DOMINI IMPACT BOND FUND CLASS Y SHARES (DSBYX) Exchange: NMFQS

Under normal circumstances, the Fund invests at least 80% of its assets in investment-grade securities and maintains an effective duration within two years (plus or minus) of the portfolio duration of the securities comprising the Bloomberg Barclays U.S. Aggregate Bond Index as calculated by the subadviser. Under normal circumstances, at least 80% of the Fund’s net assets (plus the amount of borrowings, if any, for investment purposes) will be invested in bonds, including government and corporate bonds, mortgage-backed and asset-backed securities, non-U.S. dollar denominated bonds, and U.S. dollar denominated bonds issued by non-U.S. entities. The Fund’s investments in bonds also may include floating and variable rate loans, and municipal securities. A significant portion of the Fund’s assets may be invested in securities issued by government-sponsored entities such as Freddie Mac, Fannie Mae, and the Federal Home Loan Banks. A significant portion of the Fund’s assets may also be invested in “to be announced” securities, including mortgage dollar roll, when-issued, delayed delivery and forward commitment securities. A “to be announced” transaction is a method of trading mortgage-backed securities where the buyer and seller agree upon general trade parameters such as agency, settlement date, par amount, and price at the time the contract is entered into but the mortgage-backed securities are delivered in the future, generally 30 days later. The Fund generally has a high rate of portfolio turnover as a consequence of investing in “to be announced” securities. The Fund may invest up to 20% of its net assets in below investment grade debt securities (sometimes referred to as “junk bonds”) or, if unrated, of equivalent credit quality as determined by the subadviser. The Fund may invest in privately issued mortgage-backed and asset-backed securities. The Fund may invest in securities that are in default and illiquid securities. The Fund’s investments may change significantly from time to time based on current market conditions and investment eligibility determinations. While pursuing their financial objectives, impact investors seek to use their investments to create a more fair and sustainable world. Domini believes that by factoring environmental and social standards into their investment decisions, investors can encourage greater issuer accountability. Domini evaluates the Fund’s potential corporate debt instruments against its environmental and social standards based on the businesses in which an issuer engages, as well as on the quality of an issuer’s relations with key stakeholders, including communities, customers, ecosystems, employees, investors, and suppliers. For noncorporate issuers, including government-sponsored entities, Domini seeks to identify investments that generate positive social, environmental or community impact, especially on underserved communities. Domini’s interpretation and application of its environmental and social standards are subjective and may evolve over time. The Fund’s subadviser uses proprietary fundamental research to select investments to buy and sell from among those which Domini has notified the subadviser are eligible for investment, based upon an identification of structural, cyclical and opportunistic themes, as well as individual sector and security characteristics. The Fund also will sell securities that no longer meet Domini’s environmental and social standards.