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Domini Impact Equity Fund – Investor Shares

* Average annual total returns.
Returns for periods less than one year are not annualized.

The Fund’s current investment strategy and Subadviser services commenced on December 1, 2018. Performance information for periods beginning prior to December 1, 2018 reflects the investment strategies employed during those periods.

The Fund’s Adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Investor share expenses to 1.09% through November 30, 2023. There can be no assurance the Adviser will extend the expense limitations beyond such time. While in effect, the arrangement may be terminated for a class only by agreement of the Adviser and the Fund’s Board of Trustees.

Gross/Net Annual Expense Ratio: 1.05%/1.05% per current prospectus.

Past performance is no guarantee of future results.  Before investing, consider the Fund’s investment objectives, risks, charges, and expenses. This and other important information can be found in the Fund’s prospectus, which may be obtained here or by calling 1-800-582-6757. Read it carefully. The Fund’s returns quoted above represent past performance after all expenses. The returns reflect any applicable expense waivers in effect during the periods shown. Without such waivers, Fund performance would be lower. Investment return, principal value, and yield will fluctuate. Your shares, when redeemed, may be worth more or less than their original cost. See shares Performance above for more complete performance information, including returns current to the most recent month-end, which may be lower or higher than the performance data quoted. Periods less than one year are not annualized. See the prospectus for further information.

An investment in the Domini Impact Equity Fund is not a bank deposit and is not insured. The Fund is subject to certain risks, including the loss of principal, impact investing, portfolio management, information, market, mid- to large-cap companies, and small-cap companies risks. You may lose money. See the prospectus for more information on risk.

The performance above does not reflect the deduction of fees and taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. Total return is based on the Fund’s net asset values and assumes all dividends and capital gains were reinvested.

The Standard & Poor’s 500 Index (S&P 500) is an unmanaged index of common stocks. Investors cannot invest directly in the S&P 500.

Although the Domini Impact Equity Fund Investor shares are no-load, certain fees and expenses apply to a continued investment and are described in the prospectus.

Domini International Opportunities Fund – Investor Shares

* Average annual total returns.
Returns for periods less than one year are not annualized.

1. Inception date November 30, 2020

The Fund’s Adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Investor share expenses to 1.40% through November 30, 2023. There can be no assurance the Adviser will extend the expense limitations beyond such time. While in effect, the arrangement may be terminated for a class only by agreement of the Adviser and the Fund’s Board of Trustees.

Gross/Net Annual Expense Ratio: 4.36%/1.40% per current prospectus.

Past performance is no guarantee of future results. The Fund’s returns quoted above represent past performance after all expenses. The returns reflect any applicable expense waivers in effect during the periods shown. Without such waivers, Fund performance would be lower. Investment return, principal value, and yield will fluctuate. Your shares, when redeemed, may be worth more or less than their original cost. See shares Performance above above for more complete performance information, including returns current to the most recent month-end, which may be lower or higher than the performance data quoted. See the prospectus for further information.

An investment in the Domini International Opportunities Fund is not a bank deposit and is not insured. The Fund is subject to certain risks, including the loss of principal, foreign investing, geographic focus, country, currency, impact investing, portfolio management, and information risks. Investing internationally involves special risks, such as currency fluctuations, social and economic instability, differing securities regulations and accounting standards, limited public information, possible changes in taxation, and periods of illiquidity. These risks may be heightened in connection with investments in emerging market countries.

The Adviser’s evaluation of environmental and social factors in its investment selections and the timing of the Subadviser’s implementation of the Adviser’s investment selections will affect the Fund’s exposure to certain issuers, industries, sectors, regions, and countries and may impact the relative financial performance of the Fund depending on whether such investments are in or out of favor. The value of your investment may decrease if the Adviser’s or Subadviser’s judgement about Fund investments does not produce the desired results. There is a risk that information used by the Adviser to evaluate environmental and social factors, may not be readily available or complete, which could negatively impact the Adviser’s ability to evaluate such factors and Fund performance. You may lose money.

The performance above does not reflect the deduction of fees and taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. Total return is based on the Fund’s net asset values and assumes all dividends and capital gains were reinvested.

Although the Domini International Opportunities Fund Investor shares are no-load, certain fees and expenses apply to a continued investment and are described in the prospectus.

The Morgan Stanley Capital International Europe Australasia Far East Index (net) (MSCI EAFE) is a market-capitalization weighted index representing the performance of large- and mid-capitalization companies in developed markets outside the United States and Canada. MSCI EAFE returns reflect reinvested dividends net of withholding taxes but reflect no deduction for fees, expenses or other taxes. Investors cannot invest directly in the MSCI EAFE.

Domini Sustainable Solutions Fund – Investor Shares

* Average annual total returns.
Returns for periods less than one year are not annualized

1. Inception date April 1, 2020

The Fund’s Adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Investor share expenses to 1.40% through November 30, 2023. There can be no assurance the Adviser will extend the expense limitations beyond such time. While in effect, the arrangement may be terminated for a class only by agreement of the Adviser and the Fund’s Board of Trustees.

Gross/Net Annual Expense Ratio: 1.99%/1.40% Per current prospectus.

Past performance is no guarantee of future results. The Fund’s returns quoted above represent past performance after all expenses. The returns reflect any applicable expense waivers in effect during the periods shown. Without such waivers, Fund performance would be lower. Investment return, principal value, and yield will fluctuate. Your shares, when redeemed, may be worth more or less than their original cost. Select the Performance Tab above for more complete performance information, including returns current to the most recent month-end, which may be lower or higher than the performance data quoted. See the prospectus for further information.

An investment in the Domini Sustainable Solutions Fund is not a bank deposit and is not insured. The Fund is subject to certain risks, including the loss of principal, sustainable investing, portfolio management, information, market, mid- to large-cap companies, and small-cap companies risks. Investing internationally involves special risks, such as currency fluctuations, social and economic instability, differing securities regulations and accounting standards, limited public information, possible changes in taxation, and periods of illiquidity. You may lose money. See the prospectus for more information on risk.

The performance above does not reflect the deduction of fees and taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. Total return is based on the Fund’s net asset values and assumes all dividends and capital gains were reinvested.

Although the Domini Sustainable Solutions Fund Investor shares are no-load, certain fees and expenses apply to a continued investment and are described in the prospectus.

The MSCI World Investable Market Index (net) (MSCI World IMI) is a market-capitalization weighted index representing the performance of large-mid- and small-capitalization companies in developed markets. The MSCI IMI includes the reinvestment of dividends net of withholding tax, but does not reflect other fees, expenses or taxes. Investors cannot invest directly in the MSCI World IMI.

Domini Impact International Equity Fund – Investor Shares

* Returns for periods of less than one year are not annualized.

Gross/Net Annual Expense Ratio: 1.34%/1.34% Per current prospectus.

Past performance is no guarantee of future results. The Fund’s returns quoted above represent past performance after all expenses. The returns reflect any applicable expense waivers in effect during the periods shown. Without such waivers, Fund performance would be lower. Investment return, principal value, and yield will fluctuate. Your shares, when redeemed, may be worth more or less than their original cost. Select the Performance Tab above for more complete performance information, including returns current to the most recent month-end, which may be lower or higher than the performance data quoted. See the prospectus for further information.

An investment in the Domini Impact International Equity Fund is not a bank deposit and is not insured. The Fund is subject to certain risks, including the loss of principal, foreign investing and emerging markets, geographic focus, country, currency, impact investing, and portfolio management risks. Investing internationally involves special risks, such as currency fluctuations, social and economic instability, differing securities regulations and accounting standards, limited public information, possible changes in taxation, and periods of illiquidity. These risks may be heightened in connection with investments in emerging market countries. You may lose money. See the prospectus for more information on risk.

The performance above does not reflect the deduction of fees and taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. Total return is based on the Fund’s net asset values and assumes all dividends and capital gains were reinvested.

Although the Domini Impact International Equity Fund Investor shares are no-load, certain fees and expenses apply to a continued investment and are described in the prospectus.

The Morgan Stanley Capital International Europe Australasia Far East Index (net) (MSCI EAFE) is a market-capitalization weighted index representing the performance of large- and mid-capitalization companies in developed markets outside the United States and Canada. MSCI EAFE returns reflect reinvested dividends net of withholding taxes but reflect no deduction for fees, expenses or other taxes. Investors cannot invest directly in the MSCI EAFE.

Domini Impact Bond Fund – Investor Shares

* Average annual total returns.
Returns for periods less than one year are not annualized.

The Fund’s current investment strategy and Subadviser services commenced on January 7, 2015. Performance information for periods beginning prior to January 7, 2015 reflects the investment strategies employed during those periods.

The Fund’s Adviser has contractually agreed to waive certain fees and/or reimburse certain ordinary operating expenses in order to limit Investor share expenses to 0.87% through November 30, 2023. There can be no assurance the Adviser will extend the expense limitations beyond such time. While in effect, the arrangement may be terminated for a class only by agreement of the Adviser and the Fund’s Board of Trustees.

Annual Expense Ratio – Gross: 1.08% / Net: 0.87%. Per current prospectus.

Past performance is no guarantee of future results. The Fund’s returns quoted above represent past performance after all expenses. The returns reflect any applicable expense waivers in effect during the periods shown. Without such waivers, Fund performance would be lower. Investment return, principal value, and yield will fluctuate. Your shares, when redeemed, may be worth more or less than their original cost. See the Performance tables above for more complete performance information, including returns current to the most recent month-end, which may be lower or higher than the performance data quoted. See the prospectus for further information.

An investment in the Domini Impact Bond Fund is not a bank deposit and is not insured. The Fund is subject to certain risks, including the loss of principal, impact investing, portfolio management, style, information, market, interest rate, and credit risks. See the prospectus for more information on risk.

The performance above does not reflect the deduction of fees and taxes that a shareholder would pay on Fund distributions or the redemption of Fund shares. Total return is based on the Fund’s net asset values and assumes all dividends and capital gains were reinvested.

Although the Domini Impact Bond Fund Investor shares are no-load, certain fees and expenses apply to a continued investment and are described in the prospectus.

The Bloomberg U.S. Aggregate (BUSA) Bond Index is an index representing securities that are U.S. domestic, taxable, and dollar denominated and covering the U.S. investment-grade fixed-rate bond market, with index components for government and corporate securities and asset-backed securities. Investors cannot invest directly in the BUSA