Investments, Risks and Performance

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Below Investment-Grade Fixed-Income Securities Risk is the risk that the Fund’s investments in below investment-grade fixed-income securities may be subject to greater risks than other fixed-income securities, including being subject to greater levels of interest rate risk, credit risk (including a greater risk of default) and liquidity risk. The ability of the issuer to make principal and interest payments is predominantly speculative for below investment-grade fixed-income securities.

Credit Risk is the risk that the issuer or guarantor of a fixed-income security in which the Fund invests, or the counterparty to a derivatives or other transaction will fail financially or otherwise be unwilling or unable to meet their obligations to the Fund.

Currency Risk is the risk that the value of the Fund’s investments will fall as a result of changes in exchange rates.

Derivatives Risk is the risk that the value of the Fund’s derivative investments such as options and futures transactions and swap transactions will fall, for example, because of changes in the value of the underlying reference instruments, pricing difficulties or lack of correlation with the underlying investments. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an advantageous time or price. Moreover, a number of broker-dealers and other financial institutions have recently experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance that the Fund’s derivative counterparties will not experience similar financial difficulties, possibly resulting in losses to the Fund. This risk is greater for swaps and other over-the-counter traded derivatives. Investing in derivatives gives rise to other risks, such as

2

Emerging Markets Risk is the risk that the Fund’s investments may face greater foreign securities risk. Investing in companies traded in emerging securities markets, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization and regulatory oversight in emerging market economies is generally less than in more developed markets.

Equity Securities Risk is the risk that the value of the Fund’s investments in equity securities could be subject to unpredictable declines in the value of individual securities and periods of below-average performance in individual securities or in the equity market as a whole. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock.

Extension Risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the expected prepayment time, typically reducing the security’s value.

Foreign Securities Risk is the risk that the value of the Fund’s foreign investments will fall as a result of foreign political, social, economic, environmental, credit, informational or currency changes or other issues relating to foreign investing generally. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. The Fund’s investments in foreign securities may be subject to foreign withholding taxes, which would decrease the yield on those securities.

Inflation/Deflation Risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the present value of future payments. Deflation risk is the risk that prices throughout the economy decline over time - the opposite of inflation. Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio.

Interest Rate Risk is the risk that the value of the Fund’s investments will fall if interest rates rise. Interest rate risk generally is greater for funds that invest in fixed-income securities with relatively longer durations than for funds that invest in fixed-income securities with shorter durations. The value of zero-coupon securities, pay-in-kind bonds and securities with longer maturities are generally more sensitive to fluctuations in interest rates than other fixed-income securities. In addition, an economic downturn or period of rising interest rates could adversely affect the market of these securities and reduce the Fund’s ability to sell them. Senior loans typically have adjustable rates. As a result, it is expected that the values of senior loans held by the Fund will fluctuate less in response to interest rate changes than will fixed-rate debt securities; however, the interest rates paid by these loans will generally decrease if interest rates fall. Senior loans and other fixed-income securities are subject to the risk that borrowers pay off the debts sooner than expected.

Issuer Risk is the risk that the value of securities may decline due to a number of reasons relating to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Large Investor Risk is the risk associated with ownership of shares of the Fund that may be concentrated in one or a few large investors. Such investors may redeem shares in large quantities or on a frequent basis. Redemptions by a large investor can affect the performance of the Fund, may increase realized capital gains, may accelerate the realization of taxable income to shareholders and may increase transaction costs. These transactions potentially limit the use of any capital loss carryforwards and certain other losses to offset future realized capital gains (if any). Such transactions may also increase the Fund’s expenses.

Leverage Risk is the risk associated with securities or practices (e.g., borrowing and the use of certain derivatives) and investment in certain types of derivatives that multiply small index, market or asset price movements into larger changes in value. Use of derivative instruments may involve leverage. When a derivative is used as a hedge against an offsetting position that the Fund also holds, any loss generated by the derivative should be substantially offset by gains on the hedged instrument, and vice versa. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. Futures are derivatives and may be subject to this type of risk.

Liquidity Risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Securities acquired in a private placement, such as Rule 144A securities, generally are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so, or at the most advantageous time or price. Liquidity issues may also make it difficult to value the Fund’s investments.

Management Risk is the risk that Loomis Sayles’ investment techniques will be unsuccessful and cause the Fund to incur losses.

Market Risk is the risk that the market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

Mortgage-Related and Asset-Backed Securities Risk is the risk that the securities may be prepaid and result in the reinvestment of the prepaid amounts in securities with lower yields than the prepaid obligations. Conversely, there is a risk that an unexpected rise in interest rates will extend the life of a mortgage-related or asset-backed security beyond the expected prepayment time, typically reducing the security’s value. The Fund may also incur a loss when there is a prepayment of securities that were purchased at a premium. It also includes risks associated with investing in the mortgages underlying the mortgage-backed securities. The market for mortgage-backed securities (and other asset-backed securities) has experienced high volatility and a lack of liquidity. As a result, the value of many of these securities has significantly declined. The Fund’s investments in other asset-backed securities are subject to risks similar to those associated with mortgage-related securities, as well as additional risks associated with the nature of the assets and the servicing of those assets.

Small-Capitalization Companies Risk is the risk that the Fund’s investments may be subject to more abrupt price movements, limited markets, increased volatility and less liquidity than investments in larger, more established companies, which could adversely affect the value of the portfolio.

Risk/Return Bar Chart and Table

The following bar chart and table give an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for the one-year, five-year and life-of-fund periods compared to those of a broad measure of market performance. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at www.loomissayles.com and/or by calling the Fund toll-free at 800-633-3330.

Total Returns for Institutional Class Shares

The Fund’s best quarter was 24.41%, (second quarter of 2009), and the Fund’s worst quarter was -18.26%, (fourth quarter of 2008).

Average Annual Total Returns for the periods ended December 31, 2012

	One Year	Five Years	Life-of-Fund (04/12/04)
Return Before Taxes	20.77%	10.24%	9.18%
Return After Taxes on Distributions	17.72%	6.99%	6.14%
Return After Taxes on Distributions and Sale of Fund Shares	13.40%	6.75%	6.01%
Barclays U.S. Corporate High-Yield Bond Index	15.81%	10.34%	8.75%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts. Index performance reflects no deduction for fees, expenses or taxes.

Investments, Risks and Performance

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Credit Risk is the risk that the issuer or guarantor of a fixed-income security in which the Fund invests, or the counterparty to a derivatives or other transaction will fail financially or otherwise be unwilling or unable to meet their obligations to the Fund.

Currency Risk is the risk that the value of the Fund’s investments will fall as a result of changes in exchange rates.

Derivatives Risk is the risk that the value of the Fund’s derivative investments such as structured notes, options and futures transactions and swap transactions will fall, for example, because of changes in the value of the underlying reference instruments, pricing difficulties or lack of correlation with the underlying investments. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an advantageous time or price. Moreover, a number of broker-dealers and other financial institutions have recently experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance that the Fund’s derivative counterparties will not experience similar financial difficulties, possibly resulting in losses to the Fund. This risk is greater for swaps and other over-the-counter traded derivatives. Investing in derivatives gives rise to

7

Extension Risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the expected prepayment time, typically reducing the security’s value.

Inflation/Deflation Risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the present value of future payments. Deflation risk is the risk that prices throughout the economy decline over time - the opposite of inflation. Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio.

Interest Rate Risk is the risk that the value of the Fund’s investments will fall if interest rates rise. Interest rate risk generally is greater for funds that invest in fixed-income securities with relatively longer durations than for funds that invest in fixed-income securities with shorter durations. The value of zero-coupon securities and securities with longer maturities are generally more sensitive to fluctuations in interest rates than other fixed-income securities. In addition, an economic downturn or period of rising interest rates could adversely affect the market of these securities and reduce the Fund’s ability to sell them.

Issuer Risk is the risk that the value of securities may decline due to a number of reasons relating to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Leverage Risk is the risk associated with securities or practices (e.g., borrowing and the use of certain derivatives) and investment in certain types of derivatives that multiply small index, market or asset price movements into larger changes in value. Use of derivative instruments may involve leverage. When a derivative is used as a hedge against an offsetting position that the Fund also holds, any loss generated by the derivative should be substantially offset by gains on the hedged instrument, and vice versa. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. Futures are derivatives and may be subject to this type of risk.

Liquidity Risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Securities acquired in a private placement, such as Rule 144A securities, generally are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so, or at the most advantageous time or price. Liquidity issues may also make it difficult to value the Fund’s investments.

Management Risk is the risk that Loomis Sayles’ investment techniques will be unsuccessful and cause the Fund to incur losses.

Market Risk is the risk that the market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

Mortgage-Related and Asset-Backed Securities Risk is the risk that the securities may be prepaid and result in the reinvestment of the prepaid amounts in securities with lower yields than the prepaid obligations. Conversely, there is a risk that an unexpected rise in interest rates will extend the life of a mortgage-related or asset-backed security beyond the expected prepayment time, typically reducing the security’s value. The Fund may also incur a loss when there is a prepayment of securities that were purchased at a premium. It also includes risks associated with investing in the mortgages underlying the mortgage-backed securities. The market for mortgage-backed securities (and other asset-backed securities) has experienced high volatility and a lack of liquidity. As a result, the value of many of these securities has significantly declined. The Fund’s investments in other asset-backed securities are subject to risks similar to those associated with mortgage-related securities, as well as additional risks associated with the nature of the assets and the servicing of those assets.

Risk/Return Bar Chart and Table

The following bar chart and table give an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for the one-year, five-year and life-of-fund periods compared to those of a broad measure of market performance. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at www.loomissayles.com and/or by calling the Fund toll-free at 800-633-3330.

Total Returns for Institutional Class Shares

The Fund’s best quarter was 8.33%, (third quarter of 2009), and the Fund’s worst quarter was -6.12%, (fourth quarter of 2008).

Average Annual Total Returns for the periods ended December 31, 2012

	One Year	Five Years	Life-of-Fund (03/02/06)
Return Before Taxes	8.53%	8.52%	7.68%
Return After Taxes on Distributions	6.43%	6.31%	5.58%
Return After Taxes on Distributions and Sale of Fund Shares	5.73%	6.01%	5.35%
Barclays U.S. Securitized Bond Index	3.01%	5.62%	5.80%

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts. Index performance reflects no deduction for fees, expenses or taxes.

Below Investment-Grade Fixed-Income Securities Risk

Below investment-grade fixed-income securities, also known as “junk bonds,” are rated below investment-grade quality and may be considered speculative with respect to the issuer’s continuing ability to make principal and interest payments. To be considered rated below investment-grade quality, none of the three major rating agencies (Moody’s Investors Service, Inc., Fitch Investor Services, Inc. or Standard & Poor’s Ratings Group) must have rated the security in one of their respective top four rating categories at the time a Fund acquires the security or, if the security is unrated, Loomis Sayles must have determined it to be of comparable quality. Analysis of the creditworthiness of issuers of below investment-grade securities may be more complex than for issuers of higher-quality debt securities, and the Fund’s ability to achieve its investment objectives may, to the extent the Fund invests in below investment-grade securities, be more dependent upon Loomis Sayles’ credit analysis than would be the case if the Fund were investing in higher-quality securities. The issuers of these securities may be in default or have a currently identifiable vulnerability to default on their payments of principal and interest, or may otherwise present elements of danger with respect to payments of principal or interest. However, a Fund will not invest in securities that are in default as to payment of principal and interest at the time of purchase, but may continue to hold securities that go into default after purchase.

Below investment-grade securities may be more susceptible to real or perceived adverse economic and competitive industry conditions than higher-grade securities. Yields on below investment-grade securities will fluctuate. If the issuer of below investment-grade securities defaults, a Fund may incur additional expenses to seek recovery.

The secondary markets in which below investment-grade securities are traded may be less liquid than the market for higher-grade securities. A lack of liquidity in the secondary trading markets could adversely affect the price at which the Fund could sell a particular below investment-grade security when necessary to meet liquidity needs or in response to a specific economic event, such as a deterioration in the creditworthiness of the issuer, and could adversely affect and cause large fluctuations in the net asset value (“NAV”) of a Fund’s shares. Adverse publicity and investor perceptions may decrease the values and liquidity of high yield securities generally.

It is reasonable to expect that any adverse economic conditions could disrupt the market for below investment-grade securities, have an adverse impact on the value of such securities and adversely affect the ability of the issuers of such securities to repay principal and pay interest thereon. New laws and proposed new laws may adversely impact the market for below investment-grade securities.

Credit Risk

This is the risk that the issuer or the guarantor of a fixed-income security the issuer or guarantor of a security backing the asset-backed securities in which a Fund invests, or the counterparty to a derivative or an over-the-counter transaction, will be unable or unwilling to make timely payments of interest or principal or to otherwise honor its obligations. Each Fund will be subject to credit risk to the extent that it invests in fixed-income securities or is a party to derivative or over-the-counter transactions.

A Fund that invests in below investment-grade fixed-income securities (“junk bonds”) is subject to greater credit risk, (because such securities are subject to a greater risk of default) and market risk than a fund that invests in higher-quality fixed-income securities. Below investment-grade fixed-income securities are considered predominantly speculative with respect to the ability of the issuer to make timely principal and interest payments.

The Funds’ investments in securities issued by U.S. government agencies are subject to credit risk. Agencies of the U.S. government are guaranteed as to payment of principal and interest of the relevant entity but are not backed by the full faith and credit of the U.S. government. An event affecting the guaranteeing entity could adversely affect the payment of principal or interest or

15

A Fund that invests in foreign securities is subject to increased credit risk because of, for example, the difficulties of requiring foreign entities to honor their contractual commitments and because financial reporting and other standards are often less robust in foreign countries.

Currency Risk

This is the risk that fluctuations in exchange rates between the U.S. dollar and foreign currencies, or between two or more foreign currencies, may cause the value of a Fund’s investments to decline. A Fund that may invest in securities or other instruments denominated in, or receive revenues in, foreign currency is subject to currency risk. Loomis Sayles may elect not to hedge currency risk or may hedge imperfectly, which may cause a Fund to incur losses that would not have been incurred had the risk been hedged. The market for some (or all) currencies may from time to time have low trading volume and become illiquid, which may prevent a Fund from effecting positions or from promptly liquidating unfavorable positions in such markets, thus subjecting a Fund to substantial losses.

Derivatives Risk

As described herein and in the SAI, the use of derivatives involves special risks. To the extent that a Fund uses a derivative security for purposes other than as a hedge, or if a Fund hedges imperfectly, a Fund is directly exposed to the risks of that derivative security and any loss generated by the derivative security will not be offset by a gain. A Fund may also use derivatives for leverage, which increases opportunities for gain but also involves greater risk of loss due to leverage risk, and to earn income, enhance yield or broaden the Fund’s diversification by gaining exposure to issuers, indices, sectors, currencies and/or geographic regions. The use of derivatives for these purposes entails greater risk than using derivatives solely for hedging purposes.

Funds that use derivatives also face additional risks, such as liquidity risk, market risk, management risk, the credit risk relating to the other party to a derivative contract (which is greater for forward currency contracts, swaps and other over-the-counter derivatives), the risk of difficulties in pricing and valuation, the risk of ambiguous documentation and the risk that changes in the value of a derivative may not correlate perfectly with relevant assets, rates or indices. This could, for example, cause a derivative transaction to imperfectly hedge the risk which it was intended to hedge. A Fund’s use of derivative instruments may involve risks greater than the risks associated with investing directly in securities and other traditional investments, may cause the Fund to lose more than the principal amount invested and may subject a Fund to the potential for unlimited loss. A Fund may be required to sell other securities at inopportune times to meet collateral requirements on its derivatives transactions. In addition, a Fund’s use of derivatives may increase or accelerate the amount of taxes payable by shareholders. Also, suitable derivative transactions may not be available in all circumstances and there can be no assurance that a Fund will engage in these transactions to reduce exposure to other risks when that would be beneficial or that, if used, such strategies will be successful.

Recently, several broker-dealers and other financial institutions have experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance that the Fund’s counterparties will not experience similar difficulties, possibly resulting in losses to the Fund. Losses resulting from the use of derivatives will reduce the Fund’s NAV, and possibly income, and the losses may be significantly greater than if derivatives had not been used. When used, derivatives may increase the amount and affect the timing and character of taxes payable by shareholders.

Emerging Markets Risk

Economic and Political Risks. Emerging market countries often experience instability in their political and economic structures and have less market depth, infrastructure, capitalization and regulatory oversight than more developed markets. Government actions could have a significant impact on the economic conditions in such countries, which in turn would affect the value and liquidity of the assets of a Fund invested in emerging market securities. Specific risks that could decrease a Fund’s return include seizure of a company’s assets, restrictions imposed on payments as a result of blockages on foreign currency exchanges and unanticipated social or political occurrences.

The ability of the government of an emerging market country to make timely payments on its debt obligations will depend on many factors, including the extent of its reserves, fluctuations in interest rates and access to international credit and investments. A country that has non-diversified exports or relies on certain key imports will be subject to greater fluctuations in the pricing of those commodities. Failure to generate sufficient earnings from foreign trade will make it difficult for an emerging market country to service its foreign debt.

Companies trading in developing securities markets are generally smaller and have shorter operating histories than companies trading in developed markets. Foreign investors may be required to register the proceeds of sales. Settlement of securities transactions in emerging markets may be subject to risk of loss and may be delayed more often than transactions settled in the United States. Disruptions resulting from social and political factors may cause the securities markets to close. If extended closings were to occur, the liquidity and value of the Fund’s assets invested in corporate debt obligations of emerging market companies would decline.

Investment Controls; Repatriation. Foreign investment in emerging market country debt securities is restricted or controlled to varying degrees. These restrictions may at times limit or preclude foreign investment in certain emerging market country debt securities. Certain emerging market countries require government approval of investments by foreign persons, limit the amount of investments by foreign persons in a particular issuer, limit investments by foreign persons only to a specific class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of the countries and/or impose additional taxes or controls on foreign investors or currency transactions. Certain emerging market countries may also restrict investment opportunities in issuers in industries deemed important to national interests.

Emerging market countries may require governmental approval for the repatriation of investment income, capital or proceeds of sale of securities by foreign investors. In addition, if a deterioration occurs in an emerging market country’s balance of payments, the country could impose temporary restrictions on foreign capital remittances. A Fund could be adversely affected by delays in, or a refusal to grant, any required governmental approval for repatriation of capital, as well as by the application to a Fund of any restrictions on investments. Investing in local markets in emerging market countries may require a Fund to adopt special procedures, seek local governmental approvals or take other actions, each of which may involve additional costs to a Fund.

Equity Securities Risk

The value of the Fund’s investments in equity securities is subject to the risks of unpredictable declines in the value of individual securities and periods of below-average performance in individual securities, industries or in the equity market as a whole. The market value of a security can change daily due to political, economic and other events that affect the securities markets generally, as well as those that affect particular companies or governments. These price movements, sometimes called volatility, will vary depending on the types of securities the Fund owns and the markets in which they trade. Historically, the equity markets have moved in cycles, and the value of the Fund’s equity securities may fluctuate drastically from day to day. Indvididual companies may report poor results or be negatively affected by industry and/or economic trends and developments. The prices of securities issued by such companies may suffer a decline in response to such trends and developments. In addition, the value of stock in the Fund’s portfolio may decline for a number of reasons that relate directly to the issuer. Those reasons may include, among other things, management performance, the effects of financial leverage and reduced demand for a company’s goods and services. Equity securities may take the form of stock in corporation, limited partnership interests, interests in limited liability companies, REITs or other trusts and other similar securities. Rule 144A securities may be less liquid than other equity securities. Equity securities may include common stock, preferred stocks, warrants, securities convertible into common and preferred stocks and other equity-like interests in an entity. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock.

Foreign Securities Risk

This is the risk associated with investments in issuers that are located or do business in foreign countries. The Loomis Sayles High Income Opportunities Fund is subject to this risk because it may invest up to 40% of its assets in securities of non-U.S. issuers. The Fund’s investments in foreign securities may be less liquid and may experience more rapid and extreme changes in value than investments in securities of U.S. issuers.

The securities markets of many foreign countries are relatively small, with a limited number of issuers and a small number of securities. In addition, foreign companies often are not subject to the same degree of regulation as U.S. companies. Reporting, accounting and auditing standards of foreign countries differ, in some cases significantly, from U.S. standards. Among other things, nationalization, expropriation or confiscatory taxation, currency blockage, political changes or diplomatic developments

17

Funds that invest in emerging markets may face greater foreign risk since emerging markets countries may be more likely to experience political and economic instability. See “Emerging Markets Risk.”

Although the Funds will invest only in U.S. dollar-denominated securities, the value of these securities may be adversely affected by changes in currency exchange rates.

Inflation/Deflation Risk

Inflation risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the present value of future payments. Deflation risk is the risk that prices throughout the economy decline over time (the opposite of inflation). Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of a Fund’s portfolio.

Interest Rate Risk

This is the risk that changes in interest rates will affect the value of a Fund’s investments in fixed-income securities, such as bonds, notes, asset-backed securities and other income producing securities and derivatives. Fixed-income securities are obligations of the issuer to make payments of principal and/or interest on future dates. Increases in interest rates may cause the value of a Fund’s investments to decline.

Even Funds that generally invest a significant portion of their assets in high quality fixed-income securities are subject to interest rate risk. Interest rate risk is greater for funds that generally invest a significant portion of their assets in below investment-grade fixed-income securities (commonly known as “junk bonds”) or comparable unrated securities.

Interest rate risk also is greater for funds that generally invest in fixed-income securities with longer maturities or durations than for funds that invest in fixed-income securities with shorter maturities or durations.

Interest rate risk is compounded for Funds when they invest a significant portion of their assets in mortgage-related or other asset-backed securities because the value of mortgage-related and asset-backed securities generally is more sensitive to changes in interest rates than other types of fixed-income securities. When interest rates rise, the maturities of mortgage-related and asset-backed securities tend to lengthen, and the value of these securities decreases more significantly than the value of other types of securities. In addition, these types of securities are subject to the risk of prepayment when interest rates fall, which generally results in lower returns because funds that hold these types of securities must reinvest assets previously invested in these types of securities in fixed-income securities with lower interest rates.

The Funds also face increased interest rate risk when they invest in fixed-income securities paying no current interest (such as zero-coupon securities and principal-only securities) interest-only securities and fixed-income securities paying non-cash interest in the form of other fixed-income securities, because the prices of those types of securities tend to react more to changes in interest rates.

Issuer Risk

The value of a Fund’s investments may decline for a number of reasons that directly relate to an issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services. Because asset-backed securities are typically pools of other securities or assets, this risk also relates to the issuer of securities backing the asset-backed securities in which a Fund invests.

Large Investor Risk

Ownership of shares of the Fund may be concentrated in one or a few large investors. Such investors may redeem shares in large quantities or on a frequent basis. Redemptions by a large investor can affect the performance of the Fund, may increase realized capital gains, may accelerate the realization of taxable income to shareholders and may increase transaction costs. These transactions potentially limit the use of any capital loss carryforwards and certain other losses to offset future realized capital gains (if any). Such transactions may also increase the Fund’s expenses.

Leverage Risk

When a Fund borrows money or otherwise leverages its portfolio, the value of an investment in the Fund will be more volatile, and all other risks are generally compounded. Funds face this risk if they create leverage by using investments such as reverse repurchase agreements, inverse floating-rate instruments or derivatives, or by borrowing money. The use of leverage may lead to losses that are greater than if the Fund had not used leverage.

Liquidity Risk

Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing a Fund from selling these illiquid securities at the price or at the time desired. Liquidity issues could also make it difficult to value a Fund’s investments, which could also negatively impact NAV. An unrated security may be less liquid than a comparable rated security and involves the risk that Loomis Sayles may not accurately evaluate the security’s comparative credit rating. Derivatives and securities that involve substantial interest rate risk or credit risk tend to involve greater liquidity risk. In addition, liquidity risk tends to increase to the extent a Fund invests in securities whose sale may be restricted by law or by contract, such as Rule 144A securities. Investment in derivatives may be less liquid when compared to other investments, especially during periods of market stress.

Management Risk

Management risk is the risk that Loomis Sayles’ investment techniques could fail to achieve a Fund’s objective and could cause your investment in a Fund to lose value. The Funds are subject to management risk because they are actively managed by Loomis Sayles. Loomis Sayles will apply its investment techniques and risk analyses in making investment decisions for each Fund, but there can be no guarantee that Loomis Sayles’ decisions will produce the desired results. For example, securities that Loomis Sayles expects may appreciate in value may in fact decline. Similarly, in some cases derivative and other investment techniques may be unavailable or Loomis Sayles may decide not to use them, even under market conditions where their use could have benefited a Fund.

Market Risk

Market risk is the risk that the value of a Fund’s investments will change as financial markets fluctuate and that prices overall may decline. The value of a company’s securities may fall as a result of factors that directly relate to that company, such as decisions made by its management or lower demand for the company’s products or services. A security’s value also may fall because of factors affecting not just the issuer of a security, but other companies in its industry or in a number of different industries, such as increases in production costs. The value of a Fund’s securities also may be affected by changes in financial market or other economic conditions, such as changes in interest rates or currency exchange rates. In addition, a company’s stock generally pays dividends only after the company makes required payments to holders of its bonds or other debt. For this reason, the value of the stock will usually react more strongly than bonds and other fixed-income securities to actual or perceived changes in the company’s financial condition or prospects. Market risk tends to be greater when a Fund invests in fixed-income securities with longer maturities.

Securities issued in initial public offerings tend to involve greater market risk than other equity securities due, in part, to public perception and the lack of publicly available information and trading history. This may impact a Fund’s performance and result in higher portfolio turnover, which may increase the tax liability to shareholders and the brokerage expenses incurred by the Fund.

Mortgage-Related and Asset-Backed Securities Risk

Mortgage-related securities, such as Government National Mortgage Association certificates or securities issued by the Federal National Mortgage Association, differ from traditional fixed-income securities. Among the major differences are that interest and principal payments are made more frequently, usually monthly, and that principal may be prepaid at any time because the underlying mortgage loans generally may be prepaid at any time. As a result, if a Fund purchases these assets (or other asset-backed securities) at a premium, a faster-than-expected prepayment rate will reduce yield to maturity, and a slower-than-expected prepayment rate will increase yield to maturity. If a Fund purchases mortgage-related securities (or other asset-backed securities) at a discount, faster-than-expected prepayments will increase, and slower-than-expected prepayments will reduce, yield to maturity. Prepayments, and resulting amounts available for reinvestment by the Fund are likely to be greater during a period of declining interest rates and, as a result, are likely to be reinvested at lower interest rates. Accelerated prepayments on securities purchased at a premium may result in a loss of principal if the premium has not been fully amortized at the time of prepayment. These securities will decrease in value as a result of increases in interest rates generally, and they are likely to appreciate less than other fixed-income securities when interest rates decline because of the risk of prepayments. In addition, an increase in interest rates would

19

The value of some mortgage-backed and asset-backed securities in which a Fund invests may be particularly sensitive to changes in prevailing interest rates, and the ability of a Fund to successfully utilize these instruments may depend in part upon the ability of Loomis Sayles to forecast interest rates and other economic factors correctly. The risk of non-payment is greater for mortgage-related securities that are backed by mortgage pools that contain “subprime” or “Alt-A” loans (loans made to borrowers with weakened credit histories or with a lower capacity to make timely payments on their loans), but a level of risk exists for all loans. Market factors adversely affecting mortgage loan repayments may include a general economic turndown, high unemployment, a general slowdown in the real estate market, a drop in the market prices of real estate or an increase in interest rates resulting in higher mortgage payments by holders of adjustable-rate mortgages. The market for mortgage-backed securities (and other asset-backed securities) has in recent years experienced high volatility and a lack of liquidity. As a result, the value of many of these securities has significantly declined. There can be no assurance that these markets will become more liquid or less volatile, and it is possible that the value of these securities could decline further.

A mortgage dollar roll involves the sale of a security by a Fund and its agreement to repurchase the instrument at a specified time and price, and may be considered a form of borrowing for some purposes. A Fund will designate assets determined to be liquid in an amount sufficient to meet its obligations under the transactions. A dollar roll involves potential risks of loss that are different from those related to the securities underlying the transactions. A Fund may be required to purchase securities at a higher price than may otherwise be available on the open market. Since the counterparty in the transaction is required to deliver a similar, but not identical, security to a Fund, the security that a Fund is required to buy under the dollar roll may be worth less than an identical security. There is no assurance that a Fund’s use of the cash that it receives from a dollar roll will provide a return that exceeds borrowing costs.

management

Investment Adviser

Loomis Sayles, located at One Financial Center, Boston, Massachusetts 02111, serves as the investment adviser to the Funds. Loomis Sayles is a subsidiary of Natixis US, which is part of Natixis Global Asset Management, an international asset management group based in Paris, France. Founded in 1926, Loomis Sayles is one of the oldest investment firms in the United States with over $186.1 billion in assets under management as of December 31, 2012. Loomis Sayles has an extensive internal research staff. Loomis Sayles is responsible for making investment decisions for each Fund.

As previously described in the “Fund Fees & Expenses” section of the Fund summaries, an investor will either pay a “wrap” fee to the program sponsor and such sponsor will pay a fee to NGAM Advisors, or the investor, such as an institutional client of Loomis Sayles or NGAM Advisors, will pay a fee to Loomis Sayles or NGAM Advisors under a separate client agreement for advisory services. The Funds do not pay Loomis Sayles a monthly investment advisory fee, also known as management fees, for investment advisory services and, except as described below, Loomis Sayles pays the other ordinary expenses of the Funds.

Each Fund is a series of Loomis Sayles Funds I (the “Trust”). The Trust and not Loomis Sayles or its affiliates, will pay the following expenses: taxes payable by the Trust to federal, state or other governmental agencies; extraordinary expenses as may arise, including expenses incurred in connection with litigation, proceedings, other claims and the legal obligations of the Trust or the Funds to indemnify its trustees, officers, employees, shareholders, distributors and agents with respect thereto; brokerage fees and commissions (including dealer markups) and transfer taxes chargeable to the Trust in connection with the purchase and sale of portfolio securities for the Funds; costs, including any interest expenses, of borrowing money; costs of hedging transactions; costs of lending portfolio securities; and any expenses indirectly incurred through investments in other pooled investment vehicles.

A discussion of the factors considered by the Funds’ Board of Trustees in approving the Funds’ investment advisory contracts is available in the Funds’ annual reports for the fiscal year ended September 30, 2012.

Portfolio Managers

The following persons have had primary responsibility for the day-to-day management of each indicated Fund’s portfolio since the date stated below. Except where noted, each portfolio manager has been employed by Loomis Sayles for at least five years.

Ian Anderson has served as portfolio manager of the Loomis Sayles Securitized Asset Fund since 2013. Mr. Anderson, Vice President of Loomis Sayles, has over 11 years of investment management experience and joined Loomis Sayles in 2011. Prior to joining Loomis Sayles, Mr. Anderson served as a senior portfolio manager and an agency CMO trader for Fannie Mae and a research analyst for the Federal Reserve Board of Governors. He earned a B.S. in economics from The University of Chicago and an M.S. in finance from The George Washington University.

Matthew J. Eagan has served as portfolio manager of the Loomis Sayles High Income Opportunities Fund since its inception. Mr. Eagan serves as Vice President and Portfolio Manager of Loomis Sayles. He has over 23 years of investment experience. Mr. Eagan joined Loomis Sayles in 1997. Mr. Eagan earned a B.A. from Northeastern University and an M.B.A. from Boston University and holds the designation of Chartered Financial Analyst.

Daniel J. Fuss has served as portfolio manager of the Loomis Sayles High Income Opportunities Fund since its inception. Mr. Fuss has been at Loomis Sayles since 1976 and is currently a Vice Chairman, Director and Managing Partner. He has over 54 years of investment experience. He earned a B.S. and an M.B.A from Marquette University and holds the designation of Chartered Financial Analyst and Chartered Investment Counselor.

Alessandro Pagani has served as portfolio manager of the Loomis Sayles Securitized Asset Fund since 2010. Mr. Pagani, Vice President of Loomis Sayles, has over 15 years of investment experience and joined Loomis Sayles in 2008. Prior to joining Loomis Sayles, Mr. Pagani served as co-head of global research and credit at Cambridge Place Investment Management and director of asset-backed securities research at Banc One Capital Markets. He earned a doctoral degree in economics and commerce from the University of Brescia in Italy and holds the designation of Chartered Financial Analyst.

Clifton V. Rowe has served as portfolio manager of the Loomis Sayles Securitized Asset Fund since its inception. Mr. Rowe joined Loomis Sayles in 1992 and has over 20 years of investment experience. Prior to serving as a portfolio manager, Mr. Rowe was a trader with Loomis Sayles. Mr. Rowe earned a B.B.A. from James Madison University and an M.B.A. from the University of Chicago. He holds the designation of Chartered Financial Analyst.

Elaine M. Stokes has served as portfolio manager of the Loomis Sayles High Income Opportunities Fund since its inception. Ms. Stokes serves as a Vice President and Portfolio Manager of Loomis Sayles. She has over 26 years of investment experience. Ms. Stokes joined Loomis Sayles in 1988. She earned a B.S. from St. Michael’s College.

Please see the SAI for information regarding portfolio manager compensation, other accounts under management by the portfolio managers and the portfolio managers’ ownership of securities in the Funds.

general information

How Fund Shares Are Priced

“Net asset value” is the price of one share of a Fund without a sales charge, and is calculated each business day using this formula:

The NAV of Fund shares is determined pursuant to policies and procedures approved by the Board of Trustees, as summarized below:

• A share’s NAV is determined at the close of regular trading on the New York Stock Exchange (“NYSE”) on the days the NYSE is open for trading. This is normally 4:00 p.m., Eastern time. A Fund’s shares will not be priced on the days on which the NYSE is closed for trading. In addition, a Fund’s shares will not be priced on the holidays listed in the SAI. See the section “Net Asset Value” in the SAI for more details.
• The price you pay for purchasing, redeeming or exchanging a share will be based upon the NAV next calculated after your order is received by the transfer agent, Boston Financial Data Services, Inc., “in good order” (meaning that the order is complete and contains all necessary information). ¹
• Requests received by the Funds after the NYSE closes will be processed based upon the NAV determined at the close of regular trading on the next day that the NYSE is open. If the transfer agent receives the order in good order prior to market close (normally 4:00 p.m., Eastern time), the shareholder will receive that day’s NAV. Under limited circumstances, NGAM Distribution, L.P. (the “Distributor”) may enter into contractual agreements pursuant to which orders received by your investment dealer before a Fund determines its NAV and transmitted to the transfer agent prior to market open on the next business day are processed at the NAV determined on the day the order was received by your investment dealer. Please contact your investment dealer to determine whether it has entered into such a contractual agreement. If your investment dealer has not entered into such a contractual agreement, your order will be processed at the NAV next determined after your investment dealer submits the order to a Fund.
• If a Fund invests in foreign securities, it may have NAV changes on days when you cannot buy or sell its shares.

1	Please see the section “How to Purchase Shares,” which provides additional information regarding who can receive a purchase order.

Generally, Fund securities are valued as follows:

• Equity securities —last sale price on the exchange or market where primarily traded or, if there is no reported sale during the day, the closing bid price.
• Debt securities (other than short-term obligations) —based upon evaluated prices furnished to a Fund by an independent pricing service, which determines valuations for normal, institutional-size trading units of such securities using market information, transactions for comparable securities and various relationships between securities which are generally recognized by institutional traders, if available, or quotations obtained from broker-dealers.
• Senior Loans —bid prices supplied by an independent pricing service, if available, or quotations obtained from broker-dealers.
• Short-term obligations (purchased with an original or remaining maturity of 60 days or less) —amortized cost (which approximates market value).
• Securities traded on foreign exchanges —market price on the foreign exchange, unless a Fund believes that an occurrence after the close of that exchange will materially affect the security’s value. In that case, the security may be fair-valued at the time the Fund determines its NAV by or pursuant to procedures approved by the Board of Trustees. When fair-valuing their securities, the Funds may, among other things, use modeling tools or other processes that may take into account factors such as securities market activity and/or significant events that occur after the close of the local market and before the time a Fund’s NAV is calculated.
• Swaps —market value based on prices supplied by an independent pricing service, if available, or quotations obtained from broker-dealers.
• Swaptions —mid prices (between the bid price and the ask price) supplied by an independent pricing service, if available, or quotations obtained from broker-dealers.

• Options —domestic exchange-traded single equity option contracts are valued at the mean of the National Best Bid and Offer quotations. Options on futures contracts are valued using the current settlement price. Other exchange-traded options are valued at the average of the closing bid and asked quotations. Currency options are priced at the mid price (between the bid price and the ask price) supplied by an independent pricing service, if available. Over-the-counter options contracts (including currency options not priced through an independent pricing service) are valued based on quotations obtained from broker-dealers.
• Futures —current settlement price.
• Foreign Currency Forward Contracts —interpolated prices determined based on information provided by an independent pricing service.
• All other securities —fair market value as determined by the Adviser of the Fund pursuant to procedures approved by the Board of Trustees.

As described above, if market prices are not readily available for a security, securities may not be priced on the basis of quotations from the primary market in which they are traded but rather may be priced by another method that the Board of Trustees believes is more likely to result in a price that reflects fair value (which is the amount that a Fund might reasonably expect to receive from a current sale of the security in the ordinary course of business). A Fund may also value securities at fair value or estimate their value pursuant to procedures approved by the Board of Trustees in other circumstances such as when extraordinary events occur after the close of the relevant market but prior to the close of the NYSE. This may include situations relating to a single issuer (such as a declaration of bankruptcy or a delisting of the issuer’s security from the primary market on which it has traded) as well as events affecting the securities markets in general (such as market disruptions or closings and significant fluctuations in U.S. and/or foreign markets). Fair value pricing may require subjective determinations about the value of a security, and fair values used to determine a Fund’s NAV may differ from quoted or published prices, or from prices that are used by others, for the same securities. In addition, the use of fair value pricing may not always result in adjustments to the prices of securities held by a Fund.

How to Purchase Shares

Each Fund is generally available for purchase in the United States, Puerto Rico, Guam and the U.S. Virgin Islands. Except to the extent otherwise permitted by the Distributor, the Funds will only accept investments from U.S. citizens with a U.S. address or resident aliens with a U.S. address (including APO/FPO) and a U.S. taxpayer identification number.

Shares of the Funds are offered exclusively to investors in “wrap fee” programs approved by NGAM Advisors and/or Loomis Sayles and to institutional advisory clients of Loomis Sayles or NGAM Advisors that, in each case, meet the Funds’ policies as established by Loomis Sayles.

A purchase order received by the transfer agent prior to the close of regular trading on the NYSE (normally 4:00 p.m., Eastern time), on a day the Funds are open for business, will be effected at that day’s NAV. An order received after the close of regular trading on the NYSE will be effected at the NAV determined on the next business day. The Funds are “open for business” on each day the NYSE is open for trading. Purchase orders will be accepted only on days on which the Funds are open for business.

Additional shares can be purchased if authorized by NGAM Advisors or Loomis Sayles and payment must be wired in federal funds to the transfer agent except when shares are purchased in exchange for securities acceptable to the Fund.

Purchases of a Fund’s shares will normally be made only in full shares, but may be made in fractional shares under certain circumstances. Certificates for shares will not be issued. The payment for shares to be purchased shall be wired to the transfer agent.

Subject to the approval of each Fund, an investor may purchase Institutional Class shares of the Fund with liquid securities and other assets that are eligible for purchase by the Fund (consistent with the Fund’s investment policies and restrictions) and that have a value that is readily ascertainable in accordance with the Fund’s valuation policies. These transactions will be effected only if Loomis Sayles deems the security to be an appropriate investment for a Fund. Assets purchased by a Fund in such a transaction will be valued in accordance with procedures adopted by the Fund. Each Fund reserves the right to amend or terminate this practice at any time.

Please see the section “Restrictions on Buying and Selling Shares” below for more information.

How To Redeem Shares

Shares normally can be redeemed only through the shareholder’s wrap program sponsor for shareholders owning shares through wrap accounts or by contacting Loomis Sayles for non-wrap program shareholders.

Redemption requests for Fund shares are effected at the NAV per share next determined after receipt of a redemption request by the transfer agent in good order. A redemption request received by the transfer agent prior to the close of regular trading on the NYSE, on a day the Funds are open for business, is effected at that day’s NAV. A redemption request received after that time is

24

The Funds and the Distributor reserve the right to redeem shares of any shareholder investing through a wrap program at the then-current value of such shares (which will be paid promptly to the shareholder) if the wrap sponsor is no longer approved by Loomis Sayles or NGAM Advisors. The sponsor will receive advance notice of any such mandatory redemption. Similarly, the Funds and the Distributor may redeem shares of any shareholder who no longer participates in an approved wrap program (for example, by withdrawing from the program). The Funds and the Distributor each reserve the right to redeem any shareholder for which Loomis Sayles or NGAM Advisors ceases to act as investment adviser. In addition, the Funds and the Distributor each reserve the right to redeem any shareholder if the shareholder’s continued investment in the Funds becomes inconsistent with each Fund’s policies, as established by Loomis Sayles.

It is highly unlikely that shares would ever be redeemed in-kind. However, in consideration of the best interests of the remaining investors, each Fund reserves the right to pay any redemption proceeds exceeding this amount in whole or in part by a distribution in-kind of securities held by the Funds in lieu of cash. When shares are redeemed in-kind, the redeeming registered investment adviser should expect to incur transaction costs upon the disposition of the securities received in the distribution. Each Fund agrees to redeem shares solely in cash up to the lesser of $250,000 or 1% of each Fund’s net assets during any 90-day period for any one registered investment adviser.

Generally, a transaction fee will be charged for expedited payment of redemption proceeds of $5.50 for wire transfers or $50 for international wire transfers. These fees are subject to change.

Investments, Risks and Performance

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Below Investment-Grade Fixed-Income Securities Risk is the risk that the Fund’s investments in below investment-grade fixed-income securities may be subject to greater risks than other fixed-income securities, including being subject to greater levels of interest rate risk, credit risk (including a greater risk of default) and liquidity risk. The ability of the issuer to make principal and interest payments is predominantly speculative for below investment-grade fixed-income securities.

Credit Risk is the risk that the issuer or guarantor of a fixed-income security in which the Fund invests, or the counterparty to a derivatives or other transaction will fail financially or otherwise be unwilling or unable to meet their obligations to the Fund.

Currency Risk is the risk that the value of the Fund’s investments will fall as a result of changes in exchange rates. Loomis Sayles may elect not to hedge currency risk or may hedge imperfectly, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged.

Derivatives Risk is the risk that the value of the Fund’s derivative investments, such as forward currency contracts, options and futures transactions and swap transactions will fall, for example, because of changes in the value of the underlying reference instruments, pricing difficulties or lack of correlation with the underlying investments. There is also the risk that the Fund may

Emerging Markets Risk is the risk that the Fund’s investments may face greater foreign securities risk. Investing in companies traded in emerging securities markets, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization and regulatory oversight in emerging market economies is generally less than in more developed markets.

Extension Risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the expected prepayment time, typically reducing the security’s value.

Foreign Securities Risk is the risk that the value of the Fund’s foreign investments will fall as a result of foreign political, social, economic, environmental, credit, informational or currency changes or other issues relating to foreign investing generally. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. The Fund’s investments in foreign securities may be subject to foreign withholding taxes, which would decrease the yield on those securities.

Inflation/Deflation Risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the present value of future payments. Deflation risk is the risk that prices throughout the economy decline over time - the opposite of inflation. Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio.

Interest Rate Risk is the risk that the value of the Fund’s investments will fall if interest rates rise. Interest rate risk generally is greater for funds that invest in fixed-income securities with relatively longer durations than for funds that invest in fixed-income securities with shorter durations. The value of zero-coupon securities and securities with longer maturities are generally more sensitive to fluctuations in interest rates than other fixed-income securities. In addition, an economic downturn or period of rising interest rates could adversely affect the market of these securities and reduce the Fund’s ability to sell them.

Issuer Risk is the risk that the value of securities may decline due to a number of reasons relating to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Leverage Risk is the risk associated with securities or practices (e.g., borrowing and the use of certain derivatives) and investment in certain types of derivatives that multiply small index, market or asset price movements into larger changes in value. Use of derivative instruments may involve leverage. When a derivative is used as a hedge against an offsetting position that the Fund also holds, any loss generated by the derivative should be substantially offset by gains on the hedged instrument, and vice versa. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. Futures and forward currency contracts are derivatives and may be subject to this type of risk.

Liquidity Risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Securities acquired in a private placement, such as Rule 144A securities, generally are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so, or at the most advantageous time or price. Liquidity issues may also make it difficult to value the Fund’s investments.

Management Risk is the risk that Loomis Sayles’ investment techniques will be unsuccessful and cause the Fund to incur losses.

Market Risk is the risk that the market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

Mortgage-Related and Asset-Backed Securities Risk is the risk that the securities may be prepaid and result in the reinvestment of the prepaid amounts in securities with lower yields than the prepaid obligations. Conversely, there is a risk that an unexpected rise in interest rates will extend the life of a mortgage-related or asset-backed security beyond the expected prepayment time, typically reducing the security’s value. The Fund may also incur a loss when there is a prepayment of securities that were purchased at

3

REITs Risk is the risk that the value of the Fund’s investments in REITs will fall as a result of changes in underlying real estate values, rising interest rates, limited diversification of holdings, higher costs and prepayment risk associated with related mortgages, as well as other risks particular to investments in real estate. Many REITs are highly leveraged, increasing their risk. The Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund.

Risk/Return Bar Chart and Table

The following bar chart and table give an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for the one-year, five-year, ten-year and life-of-fund periods compare to those of a broad measure of market performance. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at www.loomissayles.com and/or by calling the Fund toll-free at 800-633-3330.

Total Returns for Institutional Class Shares

The Fund’s best quarter was 15.08%, (second quarter of 2009), and the Fund’s worst quarter was -10.46%, (third quarter of 2008).

Average Annual Total Returns for the periods ended December 31, 2012

	One Year	Five Years	Ten Years	Life-of-Fund (1/17/95) 1
Return Before Taxes	15.65%	8.67%	10.78%	10.24%
Return After Taxes on Distributions	13.59%	6.21%	8.11%	7.31%
Return After Taxes on Distributions and Sale of Fund Shares	10.29%	5.95%	7.78%	7.11%
Barclays U.S. Government/Credit Bond Index	4.82%	6.06%	5.25%	6.71%

¹ The Fund was registered under the Investment Company Act of 1940 (the “1940 Act”) and commenced operations on January 17, 1995. The Fund’s shares were registered under the Securities Act on March 7, 1997.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts. Index performance reflects no deduction for fees, expenses or taxes.

Investments, Risks and Performance

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Below Investment-Grade Fixed-Income Securities Risk is the risk that the Fund’s investments in below investment-grade fixed-income securities may be subject to greater risks than other fixed-income securities, including being subject to greater levels of interest rate risk, credit risk (including a greater risk of default) and liquidity risk. The ability of the issuer to make principal and interest payments is predominantly speculative for below investment-grade fixed-income securities.

Credit Risk is the risk that the issuer or guarantor of a fixed-income security in which the Fund invests, or the counterparty to a derivatives or other transaction will fail financially or otherwise be unwilling or unable to meet their obligations to the Fund.

Currency Risk is the risk that the value of the Fund’s investments will fall as a result of changes in exchange rates. Loomis Sayles may elect not to hedge currency risk or may hedge imperfectly, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged.

Derivatives Risk is the risk that the value of the Fund’s derivative investments such as forward currency contracts, options and futures transactions and swap transactions will fall, for example, because of changes in the value of the underlying reference instruments, pricing difficulties or lack of correlation with the underlying investments. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an advantageous time or price. Moreover, a number of broker-dealers and other financial institutions have recently experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance that the Fund’s derivative counterparties will not experience similar financial difficulties,

7

Emerging Markets Risk is the risk that the Fund’s investments may face greater foreign securities risk. Investing in companies traded in emerging securities markets, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization and regulatory oversight in emerging market economies is generally less than in more developed markets.

Extension Risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the expected prepayment time, typically reducing the security’s value.

Foreign Securities Risk is the risk that the value of the Fund’s foreign investments will fall as a result of foreign political, social, economic, environmental, credit, informational or currency changes or other issues relating to foreign investing generally. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. The Fund’s investments in foreign securities may be subject to foreign withholding taxes, which would decrease the yield on those securities.

Interest Rate Risk is the risk that the value of the Fund’s investments will fall if interest rates rise. Interest rate risk generally is greater for funds that invest in fixed-income securities with relatively longer durations than for funds that invest in fixed-income securities with shorter durations. The value of zero-coupon securities and securities with longer maturities are generally more sensitive to fluctuations in interest rates than other fixed-income securities. In addition, an economic downturn or period of rising interest rates could adversely affect the market of these securities and reduce the Fund’s ability to sell them.

Issuer Risk is the risk that the value of securities may decline due to a number of reasons relating to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Leverage Risk is the risk associated with securities or practices (e.g., borrowing and the use of certain derivatives) and investment in certain types of derivatives that multiply small index, market or asset price movements into larger changes in value. Use of derivative instruments may involve leverage. When a derivative is used as a hedge against an offsetting position that the Fund also holds, any loss generated by the derivative should be substantially offset by gains on the hedged instrument, and vice versa. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. Futures and forward currency contracts are derivatives and may be subject to this type of risk.

Liquidity Risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Securities acquired in a private placement, such as Rule 144A securities, generally are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so, or at the most advantageous time or price. Liquidity issues may also make it difficult to value the Fund’s investments.

Management Risk is the risk that Loomis Sayles’ investment techniques will be unsuccessful and cause the Fund to incur losses.

Market Risk is the risk that the market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

Mortgage-Related and Asset-Backed Securities Risk is the risk that the securities may be prepaid and result in the reinvestment of the prepaid amounts in securities with lower yields than the prepaid obligations. Conversely, there is a risk that an unexpected rise in interest rates will extend the life of a mortgage-related or asset-backed security beyond the expected prepayment time, typically reducing the security’s value. The Fund may also incur a loss when there is a prepayment of securities that were purchased at a premium. It also includes risks associated with investing in the mortgages underlying the mortgage-backed securities. The market for mortgage-backed securities (and other asset-backed securities) has experienced high volatility and a lack of liquidity. As a result, the value of many of these securities has significantly declined. The Fund’s investments in other asset-backed securities are subject to risks similar to those associated with mortgage-related securities, as well as additional risks associated with the nature of the assets and the servicing of those assets.

REITs Risk is the risk that the value of the Fund’s investments in REITs will fall as a result of changes in underlying real estate values, rising interest rates, limited diversification of holdings, higher costs and prepayment risk associated with related mortgages, as well as other risks particular to investments in real estate. Many REITs are highly leveraged, increasing their risk. The Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund.

Risk/Return Bar Chart and Table

The following bar chart and table give an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for the one-year, five-year, ten-year and life-of-fund periods compare to those of a broad measure of market performance. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at www.loomissayles.com and/or by calling the Fund toll-free at 800-633-3330.

Total Returns for Institutional Class Shares

The Fund’s best quarter was 20.00%, (second quarter of 2009), and the Fund’s worst quarter was -16.57%, (fourth quarter of 2008).

Average Annual Total Returns for the periods ended December 31, 2012

	One Year	Five Years	Ten Years	Life-of-Fund (6/5/96) 1
Return Before Taxes	17.98%	9.01%	12.84%	8.57%
Return After Taxes on Distributions	15.37%	5.83%	9.81%	4.85%
Return After Taxes on Distributions and Sale of Fund Shares	11.85%	5.81%	9.47%	4.92%
Barclays U.S. Corporate High-Yield Bond Index	15.81%	10.34%	10.62%	7.71%

1	The Fund was registered under the Investment Company Act of 1940 (the “1940 Act”) and commenced operations on June 5, 1996. The Fund’s shares were registered under the Securities Act of 1933 on March 7, 1997.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts. Index performance reflects no deduction for fees, expenses or taxes.

Investments, Risks and Performance

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Below Investment-Grade Fixed-Income Securities Risk is the risk that the Fund’s investments in below investment-grade fixed-income securities may be subject to greater risks than other fixed-income securities, including being subject to greater levels of interest rate risk, credit risk (including a greater risk of default) and liquidity risk. The ability of the issuer to make principal and interest payments is predominantly speculative for below investment-grade fixed-income securities.

Credit Risk is the risk that the issuer or guarantor of a fixed-income security in which the Fund invests, or the counterparty to a derivatives or other transaction will fail financially or otherwise be unwilling or unable to meet their obligations to the Fund.

Currency Risk is the risk that the value of the Fund’s investments will fall as a result of changes in exchange rates. Loomis Sayles may elect not to hedge currency risk or may hedge imperfectly, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged.

Derivatives Risk is the risk that the value of the Fund’s derivative investments such as structured notes, futures transactions and swap transactions will fall, for example, because of changes in the value of the underlying reference instruments, pricing difficulties or lack of correlation with the underlying investments. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an advantageous time or price. Moreover, a number of broker-dealers and other financial institutions have recently experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance

12

Emerging Markets Risk is the risk that the Fund’s investments may face greater foreign securities risk. Investing in companies traded in emerging securities markets, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization and regulatory oversight in emerging market economies is generally less than in more developed markets.

Extension Risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the expected prepayment time, typically reducing the security’s value.

Foreign Securities Risk is the risk that the value of the Fund’s foreign investments will fall as a result of foreign political, social, economic, environmental, credit, informational or currency changes or other issues relating to foreign investing generally. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. The Fund’s investments in foreign securities may be subject to foreign withholding taxes, which would decrease the yield on those securities.

Inflation/Deflation Risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the present value of future payments. Deflation risk is the risk that prices throughout the economy decline over time - the opposite of inflation. Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of the Fund’s portfolio.

Interest Rate Risk is the risk that the value of the Fund’s investments will fall if interest rates rise. Interest rate risk generally is greater for funds that invest in fixed-income securities with relatively longer durations than for funds that invest in fixed-income securities with shorter durations. The value of zero-coupon securities and securities with longer maturities are generally more sensitive to fluctuations in interest rates than other fixed-income securities. In addition, an economic downturn or period of rising interest rates could adversely affect the market of these securities and reduce the Fund’s ability to sell them.

Issuer Risk is the risk that the value of securities may decline due to a number of reasons relating to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Leverage Risk is the risk associated with securities or practices (e.g., borrowing and the use of certain derivatives) and investment in certain types of derivatives that multiply small index, market or asset price movements into larger changes in value. Use of derivative instruments may involve leverage. When a derivative is used as a hedge against an offsetting position that the Fund also holds, any loss generated by the derivative should be substantially offset by gains on the hedged instrument, and vice versa. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. Futures are derivatives and may be subject to this type of risk.

Liquidity Risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Securities acquired in a private placement, such as Rule 144A securities, generally are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so, or at the most advantageous time or price. Liquidity issues may also make it difficult to value the Fund’s investments.

Management Risk is the risk that Loomis Sayles’ investment techniques will be unsuccessful and cause the Fund to incur losses.

Market Risk is the risk that the market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

Mortgage-Related Securities Risk is the risk that the securities may be prepaid and result in the reinvestment of the prepaid amounts in securities with lower yields than the prepaid obligations. Conversely, there is a risk that an unexpected rise in interest rates will extend the life of a mortgage-related or asset-backed security beyond the expected prepayment time, typically reducing the security’s value. The Fund may also incur a loss when there is a prepayment of securities that were purchased at a premium. It also includes risks associated with investing in the mortgages underlying the mortgage-backed securities. The market for mortgage-backed securities (and other asset-backed securities) has experienced high volatility and a lack of liquidity. As a result, the value of many of these securities has significantly declined.

REITs Risk is the risk that the value of the Fund’s investments in REITs will fall as a result of changes in underlying real estate values, rising interest rates, limited diversification of holdings, higher costs and prepayment risk associated with related mortgages, as well as other risks particular to investments in real estate. Many REITs are highly leveraged, increasing their risk. The Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund.

Risk/Return Bar Chart and Table

The following bar chart and table give an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for the one-year, five-year, ten-year and life-of-fund periods compare to those of a broad measure of market performance. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at www.loomissayles.com and/or by calling the Fund toll-free at 800-633-3330.

Total Returns for Institutional Class Shares

The Fund’s best quarter was 11.98%, (second quarter of 2003), and the Fund’s worst quarter was -7.61%, (third quarter of 2008).

Average Annual Total Returns for the periods ended December 31, 2012

	One Year	Five Years	Ten Years	Life-of-Fund (7/1/94) 1
Return Before Taxes	12.89%	8.49%	9.74%	9.89%
Return After Taxes on Distributions	10.95%	5.90%	7.02%	6.95%
Return After Taxes on Distributions and Sale of Fund Shares	8.51%	5.79%	6.88%	6.82%
Barclays U.S. Government/Credit Bond Index	4.82%	6.06%	5.25%	6.61%

1	The Fund was registered under the Investment Company Act of 1940 (the “1940 Act”) and commenced operations on July 1, 1994. The Fund’s shares were registered under the Securities Act on March 7, 1997.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts such as 529 plans or individual retirement accounts. Index performance reflects no deduction for fees, expenses or taxes.

Below Investment-Grade Fixed-Income Securities Risk

Below investment-grade fixed-income securities, also known as “junk bonds,” are rated below investment-grade quality and may be considered speculative with respect to the issuer’s continuing ability to make principal and interest payments. To be considered rated below investment-grade quality, none of the three major rating agencies (Moody’s Investors Service, Inc., Fitch Investor Services, Inc. or Standard & Poor’s Ratings Group) must have rated the security in one of their respective top four rating categories at the time a Fund acquires the security or, if the security is unrated, Loomis Sayles must have determined it to be of comparable quality. Analysis of the creditworthiness of issuers of below investment-grade securities may be more complex than for issuers of higher-quality debt securities, and the Fund’s ability to achieve its investment objectives may, to the extent the Fund invests in below investment-grade securities, be more dependent upon Loomis Sayles’ credit analysis than would be the case if the Fund were investing in higher-quality securities. The issuers of these securities may be in default or have a currently identifiable vulnerability to default on their payments of principal and interest, or may otherwise present elements of danger with respect to payments of principal or interest. However, a Fund will not invest in securities that are in default as to payment of principal and interest at the time of purchase, but may continue to hold securities that go into default after purchase.

Below investment-grade securities may be more susceptible to real or perceived adverse economic and competitive industry conditions than higher-grade securities. Yields on below investment-grade securities will fluctuate. If the issuer of below investment-grade securities defaults, a Fund may incur additional expenses to seek recovery.

The secondary markets in which below investment-grade securities are traded may be less liquid than the market for higher-grade securities. A lack of liquidity in the secondary trading markets could adversely affect the price at which the Fund could sell a particular below investment-grade security when necessary to meet liquidity needs or in response to a specific economic event, such as a deterioration in the creditworthiness of the issuer, and could adversely affect and cause large fluctuations in the net asset value (“NAV”) of a Fund’s shares. Adverse publicity and investor perceptions may decrease the values and liquidity of high yield securities generally.

It is reasonable to expect that any adverse economic conditions could disrupt the market for below investment-grade securities, have an adverse impact on the value of such securities and adversely affect the ability of the issuers of such securities to repay principal and pay interest thereon. New laws and proposed new laws may adversely impact the market for below investment-grade securities.

Credit Risk

This is the risk that the issuer or the guarantor of a fixed-income security, the issuer or guarantor of a security backing the asset-backed securities in which a Fund invests, or the counterparty to a derivatives or an over-the-counter transaction will be unable or unwilling to make timely payments of interest or principal or to otherwise honor its obligations. Each Fund will be subject to credit risk to the extent that it invests in fixed-income securities or is a party to derivatives or over-the-counter transactions.

A Fund that invests in below investment-grade fixed-income securities is subject to greater credit risk (because such securities are subject to a greater risk of default) and market risk than funds that invest in higher quality fixed-income securities. Below investment-grade fixed-income securities are considered predominantly speculative with respect to the ability of the issuer to make timely principal and interest payments.

The Funds’ investments in securities issued by U.S. government agencies are subject to credit risk. Agencies of the U.S. government are guaranteed as to payment of principal and interest of the relevant entity but are not backed by the full faith and credit of the U.S. government. An event affecting the guaranteeing entity could adversely affect the payment of principal or interest or both on the security, and therefore, these types of securities should be considered to be riskier than U.S. government securities.

A Fund that invests in fixed-income securities issued in connection with corporate restructurings by highly leveraged issuers or in fixed-income securities that are not current in the payment of interest or principal ( i.e. , in default) will be subject to greater credit risk.

A Fund that invests in foreign securities is subject to increased credit risk, because, for example, of the difficulties of requiring foreign entities to honor their contractual commitments and because a financial reporting and other standards are often less robust in foreign countries.

Currency Risk

This is the risk that fluctuations in exchange rates between the U.S. dollar and foreign currencies or between two or more foreign currencies may cause the value of a Fund’s investments to decline. The Funds are subject to currency risk because they may invest in securities or other instruments denominated in, or receive revenues in, foreign currency. Loomis Sayles may elect not to hedge currency risk or may hedge imperfectly, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged. The market for some (or all) currencies may from time to time have low trading volume and become illiquid, which may prevent a Fund from effecting positions or from promptly liquidating unfavorable positions in such markets, thus subjecting the Fund to substantial losses.

Derivatives Risk

As described herein and in the SAI, the use of derivatives involves special risks. To the extent that a Fund uses a derivative security for purposes other than as a hedge, or if a Fund hedges imperfectly, a Fund is directly exposed to the risks of that derivative security and any loss generated by the derivative security will not be offset by a gain. A Fund may also use derivatives for leverage, which increases opportunities for gain but also involves greater risk of loss due to leverage risk, and to earn income, enhance yield or broaden the Fund’s diversification by gaining exposure to issuers, indices, sectors, currencies and/or geographic regions. The use of derivatives for these purposes entails greater risk than using derivatives solely for hedging purposes.

Funds that use derivatives also face additional risks, such as liquidity risk, market risk, management risk, the credit risk relating to the other party to a derivative contract (which is greater for forward currency contracts, swaps and other over-the-counter derivatives), the risk of difficulties in pricing and valuation, the risk of ambiguous documentation and the risk that changes in the value of a derivative may not correlate perfectly with relevant assets, rates or indices. This could, for example, cause a derivative transaction to imperfectly hedge the risk which it was intended to hedge. A Fund’s use of derivative instruments may involve risks greater than the risks associated with investing directly in securities and other traditional investments, may cause the Fund to lose more than the principal amount invested and may subject a Fund to the potential for unlimited loss. A Fund may be required to sell other securities at inopportune times to meet collateral requirements on its derivatives transactions. In addition, a Fund’s use of derivatives may increase or accelerate the amount of taxes payable by shareholders. Also, suitable derivative transactions may not be available in all circumstances and there can be no assurance that a Fund will engage in these transactions to reduce exposure to other risks when that would be beneficial or that, if used, such strategies will be successful.

Recently, several broker-dealers and other financial institutions have experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance that the Fund’s counterparties will not experience similar difficulties, possibly resulting in losses to the Fund. Losses resulting from the use of derivatives will reduce the Fund’s NAV, and possibly income, and the losses may be significantly greater than if derivatives had not been used. When used, derivatives may increase the amount and affect the timing and character of taxes payable by shareholders.

Emerging Markets Risk

Economic and Political Risks. Emerging market countries often experience instability in their political and economic structures and have less market depth, infrastructure, capitalization and regulatory oversight than more developed markets. Government actions could have a significant impact on the economic conditions in such countries, which in turn would affect the value and liquidity of the assets of a Fund invested in emerging market securities. Specific risks that could decrease a Fund’s return include seizure of a company’s assets, restrictions imposed on payments as a result of blockages on foreign currency exchanges and unanticipated social or political occurrences.

The ability of the government of an emerging market country to make timely payments on its debt obligations will depend on many factors, including the extent of its reserves, fluctuations in interest rates and access to international credit and investments. A country that has non-diversified exports or relies on certain key imports will be subject to greater fluctuations in the pricing of those commodities. Failure to generate sufficient earnings from foreign trade will make it difficult for an emerging market country to service its foreign debt.

Companies trading in developing securities markets are generally smaller and have shorter operating histories than companies trading in developed markets. Foreign investors may be required to register the proceeds of sales. Settlement of securities transactions in emerging markets may be subject to risk of loss and may be delayed more often than transactions settled in the United States. Disruptions resulting from social and political factors may cause the securities markets to close. If extended closings were to occur, the liquidity and value of the Fund’s assets invested in corporate debt obligations of emerging market companies would decline.

Investment Controls; Repatriation. Foreign investment in emerging market country debt securities is restricted or controlled to varying degrees. These restrictions may at times limit or preclude foreign investment in certain emerging market country debt securities. Certain emerging market countries require government approval of investments by foreign persons, limit the amount of investments by foreign persons in a particular issuer, limit investments by foreign persons only to a specific class of securities of an issuer that may have less advantageous rights than the classes available for purchase by domiciliaries of the countries and/or impose additional taxes or controls on foreign investors or currency transactions. Certain emerging market countries may also restrict investment opportunities in issuers in industries deemed important to national interests.

Emerging market countries may require governmental approval for the repatriation of investment income, capital or proceeds of sale of securities by foreign investors. In addition, if a deterioration occurs in an emerging market country’s balance of payments, the country could impose temporary restrictions on foreign capital remittances. A Fund could be adversely affected by delays in, or a refusal to grant, any required governmental approval for repatriation of capital, as well as by the application to a Fund of any restrictions on investments. Investing in local markets in emerging market countries may require a Fund to adopt special procedures, seek local governmental approvals or take other actions, each of which may involve additional costs to a Fund.

Foreign Securities Risk

This is the risk associated with investments in issuers that are located or do business in foreign countries. A Fund’s investments in foreign securities may be less liquid and may experience more rapid and extreme changes in value than investments in securities of U.S. issuers.

The securities markets of many foreign countries are relatively small, with a limited number of issuers and a small number of securities. In addition, foreign companies often are not subject to the same degree of regulation as U.S. companies. Reporting, accounting and auditing standards of foreign countries differ, in some cases significantly, from U.S. standards. Among other things, nationalization, expropriation or confiscatory taxation, currency blockage, political changes or diplomatic developments can cause the value of a Fund’s investments in a foreign country to decline. In the event of nationalization, expropriation or other confiscation, a Fund could lose its entire foreign investment. These risks also apply to securities of foreign issuers traded in the United States or through depositary receipt programs such as American Depositary Receipts.

A Fund that invests in emerging markets may face greater foreign risk since emerging market countries may be more likely to experience political and economic instability. See “Emerging Markets Risk.”

Inflation/Deflation Risk

Inflation risk is the risk that the value of assets or income from investments will be worth less in the future as inflation decreases the present value of future payments. Deflation risk is the risk that prices throughout the economy decline over time (the opposite of inflation). Deflation may have an adverse effect on the creditworthiness of issuers and may make issuer default more likely, which may result in a decline in the value of a Fund’s portfolio.

Interest Rate Risk

This is the risk that changes in interest rates will affect the value of a Fund’s investments in fixed-income securities, such as bonds, notes, asset-backed securities and other income-producing securities and derivatives. Fixed-income securities are obligations of the issuer to make payments of principal and/or interest on future dates. Increases in interest rates may cause the value of a Fund’s investments to decline.

Even Funds that generally invest a significant portion of their assets in high quality fixed-income securities are subject to interest rate risk. Interest rate risk is greater for funds that generally invest a significant portion of their assets in below investment-grade fixed-income securities (commonly known as “junk bonds”) or comparable unrated securities. Interest rate risk also is greater for funds that generally invest in fixed-income securities with longer maturities or durations than for funds that invest in fixed-income securities with shorter maturities or durations.

Interest rate risk is compounded for Funds when they invest a significant portion of their assets in mortgage-related or asset-backed securities because the value of mortgage-related and asset-backed securities generally is more sensitive to changes in interest rates than other types of fixed-income securities. When interest rates rise, the maturities of mortgage-related and asset-backed securities tend to lengthen, and the value of these securities decreases more significantly than the value of other types of securities. In addition, these types of securities are subject to the risk of prepayment when interest rates fall, which generally results in lower returns because Funds that hold these types of securities must reinvest assets previously invested in these types of securities in fixed-income securities with lower interest rates. Funds also face increased interest rate risk when they invest in fixed-income securities paying no current interest (such as zero-coupon securities and principal-only securities) interest-only securities and fixed-income securities paying non-cash interest in the form of other fixed-income securities because the prices of those types of securities tend to react more to changes in interest rates.

Issuer Risk

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

Leverage Risk

When a Fund borrows money or otherwise leverages its portfolio, the value of an investment in the Fund will be more volatile, and all other risks are generally compounded. Funds face this risk if they create leverage by using investments such as reverse repurchase agreements, inverse floating-rate instruments or derivatives, or by borrowing money. The use of leverage may lead to losses that are greater than if the Fund had not used leverage.

Liquidity Risk

Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing a Fund from selling these illiquid securities at the price or at the time desired. Liquidity issues could also make it difficult to value a Fund’s investments, which could also negatively impact NAV. An unrated security may be less liquid than a comparable rated security and involves the risk that Loomis Sayles may not accurately evaluate the security’s comparative credit rating. Derivatives and securities that involve substantial interest rate or credit risk tend to involve greater liquidity risk. In addition, liquidity risk tends to increase to the extent a Fund invests in securities whose sale may be restricted by law or by contract, such as Rule 144A securities. Investment in derivatives may be less liquid when compared to other investments, especially during periods of market stress.

Management Risk

Management risk is the risk that Loomis Sayles’ investment techniques could fail to achieve a Fund’s objective and could cause your investment in a Fund to lose value. Each Fund is subject to management risk because each Fund is actively managed by Loomis Sayles. Loomis Sayles will apply its investment techniques and risk analyses in making investment decisions for each Fund, but there can be no guarantee that Loomis Sayles’ decisions will produce the desired results. For example, securities that Loomis Sayles expects may appreciate in value may in fact decline. Similarly, in some cases derivative and other investment techniques may be unavailable or Loomis Sayles may decide not to use them, even under market conditions where their use could have benefited a Fund.

Market Risk

This is the risk that the value of a Fund’s investments will change as financial markets fluctuate and that prices overall may decline. The value of a company’s securities may fall as a result of factors that directly relate to that company, such as decisions made by its management or lower demand for the company’s products or services. A security’s value also may fall because of factors affecting not just the issuer of a security, but companies in its industry or in a number of different industries, such as increases in production costs. The value of a company’s securities also may be affected by changes in financial market or other economic conditions, such as changes in interest rates or currency exchange rates. In addition, a company’s stock generally pays

24

Market risk generally is greater for funds that invest substantially in small and medium-sized companies, since these companies tend to be more vulnerable to adverse developments than large companies. Furthermore, for funds that invest in fixed-income securities, market risk tends to be greater when a Fund invests in fixed-income securities with longer maturities.

Mortgage-Related and Asset-Backed Securities Risk

Mortgage-related securities, such as Government National Mortgage Association certificates or securities issued by the Federal National Mortgage Association, differ from traditional debt securities. Among the major differences are that interest and principal payments are made more frequently, usually monthly, and that principal may be prepaid at any time because the underlying mortgage loans generally may be prepaid at any time. As a result, if a Fund purchases these assets (or other asset-backed securities) at a premium, a faster-than-expected prepayment rate will reduce yield to maturity, and a slower-than-expected prepayment rate will increase yield to maturity. If a Fund purchases mortgage-related securities (or other asset-backed securities) at a discount, faster-than-expected prepayments will increase and slower-than-expected prepayments tend to reduce, yield to maturity. Prepayments and resulting amounts available for reinvestment by the Fund are likely to be greater during a period of declining interest rates and, as a result, are likely to be reinvested at lower interest rates. Accelerated prepayments on securities purchased at a premium may result in a loss of principal if the premium has not been fully amortized at the time of prepayment. These securities will decrease in value as a result of increases in interest rates generally, and they are likely to appreciate less than other fixed-income securities when interest rates decline because of the risk of prepayments. In addition, an increase in interest rates would give rise to extension risk by extending the life of a mortgage- or asset-backed security beyond the expected prepayment time, typically reducing the security’s value. It would also increase the inherent volatility of the Fund by increasing the average life of the Fund’s portfolio securities.

The value of some mortgage-backed and asset-backed securities in which a Fund invests may be particularly sensitive to changes in prevailing interest rates, and the ability of a Fund to successfully utilize these instruments may depend in part upon the ability of Loomis Sayles to forecast interest rates and other economic factors correctly. The risk of non-payment is greater for mortgage-related securities that are backed by mortgage pools that contain “subprime” or “Alt-A” loans (loans made to borrowers with weakened credit histories or with a lower capacity to make timely payments on their loans), but a level of risk exists for all loans. Market factors adversely affecting mortgage loan repayments may include a general economic turndown, high unemployment, a general slowdown in the real estate market, a drop in the market prices of real estate or an increase in interest rates resulting in higher mortgage payments by holders of adjustable-rate mortgages. The market for mortgage-backed securities (and other asset-backed securities) has in recent years experienced high volatility and a lack of liquidity. As a result, the value of many of these securities has significantly declined. There can be no assurance that these markets will become more liquid or less volatile, and it is possible that the value of these securities could decline further.

A mortgage dollar roll involves the sale of a security by a Fund and its agreement to repurchase the instrument at a specified time and price, and may be considered a form of borrowing for some purposes. A Fund will designate assets determined to be liquid in an amount sufficient to meet its obligations under the transactions. A dollar roll involves potential risks of loss that are different from those related to the securities underlying the transactions. A Fund may be required to purchase securities at a higher price than may otherwise be available on the open market. Since the counterparty in the transaction is required to deliver a similar, but not identical, security to a Fund, the security that a Fund is required to buy under the dollar roll may be worth less than an identical security. There is no assurance that a Fund’s use of the cash that it receives from a dollar roll will provide a return that exceeds borrowing costs.

REITs Risk

The real estate industry is particularly sensitive to economic downturns. Securities of companies in the real estate industry, including REITs, are sensitive to factors such as changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents, and the management skill and creditworthiness of the issuer. Companies in the real estate industry may also be subject to liabilities under environmental and hazardous waste laws. In addition, the value of a REIT is affected by changes in the value of the properties owned by the REIT or securing mortgage loans held by the REIT. REITs are also subject to default and prepayment risk. REITs are dependent upon cash flow from their investments to repay financing costs and also on the ability of the REITs’ managers. The Fund will indirectly

25

REITs may have limited financial resources, may trade less frequently and in a limited volume, and may be subject to more abrupt or erratic price movements than more widely-held securities.

A Fund’s investment in a REIT may require the Fund to accrue and distribute income not yet received or may result in the Fund making distributions that constitute a return of capital to Fund shareholders for U.S. federal income tax purposes. In addition, distributions by a Fund from REITs will not qualify for the corporate dividends-received deduction or, generally, for treatment as qualified dividend income.

management

Investment Adviser

Loomis Sayles, located at One Financial Center, Boston, Massachusetts 02111, serves as the investment adviser to the Funds. Loomis Sayles is a subsidiary of Natixis US, which is part of Natixis Global Asset Management, an international asset management group based in Paris, France. Founded in 1926, Loomis Sayles is one of the oldest investment firms in the United States with over $186.1 billion in assets under management as of December 31, 2012. Loomis Sayles has an extensive internal research staff. Loomis Sayles is responsible for making investment decisions for each Fund.

The aggregate advisory fees paid by the Funds during the fiscal year ended September 30, 2012, as a percentage of each Fund’s average daily net assets were:

A discussion of the factors considered by the Funds’ Board of Trustees in approving the Funds’ investment advisory contracts is available in the Funds’ annual reports for the fiscal year ended September 30, 2012.

Portfolio Managers

The following persons have had primary responsibility for the day-to-day management of each indicated Fund’s portfolio since the date stated below. Associate portfolio managers are actively involved in formulating the overall strategy for the funds they manage but are not the primary decision-makers. Each portfolio manager has been employed by Loomis Sayles for at least five years.

Matthew J. Eagan has served as portfolio manager of the Loomis Sayles Investment Grade Fixed Income Fund, Loomis Sayles Fixed Income Fund and the Loomis Sayles Institutional High Income Fund since 2012. He served as an associate portfolio manager of the Loomis Sayles Investment Grade Fixed Income Fund from September 2006 until February 2012 and the Loomis Sayles Fixed Income Fund and the Loomis Sayles Institutional High Income Fund from February 2007 to February 2012. Mr. Eagan, Vice President of Loomis Sayles, began his investment career in 1989 and joined Loomis Sayles in 1997. He earned a B.A. from Northeastern University and an M.B.A. from Boston University. Mr. Eagan holds the designation of Chartered Financial Analyst and has over 23 years of investment experience.

Daniel J. Fuss has served as portfolio manager of the Loomis Sayles Fixed Income Fund, Loomis Sayles Institutional High Income Fund and the Loomis Sayles Investment Grade Fixed Income Fund since the inception of each Fund. Mr. Fuss is Vice Chairman, Director and Managing Partner of Loomis Sayles. He began his investment career in 1958 and has been at Loomis Sayles since 1976. Mr. Fuss holds the designation of Chartered Financial Analyst and Chartered Investment Counselor. He earned a B.S. and an M.B.A. from Marquette University and has over 54 years of investment experience.

Brian P. Kennedy has served as portfolio manager of the Loomis Sayles Investment Grade Fixed Income Fund since 2013. Mr. Kennedy is a vice president and portfolio manager of Loomis Sayles. He began his investment industry career in 1990 and joined Loomis Sayles in 1994 as a structured finance and government bond trader, then a credit trader in 2001 and a product manager in 2009. He earned a B.S. from Providence College and an M.B.A. from Babson College and has over 22 years of investment experience.

Elaine M. Stokes has served as portfolio manager of the Loomis Sayles Investment Grade Fixed Income Fund, Loomis Sayles Fixed Income Fund and the Loomis Sayles Institutional High Income Fund since 2012. She served as an associate portfolio manager of the Loomis Sayles Investment Grade Fixed Income Fund from September 2006 until February 2012 and the Loomis Sayles Fixed Income Fund and the Loomis Sayles Institutional High Income Fund from February 2007 to February 2012. Ms. Stokes, Vice President of Loomis Sayles, began her investment career in 1987 and joined Loomis Sayles in 1988. She earned a B.S. from St. Michael’s College and has over 25 years of investment experience.

Please see the SAI for information regarding portfolio manager compensation, other accounts under management by the portfolio managers and the portfolio managers’ ownership of securities in the Funds.

Other Fees

NGAM Distribution, L.P. (the “Distributor”), on behalf of Loomis Sayles, may pay certain broker-dealers and financial intermediaries whose customers are existing shareholders of the Funds a continuing fee at an annual rate of up to 0.35% of the value of Fund shares held for these customers’ accounts, although this continuing fee is paid by the Distributor, on behalf of Loomis Sayles, out of Loomis Sayles’ own resources and is not assessed against the Fund.

The Distributor may pay fees to third party broker-dealer firms for services provided by those firms. The fees vary by firm and are generally based on asset levels. Fees are paid by the Distributor (as distributor of the Funds) on behalf of Loomis Sayles, out of Loomis Sayles’ own resources.

general information

How Fund Shares Are Priced

NAV is the price of one share of a Fund without a sales charge, and is calculated each business day using this formula:

The NAV of Fund shares is determined pursuant to policies and procedures approved by the Board of Trustees, as summarized below:

• A share’s NAV is determined at the close of regular trading on the New York Stock Exchange (“NYSE”) on the days the NYSE is open for trading. This is normally 4:00 p.m., Eastern time. A Fund’s shares will not be priced on the days on which the NYSE is closed for trading. In addition, a Fund’s shares will not be priced on the holidays listed in the SAI. See the section “Net Asset Value” in the SAI for more details.
• The price you pay for purchasing, redeeming or exchanging a share will be based upon the NAV next calculated after your order is received by the transfer agent, Boston Financial Data Services, Inc., “in good order” (meaning that the order is complete and contains all necessary information). ¹
• Requests received by the Funds after the NYSE closes will be processed based upon the NAV determined at the close of regular trading on the next day that the NYSE is open. If the transfer agent receives the order in good order prior to market close (normally 4:00 p.m., Eastern time), the shareholder will receive that day’s NAV. Under limited circumstances, the Distributor may enter into contractual agreements pursuant to which orders received by your investment dealer before a Fund determines its NAV and transmitted to the transfer agent prior to market open on the next business day are processed at the NAV determined on the day the order was received by your investment dealer. Please contact your investment dealer to determine whether it has entered into such a contractual agreement. If your investment dealer has not entered into such a contractual agreement, your order will be processed at the NAV next determined after your investment dealer submits the order to a Fund.
• If a Fund invests in foreign securities, it may have NAV changes on days when you cannot buy or sell its shares.

1	Please see the section “How to Purchase Shares,” which provides additional information regarding who can receive a purchase order.

Generally, during times of substantial economic or market change, it may be difficult to place your order by phone. During these times, you may send your order by mail as described in the sections “How to Purchase Shares” and “How to Redeem Shares.”

Generally, Fund securities are valued as follows:

• Equity securities —last sale price on the exchange or market where primarily traded or, if there is no reported sale during the day, the closing bid price.
• Debt securities (other than short-term obligations) —based upon evaluated prices furnished to a Fund by an independent pricing service, which determines valuations for normal, institutional-size trading units of such securities using market information, transactions for comparable securities and various relationships between securities which are generally recognized by institutional traders, if available, or quotations obtained from broker-dealers.
• Senior Loans —bid prices supplied by an independent pricing service, if available, or quotations obtained from broker-dealers.
• Short-term obligations (purchased with an original or remaining maturity of 60 days or less) —amortized cost (which approximates market value).
• Securities traded on foreign exchanges —market price on the foreign exchange, unless a Fund believes that an occurrence after the close of that exchange will materially affect the security’s value. In that case, the security may be fair-valued at the time the Fund determines its NAV by or pursuant to procedures approved by the Board of Trustees. When fair-valuing their securities, the Funds may, among other things, use modeling tools or other processes that may take into account factors such as securities market activity and/or significant events that occur after the close of the local market and before the time a Fund’s NAV is calculated.
• Swaps —market value based on prices supplied by an independent pricing service, if available, or quotations obtained from broker-dealers.

• Swaptions —mid prices (between the bid price and the ask price) supplied by an independent pricing service, if available, or quotations obtained from broker-dealers.
• Options —domestic exchange-traded single equity option contracts are valued at the mean of the National Best Bid and Offer quotations. Options on futures contracts are valued using the current settlement price. Other exchange-traded options are valued at the average of the closing bid and asked quotations. Currency options are priced at the mid price (between the bid price and the ask price) supplied by an independent pricing service, if available. Over-the-counter options contracts (including currency options not priced through an independent pricing service) are valued based on quotations obtained from broker-dealers.
• Futures —current settlement price.
• Foreign Currency Forward Contracts —interpolated prices determined based on information provided by an independent pricing service.
• All other securities —fair market value as determined by the Adviser of the Fund pursuant to procedures approved by the Board of Trustees.

As described above, if market prices are not readily available for a security, securities may not be priced on the basis of quotations from the primary market in which they are traded but rather may be priced by another method that the Board of Trustees believes is more likely to result in a price that reflects fair value (which is the amount that a Fund might reasonably expect to receive from a current sale of the security in the ordinary course of business). A Fund may also value securities at fair value or estimate their value pursuant to procedures approved by the Board of Trustees in other circumstances such as when extraordinary events occur after the close of the relevant market but prior to the close of the NYSE. This may include situations relating to a single issuer (such as a declaration of bankruptcy or a delisting of the issuer’s security from the primary market on which it has traded) as well as events affecting the securities markets in general (such as market disruptions or closings and significant fluctuations in U.S. and/or foreign markets). Fair value pricing may require subjective determinations about the value of a security, and fair values used to determine a Fund’s NAV may differ from quoted or published prices, or from prices that are used by others, for the same securities. In addition, the use of fair value pricing may not always result in adjustments to the prices of securities held by a Fund.

Accessing Your Account Information

Loomis Sayles Funds Website. You can access our website at www.loomissayles.com to perform transactions (purchases, redemptions or exchanges), review your account information, change your address, order duplicate statements or tax forms or obtain a prospectus, an SAI, an application or periodic reports.

Loomis Sayles Automated Voice Response System. You have access to your account 24 hours a day by calling Loomis Sayles’ automated voice response system at 800-633-3330, option 1. Using this customer service option you may review your account balance and Fund prices, order duplicate statements, order duplicate tax forms, obtain distribution and performance information and obtain wiring instructions.

How To Purchase Shares

Each Fund is generally available for purchase in the United States, Puerto Rico, Guam and the U.S. Virgin Islands. Except to the extent otherwise permitted by the Distributor, the Funds will only accept investments from U.S. citizens with a U.S. address (including APO/FPO) or resident aliens with a U.S. address and a U.S. taxpayer identification number.

Directly from the Fund. Loomis Sayles Funds’ transfer agent must receive your purchase request in proper form before the close of regular trading on the NYSE in order for you to receive that day’s NAV.

You can purchase shares directly from each Fund in several ways:

By mail. You can buy shares of each Fund by submitting a completed application form, which is available online at www.loomissayles.com or by calling Loomis Sayles Funds at 800-633-3330, for the desired Fund or Funds along with a check payable to Loomis Sayles Funds for the amount of your purchase to:

After your account has been established, you may send subsequent investments directly to Loomis Sayles Funds at the above addresses. Please include either the investment slip from your account statement or a letter specifying the Fund name, your account number and your name, address and telephone number.

By wire. You also may wire subsequent investments by using the following wire instructions. Your bank may charge a fee for transmitting funds by wire.

State Street Bank and Trust Company
ABA No. 011000028
DDA 9904-622-9
(Your account number)
(Your name)
(Name of Fund)

By telephone. You can make subsequent investments by calling Loomis Sayles Funds at 800-633-3330.

By exchange. You may purchase shares of a Fund by exchange of shares of the same class of another Fund by sending a signed letter of instruction to Loomis Sayles Funds, by calling Loomis Sayles Funds at 800-633-3330 or by accessing your account online at www.loomissayles.com.

Through Automated Clearing House (“ACH”). You may purchase shares of a Fund through ACH by either calling Loomis Sayles Funds at 800-633-3330 or by accessing your account online at www.loomissayles.com.

By internet. If you have established a Personal Identification Number (“PIN”) and you have established the electronic transfer privilege, you can make subsequent investments through your online account at www.loomissayles.com. If you have not established a PIN but you have established the electronic transfer privilege from www.loomissayles.com, click on “Client Login,” under Mutual Funds Login, click on “Login to Mutual Funds,” click on “Establish User ID,” and follow the instructions.

Through systematic investing. You can make regular investments of $50,000 or more per month through automatic deductions from your bank checking or savings account. If you did not establish the electronic transfer privilege on your application, you may add the privilege by obtaining an Account Options Form through your financial adviser, by calling Loomis Sayles Funds at 800-633-3330 or by visiting www.loomissayles.com. A medallion signature guarantee may be required to add this option.

Each Fund sells its shares at the NAV next calculated after the Fund receives a properly completed investment order. The Fund generally must receive your properly completed order before the close of regular trading on the NYSE for your shares to be bought or sold at the Fund’s NAV on that day.

Subject to the approval of the Fund, an investor may purchase Institutional Class shares of a Fund with liquid securities and other assets that are eligible for purchase by the Fund (consistent with the Fund’s investment policies and restrictions) and that have a value that is readily ascertainable in accordance with the Fund’s valuation policies. These transactions will be effected only if Loomis Sayles deems the security to be an appropriate investment for the Fund. Assets purchased by a Fund in such a transaction will be valued in accordance with procedures adopted by the Fund. The Funds reserve the right to amend or terminate this practice at any time.

All purchases made by check should be in U.S. dollars and made payable to Loomis Sayles Funds. Third party checks, starter checks and credit card convenience checks will not be accepted. Upon redemption of an investment by check or by periodic account investment, redemption proceeds may be withheld until the check has cleared or the shares have been in your account for 10 days.

A Fund may periodically close to new purchases of shares or refuse any order to buy shares if the Fund determines that doing so would be in the best interests of the Fund and its shareholders. See the section “Restrictions on Buying, Selling and Exchanging Shares” below.

Each Fund is required by federal regulations to obtain personal information from you and to use that information to verify your identity. A Fund may not be able to open your account if the requested information is not provided. Each Fund reserves the right to refuse to open an account, close an account and redeem your shares at the then current price or take other such steps that the Fund deems necessary to comply with federal regulations if your identity is not verified.

The following table shows the minimum initial investment for each Fund.

Institutional Class shares of the Funds are available to Fund trustees, former Fund trustees, employees of affiliates of the Natixis Funds and other individuals who are affiliated with any Natixis Fund (this also applies to any spouse, parents, children, siblings, grandparents, grandchildren and in-laws of those mentioned) with no initial or subsequent investment minimum.

Loomis Sayles or the Distributor, in its sole discretion, may lower investment minimums for accounts associated with wrap-fee programs sponsored by certain broker-dealers and investment advisers and for accounts associated with certain other defined contribution plans.

Each Fund’s shares may be purchased by all types of tax-deferred retirement plans, provided the plan meets the minimum requirements for each fund. If you wish to open an individual retirement account (“IRA”) with a Fund, you may obtain retirement forms online at www.loomissayles.com or by calling Loomis Sayles at 800-633-3330.

Each subsequent investment must be at least $50,000. Loomis Sayles reserves the right to waive these minimums at its sole discretion, including for certain retirement plans whose accounts are held on the books of the Funds’ transfer agent in an omnibus fashion. At the discretion of Loomis Sayles, employees and clients of Loomis Sayles may purchase shares of the Funds offered through this prospectus below the stated minimums. In addition, at the discretion of NGAM Advisors, clients of NGAM Advisors may also purchase shares of the Funds below the stated minimums.

In our continuing effort to reduce your Fund’s expenses and amount of mail that you receive from Loomis Sayles, we will mail only a single copy of prospectuses, proxy statements and financial reports to your household. Additional copies may be obtained by calling 800-633-3330.

This program will continue in effect unless you notify us that you do not want to participate in this combined mailing program. If you wish to receive separate mailings for each Fund you own in the future, please call us at the telephone number above or mail your written request to Loomis Sayles, P.O. Box 219594, Kansas City, MO 64121-9594 and we will resume separate mailings within 30 days.

Minimum Balance Policy. In order to address the relatively higher costs of servicing smaller fund positions, on an annual basis each Fund may close an account and send the account holder the proceeds if the account falls below $50 for direct accounts and $500 for networked accounts. The valuation of account balances for this purpose and the liquidation itself generally occur during October of each calendar year, although they may occur at another date in the year.

Certain accounts such as those using the Loomis Sayles’ Funds’ prototype document including IRAs, and accounts associated with wrap fee programs or defined contribution plans, are excepted from the liquidation. However, each Fund reserves the right to liquidate any account with a balance of one share or less regardless of the account type.

How To Redeem Shares

You can redeem shares of each Fund directly from the Fund on any day on which the NYSE is open for business. Shares purchased by check are redeemable, although each Fund may withhold payment until the purchase check has cleared. Redemption proceeds from shares purchased through check, telephone Automated Clearing House (“ACH”) or online ACH, may not be available immediately upon redemption and may be delayed until the shares have been in your account for 10 days.

Because large redemptions are likely to require liquidation by a Fund of portfolio holdings, payment for large redemptions may be delayed for up to seven days to provide for orderly liquidation of such holdings. Under unusual circumstances, the Funds may suspend redemptions or postpone payment for more than seven days. Although most redemptions are made in cash, as described in the SAI, each Fund reserves the right to redeem shares in-kind. If a shareholder receives a distribution in-kind, the shareholder will bear the market risk associated with the distributed securities and would incur brokerage or other charges in converting the securities to cash.

Generally, a transaction fee will be charged for expedited payment of redemption proceeds of $5.50 for wire transfers, $50 for international wire transfers or $20.50 for overnight delivery. These fees are subject to change.

Redemptions directly to the Funds. Loomis Sayles Funds’ transfer agent must receive your redemption request in proper form before the close of regular trading on the NYSE in order for you to receive that day’s NAV. Your redemptions generally will be sent to you via first class mail within three business days after your request is received in good order, although it may take longer.

You may make redemptions directly from each Fund in several ways:

By mail. Send a signed letter of instruction that includes the name of the Fund, the exact name(s) in which the shares are registered, any special capacity in which you are signing (such as trustee or custodian or on behalf of a partnership, corporation, or other entity), your address, telephone number, account number and the number of shares or dollar amount to be redeemed to the following address:

All owners of shares must sign the written request in the exact names in which the shares are registered. The owners should indicate any special capacity in which they are signing (such as trustee or custodian or on behalf of a partnership, corporation or other entity).

By exchange. You may sell some or all of your shares of a Fund and use the proceeds to buy shares of the same class of another Loomis Sayles Fund by sending a letter of instruction to Loomis Sayles Funds, calling Loomis Sayles Funds at 800-633-3330 or exchanging online at www.loomissayles.com.

By internet. If you have established a PIN and the electronic transfer privilege, you can redeem shares through your online account at www.loomissayles.com. If you have not established a PIN, but you have established the electronic transfer privilege, go to www.loomissayles.com, click on “Client Login,” under Mutual Funds Login, click on “Login to Mutual Funds,” click on “Establish User ID,” and follow the instructions.

By telephone. You may redeem shares by calling Loomis Sayles Funds at 800-633-3330. Proceeds from telephone redemption requests can be wired to your bank account, sent electronically by ACH to your bank account or sent by check in the name of the registered owner(s) to the address of record. A wire fee will be deducted from your proceeds. Your bank may charge you a fee to receive the wire.

Please call Loomis Sayles Funds at 800-633-3330 for an IRA Distribution Form, or download the form online at www.loomissayles.com.

The telephone redemption privilege may be modified or terminated by the Funds without notice. Certain of the telephone redemption procedures may be waived for holders of Institutional Class shares.

You may redeem by telephone to have a check sent to the address of record for the maximum value amount of $100,000. For your protection, telephone or internet redemption requests will not be permitted if Loomis Sayles Funds has been notified of an address change or bank account information change for your account within the preceding 30 days. Unless you indicate otherwise on your account application, Loomis Sayles Funds will be authorized to accept redemption and transfer instructions by telephone. If you prefer, you can decline telephone redemption and transfer privileges.

Systematic Withdrawal Plan. If the value of your account is $10,000 or more, you can have periodic redemptions automatically paid to you or to someone you designate. Please call 800-633-3330 for more information or to set up a systematic withdrawal plan or visit www.loomissayles.com to obtain an Account Options Form.

By wire. Before Loomis Sayles Funds can wire redemption proceeds to your bank account, you must provide specific wire instructions to Loomis Sayles Funds in writing. A wire fee will be deducted from the proceeds of each wire.

By ACH. Before Loomis Sayles Funds can send redemptions through ACH, you must provide specific wiring instructions to Loomis Sayles Funds in writing. For ACH redemptions, proceeds will generally arrive at your bank within three business days.

STAMP2000 Medallion Signature Guarantee. You must have your signature guaranteed by a bank, broker-dealer or other financial institution that can issue a STAMP2000 Medallion Signature Guarantee for the following types of redemptions:

• If you are selling more than $100,000 and you are requesting the proceeds by check (this does not apply to IRA transfer of assets to new custodian).
• If you are requesting that the proceeds check (of any amount) be made out to someone other than the registered owner(s) or sent to an address other than the address of record.
• If the account registration or bank account information has changed within the past 30 days.
• If you are instructing us to send the proceeds by check, wire or in some circumstances ACH to a bank account whose owner(s) do not match the owner(s) of the fund account.

The Funds will only accept STAMP2000 Medallion Signature Guarantees bearing the STAMP2000 Medallion imprint. Please note that a notary public cannot provide a STAMP2000 Medallion Signature Guarantee. This signature guarantee requirement may be waived by Loomis Sayles Funds in certain cases.

How To Exchange Shares

You may exchange the shares of your Fund, subject to investment minimums, for Institutional Class shares of any Loomis Sayles Fund that offers Institutional Class shares or for Class Y shares of any Natixis Fund that offers Class Y shares. All exchanges are subject to any restrictions described in the applicable Funds’ prospectuses.

The value of Fund shares that you wish to exchange must meet the investment minimum of the new fund. Please call 800-633-3330 (option 3) prior to requesting this transaction.

You may make an exchange by sending a signed letter of instruction, by telephone or through your online account at www.loomissayles.com.

Please remember that an exchange may be a taxable event for federal and/or state income tax purposes, so that you may realize a gain or loss that is subject to income tax.

Cost Basis Reporting

Upon the redemption or exchange of your shares in a Fund, the Fund will be required to provide you and the IRS with cost basis and certain other related tax information about the Fund shares you redeemed or exchanged. This cost basis reporting requirement is effective for shares purchased, including through dividend reinvestment, on or after January 1, 2012. Please consult the Fund at www.loomissayles.com or by calling Loomis Sayles Funds at 800-633-3330, as appropriate, for more information regarding available methods for cost basis reporting and how to select a particular method. Please also consult your tax advisor to determine which available cost basis method is best for you.

Investments, Risks and Performance

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Credit Risk is the risk that the issuer or guarantor of a fixed-income security in which the Fund invests, or the counterparty to a derivatives or other transaction will fail financially or otherwise be unwilling or unable to meet their obligations to the Fund.

Currency Risk is the risk that the value of the Fund’s investments will fall as a result of changes in exchange rates. Loomis Sayles may elect not to hedge currency risk or may hedge imperfectly, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged.

Derivatives Risk is the risk that the value of the Fund’s derivative investments such as forward currency contracts, options and futures transactions will fall, for example, because of changes in the value of the underlying reference instruments, pricing difficulties or lack of correlation with the underlying investments. The use of derivatives for other than hedging purposes may be considered a speculative activity, and involves greater risks than are involved in hedging. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an advantageous time or price. Moreover, a number of broker-dealers and other financial institutions have recently experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance that the Fund’s derivative counterparties will not experience similar financial difficulties, possibly resulting in losses to the Fund. This risk is greater for forward currency contracts and other over-the-counter traded derivatives. Investing in derivatives gives rise to other risks, such as leverage risk, liquidity risk, credit risk, counterparty risk, interest rate risk and market risk. The use of derivatives may cause the Fund to incur losses greater than those which would have occurred had derivatives not been used.

Emerging Markets Risk is the risk that the Fund’s investments may face greater foreign securities risk. Investing in companies traded in emerging securities markets, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization and regulatory oversight in emerging market economies is generally less than in more developed markets.

Equity Securities Risk is the risk that the value of a stock may decline for a number of reasons that relate directly to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services, or the equity markets generally. Growth stocks are generally more sensitive to market movements than other types of stocks, primarily because their stock prices are based heavily on future expectations. If Loomis Sayles’ assessment of the prospects for a company’s growth is wrong, or if Loomis Sayles’ judgment of how other investors will value the company’s growth is wrong, then the price of the company’s stock may fall or not approach the value that Loomis Sayles has placed on it. In the event an issuer is liquidated or declares bankruptcy, the claims of owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock.

Foreign Securities Risk is the risk that the value of the Fund’s foreign investments will fall as a result of foreign political, social, economic, environmental, credit, informational or currency changes or other issues relating to foreign investing generally. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. The Fund’s investments in foreign securities may be subject to foreign withholding taxes, which would decrease the yield on those securities.

Issuer Risk is the risk that the value of securities may decline due to a number of reasons relating to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Leverage Risk is the risk associated with securities or practices (e.g., borrowing and the use of certain derivatives) and investment in certain types of derivatives that multiply small index, market or asset price movements into larger changes in value. Use of derivative instruments may involve leverage. When a derivative is used as a hedge against an offsetting position that the Fund also holds, any loss generated by the derivative should be substantially offset by gains on the hedged instrument, and vice versa. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. Futures and forward currency contracts are derivatives and may be subject to this type of risk.

Liquidity Risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Securities acquired in a private placement, such as Rule 144A securities, generally are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so, or at the most advantageous time or price. Liquidity issues may also make it difficult to value the Fund’s investments.

Management Risk is the risk that Loomis Sayles’ investment techniques will be unsuccessful and cause the Fund to incur losses.

Market Risk is the risk that the market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

Small-Capitalization Companies Risk is the risk that the Fund’s investments may be subject to more abrupt price movements, limited markets, increased volatility and less liquidity than investments in larger, more established companies, which could adversely affect the value of the portfolio.

Risk/Return Bar Chart and Table

The following bar chart and table give an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for the one-year, five-year, ten-year and life-of-fund periods compare to those of a broad measure of market performance. The Fund’s past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future. Updated performance information is available online at www.loomissayles.com and/or by calling the Fund toll-free at 800-633-3330.

Total Returns for Institutional Class Shares

The Fund’s best quarter was 25.29%, (second quarter of 2003), and the Fund’s worst quarter was -26.86%, (fourth quarter of 2008).

Average Annual Total Returns for the periods ended December 31, 2012

Because the Fund did not have Class N shares outstanding during the periods shown, performance is that of the Institutional Class shares of the Fund. Class N shares would have had substantially similar returns because they would have been invested in the same portfolio of securities as Institutional Class shares and would only differ to the extent the classes did not have the same expenses. The Class N returns may be higher than the returns of Institutional Class shares because Institutional Class shares are subject to higher expenses.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts. The after-tax returns are shown for the Institutional Class of the Fund. After-tax returns for other classes of the Fund will vary. Index performance reflects no deduction for fees, expenses or taxes.

Investments, Risks and Performance

Principal Risks

The principal risks of investing in the Fund are summarized below. The Fund does not represent a complete investment program. You may lose money by investing in the Fund.

Credit Risk is the risk that the issuer or guarantor of a fixed-income security in which the Fund invests, or the counterparty to a derivatives or other transaction will fail financially or otherwise be unwilling or unable to meet their obligations to the Fund.

Currency Risk is the risk that the value of the Fund’s investments will fall as a result of changes in exchange rates. Loomis Sayles may elect not to hedge currency risk or may hedge imperfectly, which may cause the Fund to incur losses that would not have been incurred had the risk been hedged.

Derivatives Risk is the risk that the value of the Fund’s derivative investments such as forward currency contracts, options and futures transactions will fall, for example, because of changes in the value of the underlying reference instruments, pricing difficulties or lack of correlation with the underlying investments. The use of derivatives for other than hedging purposes may be considered a speculative activity, and involves greater risks than are involved in hedging. There is also the risk that the Fund may be unable to terminate or sell a derivatives position at an advantageous time or price. Moreover, a number of broker-dealers and other financial institutions have recently experienced extreme financial difficulty, sometimes resulting in bankruptcy of the institution. There can be no assurance that the Fund’s derivative counterparties will not experience similar financial difficulties, possibly resulting in losses to the Fund. This risk is greater for forward currency contracts and other over-the-counter traded derivatives. Investing in derivatives gives rise to other risks, such as leverage risk, liquidity risk, credit risk, counterparty risk, interest rate risk and market risk. The use of derivatives may cause the Fund to incur losses greater than those which would have occurred had derivatives not been used.

Emerging Markets Risk is the risk that the Fund’s investments may face greater foreign securities risk. Investing in companies traded in emerging securities markets, which may be smaller and have shorter operating histories than companies in developed markets, involves risks in addition to, and greater than, those generally associated with investing in developed foreign markets. The extent of economic development, political stability, market depth, infrastructure, capitalization and regulatory oversight in emerging market economies is generally less than in more developed markets.

Equity Securities Risk is the risk that the value of a stock may decline for a number of reasons that relate directly to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services, or the equity markets generally. Value stocks can perform differently from the market as a whole and from other types of stocks. Value stocks present the risk that their lower valuations fairly reflect their business prospects or that other investors will not agree that the stocks represent favorable investment opportunities, and they may fall out of favor with investors and underperform growth stocks during any given period. In the event an issuer is liquidated or declares bankruptcy, the claims by owners of the issuer’s bonds generally take precedence over the claims of those who own preferred stock or common stock.

Foreign Securities Risk is the risk that the value of the Fund’s foreign investments will fall as a result of foreign political, social, economic, environmental, credit, informational or currency changes or other issues relating to foreign investing generally. Foreign securities may be subject to higher volatility than U.S. securities, varying degrees of regulation and limited liquidity. The Fund’s investments in foreign securities may be subject to foreign withholding taxes, which would decrease the yield on those securities.

Investments in Other Investment Companies Risk is the risk that the Fund will indirectly bear the management service and other fees of the other investment company in addition to its own expenses.

Issuer Risk is the risk that the value of securities may decline due to a number of reasons relating to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods and services.

Leverage Risk is the risk associated with securities or practices (e.g., borrowing and the use of certain derivatives) and investment in certain types of derivatives that multiply small index, market or asset price movements into larger changes in value. Use of derivative instruments may involve leverage. When a derivative is used as a hedge against an offsetting position that the Fund also holds, any loss generated by the derivative should be substantially offset by gains on the hedged instrument, and vice versa. To the extent that the Fund uses a derivative for purposes other than as a hedge, or if the Fund hedges imperfectly, the Fund is directly exposed to the risks of that derivative and any loss generated by the derivative will not be offset by a gain. Futures and forward currency contracts are derivatives and may be subject to this type of risk.

Liquidity Risk is the risk that the Fund may be unable to find a buyer for its investments when it seeks to sell them or to receive the price it expects. Securities acquired in a private placement, such as Rule 144A securities, generally are subject to strict restrictions on resale and there may be no liquid secondary market or ready purchaser for such securities. Therefore, the Fund may be unable to dispose of such securities when it desires to do so, or at the most advantageous time or price. Liquidity issues may also make it difficult to value the Fund’s investments.

Management Risk is the risk that Loomis Sayles’ investment techniques will be unsuccessful and cause the Fund to incur losses.

Market Risk is the risk that the market value of a security will move up and down, sometimes rapidly and unpredictably, based upon a change in an issuer’s financial condition, as well as overall market and economic conditions.

REITs Risk is the risk that the value of the Fund’s investments in REITs will fall as a result of changes in underlying real estate values, rising interest rates, limited diversification of holdings, higher costs and prepayment risk associated with related mortgages, as well as other risks particular to investments in real estate. Many REITs are highly leveraged, increasing their risk. The Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund.

Small-Capitalization Companies Risk is the risk that the Fund’s investments may be subject to more abrupt price movements, limited markets, increased volatility and less liquidity than investments in larger, more established companies, which could adversely affect the value of the portfolio.

Risk/Return Bar Chart and Table

The following bar chart and table give an indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual returns for the one-year, five-year, ten-year and life-of-fund periods compare to those of two broad measures of market performance. The Russell 2000 Value Index is an unmanaged index that measures the performance of those Russell 2000 companies with lower price-to-book ratios and lower forecasted

8

Total Returns for Institutional Class Shares

The Fund’s best quarter was 19.42%, (third quarter of 2009), and the Fund’s worst quarter was -23.69%, (fourth quarter of 2008).

Average Annual Total Returns for the periods ended December 31, 2012

	One Year	Five Years	Ten Years	Life-of-Fund (5/13/91)
Institutional Class
Return Before Taxes	16.34%	4.70%	10.37%	12.11%
Return After Taxes on Distributions	16.15%	4.61%	9.43%	10.16%
Return After Taxes on Distributions and Sale of Fund Shares	10.87%	4.03%	8.89%	9.82%
Retail Class – Return Before Taxes	16.06%	4.43%	10.09%	11.90%
Admin Class – Return Before Taxes	15.75%	4.17%	9.81%	11.57%
Class N – Return Before Taxes	16.34%	4.70%	10.37%	12.11%
Russell 2000 Value Index	18.05%	3.55%	9.50%	11.12%
Russell 2000 Index	16.35%	3.56%	9.72%	9.10%

Total returns shown for the Fund reflect the results of the Loomis Sayles Small Cap Value Fund, a series of Loomis Sayles Funds II (the “Predecessor Fund”) whose assets and liabilities were reorganized into the Fund, a series of Loomis Sayles Funds I, on September 12, 2003. For periods before the inception of Retail Class shares (December 31, 1996) and Admin Class shares (January 2, 1998) of the Predecessor Fund, the performance shown for those Classes is based on the returns of the Predecessor Fund’s Institutional Class shares, adjusted to reflect the net expenses paid by Retail Class and Admin Class shares of the Predecessor Fund. Because the Fund did not have Class N shares outstanding during the periods shown, performance is that of the Institutional Class shares of the Fund. Class N shares would have had substantially similar returns because they would have been invested in the same portfolio of securities as Institutional Class shares and would only differ to the extent the classes did not have the same expenses. The Class N returns may be higher than the returns of Institutional Class shares because Institutional Class shares are subject to higher expenses.

After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements, such as 401(k) plans, qualified plans, education savings accounts, such as 529 plans, or individual retirement accounts. The after-tax returns are shown for the Institutional Class of the Fund. After-tax returns for other classes of the Fund will vary. Index performance reflects no deduction for fees, expenses or taxes.

Investments in Other Investment Companies Risk

Issuer Risk

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

Leverage Risk

When a Fund borrows money or otherwise leverages its portfolio, the value of an investment in the Fund will be more volatile, and all other risks are generally compounded. Funds face this risk if they create leverage by using investments such as reverse repurchase agreements, inverse floating-rate instruments or derivatives, or by borrowing money. The use of leverage may lead to losses that are greater than if the Fund had not used leverage.

Liquidity Risk

Liquidity risk exists when particular investments are difficult to purchase or sell, possibly preventing a Fund from selling these illiquid securities at the price or at the time desired. Liquidity issues could also make it difficult to value a Fund’s investments, which could also negatively impact NAV. An unrated security may be less liquid than a comparable rated security and involves the risk that Loomis Sayles may not accurately evaluate the security’s comparative credit rating. Derivatives and securities that involve substantial interest rate or credit risk tend to involve greater liquidity risk. In addition, liquidity risk tends to increase to the extent a Fund invests in securities whose sale may be restricted by law or by contract, such as Rule 144A securities. Investment in derivatives may be less liquid when compared to other investments, especially during periods of market stress.

Management Risk

Management risk is the risk that Loomis Sayles’ investment techniques could fail to achieve a Fund’s objective and could cause your investment in a Fund to lose value. Each Fund is subject to management risk because each Fund is actively managed by Loomis Sayles. Loomis Sayles will apply its investment techniques and risk analyses in making investment decisions for each Fund, but there can be no guarantee that Loomis Sayles’ decisions will produce the desired results. For example, securities that Loomis Sayles expects may appreciate in value may in fact decline. Similarly, in some cases derivative and other investment techniques may be unavailable or Loomis Sayles may decide not to use them, even under market conditions where their use could have benefited a Fund.

Market Risk

This is the risk that the value of a Fund’s investments will change as financial markets fluctuate and that prices overall may decline. The value of a company’s securities may fall as a result of factors that directly relate to that company, such as decisions made by its management or lower demand for the company’s products or services. A security’s value also may fall because of factors affecting not just the issuer of a security, but companies in its industry or in a number of different industries, such as increases in production costs. The value of a company’s securities also may be affected by changes in financial market or other economic conditions, such as changes in interest rates or currency exchange rates. In addition, a company’s stock generally pays

16

Market risk generally is greater for Funds that invest substantially in small- and medium-sized companies, since these companies tend to be more vulnerable to adverse developments than large companies. Initial public offering securities tend to involve greater market risk than other equity securities due, in part, to public perception and the lack of public information and trading history.

REITs Risk

REITs involve certain unique risks in addition to those risks associated with investing in the real estate industry in general (such as possible declines in the value of real estate, lack of availability of mortgage funds or extended vacancies of property). Equity REITs may be affected by changes in the value of the underlying property owned by the REITs, while mortgage REITs may be affected by the quality of any credit extended. REITs are dependent upon management skills, are not diversified and are subject to heavy cash flow dependency, risks of default or prepayment by borrowers and self-liquidation. REITs are also subject to the possibilities of failing to qualify for tax-free pass-through of income under the Internal Revenue Code of 1986 (the “Code”), and failing to maintain their exemptions from registration under the 1940 Act.

Furthermore, the real estate industry is particularly sensitive to economic downturns. Securities of companies in the real estate industry, including REITs, are sensitive to factors such as changes in real estate values, property taxes, interest rates, cash flow of underlying real estate assets, occupancy rates, government regulations affecting zoning, land use and rents and the management skill and creditworthiness of the issuer. Companies in the real estate industry may also be subject to liabilities under environmental and hazardous waste laws. In addition, the value of a REIT is affected by changes in the value of the properties owned by the REIT or securing mortgage loans held by the REIT. A Fund will indirectly bear its proportionate share of expenses, including management fees, paid by each REIT in which it invests in addition to the expenses of the Fund.

REITs may have limited financial resources, may trade less frequently and in a limited volume and may be subject to more abrupt or erratic price movements than more widely-held securities.

A Fund’s investment in a REIT may require the Fund to accrue and distribute income not yet received or may result in the Fund making distributions that constitute a return of capital to Fund shareholders for U.S. federal income tax purposes. In addition, distributions by a Fund from REITs will not qualify for the corporate dividends-received deduction or, generally, for treatment as qualified dividend income.

Small-Capitalization Companies Risk

The general risks associated with corporate income-producing securities are particularly pronounced for securities issued by companies with smaller market capitalizations. These companies may have limited product lines, markets or financial resources or they may depend on a few key employees. As a result, they may be subject to greater levels of credit, market and issuer risk. Securities of smaller companies may trade less frequently and in lesser volume than more widely-held securities and their values may fluctuate more sharply than other securities. Further, securities of smaller companies may perform differently in different cycles than securities of larger companies. Companies with medium-sized market capitalizations may have risks similar to those of smaller companies.

management

Investment Adviser

Loomis Sayles, located at One Financial Center, Boston, Massachusetts 02111, serves as the investment adviser to the Funds. Loomis Sayles is a subsidiary of Natixis US, which is part of Natixis Global Asset Management, an international asset management group based in Paris, France. Founded in 1926, Loomis Sayles is one of the oldest investment firms in the United States with over $186.1 billion in assets under management as of December 31, 2012. Loomis Sayles has an extensive internal research staff. Loomis Sayles is responsible for making investment decisions for each Fund.

The aggregate advisory fees paid by the Funds during the fiscal year ended September 30, 2012, as a percentage of each Fund’s average daily net assets were:

A discussion of the factors considered by the Funds’ Board of Trustees in approving the Funds’ investment advisory contracts is available in the Funds’ annual reports for the fiscal year ended September 30, 2012.

Portfolio Managers

The following persons have had primary responsibility for the day-to-day management of each indicated Fund’s portfolio since the date stated below. Except where noted, each portfolio manager has been employed by Loomis Sayles for at least five years.

Mark F. Burns has served as portfolio manager of the Loomis Sayles Small Cap Growth Fund since 2005. Mr. Burns, Vice President of Loomis Sayles, began his investment career in 1993 and joined Loomis Sayles in 1999. Mr. Burns holds the designation of Chartered Financial Analyst. He earned a B.A. from Colby College and a M.B.A. from Cornell University and has over 18 years of investment experience.

Joseph R. Gatz has served as portfolio manager of the Loomis Sayles Small Cap Value Fund since 2000. Mr. Gatz, Vice President of Loomis Sayles, began his investment career in 1985 and joined Loomis Sayles in 1999. Mr. Gatz holds the designation of Chartered Financial Analyst. He earned a B.A. from Michigan State University and an M.B.A. from Indiana University and has over 27 years of investment experience.

Jeffrey Schwartz has served as a portfolio manager of the Loomis Sayles Small Cap Value Fund since 2012. Mr. Schwartz, Vice President of Loomis Sayles, began his investment career in 1992 and joined Loomis Sayles in 2012. He previously served as Vice President and Senior Portfolio Manager of Palisade Capital Management from 2004 until 2012. Mr. Schwartz holds the designation of Chartered Financial Analyst. He earned a B.A. from the State University of New York, Binghamton and an M.B.A. from the University of Michigan and has over 20 years of investment experience.

John J. Slavik has served as portfolio manager of the Loomis Sayles Small Cap Growth Fund since 2005. Mr. Slavik, Vice President of Loomis Sayles, began his investment career in 1991 and joined Loomis Sayles in 2005. Mr. Slavik holds the designation of Chartered Financial Analyst. He earned a B.A. from the University of Connecticut and has over 21 years of investment experience.

Please see the SAI for information regarding portfolio manager compensation, other accounts under management by the portfolio managers and the portfolio managers’ ownership of securities in the Funds.