INVESTMENT POLICIES

Each Fund may directly, or indirectly through a series of SSGA Master Trust (each such series, a “Portfolio”) or a Portfolio’s investment in an exchange traded product (“ETP”), invest in any of the instruments or engage in any of the investment practices described below if such investment or activity is consistent with the Fund’s investment objective and permitted by the Fund’s stated investment policies.

3

Table of Contents

Each Portfolio may invest in the following types of investments, consistent with its investment strategies and objective. Please see a Portfolio’s Prospectus for additional information regarding its principal investment strategies.

DIVERSIFICATION STATUS

Each Portfolio and Fund (except the SPDR SSGA Ultra Short Term Bond ETF, SSGA Ultra Short Term Bond Portfolio, SPDR SSGA Risk Aware ETF, State Street Risk Aware Portfolio, and State Street DoubleLine Total Return Tactical Portfolio) is classified as a “diversified” investment company under the 1940 Act. Under the 1940 Act, a diversified investment company, as to 75% of its total assets, may not purchase securities of any issuer (other than securities issued or guaranteed by the U.S. government, its agents or instrumentalities or securities of other investment companies) if, as a result, more than 5% of its total assets would be invested in the securities of such issuer, or more than 10% of the issuer’s outstanding voting securities would be held by the investment company.

The SPDR SSGA Ultra Short Term Bond ETF, SSGA Ultra Short Term Bond Portfolio, SPDR SSGA Risk Aware ETF, State Street Risk Aware Portfolio, SPDR DoubleLine Total Return Tactical ETF and State Street DoubleLine Total Return Tactical Portfolio are each classified as a non-diversified investment company under the 1940 Act. A “non-diversified” classification means that each Portfolio or Fund is not limited by the 1940 Act with regard to the percentage of its assets that may be invested in the securities of a single issuer. This means that each Portfolio or Fund may invest a greater portion of its assets in the securities of a single issuer than a diversified fund. This may have an adverse effect on a Portfolio or Fund’s performance or subject a Portfolio Interests or Fund’s Shares to greater price volatility than more diversified investment companies.

Each Portfolio and its corresponding Fund intend to maintain a level of diversification and otherwise conduct their operations so as to enable the Fund to qualify for treatment as a “regulated investment company” for purposes of the Internal Revenue Code of 1986, as amended (“Internal Revenue Code”), and to relieve the Fund of any liability for federal income tax to the extent that its earnings are distributed to shareholders. Compliance with the diversification requirements of the Internal Revenue Code may limit the investment flexibility of the Portfolios and may make it less likely that the Portfolios and Funds will meet their investment objectives.

CONCENTRATION

The Portfolios and Funds do not intend to concentrate their investments in any particular industry. The Portfolios and Funds (except the Blackstone / GSO Senior Loan Portfolio) look to the Global Industry Classification Standard Level 3 (Industries) in making industry determinations. The SPDR Blackstone / GSO Senior Loan ETF and Blackstone / GSO Senior Loan Portfolio look to S&P Industry Classifications in making industry determinations. The Trust’s general policy is to exclude securities of the U.S. government and its agencies or instrumentalities when measuring industry concentration.

COMMON STOCKS

Risks inherent in investing in equity securities include the risk that the financial condition of issuers may become impaired or that the general condition of the stock market may deteriorate (either of which may cause a decrease in the value of a Portfolio’s portfolio securities and therefore a decrease in the value of its Portfolio Interests). Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value as market confidence and perceptions change. These investor perceptions are based on various and unpredictable factors, including expectations regarding government, economic, monetary and fiscal policies; inflation and interest rates; economic expansion or contraction; and global or regional political, economic or banking crises.

PREFERRED SECURITIES

Preferred securities pay fixed or adjustable rate dividends to investors, and have “preference” over common stock in the payment of dividends and the liquidation of a company’s assets. This means that a company must pay dividends on preferred stock before paying any dividends on its common stock. In order to be payable, distributions on preferred securities must be declared by the issuer’s board of directors. Income payments on typical preferred securities currently outstanding are cumulative, causing dividends and distributions to accrue even if not declared by the board of directors or otherwise made payable. There is no assurance that dividends or distributions on the preferred securities in which a Portfolio invests will be declared or otherwise made payable.

The market value of preferred securities may be affected by favorable and unfavorable changes impacting companies in the utilities and financial services sectors, which are prominent issuers of preferred securities, and by actual and anticipated changes in tax laws.

Because the claim on an issuer’s earnings represented by preferred securities may become onerous when interest rates fall below the rate payable on such securities, the issuer may redeem the securities. Thus, in declining interest rate environments in particular, a Portfolio’s holdings of higher rate-paying fixed rate preferred securities may be reduced and a Portfolio would be unable to acquire securities paying comparable rates with the redemption proceeds.

4

Table of Contents

CONVERTIBLE SECURITIES

Convertible securities are bonds, debentures, notes, preferred stocks or other securities that may be converted or exchanged (by the holder or by the issuer) into shares of the underlying common stock (or cash or securities of equivalent value) at a stated exchange ratio. A convertible security may also be called for redemption or conversion by the issuer after a particular date and under certain circumstances (including a specified price) established upon issue. If a convertible security held by a Portfolio is called for redemption or conversion, the Portfolio could be required to tender it for redemption, convert it into the underlying common stock, or sell it to a third party.

Convertible securities generally have less potential for gain or loss than common stocks. Convertible securities generally provide yields higher than the underlying common stocks, but generally lower than comparable non-convertible securities. Because of this higher yield, convertible securities generally sell at a price above their “conversion value,” which is the current market value of the stock to be received upon conversion. The difference between this conversion value and the price of convertible securities will vary over time depending on changes in the value of the underlying common stocks and interest rates. When the underlying common stocks decline in value, convertible securities will tend not to decline to the same extent because of the interest or dividend payments and the repayment of principal at maturity for certain types of convertible securities. However, securities that are convertible other than at the option of the holder generally do not limit the potential for loss to the same extent as securities convertible at the option of the holder. When the underlying common stocks rise in value, the value of convertible securities may also be expected to increase. At the same time, however, the difference between the market value of convertible securities and their conversion value will narrow, which means that the value of convertible securities will generally not increase to the same extent as the value of the underlying common stocks. Because convertible securities may also be interest-rate sensitive, their value may increase as interest rates fall and decrease as interest rates rise. Convertible securities are also subject to credit risk, and are often lower-quality securities.

BONDS

A bond is an interest-bearing security issued by a company, governmental unit or, in some cases, a non-U.S. entity. The issuer of a bond has a contractual obligation to pay interest at a stated rate on specific dates and to repay principal (the bond’s face value) periodically or on a specified maturity date; provided, however, a zero coupon bond pays no interest to its holder during its life. The value of a zero coupon bond to a fund consists of the difference between such bond’s face value at the time of maturity and the price for which it was acquired, which may be an amount significantly less than its face value (sometimes referred to as a “deep discount” price).

An issuer may have the right to redeem or “call” a bond before maturity, in which case the investor may have to reinvest the proceeds at lower market rates. Most bonds bear interest income at a “coupon” rate that is fixed for the life of the bond. The value of a fixed rate bond usually rises when market interest rates fall, and falls when market interest rates rise. Accordingly, a fixed rate bond’s yield (income as a percent of the bond’s current value) may differ from its coupon rate as its value rises or falls. Fixed rate bonds generally are also subject to inflation risk, which is the risk that the value of the bond or income from the bond will be worth less in the future as inflation decreases the value of money. This could mean that, as inflation increases, the “real” value of the assets of a fund holding fixed rate bonds can decline, as can the value of the fund’s distributions. Other types of bonds bear income at an interest rate that is adjusted periodically. Because of their adjustable interest rates, the value of “floating-rate” or “variable-rate” bonds fluctuates much less in response to market interest rate movements than the value of fixed rate bonds. A Portfolio may treat some of these bonds as having a shorter maturity for purposes of calculating the weighted average maturity of its investment portfolio. Bonds may be senior or subordinated obligations. Senior obligations generally have the first claim on a corporation’s earnings and assets and, in the event of liquidation, are paid before subordinated obligations. Bonds may be unsecured (backed only by the issuer’s general creditworthiness) or secured (also backed by specified collateral).

In addition, each Portfolio may invest in corporate bonds. The investment return of corporate bonds reflects interest on the bond and changes in the market value of the bond. The market value of a corporate bond may be affected by the credit rating of the corporation, the corporation’s performance and perceptions of the corporation in the market place. There is a risk that the issuers of the securities may not be able to meet their obligations on interest or principal payments at the time called for by such a security.

SENIOR LOANS

The Blackstone / GSO Senior Loan Portfolio invests primarily in Senior Loans. Senior Loans consist generally of obligations of companies and other entities (collectively, “borrowers”) incurred for the purpose of reorganizing the assets and liabilities of a borrower; acquiring another company; taking over control of a company (leveraged buyout); temporary refinancing; or financing internal growth or other general business purposes. Senior Loans are often obligations of borrowers who have incurred a significant

5

Table of Contents

percentage of debt compared to their total assets and thus are highly leveraged. The Portfolio and Fund do not treat the banks originating or acting as agents for the lenders, or granting or acting as intermediary in participation interests, in loans held by the Portfolio as the issuers of such loans.

Senior Loans may be acquired by direct investment as a lender at the inception of the loan or by assignment of a portion of a loan previously made to a different lender or by purchase of a participation interest. If the Portfolio makes a direct investment in a Senior Loan as one of the lenders, it generally acquires the loan at or below par. This means the Portfolio receives a return at or above the full interest rate for the loan. If the Portfolio acquires its interest in Senior Loans in the secondary market or acquires a participation interest, the loans may be purchased or sold above, at, or below par, which can result in a yield that is below, equal to, or above the stated interest rate of the loan. At times, the Portfolio may be able to invest in Senior Loans only through assignments or participations.

When the Portfolio is a purchaser of an assignment, it succeeds to all the rights and obligations under the loan agreement of the assigning lender and becomes a lender under the loan agreement with the same rights and obligations as the assigning lender. These rights include the ability to vote along with the other lenders on such matters as enforcing the terms of the loan agreement ( e.g. , declaring defaults, initiating collection actions, etc.). Taking such actions typically requires at least a vote of the lenders holding a majority of the investment in the loan and may require a vote by lenders holding two-thirds or more of the investment in the loan. Because the Portfolio usually does not hold a majority of the investment in any loan, it will not be able by itself to control decisions that require a vote by the lenders.

The Fund may, but will not typically, invest in Senior Loans through participations. A participation interest represents a fractional interest in a loan held by the lender selling the Portfolio the participation interest. In the case of participations, the Portfolio will not have any direct contractual relationship with the borrower, the Portfolio’s rights to consent to modifications of the loan are limited and it is dependent upon the participating lender to enforce the Portfolio’s rights upon a default. The Portfolio will have the right to receive payments of principal, interest, and any fees to which it is entitled only from the lender selling the participation and only upon receipt by the lender of the payments from the borrower. The Fund will only purchase participations from lenders with credit ratings of Baa3 or higher by Moody’s or BBB- or higher by S&P or Fitch, or a comparable rating by another nationally recognized rating agency.

The Portfolio may be affected by the credit of both the agent and the lender from whom the Portfolio acquires a participation interest. These credit risks may include delay in receiving payments of principal and interest paid by the borrower to the agent or by the agent to the lender or offsets against payments received from the borrower. In the event of the borrower’s bankruptcy, the borrower’s obligation to repay the loan may be subject to defenses that the borrower can assert as a result of improper conduct by the agent.

Historically, the amount of public information available about a specific Senior Loan has been less extensive than if the loan were registered or exchange-traded.

The loans in which the Portfolio will invest will, in most instances, be Senior Loans, which are secured and senior to other indebtedness of the borrower. Each Senior Loan will generally be secured by collateral such as accounts receivable, inventory, equipment, real estate, intangible assets such as trademarks, copyrights and patents, and securities of subsidiaries or affiliates. The value of the collateral generally will be determined by reference to financial statements of the borrower, by an independent appraisal, by obtaining the market value of such collateral, in the case of cash or securities if readily ascertainable, or by other customary valuation techniques considered appropriate by the Adviser. The value of collateral may decline after the Portfolio’s investment, and collateral may be difficult to sell in the event of default. Consequently, the Portfolio may not receive all the payments to which it is entitled. By virtue of their senior position and collateral, Senior Loans typically provide lenders with the first right to cash flows or proceeds from the sale of a borrower’s collateral if the borrower becomes insolvent (subject to the limitations of bankruptcy law, which may provide higher priority to certain claims such as employee salaries, employee pensions, and taxes). This means Senior Loans are generally repaid before unsecured bank loans, corporate bonds, subordinated debt, trade creditors, and preferred or common stockholders. To the extent that the Portfolio invests in unsecured loans, if the borrower defaults on such loan, there is no specific collateral on which the lender can foreclose. If the borrower defaults on a subordinated loan, the collateral may not be sufficient to cover both the senior and subordinated loans.

Senior Loans will usually require, in addition to scheduled payments of interest and principal, the prepayment of the Senior Loan from free cash flow, as further described below. The degree to which borrowers prepay Senior Loans, whether as a contractual requirement or at their election, may be affected by general business conditions, the financial condition of the borrower and competitive conditions among loan investors, among others. As such, prepayments cannot be predicted with accuracy. Recent market conditions, including falling default rates among others, have led to increased prepayment frequency and loan renegotiations. These renegotiations are often on terms more favorable to borrowers. Upon a prepayment, either in part or in full, the actual outstanding debt on which the Portfolio derives interest income will be reduced. However, the Portfolio may receive a prepayment penalty fee assessed against the prepaying borrower.

6

Table of Contents

Senior Loans typically pay interest at least quarterly at rates which equal a fixed percentage spread over a base rate such as the London Interbank Offered Rate (“LIBOR”). For example, if LIBOR were 0.3% and the borrower was paying a fixed spread of 2.50%, the total interest rate paid by the borrower would be 2.80%. Additionally, many Senior Loans also have a minimum base rate, or floor, which will be used if the actual base rate is below this minimum base rate. This measure is designed to ensure lenders receive a minimum interest rate in periods of low interest rates. By illustration, if LIBOR were 0.3% and the borrower was paying a fixed spread of 2.50%, the total interest rate paid by the borrower would be 2.80%. However, if the same Senior Loan had a LIBOR floor of 1.50%, then 1.50% would be used as the base rate notwithstanding that LIBOR was currently at 0.3%, thereby making the interest rate paid the borrower 4.00% (1.50% LIBOR floor base rate plus 2.50% fixed spread). During periods when LIBOR is greater than the LIBOR floor, the LIBOR floor would have no impact on the interest rate paid by the borrower. Not all Senior Loans have LIBOR floors and this feature is a relatively recent invention which may not persist in future issuances of Senior Loans.

Although a base rate such as LIBOR can change every day, loan agreements for Senior Loans typically allow the borrower the ability to choose how often the base rate for its loan will reset. A single loan may have multiple reset periods at the same time, with each reset period applicable to a designated portion of the loan. Such reset periods can range from one day to one year, with most borrowers choosing monthly or quarterly reset periods. During periods of rising interest rates, borrowers will tend to choose longer reset periods, and during periods of declining interest rates, borrowers will tend to choose shorter reset periods. The fixed spread over the base rate on a Senior Loan typically does not change.

Senior Loans generally are arranged through private negotiations between a borrower and several financial institutions represented by an agent who is usually one of the originating lenders. In larger transactions, it is common to have several agents; however, generally only one such agent has primary responsibility for ongoing administration of a Senior Loan. Agents are typically paid fees by the borrower for their services.

The agent is primarily responsible for negotiating the loan agreement which establishes the terms and conditions of the Senior Loan and the rights of the borrower and the lenders. The agent also is responsible for monitoring collateral and for exercising remedies available to the lenders such as foreclosure upon collateral. The Sub-Adviser or its affiliates may from time to time borrow from financial institutions that act as agents for loans.

Loan agreements may provide for the termination of the agent’s agency status in the event that it fails to act as required under the relevant loan agreement, becomes insolvent, enters Federal Deposit Insurance Corporation (“FDIC”) receivership or, if not FDIC insured, enters into bankruptcy. Should such an agent, lender or assignor with respect to an assignment interpositioned between the Portfolio and the borrower become insolvent or enter FDIC receivership or bankruptcy, any interest in the Senior Loan of such person and any loan payment held by such person for the benefit of the Portfolio should not be included in such person’s or entity’s bankruptcy estate. If, however, any such amount were included in such person’s or entity’s bankruptcy estate, the Portfolio would incur certain costs and delays in realizing payment or could suffer a loss of principal or interest. In this event, the Portfolio and, therefore, the Fund could experience a decrease in the NAV.

Most borrowers pay their debts from cash flow generated by their businesses. If a borrower’s cash flow is insufficient to pay its debts, it may attempt to restructure its debts rather than sell collateral. Borrowers may try to restructure their debts by filing for protection under the federal bankruptcy laws or negotiating a work-out. If a borrower becomes involved in a bankruptcy proceeding, access to collateral may be limited by bankruptcy and other laws. Such action by a court could be based, for example, on a “fraudulent conveyance” claim to the effect that the borrower did not receive fair consideration for granting the security interest in the loan collateral to the Portfolio. If a court decides that access to collateral is limited or void, the Portfolio may not recover the full amount of principal and interest that is due.

A borrower must comply with certain restrictive covenants contained in the loan agreement. In addition to requiring the scheduled payment of principal and interest, these covenants may include restrictions on the payment of dividends and other distributions to the borrower’s shareholders, provisions requiring compliance with specific financial ratios, and limits on total indebtedness. The agreement may also require the prepayment of the loans from excess cash flow. A breach of a covenant that is not waived by the agent (or lenders directly) is normally an event of default, which provides the agent and lenders the right to call for repayment of the outstanding loan. The typical practice of an agent or a loan investor in relying exclusively or primarily on reports from the borrower to monitor the borrower’s compliance with covenants may involve a risk of fraud by the borrower.

In the process of buying, selling and holding Senior Loans, the Portfolio may receive and/or pay certain fees. These fees are in addition to interest payments received and may include facility fees, commitment fees, commissions and prepayment penalty fees. When the Portfolio buys or sells a Senior Loan it may pay a facility fee. On an ongoing basis, the Portfolio may receive a commitment fee based on the undrawn portion of the underlying line of credit portion of a Senior Loan. In certain circumstances, the Portfolio may receive a prepayment penalty fee upon prepayment of a Senior Loan. Other fees received by the Portfolio may include covenant waiver fees, covenant modification fees or other consent or amendment fees.

7

Table of Contents

Notwithstanding its intention in certain situations to not receive material, non-public information with respect to its management of investments in Senior Loans, the Adviser and/or Sub-Adviser may from time to time come into possession of material, non-public information about the issuers of loans that may be held in the Portfolio’s portfolio. Possession of such information may in some instances occur despite the Adviser’s and/or Sub-Adviser’s efforts to avoid such possession, but in other instances the Adviser and/or Sub-Adviser may choose to receive such information (for example, in connection with participation in a creditors’ committee with respect to a financially distressed issuer). The Adviser’s and/or Sub-Adviser’s ability to trade in these Senior Loans for the account of the Portfolio could potentially be limited by its possession of such information. Such limitations on the Adviser’s and/or Sub-Adviser’s ability to trade could have an adverse effect on the Portfolio by, for example, preventing the Portfolio from selling a Senior Loan that is experiencing a material decline in value. In some instances, these trading restrictions could continue in effect for a substantial period of time.

The loan market, as represented by the S&P/LSTA (Loan Syndications and Trading Association) Leveraged Loan Index, experienced significant growth in terms of number and aggregate volume of loans outstanding since the inception of the index in 1997. In 1997, the total amount of loans in the market aggregated less than $10 billion. By April of 2000, it had grown to over $100 billion, and by July of 2007 the market had grown to over $500 billion. The size of the market peaked in November of 2008 at $594 billion. During this period, the demand for loans and the number of investors participating in the loan market also increased significantly.

Since 2008, the aggregate size of the market has contracted, characterized by limited new loan issuance and payoffs of outstanding loans. From the peak in 2008 through July 2010, the overall size of the loan market contracted by approximately 15%. The number of market participants also decreased during that period. There can be no assurance that the size of the loan market, and the number of participants, will return to earlier levels.

An increase in demand for Senior Loans may benefit the Portfolio by providing increased liquidity for such loans and higher sales prices, but it may also adversely affect the rate of interest payable on such loans acquired by the Portfolio and the rights provided to the Portfolio under the terms of the applicable loan agreement, and may increase the price of loans that the Portfolio wishes to purchase in the secondary market. A decrease in the demand for Senior Loans may adversely affect the price of loans in the Portfolio’s portfolio, which could cause the Portfolio’s and, therefore, the Fund’s net asset value to decline.

The Portfolio may acquire interests in Senior Loans which are designed to provide temporary or “bridge” financing to a borrower pending the sale of identified assets or the arrangement of longer-term loans or the issuance and sale of debt obligations. The Portfolio may also invest in Senior Loans of borrowers that have obtained bridge loans from other parties. A borrower’s use of bridge loans involves a risk that the borrower may be unable to locate permanent financing to replace the bridge loan, which may impair the borrower’s perceived creditworthiness. Bridge loans may have less liquidity than other Senior Loans that were issued to fund corporate purposes on a longer term basis.

Although not anticipated in the normal course, the Portfolio may occasionally acquire warrants and other equity securities as part of a unit combining a Senior Loan and equity securities of a borrower or its affiliates. The acquisition of such equity securities will only be incidental to the Portfolio’s purchase of a Senior Loan. The Portfolio may also acquire equity securities or credit securities (including non-dollar denominated equity or credit securities) issued in exchange for a Senior Loan or issued in connection with the debt restructuring or reorganization of a Borrower, or if such acquisition, in the judgment of the Adviser may enhance the value of a Senior Loan or would otherwise be consistent with the Portfolio’s investment policies. Such warrants and equity securities will typically have limited value and there is no assurance that such securities will ever obtain value.

OTHER LOANS

The Blackstone / GSO Senior Loan Portfolio may invest in secured loans that are not first lien and loans that are unsecured. These loans have the same characteristics as Senior Loans except that such loans are not first in priority of repayment and/or are not secured by collateral. Accordingly, the risks associated with these loans are higher than the risks for loans with first priority over the collateral. Because these loans are lower in priority and/or unsecured, they are subject to the additional risk that the cash flow of the borrower may be insufficient to meet scheduled payments after giving effect to the secured obligations of the borrower. In the event of default on such a loan, the first priority lien holder has first claim to the underlying collateral of the loan. It is possible that no value would remain for the holders of secured loans that are not first lien and loans that are unsecured and therefore result in a loss of investment to the Portfolio.

Secured loans that are not first lien and loans that are unsecured generally have greater price volatility than Senior Loans and may be less liquid. There is also a possibility that originators will not be able to sell participations in these loans, which would create greater credit risk exposure for the holders of such loans. Secured loans that are not first lien and loans that are unsecured share the same risks as other below investment grade instruments.

8

Table of Contents

VARIABLE AND FLOATING RATE SECURITIES

Variable rate securities are instruments issued or guaranteed by entities such as (1) US government, or an agency or instrumentality thereof, (2) corporations, (3) financial institutions, (4) insurance companies or (5) trusts that have a rate of interest subject to adjustment at regular intervals but less frequently than annually. A variable rate security provides for the automatic establishment of a new interest rate on set dates. Variable rate obligations whose interest is readjusted no less frequently than annually will be deemed to have a maturity equal to the period remaining until the next readjustment of the interest rate. Each Portfolio may also purchase floating rate securities. A floating rate security provides for the automatic adjustment of its interest rate whenever a specified interest rate changes. Interest rates on these securities are ordinarily tied to, and are a percentage of, a widely recognized interest rate, such as the yield on 90-day US Treasury bills or the prime rate of a specified bank. These rates may change as often as twice daily. Generally, changes in interest rates will have a smaller effect on the market value of variable and fixed rate floating rate securities than on the market value of comparable fixed rate fixed income obligations. Thus, investing in variable and fixed rate floating rate securities generally allows less opportunity for capital appreciation and depreciation than investing in comparable fixed rate fixed income securities.

COMMERCIAL PAPER

Commercial paper consists of short-term, promissory notes issued by banks, corporations and other entities to finance short-term credit needs. These securities generally are discounted but sometimes may be interest bearing.

OTHER SHORT-TERM INSTRUMENTS

Each Portfolio may invest in short-term instruments, including money market instruments, (including money market funds advised by the Adviser), cash and cash equivalents, on an ongoing basis to provide liquidity or for other reasons. Money market instruments are generally short-term investments that may include but are not limited to: (i) shares of money market funds (including those advised by the Adviser); (ii) obligations issued or guaranteed by the U.S. government, its agencies or instrumentalities (including government-sponsored enterprises); (iii) negotiable certificates of deposit (“CDs”), bankers’ acceptances, fixed time deposits and other obligations of U.S. and foreign banks (including foreign branches) and similar institutions; (iv) commercial paper rated at the date of purchase “Prime-1” by Moody’s Investor’s Service (“Moody’s”) or “A-1” by Standard & Poor’s (“S&P”), or if unrated, of comparable quality as determined by the Adviser; (v) non-convertible corporate debt securities ( e.g. , bonds and debentures) with remaining maturities at the date of purchase of not more than 397 days and that satisfy the rating requirements set forth in Rule 2a-7 under the 1940 Act; and (vi) short-term U.S. dollar-denominated obligations of foreign banks (including U.S. branches) that, in the opinion of the Adviser, are of comparable quality to obligations of U.S. banks which may be purchased by a Portfolio. Any of these instruments may be purchased on a current or a forward-settled basis. Money market instruments also include shares of money market funds. Time deposits are non-negotiable deposits maintained in banking institutions for specified periods of time at stated interest rates. Bankers’ acceptances are time drafts drawn on commercial banks by borrowers, usually in connection with international transactions.

9

Table of Contents

HIGH YIELD SECURITIES

Investment in high yield securities generally provides greater income and increased opportunity for capital appreciation than investments in higher quality securities, but they also typically entail greater price volatility and credit risk. These high yield securities are regarded as predominantly speculative with respect to the issuer’s continuing ability to meet principal and interest payments. Analysis of the creditworthiness of issuers of debt securities that are high yield may be more complex than for issuers of higher quality debt securities. In addition, high yield securities are often issued by smaller, less creditworthy companies or by highly leveraged (indebted) firms, which are generally less able than more financially stable firms to make scheduled payments of interest and principal. The risks posed by securities issued under such circumstances are substantial.

Investing in high yield debt securities involves risks that are greater than the risks of investing in higher quality debt securities. These risks include: (i) changes in credit status, including weaker overall credit conditions of issuers and risks of default; (ii) industry, market and economic risk; and (iii) greater price variability and credit risks of certain high yield securities such as zero coupon and payment-in-kind securities. While these risks provide the opportunity for maximizing return over time, they may result in greater volatility of the value of a Portfolio and, therefore, a Fund than a fund that invests in higher-rated securities.

Furthermore, the value of high yield securities may be more susceptible to real or perceived adverse economic, company or industry conditions than is the case for higher quality securities. The market values of certain of these lower-rated and unrated debt securities tend to reflect individual corporate developments to a greater extent than do higher-rated securities which react primarily to fluctuations in the general level of interest rates, and tend to be more sensitive to economic conditions than are higher-rated securities. Adverse market, credit or economic conditions could make it difficult at certain times to sell certain high yield securities held by a Portfolio.

The secondary market on which high yield securities are traded may be less liquid than the market for higher grade securities. Less liquidity in the secondary trading market could adversely affect the price at which a Portfolio could sell a high yield security, and could adversely affect the daily net asset value per share of a Portfolio and, therefore, a Fund. When secondary markets for high yield securities are less liquid than the market for higher grade securities, it may be more difficult to value the securities because there is less reliable, objective data available.

The use of credit ratings as a principal method of selecting high yield securities can involve certain risks. For example, credit ratings evaluate the safety of principal and interest payments, not the market value risk of high yield securities. Also, credit rating agencies may fail to change credit ratings in a timely fashion to reflect events since the security was last rated.

SOVEREIGN DEBT OBLIGATIONS

Sovereign debt obligations are issued or guaranteed by foreign governments or their agencies. Sovereign debt may be in the form of conventional securities or other types of debt instruments such as loans or loan participations. Governmental entities responsible for repayment of the debt may be unable or unwilling to repay principal and pay interest when due, and may require renegotiation or reschedule of debt payments. In addition, prospects for repayment of principal and payment of interest may depend on political as well as economic factors. Although some sovereign debt, such as Brady Bonds, is collateralized by U.S. government securities, repayment of principal and payment of interest is not guaranteed by the U.S. government.

U.S. GOVERNMENT OBLIGATIONS

U.S. government obligations are a type of bond. U.S. government obligations include securities issued or guaranteed as to principal and interest by the U.S. government, its agencies or instrumentalities.

One type of U.S. government obligation, U.S. Treasury obligations, are backed by the full faith and credit of the U.S. Treasury and differ only in their interest rates, maturities, and times of issuance. U.S. Treasury bills have initial maturities of one-year or less; U.S. Treasury notes have initial maturities of one to ten years; and U.S. Treasury bonds generally have initial maturities of greater than ten years.

Other U.S. government obligations are issued or guaranteed by agencies or instrumentalities of the U.S. government including, but not limited to, Federal National Mortgage Association (“Fannie Mae”), the Government National Mortgage Association (“Ginnie Mae”), the Small Business Administration, the Federal Farm Credit Administration, the Federal Home Loan Mortgage Corporation (“Freddie Mac”), the Federal Home Loan Banks (“FHLB”), Banks for Cooperatives (including the Central Bank for Cooperatives), the Federal

10

Table of Contents

Land Banks, the Federal Intermediate Credit Banks, the Tennessee Valley Authority, the Export-Import Bank of the United States, the Commodity Credit Corporation, the Federal Financing Bank, the Student Loan Marketing Association, the National Credit Union Administration and the Federal Agricultural Mortgage Corporation (Farmer Mac). Some obligations issued or guaranteed by U.S. government agencies and instrumentalities, including, for example, Ginnie Mae pass-through certificates, are supported by the full faith and credit of the U.S. Treasury. Other obligations issued by or guaranteed by federal agencies, such as those securities issued by Fannie Mae, are supported by the discretionary authority of the U.S. government to purchase certain obligations of the federal agency, while other obligations issued by or guaranteed by federal agencies, such as those of the Federal Home Loan Banks, are supported by the right of the issuer to borrow from the U.S. Treasury. While the U.S. government provides financial support to such U.S. government-sponsored federal agencies, no assurance can be given that the U.S. government will always do so, since the U.S. government is not so obligated by law.

In September 2008, the U.S. Treasury announced a federal takeover of Fannie Mae and Freddie Mac, placing the two federal instrumentalities in conservatorship. Under the terms of the takeover, the U.S. Treasury agreed to acquire $1 billion of senior preferred stock of each instrumentality and obtained warrants for the purchase of common stock of each instrumentality. Under these Senior Preferred Stock Purchase Agreements (“SPAs”), the U.S. Treasury has pledged to provide a limited amount of capital per instrumentality as needed, including the contribution of cash capital to the instrumentalities in the event their liabilities exceed their assets. In May 2009, the U.S. Treasury increased its maximum commitment to each instrumentality under the SPAs from $100 billion to $200 billion per instrumentality. In December 2009, the U.S. Treasury amended the SPAs to provide Fannie Mae and Freddie Mac with some additional flexibility to meet the requirement to reduce their mortgage portfolios. Also in December 2009, the U.S. Treasury further amended the SPAs to allow the cap on the U.S. Treasury’s funding commitment to increase as necessary to accommodate any cumulative reduction in Fannie Mae’s and Freddie Mac’s net worth through the end of 2012. On August 17, 2012, the U.S. Treasury announced that it was again amending the Agreement to terminate the requirement that Fannie Mae and Freddie Mac each pay a 10% dividend annually on all amounts received under the funding commitment. Instead, they will transfer to the U.S. Treasury on a quarterly basis all profits earned during a quarter that exceed a capital reserve amount of $3 billion. The U.S. Treasury stated that the purpose of the change was to wind down Freddie Mac and Fannie Mae and to benefit taxpayers. At the start of 2013, the unlimited support the U.S. Treasury extended to the two companies expired — Fannie Mae’s bailout is now capped at $125 billion and Freddie Mac has a limit of $149 billion. In August 2013, President Obama announced his proposal to shut down Freddie Mac and Fannie Mae as part of a plan to overhaul the U.S.’s mortgage finance system. Until further action is taken, the actions of the U.S. Treasury are intended to ensure that Fannie Mae and Freddie Mac maintain a positive net worth and meet their financial obligations, preventing mandatory triggering of receivership. No assurance can be given that the U.S. Treasury initiatives will be successful.

MUNICIPAL SECURITIES

General. Municipal securities are securities issued by states, municipalities and other political subdivisions, agencies, authorities and instrumentalities of states and multi-state agencies or authorities. Shareholders should note that, although interest paid on municipal securities is generally exempt from regular federal income tax, a Portfolio does not anticipate holding municipal securities in sufficient quantities to enable the Fund to qualify to pay exempt-interest dividends. As a result, distributions by the Fund to shareholders are expected to be treated for federal income tax purposes as ordinary dividends without regard to the character in the hands of the Portfolio of any interest that it receives on municipal securities.

Municipal securities share the attributes of debt/fixed income securities in general, but are generally issued by states, municipalities and other political subdivisions, agencies, authorities and instrumentalities of states and multi-state agencies or authorities. The municipal securities which the Portfolio may purchase include general obligation bonds and limited obligation bonds (or revenue bonds), including industrial development bonds issued pursuant to former federal tax law. General obligation bonds are obligations involving the credit of an issuer possessing taxing power and are payable from such issuer’s general revenues and not from any particular source. Limited obligation bonds are payable only from the revenues derived from a particular facility or class of facilities or, in some cases, from the proceeds of a special excise or other specific revenue source. Tax-exempt industrial development bonds generally are also revenue bonds and thus are not payable from the issuer’s general revenues. The credit and quality of industrial development bonds are usually related to the credit of the corporate user of the facilities. Payment of interest on and repayment of principal of such bonds is the responsibility of the corporate user (and/or any guarantor).

Some longer-term municipal securities give the investor the right to “put” or sell the security at par (face value) within a specified number of days following the investor’s request—usually one to seven days. This demand feature enhances a security’s liquidity by shortening its effective maturity and enables it to trade at a price equal to or very close to par. If a demand feature terminates prior to being exercised, the Portfolio would hold the longer-term security, which could experience substantially more volatility.

The market for municipal bonds may be less liquid than for taxable bonds. This means that it may be harder to buy and sell municipal securities, especially on short notice, than non-municipal securities. There may also be less information available on the financial condition of issuers of municipal securities than for public corporations. This means that it may be harder to buy and sell municipal securities, especially on short notice, and municipal securities may be more difficult for a Portfolio to value accurately than securities of public corporations. If a Portfolio invests in municipal securities, the Portfolio’s portfolio may have greater exposure to liquidity risk than a fund that only invests in non-municipal securities. In addition, the municipal securities market is generally characterized as a buy and hold investment strategy. As a result, the accessibility of municipal securities in the market is generally greater closer to the original date of issue of the securities and lessens as the securities move further away from such issuance date.

11

Table of Contents

Municipal securities are subject to credit and market risk. Generally, prices of higher quality issues tend to fluctuate more with changes in market interest rates than prices of lower quality issues and prices of longer maturity issues tend to fluctuate more than prices of shorter maturity issues.

Prices and yields on municipal securities are dependent on a variety of factors, including general money-market conditions, the financial condition of the issuer, general conditions of the municipal security market, the size of a particular offering, the maturity of the obligation and the rating of the issue. A number of these factors, including the ratings of particular issues, are subject to change from time to time. Information about the financial condition of an issuer of municipal securities may not be as extensive as that which is made available by corporations whose securities are publicly traded. As a result, municipal securities may be more difficult to value than securities of public corporations.

Obligations of issuers of municipal securities are subject to the provisions of bankruptcy, insolvency and other laws affecting the rights and remedies of creditors. Congress or state legislatures may seek to extend the time for payment of principal or interest, or both, or to impose other constraints upon enforcement of such obligations. In addition, municipal securities are subject to the risk that their tax treatment could be changed by Congress or state legislatures, thereby affecting the value of outstanding municipal securities. There is also the possibility that as a result of litigation or other conditions, the power or ability of issuers to meet their obligations for the payment of interest and principal on their municipal securities may be materially affected or their obligations may be found to be invalid or unenforceable. Such litigation or conditions may from time to time have the effect of introducing uncertainties in the market for municipal securities or certain segments thereof, or of materially affecting the credit risk with respect to particular bonds. Adverse economic, business, legal or political developments might affect all or a substantial portion of a Portfolio’s municipal securities in the same manner.

Municipal Leases and Certificates of Participation. Also included within the general category of municipal securities are municipal leases, certificates of participation in such lease obligations or installment purchase contract obligations (hereinafter collectively called “Municipal Lease Obligations”) of municipal authorities or entities. Although a Municipal Lease Obligation does not constitute a general obligation of the municipality for which the municipality’s taxing power is pledged, a Municipal Lease Obligation is ordinarily backed by the municipality’s covenant to budget for, appropriate and make the payments due under the Municipal Lease Obligation. However, certain Municipal Lease Obligations contain “non-appropriation” clauses which provide that the municipality has no obligation to make lease or installment purchase payments in future years unless money is appropriated for such purpose on a yearly basis. In the case of a “non-appropriation” lease, a Portfolio’s ability to recover under the lease in the event of non-appropriation or default will be limited solely to the repossession of the leased property, without recourse to the general credit of the lessee, and disposition or releasing of the property might prove difficult.

Municipal Insurance. A municipal security may be covered by insurance that guarantees the bond’s scheduled payment of interest and repayment of principal. This type of insurance may be obtained by either (i) the issuer at the time the bond is issued (primary market insurance), or (ii) another party after the bond has been issued (secondary market insurance).

Both primary and secondary market insurance guarantee timely and scheduled repayment of all principal and payment of all interest on a municipal security in the event of default by the issuer, and cover a municipal security to its maturity, enhancing its credit quality and value.

Municipal security insurance does not insure against market fluctuations or fluctuations in the Portfolio’s share price. In addition, a municipal security insurance policy will not cover: (i) repayment of a municipal security before maturity (redemption), (ii) prepayment or payment of an acceleration premium (except for a mandatory sinking fund redemption) or any other provision of a bond indenture that advances the maturity of the bond, or (iii) nonpayment of principal or interest caused by negligence or bankruptcy of the paying agent. A mandatory sinking fund redemption may be a provision of a municipal security issue whereby part of the municipal security issue may be retired before maturity.

Because a significant portion of the municipal securities issued and outstanding is insured by a small number of insurance companies, an event involving one or more of these insurance companies could have a significant adverse effect on the value of the securities insured by that insurance company and on the municipal markets as a whole.

Municipal Market Disruption Risk. The value of municipal securities may be affected by uncertainties in the municipal market related to legislation or litigation involving the taxation of municipal securities or the rights of municipal securities holders in the event of a bankruptcy. Proposals to restrict or eliminate the federal income tax exemption for interest on municipal securities are introduced before Congress from time to time. Proposals also may be introduced before state legislatures that would affect the state tax treatment of a municipal fund’s distributions. If such proposals were enacted, the availability of municipal securities and the value of any

12

Table of Contents

municipal securities held by a Portfolio would be affected. Municipal bankruptcies are relatively rare, and certain provisions of the U.S. Bankruptcy Code governing such bankruptcies are unclear and remain untested. Further, the application of state law to municipal issuers could produce varying results among the states or among municipal securities issuers within a state. These legal uncertainties could affect the municipal securities market generally, certain specific segments of the market, or the relative credit quality of particular securities. Any of these effects could have a significant impact on the prices of some or all of the municipal securities held by a Portfolio.

INFLATION-PROTECTED OBLIGATIONS

Each Portfolio may invest in inflation-protected public obligations, commonly known as “TIPS,” of the U.S. Treasury, as well as inflation-protected public obligations of major governments and emerging market countries, excluding the United States. An inflation-protected public obligation is a type of security issued by a government that is designed to provide inflation protection to investors. Inflation-protected public obligations are income-generating instruments whose interest and principal payments are adjusted for inflation—a sustained increase in prices that erodes the purchasing power of money. The inflation adjustment, which is typically applied monthly to the principal of the bond, follows a designated inflation index, such as the Consumer Price Index. A fixed coupon rate is applied to the inflation-adjusted principal so that as inflation rises or falls, both the principal value and the interest payments will increase or decrease. This can provide investors with a hedge against inflation, as it helps preserve the purchasing power of an investment. Because of this inflation adjustment feature, inflation-protected bonds typically have lower yields than conventional fixed-rate bonds.

MORTGAGE PASS-THROUGH SECURITIES

Each Portfolio may invest in U.S. agency mortgage pass-through securities. The term “U.S. agency mortgage pass-through security” refers to a category of pass-through securities backed by pools of mortgages and issued by one of several U.S. government-sponsored enterprises: the Ginnie Mae, Fannie Mae or Freddie Mac. In the basic mortgage pass-through structure, mortgages with similar issuer, term and coupon characteristics are collected and aggregated into a “pool” consisting of multiple mortgage loans. The pool is assigned a CUSIP number and undivided interests in the pool are traded and sold as pass-through securities. The holder of the security is entitled to a pro rata share of principal and interest payments (including unscheduled prepayments) from the pool of mortgage loans.

An investment in a specific pool of pass-through securities requires an analysis of the specific prepayment risk of mortgages within the covered pool (since mortgagors typically have the option to prepay their loans). The level of prepayments on a pool of mortgage securities is difficult to predict and can impact the subsequent cash flows and value of the mortgage pool. In addition, when trading specific mortgage pools, precise execution, delivery and settlement arrangements must be negotiated for each transaction. These factors combine to make trading in mortgage pools somewhat cumbersome.

For the foregoing and other reasons, the Portfolios seek to obtain exposure to U.S. agency mortgage pass-through securities primarily through the use of “to-be-announced” or “TBA transactions.” “TBA” refers to a commonly used mechanism for the forward settlement of U.S. agency mortgage pass-through securities, and not to a separate type of mortgage-backed security. Most transactions in mortgage pass-through securities occur through the use of TBA transactions. TBA transactions generally are conducted in accordance with widely-accepted guidelines which establish commonly observed terms and conditions for execution, settlement and delivery. In a TBA transaction, the buyer and seller decide on general trade parameters, such as agency, settlement date, par amount, and price. The actual pools delivered generally are determined two days prior to settlement date. A Portfolio may use TBA transactions in several ways. For example, a Portfolio may enter into TBA agreements and “roll over” such agreements prior to the settlement date stipulated in such agreements. This type of TBA transaction is sometimes known as a “TBA roll.” In a TBA roll, a Portfolio generally will sell the obligation to purchase the pools stipulated in the TBA agreement prior to the stipulated settlement date and will enter into a new TBA agreement for future delivery of pools of mortgage pass-through securities. In addition, a Portfolio may enter into TBA agreements and settle such transactions on the stipulated settlement date by accepting actual receipt or delivery of the pools of mortgage pass-through securities stipulated in the TBA agreement.

Default by or bankruptcy of a counterparty to a TBA transaction would expose a Portfolio to possible loss because of adverse market action, expenses or delays in connection with the purchase or sale of the pools of mortgage pass-through securities specified in the TBA transaction. To minimize this risk, a Portfolio will enter into TBA transactions only with established counterparties (such as major broker-dealers) and the Adviser will monitor the creditworthiness of such counterparties. In addition, a Portfolio may accept assignments of TBA transactions from Authorized Participants (as defined below) from time to time. A Portfolio’s use of TBA rolls may cause the Portfolio to experience higher portfolio turnover, higher transaction costs and to pay higher capital gain distributions to shareholders (which may be taxable) than other funds.

13

Table of Contents

The Portfolios intend to invest cash pending settlement of any TBA transactions in money market instruments, repurchase agreements, commercial paper (including asset-backed commercial paper) or other high-quality, liquid short-term instruments, which may include money market funds affiliated with the Adviser.

U.S. REGISTERED SECURITIES OF FOREIGN ISSUERS

Each Portfolio may purchase exchange-traded common stocks and exchange-traded preferred securities of foreign corporations, as well as U.S. registered, dollar-denominated bonds of foreign corporations, governments, agencies and supra-national entities. Investing in U.S. registered, dollar-denominated, securities issued by non-U.S. issuers involves some risks and considerations not typically associated with investing in U.S. companies. These include differences in accounting, auditing and financial reporting standards, the possibility of expropriation or confiscatory taxation, adverse changes in investment or exchange control regulations, political instability which could affect U.S. investments in foreign countries, and potential restrictions of the flow of international capital. Foreign companies may be subject to less governmental regulation than U.S. issuers. Moreover, individual foreign economies may differ favorably or unfavorably from the U.S. economy in such respects as growth of gross domestic product, rate of inflation, capital reinvestment, resource self-sufficiency and balance of payment positions.

A Portfolio’s investments in common stock of foreign corporations may also be in the form of American Depositary Receipts (“ADRs”), Global Depositary Receipts (“GDRs”) and European Depositary Receipts (“EDRs”) (collectively “Depositary Receipts”). Depositary Receipts are receipts, typically issued by a bank or trust company, which evidence ownership of underlying securities issued by a foreign corporation. For ADRs, the depository is typically a U.S. financial institution and the underlying securities are issued by a foreign issuer. For other Depositary Receipts, the depository may be a foreign or a U.S. entity, and the underlying securities may have a foreign or a U.S. issuer. Depositary Receipts will not necessarily be denominated in the same currency as their underlying securities. Generally, ADRs, in registered form, are designed for use in the U.S. securities market, and EDRs, in bearer form, are designated for use in European securities markets. GDRs are tradable both in the United States and in Europe and are designed for use throughout the world. The State Street DoubleLine Total Return Tactical Portfolio may invest in sponsored or unsponsored ADRs; however, not more than 10% of the net assets of the State Street DoubleLine Total Return Tactical Portfolio will be invested in unsponsored ADRs. The issuers of unsponsored ADRs are not obligated to disclose material information in the United States, and, therefore, there may be less information available regarding such issuers and there may not be a correlation between such information and the market value of the ADRs.

ASSET-BACKED AND MORTGAGE-BACKED SECURITIES

Mortgage-backed securities, including CMOs and certain stripped mortgage-backed securities, represent a participation in, or are secured by, mortgage loans. Asset-backed securities are structured like mortgage-backed securities, but instead of mortgage loans or interests in mortgage loans, the underlying assets may include such items as motor vehicle installment sales or installment loan contracts, leases of various types of real and personal property and receivables from credit card agreements. The cash flow generated by the underlying assets is applied to make required payments on the securities and to pay related administrative expenses. The amount of residual cash flow resulting from a particular issue of asset-backed or mortgage-backed securities depends on, among other things, the characteristics of the underlying assets, the coupon rates on the securities, prevailing interest rates, the amount of administrative expenses and the actual prepayment experience on the underlying assets. The Portfolio may invest in any such instruments or variations as may be developed, to the extent consistent with its investment objective and policies and applicable regulatory requirements. In general, the collateral supporting asset-backed securities is of a shorter maturity than mortgage loans and is likely to experience substantial prepayments.

Mortgage-backed securities have yield and maturity characteristics corresponding to the underlying assets. Unlike traditional debt securities, which may pay a fixed rate of interest until maturity, when the entire principal amount comes due, payments on certain mortgage-backed securities include both interest and a partial repayment of principal. Besides the scheduled repayment of principal, repayments of principal may result from the voluntary prepayment, refinancing or foreclosure of the underlying mortgage loans. If property owners make unscheduled prepayments of their mortgage loans, these prepayments will result in early payment of the applicable mortgage-backed securities. In that event the Portfolio may be unable to invest the proceeds from the early payment of the mortgage-backed securities in an investment that provides as high a yield as the mortgage-backed securities. Consequently, early payment associated with mortgage-backed securities may cause these securities to experience significantly greater price and yield volatility than that experienced by traditional fixed-income securities. The occurrence of mortgage prepayments is affected by factors including the level of interest rates, general economic conditions, the location and age of the mortgage and other social and demographic conditions. During periods of falling interest rates, the rate of mortgage prepayments tends to increase, thereby tending

14

Table of Contents

to decrease the life of mortgage-backed securities. During periods of rising interest rates, the rate of mortgage prepayments usually decreases, thereby tending to increase the life of mortgage-backed securities. If the life of a mortgage-backed security is inaccurately predicted, the Portfolio may not be able to realize the rate of return it expected.

Adjustable rate mortgage securities (“ARMs”), like traditional mortgage-backed securities, are interests in pools of mortgage loans that provide investors with payments consisting of both principal and interest as mortgage loans in the underlying mortgage pool are paid off by the borrowers. Unlike fixed-rate mortgage-backed securities, ARMs are collateralized by or represent interests in mortgage loans with variable rates of interest. These interest rates are reset at periodic intervals, usually by reference to an interest rate index or market interest rate. Although the rate adjustment feature may act as a buffer to reduce sharp changes in the value of adjustable rate securities, these securities are still subject to changes in value based on, among other things, changes in market interest rates or changes in the issuer’s creditworthiness. Because the interest rates are reset only periodically, changes in the interest rate on ARMs may lag changes in prevailing market interest rates. Also, some ARMs (or the underlying mortgages) are subject to caps or floors that limit the maximum change in the interest rate during a specified period or over the life of the security. As a result, changes in the interest rate on an ARM may not fully reflect changes in prevailing market interest rates during certain periods.

A Portfolio may also invest in hybrid ARMs, whose underlying mortgages combine fixed-rate and adjustable rate features.

Mortgage-backed and asset-backed securities are less effective than other types of securities as a means of locking in attractive long-term interest rates. One reason is the need to reinvest prepayments of principal; another is the possibility of significant unscheduled prepayments resulting from declines in interest rates. These prepayments would have to be reinvested at lower rates. The automatic interest rate adjustment feature of mortgages underlying ARMs likewise reduces the ability to lock-in attractive rates. As a result, mortgage-backed and asset-backed securities may have less potential for capital appreciation during periods of declining interest rates than other securities of comparable maturities, although they may have a similar risk of decline in market value during periods of rising interest rates. Prepayments may also significantly shorten the effective maturities of these securities, especially during periods of declining interest rates. Conversely, during periods of rising interest rates, a reduction in prepayments may increase the effective maturities of these securities, subjecting them to a greater risk of decline in market value in response to rising interest rates than traditional debt securities, and, therefore, potentially increasing the volatility of the Portfolio and, therefore, the Fund.

At times, some mortgage-backed and asset-backed securities will have higher than market interest rates and therefore will be purchased at a premium above their par value. Prepayments may cause losses on securities purchased at a premium.

CMOs may be issued by a U.S. government agency or instrumentality or by a private issuer. 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 or instrumentalities, these CMOs represent obligations solely of the private issuer and are not insured or guaranteed by the U.S. government, its agencies or instrumentalities or any other person or entity.

Prepayments could cause early retirement of CMOs. CMOs are designed to reduce the risk of prepayment for certain investors by issuing multiple classes of securities, each having different maturities, interest rates and payment schedules, and with the principal and interest on the underlying mortgages allocated among the several classes in various ways. Payment of interest or principal on some classes or series of CMOs may be subject to contingencies or some classes or series may bear some or all of the risk of default on the underlying mortgages. CMOs of different classes or series are generally retired in sequence as the underlying mortgage loans in the mortgage pool are repaid. If enough mortgages are repaid ahead of schedule, the classes or series of a CMO with the earliest maturities generally will be retired prior to their maturities. Thus, the early retirement of particular classes or series of a CMO would have the same effect as the prepayment of mortgages underlying other mortgage-backed securities. Conversely, slower than anticipated prepayments can extend the effective maturities of CMOs, subjecting them to a greater risk of decline in market value in response to rising interest rates than traditional debt securities, and, therefore, potentially increasing their volatility.

Prepayments could result in losses on stripped mortgage-backed securities. Stripped mortgage-backed securities are usually structured with two classes that receive different portions of the interest and principal distributions on a pool of mortgage loans. The yield to maturity on an interest only or “IO” class of stripped mortgage-backed securities is extremely sensitive not only to changes in prevailing interest rates but also to the rate of principal payments (including prepayments) on the underlying assets. A rapid rate of principal prepayments may have a measurable adverse effect on the Portfolio’s yield to maturity to the extent it invests in IOs. If the assets underlying the IO experience greater than anticipated prepayments of principal, the Portfolio may fail to recoup fully its initial investment in these securities. Principal only or “POs” tend to increase in value if prepayments are greater than anticipated and decline if prepayments are slower than anticipated. The secondary market for stripped mortgage-backed securities may be more volatile and less liquid than that for other mortgage-backed securities, potentially limiting the Portfolio’s ability to buy or sell those securities at any particular time.

15

Table of Contents

Subprime mortgage loans, which typically are made to less creditworthy borrowers, have a higher risk of default than conventional mortgage loans. Therefore, mortgage-backed securities backed by subprime mortgage loans may suffer significantly greater declines in value due to defaults or the increased risk of default.

The risks associated with other asset-backed securities (including in particular the risks of issuer default and of early prepayment) are generally similar to those described above for CMOs. In addition, because asset-backed securities generally do not have the benefit of a security interest in the underlying assets that is comparable to a mortgage, asset-backed securities present certain additional risks that are not present with mortgage-backed securities. The ability of an issuer of asset-backed securities to enforce its security interest in the underlying assets may be limited. For example, revolving credit receivables are generally 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 debtors the right to set-off certain amounts owed, thereby reducing the balance due. Automobile receivables generally are secured, but by automobiles, rather than by real property.

Asset-backed securities may be collateralized by the fees earned by service providers. The values of asset-backed securities may be substantially dependent on the servicing of the underlying asset and are therefore subject to risks associated with the negligence or malfeasance by their servicers and to the credit risk of their servicers. In certain circumstances, the mishandling of related documentation may also affect the rights of the security holders in and to the underlying collateral. The insolvency of entities that generate receivables or that utilize the assets may result in added costs and delays in addition to losses associated with a decline in the value of the underlying assets.

Federal, state and local government officials and representatives as well as certain private parties have proposed actions to assist homeowners who own or occupy property subject to mortgages. Certain of those proposals involve actions that would affect the mortgages that underlie or relate to certain mortgage-related securities, including securities or other instruments which the Portfolio may hold or in which it may invest. Some of those proposals include, among other things, lowering or forgiving principal balances; forbearing, lowering or eliminating interest payments; or utilizing eminent domain powers to seize mortgages, potentially for below market compensation. The prospective or actual implementation of one or more of these proposals may significantly and adversely affect the value and liquidity of securities held by the Portfolio and could cause the Fund’s net asset value to decline, potentially significantly. Tremendous uncertainty remains in the market concerning the resolution of these issues; the range of proposals and the potential implications of any implemented solution is impossible to predict.

A Portfolio may invest in any level of the capital structure of an issuer of mortgage-backed or asset-backed securities, including the equity or “first loss” tranche. See “COLLATERALIZED DEBT OBLIGATIONS.”

Consistent with a Portfolio and Fund’s investment objective and policies, the Sub-Adviser may also cause the Portfolio to invest in other types of mortgage- and asset-backed securities offered currently or in the future, including certain yet-to-be-developed types of mortgage- and asset-backed securities which may be created as the market evolves.

COLLATERALIZED LOAN OBLIGATIONS (“CLOs”)

Each Portfolio (except the Blackstone / GSO Senior Loan Portfolio) may invest in CLOs. A CLO is a financing company (generally called a Special Purpose Vehicle or “SPV”), created to reapportion the risk and return characteristics of a pool of assets. While the assets underlying CLOs are typically Senior Loans, the assets may also include (i) unsecured loans, (ii) other debt securities that are rated below investment grade, (iii) debt tranches of other CLOs and (iv) equity securities incidental to investments in Senior Loans. When investing in CLOs, a Portfolio will not invest in equity tranches, which are the lowest tranche. However, a Portfolio may invest in lower debt tranches of CLOs, which typically experience a lower recovery, greater risk of loss or deferral or non-payment of interest than more senior debt tranches of the CLO. In addition, a Portfolio intends to invest in CLOs consisting primarily of individual Senior Loans of borrowers and not repackaged CLO obligations from other high risk pools. The underlying Senior Loans purchased by CLOs are generally performing at the time of purchase but may become non-performing, distressed or defaulted. CLOs with underlying assets of non-performing, distressed or defaulted loans are not contemplated to comprise a significant portion of a Portfolio’s investments in CLOs. The key feature of the CLO structure is the prioritization of the cash flows from a pool of debt securities among the several classes of the CLO. The SPV is a company founded solely for the purpose of securitizing payment claims arising out of this diversified asset pool. On this basis, marketable securities are issued by the SPV which, due to the diversification of the underlying risk, generally represent a lower level of risk than the original assets. The redemption of the securities issued by the SPV typically takes place at maturity out of the cash flow generated by the collected claims.

Holders of CLOs bear risks of the underlying investments, index or reference obligation and are subject to counterparty risk.

16

Table of Contents

A Portfolio may have the right to receive payments only from the CLOs, and generally does not have direct rights against the issuer or the entity that sold the assets to be securitized. While certain CLOs enable the investor to acquire interests in a pool of securities without the brokerage and other expenses associated with directly holding the same securities, investors in CLOs generally pay their share of the CLO’s administrative and other expenses. Although it is difficult to predict whether the prices of indices and securities underlying a CLO will rise or fall, these prices (and, therefore, the prices of CLOs) will be influenced by the same types of political and economic events that affect issuers of securities and capital markets generally. If the issuer of a CLO uses shorter term financing to purchase longer term securities, the issuer may be forced to sell its securities at below market prices if it experiences difficulty in obtaining short-term financing, which may adversely affect the value of the CLOs owned by a Portfolio.

Certain CLOs may be thinly traded or have a limited trading market. CLOs are typically privately offered and sold. As a result, investments in CLOs may be characterized by a Portfolio as illiquid securities. In addition to the general risks associated with debt securities discussed herein, CLOs carry additional risks, including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) the possibility that the investments in CLOs are subordinate to other classes or tranches thereof; and (iv) the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results.

COLLATERALIZED DEBT OBLIGATIONS

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

The cash flows from the CDO trust are generally split into two or more portions, called tranches, varying in risk and yield. Senior tranches are paid from the cash flows from the underlying assets before the junior tranches and equity or “first loss” tranches. Losses are first borne by the equity tranches, next by the junior tranches, and finally by the senior tranches. Senior tranches pay the lowest interest rates but are generally safer investments than more junior tranches because, should there be any default, senior tranches are typically paid first. The most junior tranches, such as equity tranches, would attract the highest interest rates but suffer the highest risk should the holder of an underlying loan default. If some loans default and the cash collected by the CDO is insufficient to pay all of its investors, those in the lowest, most junior tranches suffer losses first. Since it is partially protected from defaults, a senior tranche from a CDO trust typically has higher ratings and lower yields than the underlying securities, and can be rated investment grade. Despite the protection from the equity tranche, more senior CDO tranches can experience substantial losses due to actual defaults, increased sensitivity to defaults due to collateral default and disappearance of protecting tranches, market anticipation of defaults and aversion to CDO securities as a class.

Each Portfolio (except the Blackstone / GSO Senior Loan Portfolio) may, and the State Street DoubleLine Total Return Tactical Portfolio intends to, invest in CLOs. A CLO is a financing company (generally called a Special Purpose Vehicle or “SPV”), created to reapportion the risk and return characteristics of a pool of assets. While the assets underlying CLOs are typically bank loans, the assets may also include (i) unsecured loans, (ii) other debt securities that are rated below investment grade, (iii) debt tranches of other CLOs, and (iv) equity securities incidental to investments in bank loans. When investing in CLOs, the State Street DoubleLine Total Return Tactical Portfolio will not invest in equity tranches, which are the lowest tranche. However, the State Street DoubleLine Total Return Tactical Portfolio may invest in lower debt tranches of CLOs, which typically experience a lower recovery, greater risk of loss, or deferral or non-payment of interest than more senior debt tranches of the CLO. In addition, the State Street DoubleLine Total Return Tactical Portfolio intends to invest in CLOs consisting primarily of individual bank loans of borrowers and not repackaged CLO obligations from other high risk pools. The underlying bank loans purchased by CLOs are generally performing at the time of purchase but may become non-performing, distressed or defaulted. While CLOs with underlying assets of non-performing, distressed or defaulted loans are not contemplated to comprise a significant portion of the State Street DoubleLine Total Return Tactical Portfolio’s investments in CLOs, there can be no assurance that CLOs purchased by the State Street DoubleLine Total Return Tactical Portfolio with performing loans remain as such throughout the period that such CLOs are held by the State Street DoubleLine Total Return Tactical Portfolio.

The risks of an investment in a CDO depend largely on the quality and type of the collateral and the tranche of the CDO in which a Portfolio invests. Normally, CBOs, CLOs and other CDOs are privately offered and sold, and thus are not registered under the securities laws. As a result, investments in CDOs may be characterized by a Portfolio as illiquid securities; however, an active dealer market, or other relevant measures of liquidity, may exist for CDOs allowing a CDO potentially to be deemed liquid by the Adviser or

17

Table of Contents

Sub-Adviser under liquidity policies approved by the Board of Trustees of the Trust (the “Board”). In addition to the risks associated with debt instruments ( e.g., interest rate risk and credit risk), CDOs carry additional risks including, but not limited to: (i) the possibility that distributions from collateral securities will not be adequate to make interest or other payments; (ii) the quality of the collateral may decline in value or default; (iii) the possibility that a Portfolio may invest in CDOs that are subordinate to other classes; and (iv) the complex structure of the security may not be fully understood at the time of investment and may produce disputes with the issuer or unexpected investment results.

COLLATERALIZED MORTGAGE OBLIGATIONS (CMOS) AND MULTICLASS PASS-THROUGH SECURITIES

CMOs are debt obligations collateralized by mortgage loans or mortgage pass-through securities. CMOs may be collateralized by Government National Mortgage Association (“Ginnie Mae”), Federal National Mortgage Association (“Fannie Mae”), or Federal Home Loan Mortgage Corporation (“Freddie Mac”) certificates, but also may be collateralized by whole loans or private mortgage pass-through securities (such collateral is collectively hereinafter referred to as “Mortgage Assets”). Mortgage Assets may be collateralized by commercial or residential uses. Multiclass pass-through securities are equity interests in a trust composed of Mortgage Assets. Payments of principal of and interest on the Mortgage Assets, and any reinvestment income thereon, may require a Portfolio to pay debt service on the CMOs or make scheduled distributions on the multiclass pass-through securities. CMOs may be issued by federal agencies, or by private originators of, or investors in, mortgage loans, including savings and loan associations, mortgage banks, commercial banks, investment banks and special purpose subsidiaries of the foregoing. The issuer of a series of mortgage pass-through securities may elect to be treated as a Real Estate Mortgage Investment Conduit (REMIC). REMICs include governmental and/or private entities that issue a fixed pool of mortgages secured by an interest in real property. REMICs are similar to CMOs in that they issue multiple classes of securities, but unlike CMOs, which are required to be structured as debt securities, REMICs may be structured as indirect ownership interests in the underlying assets of the REMICs themselves. Although CMOs and REMICs differ in certain respects, characteristics of CMOs described below apply in most cases to REMICs, as well.

In a CMO, a series of bonds or certificates is issued in multiple classes. Each class of CMOs, often referred to as a tranche, is issued at a specific fixed or floating coupon rate and has a stated maturity or final distribution date. Principal prepayments on the Mortgage Assets may cause the CMOs to be retired substantially earlier than their stated maturities or final distribution dates. Interest is paid or accrues on all classes of the CMOs on a monthly, quarterly or semiannual basis. Certain CMOs may have variable or floating interest rates and others may be stripped mortgage securities. For more information on stripped mortgage securities, see “STRIPPED MORTGAGE SECURITIES.”

The principal of and interest on the Mortgage Assets may be allocated among the several classes of a CMO series in a number of different ways. Generally, the purpose of the allocation of the cash flow of a CMO to the various classes is to obtain a more predictable cash flow to certain of the individual tranches than exists with the underlying collateral of the CMO. As a general rule, the more predictable the cash flow is on a CMO tranche, the lower the anticipated yield will be on that tranche at the time of issuance relative to prevailing market yields on other mortgage-backed securities. As part of the process of creating more predictable cash flows on most of the tranches in a series of CMOs, one or more tranches generally must be created that absorb most of the volatility in the cash flows on the underlying mortgage loans. The yields on these tranches are generally higher than prevailing market yields on mortgage-backed securities with similar maturities. As a result of the uncertainty of the cash flows of these tranches, the market prices of and yield on these tranches generally are more volatile. See “COLLATERALIZED DEBT OBLIGATIONS” for a discussion on investments in structured products with multiple tranches.

CMO RESIDUALS

CMO residuals are mortgage securities 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, homebuilders, mortgage banks, commercial banks, investment banks and special purpose entities of the foregoing. The cash flow generated by the mortgage assets underlying a series of a CMO is applied first to make required payments of principal and interest on the securities or certificates issued by the CMO and second to pay the related administrative expenses and any management fee of the issuer. The residual in a CMO structure generally represents the interest in any excess cash flow remaining after making the foregoing payments. Each payment of such excess cash flow to a holder of the related CMO residual represents income and/or a return of capital. The amount of residual cash flow resulting from a CMO will depend on, among other things, the characteristics of the mortgage assets, the coupon rate of each class of CMO, prevailing interest rates, the amount of administrative expenses and the pre-payment experience on the mortgage assets. In particular, the yield to maturity on CMO residuals is extremely sensitive to pre-payments on the related underlying mortgage assets. In addition, if a series of a CMO includes a class that bears interest at an adjustable rate, the yield to maturity on the related CMO residual will also be extremely sensitive to changes in the level of the index upon which interest rate adjustments are based. As described below with respect to stripped mortgage-backed securities, in certain circumstances the Portfolio may fail to recoup fully its initial investment in a

18

Table of Contents

CMO residual. CMO residuals are generally purchased and sold by institutional investors through several investment banking firms acting as brokers or dealers. In addition, CMO residuals may, or pursuant to an exemption therefrom, may not have been registered under the Securities Act. CMO residuals, whether or not registered under the Securities Act, may be subject to certain restrictions on transferability, and may be deemed “illiquid.”

GOVERNMENT MORTGAGE PASS-THROUGH SECURITIES

Each Portfolio may invest in mortgage pass-through securities representing participation interests in pools of residential mortgage loans purchased from individual lenders by an agency, instrumentality or sponsored corporation of the United States government (“Federal Agency”) or originated by private lenders and guaranteed, to the extent provided in such securities, by a Federal Agency. Such securities, which are ownership interests in the underlying mortgage loans, differ from conventional debt securities, which provide for periodic payment of interest in fixed amounts (usually semiannually) and principal payments at payments (not necessarily in fixed amounts) that are a pass-through of the monthly interest and principal payments (including any prepayments) made by the individual borrowers on the pooled mortgage loans, net of any fees paid to the guarantor of such securities and the servicer of the underlying mortgage loans.

The government mortgage pass-through securities in which the Portfolio may invest include those issued or guaranteed by Ginnie Mae, Fannie Mae and Freddie Mac. Ginnie Mae certificates are direct obligations of the U.S. government and, as such, are backed by the full faith and credit of the United States. Fannie Mae is a federally chartered, privately owned corporation and Freddie Mac is a corporate instrumentality of the United States. Fannie Mae and Freddie Mac certificates are not backed by the full faith and credit of the United States but the issuing agency or instrumentality has the right to borrow, to meet its obligations, from an existing line of credit with the U.S. Treasury. The U.S. Treasury has no legal obligation to provide such line of credit and may choose not to do so.

Certificates for these types of mortgage-backed securities evidence an interest in a specific pool of mortgages. These certificates are, in most cases, modified pass-through instruments, wherein the issuing agency guarantees the payment of principal and interest on mortgages underlying the certificates, whether or not such amounts are collected by the issuer on the underlying mortgages.

The Housing and Economic Recovery Act of 2008 (“HERA”) authorized the Secretary of the Treasury to support Fannie Mae, Freddie Mac, and the Federal Home Loan Banks (“FHLBs”) (collectively, the “GSEs”) by purchasing obligations and other securities from those government-sponsored enterprises. HERA gave the Secretary of the Treasury broad authority to determine the conditions and amounts of such purchases.

On September 6, 2008, the Federal Housing Finance Agency (“FHFA”) placed Fannie Mae and Freddie Mac into conservatorship. As the conservator, FHFA succeeded to all rights, titles, powers and privileges of Fannie Mae and Freddie Mac and of any stockholder, officer or director of Fannie Mae and Freddie Mac with respect to Fannie Mae and Freddie Mac and the assets of Fannie Mae and Freddie Mac. FHFA selected a new chief executive officer and chairman of the board of directors for Fannie Mae and Freddie Mac.

In connection with the conservatorship, the U.S. Treasury, exercising powers granted to it under HERA, entered into a Senior Preferred Stock Purchase Agreement (“SPA”) with each of Fannie Mae and Freddie Mac pursuant to which the U.S. Treasury will purchase up to an aggregate of $100 billion of each of Fannie Mae and Freddie Mac to maintain a positive net worth in each enterprise. This agreement contains various covenants that severely limit each enterprise’s operations. In exchange for entering into these agreements, the U.S. Treasury received $1 billion of each enterprise’s senior preferred stock and warrants to purchase 79.9% of each enterprise’s common stock. On February 18, 2009, the U.S. Treasury announced that it was doubling the size of its commitment to each enterprise under the Senior Preferred Stock Program to $200 billion. The U.S. Treasury’s obligations under the Senior Preferred Stock Program are for an indefinite period of time for a maximum amount of $200 billion per enterprise. On December 24, 2009, the U.S. Treasury announced further amendments to the SPAs which included additional financial support for each GSE through the end of 2012 and changes to the limits on their retained mortgage portfolios. On August 17, 2012, the U.S. Treasury announced that it was again amending the Agreement to terminate the requirement that Fannie Mae and Freddie Mac each pay a 10% dividend annually on all amounts of received under the funding commitment. Instead, they will transfer to the U.S. Treasury on a quarterly basis all profits earned during a quarter that exceed a capital reserve amount of $3 billion. The U.S. Treasury stated that the purpose of the change was to wind down Freddie Mac and Fannie Mae and to benefit taxpayers. At the start of 2013, the unlimited support the U.S. Treasury extended to the two companies expired — Fannie Mae’s bailout is now capped at $125 billion and Freddie Mac has a limit of $149 billion. In August 2013, President Obama announced his proposal to shut down Freddie Mac and Fannie Mae as part of a plan to overhaul the U.S.’s mortgage finance system. Until further action is taken, the actions of the U.S. Treasury are intended to ensure that Fannie Mae and Freddie Mac maintain a positive net worth and meet their financial obligations, preventing mandatory triggering of receivership. No assurance can be given that the U.S. Treasury initiatives will be successful.

Under the Federal Housing Finance Regulatory Reform Act of 2008 (the “Reform Act”), which was included as part of Housing and Economic Recovery Act of 2008, FHFA, as conservator or receiver, has the power to repudiate any contract entered into by Fannie

19

Table of Contents

Mae or Freddie Mac prior to FHFA’s appointment as conservator or receiver, as applicable, if FHFA determines, in its sole discretion, that performance of the contract is burdensome and that repudiation of the contract promotes the orderly administration of Fannie Mae’s or Freddie Mac’s affairs. The Reform Act requires FHFA to exercise its right to repudiate any contract within a reasonable period of time after its appointment as conservator or receiver.

FHFA, in its capacity as conservator, has indicated that it has no intention to repudiate the guaranty obligations of Fannie Mae or Freddie Mac because FHFA views repudiation as incompatible with the goals of the conservatorship. However, in the event that FHFA, as conservator or if it is later appointed as receiver for Fannie Mae or Freddie Mac, were to repudiate any such guaranty obligation, the conservatorship or receivership estate, as applicable, would be liable for actual direct compensatory damages in accordance with the provisions of the Reform Act. Any such liability could be satisfied only to the extent of Fannie Mae’s or Freddie Mac’s available assets. The future financial performance of Fannie Mae and Freddie Mac is heavily dependent on the performance of the U.S. housing market.

In the event of repudiation, the payments of interest to holders of Fannie Mae, or Freddie Mac mortgage-backed securities would be reduced if payments on the mortgage loans represented in the mortgage loan groups related to such mortgage-backed securities are not made by the borrowers or advanced by the servicer. Any actual direct compensatory damages for repudiating these guaranty obligations may not be sufficient to offset any shortfalls experienced by such mortgage-backed security holders.

Further, in its capacity as conservator or receiver, FHFA has the right to transfer or sell any asset or liability of Fannie Mae or Freddie Mac without any approval, assignment or consent. Although FHFA has stated that it has no present intention to do so, if FHFA, as conservator or receiver, were to transfer any such guaranty obligation to another party, holders of Fannie Mae or Freddie Mac mortgage-backed securities would have to rely on that party for satisfaction of the guaranty obligation and would be exposed to the credit risk of that party.

In addition, certain rights provided to holders of mortgage-backed securities issued by Fannie Mae and Freddie Mac under the operative documents related to such securities may not be enforced against FHFA, or enforcement of such rights may be delayed, during the conservatorship or any future receivership. The operative documents for Fannie Mae and Freddie Mac mortgage-backed securities may provide (or with respect to securities issued prior to the date of the appointment of the conservator may have provided) that upon the occurrence of an event of default on the part of Fannie Mae or Freddie Mac, in its capacity as guarantor, which includes the appointment of a conservator or receiver, holders of such mortgage-backed securities have the right to replace Fannie Mae or Freddie Mac as trustee if the requisite percentage of mortgage-backed security holders consent. The Reform Act prevents mortgage-backed security holders from enforcing such rights if the event of default arises solely because a conservator or receiver has been appointed. The Reform Act also provides that no person may exercise any right or power to terminate, accelerate or declare an event of default under certain contracts to which Fannie Mae or Freddie Mac is a party, or obtain possession of or exercise control over any property of Fannie Mae or Freddie Mac, or affect any contractual rights of Fannie Mae or Freddie Mac, without the approval of FHFA, as conservator or receiver, for a period of 45 or 90 days following the appointment of FHFA as conservator or receiver, respectively.

PRIVATE MORTGAGE PASS-THROUGH SECURITIES

Private mortgage pass-through securities are structured similarly to the Ginnie Mae, Fannie Mae and Freddie Mac mortgage pass-through securities and are issued by United States and foreign private issuers such as originators of and investors in mortgage loans, including savings and loan associations, mortgage banks, commercial banks, investment banks and special purpose subsidiaries of the foregoing. These securities usually are backed by a pool of conventional fixed rate or adjustable rate mortgage loans. Since private mortgage pass-through securities typically are not guaranteed by an entity having the credit status of Ginnie Mae, Fannie Mae and Freddie Mac, such securities generally are structured with one or more types of credit enhancement.

Mortgage Assets often consist of a pool of assets representing the obligations of a number of different parties. There are usually fewer properties in a pool of assets backing commercial mortgage-backed securities than in a pool of assets backing residential mortgage-backed securities hence they may be more sensitive to the performance of fewer Mortgage Assets. To lessen the effect of failures by obligors on underlying assets to make payments, those securities may contain elements of credit support, which fall into two categories: (i) liquidity protection and (ii) protection against losses resulting from ultimate default by an obligor on the underlying assets. Liquidity protection refers to the provision of advances, generally by the entity administering the pool of assets, to ensure that the receipt of payments on the underlying pool occurs in a timely fashion. Protection against losses resulting from default ensures ultimate payment of the obligations on at least a portion of the assets in the pool. This protection may be provided through guarantees, insurance policies or letters of credit obtained by the issuer or sponsor from third parties, through various means of structuring the transaction or through a combination of such approaches. The degree of credit support provided for each issue is generally based on historical information respecting the level of credit risk associated with the underlying assets. Delinquencies or losses in excess of those anticipated could adversely affect the return on an investment in a security.

20

Table of Contents

BANK LOANS

Bank loans include floating rate loans and institutionally traded floating rate debt obligations issued by asset-backed pools and other issues, and interests therein. Bank loan interests may be acquired from U.S. or foreign commercial banks, insurance companies, finance companies or other financial institutions that have made loans or are members of a lending syndicate or from other holders of loan interests. Bank loans typically pay interest at rates which are re-determined periodically on the basis of a floating base lending rate (such as the London Inter-Bank Offered Rate) plus a premium. Bank loans are typically of below investment grade quality. Bank loans generally (but not always) hold the most senior position in the capital structure of a borrower and are often secured with collateral.

Each Portfolio may, and the State Street DoubleLine Total Return Tactical Portfolio intends to, invest in both secured and unsecured bank loans. Holders’ claims under unsecured loans are subordinated to claims of creditors holding secured indebtedness and possibly other classes of creditors holding unsecured debt. Unsecured loans have a greater risk of default than secured loans, particularly during periods of deteriorating economic conditions. Also, since they do not afford the lender recourse to collateral, unsecured loans are subject to greater risk of nonpayment in the event of default than secured loans. Many such loans are relatively illiquid and may be difficult to value.

Some bank loans are subject to the risk that a court, pursuant to fraudulent conveyance or other similar laws, could subordinate the bank loans to presently existing or future indebtedness of the borrower or take other action detrimental to the holders of the bank loans, including, in certain circumstances, invalidating such bank loans or causing interest previously paid to be refunded to the borrower. If interest were required to be refunded, it could negatively affect Portfolio performance.

Indebtedness of companies whose creditworthiness is poor involves substantially greater risks and may be highly speculative. Some companies may never pay off their indebtedness or pay only a small fraction of the amount owed. Consequently, when investing in indebtedness of companies with poor credit, the Portfolio bears a substantial risk of losing the entire amount invested.

Investments in bank loans through a direct assignment of the financial institution’s interest with respect to the bank loan may involve additional risks. For example, if a secured bank loan is foreclosed, the Portfolio could become part owner of any collateral, and would bear the costs and liabilities associated with owning and disposing of the collateral. In addition, it is conceivable that under emerging legal theories of lender liability, the Portfolio could be held liable as a co-lender.

Bank loans may be structured to include both term loans, which are generally fully funded at the time of investment, and revolving credit facilities, which would require the Portfolio to make additional investments in the bank loans as required under the terms of the credit facility at the borrower’s demand.

A financial institution’s employment as agent bank may be terminated in the event that it fails to observe a requisite standard of care or becomes insolvent. A successor agent bank would generally be appointed to replace the terminated agent bank, and assets held by the agent bank under the loan agreement would remain available to the holders of such indebtedness. However, if assets held by the agent bank for the benefit of a Portfolio were determined to be subject to the claims of the agent bank’s general creditors, the Portfolio may incur certain costs and delays in realizing payments on a bank loan or loan participation and could suffer a loss of principal and/or interest.

PERPETUAL BONDS

Perpetual bonds offer a fixed return with no maturity date. Because they never mature, perpetual bonds can be more volatile than other types of bonds that have a maturity date and may have heightened sensitivity to changes in interest rates. An issuer of perpetual bonds is responsible for coupon payments in perpetuity but does not have to redeem the securities. Perpetual bonds may be callable after a set period of time. It is possible that one or more perpetual bonds in which a Portfolio invests will be characterized as equity rather than debt for U.S. federal income tax purposes. Where such perpetual bonds are issued by non-U.S. issuers, they may be treated in turn as equity securities of a “passive foreign investment company.”

RESTRICTED SECURITIES

Restricted securities are securities that are not registered under the Securities Act, but which can be offered and sold to “qualified institutional buyers” under Rule 144A under the Securities Act. Institutional markets for restricted securities have developed as a result of the promulgation of Rule 144A under the

21