INVESTMENT POLICIES AND TECHNIQUES

The following information supplements the discussion of the Portfolio’s investment objectives, principal investment strategies, policies and techniques that appears in the Prospectus for the Portfolio. Additional information concerning principal investment strategies of the Portfolio, and other investment strategies that may be used by the Portfolio, is set forth below in alphabetical order. Additional information concerning the Portfolio’s investment restrictions is set forth above under “Investment Restrictions.”

If a percentage limitation on investments by the Portfolio stated in this SAI or the Prospectus is adhered to at the time of an investment, a later increase or decrease in percentage resulting from changes in asset value will not be deemed to violate the limitation except in the case of the limitations on borrowing.

References in this section to the Adviser also apply, to the extent applicable, to the Sub-Adviser of the Portfolio.

Asset Coverage Requirements

To the extent required by SEC guidelines, the Portfolio will only engage in transactions that expose it to an obligation to another party if it owns either (a) an offsetting position for the same type of financial asset or (b) cash or liquid securities, designated on the Portfolio’s books or held in a segregated account, with a value sufficient at all times to cover its potential obligations not covered as provided in (a). Examples of transactions governed by these asset coverage requirements include, for example, futures contracts and options on futures contracts, swaps and when-issued and delayed delivery transactions. Assets used as offsetting positions, designated on the Portfolio’s books, or held in a segregated account cannot be sold while the positions requiring cover are open unless replaced with other appropriate assets. As a result, the commitment of a large portion of assets to be used as

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offsetting positions or to be designated or segregated in such a manner could impede portfolio management or the ability to meet redemption requests or other current obligations.

In the case of futures contracts that are not contractually required to cash settle, the Portfolio must set aside liquid assets equal to such contracts’ full notional value (generally, the total numerical value of the asset underlying a future or forward contract at the time of valuation) while the positions are open. With respect to futures contracts that are contractually required to cash settle, however, the Portfolio is permitted to set aside liquid assets in an amount equal to the Portfolio’s daily mark-to-market net obligation (i.e., the Portfolio’s daily net liability) under the contracts, if any, rather than such contracts’ full notional value. By setting aside assets equal to only its net obligations under cash-settled futures, the Portfolio may employ leverage to a greater extent than if the Portfolio were required to segregate assets equal to the full notional value of such contracts.

Borrowing

The Portfolio, along with certain other funds managed by the Adviser ( “Participating Funds” ), is a party to a 364-day, $2.53 billion credit agreement with a group of lenders (the “Credit Agreement” ), which expires in July 2016, unless extended or renewed. The Portfolio may borrow under the Credit Agreement to meet shareholder redemptions and for other lawful purposes. Borrowing results in interest expense and other fees and expenses, which may increase the Portfolio’s net expenses and reduce the Portfolio’s return. Participating Funds have been allocated different portions of the committed amount of the Credit Facility based primarily on the expected likelihood and extent of the need to borrow under the Credit Agreement. Administration, arrangement and commitment fees under the Credit Agreement are allocated among Participating Funds based upon portions of the aggregate commitment available to them and other factors deemed relevant by the Adviser and the Board of each Participating Fund.

Derivatives

Subject to the limitations set forth below under “Limitations on the Use of CFTC-Regulated Futures, Options on Futures and Swaps,” the Portfolio may use derivative instruments as described below. Generally, a derivative is a financial contract the value of which depends upon, or is derived from, the value of an underlying asset, reference rate or index. Derivatives generally take the form of contracts under which the parties agree to payments between them based upon the performance of a wide variety of underlying references, such as stocks, bonds, loans, commodities, interest rates, currency exchange rates, and various domestic and foreign indices.

The Portfolio may use derivatives for a variety of reasons, including as a substitute for investing directly in securities, as part of a hedging strategy (that is, for the purpose of reducing risk to the Portfolio), to manage the effective duration of the Portfolio’s portfolio, or for other purposes related to the management of the Portfolio. Derivatives permit the Portfolio to increase or decrease the level of risk, or change the character of the risk, to which its portfolio is exposed in much the same way as the Portfolio can increase or decrease the level of risk, or change the character of the risk, of its portfolio by making investments in specific securities. However, derivatives may entail investment exposures that are greater than their cost would suggest. As a result, a small investment in derivatives could have a large impact on the Portfolio’s performance.

While transactions in some derivatives may be effected on established exchanges, many other derivatives are privately negotiated and entered into in the over-the-counter ( “OTC” ) market with a single counterparty. When exchange-traded derivatives are purchased and sold, a clearing agency associated with the exchange stands between each buyer and seller and effectively guarantees performance of each contract, either on a limited basis through a guaranty fund or to the full extent of the clearing agency’s balance sheet. Transactions in OTC derivatives not subject to a clearing requirement have no such protection. Each party to an uncleared OTC derivative bears the risk that its direct counterparty will default. In addition, OTC derivatives are generally less liquid than exchange-traded derivatives because they often can only be closed out with the other party to the transaction.

The use of derivative instruments is subject to applicable regulations of the SEC, the CFTC, various state regulatory authorities and, with respect to exchange-traded derivatives, the several exchanges upon which they are traded. As discussed above under “Asset Coverage Requirements,”

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in order to engage in certain transactions in derivatives, the Portfolio may be required to hold offsetting positions or to hold cash or liquid securities in a segregated account or designated on the Portfolio’s books. In addition, the Portfolio’s ability to use derivative instruments may be limited by tax considerations.

The particular derivative instruments the Portfolio can use are described below. The Portfolio’s portfolio manager may decide not to employ some or all of these instruments, and there is no assurance that any derivatives strategy used by the Portfolio will succeed. The Portfolio may employ new derivative instruments and strategies when they are developed, if those investment methods are consistent with the Portfolio’s investment objectives and are permissible under applicable regulations governing the Portfolio.

Futures

The Portfolio may engage in futures transactions. The Portfolio may buy and sell futures contracts that relate to (1) interest rates, (2) debt securities and (3) bond indices. The Portfolio may only enter into futures contracts which are standardized and traded on a U.S. or foreign exchange, board of trade or similar entity, or quoted on an automated quotation system.

A futures contract is an agreement between two parties to buy and sell a security, index or interest rate (each a “financial instrument” ) for a set price on a future date. Certain futures contracts, such as futures contracts relating to individual securities, call for making or taking delivery of the underlying financial instrument. However, these contracts generally are closed out before delivery by entering into an offsetting purchase or sale of a matching futures contract. Other futures contracts, such as futures contracts on interest rates and indices, do not call for making or taking delivery of the underlying financial instrument, but rather are agreements pursuant to which two parties agree to take or make delivery of an amount of cash equal to the difference between the value of the financial instrument at the close of the last trading day of the contract and the price at which the contract was originally written. These contracts also may be settled by entering into an offsetting futures contract.

Unlike when the Portfolio purchases or sells a security, no price is paid or received by the Portfolio upon the purchase or sale of a futures contract. Initially, the Portfolio will be required to deposit with its futures broker (also known as a futures commission merchant ( “FCM” )) an amount of cash or securities equal to a specified percentage of the contract amount. This amount is known as initial margin. The margin deposit is intended to ensure completion of the contract. Minimum initial margin requirements are established by the futures exchanges and may be revised. In addition, FCMs may establish margin deposit requirements that are higher than the exchange minimums. Cash held as margin is generally invested by the FCM in high-quality instruments permitted under CFTC regulations, with returns retained by the FCM and interest paid to the Portfolio on the cash at an agreed-upon rate. The Portfolio will also receive any interest paid from coupon-bearing securities, such as Treasury securities, held in margin accounts. Subsequent payments to and from the FCM, called variation margin, will be made on a daily basis as the price of the underlying financial instrument fluctuates, making the futures contract more or less valuable, a process known as marking the contract to market. Changes in variation margin are recorded by the Portfolio as unrealized gains or losses. At any time prior to expiration of the futures contract, the Portfolio may elect to close the position by taking an opposite position that will operate to terminate its position in the futures contract. A final determination of variation margin is then made, additional cash is required to be paid by or released to the Portfolio, and the Portfolio realizes a gain or loss. In the event of the bankruptcy or insolvency of an FCM that holds margin on behalf of the Portfolio, the Portfolio may be entitled to the return of margin owed to it only in proportion to the amount received by the FCM’s other customers, potentially resulting in losses to the Portfolio. Futures transactions also involve brokerage costs.

Most U.S. futures exchanges limit the amount of fluctuation permitted in futures contract prices during a single trading day. The daily limit establishes the maximum amount that the price of a futures contract may vary either up or down from the previous day’s settlement price at the end of a trading session. Once the daily limit has been reached in a particular type of futures contract, no trades may be made on that day at a price beyond that limit. The daily limit governs only price movement during a particular trading day and therefore does not limit potential losses, because the limit may prevent the liquidation of unfavorable positions. Futures contract prices have occasionally moved to the daily

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limit for several consecutive trading days with little or no trading, thereby preventing prompt liquidation of futures positions and subjecting some futures traders to substantial losses.

Options on Futures

The Portfolio may also purchase or write put and call options on futures contracts and write straddles, which consist of a call and put option on the same futures contract. A futures option gives the holder the right, in return for the premium paid, to assume a long position (call) or short position (put) in a futures contract at a specified exercise price prior to the expiration of the option. Upon exercise of a call option, the holder acquires a long position in the futures contract and the writer is assigned the opposite short position. In the case of a put option, the opposite is true. Prior to exercise or expiration, a futures option may be closed out by an offsetting purchase or sale of a futures option of the same series.

The Portfolio may use options on futures contracts in connection with hedging strategies. The writing of a call option or the purchasing of a put option on a futures contract constitutes a partial hedge against declining prices of the securities which are deliverable upon exercise of the futures contract. If the futures price at expiration of a written call option is below the exercise price, the Portfolio will retain the full amount of the option premium which provides a partial hedge against any decline that may have occurred in the Portfolio’s holdings of securities. If the futures price when the option is exercised is above the exercise price, however, the Portfolio will incur a loss, which may be offset, in whole or in part, by the increase in the value of the securities held by the Portfolio that were being hedged. Writing a put option or purchasing a call option on a futures contract serves as a partial hedge against an increase in the value of the securities the Portfolio intends to acquire.

When writing a call option, the Portfolio must either segregate liquid assets with a value equal to the fluctuating market value of the optioned futures contract, or the Portfolio must own an option to purchase the same futures contract having an exercise price that is (i) equal to or less than the exercise price of the call written, or (ii) greater than the exercise price of the call written, provided the difference is maintained by the Portfolio in segregated liquid assets.

When writing a put option, the Portfolio must segregate liquid assets in an amount not less than the exercise price, or own a put option on the same futures contract where the exercise price of the put held is (i) equal to or greater than the exercise price of the put written, or (ii) less than the exercise price of the put written, provided the difference is maintained by the Portfolio in segregated liquid assets.

When the Portfolio writes a straddle, sufficient assets will be segregated to meet the Portfolio’s immediately obligations. The Portfolio may segregate the same liquid assets for both the call and put options in a straddle where the exercise price of the call and put are the same, or the exercise price of the call is higher than that of the put. In such cases, the Portfolio will also segregate liquid assets equivalent to the amount, if any, by which the put is “in the money.”

As with investments in futures contracts, the Portfolio is required to deposit and maintain margin with respect to put and call options on futures contracts written by it.

Swap Transactions

The Portfolio may enter into interest rate, total return and credit default swap agreements, along with other swap agreements for any purpose consistent with the Portfolio’s investment objective. The Portfolio may also enter into options on the foregoing types of swap agreements ( “swap options” ).

The Portfolio may enter into swap transactions for any purpose consistent with its investment objectives and strategies, 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 purchases and/or sales of instruments in other markets, as a duration management technique, to protect against an increase in the price of securities the Portfolio anticipates purchasing at a later date, to reduce risk arising from the ownership of a particular instrument, or to gain exposure to certain securities, reference rates, sectors or markets.

Swap agreements are two party contracts entered into primarily by institutional investors for a specified period of time. In a standard swap transaction, two parties agree to exchange the returns (or

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differentials in rates of return) earned or realized on a particular predetermined asset, reference rate or index. The gross returns to be exchanged or swapped between the parties are generally calculated with respect to a notional amount, e.g., the return on or increase in value of a particular dollar amount invested at a particular interest rate or in a basket of securities representing a particular index. The notional amount of the swap agreement generally is only used as a basis upon which to calculate the obligations that the parties to the swap agreement have agreed to exchange. The Portfolio’s current obligations under a net swap agreement will be accrued daily (offset against any amounts owed to the Portfolio) and the Portfolio will segregate assets determined to be liquid by the Sub-Adviser for any accrued but unpaid net amounts owed to a swap counterparty. See “Asset Coverage Requirements” above.

Interest Rate Swaps. Interest rate swaps are financial instruments that involve the exchange of one type of interest rate for another type of interest rate cash flow on specified dates in the future. Some of the different types of interest rate swaps are “fixed-for-floating rate swaps,” “termed basis swaps” and “index amortizing swaps.” Fixed-for-floating rate swaps involve the exchange of fixed interest rate cash flows for floating rate cash flows. Termed basis swaps entail cash flows to both parties based on floating interest rates, where the interest rate indices are different. Index amortizing swaps are typically fixed-for-floating swaps where the notional amount changes if certain conditions are met. Like a traditional investment in a debt security, the Portfolio could lose money by investing in an interest rate swap if interest rates change adversely.

Total Return Swaps. In a total return swap, one party agrees to pay the other the “total return” of a defined underlying asset during a specified period, in return for periodic payments based on a fixed or variable interest rate or the total return from other underlying assets. A total return swap may be applied to any underlying asset but is most commonly used with equity indices, single stocks, bonds and defined baskets of loans and mortgages. The Portfolio might enter into a total return swap involving an underlying index or basket of securities to create exposure to a potentially widely-diversified range of securities in a single trade. An index total return swap can be used by the portfolio managers to assume risk, without the complications of buying the component securities from what may not always be the most liquid of markets.

Credit Default Swaps. A credit default swap is a bilateral contract that enables an investor to buy or sell protection against a defined-issuer credit event. The Portfolio may enter into credit default swap agreements either as a buyer or a seller. The Portfolio may buy protection to attempt to mitigate the risk of default or credit quality deterioration in one or more of its individual holdings or in a segment of the fixed income securities market to which it has exposure, or to take a “short” position in individual bonds or market segments which it does not own. The Portfolio may sell protection in an attempt to gain exposure to the credit quality characteristics of particular bonds or market segments without investing directly in those bonds or market segments.

As the buyer of protection in a credit default swap, the Portfolio will pay a premium (by means of an upfront payment or a periodic stream of payments over the term of the agreement) in return for the right to deliver a referenced bond or group of bonds to the protection seller and receive the full notional or par value (or other agreed upon value) upon a default (or similar event) by the issuer(s) of the underlying referenced obligation(s). If no default occurs, the protection seller would keep the stream of payments and would have no further obligation to the Portfolio. Thus, the cost to the Portfolio would be the premium paid with respect to the agreement. If a credit event occurs, however, the Portfolio 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. The Portfolio bears the risk that the protection seller may fail to satisfy its payment obligations.

If the Portfolio is a seller of protection in a credit default swap and no credit event occurs, the Portfolio would generally receive an up-front payment or a periodic stream of payments over the term of the swap. If a credit event occurs, however, generally the Portfolio 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. As the protection seller, the Portfolio effectively adds economic leverage to its portfolio because, in addition to being subject to investment exposure on its total net assets, the Portfolio is subject to investment exposure on the notional amount of the swap. Thus, the Portfolio bears the same risk as it would by buying the reference obligations directly, plus

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the additional risks related to obtaining investment exposure through a derivative instrument discussed below under “Risks Associated with Swap Transactions.”

Swap Options. A swap option is a contract that gives a counterparty the right (but not the obligation), in return for payment of a premium, to enter into a new swap agreement or to shorten, extend, cancel, or otherwise modify an existing swap agreement at some designated future time on specified terms. A cash-settled option on a swap gives the purchaser the right, in return for the premium paid, to receive an amount of cash equal to the value of the underlying swap as of the exercise date. The Portfolio may write (sell) and purchase put and call swap options. Depending on the terms of the particular option agreement, the Portfolio generally will incur a greater degree of risk when it writes a swap option than when it purchases a swap option. When the Portfolio purchases a swap option, it risks losing only the amount of the premium it has paid should it decide to let the option expire unexercised. However, when the Portfolio writes a swap option, upon exercise of the option the Portfolio will become obligated according to the terms of the underlying agreement.

Risks Associated with Swap Transactions. The use of swap transactions is a highly specialized activity which involves strategies and risks different from those associated with ordinary portfolio security transactions. If the Sub-Adviser is incorrect in its forecasts of default risks, market spreads or other applicable factors the investment performance of the Portfolio would diminish compared with what it would have been if these techniques were not used. As the protection seller in a credit default swap, the Portfolio effectively adds economic leverage to its portfolio because, in addition to being subject to investment exposure on its total net assets, the Portfolio is subject to investment exposure on the notional amount of the swap. The Portfolio may only close out a swap or other two-party contract with its particular counterparty, and may only transfer a position with the consent of that counterparty. In addition, the price at which the Portfolio may close out such a two party contract may not correlate with the price change in the underlying reference asset. If the counterparty defaults, the Portfolio will have contractual remedies, but there can be no assurance that the counterparty will be able to meet its contractual obligations or that the Portfolio will succeed in enforcing its rights. It also is possible that developments in the derivatives market, including potential government regulation, could adversely affect the Portfolio’s ability to terminate existing swap or other agreements or to realize amounts to be received under such agreements.

Caps, Collars and Floors

Caps and floors have an effect similar to buying or writing options. In a typical cap or floor agreement, one party agrees to make payments only under specified circumstances, usually in return for payment of a fee by the other party. For example, the buyer of an interest rate cap obtains the right to receive payments to the extent that a specified interest rate exceeds an agreed-upon level. The seller of an interest rate floor is obligated to make payments to the extent that a specified interest rate falls below an agreed-upon level. An interest rate collar involves selling a cap and purchasing a floor or vice versa to protect the Portfolio against interest rate movements exceeding given minimum or maximum levels.

Limitations on the Use of CFTC-Regulated Futures, Options on Futures and Swaps

The Portfolio will limit its direct investments in CFTC-regulated futures, options on futures and swaps ( “CFTC Derivatives” ) to the extent necessary for the Adviser to claim the exclusion from regulation as a commodity pool operator with respect to the Portfolio under CFTC Rule 4.5, as such rule may be amended from time to time. Under Rule 4.5 as currently in effect, the Portfolio will limit its trading activity in CFTC Derivatives (excluding activity for “bona fide hedging purposes,” as defined by the CFTC) such that it meets one of the following tests:

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With respect to the Portfolio, the Adviser has filed a notice of eligibility for exclusion from the definition of the term commodity pool operator under the Commodity Exchange Act and therefore is not subject to registration or regulation as a commodity pool operator thereunder.

The requirements for qualification as a regulated investment company may also limit the extent to which the Portfolio may invest in CFTC Derivatives. See “Tax Matters—Qualification as a Regulated Investment Company.”

Federal Income Tax Treatment of Futures Contracts and Options

The Portfolio’s transactions in futures contracts and options will be subject to special provisions of the Internal Revenue Code of 1986, as amended (the “Code” ), that, among other things, may affect the character of gains and losses realized by the Portfolio (i.e., may affect whether gains or losses are ordinary or capital, or short-term or long-term), may accelerate recognition of income to the Portfolio and may defer Portfolio losses. These rules could, therefore, affect the character, amount and timing of distributions to shareholders. These provisions also (a) will require the Portfolio to mark-to-market certain types of the positions in its portfolio (i.e., treat them as if they were closed out) and (b) may cause the Portfolio to recognize income without receiving cash with which to make distributions in amounts necessary to satisfy the 90% distribution requirement for qualifying to be taxed as a regulated investment company and the distribution requirement for avoiding excise taxes.

Risks and Special Considerations Concerning Derivatives

The use of derivative instruments involves certain general risks and considerations as described below.

(1) Market Risk. Market risk is the risk that the value of the underlying assets may go up or down. Adverse movements in the value of an underlying asset can expose the Portfolio to losses. The successful use of derivative instruments depends upon a variety of factors, particularly the portfolio manager’s ability to predict movements in the relevant markets, which may require different skills than predicting changes in the prices of individual securities. There can be no assurance that any particular strategy adopted will succeed.

(2) Counterparty Risk. Counterparty risk is the risk that a loss may be sustained as a result of the failure of a counterparty to comply with the terms of a derivative instrument. The counterparty risk for exchange-traded derivatives is generally less than for OTC derivatives, since generally a clearing agency, which is the issuer or counterparty to each exchange-traded instrument, provides a guarantee of performance. For many OTC instruments, there is no similar clearing agency guarantee. In all transactions, the Portfolio will bear the risk that the counterparty will default, and this could result in a loss of the expected benefit of the derivative transactions and possibly other losses to the Portfolio. The Portfolio will enter into derivatives transactions only with counterparties that its portfolio manager reasonably believes are capable of performing under the contract.

(3) Correlation Risk. Correlation risk is the risk that there might be an imperfect correlation, or even no correlation, between price movements of a derivative instrument and price movements of investments being hedged. When a derivative transaction is used to completely hedge another position, changes in the market value of the combined position (the derivative instrument plus the position being hedged) result from an imperfect correlation between the price movements of the two instruments. With a perfect hedge, the value of the combined position remains unchanged with any change in the price of the underlying asset. With an imperfect hedge, the value of the derivative instrument and its hedge are not perfectly correlated. For example, if the value of a derivative instrument used in a short hedge (such as writing a call option, buying a put option or selling a futures contract) increased by less than the decline in value of the hedged investments, the hedge would not be perfectly correlated. This might occur due to factors unrelated to the value of the investments being hedged, such as speculative or other pressures on the markets in which these instruments are traded. The effectiveness of hedges using instruments on indices will depend, in part, on the degree of correlation between price movements in the index and the price movements in the investments being hedged.

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(4) Liquidity Risk. Liquidity risk is the risk that a derivative instrument cannot be sold, closed out or replaced quickly at or very close to its fundamental value. Generally, exchange contracts are very liquid because the exchange clearinghouse is the counterparty of every contract. OTC transactions are less liquid than exchange-traded derivatives since they often can only be closed out with the other party to the transaction. The Portfolio might be required by applicable regulatory requirements to maintain assets as “cover,” maintain segregated accounts, and/or make margin payments when it takes positions in derivative instruments involving obligations to third parties (i.e., instruments other than purchase options). If the Portfolio is unable to close out its positions in such instruments, it might be required to continue to maintain such assets or accounts or make such payments until the position expires, matures or is closed out. These requirements might impair the Portfolio’s ability to sell a security or make an investment at a time when it would otherwise be favorable to do so, or require that the Portfolio sell a portfolio security at a disadvantageous time. The Portfolio’s ability to sell or close out a position in an instrument prior to expiration or maturity depends upon the existence of a liquid secondary market or, in the absence of such a market, the ability and willingness of the counterparty to enter into a transaction closing out the position. There is no assurance that any derivatives position can be sold or closed out at a time and price that is favorable to the Portfolio.

(5) Legal Risk. Legal risk is the risk of loss caused by the unenforceability of a party’s obligations under the derivative. While a party seeking price certainty agrees to surrender the potential upside in exchange for downside protection, the party taking the risk is looking for a positive payoff. Despite this voluntary assumption of risk, a counterparty that has lost money in a derivative transaction may try to avoid payment by exploiting various legal uncertainties about certain derivative products.

(6) Systemic or “Interconnection” Risk. Systemic or interconnection risk is the risk that a disruption in the financial markets will cause difficulties for all market participants. In other words, a disruption in one market will spill over into other markets, perhaps creating a chain reaction. Much of the OTC derivatives market takes place among the OTC dealers themselves, thus creating a large interconnected web of financial obligations. This interconnectedness raises the possibility that a default by one large dealer could create losses for other dealers and destabilize the entire market for OTC derivative instruments.

(7) Leverage Risk. Leverage risk is the risk that the Portfolio may be more volatile than if it had not been leveraged due to leverage’s tendency to exaggerate the effect of any increase or decrease in the value of the Portfolio’s portfolio securities. The use of leverage may also cause the Portfolio to liquidate portfolio positions when it may not be advantageous to do so to satisfy its obligations or to meet segregation requirements.

(8) Regulatory Risk. The Dodd-Frank Act Wall Street Reform and Consumer Protection Act (the “Dodd-Frank Act”) has initiated a dramatic revision of the U.S. financial regulatory framework and covers a broad range of topics, including (among many others) a reorganization of federal financial regulators; a process intended to improve financial systemic stability and the resolution of potentially insolvent financial firms; and new rules for derivatives trading. Instruments in which the Portfolio may invest, or the issuers of such instruments, may be affected by the new legislation and regulation in ways that are unforeseeable. Many of the implementing regulations have not yet been finalized. Accordingly, the ultimate impact of the Dodd-Frank Act, including on the derivative instruments in which the Portfolio may invest, is not yet certain.

Illiquid Securities

The Portfolio may invest in illiquid securities ( i.e. , securities that are not readily marketable). For purposes of this restriction, illiquid securities include, but are not limited to, restricted securities (securities the disposition of which is restricted under the federal securities laws) and repurchase agreements with maturities in excess of seven days. However, the Portfolio will not acquire illiquid securities if, as a result, such securities would comprise more than 15% of the value of the Portfolio’s net assets. The Board of Trustees or its delegate has the ultimate authority to determine, to the extent permissible under the federal securities laws, which securities are liquid or illiquid for purposes of this 15% limitation. The Board of Trustees has delegated to the Adviser the day-to-day determination of

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the illiquidity of any portfolio security, although it has retained oversight over and ultimate responsibility for such determinations. The Adviser works with and to a large extent relies on the expertise and advice of the Sub-Adviser in making these liquidity determinations. Although no definitive liquidity criteria are used, the Board of Trustees has directed the Adviser to look to such factors as (i) the nature of the market for a security (including the institutional private resale market; the frequency of trades and quotes for the security; the number of dealers willing to purchase or sell the security; and the amount of time normally needed to dispose of the security, the method of soliciting offers and the mechanics of transfer), (ii) the terms of certain securities or other instruments allowing for the disposition to a third party or the issuer thereof ( e.g. , certain repurchase obligations and demand instruments), and (iii) other permissible relevant facts.

Restricted securities may be sold only in privately negotiated transactions or in a public offering with respect to which a registration statement is in effect under the Securities Act of 1933, as amended. Where registration is required, the Portfolio may be obligated to pay all or part of the registration expenses and a considerable period may elapse between the time of the decision to sell and the time the Portfolio may be permitted to sell a security under an effective registration statement. If, during such a period, adverse market conditions were to develop, the Portfolio might obtain a less favorable price than that which prevailed when it decided to sell. Illiquid securities will be priced at fair value as determined in good faith by the Board of Trustees or its delegate.

Mortgage-Backed Securities

The Portfolio may invest in fixed-income obligations backed by a pool of mortgages. Mortgage-backed securities are issued both by U.S. government agencies, including the Government National Mortgage Association (GNMA) the Federal National Mortgage Association (FNMA) and the Federal Home Loan Mortgage Corporation (FHLMC) and by private entities. The payment of interest and principal on securities issued by U.S. government agencies is guaranteed by the full faith and credit of the U.S. government (in the case of GNMA securities) or the issuer (in the case of FNMA and FHLMC securities). However, the guarantees do not apply to the market prices and yields of these securities, which vary with changes in interest rates. Mortgage-backed securities issued by private entities are structured similarly to mortgage-backed securities issued by GNMA, FNMA and FHLMC. These securities and the underlying mortgages are not guaranteed by government agencies. However, these securities generally are structured with one or more types of credit enhancement by a third party. Mortgage-backed securities permit borrowers to prepay their underlying mortgages. Prepayments by borrowers on underlying obligations can alter the effective maturity of these instruments.

Municipal Bonds and Other Municipal Obligations

The Portfolio invests principally in municipal bonds and other municipal obligations. These bonds and other obligations are issued by the states and by their local and special-purpose political subdivisions. The term “municipal bond” includes short-term municipal notes issued by the states and their political subdivisions, including, but not limited to, tax anticipation notes (“ TANs ”), bond anticipation notes (“ BANs ”), revenue anticipation notes ( “RANs” ), construction loan notes, tax free commercial paper, and tax free participation certificates. In general, municipal obligations include debt obligations issued by states, cities and local authorities to obtain funds for various public purposes, including construction of a wide range of public facilities such as airports, bridges, highways, hospitals, housing, mass transportation, schools, streets and water and sewer works. Industrial development bonds and pollution control bonds that are issued by or on behalf of public authorities to finance various privately-rated facilities are included within the term municipal obligations if the interest paid thereon is exempt from federal income tax.

Obligations of issuers of municipal obligations are subject to the provisions of bankruptcy, insolvency and other laws affecting the rights and remedies of creditors. In addition, the obligations of such issuers may become subject to the laws enacted in the future by Congress, state legislatures or referenda extending the time for payment of principal and/or interest, or imposing other constraints upon enforcement of such obligations or upon municipalities to levy taxes. There is also the possibility that, as a result of legislation or other conditions, the power or ability of any issuer to pay, when due, the principal of and interest on its municipal obligations may be materially affected.

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Municipal Bonds

The two general classifications of municipal bonds are “general obligation” bonds and “revenue” bonds. General obligation bonds are secured by the governmental issuer’s pledge of its faith, credit and taxing power for the payment of principal and interest upon a default by the issuer of its principal and interest payment obligations. They are usually paid from general revenues of the issuing governmental entity. Revenue bonds, on the other hand, are usually payable only out of a specific revenue source rather than from general revenues. Revenue bonds ordinarily are not backed by the faith, credit or general taxing power of the issuing governmental entity. The principal and interest on revenue bonds for private facilities are typically paid out of rents or other specified payments made to the issuing governmental entity by a private company which uses or operates the facilities. Examples of these types of obligations are industrial revenue bond and pollution control revenue bonds. Industrial revenue bonds are issued by governmental entities to provide financing aid to community facilities such as hospitals, hotels, business or residential complexes, convention halls and sport complexes. Pollution control revenue bonds are issued to finance air, water and solids pollution control systems for privately operated industrial or commercial facilities.

Revenue bonds for private facilities usually do not represent a pledge of the credit, general revenues or taxing powers of issuing governmental entity. Instead, the private company operating the facility is the sole source of payment of the obligation. Sometimes, the funds for payment of revenue bonds come solely from revenue generated by operation of the facility. Federal income tax laws place substantial limitations on industrial revenue bonds, and particularly certain specified private activity bonds issued after August 7, 1986. In the future, legislation could be introduced in Congress which could further restrict or eliminate the income tax exemption for interest on debt obligations in which the Portfolio may invest.

Refunded Bonds

The Portfolio may invest in refunded bonds. Refunded bonds may have originally been issued as general obligation or revenue bonds, but become refunded when they are secured by an escrow fund, usually consisting entirely of direct U.S. government obligations and/or U.S. government agency obligations sufficient for paying the bondholders. There are two types of refunded bonds: pre-refunded bonds and escrowed-to-maturity ( “ETM” ) bonds. The escrow fund for a pre-refunded municipal bond may be structured so that the refunded bonds are to be called at the first possible date or a subsequent call date established in the original bond debenture. The call price usually includes a premium from 1% to 3% above par. This type of structure usually is used for those refundings that either reduce the issuer’s interest payment expenses or change the debt maturity schedule. In escrow funds for ETM refunded municipal bonds, the maturity schedules of the securities in the escrow funds match the regular debt-service requirements on the bonds as originally stated in the bond indentures.

Municipal Leases and Certificates of Participation

The Portfolio also may purchase municipal lease obligations, primarily through certificates of participation. Certificates of participation in municipal leases are undivided interests in a lease, installment purchase contract or conditional sale contract entered into by a state or local governmental unit to acquire equipment or facilities. Municipal leases frequently have special risks which generally are not associated with general obligation bonds or revenue bonds. Municipal leases and installment purchase or conditional sales contracts (which usually provide for title to the leased asset to pass to the governmental issuer upon payment of all amounts due under the contract) have evolved as a means for governmental issuers to acquire property and equipment without meeting the constitutional and statutory requirements for the issuance of municipal debt.

Although lease obligations do not constitute general obligations of the municipality for which the municipality’s taxing power is pledged, a lease obligation is ordinarily backed by the municipality’s covenant to budget for, appropriate and make the payments due under the lease obligation. However, certain lease obligations contain “non-appropriation” clauses, which provide that the municipality has no obligation to make lease or installment purchase payments in future years unless money is appropriated for such purpose on a yearly basis. In evaluating securities for purchase, the Portfolio will take into account the incentive of the issuer to appropriate under the lease, among other

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factors. Some lease obligations may be illiquid under certain circumstances. Although non-appropriation lease obligations are secured by the leased equipment or facilities, disposition of the property in the event of foreclosure might prove difficult and time consuming. In addition, disposition upon non-appropriation or foreclosure might not result in recovery by the Portfolio of the full principal amount represented by an obligation.

In light of these concerns, the Portfolio has adopted and follows procedures for determining whether any municipal lease obligations purchased by the Portfolio are liquid and for monitoring the liquidity of municipal lease securities held in the Portfolio’s portfolio. These procedures require that a number of factors be used in evaluating the liquidity of a municipal lease security, including the frequency of trades and quotes for the security, the number of dealers willing to purchase or sell the security and the number of other potential purchasers, the willingness of dealers to undertake to make a market in security, the nature of the marketplace in which the security trades, and other factors which the Adviser may deem relevant. As set forth in “Investment Restrictions” above, the Portfolio is subject to limitations on the percentage of illiquid securities it can hold.

Derivative Municipal Securities

The Portfolio may also acquire derivative municipal securities, which are custodial receipts of certificates underwritten by securities dealers or banks that evidence ownership of future interest payments, principal payments or both on certain municipal securities. The underwriter of these certificates or receipts typically purchases municipal securities and deposits them in an irrevocable trust or custodial account with a custodian bank, which then issues receipts or certificates that evidence ownership of the periodic unmatured coupon payments and the final principal payment on the obligation.

The principal and interest payments on the municipal securities underlying custodial receipts may be allocated in a number of ways. For example, payments may be allocated such that certain custodial receipts may have variable or floating interest rates and others may be stripped securities which pay only the principal or interest due on the underlying municipal securities. The Portfolio may invest in custodial receipts which have inverse floating interest rates and other inverse floating rate municipal obligations, as described below under “Inverse Floating Rate Municipal Securities.”

Variable Rate Demand Notes (“VRDNs”)

VRDNs are long-term municipal obligations that have variable or floating interest rates and provide the Portfolio with the right to tender the security for repurchase at its stated principal amount plus accrued interest. Such securities typically bear interest at a rate that is intended to cause the securities to trade at par. The interest rate may float or be adjusted at regular intervals (ranging from daily to annually), and is normally based on an applicable interest index or another published interest rate or interest rate index. Most VRDNs allow the Portfolio to demand the repurchase of the security on not more than seven days prior notice. Other notes only permit the Portfolio to tender the security at the time of each interest rate adjustment or at other fixed intervals. Variable interest rates generally reduce changes in the market value of municipal obligations from their original purchase prices. Accordingly, as interest rates decrease, the potential for capital appreciation is less for variable rate municipal obligations than for fixed income obligations.

Inverse Floating Rate Municipal Securities

The Portfolio may invest in inverse floating rate municipal securities or “inverse floaters,” whose rates vary inversely to interest rates on a specified short-term municipal bond index or on another instrument. Such securities involve special risks as compared to conventional fixed-rate bonds. Should short-term interest rates rise, the Portfolio’s investment in inverse floaters likely would adversely affect the Portfolio’s earnings and distributions to shareholders. Also, because changes in the interest rate on the other index or other instrument inversely affect the rate of interest received on an inverse floater, and because inverse floaters essentially represent a leveraged investment in a long-term bond, the value of an inverse floater is generally more volatile than that of a conventional fixed-rate bond having similar credit quality, redemption provisions and maturity. Although volatile in value, inverse floaters typically offer the potential for yields substantially exceeding the yields available on conventional fixed-rate bonds with comparable credit quality, coupon, call provisions and maturity.

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The markets for inverse floating rate securities may be less developed and have less liquidity than the markets for conventional securities. The Portfolio will only invest in inverse floating rate securities whose underlying bonds are rated A or higher.

Non-Investment Grade Debt Securities (Junk Bonds)

The Portfolio may invest in non-investment grade debt securities. Non-investment grade debt securities are medium- to low-quality municipal obligations. Municipal obligations rated below investment grade (BB/Ba or lower) are commonly known as “high-yield,” “high risk” or “junk” bonds. Junk bonds, while generally offering higher yields than investment grade securities with similar maturities, involve greater risks, including the possibility of default or bankruptcy. They are regarded as predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal. The special risk considerations in connection with investments in these securities are discussed below. Refer to Appendix A of this Statement of Additional Information for a discussion of securities ratings.

(1) Effect of Interest Rates and Economic Changes. All interest-bearing securities typically experience appreciation when interest rates decline and depreciation when interest rates rise. In addition, the market values of junk bond securities tend to reflect individual issuer developments to a greater extent than do the market values of higher rated securities, which react primarily to fluctuations in the general level of interest rates. Junk bond securities also tend to be more sensitive to economic conditions than are higher rated securities. As a result, they generally involve more credit risk than securities in the higher rated categories. During an economic downturn or a sustained period of rising interest rates, highly leveraged issuers of junk bond securities may experience financial stress and may not have sufficient revenues to meet their payment obligations. The risk of loss due to default by an issuer of these securities is significantly greater than by an issuer of higher rated securities because such securities are generally unsecured and are often subordinated to other creditors. Further, if the issuer of a junk bond security defaults, the Portfolio may incur additional expenses to seek recovery. Periods of economic uncertainty and changes would also generally result in increased volatility in the market prices of these and thus in the Portfolio’s net asset value.

The value of a junk bond security will generally decrease in a rising interest rate market and, accordingly, so will the Portfolio’s net asset value. If the Portfolio experiences unexpected net redemptions in such a market, it may be forced to liquidate a portion of its portfolio securities without regard to their investment merits. Due to the limited liquidity of certain junk bond securities, the Portfolio may be forced to liquidate these securities at a substantial discount. Any such liquidation would reduce the Portfolio’s asset base over which expenses could be allocated and could result in a reduced rate of return for the Portfolio.

(2) Payment Expectations. Junk bond securities typically contain redemption, call, or prepayment provisions that permit the issuer of securities containing such provisions to redeem the securities at its discretion. During periods of falling interest rates, issuers of these securities are likely to redeem or prepay the securities and refinance them with debt securities with a lower interest rate. To the extent an issuer is able to refinance the securities, or otherwise redeem them, the Portfolio may have to replace the securities with lower yielding securities, which could result in a lower return for the Portfolio.

(3) Credit Ratings. Credit ratings are issued by credit rating agencies and are indicative of the rated securities’ safety of principal and interest payments. They do not, however, evaluate the market value risk of junk bond securities and, therefore, may not fully reflect the true risks of such an investment. In addition, credit rating agencies may not make timely changes in a rating to reflect changes in the economy or in the condition of the issuer that affect the value of the security. Consequently, credit ratings are used only as a preliminary indicator of investment quality. Investments in junk bonds will depend more upon credit analysis by the Sub-Adviser than investments in investment grade debt securities. The Sub-Adviser employs its own credit research and analysis, which includes a study of the issuer’s existing debt, capital structure, ability to service debts and pay dividends, sensitivity to economic conditions, operating history, and current earnings trend. The Sub-Adviser continually monitors the Portfolio’s investments and carefully evaluates whether to dispose of or to retain junk bond securities whose credit ratings or credit quality may have changed.

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(4) Liquidity and Valuation. The Portfolio may have difficulty disposing of certain junk bond securities because there may be a thin trading market for such securities. Not all dealers maintain markets in all junk bond securities. As a result, there is no established retail secondary market for many of these securities. To the extent a secondary trading market does exist, it is generally not as liquid as the secondary market for higher rated securities. The lack of a liquid secondary market may have an adverse impact on the market price of the security. The lack of a liquid secondary market for certain securities may also make it more difficult for the Portfolio to obtain accurate market quotations for purposes of valuing its securities. Market quotations are generally available on many junk bond issues only from a limited number of dealers and may not necessarily represent firm bids of such dealers or prices for actual sales. During periods of thin trading, the spread between bid and asked prices is likely to increase significantly. In addition, adverse publicity and investor perceptions, whether or not based on fundamental analysis, may decrease the value and liquidity of junk bond securities, especially in a thinly traded market.

The Portfolio may invest up to 5% of its net assets in defaulted municipal obligations. Municipal obligations in the lowest rating categories may be in default and are generally regarded as having poor prospects of attaining any real investment standing. A default or expected default in a municipal obligation owned by the Portfolio could result in a significant decline in the value of that municipal obligation.

Payment-In-Kind Debentures and Delayed Interest Securities

The Portfolio may invest in debentures the interest on which may be paid in other securities rather than cash ( “PIKs” ) or may be delayed ( “delayed interest securities” ). Typically, during a specified term prior to the debenture’s maturity, the issuer of a PIK may provide for the option or the obligation to make interest payments in debentures, common stock or other instruments (i.e., “in kind” rather than in cash). The type of instrument in which interest may or will be paid would be known by the Portfolio at the time of investment. While PIKs generate income for purposes of generally accepted accounting standards, they do not generate cash flow and thus could cause the Portfolio to be forced to liquidate securities at an inopportune time in order to distribute cash, as required by the Code.

Unlike PIKs, delayed interest securities do not pay interest for a specified period. Because values of securities of this type are subject to greater fluctuations than are the values of securities that distribute income regularly, they may be more speculative than such securities.

Short-Term Investments

The Prospectus discusses briefly the ability of the Portfolio to invest a portion of its assets in federally tax-exempt or taxable short-term securities or shares of money market funds (“short-term investments”). The Portfolio will invest only in taxable short-term investments that are either (i) U.S. government securities, (ii) rated within the highest grade by Moody’s Investors Service, Inc. (“ Moody’s ”), Standard & Poor’s Rating Services, a division of The McGraw-Hill Companies, Inc., (“ Standard & Poor’s ”) or Fitch, Inc. (“ Fitch ”) and mature within one year from the date of purchase or carry a variable or floating rate of interest or (iii) taxable money market funds. See Appendix A for more information about ratings by Moody’s, Standard & Poor’s, and Fitch.

Tax-Exempt Short Term Investments

The federally tax-exempt short-term investments the Portfolio may invest in include, but are not limited to, the following:

Bond Anticipation Notes (“BANs”) are usually general obligations of state and local governmental issuers, which are sold to obtain interim financing for projects that will eventually be funded through the sale of long-term debt obligations or bonds. The ability of an issuer to meet its obligations on its BANs is primarily dependent on the issuer’s access to the long-term municipal bond market and the likelihood that the proceeds of such bond sales will be used to pay the principal and interest on the BANs.

Tax Anticipation Notes (“TANs”) are issued by state and local governments to finance the current operations of such governments. Repayment is generally to be derived from specific

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future tax revenues. Tax anticipation notes are usually general obligations of the issuer. A weakness in an issuer’s capacity to raise taxes due to, among other things, a decline in its tax base or a rise in delinquencies, could adversely affect the issuer’s ability to meet its obligations on outstanding TANs.

Revenue Anticipation Notes (“RANs”) are issued by governments or governmental bodies with the expectation that future revenues from a designated source will be used to repay the notes. In general, they also constitute general obligations of the issuer. A decline in the receipt of projected revenues, such as anticipated revenues from another level of government, could adversely affect an issuer’s ability to meet its obligations on outstanding RANs. In addition, the possibility that the revenues would, when received, be used to meet other obligations could affect the ability of the issuer to pay the principal and interest on RANs.

Construction Loan Notes are issued to provide construction financing for specific projects. Frequently, these notes are redeemed with funds obtained from the Federal Housing Administration.

Bank Notes are notes issued by local government bodies and agencies as those described above to commercial banks as evidence of borrowings. The purposes for which the notes are issued are varied, but they are frequently issued to meet short-term working capital or capital-project needs. These notes may have risks similar to the risks associated with TANs and RANs.

Tax-Exempt Commercial Paper (Municipal Paper) represents very short-term unsecured, negotiable promissory notes, issued by states, municipalities and their agencies. Payment of principal and interest on issues of municipal paper may be made from various sources, to the extent the funds are available therefrom. Maturities of municipal paper generally will be shorter than the maturities of TANs, BANs or RANs. There is a limited secondary market for issues of municipal paper.

Certain municipal obligations may carry variable or floating rates of interest whereby the rate of interest is not fixed, but varies with changes in specified market rates or indices, such as a bank prime rate or a tax-exempt money market index.

While these various types of notes as a group represent the major portion of the tax-exempt note market, other types of notes are occasionally available in the marketplace and the Portfolio may invest in such other types of notes to the extent permitted under its investment objectives, policies and limitations. Such notes may be issued for different purposes and may be secured differently from those mentioned above.

Municipal Money Market Funds that pay interest income exempt from regular federal and, in some cases, state and local income taxes. The Portfolio will bear its proportionate share of the money market fund’s fees and expenses.

Taxable Short Term Investments

The Portfolio may also invest in the following taxable short-term investments. Interest on each such instrument is taxable for federal income tax purposes and would reduce the amount of tax-free interest payable to shareholders.

Certificates of Deposit (CDs) —A certificate of deposit is a negotiable interest bearing instrument with a specific maturity. CDs are issued by banks in exchange for the deposit of funds and normally can be traded in the secondary market, prior to maturity. The Portfolio will only invest in U.S. dollar denominated CDs issued by U.S. banks with assets of $1 billion or more.

Commercial Paper —Commercial paper is the term used to designate unsecured short-term promissory notes issued by corporations. Maturities on these issues vary from a few days to nine months. Commercial paper may be purchased from U.S. corporations.

Taxable Money Market Funds —These funds pay interest income that is taxable on the federal and state levels. The Portfolio will bear its proportionate share of the money market fund’s fees and expenses.

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U.S. Government Direct Obligations are issued by the United States Treasury and include bills, notes and bonds.

U.S. Government Agencies Securities —Certain federal agencies have been established as instrumentalities of the U.S. government to supervise and finance certain types of activities. These agencies include, but are not limited to, the Bank for Cooperatives, Federal Land Banks, Federal Intermediate Credit Banks, Federal Home Loan Banks, Federal National Mortgage Association, Government National Mortgage Association, Export-Import Bank of the United States, and Tennessee Valley Authority. Issues of these agencies, while not direct obligations of the U.S. government, are either backed by the full faith and credit of the United States or are guaranteed by the Treasury or supported by the issuing agencies’ right to borrow from the Treasury. There can be no assurance that the U.S. government itself will pay interest and principal on securities as to which it is not legally so obligated.

Other Corporate Obligations —The Portfolio may purchase notes, bonds and debentures issued by corporations if at the time of purchase there is less than one year remaining until maturity or if they carry a variable or floating rate of interest.

Repurchase Agreements —The Portfolio may invest temporarily up to 5% of its assets in repurchase agreements, which are agreements pursuant to which securities are acquired by the Portfolio from a third party with the understanding that they will be repurchased by the seller at a fixed price on an agreed date. These agreements may be made with respect to any of the portfolio securities in which the Portfolio is authorized to invest. Repurchase agreements may be characterized as loans secured by the underlying securities. The Portfolio may enter into repurchase agreements with (i) member banks of the Federal Reserve System having total assets in excess of $500 million and (ii) securities dealers, provided that such banks or dealers meet the creditworthiness standards established by the Portfolio’s Board of Trustees (“Qualified Institutions”). Nuveen Asset Management will monitor the continued creditworthiness of Qualified Institutions, subject to the oversight of the Portfolio’s Board of Trustees.

The use of repurchase agreements involves certain risks. For example, if the seller of securities under a repurchase agreement defaults on its obligation to repurchase the underlying securities, as a result of its bankruptcy or otherwise, the Portfolio will seek to dispose of such securities, which action could involve costs or delays. If the seller becomes insolvent and subject to liquidation or reorganization under applicable bankruptcy or other laws, the Portfolio’s ability to dispose of the underlying securities may be restricted. Finally, it is possible that the Portfolio may not be able to substantiate its interest in the underlying securities. To minimize this risk, the securities underlying the repurchase agreement will be held by the custodian at all times in an amount at least equal to the repurchase price, including accrued interest. If the seller fails to repurchase the securities, the Portfolio may suffer a loss to the extent proceeds from the sale of the underlying securities are less than the repurchase price.

The resale price reflects the purchase price plus an agreed upon market rate of interest that is unrelated to the coupon rate or date of maturity of the purchased security. The collateral is marked to market daily. Such agreements permit the Portfolio to keep all its assets earning interest while retaining “overnight” flexibility in pursuit of investments of a longer-term nature.

Standby Commitments

The Portfolio may obtain standby commitments when it purchases municipal obligations. A standby commitment gives the holder the right to sell the underlying security to the seller at an agreed-upon price on certain dates or within a specified period. The Portfolio will acquire standby

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commitments solely to facilitate portfolio liquidity and not with a view to exercising them at a time when the exercise price may exceed the current value of the underlying securities. If the exercise price of a standby commitment held by the Portfolio should exceed the current value of the underlying securities, the Portfolio may refrain from exercising the standby commitment in order to avoid causing the issuer of the standby commitment to sustain a loss and thereby jeopardizing the Portfolio’s business relationship with the issuer. The Portfolio will enter into standby commitments only with banks and securities dealers that, in the opinion of Nuveen Asset Management, present minimal credit risks. However, if a securities dealer or bank is unable to meet its obligation to repurchase the security when the Portfolio exercises a standby commitment, the Portfolio might be unable to recover all or a portion of any loss sustained from having to sell the security elsewhere. Standby commitments will be valued at zero in determining the Portfolio’s net asset value.

Structured Notes

The Portfolio may invest in structured notes, including “total rate of return swaps” with rates of return determined by reference to the total rate of return on one or more loans references in such notes. The rate of return on a structured note may be determined by applying a multiplier to the rate of total return on the referenced loan or loans. Application of a multiplier is comparable to the use of leverage which magnifies the potential for gain and the risk of loss because a relatively small decline in the value of a referenced note could result in a relatively large loss in the value of the structured note.

Variable, Floating, and Fixed Rate Debt Obligations

The debt obligations in which the Portfolio invests may have variable, floating, or fixed interest rates. Variable rate securities provide for periodic adjustments in the interest rate. Floating rate securities are generally offered at an initial interest rate which is at or above prevailing market rates. The interest rate paid on floating rate securities is then reset periodically (commonly every 90 days) to an increment over some predetermined interest rate index. Commonly utilized indices include the three-month Treasury bill rate, the 180-day Treasury bill rate, the one-month or three-month London Interbank Offered Rate (LIBOR), the prime rate of a bank, the commercial paper rates, or the longer-term rates on U.S. Treasury securities. Variable and floating rate securities are relatively long-term instruments that often carry demand features permitting the holder to demand payment of principal at any time or at specified intervals prior to maturity plus accrued interest. In order to most effectively use these securities, the Sub-Adviser must correctly assess probable movements in interest rates. If the Sub-Adviser incorrectly forecasts such movements, the Portfolio could be adversely affected by use of variable and floating rate securities.

Fixed rate securities pay a fixed rate of interest and tend to exhibit more price volatility during times of rising or falling interest rates than securities with variable or floating rates of interest. The value of fixed rate securities will tend to fall when interest rates rise and rise when interest rates fall. The value of variable or floating rate securities, on the other hand, fluctuates much less in response to market interest rate movements than the value of fixed rate securities. This is because variable and floating rate securities behave like short-term instruments in that the rate of interest they pay is subject to periodic adjustments according to a specified formula, usually with reference to some interest rate index or market interest rate. Fixed rate securities with short-term characteristics are not subject to the same price volatility as fixed rate securities without such characteristics. Therefore, they behave more like variable or floating rate securities with respect to price volatility.

When-Issued or Delayed-Delivery Securities

The Portfolio may purchase and sell municipal obligations on a when-issued or delayed-delivery basis. When-issued and delayed-delivery transactions arise when securities are purchased or sold with payment and delivery beyond the regular settlement date. (When-issued transactions normally settle within 15-45 days.) On such transactions the payment obligation and the interest rate are fixed at the time the buyer enters into the commitment. The commitment to purchase securities on a when-issued or delayed-delivery basis may involve an element of risk because the value of the securities is subject to market fluctuation, no interest accrues to the purchaser prior to settlement of the transaction, and at the time of delivery the market value may be less than cost. At the time the Portfolio makes the commitment to purchase a municipal obligation on a when-issued or delayed-delivery basis, it will record the transaction and reflect the amount due and the value of the security in determining its net asset value.

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Likewise, at the time the Portfolio makes the commitment to sell a municipal obligation on a delayed-delivery basis, it will record the transaction and include the proceeds to be received in determining its net asset value; accordingly, any fluctuations in the value of the municipal obligation sold pursuant to a delayed-delivery commitment are ignored in calculating net asset value so long as the commitment remains in effect. The Portfolio will maintain designated readily marketable assets at least equal in value to commitments to purchase when-issued or delayed-delivery securities, such assets to be designated or segregated by the custodian specifically for the settlement of such commitments, if necessary. The Portfolio will only make commitments to purchase municipal obligations on a when-issued or delayed-delivery basis with the intention of actually acquiring the securities, but the Portfolio reserves the right to sell these securities before the settlement date if it is deemed advisable. If a when-issued security is sold before delivery any gain or loss would not be tax-exempt. The Portfolio commonly engages in when- issued transactions in order to purchase or sell newly-issued municipal obligations, and may engage in delayed-delivery transactions in order to manage its operations more effectively.

The Portfolio also may buy when-issued and delayed-delivery securities that settle more than 60 days after purchase. These transactions are called “forwards.” Municipal forwards pay higher interest after settlement than standard bonds, to compensate the buyer for bearing market risk and deferring income during the settlement period, and can often be bought at attractive prices and yields. If the Portfolio knows that a portfolio bond will, or is likely to, be called or mature on a specific future date, the Portfolio may buy forwards settling on or about that date to replace the called or maturing bond and “lock in” a currently attractive interest rate. The Portfolio also may invest up to 15% of its assets in forwards that do not serve to replace a specific portfolio bond.

Zero Coupon and Step Coupon Securities

The Portfolio may invest in zero coupon and step coupon securities. Zero coupon securities pay no cash income to their holders until they mature. When held to maturity, their entire return comes from the difference between their purchase price and their maturity value. Step coupon securities are debt securities that may not pay interest for a specified period of time and then, after the initial period, may pay interest at a series of different rates. Both zero coupon and step coupon securities are issued at substantial discounts from their value at maturity. Because interest on these securities is not paid on a current basis, the values of securities of this type are subject to greater fluctuations than are the value of securities that distribute income regularly and may be more speculative than such securities. Accordingly, the values of these securities may be highly volatile as interest rates rise or fall. In addition, while such securities generate income for purposes of generally accepted accounting standards, they do not generate cash flow and thus could cause the Portfolio to be forced to liquidate securities at an inopportune time in order to distribute cash, as required by the Code.

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