82

The information in this Statement of Additional Information is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This Statement of Additional Information, which is not a prospectus, is not an offer to sell these securities and it is not soliciting an offer to buy these securities in any state or jurisdiction where the offer or sale is not permitted.

Subject to Completion, dated December 26, 2018

LORD ABBETT CREDIT OPPORTUNITIES FUND

Common Shares

Institutional Class Shares

Statement of Additional Information

January [   ], 2019

Lord Abbett Credit Opportunities Fund (the “Fund”) is a newly organized Delaware statutory trust that is registered under the Investment Company Act of 1940, as amended (the “1940 Act”). The Fund is a non-diversified, closed-end management investment company that is operated as an “interval fund.”

This Statement of Additional Information (this “Statement of Additional Information”) is not a prospectus and is authorized for distribution to prospective investors only if preceded or accompanied by the prospectus. This Statement of Additional Information should be read in conjunction with the prospectus dated January [ ], 2019, a copy of which may be obtained upon request and without charge by writing to the Fund at Lord Abbett Distributor LLC, 90 Hudson Street, Jersey City, NJ 07302 or by calling toll-free 888-522-2388 or by accessing the Fund’s website at www.lordabbett.com. The information on the website is not incorporated by reference into this Statement of Additional Information and investors should not consider it a part of this Statement of Additional Information. The prospectus, and other information about the Fund, is also available on the U.S. Securities and Exchange Commission’s (the “SEC”) website at http://www.sec.gov. The address of the SEC’s website is provided solely for the information of prospective investors and is not intended to be an active link.

Capitalized terms used but not defined in this Statement of Additional Information have the meanings ascribed to them in the prospectus.

1. THE FUND

The Fund is a non-diversified, closed-end management investment company that continuously offers its Shares and is operated as an “interval fund.” The Fund currently offers one class of Shares: Institutional Class. The Fund was formed on September 18, 2018 as a Delaware statutory trust.

2. INVESTMENT OBJECTIVE, POLICIES, AND RISKS

This section provides further information on certain types of investments and investment techniques that the Fund may use and some of the risks associated with such investments and techniques. The composition of the Fund’s portfolio and the investments and techniques that the Fund uses in seeking its investment objective and employing its investment strategies will vary over time. The Fund may use the investments and techniques described below at all times, at some times, or not at all.

Duration . Duration is a measure of the expected life of a bond or other fixed income instrument on a present value basis. Duration incorporates the bond or other fixed income instrument’s yield, coupon interest payments, final maturity, and call features into one measure. Duration allows an investment adviser to make certain predictions as to the effect that changes in the level of interest rates will have on the value of the Fund’s portfolio of bonds or fixed income instruments. However, various factors, such as changes in anticipated prepayment rates, qualitative considerations, and market supply and demand, can cause particular securities to respond somewhat differently to changes in interest rates. Moreover, in the case of mortgage-backed and other complex securities, duration calculations are estimates and are not precise. This is particularly true during periods of market volatility.

The Fund’s portfolio will have a duration that is equal to the weighted average of the durations of the bonds or other fixed income instruments in its portfolio. The longer the Fund’s portfolio’s duration, the more sensitive it is to interest rate risk. The shorter the Fund’s portfolio’s duration, the less sensitive it is to interest rate risk. For example, the value of a portfolio with a duration of five years would be expected to fall approximately five percent if interest rates rose by one percentage point and the value of a portfolio with a duration of two years would be expected to fall approximately two percent if interest rates rose by one percentage point.

Some securities may have periodic interest rate adjustments based upon an index such as the 90-day Treasury Bill rate. This periodic interest rate adjustment tends to lessen the volatility of the security’s price. With respect to securities with an interest rate adjustment period of one year or less, the Fund will, when determining average- weighted duration, treat such a security’s maturity as the amount of time remaining until the next interest rate adjustment.

Instruments such as securities guaranteed by the Government National Mortgage Association (“Ginnie Mae”), the Federal National Mortgage Association (“Fannie Mae”), and the Federal Home Loan Mortgage Corporation (“Freddie Mac”) and similar securities backed by amortizing loans generally have shorter effective maturities than their stated maturities. This is due to changes in amortization caused by demographic and economic forces such as interest rate movements. These effective maturities are calculated based upon historical payment patterns and, therefore, have a shorter duration than would be implied by their stated final maturity. For purposes of determining the Fund’s average maturity, the maturities of such securities will be calculated based upon the issuing agency’s payment factors using industry accepted valuation models.

Borrowing Money . The Fund may borrow money or otherwise use financial leverage, as described more fully under “Leverage” in the prospectus.

Cash Management Practices . The Fund receives cash as a result of investments in the Fund’s shares, from the sale of the Fund’s investments, and from any income or dividends generated by its portfolio investments and may handle that cash in different ways. The Fund may maintain a cash balance pending investments in other securities, payment of dividends or repurchase consideration, or in other circumstances where the Fund’s portfolio management team believes additional liquidity is necessary or advisable. To the extent that the Fund maintains a cash balance, that portion of the Fund’s portfolio will not be exposed to the potential returns (positive or

negative) of the market in which the Fund typically invests. The Fund may invest its cash balance in short-term investments, such as repurchase agreements.

Consistent with its investment objective, policies, and restrictions, however, the Fund also may invest in securities, such as exchange-traded funds (“ETFs”), or derivatives related to its cash balance. For example, the Fund may buy index futures with an aggregate notional amount that approximately offsets its cash balance to efficiently provide investment exposure while maintaining liquidity or accumulating cash pending purchases of individual securities. In addition, the Fund may buy or sell futures contracts in response to purchases of Fund shares or participation in repurchase offers in order to maintain market exposure consistent with the Fund’s investment objective and strategies. When investing in this manner, the Fund may maintain a net short position with respect to futures, but would segregate liquid assets to cover its net payment obligations.

These cash management practices are ancillary to, and not part of, the Fund’s principal investment strategies. As such, the Fund does not intend to invest substantially in this manner under normal circumstances.

Collateralized Loan Obligations and Other Collateralized Obligations . A collateralized loan obligation (“CLO”) is a type of structured product that issues securities collateralized by a pool of loans, which may include, among others, domestic and foreign senior secured loans, senior unsecured loans, second lien loans, and subordinate corporate loans. The underlying loans may be rated below investment grade by a rating agency. A CLO is not merely a conduit to a portfolio of loans; it is a pooled investment vehicle that may be actively managed by the collateral manager. Therefore, an investment in a CLO can be viewed as investing in (or through) another investment adviser and is subject to the layering of fees associated with such an investment.

The cash flows from a CLO are divided into two or more classes called “tranches,” each having a different risk- reward structure in terms of the right (or priority) to receive interest payments from the CLO. The risks of an investment in a CLO depend largely on the type of the collateral held in the CLO portfolio and the tranche of securities in which the Fund invests. Generally, the risks of investing in a CLO can be summarized as a combination of economic risks of the underlying loans combined with the risks associated with the CLO structure governing the priority of payments. In addition to the general risks associated with fixed income securities and structured products discussed elsewhere in this Statement of Additional Information and in the prospectus, CLOs carry additional risks including but not limited to the following:

change without visibility to the CLO investors.

Other structured products in which the Fund may invest include collateralized debt obligations (“CDOs”), collateralized bond obligations (“CBOs”), and collateralized mortgage obligations (“CMOs”). A CDO is a security backed by pools of corporate or sovereign bonds, bank loans to corporations, or a combination of bonds and loans, many of which may be unsecured. A CBO is an obligation of a trust or other special purpose vehicle backed by a pool of fixed income securities, which are often a diversified pool of securities that are high risk and below investment grade. These securities are collateralized by many different types of fixed income securities, including high-yield debt, trust preferred securities, and emerging market debt, which are subject to varying degrees of credit and counterparty risk. A CMO is a security that is collateralized by whole loan mortgages or mortgage pass- through securities. CMOs, CDOs and CBOs are structured similarly to CLOs and carry additional risks that include, but are not limited to, the risks of investing in CLOs described above and the risks associated with the pool of underlying securities. For more information about CMOs, please see “Collateralized Mortgage Obligations and Real Estate Mortgage Investment Conduits” below.

Convertible Securities . Convertible securities are preferred stocks or debt obligations that may be converted into or exchanged for shares of common stock (or cash or other securities) of the same or a different issuer at a stated price or exchange ratio. Convertible securities generally rank senior to common stock in a corporation’s capital structure but usually are subordinated to comparable non-convertible securities. A convertible security entitles the holder to receive a dividend or interest that generally is paid or accrued on the underlying security until the convertible security matures or is redeemed, converted, or exchanged. While convertible securities generally do not participate directly in any dividend increases or decreases of the underlying securities, market prices of convertible securities may be affected by such dividend changes or other changes in the underlying securities. In addition, if the market price of the common stock underlying a convertible security approaches or exceeds the conversion price of the convertible security, the convertible security tends to reflect the market price of the underlying common stock. Alternatively, a convertible security may lose much or all of its value if the value of the underlying common stock falls below the conversion price of the security.

Convertible securities have both equity and fixed income risk characteristics. A significant portion of convertible securities have below investment grade credit ratings and are subject to increased credit and liquidity risks. A convertible security may be subject to redemption at the option of the issuer at a price established in the convertible security’s governing instrument. If a convertible

security held by the Fund is called for redemption, the Fund will be required to convert it into the underlying common stock, sell it to a third party, or permit the issuer to redeem the security. Any of these actions could have an adverse effect on the Fund’s ability to achieve its investment objective, which, in turn, could result in losses to the Fund.

Synthetic convertible securities are derivative instruments comprising two or more securities whose combined investment characteristics resemble a convertible security. A typical convertible security combines fixed income securities or preferred stock with an equity component, such as a warrant, which offers the potential to own the underlying equity security. The value of a synthetic convertible security may respond differently to market fluctuations than the value of a traditional convertible security in response to the same market fluctuations.

Credit Rating Agencies . Credit rating agencies are companies that assign credit ratings, which operate as a preliminary evaluation of the credit risk of a prospective debtor. Credit rating agencies include, but are not limited to, S&P, Moody’s, and Fitch. Credit ratings are provided by credit rating agencies that specialize in evaluating credit risk, but there is no guarantee that a highly rated debt instrument will not default or be downgraded. Credit ratings issued by these agencies are designed to evaluate the safety of principal and interest payments of rated securities. They do not evaluate the market risk and, therefore, may not fully reflect the true risks of an investment. In addition, credit rating agencies may not make timely changes in a rating to reflect changes in the economy or in the conditions of the issuer that affect the market value of the security. Consequently, credit ratings are used only by Lord Abbett, the Fund’s investment adviser, as a preliminary indicator of investment quality. Lord Abbett may use any Nationally Recognized Statistical Rating Organization when evaluating investment quality. Each agency applies its own methodology in measuring creditworthiness and uses a specific rating scale to publish its ratings opinions. More information on credit rating agency ratings is located in Appendix B.

Debt Securities . Debt securities are used by issuers to borrow money. The issuer usually pays a fixed, variable, or floating rate of interest and typically must repay the amount borrowed at the maturity of the instrument. Debt securities include, but are not limited to, bonds, debentures, government obligations, commercial paper, repurchase agreements, and pass-through instruments. A debt security is typically considered “investment grade” if it is rated BBB/Baa or higher by a rating agency or if Lord Abbett determines the security to be of comparable quality. For a discussion of the specific risks associated with debt securities not considered “investment grade,” please see “High-Yield or Lower-Rated Debt Securities” below.

Risks Affecting Debt Securities . Prices of debt securities fluctuate and, in particular, are subject to several key risks including, but not limited to, interest rate risk, credit risk, prepayment risk, extension risk, and spread risk.

When interest rates rise or the issuer’s or the counterparty’s financial condition worsens or is perceived by the market to be at greater risk, the value of debt securities typically declines. Investments in debt securities may face a heightened level of interest rate risk, especially because the Federal Reserve Board has begun to raise rates after a period of historically low rates. While fixed income securities with longer final maturities often have higher yields than those with shorter maturities, their prices are usually more sensitive to changes in interest rates and other factors.

Credit risk, also known as default risk, represents the possibility that an issuer may be unable to meet scheduled interest and principal payment obligations. If the market perceives a deterioration in the creditworthiness of an issuer, the value and liquidity of debt securities issued by that issuer may decline. Spread risk is the potential for the value of the Fund’s debt security investments to fall due to the widening of spreads. Debt securities generally compensate for greater credit risk by paying interest at a higher rate. The difference (or “spread”) between the yield of a security and the

yield of a benchmark, such as a U.S. Treasury security with a comparable maturity, measures the additional interest paid for such greater credit risk. As the spread on a security widens (or increases), the price (or value) of the security falls. Spread widening may occur, among other reasons, as a result of market concerns over the stability of the market, excess supply, general credit concerns in other markets, security- or market-specific credit concerns, or general reductions in risk tolerance.

Prepayment risk, also known as call risk, arises due to the issuer’s ability to prepay all or most of the debt security before the stated final maturity date. Prepayments generally rise in response to a decline in interest rates as debtors take advantage of the opportunity to refinance their obligations. This risk often is associated with mortgage securities where the underlying mortgage loans can be refinanced, although it also can be present in corporate or other types of bonds with call provisions. When a prepayment occurs, the Fund may be forced to reinvest in lower yielding debt securities. Extension risk is the chance that, during periods of rising interest rates, certain debt obligations will be paid off substantially more slowly than originally anticipated, and the value of those securities may fall. Extension risk generally is low for short-term bond funds, moderate for intermediate- term bond funds, and high for long-term bond funds.

Debt securities trade on an over-the counter (“OTC”) basis in which parties buy and sell securities through bilateral transactions. While the total amount of assets invested in debt markets has grown in recent years, the capacity for traditional dealer counterparties to engage in debt trading has not kept pace and has decreased, in part due to regulations and capital requirements applicable to these entities. As a result, because market makers provide stability to a market through their intermediary services, a significant reduction in dealer inventories has decreased liquidity and potentially could increase volatility in the debt markets. Such issues may be exacerbated during periods of economic uncertainty or market volatility.

Economic, political, and other events also may affect the prices of broad debt markets, although the risks associated with such events are transmitted to the market via changes in the prevailing levels of interest rates, credit risk, prepayment risk, or spread risk.

Many debt securities use or may use a floating rate based on the London Interbank Offered Rate, or “LIBOR,” which is the offered rate for short-term Eurodollar deposits between major international banks. On July 27, 2017, the head of the United Kingdom’s (“UK”) Financial Conduct Authority announced a desire to phase out the use of LIBOR by the end of 2021. There remains uncertainty regarding the future utilization of LIBOR and the nature of any replacement rate. As such, the potential effect of a transition away from LIBOR on the Fund or the debt securities or other instruments in which the Fund invests cannot yet be determined.

Depositary Receipts . The Fund may invest in American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”), and similar depositary receipts. ADRs typically are trust receipts issued by a U.S. bank or trust company or other financial institution (a “depositary”) that evidence an indirect interest in underlying securities issued by a foreign entity and deposited with the depositary. Prices of ADRs are quoted in U.S. dollars, and ADRs are listed and traded in the United States. GDRs typically are issued by non-U.S. banks or financial institutions (a “foreign depositary”) to evidence an interest in underlying securities issued by either a U.S. or a non-U.S. entity and deposited with the foreign depositary. Ownership of ADRs and GDRs entails similar investment risks to direct ownership of foreign securities traded outside the United States, including increased market, liquidity, currency, political, information, and other risks. To the extent the Fund acquires depositary receipts through banks that do not have a contractual relationship to issue and service unsponsored depositary receipts with the foreign issuer of the underlying security underlying the depositary receipts, there is an increased possibility that the Fund will not become aware of, and, thus, be able to respond to, corporate actions such as stock splits or rights offerings involving the

issuer in a timely manner. In addition, the lack of information may affect the accuracy of the valuation of such instruments. The market value of depositary receipts is dependent upon the market value of the underlying securities and fluctuations in the relative value of the currencies in which the depositary receipts and the underlying securities are quoted. However, by investing in certain depositary receipts, such as ADRs, which are quoted in U.S. dollars, the Fund may avoid currency risks during the payment and delivery (“settlement”) period for purchases and sales.

Defaulted Bonds and Distressed Debt . Defaulted bonds are subject to greater risk of loss of income and principal than higher rated securities and are considered speculative. In the event of a default, the Fund may incur additional expenses to seek recovery. The repayment of defaulted bonds is subject to significant uncertainties, and, in some cases, there may be no recovery of repayment. Further, defaulted bonds might be repaid only after lengthy workout or bankruptcy proceedings, during which the issuer might not make any interest or other payments. Workout or bankruptcy proceedings typically result in only partial recovery of cash payments or an exchange of the defaulted bond for other securities of the issuer or its affiliates. Often, the securities received are illiquid or speculative. Investments in securities following a workout or bankruptcy proceeding typically entail a higher degree of risk than investments in securities that have not recently undergone a reorganization or restructuring. Moreover, these securities can be subject to heavy selling or downward pricing pressure after the completion of a workout or bankruptcy proceeding. If the Fund’s evaluation of the anticipated outcome of an investment should prove inaccurate, the Fund could experience a loss. Such securities obtained in exchange may include, but are not limited to, equity securities, warrants, rights, participation interests in sales of assets, and contingent interest obligations.

The Fund may hold securities of issuers that are, or are about to be, involved in reorganizations, financial restructurings, or bankruptcy (also known as ‘‘distressed debt’’). Defaulted bonds and distressed debt securities are speculative and involve substantial risks in addition to the risks of investing in junk bonds. To the extent that the Fund holds distressed debt, that Fund will be subject to the risk that it may lose a portion or all of its investment in the distressed debt and may incur higher expenses trying to protect its interests in distressed debt. The prices of distressed bonds are likely to be more sensitive to adverse economic changes or individual issuer developments than the prices of higher rated securities. During an economic downturn or substantial period of rising interest rates, distressed security issuers may experience financial stress that would adversely affect their ability to service their principal and interest payment obligations, to meet their projected business goals, or to obtain additional financing. The Fund may invest in additional securities of a defaulted issuer to retain a controlling stake in any bankruptcy proceeding or workout. Even if the Fund invests in tax-exempt bonds, it may receive taxable bonds in connection with the terms of a restructuring deal, which could result in taxable income to investors. In addition, any distressed securities or any securities received in exchange for such securities may be subject to restrictions on resale. In any reorganization or liquidation proceeding, the Fund may lose its entire investment or may be required to accept cash or securities with a value less than its original investment. Moreover, it is unlikely that a liquid market will exist for the Fund to sell its holdings in distressed debt securities.

Derivatives . The Fund may invest in, or enter into, derivatives for a variety of reasons, including to hedge certain market or interest rate risks, to provide a substitute for purchasing or selling particular securities, or to increase potential returns. Generally, derivatives are financial contracts whose values depend upon, or are derived from, the value of an underlying asset, reference rate or index, and may relate to stocks, bonds, interest rates, currencies or currency exchange rates, commodities and other assets, and related indices. Examples of derivative instruments the Fund may use include options contracts, futures contracts, options on futures contracts, forward currency contracts, structured notes, swap agreements, and credit derivatives. Derivatives may provide a cheaper, quicker, or more efficient or specifically focused way for the Fund to invest or to hedge

than “traditional” securities would. The Fund’s portfolio management team, however, may decide not to employ some or all of these strategies. Similarly, suitable derivatives transactions may not be available or available on the terms desired, and derivatives transactions may not perform as intended. There is no assurance that any derivatives strategy used by the Fund will succeed.

Derivatives can be volatile and involve various types and degrees of risk, depending upon the characteristics of the particular derivative and the portfolio as a whole. Derivatives permit the Fund 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 Fund 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 or notional value would suggest, meaning that a small investment in derivatives could have a large potential impact on the Fund’s performance. The Fund’s notional derivatives exposure and/or the percentage of total investment exposure may be greater than the total value of its assets, which would have the result of leveraging the Fund.

If the Fund invests in derivatives at inopportune times or judges market conditions incorrectly, such investments may lower the Fund’s return or result in a loss. The Fund also could experience losses if its derivatives were poorly correlated with its other investments (or not correlated as expected), or if the Fund were unable to liquidate its position because of an illiquid secondary market. The market for many derivatives is, or suddenly can become, illiquid. Changes in liquidity may result in significant, rapid, and unpredictable changes in the prices for derivatives.

Derivatives may be purchased on established exchanges or through privately negotiated transactions (referred to as “OTC derivatives”). Exchange-traded derivatives generally are guaranteed by the clearing agency that is the issuer or counterparty to such derivatives. This guarantee usually is supported by a daily variation margin system operated by the clearing agency in order to reduce overall credit risk. As a result, unless the clearing agency defaults, there is relatively little counterparty credit risk associated with derivatives purchased on an exchange. In contrast, many OTC derivatives are not guaranteed by a clearing agency. Therefore, each party to an OTC derivative that is not centrally cleared bears the risk that the counterparty will default. Accordingly, Lord Abbett will consider the creditworthiness of counterparties to non-centrally cleared OTC derivatives in the same manner as it would review the credit quality of a security to be purchased by the Fund. OTC derivatives generally are less liquid than exchange-traded derivatives.

New requirements also may result in increased uncertainty about counterparty credit risk, and they also may limit the flexibility of the Fund to protect its interests in the event of an insolvency of a derivatives counterparty. In the event of a counterparty’s (or its affiliate’s) insolvency, the Fund’s ability to exercise remedies, such as the termination of transactions, netting of obligations and realization of collateral, could be stayed or eliminated under new special resolution regimes adopted in the United States, the European Union and various other jurisdictions. Such regimes provide government authorities with broad authority to intervene when a financial institution is experiencing financial difficulty and may prohibit the Fund from exercising termination rights based on the financial institution’s insolvency. In particular, with respect to counterparties who are subject to such proceedings in the European Union, the liabilities of such counterparties to the Fund could be reduced, eliminated, or converted to equity in such counterparties (sometimes referred to as a “bail in”).

Asset Coverage. The Fund will be required to “set aside” liquid assets (often referred to as “asset segregation”), or engage in other SEC staff-approved measures (such as entering into offsetting transactions) to “cover” open positions with respect to certain kinds of derivatives. The amount and type of assets set aside will depend on the nature and type of the transaction, the Fund’s current and potential obligations under the transaction, and other factors considered by Lord Abbett, and

may not equal the amount of the derivative’s full notional value. To the extent the Fund sets aside assets equal to only its net obligations under a derivative, the Fund may be employing leverage to a greater extent than if the Fund were to segregate assets equal to the full notional value of such transactions. The Fund reserves the right to modify its asset segregation policies in the future.

Regulatory and Market Considerations. New U.S. and non-U.S. rules and regulations could, among other things, further restrict the Fund’s ability to engage in, or increase the cost to the Fund of, derivatives transactions by, for example, making some types of derivatives no longer available to the Fund or making them less liquid. The implementation of the clearing requirement has increased the costs of derivatives transactions for the Fund, because the Fund has to pay fees to its clearing members and is typically required to post more margin for cleared derivatives than it has historically posted for bilateral derivatives. The costs of derivatives transactions are expected to increase further as clearing members raise their fees to cover the costs of additional capital requirements and other regulatory changes applicable to the clearing members. These rules and regulations are new and evolving, so their potential impact on the Fund and the financial system are not yet known. While the new rules and regulations and central clearing of some derivatives transactions are designed to reduce systemic risk ( i.e. , the risk that the interdependence of large derivatives dealers could cause them to suffer liquidity, solvency, or other challenges simultaneously), there is no assurance that they will achieve that result, and, in the meantime, central clearing and related requirements expose the Fund to new kinds of costs and risks.

Credit Derivatives. The Fund may engage in credit derivative transactions, such as those involving default price risk derivatives and market spread derivatives. Default price risk derivatives are linked to the price of reference securities or loans after a default by the issuer or borrower, respectively. Market spread derivatives are based on the risk that changes in certain market factors, such as credit spreads, can cause a decline in the value of a security, loan, or index. There are three basic transactional forms for credit derivatives: swaps, options, and structured instruments. The use of credit derivatives is a highly specialized activity that involves strategies and risks different from those associated with ordinary portfolio security transactions. If Lord Abbett is incorrect in its forecasts of default risks, market spreads, or other applicable factors, the investment performance of the Fund would diminish compared with what it would have been if these techniques were not used. Moreover, even if Lord Abbett is correct in its forecasts, there is a risk that a credit derivative position may correlate imperfectly with the price of the asset or liability being hedged. The Fund’s risk of loss in a credit derivative transaction varies with the form of the transaction. For example, if the Fund purchases a default option on a security, and, if no default occurs, with respect to the security, the Fund’s loss is limited to the premium it paid for the default option. In contrast, if there is a default by the grantor of a default option, the Fund’s loss will include both the premium it paid for the option and the decline in value of the underlying security that the default option hedged. If the Fund “writes” (sells) protection, it may be liable for the entire value of the security underlying the derivative.

Combined Transactions. The Fund may enter into multiple transactions, including multiple options transactions, multiple futures transactions, multiple currency transactions including forward currency contracts and multiple interest rate transactions, swaps, structured notes, and any combination of futures, options, swaps, currency, and interest rate transactions (“component transactions”), instead of a single transaction, as part of a single or combined strategy when, in the opinion of Lord Abbett, it is in the best interests of the Fund to do so. A combined transaction will usually contain elements of risk that are present in each of its component transactions. Although combined transactions normally are entered into based on Lord Abbett’s judgment that the combined strategies will reduce risk or otherwise more effectively achieve the desired portfolio management goal, it is possible that the combination instead will increase such risks or hinder achievement of the portfolio management objective.

Commodities. Commodities include assets that have tangible properties, such as oil, metals, and agricultural products. Commodity-linked derivative instruments include, for example, commodity index-linked notes, swap agreements, commodity options, futures, and options on futures. These instruments provide exposure to the investment returns of the commodities markets, without investing directly in physical commodities. An investment in commodity-linked derivative instruments may subject the Fund to greater volatility than investments in traditional securities, particularly if the instruments involve leverage. The value of commodity linked derivative instruments may be affected by changes in overall market movements, commodity index volatility, changes in interest rates, or factors affecting a particular industry or commodity, such as drought, floods, weather, livestock disease, embargoes, tariffs, and international economic, political, and regulatory developments. Use of leveraged commodity-linked derivatives creates the possibility for greater loss (including the likelihood of greater volatility of the Fund’s net asset value (“NAV”)), and there can be no assurance that the Fund’s use of leverage will be successful. Tax considerations and position limits established by the commodities exchanges may limit the Fund’s ability to pursue investments in commodity-linked derivatives.

Options on Securities and Securities Indices. The Fund may purchase call and put options and write covered call and put option contracts. A call option gives the purchaser of the option the right to buy, and obligates the writer to sell, the underlying security or securities at the exercise price at any time during the option period or at a specific date depending on the terms of the option. Conversely, a put option gives the purchaser of the option the right to sell, and obligates the writer to buy, the underlying security or securities at the exercise price at any time during the option period or at a specific date depending on the terms of the option. The Fund also may enter into “closing purchase transactions” in order to terminate its obligation to deliver the underlying security. A closing purchase transaction is the purchase of a call option (at a cost that may be more or less than the premium received for writing the original call option) on the same security, with the same exercise price and call period as the option previously written. If the Fund is unable to enter into a closing purchase transaction, it may be required to hold a security that it otherwise might have sold to protect against depreciation. Certain “European” options only permit exercise on the exercise date. Options that are not exercised or closed out before their expiration date will expire worthless.

A “covered call option” written by the Fund is a call option with respect to which the Fund owns the underlying security. A put option written by the Fund is covered when, among other things, the Fund segregates permissible liquid assets having a value equal to or greater than the exercise price of the option to fulfill the obligation undertaken or otherwise covers the transaction. The principal reason for writing covered call and put options is to realize, through the receipt of premiums, a greater return than would be realized on the underlying securities alone. The Fund receives a premium from writing covered call or put options, which it retains whether or not the option is exercised. However, the Fund also may realize a loss on the transaction greater than the premium received.

There is no assurance that sufficient trading interest to create a liquid secondary market on a securities exchange will exist 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, at times have rendered certain of the clearing facilities inadequate and resulted in the institution of special procedures, such as trading rotations, restrictions on certain types of orders, trading halts, or suspensions in one or more options. Similar events, or events that may otherwise interfere with the timely execution of customers’ orders, may recur in the future. In such event, it might not be possible to effect closing transactions in particular options. 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 until the option

expires or it delivers the underlying security upon exercise, or it otherwise covers its position.

The securities exchanges generally have established limits on the maximum number of options an investor or group of investors acting in concert may write. The Fund, Lord Abbett, and other funds advised by Lord Abbett may constitute such a group. These limits could restrict the Fund’s ability to purchase or write options on a particular security.

Specific Options Transactions. Examples of the types of options the Fund may purchase and sell include call and put options in respect of specific securities (or groups or “baskets” of specific securities) such as U.S. Government securities, mortgage-related securities, asset-backed securities, foreign sovereign debt, corporate debt securities, equity securities (including convertible securities), and Eurodollar instruments that are traded on U.S. or foreign securities exchanges or in the OTC market, or securities indices, currencies, or futures.

An option on an index is similar to an option in respect of specific securities, except that settlement does not occur by delivery of the securities comprising the index. Instead, the option holder receives an amount of cash if the closing level of the index upon which the option is based is greater than in the case of a call, or less than in the case of a put, the exercise price of the option. Thus, the effectiveness of purchasing or writing index options will depend upon price movements in the level of the index rather than the price of a particular security.

The Fund may purchase and sell call and put options on foreign currencies. These options convey the right to buy or sell the underlying currency at a price that is expected to be lower or higher than the spot price of the currency at the time the option is exercised or expires. Successful use by the Fund of options and options on futures will be subject to Lord Abbett’s ability to predict correctly movements in the prices of individual securities, the relevant securities market generally, foreign currencies, or interest rates. To the extent Lord Abbett’s predictions are incorrect, the Fund may incur losses. The use of options also can increase the Fund’s transaction costs.

OTC Options. OTC options contracts (“OTC options”) differ from exchange-traded options in several respects. OTC options are transacted directly with dealers and not with a clearing corporation and there is a risk of nonperformance by the dealer as a result of the insolvency of the dealer or otherwise, in which event the Fund may experience material losses. Because there is no exchange, pricing normally is done by reference to information from the counterparty or other market participants.

In the case of OTC options, there can be no assurance that a liquid secondary market will exist for any particular option at any given time. Consequently, the Fund may be able to realize the value of an OTC option it has purchased only by exercising it or entering into a closing sale transaction with the dealer that issued it. Similarly, when the Fund writes an OTC option, generally it can close out that option before its expiration only by entering into a closing purchase transaction with the dealer to which the Fund originally wrote it. If a covered call option writer cannot effect a closing transaction, it cannot sell the underlying security until the option expires or the option is exercised. Therefore, a covered call option writer of an OTC option may not be able to sell an underlying security even though it otherwise might be advantageous to do so. Likewise, a put writer of an OTC option may be unable to sell the securities segregated to cover the put for other investment purposes while it is obligated as a put writer. Similarly, a purchaser of such put or call option also might find it difficult to terminate its position on a timely basis in the absence of a secondary market.

Foreign Currency Options. The Fund may take positions in options on foreign currencies. For example, if the Fund were to enter into a contract to purchase securities denominated in a foreign currency, it effectively could fix the maximum U.S. dollar cost of the securities by purchasing call options on that foreign currency. Similarly, if the Fund held securities denominated in a foreign

currency and anticipated a decline in the value of that currency against the U.S. dollar, it could hedge against such a decline by purchasing a put option on the currency involved. The Fund’s ability to establish and close out positions in such options is subject to the maintenance of a liquid secondary market. There can be no assurance that a liquid secondary market will exist for a particular option at any specific time. In addition, options on foreign currencies are affected by all of those factors that influence foreign exchange rates and investments generally. Option markets may be closed while non-U.S. securities markets or round-the-clock interbank currency markets are open, and this can create price and rate discrepancies.

The value of a foreign currency option depends on, among other factors, the value of the underlying currency, relative to the U.S. dollar. Other factors affecting the value of an option are the time remaining until expiration, the relationship of the exercise price to market price, the historical price volatility of the underlying currency and general market conditions. As a result, changes in the value of an option position may have no relationship to the investment merit of the foreign currency. Whether a profit or loss is realized on a closing transaction depends on the price movement of the underlying currency and the market value of the option.

There can be no assurance that the Fund will be able to liquidate an option at a favorable price at any time before expiration. In the event of insolvency of the counterparty, the Fund may be unable to liquidate a foreign currency option. Accordingly, it may not be possible to effect closing transactions with respect to certain options, with the result that the Fund would have to exercise those options that it had purchased in order to realize any profit.

Yield Curve Options. Options on the yield spread or differential between two securities are commonly referred to as “yield curve” options. In contrast to other types of options, a yield curve option is based on the difference between the yields of designated securities, rather than the prices of the individual securities, and is settled through cash payments. Accordingly, a yield curve option is profitable to the holder if this differential widens (in the case of a call) or narrows (in the case of a put), regardless of whether the yields of the underlying securities increase or decrease.

The trading of yield curve options is subject to all of the risks associated with the trading of other types of options. In addition, such options present a risk of loss even if the yield of one of the underlying securities remains constant, or if the spread moves in a direction or to an extent that was not anticipated.

Futures Contracts and Options on Futures Contracts. As discussed under “Cash Management Practices,” the Fund may buy and sell index futures contracts to manage cash. For example, the Fund may gain exposure to an index or to a basket of securities by entering into futures contracts rather than buying securities in a rising market.

In addition to investing in futures for cash management purposes, the Fund may engage in futures and options on futures transactions in accordance with its investment objective and policies, for example, to hedge risk or to efficiently gain desired investment exposure. Futures are standardized, exchange-traded contracts to buy or sell a specified quantity of an underlying reference instrument at a specified price at a specified future date. In most cases, the contractual obligation under a futures contract may be offset or “closed out” before the settlement date so that the parties do not have to make or take delivery. The Fund usually closes out a futures contract by buying or selling, as the case may be, an identical, offsetting futures contract. This transaction, which is effected through an exchange, cancels the obligation to make or take delivery of the underlying reference instrument. An option on a futures contract gives the purchaser the right (and the writer of the option the obligation) to assume a position in a futures contract at a specified exercise price within a specified period of time. In the United States, a clearing organization associated with the exchange on which futures are traded assumes responsibility for closing out transactions and guarantees that, as between the clearing members of an exchange, the sale and purchase obligations will be performed

with regard to all positions that remain open at the termination of the contract. Thus, each holder of such a futures contract bears the credit risk of the clearinghouse (and has the benefit of its financial strength) rather than that of a particular counterparty.

When the Fund enters into a futures contract or writes an option, it generally must deposit collateral or “initial margin” equal to a percentage of the contract value. Each day thereafter until the futures contract or option is closed out, matures, or expires, the Fund will pay or receive additional “variation margin” depending on, among other factors, changes in the price of the underlying reference instrument. When the futures contract is closed out, if the Fund experiences a loss equal to or greater than the margin amount, the Fund will pay the margin amount plus any amount in excess of the margin amount. If the Fund experiences a loss of less than the margin amount, the Fund receives the difference. Likewise, if the Fund experiences a gain, the Fund receives the margin amount and any gain in excess of the margin amount.

Although some futures contracts call for making or taking delivery of the underlying securities, commodities, or other assets, generally these obligations are closed out before delivery by offsetting purchases or sales of matching futures contracts (same exchange, delivery month, and underlying security, asset, or index). Certain futures contracts may permit cash settlement. If an offsetting purchase price is less than the original sale price, the Fund realizes a gain, or if it is more, the Fund realizes a loss. Conversely, if an offsetting sale price is more than the original purchase price, the Fund realizes a gain, or if it is less, the Fund realizes a loss. The Fund will also incur transaction costs.

The Fund may enter into futures contracts in U.S. domestic markets or on exchanges located outside the United States. Foreign markets may offer advantages such as trading opportunities or arbitrage possibilities not available in the United States. Foreign markets, however, may have greater risk potential than domestic markets. For example, some foreign exchanges are principal markets so that no common clearing facility exists and an investor may look only to the broker for performance of the contract. In addition, adverse changes in the currency exchange rate could eliminate any profits that the Fund might realize in trading and could cause the Fund to incur losses.

Futures contracts and options on futures contracts present substantial risks, including the following:

Index and Interest Rate Futures Transactions. An index future obligates the Fund to pay or receive an amount of cash equal to a fixed dollar amount specified in the futures contract multiplied by the difference between the settlement price of the contract on the contract’s last trading day and the value of the index based on the prices of the securities that comprise the index at the opening of trading in such securities on the next business day.

The market value of a stock index futures contract is based primarily on the value of the underlying index. Changes in the value of the index will cause roughly corresponding changes in the market price of the futures contract. If a stock index is established that is made up of securities whose market characteristics closely parallel the market characteristics of the securities in the Fund’s portfolio, then the market value of a futures contract on that index should fluctuate in a way closely resembling the market fluctuation of the portfolio. Thus, for example, if the Fund sells futures contracts, a decline in the market value of the portfolio will be offset by an increase in the value of the short futures position to the extent of the hedge ( i.e. , the size of the futures position). However, if the market value of the portfolio were to increase, the Fund would lose money on the futures contracts. Stock index futures contracts are subject to the same risks as other futures contracts.

An interest rate future generally obligates the Fund to purchase or sell an amount of a specific debt security. Such purchase or sale will take place at a future date at a specific price established by the terms of the futures contract.

Structured Securities and Other Hybrid Instruments. Structured securities and other hybrid instruments are types of derivative securities whose value is determined by reference to changes in the value of specific securities, currencies, interest rates, commodities, indices, or other financial indicators (the “Reference Instrument”), or the relative change in two or more Reference Instruments. The interest rate or the principal amount payable upon maturity or redemption may be increased or decreased depending upon changes in the applicable Reference Instrument. Structured securities may be positively or negatively indexed, so the appreciation of the Reference Instrument may produce an increase or decrease in the interest rate or value of the security at maturity. Structured securities may present additional risks that are different from those associated with a direct investment in fixed income or equity securities; they may be more volatile, less liquid, and more difficult to price accurately and subject to additional credit risks. To the extent that it invests in structured securities, the Fund could lose more than the principal amount invested.

Structured securities and other hybrid instruments can be used as an efficient means of pursuing a variety of investment strategies, including currency hedging, duration management, and increased total return. These instruments may not bear interest or pay dividends. As with other derivatives, the value of a hybrid instrument may be a multiple of a Reference Instrument and, as a result, may be leveraged and move (up or down) more steeply and rapidly than the Reference Instrument. These Reference Instruments may be sensitive to economic and political events, such as commodity shortages and currency devaluations, which cannot be readily foreseen by the purchaser of a hybrid. Under certain conditions, the redemption value of a hybrid could be zero. Thus, an investment in a hybrid may entail significant market risks that are not associated with a similar investment in a traditional stock or bond. The purchase of hybrids also exposes the Fund to the credit risk of the issuer of the hybrids. These risks may cause significant fluctuations in the NAV of the Fund.

Participation Notes. Participation notes (“P-notes”), which are a type of structured security, are instruments that may be used by the Fund to provide exposure to equity or debt securities, currencies, or markets. P-notes are typically used when a direct investment in the underlying security is either unpermitted or restricted due to country-specific regulations or other restrictions. Generally, local banks and broker-dealers associated with non-U.S.-based brokerage firms buy securities listed on certain foreign exchanges and then issue P-notes which are designed to replicate

the performance of certain issuers and markets. The performance results of P-notes will not replicate exactly the performance of the issuers or markets that the notes seek to replicate due to transaction costs and other expenses. P-notes are similar to depositary receipts except that: (1) broker-dealers, not U.S. banks, are depositories for the securities; and (2) noteholders may remain anonymous to market regulators.

The price, performance, and liquidity of the P-note are all linked directly to the underlying securities. If a P-note were held to maturity, the issuer would pay to, or receive from, the purchaser the difference between the nominal value of the underlying instrument at the time of purchase and that instrument’s value at maturity. The holder of a P-note that is linked to a particular underlying security or instrument may be entitled to receive any dividends paid in connection with that underlying security or instrument, but typically does not receive voting rights as it would if it directly owned the underlying security or instrument. P-notes involve transaction costs. Investments in P-notes involve the same risks associated with a direct investment in the underlying security or instrument that they seek to replicate. The foreign investments risk associated with P-notes is similar to those of investing in depositary receipts. However, unlike depositary receipts, P-notes are subject to counterparty risk based on the uncertainty of the counterparty’s (i.e., the broker’s) ability to meet its obligations.

In addition to providing access to otherwise closed or restricted markets, P-notes also can provide a less expensive option to direct investment, where ownership by foreign investors is permitted, by reducing registration and transaction costs in acquiring and selling local registered shares. P-notes can offer greater liquidity in markets that restrict the ability of the Fund to dispose of an investment by either restricting transactions by size or requiring registration and/or regulatory approvals.

Additionally, while P-notes may be listed on an exchange, there is no guarantee that a liquid market will exist or that the counterparty or issuer of a P-note will be willing to repurchase such instrument when the Fund wishes to sell it. Therefore, the Fund may be exposed to the risks of mispricing or improper valuation.

Swaps. The Fund may enter into interest rate, equity index, credit default, currency, Consumer Price Index (“CPI”), total return, municipal default, and other types of swap agreements. The Fund may also enter into swaptions (options on swaps). A swap transaction involves an agreement between two parties to exchange different types of cash flows based on a specified or “notional” amount. The cash flows exchanged in a specific transaction may be, among other things, payments that are the equivalent of interest on a principal amount, payments that would compensate the purchaser for losses on a defaulted security or basket of securities, or payments reflecting the performance of one or more specified securities, currencies, or indices. The Fund may enter into OTC swap transactions and may also enter into swaps that are traded on exchanges and are subject to central clearing. OTC swaps are subject to the credit risk of the counterparty, as well as the risks associated with the swap itself.

Specific Types of Swaps. In an interest rate swap, the Fund may agree to either make or receive payments that are equivalent to a fixed rate of interest on the specified notional amount in exchange for payments that are equivalent to a variable rate of interest (based on a specified index) on the same notional amount. Interest rate swaps may enable the Fund to either increase or reduce its interest rate risk or adjust the duration of its bond portfolio.

In a credit default swap, one party agrees to make one or more premium payments in exchange for the agreement of its counterparty to pay an amount equal to the decrease in value of a specified bond or a basket of debt securities upon the occurrence of a default or other “credit event” relating to the issuers of the specified bond or debt. In such transactions, the first party effectively acquires protection from default by the issuer. The Fund also may be the protection buyer or seller in a

credit default swap.

Currency swaps involve the exchange of cash flows on a notional amount of two or more currencies based on their relative future values.

A CPI swap is a contract in which one party agrees to pay a fixed rate in exchange for a variable rate, which is the rate of change in the CPI during the life of the contract. Payments generally are based on a notional amount of principal. Some CPI swaps are on a zero coupon basis, meaning that the floating rate will be based on the cumulative CPI during the life of the contract, and the fixed rate will compound until the swap’s maturity date, at which point the payments are netted. The Fund also may enter into CPI swaps on a year-over-year basis, in which one party pays an annual fixed rate on some notional amount at specified intervals ( e.g. , monthly, annually, etc.), while the other party pays the annual year-over-year inflation rate at specified intervals.

In a total return swap, the Fund may agree to make payments in exchange for the right to receive payments equivalent to any appreciation in the value of an underlying security, index, or other asset, as well as payments equivalent to any distributions made on that asset, over the term of the swap. If the value of the asset underlying a total return swap declines over the term of the swap, the Fund also may be required to pay an amount equal to that decline in value to its counterparty. The Fund also may be the seller of a total return swap, in which case it would receive premium payments and an amount equal to any decline in value of the underlying asset over the term of the swap, but it would be obligated to pay its counterparty an amount equal to any appreciation.

In a municipal default swap, the Fund agrees to make one or more premium payments in exchange for the agreement of its counterparty to pay an amount equal to the decrease in value of a specified bond or a basket of debt securities upon the occurrence of a default or other “credit event” relating to the issuers of the debt. In such transactions, the Fund effectively acquires protection from the municipal default swap counterparty from decreases in the creditworthiness of the debt issuers. In addition to investing in municipal default swaps, the Fund also may invest in an index whose underlying (or reference) assets are municipal default swaps.

The Fund also may purchase and write options contracts on swaps, commonly known as “swaptions.” A swaption is an option to enter into a swap agreement. As with other types of options, 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 receives the premium in exchange for the obligation to enter into the agreed upon underlying swap if the option is exercised.

The Fund also may purchase or sell interest rate caps, floors, and collars. The purchaser of an interest rate cap is entitled to receive payments only to the extent that a specified index exceeds a predetermined interest rate. The purchaser of an interest floor is entitled to receive payments only to the extent that a specified index is below a predetermined interest rate. A collar effectively combines a cap and a floor so that the purchaser receives payments only when market interest rates are within a specified range of interest rates.

Additional Risks Associated with Swaps. The use of swaps is a highly specialized activity that involves investment techniques and risks that are different from those associated with ordinary portfolio securities transactions. If Lord Abbett is incorrect in its forecasts of the interest rates, currency exchange rates, or market values, or its assessments of the credit risks, the investment performance of the Fund may be less favorable than it would have been if the Fund had not entered into them. Because many of these arrangements are bilateral agreements between the Fund and its counterparty, each party is exposed to the risk of default by the other. In addition, they may involve a small investment of cash compared to the risk assumed with the result that small changes may produce disproportionate and substantial gains or losses to the Fund. The Fund’s obligations under

swap agreements generally are collateralized by cash or government securities based on the amount by which the value of the payments that the Fund is required to make exceeds the value of the payments that its counterparty is required to make. Conversely, the Fund requires its counterparties to provide collateral on a comparable basis, except in those instances in which Lord Abbett is satisfied with the claims-paying ability of the counterparty without such collateral.

Future Developments. The Fund may take advantage of opportunities in options, futures contracts, options on futures contracts, and any other derivatives, including derivatives that are not presently contemplated for use by the Fund and derivatives that are not currently available but that may be developed, to the extent such opportunities are both consistent with the Fund’s investment objective and legally permissible for the Fund.

Equity Securities . Equity securities generally represent equity or ownership interests in an issuer. These include common stocks, preferred stocks, convertible preferred stocks, warrants, and similar instruments. The value of equity securities fluctuates based on changes in a company’s financial condition, and on market, economic, and political conditions, as well as changes in inflation and consumer demand.

Common Stocks. Common stocks represent an ownership interest in a company. The prices of common stocks generally fluctuate more than the prices of other securities and reflect changes in, among other things, a company’s financial condition and in overall market, economic, and political conditions, changes in inflation, and consumer demand. A company’s common stock generally is a riskier investment than its fixed income securities, and it is possible that the Fund may experience a substantial or complete loss on an individual equity investment.

Preferred Stocks. Preferred stocks are securities that evidence ownership in a corporation and pay a fixed or variable stream of dividends. These stocks represent an ownership interest and provide the holder with claims on the issuer’s earnings and assets, which generally come before common stockholders but after bond holders and other creditors. The obligations of an issuer of preferred stock, including dividend and other payment obligations, typically may not be accelerated by the holders of such preferred stock on the occurrence of an event of default or other non-compliance by the issuer. Investments in preferred stock are also subject to market and liquidity risks. The value of a preferred stock may be highly sensitive to the economic condition of the issuer, and markets for preferred stock may be less liquid than the market for the issuer’s common stock.

Warrants and Rights. Warrants and rights are types of securities that give a holder a right to purchase shares of common stock. Warrants are options to buy from the issuer a stated number of shares of common stock at a specified price, usually higher than the market price at the time of issuance, until a stated expiration date. Rights represent a privilege offered to holders of record of issued securities to subscribe (usually on a pro rata basis) for additional securities of the same class, of a different class or of a different issuer, usually at a price below the initial offering price of the common stock and before the common stock is offered to the general public. The holders of warrants and rights have no voting rights, receive no dividends and have no rights with respect to the assets of the issuer. Warrants and rights may be transferable. The value of a warrant or right may not necessarily change with the value of the underlying securities. The risk of investing in a warrant or a right is that the warrant or the right may expire before the market value of the common stock exceeds the price specified by the warrant or the right. If not exercised before their stated expiration date, warrants and rights cease to have value and may result in a total loss of the money invested. Investments in warrants and rights are considered speculative.

Foreign Currency Transactions . The Fund may enter into foreign currency transactions for a variety of purposes, including: to fix in U.S. dollars, between trade and settlement date, the value

of a security the Fund has agreed to buy or sell; to hedge the U.S. dollar value of securities the Fund already owns, particularly if it expects a decrease in the value of the currency in which the foreign security is denominated; or to gain or reduce exposure to the foreign currency for investment purposes.

The Fund also may invest directly in foreign currencies or hold financial instruments that provide exposure to foreign currencies or may invest in securities that trade in, or receive revenues in, foreign currencies. To the extent the Fund invests in such currencies, it will be subject to the risk that those currencies will decline in value relative to the U.S. dollar. Foreign currency exchange rates may fluctuate significantly over short periods of time. Fund assets that are denominated in foreign currencies may be devalued against the U.S. dollar, resulting in a loss. A U.S. dollar investment in depositary receipts or shares of foreign issuers traded on U.S. exchanges may be impacted differently by currency fluctuations than would an investment made in a foreign currency on a foreign exchange in shares of the same issuer. Foreign currencies also are subject to the risks described under “Foreign Currency Risk” in the Fund’s prospectus, such as inflation, interest and taxation rates, budget deficits and low savings rates, political factors, and government control.

The Fund may engage in “spot” (cash or currency) transactions and also may use forward contracts. A forward contract on foreign currencies involves obligations of one party to purchase, and another party to sell, a specific currency at a future date (which may be any fixed number of days from the date of the contract agreed upon by the parties), at a price set at the time the contract is entered into. These contracts typically are traded in the OTC derivatives market and entered into directly between financial institutions or other currency traders and their customers.

The Fund may enter into forward contracts with respect to specific transactions. For example, when the Fund enters into a contract for the purchase or sale of a security denominated in a foreign currency, or when the Fund anticipates the receipt in a foreign currency of dividend or interest payments on a security that it holds, the Fund may desire to “lock in” the U.S. dollar price of the security or the U.S. dollar equivalent of the payment, by entering into a forward contract for the purchase or sale, for a fixed amount of U.S. dollars or foreign currency, of the amount of foreign currency involved in the underlying transaction. If the transaction went as planned, the Fund would be able 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.

The Fund also may use forward contracts in connection with existing portfolio positions to lock in the U.S. dollar value of those positions, to increase the Fund’s exposure to foreign currencies that Lord Abbett believes may rise in value relative to the U.S. dollar, or to shift the Fund’s exposure to foreign currency fluctuations from one country to another. For example, when Lord Abbett believes that the currency of a particular foreign country may suffer a substantial decline relative to the U.S. dollar or another currency, it may enter into a forward contract to sell the former foreign currency. This investment practice generally is referred to as “cross-hedging” if two non-U.S. currencies are used. However, the Fund’s foreign currency transactions are not limited to transactions that involve a sale or purchase of a security.

The precise matching of the forward contract amounts and the value of the securities involved generally will not be possible because the future value of such securities in foreign currencies will change as a consequence of market movements in the value of those securities between the date the forward contract is entered into and the date it matures. Accordingly, it may be necessary for the Fund to purchase additional foreign currency on the spot market (and bear the expense of such purchase) if the market value of the security is less than the amount of foreign currency the Fund is obligated to deliver and if a decision is made to sell the security and make delivery of the foreign currency. Conversely, it may be necessary to sell on the spot market some of the foreign currency

received upon the sale of the portfolio security if its market value exceeds the amount of foreign currency the Fund is obligated to deliver. The projection of short-term currency market movements is extremely difficult, and the successful execution of a short-term hedging strategy is highly uncertain. Forward contracts involve the risk that anticipated currency movements may not be accurately predicted, causing the Fund to sustain losses on these contracts and transaction costs.

At or before the maturity date of a forward contract that requires the Fund to sell a currency, the Fund may either sell a portfolio security and use the sale proceeds to make delivery of the currency or retain the security and offset its contractual obligation to deliver the currency by purchasing a second contract pursuant to which the Fund will obtain, on the same maturity date, the same amount of the currency that it is obligated to deliver. Similarly, the Fund may close out a forward contract requiring it to purchase a specified currency by entering into a second contract entitling it to sell the same amount of the same currency on the maturity date of the first contract. The Fund would realize a gain or loss as a result of entering into such an offsetting forward contract under either circumstance to the extent the exchange rate between the currencies involved moved between the execution dates of the first and second contracts. On the delivery date, a forward contract can be settled by physical delivery.

There is no systematic reporting of last sale information for foreign currencies or any regulatory requirement that quotations be firm or revised on a timely basis. Quotation information generally is representative of very large transactions in the interbank market and may not reflect smaller transactions where rates may be less favorable.

Types of Forward Contracts. The Fund also may enter into currency forward contracts that are contractually required to, or may, settle in cash, including non-deliverable currency forward contracts (“NDFs”). Cash-settled currency forward contracts, including NDFs, generally require the netting of the parties’ liabilities. Under a cash- settled forward contract that requires netting, the Fund or its counterparty to the contract is required only to deliver a cash payment in the amount of its net obligation in settlement of the contract. Forward contracts are marked-to-market on a daily basis, and the Fund may be required to post collateral to a counterparty pursuant to the terms of a forward contract if the Fund has a net obligation under the contract. Likewise, the Fund may be entitled to receive collateral under the terms of a forward contract if the counterparty has a net obligation under the contract. A forward contract generally requires the delivery of initial margin by the Fund. Currency forward contracts, including NDFs, typically have maturities of approximately one to three months but may have maturities of up to six months or more.

The cost to the Fund of engaging in forward contracts varies with factors such as the currencies involved, the length of the contract period, and the market conditions then prevailing. The use of forward contracts does not eliminate fluctuations in the prices of the underlying securities the Fund owns or intends to acquire, but it does fix a rate of exchange in advance. In addition, although forward contracts limit the risk of loss due to a decline in the value of the hedged currencies, at the same time they limit any potential gain that might result should the value of the currencies increase.

Foreign Securities . Investment in foreign securities may involve special risks that typically are not associated with investments in U.S. securities. Foreign investment risks may be greater in developing and emerging markets than in developed markets. The risks associated with foreign securities include, among other things, the following:

exchange rates may fluctuate significantly over short periods of time, for a number of reasons.

Markets and economies throughout the world are becoming increasingly interconnected, and conditions or events in one market, country or region may adversely impact investments or issues in another market, country or region. Many countries throughout the world are dependent on a healthy U.S. economy and are adversely affected when the U.S. economy weakens or its markets decline. Additionally, many foreign country economies are heavily dependent on international trade and are adversely affected by protective trade barriers and economic conditions of their trading partners. In addition, voters in the United Kingdom recently voted to leave the European Union (“EU”), creating economic and political uncertainty with respect to, among other things, the timing of the UK’s withdrawal from the EU and the effects such withdrawal will have on the Euro, European economies, and the global markets.

Emerging Markets. The risks described above apply to an even greater extent to investments in emerging markets, which may be considered speculative. Emerging markets may develop unevenly or may never fully develop and are more likely to experience hyperinflation and currency devaluations, which may be sudden and significant. In addition, the securities and currencies of many of emerging market countries may have far lower trading volumes and less liquidity than those of developed nations. If the Fund’s investments need to be liquidated quickly, the Fund could sustain significant transaction costs.

Securities and issuers in emerging countries tend to be subject to less extensive and frequent accounting, financial, and other reporting requirements than securities and issuers in more developed countries. Government enforcement of existing securities regulations is limited, and any such enforcement may be arbitrary and the results may be difficult to predict. Further, investing in

securities of issuers located in certain emerging market countries may present a greater risk of loss resulting from problems in security registration and custody.

Many emerging market countries have histories of political instability and abrupt changes in policies. As a result, their governments may be more likely to take actions that are hostile or detrimental to foreign investment than those of more developed countries, such as expropriation, confiscatory taxation, and nationalization of assets and securities. Certain emerging market countries also may face other significant internal or external risks, including a heightened risk of war, and ethnic, religious, and racial conflicts, and the imposition of economic sanctions or other measures by the United States or other governments. The economies of emerging countries may be predominantly based on only a few industries or dependent on revenues from particular commodities. In addition, governments in many emerging market countries participate to a significant degree in their economies and securities markets, which may impair investment and economic growth, and which may, in turn, diminish the value of their currencies. If a company’s economic fortunes are linked to emerging markets, then a security it issues generally will be subject to these risks even if the security is principally traded on a non-emerging market exchange.

High-Yield or Lower-Rated Debt Securities. Debt securities are typically considered “non-investment grade” (also referred to as “high-yield debt securities,” “lower-rated debt securities,” or “junk bonds”) if they are rated Ba1 or lower by Moody’s and BB+ or lower by S&P or Fitch or instruments comparably rated by other rating agencies, or in unrated instruments determined by Lord Abbett to be of comparable quality. At any given time and from time to time substantially all of the Fund’s portfolio may consist of high yield (or below investment grade) debt securities. Non-investment grade debt securities may pay a higher yield, but entail greater risks, than investment grade debt securities, and are considered speculative. When compared to investment grade debt securities, high-yield debt securities:

The risk of loss from default for the holders of high-yield debt securities is significantly greater than is the case for holders of other debt securities because such high-yield securities generally are unsecured, often are subordinated to the rights of other creditors of the issuers of such securities, and are issued by issuers with weaker financials.

An economic downturn could severely affect the ability of highly leveraged issuers of junk bond investments to service their debt obligations or to repay their obligations upon maturity. If an issuer of high-yield securities in which the Fund is invested defaults, the Fund may incur additional expenses to seek recovery. Investment by the Fund in already defaulted securities poses an additional risk of loss should nonpayment of principal and interest continue for such securities. Even if such securities are held to maturity, the Fund’s recovery of its initial investment and any anticipated income or appreciation is uncertain. The Fund may be required to liquidate other portfolio securities to satisfy annual distribution obligations of the Fund in respect of accrued interest income on securities that are subsequently written off, even though the Fund has not received any cash payments of such interest.

Because the risk of default is higher among high-yield debt securities, Lord Abbett’s research and analysis are important factors in the selection of such securities. Through portfolio diversification,

good credit analysis, and attention to current developments and trends in interest rates and economic conditions, the Fund seeks to reduce this risk. There can be no assurance, however, that this risk will, in fact, be reduced and that losses will not occur.

The secondary market for high-yield debt securities is not as liquid as, and is more volatile than, the secondary market for higher rated securities. In addition, market trading volume for lower-rated securities generally is lower and the secondary market for such securities could shrink or disappear suddenly and without warning as a result of adverse market or economic conditions, independent of any specific adverse changes in the condition of a particular issuer. Because of the lack of sufficient market liquidity, the Fund may incur losses because it may be required to effect sales at a disadvantageous time and then only at a substantial drop in price. These factors may have an adverse effect on the market price and the Fund’s ability to dispose of particular portfolio investments when needed for repurchase obligations or other liquidity needs. A less liquid secondary market also may make it more difficult for the Fund to obtain precise valuations of lower-rated securities in its portfolio. Legislative and regulatory developments such as those discussed under “Debt Securities” above have adversely affected the secondary market for high-yield debt securities and the financial condition of issuers of these securities.

High-yield debt securities also present risks based on payment expectations. High-yield debt securities frequently contain “call” or buy-back features that permit the issuer to call or repurchase the security from its holder. If an issuer exercises such a “call option” and redeems the security, the Fund may have to replace such security with a lower yielding security, resulting in a decreased return for investors.

Factors having an adverse impact on the market value of high-yield securities will have an adverse effect on the Fund’s NAV to the extent the Fund holds such investments. In addition, in order to satisfy repurchase obligations, the Fund may be forced to sell its higher rated securities, resulting in a decline in the overall credit quality of its portfolio and increasing its exposure to the risks of high-yield securities.

Illiquid Securities . An illiquid security is a security that the Fund reasonably expects cannot be sold or disposed of in then-current market conditions in seven calendar days or less without the sale or disposition significantly changing the market value of the security. Illiquid securities include, but are not limited to:

The purchase price and subsequent valuation of restricted and illiquid securities normally reflect a discount, which may be significant, from the market price of comparable securities for which a liquid market exists. The amount of the discount from the prevailing market price varies depending upon the type of security, the character of the issuer, the party who will bear the expenses of registering the restricted securities (if needed), and prevailing supply and demand conditions.

The Fund may not be able to readily liquidate its investment in illiquid securities and may have to sell other investments if necessary to raise cash to meet its obligations. In this event, illiquid securities would become an increasingly larger percentage of the Fund’s portfolio. The lack of a liquid secondary market for illiquid securities may make it more difficult for the Fund to assign a value to those securities for purposes of valuing its portfolio and calculating its NAV.

144A Securities. The Fund also may invest in illiquid securities that are governed by Rule 144A under the 1933 Act. These securities may be resold under certain circumstances to other institutional buyers. Specifically, 144A Securities may be resold to a qualified institutional buyer (“QIB”) without registration and without regard to whether the seller originally purchased the security for investment. Investing in 144A Securities may decrease the liquidity of the Fund’s portfolio to the extent that QIBs become, for a time, uninterested in purchasing these securities. 144A Securities may be treated as liquid under procedures approved by the Board of the Fund. Because of the resale restrictions in 144A Securities, there is a greater risk that they will become illiquid than securities registered with the SEC.

Inflation-Indexed Securities . Inflation-indexed securities are fixed income securities whose principal value is periodically adjusted according to the rate of inflation. Two structures are common. The U.S. Treasury and some other issuers use a structure that accrues inflation into the principal value of the bond. Many other issuers pay out the CPI accruals as part of a semiannual coupon.

Inflation-indexed securities issued by the U.S. Treasury (“TIPS”) have maturities of five, ten, or thirty years, although it is possible that securities with other maturities will be issued in the future. TIPS pay interest on a semiannual basis, equal to a fixed percentage of the inflation-adjusted principal amount. For example, if the Fund purchased an inflation-indexed bond with a par value of $1,000 and a 3% real rate of return coupon (payable 1.5% semiannually), and inflation over the first six months was 1%, the mid-year par value of the bond would be $1,010 and the first semiannual interest payment would be $15.15 ($1,010 times 1.5%). If inflation during the second half of the year resulted in the whole year’s inflation equaling 3%, the end-of-year par value of the bond would be $1,030 and the second semiannual interest payment would be $15.45 ($1,030 times 1.5%).

If the periodic adjustment rate measuring inflation falls, the principal value of the inflation-indexed bonds will be adjusted downward, and, consequently, the interest payable on these securities (calculated with respect to a smaller principal amount) will be reduced. At maturity, TIPS are redeemed at the greater of their inflation- adjusted principal and the par amount at original issue. If an inflation-indexed bond does not provide a guarantee of principal at maturity, the adjusted principal amount of the bond repaid at maturity may be less than the original principal amount. Other types of inflation-indexed bonds may be adjusted in response to changes in the rate of inflation by different mechanisms (such as by changes in the rates of interest paid on their principal amounts).

The values of inflation-indexed bonds are expected to change in response to changes in real interest rates, which are tied to the relationship between nominal interest rates and the rate of inflation. For example, if inflation were to rise at a faster rate than nominal interest rates, real interest rates would likely decline, leading to an increase in value of inflation-indexed bonds. In contrast, if nominal interest rates increase at a faster rate than inflation, real interest rates would likely rise, leading to a decrease in value of inflation-indexed bonds.

While these securities, if held to maturity, are expected to be protected to some extent from long-term inflationary trends, short-term increases in inflation may lead to a decline in value. If nominal interest rates rise due to reasons other than inflation (for example, due to changes in currency exchange rates or an expansion of non-inflationary economic activity), investors in these securities may not be protected to the extent that the increase is not reflected in the

bond’s inflation measure.

The periodic inflation adjustment of U.S. inflation-indexed bonds is tied to the Consumer Price Index for Urban Consumers (“CPI-U”), which is calculated monthly by the U.S. Bureau of Labor Statistics. The CPI-U is a measurement of price changes in the cost of living, made up of components such as housing, food, transportation, and energy. Inflation-indexed bonds issued by a foreign government generally are adjusted to reflect a comparable inflation index, calculated by that government. There can be no assurance that the CPI-U or any foreign inflation index will accurately measure the real rate of inflation in the prices of goods and services. Moreover, there can be no assurance that the rate of inflation in a foreign country will be correlated to the rate of inflation in the United States. Any increase in the principal amount of an inflation-indexed bond will be considered taxable ordinary income, even though investors do not receive their principal until maturity.

Initial Public Offerings (“IPOs”) . IPOs are new issues of equity and fixed income securities. IPOs have many of the same risks as small company stocks and bonds. IPOs do not have trading history, and information about the company may be available only for recent periods. The Fund’s purchase of shares or bonds issued in IPOs also exposes it to the risks inherent in those sectors of the market where these new issuers operate. The market for IPO issuers has been volatile and share and bond prices of newly priced companies have fluctuated in significant amounts over short periods of time. The Fund may be limited in the quantity of IPO and secondary offering shares and bonds that it may buy at the offering price, or the Fund may be unable to buy any shares or bonds of an IPO or secondary offering at the offering price. The Fund’s investment return earned during a period of substantial investment in IPOs may not be sustained during other periods when the Fund makes more limited, or no, investments in IPOs. As the size of the Fund increases, the impact of IPOs on the Fund’s performance generally would decrease; conversely, as the size of the Fund decreases, the impact of IPOs on the Fund’s performance generally would increase.

Investments in Other Investment Companie s. Subject to the limitations prescribed by the 1940 Act, the Fund may invest in other investment companies, including, but not limited to, money market funds, ETFs, closed-end funds, and other pooled vehicles. These limitations prohibit the Fund from acquiring more than 3% of the voting shares of any one other investment company, and prohibit the Fund investing more than 5% of its total assets in the securities of any one other investment company or more than 10% of its total assets in securities of other investment companies in the aggregate. The percentage limitations above apply to investments in any investment company. (However, pursuant to certain SEC rules, these percentage limitations do not apply to the Fund’s investments in certain registered money market funds.) The Fund’s investments in another investment company will be subject to the risks of the purchased investment company’s portfolio securities. The Fund’s shareholders must bear not only their proportionate share of the Fund’s fees and expenses, but they also must bear indirectly the fees and expenses of the other investment company.

ETFs. ETFs are investment companies whose shares are listed on a securities exchange and trade like a stock throughout the day. Certain ETFs use a “passive” investment strategy and will not attempt to take defensive positions in volatile or declining markets. Other ETFs are actively managed ( i.e. , they do not seek to replicate the performance of a particular index). Investments in ETFs are subject to a variety of risks, including risks of a direct investment in the underlying securities that the ETF holds. For example, the general level of stock prices may decline, thereby adversely affecting the value of the underlying common stock investments of the ETF and, consequently, the value of the ETF. Moreover, the market value of the ETF may differ from the value of its portfolio holdings because the market for ETF shares and the market for underlying securities are not always identical. Also, ETFs that track particular indices typically will be unable to match the performance of the index exactly due to the ETF’s operating expenses and transaction costs, among other things. Similar to investments in other investment companies, the Fund’s

shareholders must bear not only their proportionate share of the Fund’s fees and expenses, but they also must bear indirectly the fees and expenses of the ETF.

Other Risks. The Fund may invest in foreign countries through investment companies, including closed-end funds. Some emerging market countries have laws and regulations that currently preclude direct foreign investments in the securities of their companies. However, indirect foreign investment in the securities of such countries is permitted through investment companies that have been specifically authorized to make such foreign investments. These investments are subject to the risks of investing in foreign (including emerging market) securities.

Because closed-end funds do not issue redeemable securities and, thus, do not need to maintain liquidity to meet daily shareholder redemptions, such funds may invest in less liquid portfolio securities. Moreover, the Fund’s investment in a closed-end fund is exposed to the risk that a secondary market for such shares may cease to exist. Accordingly, the Fund’s investment in closed-end fund shares is subject to increased liquidity risk.

Leverage . The Fund may opportunistically add leverage to its portfolio by utilizing instruments such as reverse repurchase agreements, credit default swaps, dollar rolls or borrowings, such as through bank loans or commercial paper and/or other credit facilities. The Fund may also enter into transactions other than those noted above that may give rise to a form of leverage including, among others, futures and forward contracts (including foreign currency exchange contracts), total return swaps and other derivative transactions, loans of portfolio securities, short sales and when-issued, delayed delivery and forward commitment transactions. Although it has no current intention to do so, the Fund may also determine to issue preferred shares or other types of senior securities to add leverage to its portfolio.

The net proceeds the Fund obtains from credit default swaps, reverse repurchase agreements, dollar rolls or other forms of leverage utilized will be invested in accordance with the Fund’s investment objective and policies as described in this prospectus. The 1940 Act generally prohibits the Fund from engaging in most forms of leverage (including the use of reverse repurchase agreements, dollar rolls, bank loans, commercial paper or other credit facilities, credit default swaps, total return swaps and other derivative transactions, loans of portfolio securities, short sales and when-issued, delayed delivery and forward commitment transactions, to the extent that these instruments are not covered as described below) unless immediately after the issuance of the leverage the Fund has satisfied the asset coverage test with respect to senior securities representing indebtedness prescribed by the 1940 Act; that is, the value of the Fund’s total assets less all liabilities and indebtedness not represented by senior securities (for these purposes, “total net assets”) is at least 300% of the senior securities representing indebtedness (effectively limiting the use of leverage through senior securities representing indebtedness to 33⅓% of the Fund’s total net assets, including assets attributable to such leverage). In addition, the Fund is not permitted to declare any cash dividend or other distribution on Shares unless, at the time of such declaration, this asset coverage test is satisfied.

The Fund may (but is not required to) cover its commitments under reverse repurchase agreements, dollar rolls, derivatives and certain other instruments by the segregation of liquid assets, or by entering into offsetting transactions or owning positions covering its obligations. To the extent that the Fund maintains segregated assets or otherwise covers certain of these instruments, they will not be considered “senior securities” under the 1940 Act and therefore will not be subject to the 1940 Act 300% asset coverage requirement otherwise applicable to forms of leverage used by the Fund. However, reverse repurchase agreements, dollar rolls and other such instruments, even if covered, may represent a form of economic leverage and create special risks. The use of these forms of leverage may increase the volatility of the Fund’s investment portfolio and could result in larger losses to shareholders than if these strategies were not used. To the extent that the Fund engages in borrowings, it may prepay a portion of the principal amount of the borrowing to the extent necessary in order to maintain the required asset coverage. Failure

to maintain certain asset coverage requirements could result in an event of default under the agreement governing a leverage facility.

Leveraging is a speculative technique and there are special risks and costs involved. There is no assurance that the Fund will utilize credit default swaps, reverse repurchase agreements, dollar rolls or borrowings, issue preferred shares or utilize any other forms of leverage (such as the use of derivatives strategies). If used, there can be no assurance that the Fund’s leveraging strategies will be successful or result in a higher yield on your Shares. When leverage is used, the net asset value of the Shares and the yield to shareholders will be more volatile. In addition, interest and other expenses borne by the Fund with respect to its use of reverse repurchase agreements, dollar rolls, borrowings or any other forms of leverage are borne by the shareholders and result in a reduction of the net asset value of the Shares.

The SEC has issued a proposed rule relating to a registered investment company’s use of derivatives and related instruments that, if adopted, could potentially require the Fund to reduce its use of leverage and/or observe more stringent asset coverage and related requirements than are currently imposed by the 1940 Act, which could adversely affect the value or performance of the Fund and the Shares.

The Fund also may borrow money in order to repurchase its shares or as a temporary measure for extraordinary or emergency purposes, including for the payment of dividends or the settlement of securities transactions which otherwise might require untimely dispositions of portfolio securities held by the Fund.

Mortgage-Related and Other Asset-Backed Securities . Mortgage-related securities are interests in pools of residential or commercial mortgage loans, including mortgage loans made by savings and loan institutions, mortgage bankers, commercial banks and others. Pools of mortgage loans are assembled as securities for sale to investors by various governmental, government-related, and private organizations.

Mortgage Pass-Through Securities. Interests in pools of mortgage-related securities differ from other forms of debt securities, since debt securities normally provide for periodic payment of interest in fixed amounts with principal payments at maturity or specified call dates. Instead, mortgage-related securities provide a monthly payment that consists of both interest and principal payments. In effect, these payments are a “pass-through” of the monthly payments made by individual borrowers on their residential or commercial mortgage loans, net of any fees paid to the issuer or guarantor of such securities. Additional payments are caused by prepayments of principal resulting from the sale of the underlying property, refinancing, or foreclosure, net of fees or costs that may be incurred. These differences can result in significantly greater price and yield volatility than is the case with traditional fixed income or debt securities. The timing and level of prepayments is unpredictable. A predominant factor affecting the prepayment rate on a pool of mortgage loans is the difference between the interest rates on outstanding mortgage loans and prevailing mortgage loan interest rates. Generally, prepayments on mortgage loans will increase during a period of falling mortgage interest rates and decrease during a period of rising mortgage interest rates. Accordingly, the amounts of prepayments available for reinvestment by the Fund are likely to be greater during a period of declining mortgage interest rates. When the Fund reinvests the proceeds of a prepayment in these circumstances, it will likely receive a rate of interest that is lower than the rate on the security that was prepaid. To the extent that the Fund purchases asset-backed securities at a premium, prepayments may result in a loss to the extent of the premium paid. If the Fund buys such securities at a discount, both scheduled payments and unscheduled prepayments should increase current income and total returns and unscheduled prepayments will also accelerate the recognition of income which, when distributed to shareholders, will be taxable as ordinary income. In a period of rising interest rates, prepayments of the underlying assets may occur at a slower than expected rate, with the result that the average life of mortgage pass-through securities held by the Fund may be lengthened (maturity extension risk). This particular risk may

effectively change a security that was considered short- or intermediate-term at the time of purchase into a longer-term security. Since the value of longer-term securities generally fluctuates more widely in response to changes in interest rates than does the value of shorter term securities, maturity extension risk could increase the price and yield volatility of mortgage- related securities held by the Fund. In the past, in certain market environments, the value and liquidity of many mortgage pass-through securities declined sharply. There can be no assurance that such declines will not recur. Investments in mortgage-backed securities may be subject to a high degree of credit risk, valuation risk, and liquidity risk. These risks may be even higher with mortgage pass-through securities supported by subprime mortgages.

Guarantors of Mortgage-Backed Securities. The principal governmental guarantor of mortgage-related securities is Ginnie Mae. Ginnie Mae is authorized to guarantee, with the full faith and credit of the U.S. Government, the timely payment of principal and interest on securities issued by institutions approved by Ginnie Mae (such as savings and loan institutions, commercial banks and mortgage bankers) and backed by pools of mortgages insured by the Federal Housing Administration (the “FHA”), or guaranteed by the Department of Veterans Affairs (the “VA”).

Government-related guarantors of securities not backed by the full faith and credit of the U.S. Government include Fannie Mae and Freddie Mac. Both are government sponsored corporations owned entirely by private stockholders. In September 2008, the U.S. Treasury Department announced that the government would be taking over Fannie Mae and Freddie Mac and placing the companies into a conservatorship. In addition, the U.S. Treasury announced additional steps that it intended to take with respect to the debt and mortgage-backed securities issued by Fannie Mae and Freddie Mac in order to support the conservatorship. Fannie Mae and Freddie Mac are continuing to operate as going concerns while in conservatorship and each remains liable for all of its respective obligations, including its guaranty obligations, associated with its mortgage-backed securities. No assurance can be given that these arrangements will continue, and it is possible that these entities will not have the funds to meet their payment obligations in the future. From time to time, proposals have been introduced before Congress for the purpose of restricting or eliminating federal sponsorship of Fannie Mae and Freddie Mac. The Fund cannot predict what legislation, if any, may be proposed in the future in Congress regarding such sponsorship or which proposals, if any, might be enacted. Such proposals, if enacted, might materially and adversely affect the availability of government guaranteed mortgage-backed securities and the liquidity and value of the Fund’s portfolio. Government-related guarantors may also issue Participation Certificates (“PCs”), which represent interests in conventional mortgages from Freddie Mac’s national portfolio. Freddie Mac guarantees the timely payment of interest and ultimate collection of principal, but PCs are not backed by the full faith and credit of the U.S. Government.

Private Mortgage-Backed Securities. Commercial banks, savings and loan institutions, private mortgage insurance companies, mortgage bankers and other secondary market issuers also create pass-through pools of conventional residential mortgage loans. Such issuers may, in addition, be the originators and/or servicers of the underlying mortgage loans as well as the guarantors of the mortgage-related securities. Pools created by such non- governmental issuers generally offer a higher rate of interest than government and government-related pools because they are not guaranteed by any government or agency. In addition, mortgage-related securities issued by these non-governmental issuers may experience higher rates of default on the underlying mortgages since these mortgage loans often do not meet the underwriting standards of government and government-related issuers. However, timely payment of interest and principal of these pools may be supported by various forms of insurance or guarantees, including individual loan, title, pool and hazard insurance, and letters of credit, which may be issued by governmental entities, private insurers, or the mortgage poolers. Such insurance and guarantees, and the creditworthiness of the issuers thereof will be considered in determining whether a mortgage-related security meets the Fund’s investment quality standards. Upon a breach of any representation or warranty that

materially and adversely affects the interests of the related certificate holders in a mortgage loan, the seller or servicer generally will be obligated either to cure the breach in all material respects, to repurchase the mortgage loan or, if the related agreement so provides, to substitute in its place another qualifying mortgage loan. Such a repurchase or substitution obligation may constitute the sole remedy available for the material breach of any such representation or warranty by the seller or servicer. There can be no assurance that the private insurers or guarantors can meet their obligations under the insurance policies or guarantee arrangements. These securities may be illiquid.

Mortgage-backed securities that are issued or guaranteed by the U.S. Government, its agencies or instrumentalities, are not subject to Fund industry concentration restrictions. In the case of privately issued mortgage-related securities, the Fund takes the position that mortgage-related securities do not represent interests in any particular “industry” or group of industries. In the case of privately issued mortgage-related securities whose underlying assets are neither U.S. Government securities nor U.S. Government insured mortgages, to the extent that real properties securing such assets may be located in the same geographical region, the security may be subject to a greater risk of default than other comparable securities in the event of adverse economic, political, or business developments that may affect such region and, ultimately, the ability of residential homeowners to make payments of principal and interest on the underlying mortgages.

Collateralized Mortgage Obligations and Real Estate Mortgage Investment Conduits (“CMOs”). A CMO is a hybrid between a mortgage-backed bond and a mortgage pass-through security. Similar to a bond, interest and prepaid principal is paid, in most cases, on a monthly basis. CMOs may be collateralized by whole mortgage loans, but are more often collateralized by portfolios of mortgage pass-through securities and their income streams. Some CMOs are directly supported by other CMOs, which, in turn, are supported by mortgage pools.

CMOs are issued in multiple classes, often referred to as “tranches,” with each tranche having a specific fixed or floating coupon rate and stated maturity or final distribution date. Payments of principal normally are applied to the CMO classes in the order of their respective stated maturities, so that no principal payments will be made on a CMO class until all other classes having an earlier stated maturity date are paid in full. Under the traditional CMO structure, the cash flows generated by the mortgages or mortgage pass-through securities in the collateral pool are used to first pay interest and then pay principal to the holders of the CMOs. Subject to the various provisions of individual CMO issues, the cash flow generated by the underlying collateral (to the extent it exceeds the amount required to pay the stated interest) is used to retire the bonds. The differing structures of CMO classes may create a wide variety of investment characteristics, such as yield, effective maturity, and interest rate sensitivity. As market conditions change, however, and particularly during periods of rapid or unanticipated changes in market interest rates, the attractiveness of the CMO classes and the ability of the structure to provide the anticipated investment characteristics may be significantly reduced. These changes can result in volatility in the market value, and, in some instances, reduced liquidity of the CMO class. A risk of CMOs is the uncertainty of the timing of cash flows that results from the rate of prepayments on the underlying mortgages serving as collateral and from the structure of the particular CMO transaction (that is, the priority of the individual tranches). An increase or decrease in prepayment rates (resulting from a decrease or increase in mortgage interest rates) may cause the CMOs to be retired substantially earlier than their stated maturities or final distribution dates and will affect the yield and price of CMOs. In addition, if the collateral securing CMOs or any third party guarantees are insufficient to make payments, the Fund could sustain a loss.

Securities may be backed by mortgage insurance, letters of credit, or other credit enhancing features. Although payment of the principal of, and interest on, the underlying collateral securing privately issued CMOs may be guaranteed by the U.S. Government or its agencies and

instrumentalities, these CMOs represent obligations solely of the private issuer and are not insured or guaranteed by the U.S. Government, or its agencies and instrumentalities.

New types of CMO tranches have evolved and will likely continue to evolve. For example, CMOs may include floating rate CMOs, inverse floating rate CMOs, parallel pay CMOs, planned amortization classes, accrual bonds, and CMO residuals. These newer structures affect the amount and timing of principal and interest received by each tranche from the underlying collateral. Under certain of these newer structures, certain classes of CMOs have priority over others with respect to the receipt of prepayments on the mortgages. Therefore, depending on the type of CMOs in which the Fund invests, the investment may be subject to a greater or lesser risk of prepayment than other types of MBS. CMOs may include real estate investment conduits, which are private entities formed for the purpose of holding a fixed pool of mortgages secured by an interest in real property.

Commercial Mortgage-Backed Securities. Commercial mortgage-backed securities include securities that reflect an interest in, and are secured by, mortgage loans on commercial real property. Many of the risks of investing in commercial mortgage-backed securities reflect the risks of investing in the real estate securing the underlying mortgage loans. These risks reflect the effects of local and other economic conditions on real estate markets, the ability of tenants to make loan payments, and the ability of a property to attract and retain tenants. Commercial mortgage-backed securities may be less liquid and exhibit greater price volatility than other types of mortgage- or asset-backed securities. They are typically not backed by any government or government agency or instrumentality.

Other Mortgage-Related Securities. Other mortgage-related securities include securities other than those described above that directly or indirectly represent a participation in, or are secured by and payable from, mortgage loans on real property, including mortgage dollar rolls, or stripped mortgage-backed securities.

Mortgage dollar rolls are instruments in which the Fund sells securities for delivery in the current month and simultaneously contracts with the same counterparty to repurchase similar (same type, coupon, and maturity) but not identical securities on a specified future date. During the roll period, the Fund loses the right to receive principal (including prepayments of principal) and interest paid on the securities sold. However, the Fund may benefit from the interest earned on the cash proceeds of the securities sold until the settlement date of the forward purchase.

The Fund is generally subject to the risks associated with the purchased security, such as credit risk and interest rate risk. In addition, if the broker-dealer to whom the Fund sells the security becomes insolvent, the Fund’s right to purchase or repurchase the mortgage-related securities subject to the mortgage dollar roll may be restricted. Also, the instrument that the Fund is required to repurchase may be worth less than an instrument that the Fund originally held. Successful use of mortgage dollar rolls will depend upon Lord Abbett’s ability to manage the Fund’s interest rate and mortgage prepayments exposure. For these reasons, there is no assurance that mortgage dollar rolls can be successfully employed. The use of this technique may diminish the investment performance of the Fund compared with what such performance would have been without the use of mortgage dollar rolls.

To Be Announced (“TBA”) Sale or Purchase Commitments. The Fund may enter into TBA sale commitments to sell mortgage-backed securities that it owns under delayed delivery arrangements. Proceeds of TBA sale commitments are not received until the contractual settlement date. During the time a TBA sale commitment is outstanding, equivalent deliverable securities or an offsetting TBA purchase commitment deliverable on or before the sale commitment date are held as “cover” for the transaction. Unsettled TBA sale commitments are valued at the current market value of the underlying securities, according to the Fund’s valuation procedures. The contract is adjusted to

market value daily and the change in market value is recorded by the Fund as unrealized appreciation (depreciation). Recently finalized FINRA rules include mandatory margin requirements for the TBA market with limited exceptions. TBA trades historically have not been required to be collateralized. The collateralization of TBA trades is intended to mitigate counterparty credit risk between trade and settlement, but could increase the cost of TBA transactions and impose added operational complexity.

Stripped Mortgage-Backed Securities (“SMBS”). SMBS are derivative multi-class mortgage securities. SMBS may be issued by agencies or instrumentalities of the U.S. Government, or by private originators of, or investors in, mortgage loans, including savings and loan associations, mortgage banks, commercial banks, investment banks, and special purpose entities of the foregoing. SMBS are usually structured with two classes that receive different proportions of the interest and principal distributions on a pool of mortgage assets. A common type of SMBS will have one class receiving some of the interest and most of the principal from the mortgage assets, while the other class will receive most of the interest and the remainder of the principal. In the most extreme case, one class will receive all of the interest (the interest-only or “IO” class), while the other class will receive all of the principal (the principal-only or “PO” class). The value of an IO class is extremely sensitive to the rate of principal payments (including prepayments) on the related underlying mortgage assets, and a rapid rate of principal payments may cause the Fund to lose money. The value of a PO class generally increases as interest rates decline and prepayment rates rise. Some IOs and POs 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. The price of these securities typically is more volatile than that of coupon-bearing bonds of the same maturity.

Other Asset-Backed Securities. The Fund, in accordance with its investment objectives and policies, may invest in asset-backed securities (unrelated to mortgage loans). Asset-backed securities are securities whose principal and interest payments are collateralized by pools of assets such as auto loans, credit card receivables, leases, installment contracts, and personal property. In addition to prepayment and extension risks, these securities present credit risks that are not inherent in mortgage-related securities because asset-backed securities generally do not have the benefit of a security interest in collateral that is comparable to mortgage assets. Credit card receivables generally are unsecured and the debtors on such receivables are entitled to the protection of a number of state and federal consumer credit laws, many of which give such debtors the right to set off certain amounts owed on the credit cards, thereby reducing the balance due. Automobile receivables generally are secured, but by automobiles rather than residential real property. Most issuers of automobile receivables permit the loan servicers to retain possession of the underlying obligations. If the servicer were to sell these obligations to another party, there is a risk that the purchaser would acquire an interest superior to that of the holders of the asset-backed securities. In addition, because of the large number of vehicles involved in a typical issuance and technical requirements under state laws, the trustee for the holders of the automobile receivables may not have a proper security interest in the underlying automobiles. Therefore, if the issuer of an asset-backed security defaults on its payment obligations, there is the possibility that, in some cases, the Fund will be unable to possess and sell the underlying collateral and that the Fund’s recoveries on repossessed collateral may not be available to support payments on these securities.

Credit-Linked Notes (“CLNs”). The Fund may invest in CLNs. CLNs are privately negotiated obligations whose returns are linked to the returns of one or more designated securities or other instruments that are referred to as “reference securities.” A CLN is generally issued by one party, typically a trust or a special purpose vehicle, with investment exposure or risk that is linked to a second party. The CLN’s price or coupon is linked to the performance of the reference security of the second party.

The Fund has the right to receive periodic interest payments from the CLN issuer at an agreed upon interest rate and, if there has been no default or other applicable declines in credit quality, a return of principal at the maturity date. The cash flows are dependent on specified credit-related events. Should the second party default or declare bankruptcy, the CLN holder will generally receive an amount equivalent to the recovery rate. The Fund also is exposed to the credit risk of the CLN issuer up to the full CLN purchase price, and CLNs are often not secured by the reference securities or other collateral. CLNs are also subject to the credit risk of the reference securities. If a reference security defaults or suffers certain other applicable declines in credit quality, the Fund may, instead of receiving repayment of principal, receive the security that has defaulted.

As with most derivative investments, valuation of a CLN may be difficult due to the complexity of the security. The market for CLNs may suddenly become illiquid. The other parties to the transactions may be the only investors with sufficient understanding of the CLN to be interested in bidding for it. Changes in liquidity may result in significant, rapid, and unpredictable changes in CLN prices. In certain cases, a CLN’s market price may not be available or the market may not be active.

Other Risks of Mortgage-Backed and Asset-Backed Securities . Mortgage-backed, mortgage-related, and other asset-backed securities are subject to risks in addition to those described above. These securities are often extremely complex and their documentation may be unclear, ambiguous, or poorly understood, which could lead to a misunderstanding or incorrect application of the securities’ terms, and may also lead to disputes. More junior securities are often illiquid and hard to value, and even senior securities may become so during periods of market stress or if there are issues relating to the underlying collateral. Regulatory issues relating to the underlying collateral may have unforeseen effects on the value of the securities and may cause them to decrease in value. In addition, servicers or trustees may not always act in the best interests of the holders of securities or of certain tranches of securities.

Municipal Bonds . In general, municipal bonds are debt obligations issued by or on behalf of states, territories, and possessions of the United States, the District of Columbia, Puerto Rico, Guam, and their political subdivisions, agencies, and instrumentalities. Municipal bonds are issued to obtain funds for various public purposes, including the construction of bridges, highways, housing, hospitals, mass transportation, schools, streets, and water and sewer works. They may be used, for example, to refund outstanding obligations, to obtain funds for general operating expenses, or to obtain funds to lend to other public institutions and facilities and in anticipation of the receipt of revenue or the issuance of other obligations. In addition, the term “municipal bonds” may include certain types of “private activity” bonds, including industrial development bonds issued by public authorities to obtain funds to provide privately operated housing facilities, sports facilities, convention or trade show facilities, airport, mass transit, port or parking facilities, air or water pollution control facilities, and certain facilities for water supply, gas, electricity, or sewerage or solid waste disposal. Under the Tax Reform Act of 1986, as amended, substantial limitations were imposed on new issues of municipal bonds to finance privately operated facilities.

From time to time, proposals have been introduced before Congress to restrict or eliminate the federal income tax exemption for interest on municipal bonds. Similar proposals may be introduced in the future. If any such proposal were enacted, it might have a negative impact on the value of those bonds.