Form N-1A Supplement

Oct. 31, 2024

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

NATIONWIDE MUTUAL FUNDS

Nationwide Bond Index Fund

Nationwide International Index Fund

Nationwide Mid Cap Market Index Fund

Nationwide NYSE Arca Tech 100 Index Fund

Nationwide Small Cap Index Fund

Supplement dated January 9, 2026

to the Prospectus dated February 28, 2025

Capitalized terms and certain other terms used in this supplement, unless otherwise defined in this supplement, have the meanings assigned to them in the Prospectus.

Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund

Each of the Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund (each a “Fund”) is updating its diversification policy under the Investment Company Act of 1940, as amended. Under the revised policy, each Fund will continue to track its respective index even if the Fund operates as nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents of its respective index.

Shareholder approval will not be sought if a Fund crosses from diversified to nondiversified status under such circumstances.

Nationwide Bond Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 3 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the Aggregate Bond Index before the deduction of Fund expenses. The Aggregate Bond Index represents a wide spectrum of public, investment grade, debt securities in the United States, including government, corporate, and international dollar-denominated bonds, as well as mortgage-backed securities. Some of these securities may be purchased with delayed delivery. Under normal circumstances, the Fund invests at least 80% of its net assets in a statistically selected sampling of bonds and other debt securities that are included in or correlated with the Aggregate Bond Index. The Fund does not necessarily invest in all of the bonds in the index, or in the same weightings. The Fund may invest in bonds not included in the Aggregate Bond Index which are selected to reflect characteristics such as maturity, duration, or credit quality similar to the Aggregate Bond Index. The Fund also may trade securities in segments of the portfolio to the extent necessary to closely mirror the duration of corresponding segments of the Index. As a result, the Fund may have different levels of interest rate, credit or prepayment risks from the levels of risks in the index. In addition, the Fund may have a higher portfolio turnover rate than that of other “index” funds.

The Fund intends to be diversified in approximately the same proportion as the Aggregate Bond Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Aggregate Bond Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the Aggregate Bond Index.

2. The information under the heading “Principal Risks” on page 3 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the Aggregate Bond Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the Aggregate Bond Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide International Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 8 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the MSCI EAFE^® Index before the deduction of Fund expenses. The MSCI EAFE^® Index includes equity securities of large- and mid‑cap companies located in Europe, Australia and Asia (including the Far East). Under normal circumstances, the Fund invests at least 80% of its net assets in a statistically selected sampling of securities of companies included in the MSCI EAFE^® Index. The Fund will, under normal circumstances, invest in all of the countries represented in the MSCI EAFE^® Index. The Fund may not, however, invest in all the companies within a country represented in the MSCI EAFE^® Index, or in the same weightings as in the MSCI EAFE^® Index.

The Fund intends to be diversified in approximately the same proportion as the MSCI EAFE^® Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the MSCI EAFE^® Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the MSCI EAFE^® Index.

2. The information under the heading “Principal Risks” on page 8 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the MSCI EAFE^® Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the MSCI EAFE^® Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide Mid Cap Market Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 12 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the S&P MidCap 400^® Index before the deduction of Fund expenses. The S&P MidCap 400^® Index includes equity securities of approximately 400 mid‑cap U.S. companies in a wide range of businesses. Under normal circumstances, the Fund invests at least 80% of its net assets in securities of companies included in the S&P MidCap 400^® Index. The Fund does not necessarily invest in all of the securities included in the S&P MidCap 400^® Index or in the same weightings.

The Fund intends to be diversified in approximately the same proportion as the S&P MidCap 400^® Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the S&P MidCap 400^® Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the S&P MidCap 400^® Index.

2. The information under the heading “Principal Risks” on page 12 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the S&P MidCap 400^® Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the S&P MidCap 400^® Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide NYSE ARCA Tech 100 Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 16 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund seeks to track the total return of the NYSE Arca Tech 100 Index, before deducting for Fund expenses. The NYSE Arca Tech 100 Index, which consists of at least 100 individual technology-related securities, is a price-weighted index of stocks of companies from different industries that produce or deploy innovative technologies to conduct their business. The market capitalizations of the companies in the NYSE Arca Tech 100 Index range from small- to large-capitalization companies.

To pursue its principal investment strategy, the Fund, under normal market conditions, invests substantially all (at least 90%) of its net assets in nearly all of the component equity securities included in the NYSE Arca Tech 100 Index in approximately the same proportions as they are represented in the NYSE Arca Tech 100 Index. The largest component of the NYSE Arca Tech 100 Index consists of companies in the technology sector, such as companies in the software, hardware and semiconductor industries. However, the NYSE Arca Tech 100 Index also includes companies in numerous other industries, such as aerospace and defense, health care equipment, biotechnology and others. Because the NYSE Arca Tech 100 Index includes securities from several technology industries, the Fund is permitted to invest more than 25% of its net assets in securities of companies in the technology sector.

The Fund intends to be diversified in approximately the same proportion as the NYSE Arca Tech 100 Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the NYSE Arca Tech 100 Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the NYSE Arca Tech 100 Index.

2. The information under the heading “Principal Risks” on page 16 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the NYSE Arca Tech 100 Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the NYSE Arca Tech 100 Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide Small Cap Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 23 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the Russell 2000^® Index before the deduction of Fund expenses. The Russell 2000^® Index is composed of equity securities of approximately 2,000 small‑cap U.S. companies in a wide range of businesses. To the extent that the Russell 2000^® Index emphasizes certain sectors, the Fund will likely similarly emphasize any such sectors. Under normal circumstances, the Fund invests at least 80% of its net assets in a statistically selected sampling of securities of companies included in the Russell 2000^® Index. The Fund does not necessarily invest in all of the securities included in the Russell 2000^® Index or in the same weightings.

The Fund intends to be diversified in approximately the same proportion as the Russell 2000^® Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Russell 2000^® Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the Russell 2000^® Index.

2. The information under the heading “Principal Risks” on page 23 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the Russell 2000^® Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the Russell 2000^® Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide Bond Index Fund

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

NATIONWIDE MUTUAL FUNDS

Nationwide Bond Index Fund

Supplement dated January 9, 2026

to the Prospectus dated February 28, 2025

Capitalized terms and certain other terms used in this supplement, unless otherwise defined in this supplement, have the meanings assigned to them in the Prospectus.

Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund

Each of the Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund (each a “Fund”) is updating its diversification policy under the Investment Company Act of 1940, as amended. Under the revised policy, each Fund will continue to track its respective index even if the Fund operates as nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents of its respective index.

Shareholder approval will not be sought if a Fund crosses from diversified to nondiversified status under such circumstances.

Nationwide Bond Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 3 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the Aggregate Bond Index before the deduction of Fund expenses. The Aggregate Bond Index represents a wide spectrum of public, investment grade, debt securities in the United States, including government, corporate, and international dollar-denominated bonds, as well as mortgage-backed securities. Some of these securities may be purchased with delayed delivery. Under normal circumstances, the Fund invests at least 80% of its net assets in a statistically selected sampling of bonds and other debt securities that are included in or correlated with the Aggregate Bond Index. The Fund does not necessarily invest in all of the bonds in the index, or in the same weightings. The Fund may invest in bonds not included in the Aggregate Bond Index which are selected to reflect characteristics such as maturity, duration, or credit quality similar to the Aggregate Bond Index. The Fund also may trade securities in segments of the portfolio to the extent necessary to closely mirror the duration of corresponding segments of the Index. As a result, the Fund may have different levels of interest rate, credit or prepayment risks from the levels of risks in the index. In addition, the Fund may have a higher portfolio turnover rate than that of other “index” funds.

The Fund intends to be diversified in approximately the same proportion as the Aggregate Bond Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Aggregate Bond Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the Aggregate Bond Index.

2. The information under the heading “Principal Risks” on page 3 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the Aggregate Bond Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the Aggregate Bond Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide International Index Fund

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

NATIONWIDE MUTUAL FUNDS

Nationwide International Index Fund

Supplement dated January 9, 2026

to the Prospectus dated February 28, 2025

Capitalized terms and certain other terms used in this supplement, unless otherwise defined in this supplement, have the meanings assigned to them in the Prospectus.

Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund

Each of the Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund (each a “Fund”) is updating its diversification policy under the Investment Company Act of 1940, as amended. Under the revised policy, each Fund will continue to track its respective index even if the Fund operates as nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents of its respective index.

Shareholder approval will not be sought if a Fund crosses from diversified to nondiversified status under such circumstances.

Nationwide International Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 8 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the MSCI EAFE^® Index before the deduction of Fund expenses. The MSCI EAFE^® Index includes equity securities of large- and mid‑cap companies located in Europe, Australia and Asia (including the Far East). Under normal circumstances, the Fund invests at least 80% of its net assets in a statistically selected sampling of securities of companies included in the MSCI EAFE^® Index. The Fund will, under normal circumstances, invest in all of the countries represented in the MSCI EAFE^® Index. The Fund may not, however, invest in all the companies within a country represented in the MSCI EAFE^® Index, or in the same weightings as in the MSCI EAFE^® Index.

The Fund intends to be diversified in approximately the same proportion as the MSCI EAFE^® Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the MSCI EAFE^® Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the MSCI EAFE^® Index.

2. The information under the heading “Principal Risks” on page 8 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the MSCI EAFE^® Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the MSCI EAFE^® Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide Mid Cap Market Index Fund

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

NATIONWIDE MUTUAL FUNDS

Nationwide Mid Cap Market Index Fund

Supplement dated January 9, 2026

to the Prospectus dated February 28, 2025

Capitalized terms and certain other terms used in this supplement, unless otherwise defined in this supplement, have the meanings assigned to them in the Prospectus.

Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund

Each of the Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund (each a “Fund”) is updating its diversification policy under the Investment Company Act of 1940, as amended. Under the revised policy, each Fund will continue to track its respective index even if the Fund operates as nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents of its respective index.

Shareholder approval will not be sought if a Fund crosses from diversified to nondiversified status under such circumstances.

Nationwide Mid Cap Market Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 12 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the S&P MidCap 400^® Index before the deduction of Fund expenses. The S&P MidCap 400^® Index includes equity securities of approximately 400 mid‑cap U.S. companies in a wide range of businesses. Under normal circumstances, the Fund invests at least 80% of its net assets in securities of companies included in the S&P MidCap 400^® Index. The Fund does not necessarily invest in all of the securities included in the S&P MidCap 400^® Index or in the same weightings.

The Fund intends to be diversified in approximately the same proportion as the S&P MidCap 400^® Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the S&P MidCap 400^® Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the S&P MidCap 400^® Index.

2. The information under the heading “Principal Risks” on page 12 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the S&P MidCap 400^® Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the S&P MidCap 400^® Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide Small Cap Index Fund

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

NATIONWIDE MUTUAL FUNDS

Nationwide Small Cap Index Fund

Supplement dated January 9, 2026

to the Prospectus dated February 28, 2025

Capitalized terms and certain other terms used in this supplement, unless otherwise defined in this supplement, have the meanings assigned to them in the Prospectus.

Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund

Each of the Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund (each a “Fund”) is updating its diversification policy under the Investment Company Act of 1940, as amended. Under the revised policy, each Fund will continue to track its respective index even if the Fund operates as nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents of its respective index.

Shareholder approval will not be sought if a Fund crosses from diversified to nondiversified status under such circumstances.

Nationwide Small Cap Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 23 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund employs a “passive” management, or indexing, approach, which seeks to match approximately the performance of the Russell 2000^® Index before the deduction of Fund expenses. The Russell 2000^® Index is composed of equity securities of approximately 2,000 small‑cap U.S. companies in a wide range of businesses. To the extent that the Russell 2000^® Index emphasizes certain sectors, the Fund will likely similarly emphasize any such sectors. Under normal circumstances, the Fund invests at least 80% of its net assets in a statistically selected sampling of securities of companies included in the Russell 2000^® Index. The Fund does not necessarily invest in all of the securities included in the Russell 2000^® Index or in the same weightings.

The Fund intends to be diversified in approximately the same proportion as the Russell 2000^® Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the Russell 2000^® Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the Russell 2000^® Index.

2. The information under the heading “Principal Risks” on page 23 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the Russell 2000^® Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the Russell 2000^® Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.

Nationwide NYSE Arca Tech 100 Index Fund

Prospectus [Line Items]

Supplement to Prospectus [Text Block]

NATIONWIDE MUTUAL FUNDS

Nationwide NYSE Arca Tech 100 Index Fund

Supplement dated January 9, 2026

to the Prospectus dated February 28, 2025

Capitalized terms and certain other terms used in this supplement, unless otherwise defined in this supplement, have the meanings assigned to them in the Prospectus.

Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund

Each of the Nationwide Bond Index Fund, Nationwide International Index Fund, Nationwide Mid Cap Market Index Fund, Nationwide NYSE Arca Tech 100 Index Fund and Nationwide Small Cap Index Fund (each a “Fund”) is updating its diversification policy under the Investment Company Act of 1940, as amended. Under the revised policy, each Fund will continue to track its respective index even if the Fund operates as nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents of its respective index.

Shareholder approval will not be sought if a Fund crosses from diversified to nondiversified status under such circumstances.

Nationwide NYSE ARCA Tech 100 Index Fund

Effective immediately, the Prospectus is amended as follows:

1. The information under the heading “Principal Investment Strategies” on page 16 of the Prospectus is deleted in its entirety and replaced with the following:

The Fund seeks to track the total return of the NYSE Arca Tech 100 Index, before deducting for Fund expenses. The NYSE Arca Tech 100 Index, which consists of at least 100 individual technology-related securities, is a price-weighted index of stocks of companies from different industries that produce or deploy innovative technologies to conduct their business. The market capitalizations of the companies in the NYSE Arca Tech 100 Index range from small- to large-capitalization companies.

To pursue its principal investment strategy, the Fund, under normal market conditions, invests substantially all (at least 90%) of its net assets in nearly all of the component equity securities included in the NYSE Arca Tech 100 Index in approximately the same proportions as they are represented in the NYSE Arca Tech 100 Index. The largest component of the NYSE Arca Tech 100 Index consists of companies in the technology sector, such as companies in the software, hardware and semiconductor industries. However, the NYSE Arca Tech 100 Index also includes companies in numerous other industries, such as aerospace and defense, health care equipment, biotechnology and others. Because the NYSE Arca Tech 100 Index includes securities from several technology industries, the Fund is permitted to invest more than 25% of its net assets in securities of companies in the technology sector.

The Fund intends to be diversified in approximately the same proportion as the NYSE Arca Tech 100 Index is diversified. The Fund may become “nondiversified,” as defined in the Investment Company Act of 1940 Act, as amended (the “1940 Act”), solely as a result of a change in relative market capitalization or index weighting of one or more constituents of the NYSE Arca Tech 100 Index. A “nondiversified” fund generally invests a greater proportion of its assets in the securities of one or more issuers and invests overall in a smaller number of issuers than a diversified fund. Shareholder approval will not be sought if the Fund becomes nondiversified due solely to a change in the relative market capitalization or index weighting of one or more constituents of the NYSE Arca Tech 100 Index.

2. The information under the heading “Principal Risks” on page 16 of the Prospectus is amended to include the following:

Nondiversified fund risk – in seeking to track the NYSE Arca Tech 100 Index, the Fund may become nondiversified as a result of a change in relative market capitalization or index weighting of one or more constituents in the NYSE Arca Tech 100 Index. Because the Fund may hold larger positions in fewer securities than diversified funds, a single security’s increase or decrease in value may have a greater impact on the Fund’s value and total return.