Strategy. Under normal market conditions, the Fund will invest at least 80% of its net assets (plus any borrowings made for investment purposes) in fixed-income securities (for example, bonds and other investments that Loomis Sayles believes have similar economic characteristics, such as notes, debentures and loans). The Fund will primarily invest in investment-grade-fixed-income securities. The Fund may also invest up to 35% of its assets in below investment-grade fixed- income securities (commonly known as junk bonds). Below investment-grade fixed-income securities are rated below investment-grade quality (i.e., none of the three major rating agencies (Moodys Investors Service, Inc., Fitch Investor Services, Inc. or S&P Global Ratings) have rated the securities in one of their respective top four ratings categories). The Funds fixed-income … Show more… Under normal market conditions, the Fund will invest at least 80% of its net assets (plus any borrowings made for investment purposes) in fixed-income securities (for example, bonds and other investments that Loomis Sayles believes have similar economic characteristics, such as notes, debentures and loans). The Fund will primarily invest in investment-grade-fixed-income securities. The Fund may also invest up to 35% of its assets in below investment-grade fixed- income securities (commonly known as junk bonds). Below investment-grade fixed-income securities are rated below investment-grade quality (i.e., none of the three major rating agencies (Moodys Investors Service, Inc., Fitch Investor Services, Inc. or S&P Global Ratings) have rated the securities in one of their respective top four ratings categories). The Funds fixed-income securities investments may include unrated securities (securities that are not rated by a rating agency) if Loomis Sayles determines that the securities are of comparable quality to rated securities that the Fund may purchase. There is no minimum rating for the securities in which the Fund may invest. The Fund may invest in fixed-income securities of any maturity. The Fund may invest in securities of any duration. The Fund will primarily invest in fixed-income securities of domestic and foreign corporate issuers. The Fund may invest up to 30% of its assets in foreign securities, including emerging markets securities. Although certain securities purchased by the Fund may be issued by domestic companies incorporated outside of the United States, Loomis Sayles does not consider these securities to be foreign if the issuer is included in the U.S. fixed-income indices published by Bloomberg. The Fund will only invest in U.S. dollar denominated securities. In deciding which securities to buy and sell, Loomis Sayles may consider a number of factors related to the bond issue and the current bond market, including, for example, the financial strength of the issuer, current interest rates, current valuations and Loomis Sayles expectations regarding general trends in interest rates. Loomis Sayles will also consider how purchasing or selling a bond would impact the overall portfolios risk profile (for example, its sensitivity to interest rate risk and sector-specific risk) and potential return (income and capital gains). Three themes typically drive the Funds investment approach. First, Loomis Sayles generally seeks fixed-income securities that are attractively valued relative to the Loomis Sayles credit research teams assessment of credit risk. This includes seeking to capture credit improvement situations based on forward- looking proprietary research. The broad coverage combined with the objective of identifying attractive investment opportunities makes this an important component of the investment approach. Second, the Fund may invest significantly in securities the prices of which Loomis Sayles believes are more sensitive to events related to the underlying issuer than to changes in general interest rates or overall market default rates. These securities may not have a direct correlation with changes in interest rates, thus helping to manage interest rate risk and to offer diversified sources for return. Third, Loomis Sayles analyzes different sectors of the economy and differences in the yields (spreads) of various fixed-income securities (U.S. government securities, investment-grade securities, securitized assets, high-yield securities, emerging market securities, non-U.S. sovereigns and credits, convertible securities, bank loans and municipal securities) in an effort to find securities that it believes may produce attractive returns for the Fund in comparison to their risk. The Fund may also invest in U.S. government securities, bank loans, collateralized loan obligations, convertible securities and securities issued pursuant to Rule 144A under the Securities Act of 1933 (Rule 144A securities). The Fund may also invest in futures, forward contracts and swaps (including credit default swaps) for hedging and investment purposes. Show less