, the Fund’s current obligations (or rights) under a swap agreement will generally be equal only to the net amount to be paid or received under the agreement based on the relative values of the positions held by each party to the agreement. The Fund’s current obligations under a swap agreement will be accrued daily (offset against any amounts owed to the Fund) and any accrued but unpaid net amounts owed to a swap counterparty will be covered by the segregation of assets determined to be liquid by Credit Suisse in accordance with procedures established by the Board, to avoid any potential leveraging of the Fund’s portfolio. Obligations under swap agreements so covered will not be construed to be “senior securities” for purposes of the Fund’s investment restriction concerning senior securities.

Whether the Fund’s use of swap agreements will be successful in furthering its investment objective of total return will depend on Credit Suisse’s ability to predict correctly whether certain types of investments are likely to produce greater returns than other investments. Because they are two party contracts and because they may have terms of greater than seven days, swap agreements may be considered to be illiquid. Moreover, the Fund bears the risk of loss of the amount expected to be received under a swap agreement in the event of the default or bankruptcy of a swap agreement counterparty. The Fund will enter into swap agreements only with counterparties that meet certain standards of creditworthiness.  Pursuant to restrictions imposed on the Fund by the Code which limit the Fund’s ability to use swap agreements, the Fund limits its investments in commodity-linked swap agreements so that the income derived from commodity-linked swap agreements is limited to a maximum of 10% of the Fund’s gross income.

Interest rate, index and mortgage swaps do not involve the delivery of securities, other underlying assets or principal. Accordingly, the risk of loss with respect to interest rate, index and mortgage swaps is limited to the net amount of interest payments that the Fund is contractually obligated to make. If the other party to an interest rate, index or mortgage swap defaults, the Fund’s risk of loss consists of the net amount of interest payments that the Fund is contractually entitled to receive. In contrast, currency swaps usually involve the delivery of a gross payment stream in one designated currency in exchange for the gross payment stream in another designated currency. Therefore, the entire payment stream under a currency swap is subject to the risk that the other party to the swap will default on its contractual delivery obligations.

27

Credit Default Swap Agreements .  The Fund may enter into credit default swap agreements either as a buyer or a seller. The Fund may buy a credit default swap to attempt to mitigate the risk of default or credit quality deterioration in one or more individual holdings or in a segment of the fixed income securities market. The Fund may sell a credit default swap in an attempt to gain exposure to an underlying issuer’s credit quality characteristics without investing directly in that issuer.

The “buyer” in a credit default swap is obligated to pay the “seller” an upfront payment or a periodic stream of payments over the term of the agreement, provided that no credit event on an underlying reference obligation has occurred. If a credit event occurs, the seller must pay the buyer the full notional value, or “par value,” of the reference obligation in exchange for the reference obligation. As a result of counterparty risk, certain credit default swap agreements may involve greater risks than if the Fund had invested in the reference obligation directly.

If the Fund is a buyer and no credit event occurs, the cost to the Fund is the premium paid with respect to the agreement. If a credit event occurs, however, the Fund may elect to receive the full notional value of the swap in exchange for an equal face amount of deliverable obligations of the reference entity that may have little or no value. On the other hand, the value of any deliverable obligations paid by the Fund to the seller, coupled with the upfront or periodic payments previously received by the seller, may be less than the full notional value the seller pays to the Fund, resulting in a loss of value to the Fund.

If the Fund is a seller and no credit event occurs, the Fund would generally receive an upfront payment or a fixed rate of income throughout the term of the swap, which typically is between six months and three years. If a credit event occurs, however, generally the Fund would have to pay the buyer the full notional value of the swap in exchange for an equal face amount of deliverable obligations of the reference entity that may have little or no value. When the Fund acts as a seller of a credit default swap agreement it is exposed to speculative exposure risk since, if a credit event occurs, the Fund may be required to pay the buyer the full notional value of the contract net of any amounts owed by the buyer related to its delivery of deliverable obligations of the reference entity. As a result, the Fund bears the entire risk of loss due to a decline in value of a referenced security on a credit default swap it has sold if there is a credit event with respect to the security. The Fund bears the same risk as a buyer of fixed income securities directly. The Fund will sell a credit derivative only with respect to securities in which it would be authorized to invest.

Certain credit default swap agreements may not have liquidity beyond the counterparty to the agreement and may be considered illiquid. Other credit default swap agreements, however, may be considered liquid. Moreover, the Fund bears the risk of loss of the amount expected to be received under a credit default swap agreement in the event of the default or bankruptcy of the counterparty. The Fund will enter into swap agreements as a buyer only with counterparties that are deemed creditworthy by Credit Suisse. Credit default swap agreements are generally valued at a price at which the counterparty to such agreement would terminate the agreement. As the seller of a credit default swap, the Fund would be subject to investment exposure on the notional amount of the swap. Accordingly, the Fund will segregate liquid investments in an amount equal to the aggregate notional value of the of the credit default swaps of which it is the seller.

When the Fund buys or sells a credit derivative, the underlying issuer(s) or obligor(s) to the transaction will be treated as an issuer for purposes of complying with the Fund’s issuer diversification and industry concentration policies, absent regulatory guidance to the contrary. The Fund may, but is not required to, use credit swaps or any other credit derivative. There is no assurance that credit derivatives will be available at any time or, if used, that the derivatives will be used successfully.

Interest Rate Caps, Floors and Collars .  Forms of swap agreements also include interest rate caps, under which, in return for a premium, one party agrees to make payments to the other to the extent that interest rates exceed a specified rate, or “cap,” interest rate floors, under which, in return for a premium, one party agrees to make payments to the other to the extent that interest rates fall below a specified rate, or “floor,” and interest rate collars, under which a party sells a cap and purchases a floor or vice versa in an attempt to protect itself against interest rate movements exceeding given minimum or maximum levels.

The Fund may enter into interest rate caps, floors and collars for hedging purposes or to seek to increase total return (speculation). The purchase of an interest rate cap entitles the purchaser, to the extent that a specified

28

index exceeds a predetermined interest rate, to receive payment of interest on a notional principal amount from the party selling such interest rate cap. The purchase of an interest rate floor entitles the purchaser, to the extent that a specified index falls below a predetermined interest rate, to receive payments of interest on a notional principal amount from the party selling the interest rate floor. An interest rate collar is the combination of a cap and a floor that preserves a certain return within a predetermined range of interest rates.

Temporary Investments

To the extent permitted by its investment objective and policies, the Fund may hold cash or cash equivalents pending investment or to meet redemption requests. In addition, for defensive purposes due to abnormal market conditions or economic situations as determined by Credit Suisse, the Fund may reduce its holdings in other securities and invest up to 100% of its assets in cash or certain short-term (less than twelve months to maturity) and medium-term (not greater than five years to maturity) interest-bearing instruments or deposits of the U.S. and foreign issuers. The short-term and medium-term debt securities in which the Fund may invest for temporary defensive purposes consist of: (a) obligations of the United States or foreign governments, their respective agencies or instrumentalities; (b) bank deposits or bank obligations (including certificates of deposit, time deposits and bankers’ acceptances) of U.S. or foreign banks denominated in any currency; (c) floating rate securities and other instruments denominated in any currency issued by international development agencies; (d) finance company and corporate commercial paper and other short-term corporate debt obligations of U.S. and foreign corporations; and (e) repurchase agreements with banks and broker-dealers with respect to such securities.

U.S. Government Securities

The Fund may invest in obligations issued or guaranteed by the U.S. government, its agencies or instrumentalities (“Government Securities”). Direct obligations of the U.S. Treasury include a variety of securities that differ in their interest rates, maturities and dates of issuance. U.S. government securities also include securities issued or guaranteed by the Federal Housing Administration, Farmers Home Loan Administration, Export-Import Bank of the U.S., Small Business Administration, GNMA, General Services Administration, Central Bank for Cooperatives, Federal Farm Credit Banks, Federal Home Loan Banks, Freddie Mac, Federal Intermediate Credit Banks, Federal Land Banks, Fannie Mae, Maritime Administration, Tennessee Valley Authority, District of Columbia Armory Board and Student Loan Marketing Association. The Fund may invest in instruments that are supported by the right of the issuer to borrow from the U.S. Treasury and instruments that are supported solely by the credit of the instrumentality or government-sponsored enterprise. Because the U.S. Government is not obligated by law to provide support to an instrumentality it sponsors, the Fund will invest in obligations issued by such an instrumentality only if Credit Suisse determines that the credit risk with respect to the instrumentality does not make its securities unsuitable for investment by the Fund.

In September 2008, Fannie Mae and Freddie Mac were placed in conservatorship by their regulator, the Federal Housing Finance Agency. Although the U.S. government has provided financial support to Fannie Mae and Freddie Mac, there can be no assurance that it will support these or other government-sponsored enterprises in the future.

Warrants

The Fund may purchase warrants issued by domestic and foreign companies to purchase newly created equity securities consisting of common and preferred stock. The equity security underlying a warrant is outstanding at the time the warrant is issued or is issued together with the warrant.

Investing in warrants can provide a greater potential for profit or loss than an equivalent investment in the underlying security, and, thus, can be a speculative investment. The value of a warrant may decline because of a decline in the value of the underlying security, the passage of time, changes in interest rates or in the dividend or other policies of the company whose equity underlies the warrant or a change in the perception as to the future price of the underlying security, or any combination thereof. Warrants generally pay no dividends and confer no voting or other rights, except for the right to purchase the underlying security.

29

When-Issued Securities and Delayed-Delivery Transactions

The Fund may utilize its assets to purchase securities on a “when-issued” basis or purchase or sell securities for delayed delivery (i.e., payment or delivery occur beyond the normal settlement date at a stated price and yield). The Fund will enter into a when-issued transaction for the purpose of acquiring portfolio securities and not for the purpose of leverage, but may sell the securities before the settlement date if Credit Suisse deems it advantageous to do so. The payment obligation and the interest rate that will be received on when-issued securities are fixed at the time the buyer enters into the commitment. Due to fluctuations in the value of securities purchased or sold on a when-issued or delayed-delivery basis, the yields obtained on such securities may be higher or lower than the yields available in the market on the dates when the investments are actually delivered to the buyers.

When the Fund agrees to purchase when-issued or delayed-delivery securities, its custodian will set aside cash or liquid securities that are acceptable as collateral to the appropriate regulatory authority equal to the amount of the commitment in a segregated account. Normally, the custodian will set aside portfolio securities to satisfy a purchase commitment, and in such a case the Fund may be required subsequently to place additional assets in the segregated account in order to ensure that the value of the account remains equal to the amount of the Fund’s commitment. It may be expected that the Fund’s net assets will fluctuate to a greater degree when it sets aside portfolio securities to cover such purchase commitments than when it sets aside cash. When the Fund engages in when-issued or delayed-delivery transactions, it relies on the other party to consummate the trade. Failure of the seller to do so may result in the Fund incurring a loss or missing an opportunity to obtain a price considered to be advantageous.

Zero Coupon Securities

The Fund may invest without limit in “zero coupon” U.S. Treasury, foreign government and U.S. and foreign corporate convertible and nonconvertible debt securities, which are bills, notes and bonds that have been stripped of their unmatured interest coupons and custodial receipts or certificates of participation representing interests in such stripped debt obligations and coupons. A zero coupon security pays no interest to its holder prior to maturity. Accordingly, such securities usually trade at a deep discount from their face or par value and will be subject to greater fluctuations of market value in response to changing interest rates than debt obligations of comparable maturities that make current distributions of interest. Federal tax law requires that a holder of a zero coupon security accrue a portion of the discount at which the security was purchased as income each year, even though the holder receives no interest payment on the security during the year. Such accrued discount will be includible in determining the amount of dividends the Fund must pay each year and, in order to generate cash necessary to pay such dividends, the Fund may liquidate portfolio securities at a time when it would not otherwise have done so. See “Additional Information Concerning Taxes.” At present, the U.S. Treasury and certain U.S. agencies issue stripped Government Securities. In addition, a number of banks and brokerage firms have separated the principal portions from the coupon portions of U.S. Treasury bonds and notes and sold them separately in the form of receipts or certificates representing undivided interests in these instruments.

Government Zero Coupon Securities.   The Fund may invest in (i) Government Securities that have been stripped of their unmatured interest coupons, (ii) the coupons themselves and (iii) receipts or certificates representing interests in stripped Government Securities and coupons (collectively referred to as “Government zero coupon securities”).

Regulatory Aspects of Derivatives Instruments

Credit Suisse is registered as a “commodity pool operator” under the Commodity Exchange Act (“CEA”) with respect to the Fund.  Due to recent regulatory changes, the disclosures and operations of the Fund will need to comply with all applicable CFTC regulations.  Compliance with these additional regulatory requirements will increase the Fund’s regulatory compliance costs. Credit Suisse is not required to be registered as a “commodity trading advisor” with respect to its service as the investment adviser to the Fund.

Transactions in options by the Fund are subject to limitations established by each of the exchanges governing the maximum number of options that may be written or held by a single investor or group of investors acting in concert, regardless of whether the options were written or purchased on the same or different exchanges or are held in one or more accounts or through one or more exchanges or brokers. Thus, the number of options the

30

Fund may write or hold may be affected by options written or held by other entities, including other investment companies having the same or an affiliated investment adviser.

The CFTC and certain U.S. exchanges have established limits, referred to as “speculative position limits,” on the maximum net long or net short position that any person, or group of persons acting together, may hold or control in particular futures, options on futures contracts and swaps that perform a significant price discovery function, regardless of whether the contracts were written or purchased on the same or different exchanges or are held in one or more accounts or through one or more exchanges or brokers. Transactions in certain futures, options on futures, and swaps by the Fund are subject to these speculative position limits. Thus, the number of futures contracts or options on futures the Fund may write or hold may be affected by futures or options on futures written or held by other entities, including other accounts advised by Credit Suisse. An exchange may order the liquidation of positions found to be in violation of those limits and may impose certain other sanctions.

Asset Coverage for Certain Derivative Transactions

The Fund will comply with guidelines established by the SEC with respect to coverage of certain derivative transactions. These guidelines may, in certain instances, require segregation by the Fund of cash or liquid securities with its custodian or a designated sub-custodian to the extent the Fund’s obligations with respect to these strategies are not otherwise “covered” through ownership of the underlying security, financial instrument or currency or by other portfolio positions or by other means consistent with applicable regulatory policies. With respect to futures and forward contracts that are not contractually required to “cash-settle” and which the Board has not determined to treat as “cash-settled,” the Fund covers its open positions by setting aside liquid assets equal to the contracts’ full notional value. With respect to futures and forward contracts that are contractually required to “cash-settle” and those which the Fund treats as “cash-settled” pursuant to a process approved by the Board (including currency forwards that settle in currencies of G-10 countries), however, the Fund sets aside liquid assets in an amount equal to the Fund’s daily mark-to-market (net) obligation (i.e., the Fund’s daily net liability, if any), rather than the notional value. Segregated assets cannot be sold or transferred unless equivalent assets are substituted in their place or it is no longer necessary to segregate them. As a result, there is a possibility that segregation of a large percentage of the Fund’s assets could impede portfolio management or the Fund’s ability to meet redemption requests or other current obligations.

For example, a call option written by the Fund on securities may require the Fund to hold the securities subject to the call (or securities convertible into the securities without additional consideration) or to segregate assets (as described above) sufficient to purchase and deliver the securities if the call is exercised. A call option written by the Fund on an index may require the Fund to own portfolio securities that correlate with the index or to segregate assets (as described above) equal to the exercise price and any excess of the index value over the exercise price on a current basis. A put option written by the Fund may require the Fund to segregate assets (as described above) equal to the exercise price. The Fund could purchase a put option if the strike price of that option is the same or higher than the strike price of a put option sold by the Fund. If the Fund holds a futures or forward contract, the Fund could purchase a put option on the same futures or forward contract with a strike price as high or higher than the price of the contract held. The Fund may enter into fully or partially offsetting transactions so that its net position, coupled with any segregated assets (equal to any remaining obligation), equals its net obligation. Asset coverage may be achieved by other means when consistent with applicable regulatory policies.

INVESTMENT RESTRICTIONS

The following fundamental investment restrictions are applicable to the Fund and may not be changed without the affirmative vote of the holders of a majority of the Fund’s outstanding shares. Such majority is defined as the lesser of (a) 67% or more of the shares present at the meeting, if holders of more than 50% of the outstanding shares of the Fund are present or represented by proxy, or (b) more than 50% of the outstanding shares.

Except as set forth in the Prospectus and this SAI , all other investment policies or practices are considered by the Fund not to be fundamental and accordingly may be changed without shareholder approval. If a percentage restriction (other than the percentage limitation set forth in number 1) is adhered to at the time of investment, a later increase or decrease in percentage resulting from a change in values or assets will not constitute a violation of such restriction.

31

Fundamental Investment Restrictions

The Fund may not:

1. Borrow money, except to the extent permitted under the 1940 Act;

2. Invest 25% or more of the value of its total assets in any one industry or group of industries, other than the United States Government, or any of its agencies or instrumentalities;

3. Make loans except through loans of portfolio securities, entry into repurchase agreements, acquisitions of securities consistent with its investment objective and policies and as otherwise permitted by the 1940 Act;

4. Underwrite the securities of other issuers, except to the extent that in connection with the disposition of portfolio securities the Fund may be deemed to be an underwriter;

5. Purchase or sell real estate, provided that the Fund may invest in securities secured by real estate or interests therein or issued by companies that invest or deal in real estate or interests therein or are engaged in the real estate business, including real estate investment trusts;

6. Purchase or sell commodities or commodities contracts except to the extent permitted by applicable law; or

7. Issue senior securities, except as permitted under the 1940 Act.

PORTFOLIO VALUATION

The net asset value (“NAV”) of each class of the Fund is determined daily as of the close of regular trading (normally 4 p.m. eastern time) on the New York Stock Exchange, Inc. (the “NYSE”) on each day the NYSE is open for business. As of the date of this SAI , the NYSE is normally open for trading every weekday except in the event of an emergency or for the following holidays (or the days on which they are observed): New Year’s Day, Martin Luther King, Jr. Day, Presidents’ Day, Good Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving Day and Christmas Day. Please see the Prospectus for a description of the procedures used by the Fund in valuing its assets.

Trading in securities in certain foreign countries is completed at various times prior to the close of business on each business day in New York (i.e., a day on which the NYSE is open for trading). In addition, securities trading in a particular country or countries may not take place on all business days in New York. Furthermore, trading takes place in various foreign markets on days that are not business days in New York and days on which the Fund’s net asset value is not calculated. As a result, calculation of the Fund’s net asset value may not take place contemporaneously with the determination of the prices of certain foreign portfolio securities used in such calculation. All assets and liabilities initially expressed in foreign currency values will be converted into U.S. dollar values at the prevailing rate as quoted by a pricing service approved by the Board at the close of the London Stock Exchange. If such quotations are not available, the rate of exchange will be determined in good faith by or under the direction of the Board.

Transactions on U.S. stock exchanges and some foreign stock exchanges involve the payment of negotiated brokerage commissions. On exchanges on which commissions are negotiated, the cost of transactions may vary among different brokers. On most foreign exchanges, commissions are generally fixed. There is generally no stated commission in the case of securities traded in domestic or foreign over-the-counter markets, but the price of securities traded in over-the-counter markets includes an undisclosed commission or mark-up. U.S. Government securities are generally purchased from underwriters or dealers, although certain newly issued U.S. government securities may be purchased directly from the U.S. Treasury or from the issuing agency or instrumentality. No brokerage commissions are typically paid on purchases and sales of U.S. government securities.

Credit Suisse will select portfolio investments and effect transactions for the Fund. In selecting broker-dealers, Credit Suisse does business exclusively with those broker-dealers that, in its judgment, can be expected to provide the best service. The service has two main aspects: the execution of buy and sell orders and the provision of research. In negotiating commissions with broker-dealers, Credit Suisse will pay no more for execution and research services than it considers either, or both together, to be worth. The worth of execution service depends on the ability of the broker-dealer to minimize costs of securities purchased and to maximize prices obtained for securities sold. The worth of research depends on its usefulness in optimizing portfolio composition and its changes over time. Commissions for the combination of execution and research services that meet Credit Suisse’s standards may be higher than for execution services alone or for services that fall below Credit Suisse’s standards. Credit Suisse believes that these arrangements may benefit all clients and not necessarily only the accounts in which the particular investment transactions occur that are so executed. Further, Credit Suisse will receive brokerage or research services only in connection with securities transactions that are consistent with the “safe harbor” provisions of Section 28(e) of the Securities Exchange Act of 1934 (the “Exchange Act”) when paying such higher commissions. Research services may include research on specific industries or companies, macroeconomic analyses, analyses of national and international events and trends, evaluations of thinly traded securities, computerized trading screening techniques and securities ranking services, and general research services. Research received from brokers or dealers is supplemental to the Adviser’s own research program.

All orders for transactions in securities or options on behalf of the Fund are placed by Credit Suisse with broker-dealers that it selects, including Credit Suisse Securities (USA) LLC (“CSSU”), the Fund’s distributor and an affiliate of Credit Suisse, and other affiliates of Credit Suisse Group AG. The Fund may utilize CSSU or other affiliates of Credit Suisse Group AG in connection with a purchase or sale of securities when Credit Suisse believes that the charge for the transaction does not exceed usual and customary levels and when doing so is consistent with guidelines adopted by the Board.

Investment decisions for the Fund concerning specific portfolio securities are made independently from those for other clients advised by Credit Suisse. Such other investment clients may invest in the same securities as the Fund. When purchases or sales of the same security are made at substantially the same time on behalf of such other clients, transactions are averaged as to price and available investments allocated as to amount, in a manner which Credit Suisse believes to be equitable to each client, including the Fund. In some instances, this investment procedure may adversely affect the price paid or received by the Fund or the size of the position obtained or sold for the Fund. To the extent permitted by law, Credit Suisse may aggregate the securities to be sold or purchased for the Fund with those to be sold or purchased for such other investment clients in order to obtain best execution.

Transactions for the Fund may be effected on foreign securities exchanges. In transactions for securities not actively traded on a foreign securities exchange, the Fund will deal directly with the dealers who make a market in the securities involved, except in those circumstances where better prices and execution are available elsewhere. Such dealers usually are acting as principal for their own account. On occasion, securities may be purchased directly from the issuer. Such portfolio securities are generally traded on a net basis and do not normally involve brokerage commissions. Securities firms may receive brokerage commissions on certain portfolio transactions, including options, futures and options on futures transactions and the purchase and sale of underlying securities upon exercise of options.

The Fund may participate, if and when practicable, in bidding for the purchase of securities for the Fund’s portfolio directly from an issuer in order to take advantage of the lower purchase price available to members of such a group. The Fund will engage in this practice, however, only when Credit Suisse, in its sole discretion, believes such practice to be otherwise in the Fund’s interest.

33

In no instance will portfolio securities be purchased from or sold to Credit Suisse, CSSU, or any other affiliated person of such companies, except as permitted by SEC exemptive order or by applicable law. In addition, the Fund will not give preference to any institutions with which the Fund enters into distribution or shareholder servicing agreements concerning the provision of distribution services or support services.

PORTFOLIO TURNOVER

The Fund does not intend to seek profits through short-term trading, but the rate of turnover will not be a limiting factor when the Fund deems it desirable to sell or purchase securities. The Fund’s portfolio turnover rate is calculated by dividing the lesser of purchases or sales of its portfolio securities for the year by the monthly average value of the portfolio securities. In accordance with industry practice, derivative instruments and instruments with a maturity of one year or less at the time of acquisition are excluded from the calculation of the portfolio turnover rate.

It is not possible to predict the Fund’s portfolio turnover rates. High portfolio turnover rates (100% or more) may result in higher brokerage commissions, higher dealer markups or underwriting commissions as well as other transaction costs. In addition, gains realized from portfolio turnover may be taxable to shareholders.

35

* “Independent Trustees” are Trustees who are not “interested persons” of the Trust as defined in the 1940 Act.

(1) Each Trustee serves until his respective successor has been duly elected and qualified.

(2) The Credit Suisse Fund Complex consists of the Trust and its series, Credit Suisse Commodity Strategy Funds and its series, Credit Suisse Trust and its portfolio, Credit Suisse High Yield Bond Fund and Credit Suisse Asset Management Income Fund, Inc.

36

(1) Each Officer serves until his or her respective successor has been duly elected and qualified.

The Board believes that each Trustee’s experience, qualifications, attributes or skills on an individual basis and in combination with those of the other Trustees lead to the conclusion that each Trustee should serve in such capacity. Among the attributes common to all Trustees are their ability to review critically, evaluate, question and discuss information provided to them, to interact effectively with the other Trustees, Credit Suisse, other service providers, counsel and the independent registered public accounting firm, and to exercise effective business judgment in the performance of their duties as Trustees. A Trustee’s ability to perform his duties effectively may have been attained through the Trustee’s business, consulting, public service and/or academic positions; experience from service as a board member of the Fund and the other funds in the Credit Suisse Fund Complex, other investment funds, public companies, or non-profit entities or other organizations; educational background or professional training; and/or other life experiences. In addition to these shared characteristics, set forth below is a brief discussion of the specific experience, qualifications, attributes or skills of each Trustee that support the conclusion that each person should serve as a Trustee.

Enrique R. Arzac. Mr. Arzac has been a Trustee since 2005, and Chairman of the Audit Committee since 2005, of all of the open-end Credit Suisse Funds in the Fund Complex. In addition, he has over 40 years of business and consulting experience in the areas of finance, trade and economics and academic experience as a professor of finance and economics. Mr. Arzac also currently serves on the boards of directors of other registered investment companies, including closed-end funds in the Fund Complex, and on the board of directors of an investment management and investment advisory services company.

Jeffrey E. Garten. Mr. Garten has been a Trustee since 1998 (except for part of 2000) of all of the open-end Credit Suisse Funds in the Fund Complex. In addition, he has over 40 years of executive, business and academic experience in the areas of international trade and finance and business management.

Steven N. Rappaport. Mr. Rappaport has been a Trustee since 1999, Chairman of the Board of Trustees since 2005, and Chairman of the Nominating Committee since 2005, of all of the open-end Credit Suisse Funds in the Fund Complex. In addition, he has over 30 years of business experience in the financial services industry. Mr. Rappaport also serves on the boards of directors of other registered investment companies, including closed-end funds in the Fund Complex.

Specific details regarding each Trustee’s principal occupations during the past five years are included in the table above.

37