As with all mutual funds, the Securities and Exchange Commission has not approved or disapproved
these securities or passed upon the adequacy of this prospectus. Any representation to the contrary is
a criminal offense.

This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and examples below.

^* The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has agreed in its management agreement with the fund to: (1) pay all of the fund's direct expenses, except management fees, shareholder services plan fees and certain other expenses, including the fees and expenses of the non-interested board members and the fees and expenses of counsel to the fund and to the non-interested board members, and (2) reduce its fee pursuant to the management agreement in an amount equal to the fund's allocable portion of the fees and expenses of the non-interested board members and the fees and expenses of counsel to the fund and to the non-interested board members (in the amount of .01% for the past fiscal year). These provisions in the management agreement may not be amended without the approval of the fund's shareholders.

The Example is intended to help you compare the cost of investing in the fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the fund for the time periods indicated and then hold or redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the fund's operating expenses remain the same. The examples are based on net operating expenses, which reflect the contractual undertaking by BNY Mellon Investment Adviser, Inc. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

The fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover may indicate higher transaction costs and may result in higher taxes when fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the fund's performance. During the most recent fiscal year, the fund's portfolio turnover rate was 1.98% of the average value of its portfolio.

To pursue its goal, the fund generally is fully invested in stocks included in the S&P 500^{^®} Index and in futures whose performance is tied to the index. The fund generally invests in all of the stocks in the S&P 500^{^®} Index in proportion to their weighting in the index.

Because the fund has expenses, performance will tend to be slightly lower than that of the S&P 500^{^®} Index. The fund attempts to have a correlation between its performance and that of the S&P 500^{^®} Index of at least .95, before fees and expenses. A correlation of 1.00 would mean that the fund and the index were perfectly correlated.

The S&P 500^{^®} Index is an unmanaged index of the common stocks of 500 companies chosen to reflect the industries of the U.S. economy and is often considered a proxy for the stock market in general. S&P weights each company's stock in the index by its market capitalization (i.e., the share price times the number of shares outstanding), adjusted by the number of available float shares (i.e., those shares available to public investors). Companies included in the S&P 500^{^®} Index generally must have market capitalizations of $15.8 billion or greater, to the extent consistent with market conditions.

"Standard & Poor's^{^®}," "S&P^{^®}," "Standard & Poor's 500^{^®}" and "S&P 500^{^®}" are trademarks of Standard & Poor's Financial Services LLC and have been licensed for use by the fund. The fund is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the fund.

An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. It is not a complete investment program. The fund's share price fluctuates, sometimes dramatically, which means you could lose money.

● Indexing strategy risk. The fund uses an indexing strategy. It does not attempt to manage market volatility, use defensive strategies or reduce the effects of any long-term periods of poor index performance. The correlation between fund and index performance may be affected by the fund's expenses, changes in securities markets, changes in the composition of the index and the timing of purchases and redemptions of fund shares.

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's shares from year to year. The table compares the average annual total returns of the fund's shares to those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.im.bnymellon.com.

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 the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts.

The fund's investment adviser is BNY Mellon Investment Adviser, Inc. (BNYM Investment Adviser).

David France, CFA, Todd Frysinger, CFA, Vlasta Sheremeta, CFA, Michael Stoll and Marlene Walker Smith are the fund's primary portfolio managers, positions they have held since October 2020. Messrs. France, Frysinger and Stoll and Ms. Sheremeta are each a senior vice president and senior portfolio manager at Mellon Investments Corporation (Mellon), an affiliate of BNYM Investment Adviser. Ms. Walker Smith is a director and head of equity index portfolio management at Mellon. Messrs. France, Frysinger and Stoll and Mses. Sheremeta and Walker Smith also are employees of BNYM Investment Adviser.

In general, the fund's minimum initial investment is $2,500 and the minimum subsequent investment is $100. You may sell (redeem) your shares on any business day by calling 1-800-373-9387 (inside the U.S. only) or by visiting www.im.bnymellon.com. If you invested in the fund through a third party, such as a bank, broker-dealer or financial adviser, or through a Retirement Plan (as defined below), you may mail your request to sell shares to BNY Mellon Institutional Department, P.O. Box 534442, Pittsburgh, Pennsylvania 15253-4442. If you invested directly through the fund, you may mail your request to sell shares to BNY Mellon Shareholder Services, P.O. Box 534434, Pittsburgh, Pennsylvania 15253-4434. If you are an Institutional Direct accountholder, please contact your BNY Mellon relationship manager for instructions.

Retirement Plans include qualified or non-qualified employee benefit plans, such as 401(k), 403(b)(7), Keogh, pension, profit-sharing and other deferred compensation plans, whether established by corporations, partnerships, sole proprietorships, non-profit entities, trade or labor unions, or state and local governments, but do not include IRAs (including, without limitation, traditional IRAs, Roth IRAs, Coverdell Education Savings Accounts, IRA "Rollover Accounts" or IRAs set up under Simplified Employee Pension Plans (SEP-IRAs), Salary Reduction Simplified Employee Pension Plans (SARSEPs) or Savings Incentive Match Plans for Employees (SIMPLE IRAs)).

The fund's distributions are taxable as ordinary income or capital gains, except when your investment is through an IRA, Retirement Plan or other U.S. tax-advantaged investment plan (in which case you may be taxed upon withdrawal of your investment from such account).

If you purchase shares through a broker-dealer or other financial intermediary (such as a bank), the fund's distributor and its related companies may pay the intermediary for the sale of fund shares and related services. To the extent that the intermediary may receive lesser or no payments in connection with the sale of other investments, the payments from the fund's distributor and its related companies may create a potential conflict of interest by influencing the broker-dealer or other intermediary and your financial representative to recommend the fund over the other investments. This potential conflict of interest may be addressed by policies, procedures or practices adopted by the financial intermediary. As there may be many different policies, procedures or practices adopted by different intermediaries to address the manner in which compensation is earned through the sale of investments or the provision of related services, the compensation rates and other payment arrangements that may apply to a financial intermediary and its representatives may vary by intermediary. Ask your financial representative or visit your financial intermediary's website for more information.

^* The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has agreed in its management agreement with the fund to: (1) pay all of the fund's direct expenses, except management fees, shareholder services plan fees and certain other expenses, including the fees and expenses of the non-interested board members and the fees and expenses of counsel to the fund and to the non-interested board members, and (2) reduce its fees pursuant to the management agreement in an amount equal to the fund's allocable portion of the fees and expenses of the non-interested board members and the fees and expenses of counsel to the fund and to the non-interested board members (in the amount of .01% for the past fiscal year). These provisions in the management agreement may not be amended without the approval of the fund's shareholders.

The S&P MidCap 400^{^®} Index is an unmanaged index of the common stocks of 400 mid-sized companies. S&P weights each company's stock in the index by its market capitalization (i.e., the share price times the number of shares outstanding), adjusted by the number of available float shares (i.e., those shares available to public investors). Companies included in the S&P MidCap 400^{^®} Index generally have market capitalizations ranging between approximately $5.8 billion and $15.8 billion, to the extent consistent with market conditions.

● Small and midsize company risk. Small and midsize companies carry additional risks because the operating histories of these companies tend to be more limited, their earnings and revenues less predictable (and some companies may be experiencing significant losses), and their share prices more volatile than those of larger, more established companies. The shares of smaller companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the fund's ability to sell these securities.

The following bar chart and table provide some indication of the risks of investing in the fund. The bar chart shows changes in the performance of the fund's Investor shares from year to year. The table compares the average annual total returns of the fund's shares to those of a broad measure of market performance. The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Performance for each share class will vary due to differences in expenses. More recent performance information may be available at www.im.bnymellon.com. Prior to August 31, 2016, the fund's Investor shares were undesignated.

For the fund's Class I shares, periods prior to the inception date reflect the performance of the fund's Investor shares. Such performance figures have not been adjusted to reflect applicable class fees and expenses of Class I shares. Each share class is invested in the same portfolio of securities, and the annual returns would have differed only to the extent that the classes have different expenses.


Average Annual Total Returns (as of 12/31/23)
Class (Inception Date)	1 Year	5 Years	10 Years
Investor Shares returns before taxes	15.89%	12.06%	8.76%
Investor Shares returns after taxes on distributions	13.54%	9.02%	6.02%
Investor Shares returns after taxes on distributions and sale of fund shares	11.07%	9.26%	6.51%
Class I Shares (8/31/16) returns before taxes	16.21%	12.34%	8.96%
S&P MidCap 400^{^®} Index reflects no deductions for fees, expenses or taxes	16.44%	12.62%	9.27%

The fund's investment adviser is BNY Mellon Investment Adviser, Inc. (BNYM Investment Adviser).

David France, CFA, Todd Frysinger, CFA, Vlasta Sheremeta, CFA, Michael Stoll, and Marlene Walker Smith are the fund's primary portfolio managers, positions they have held since October 2020. Messrs. France, Frysinger and Stoll and Ms. Sheremeta are each a senior vice president and senior portfolio manager at Mellon Investments Corporation (Mellon), an affiliate of BNYM Investment Adviser. Ms. Walker Smith is a director and head of equity index portfolio management at Mellon. Messrs. France, Frysinger and Stoll and Mses. Sheremeta and Walker Smith also are employees of BNYM Investment Adviser.

In general, for Investor shares and Class I shares, the fund's minimum initial investment is $2,500 and $1,000, respectively, and the minimum subsequent investment is $100. You may sell (redeem) your shares on any business day by calling 1-800-373-9387 (inside the U.S. only) or by visiting www.im.bnymellon.com. If you invested in the fund through a third party, such as a bank, broker-dealer or financial adviser, or through a Retirement Plan (as defined below), you may mail your request to sell shares to BNY Mellon Institutional Department, P.O. Box 534442, Pittsburgh, Pennsylvania 15253-4442. If you invested directly through the fund, you may mail your request to sell shares to BNY Mellon Shareholder Services, P.O. Box 534434, Pittsburgh, Pennsylvania 15253-4434. If you are an Institutional Direct accountholder, please contact your BNY Mellon relationship manager for instructions.

Accounts" or IRAs set up under Simplified Employee Pension Plans (SEP-IRAs), Salary Reduction Simplified Employee Pension Plans (SARSEPs) or Savings Incentive Match Plans for Employees (SIMPLE IRAs)).

To pursue its goal, the fund generally is fully invested in all of the stocks that comprise the S&P SmallCap 600^{^®} Index and in futures whose performance is tied to the index. The fund generally invests in all of the stocks in the index in proportion to their weighting in the index; however, at times, the fund may invest in a representative sample of stocks

included in the index and in futures whose performance is tied to the index. Under these circumstances, the fund expects to invest in approximately 500 or more of the stocks in the index.

Because the fund has expenses, performance will tend to be slightly lower than that of the S&P SmallCap 600^{^®} Index. The fund attempts to have a correlation between its performance and that of the S&P SmallCap 600^{^®} Index of at least .95, before fees and expenses. A correlation of 1.00 would mean that the fund and the index were perfectly correlated.

The S&P SmallCap 600^{^®} Index is an unmanaged index of the common stocks of 600 small-sized companies in the U.S. S&P weights each company's stock in the index by its market capitalization (i.e., the share price times the number of shares outstanding), adjusted by the number of available float shares (i.e., those shares available to public investors). Companies included in the S&P SmallCap 600^{^®} Index generally have market capitalizations ranging between approximately $900 million and $5.8 billion, to the extent consistent with market conditions.

"Standard & Poor's^{^®}," "S&P^{^®}" and "S&P SmallCap 600^{^®} Index" are trademarks of Standard & Poor's Financial Services LLC and have been licensed for use by the fund. The fund is not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in the fund.

● Indexing strategy risk. The fund uses an indexing strategy. It does not attempt to manage market volatility, use defensive strategies or reduce the effects of any long-term periods of poor index performance. The correlation between fund and index performance may be affected by the fund's expenses and/or use of sampling techniques, changes in securities markets, changes in the composition of the index and the timing of purchases and redemptions of fund shares.

After-tax performance is shown only for Investor shares. After-tax performance of the fund's other share class will vary. 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 the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through U.S. tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Returns after taxes on distributions and sale of fund shares may be higher than returns before taxes or returns after taxes on distributions due to an assumed tax benefit from losses on a sale of the fund's shares at the end of the period.

The fund's investment adviser is BNY Mellon Investment Adviser, Inc. (BNYM Investment Adviser).

The fund seeks to match the performance of the Morgan Stanley Capital International Europe, Australasia, Far East (MSCI EAFE^{^®}) Index.

To pursue its goal, the fund generally is fully invested in stocks included in the Morgan Stanley Capital International Europe, Australasia, Far East (MSCI EAFE^{^®}) Index and in futures whose performance is tied to certain countries included in the index. The fund generally invests in all stocks included in the index. The fund's investments are selected to match the benchmark composition along individual name, country and industry weighting, and other benchmark characteristics. Under these circumstances, the fund maintains approximately the same weighting for each stock as the index does.

Because the fund has expenses, performance will tend to be slightly lower than that of the MSCI EAFE^{^®} Index. The fund attempts to have a correlation between its performance and that of the MSCI EAFE^{^®} Index of at least .95, before fees and expenses. A correlation of 1.00 would mean that the fund and the index were perfectly correlated.

● Foreign investment risk. To the extent the fund invests in foreign securities, the fund's performance will be influenced by political, social and economic factors affecting investments in foreign issuers. Special risks associated with investments in foreign issuers include exposure to currency fluctuations, less liquidity, less developed or less efficient trading markets, lack of comprehensive company information, political and economic instability and differing auditing and legal standards.

● Foreign currency risk. Investments in foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedged positions, that the U.S. dollar will decline relative to the currency being hedged. Foreign currencies are also subject to risks caused by inflation, interest rates, budget deficits and low savings rates, political factors and government intervention and controls.

class will vary due to differences in expenses. More recent performance information may be available at www.im.bnymellon.com. Prior to August 31, 2016, the fund's Investor shares were undesignated.

The fund's investment adviser is BNY Mellon Investment Adviser, Inc. (BNYM Investment Adviser).

(including, without limitation, traditional IRAs, Roth IRAs, Coverdell Education Savings Accounts, IRA "Rollover Accounts" or IRAs set up under Simplified Employee Pension Plans (SEP-IRAs), Salary Reduction Simplified Employee Pension Plans (SARSEPs) or Savings Incentive Match Plans for Employees (SIMPLE IRAs)).

The BNY Mellon Index Funds invest in various types of stocks using an indexing approach. Each fund seeks to match the performance of a different stock market index, as described in the following pages.

In managing their portfolios, the funds do not rely on the professional judgment of a portfolio manager for decisions about asset allocation or securities selections, as do actively managed funds. Instead, each fund looks to its respective index in determining which securities to hold, and in what proportion, using an indexing approach.

Indexing has the potential to eliminate some of the risks of active management, and to increase an investor's after-tax performance. At the same time, indexing also means that a fund does not have the option of changing its strategy, even at times when it may appear advantageous to do so.

Throughout this prospectus, references to the "fund" apply to all of the index funds, unless otherwise noted.

The fund seeks to match the performance of the S&P 500^{^®} Index. To pursue its goal, the fund generally is fully invested in stocks included in the S&P 500^{^®} Index and in futures whose performance is tied to the index. In addition to investing in futures, the fund may invest in exchange-traded funds (ETFs) whose performance is tied to the index. Typically, these investments may be made when the fund's available cash balances cannot otherwise be efficiently or effectively invested directly (due to, for example, size or timing considerations).

The fund attempts to have a correlation between its performance and that of the index of at least .95, before fees and expenses. A correlation of 1.00 would mean that the fund and the index were perfectly correlated.

The fund generally invests in all of the stocks in the S&P 500^{^®} Index in proportion to their weighting in the index. The S&P 500^{^®} Index is an unmanaged index of the common stocks of 500 companies chosen to reflect the industries of the U.S. economy and is often considered a proxy for the stock market in general. S&P weights each company's stock in the index by its market capitalization (i.e., the share price times the number of shares outstanding), adjusted by the number of available float shares (i.e., those shares available to public investors). As a result, larger companies generally have greater representation in the index than small companies. Companies included in the S&P 500^{^®} Index generally must have market capitalizations of $15.8 billion or greater, to the extent consistent with market conditions.

The fund, to a limited extent, may use derivative instruments, such as stock index futures, as a substitute for the sale or purchase of securities. A derivatives contract will obligate or entitle the fund to deliver or receive an asset or cash payment based on the change in value of the underlying asset. The fund is required to limit its derivatives exposure so that the total notional value of derivatives does not exceed 10% of the fund's net assets, and is subject to certain reporting requirements.

More information about the fund's portfolio securities and investment techniques, and associated risks, is provided in the fund's Statement of Additional Information.

The fund seeks to match the performance of the S&P MidCap 400^{^®} Index. To pursue its goal, the fund generally is fully invested in stocks included in the S&P MidCap 400^{^®} Index and in futures whose performance is tied to the index. In addition to investing in futures, the fund may invest in exchange-traded funds (ETFs) whose performance is tied to the index. Typically, these investments may be made when the fund's available cash balances cannot otherwise be efficiently or effectively invested directly (due to, for example, size or timing considerations).

The fund generally invests in all of the stocks in the S&P MidCap 400^{^®} Index in proportion to their weighting in the index. The S&P MidCap 400^{^®} Index is an unmanaged index of the common stocks of 400 mid-sized companies. S&P weights each company's stock in the index by its market capitalization (i.e., the share price times the number of shares outstanding), adjusted by the number of available float shares (i.e., those shares available to public investors). As a

result, larger companies generally have greater representation in the index than small companies. Companies included in the S&P MidCap 400^{^®} Index generally have market capitalizations ranging between approximately $5.8 billion and $15.8 billion, to the extent consistent with market conditions.

More information about the fund's portfolio securities and investment techniques, and associated risks, is provided in the fund's Statement of Additional Information.

The fund seeks to match the performance of the S&P SmallCap 600^{^®} Index. To pursue its goal, the fund generally is fully invested in all of the stocks that comprise the S&P SmallCap 600^{^®} Index and in futures whose performance is tied to the index. The fund generally invests in all of the stocks in the index in proportion to their weighting in the index; however, at times, the fund may invest in a representative sample of stocks included in the index and in futures whose performance is tied to the index. Under these circumstances, the fund expects to invest in approximately 500 or more of the stocks in the index. Sampling is a statistical process used to select stocks based on market capitalization, industry representation and other means so that the portfolio has investment characteristics that closely approximate those of the index. In addition to investing in futures, the fund may invest in exchange-traded funds (ETFs) whose performance is tied to the index. Typically, these investments may be made when the fund's available cash balances cannot otherwise be efficiently or effectively invested directly (due to, for example, size or timing considerations).

The S&P SmallCap 600^{^®} Index is an unmanaged index of the common stocks of 600 small-sized companies in the U.S. S&P weights each company's stock in the index by its market capitalization (i.e., the share price times the number of shares outstanding), adjusted by the number of available float shares (i.e., those shares available to public investors). As a result, larger companies generally have greater representation in the index than small companies. Companies included in the S&P SmallCap 600^{^®} Index generally have market capitalizations ranging between approximately $900 million and $5.8 billion, to the extent consistent with market conditions.

More information about the fund's portfolio securities and investment techniques, and associated risks, is provided in the fund's Statement of Additional Information.

"Standard & Poor's^{^®}," "S&P^{^®}," "Standard & Poor's^{^®} 500," "S&P 500^{^®}," " S&P MidCap 400^{^®} Index" and " S&P SmallCap 600^{^®} Index" are trademarks of Standard & Poor's Financial Services LLC, and have been licensed for use by the respective fund. The funds are not sponsored, endorsed, sold or promoted by Standard & Poor's and Standard & Poor's makes no representation regarding the advisability of investing in any fund.

The fund seeks to match the performance of the MSCI EAFE^{^®} Index. To pursue its goal, the fund generally is fully invested in stocks included in the MSCI EAFE^{^®} Index and in futures whose performance is tied to certain countries included in the index. In addition to investing in futures, the fund may invest in exchange-traded funds (ETFs) whose performance is tied to the index. Typically, these investments may be made when the fund's available cash balances cannot otherwise be efficiently or effectively invested directly (due to, for example, size or timing considerations).

The fund generally invests in all stocks included in the MSCI EAFE^{^®} Index. The fund's investments are selected to match the benchmark composition along individual name, country and industry weighting, and other benchmark characteristics. Under these circumstances, the fund maintains approximately the same weighting for each stock as the index does.

The MSCI EAFE^{^®} Index is an unmanaged, free float-adjusted, market capitalization weighted index that is designed to measure the performance of publicly-traded stocks issued by companies in developed markets, excluding the United States and Canada. As of December 30, 2023, the MSCI EAFE^{^®} Index consisted of the following developed market country indices: Australia, Austria, Belgium, Denmark, Finland, France, Germany, Hong Kong, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Singapore, Spain, Sweden, Switzerland and the United Kingdom. Each stock in the index is weighted by its float-adjusted market capitalization. This means that on average larger companies have greater representation in the index than small companies.

The fund, to a limited extent, may invest in futures contracts whose performance is tied to the MSCI EAFE^{^®} Index or local market indices, and may enter into foreign currency forward and futures contracts. These instruments are used primarily as a substitute for the sale or purchase of securities or to maintain the approximate currency exposure of the MSCI EAFE^{^®} Index. Derivatives may be entered into on established exchanges or through privately negotiated transactions referred to as over-the-counter derivatives. A derivatives contract will obligate or entitle the fund to deliver or receive an asset or cash payment based on the change in value of the underlying asset. The fund is required to limit its derivatives exposure so that the total notional value of derivatives does not exceed 10% of the fund's net assets, and is subject to certain reporting requirements.

More information about the fund's portfolio securities and investment techniques, and associated risks, is provided in the fund's Statement of Additional Information.

An investment in a fund is not a bank deposit. It is not insured or guaranteed by the FDIC or any other government agency. It is not a complete investment program. The value of your investment in a fund will fluctuate, sometimes dramatically, which means you could lose money.

● Market risk. The value of the securities in which the fund invests may be affected by political, regulatory, economic and social developments, and developments that impact specific economic sectors, industries or segments of the market. In addition, turbulence in financial markets and reduced liquidity in equity, credit and/or fixed-income markets may negatively affect many issuers, which could adversely affect the fund. Global economies and financial markets are becoming increasingly interconnected, and conditions and events in one country, region or financial market may adversely impact issuers in a different country, region or financial market. These risks may be magnified if certain events or developments adversely interrupt the global supply chain; in these and other circumstances, such risks might affect companies world-wide. A widespread outbreak of an infectious disease, such as COVID-19, and efforts to contain its spread, may result in market volatility, inflation, reduced liquidity or disruption in the trading of certain financial instruments, and systemic economic weakness. To the extent the fund may overweight its investments in certain countries, companies, industries or market sectors, such positions will increase the fund's exposure to risk of loss from adverse developments affecting those countries, companies, industries or sectors.

● Risks of stock investing. Stocks generally fluctuate more in value than bonds and may decline significantly over short time periods. There is the chance that stock prices overall will decline because stock markets tend to move in cycles, with periods of rising prices and falling prices. The market value of a stock may decline due to general market conditions that are not related to the particular company, such as real or perceived adverse economic conditions, changes in the general outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. A security's market value also may decline because of factors that affect the particular company, such as management performance, financial leverage and reduced demand for the company's products or services, or factors that affect the company's industry, such as labor shortages or increased production costs and competitive conditions within an industry.

● Indexing strategy risk. The fund uses an indexing strategy. It does not attempt to manage market volatility, use defensive strategies or reduce the effects of any long-term periods of poor index performance. The correlation between fund and index performance may be affected by the fund's expenses and/or use of sampling techniques, changes in securities markets, changes in the composition of the index and the timing of purchases and redemptions of fund shares.

BNY Mellon Midcap Index Fund and BNY Mellon Smallcap Stock Index Fund also are subject to the following principal risk:

● Small and midsize company risk. Small and midsize companies carry additional risks because the operating histories of these companies tend to be more limited, their earnings and revenues less predictable (and some companies may be experiencing significant losses), and their share prices more volatile than those of larger, more established companies. These companies may have limited product lines, markets or financial resources, or may depend on a limited

management group. The shares of smaller companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the fund's ability to sell these securities. Some of the fund's investments will rise and fall based on investor perception rather than economic factors.

BNY Mellon International Stock Index Fund also is subject to the following principal risks:

● Risk of investing in Japan and the United Kingdom. The MSCI EAFE^{^®} Index may be comprised of a large percentage of securities of companies organized in Japan or the United Kingdom (UK). To the extent the fund invests a significant portion of its assets in the securities of companies organized in Japan or the UK, it is more likely to be impacted by events or conditions affecting those countries. Investments in the Japanese stock market may entail a higher degree of risk than a more diversified international investment. Japan has in the past experienced prolonged periods of economic and investment underperformance. The risk of investing in the UK may be heightened due to the UK's withdrawal from membership in the European Union (known as "Brexit"), which, together with other geopolitical developments, could have a negative impact on both the UK's economy and the economies of the other countries in Europe, as well as greater volatility in the global financial and currency markets.

● Foreign currency risk. Investments in foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedged positions, that the U.S. dollar will decline relative to the currency being hedged. Currency exchange rates may fluctuate significantly over short periods of time. Foreign currencies are also subject to risks caused by inflation, interest rates, budget deficits and low savings rates, political factors and government intervention and controls.

In addition to the principal risks described above, each fund is subject to the following additional risks that are not anticipated to be principal risks of investing in the fund:

● Derivatives risk. A small investment in derivatives, such as futures contracts, could have a potentially large impact on the fund's performance. The use of derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in the underlying assets, and the fund's use of derivatives may result in losses to the fund. Derivatives in which the fund may invest can be highly volatile, illiquid and difficult to value, and there is the risk that changes in the value of a derivative held by the fund will not correlate with the underlying assets or the fund's other investments in the manner intended.

● Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities in a timely manner at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically. Investments that are illiquid or that trade in lower volumes may be more difficult to value. Investments in foreign securities tend to have greater exposure to liquidity risk than domestic securities. Liquidity risk also may refer to the risk that the fund will not be able to pay redemption proceeds within the allowable time period stated in this prospectus because of unusual market conditions, an unusually high volume of redemption requests, or other reasons. To meet redemption requests, the fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may adversely affect the fund's share price.

● Concentration risk. The fund will concentrate its investments (i.e., hold 25% or more of its total assets) in a particular group of industries to approximately the same extent that the index is concentrated. To the extent the fund concentrates in a particular group of industries, it may be more susceptible to economic conditions and risks affecting those industries.

● ETF and other investment company risk. To the extent the fund invests in pooled investment vehicles, such as ETFs and other investment companies, the fund will be affected by the investment policies, practices and performance of such entities in direct proportion to the amount of assets the fund has invested therein. The risks of investing in other investment companies, including ETFs, typically reflect the risks associated with the types of instruments in which the investment companies invest. When the fund invests in an ETF or other investment company, shareholders of the fund will bear indirectly their proportionate share of the expenses of the ETF or other investment company (including management fees) in addition to the expenses of the fund.

In addition to the risks described above, BNY Mellon Smallcap Stock Index Fund is also subject to the following additional risk that is not anticipated to be a principal risk of investing in the fund:

● Index sampling risk. The fund's use of sampling techniques will result in it holding a smaller number of securities than are in the index, and the fund may not track the index as closely as it would if it were fully replicating the index. For example, an adverse development respecting an issuer of securities held by the fund could result in a greater decline in the fund's net asset value than would be the case if the fund held all of the securities in the index. Conversely, a positive development relating to an issuer of securities in the index that is not held by the fund could cause the fund to underperform the index. To the extent the assets in the fund are smaller, these risks will be greater.

The investment adviser for each fund is BNY Mellon Investment Adviser, Inc., 240 Greenwich Street, New York, New York 10286. BNYM Investment Adviser manages approximately $341 billion in 105 mutual fund portfolios. For the past fiscal year, each of BNY Mellon S&P 500 Index Fund, BNY Mellon Midcap Index Fund and BNY Mellon Smallcap Stock Index Fund paid BNYM Investment Adviser a management fee at the effective annual rate of .24% of the value of the fund's average daily net assets, and BNY Mellon International Stock Index Fund paid BNYM Investment Adviser a management fee at the effective annual rate of .34% of the value of the fund's average daily net assets. A discussion regarding the basis for the board's approving each fund's management agreement with BNYM Investment Adviser is available in the respective fund's semi-annual report for the six-month period ended April 30, 2023. BNYM Investment Adviser is the primary mutual fund business of The Bank of New York Mellon Corporation (BNY Mellon), a global investments company dedicated to helping its clients manage and service their financial assets throughout the investment lifecycle. Whether providing financial services for institutions, corporations or individual investors, BNY Mellon delivers informed investment management and investment services in 35 countries. BNY Mellon is a leading investment management and investment services company, uniquely focused to help clients manage and move their financial assets in the rapidly changing global marketplace. BNY Mellon has $47.8 trillion in assets under custody and administration and $2.0 trillion in assets under management. BNY Mellon is the corporate brand of The Bank of New York Mellon Corporation. BNY Mellon Investment Management is one of the world's leading investment management organizations, and one of the top U.S. wealth managers, encompassing BNY Mellon's affiliated investment management firms, wealth management services and global distribution companies. Additional information is available at www.bnymellon.com.

The asset management philosophy of BNYM Investment Adviser is based on the belief that discipline and consistency are important to investment success. For each fund, BNYM Investment Adviser seeks to establish clear guidelines for portfolio management and to be systematic in making decisions. This approach is designed to provide each fund with a distinct, stable identity.

David France, CFA, Todd Frysinger, CFA, Vlasta Sheremeta, CFA, Michael Stoll and Marlene Walker Smith are the funds' primary portfolio managers, positions they have held since October 2020. Messrs. France, Frysinger and Stoll and Mses. Sheremeta and Walker Smith are employees of BNYM Investment Adviser and Mellon Investments Corporation, an affiliate of BNYM Investment Adviser, and are jointly and primarily responsible for managing the funds' portfolios. Mr. France is a senior vice president and senior portfolio manager at Mellon. He has been employed by Mellon or a predecessor company of Mellon since 2009, and by BNYM Investment Adviser since November 2017. Mr. Frysinger is a senior vice president and senior portfolio manager at Mellon. He has been employed by Mellon or a predecessor company of Mellon since 2007, and by BNYM Investment Adviser since September 2020. Ms. Sheremeta is a senior vice president and senior portfolio manager at Mellon. She has been employed by Mellon or a predecessor company of Mellon since 2011, and by BNYM Investment Adviser since September 2020. Mr. Stoll is a senior vice president and senior portfolio manager at Mellon. He has been employed by Mellon or a predecessor company of Mellon since 2005, and by BNYM Investment Adviser since September 2020. Ms. Walker Smith is a director and head of equity index portfolio management at Mellon. She has been employed by Mellon or a predecessor company of Mellon since 1995, and by BNYM Investment Adviser since 2010. Messrs. France, Frysinger and Stoll and Mses. Sheremeta and Walker Smith manage the funds in their capacity as employees of BNYM Investment Adviser.

The fund's Statement of Additional Information (SAI) provides additional portfolio manager information including compensation, other accounts managed and ownership of fund shares.

BNY Mellon Securities Corporation (BNYMSC), a wholly-owned subsidiary of BNYM Investment Adviser, serves as distributor of the funds and of the other funds in the BNY Mellon Family of Funds. Any Rule 12b-1 fees and shareholder services fees, as applicable, are paid to BNYMSC for financing the sale and distribution of fund shares and for providing shareholder account service and maintenance, respectively. BNYM Investment Adviser or BNYMSC may provide cash payments out of its own resources to financial intermediaries that sell shares of funds in the BNY Mellon Family of Funds or provide other services. Such payments are separate from any sales charges, 12b-1 fees and/or

shareholder services fees or other expenses that may be paid by a fund to those financial intermediaries. Because those payments are not made by fund shareholders or the fund, the fund's total expense ratio will not be affected by any such payments. These payments may be made to financial intermediaries, including affiliates, that provide shareholder servicing, sub-administration, recordkeeping and/or sub-transfer agency services, marketing support and/or access to sales meetings, sales representatives and management representatives of the financial intermediary. Cash compensation also may be paid from BNYM Investment Adviser's or BNYMSC's own resources to financial intermediaries for inclusion of a fund on a sales list, including a preferred or select sales list or in other sales programs. These payments sometimes are referred to as "revenue sharing." From time to time, BNYM Investment Adviser or BNYMSC also may provide cash or non-cash compensation to financial intermediaries or their representatives in the form of occasional gifts; occasional meals, tickets or other entertainment; support for due diligence trips; educational conference sponsorships; support for recognition programs; technology or infrastructure support; and other forms of cash or non-cash compensation permissible under broker-dealer regulations. In some cases, these payments or compensation may create an incentive for a financial intermediary or its employees to recommend or sell shares of the fund to you. This potential conflict of interest may be addressed by policies, procedures or practices that are adopted by the financial intermediary. As there may be many different policies, procedures or practices adopted by different intermediaries to address the manner in which compensation is earned through the sale of investments or the provision of related services, the compensation rates and other payment arrangements that may apply to a financial intermediary and its representatives may vary by intermediary. Please contact your financial representative for details about any payments they or their firm may receive in connection with the sale of fund shares or the provision of services to the fund.

The funds, BNYM Investment Adviser and BNYMSC have each adopted a code of ethics that permits its personnel, subject to such code, to invest in securities, including securities that may be purchased or held by the fund. Each code of ethics restricts the personal securities transactions of employees, and requires portfolio managers and other investment personnel to comply with the code's preclearance and disclosure procedures. The primary purpose of the respective codes is to ensure that personal trading by employees is done in a manner that does not disadvantage the fund or other client accounts.

BNY Mellon S&P 500 Index Fund is offering one class of fund shares in this prospectus. Each of BNY Mellon Midcap Index Fund, BNY Mellon Smallcap Stock Index Fund and BNY Mellon International Stock Index Fund is offering Investor shares and Class I shares in this prospectus. The classes differ in their expenses, eligibility and minimum purchase requirements, and the services they offer to shareholders. Shares of BNY Mellon S&P 500 Index Fund and Investor shares of each other fund are subject to an annual shareholder services plan fee of .25% paid to the funds' distributor for the provision of services to shareholders and/or the maintenance of shareholder accounts. The funds' distributor may pay financial intermediaries from the fees it receives under the shareholder services plan for the provision of such services by the financial intermediaries to their clients who are beneficial owners of such shares of the fund. Financial intermediaries with whom you open a fund account may have different policies and procedures than those described in this prospectus or the SAI. Accordingly, the availability of certain share classes and/or shareholder privileges or services described in this prospectus or the SAI will depend on the policies, procedures and trading platforms of the financial intermediary or Retirement Plan recordkeeper. To be eligible for the share classes and/or shareholder privileges or services described in this prospectus or the SAI, you may need to open a fund account directly with the fund or a financial intermediary that offers such classes and/or privileges or services. Financial intermediaries purchasing fund shares on behalf of their clients determine the class of shares available for their clients. Consult a representative of your financial intermediary or Retirement Plan for further information.

Investor shares are designed primarily for investors who are investing directly through the fund or through entities that have entered into agreements with the fund's distributor to sell Investor shares. Prior to August 31, 2016, Investor shares were undesignated. No rights or privileges changed as a result of the designation.

● bank trust departments, trust companies and insurance companies that have entered into agreements with the fund's distributor to offer Class I shares to their clients

● institutional investors acting in a fiduciary, advisory, agency, custodial or similar capacity for Retirement Plans and SEP-IRAs that have entered into agreements with the fund's distributor to offer Class I shares to such plans

● foundations and endowments that make an initial investment in the fund of at least $1 million

● sponsors of college savings plans that qualify for tax-exempt treatment under Section 529 of the Internal Revenue Code, that maintain an omnibus account with the fund and do not require shareholder tax reporting or 529 account support responsibilities from the fund's distributor

● advisory fee-based accounts offered through financial intermediaries who, depending on the structure of the selected advisory platform, make Class I shares available

● certain institutional clients of a BNY Mellon investment advisory subsidiary, provided that such clients are approved by BNYM Investment Adviser

● U.S.-based employees of BNY Mellon, board members of BNYM Investment Adviser and board members of funds in the BNY Mellon Family of Funds, and the spouse, domestic partner or minor child of any of the foregoing, subject to certain conditions described in the SAI, and provided that such Class I shares are purchased directly from the fund

● clients of financial intermediaries that effect transactions in Class I shares through their brokerage platforms solely as a broker in an agency capacity for their clients and that have entered into an agreement with the fund's distributor. An investor purchasing Class I shares through the brokerage platform of such a financial intermediary will be required to pay a commission and/or other forms of compensation to the financial intermediary

Institutions purchasing fund shares on behalf of their clients determine whether Class I shares will be available for their clients. Accordingly, the availability of Class I shares of the fund will depend on the policies, procedures and trading platforms of the institutional investor.

You pay no sales charges to invest in shares of the fund. Your price for shares is the net asset value (NAV) per share, which is calculated as of the scheduled close of trading on the New York Stock Exchange (NYSE) (usually 4:00 p.m. Eastern time) on days the NYSE is scheduled to be open for regular business.

The NYSE is closed on certain holidays listed in "Determination of NAV" in the SAI. You may buy, exchange or redeem shares at their NAV next calculated after your order is received in proper form by the fund's transfer agent or other authorized entity. "Proper form" refers to completion of an account application (if applicable), satisfaction of requirements in this section (subject to "Shareholder Guide—General Policies") and any applicable conditions in "Additional Information About How to Redeem Shares" in the SAI. Authorized entities other than the fund's transfer agent may apply different conditions for the satisfaction of "proper form" requirements. For more information, consult a representative of your financial intermediary. When calculating NAVs, BNYM Investment Adviser values equity investments on the basis of market quotations or official closing prices. BNYM Investment Adviser generally values fixed-income investments based on values supplied by an independent pricing service approved by the fund's board. The pricing service's procedures are reviewed under the general supervision of the board. If market quotations or official closing prices or valuations from a pricing service are not readily available, or are determined not to reflect accurately fair value, the fund may value those investments at fair value as determined in accordance with procedures approved by the fund's board. Fair value of investments may be determined by BNYM Investment Adviser, as the fund's Valuation Designee, using such information as it deems appropriate under the circumstances. Under certain circumstances, the fair value of foreign equity securities will be provided by an independent pricing service. Using fair value to price investments may result in a value that is different from a security's most recent closing price and from the prices used by other mutual funds to calculate their NAVs. Futures contracts will be valued at the most recent settlement price. Forward currency contracts will be valued using the forward rate obtained from an independent pricing service approved by the fund's board. ETFs will be valued at their market price. Foreign securities held by the fund may trade on days when the fund does not calculate its NAV and thus may affect the fund's NAV on days when investors will not be able to purchase or sell (redeem) fund shares.

Investments in certain types of thinly traded securities may provide short-term traders arbitrage opportunities with respect to the fund's shares. For example, arbitrage opportunities may exist when trading in a portfolio security or securities is halted and does not resume, or the market on which such securities are traded closes before the fund calculates its NAV. If short-term investors in the fund were able to take advantage of these arbitrage opportunities, they could dilute the NAV of fund shares held by long-term investors. Portfolio valuation policies can serve to reduce arbitrage opportunities available to short-term traders, but there is no assurance that such valuation policies will prevent dilution of the fund's NAV by short-term traders. While the fund has a policy regarding frequent trading, it too may not be completely effective to prevent short-term NAV arbitrage trading, particularly in regard to omnibus accounts. Please see "Shareholder Guide — General Policies" for further information about the fund's frequent trading policy.

Orders to buy and sell shares received by an authorized entity (such as a bank, broker-dealer or financial adviser, or Retirement Plan that has entered into an agreement with the fund's distributor) by the time as of which the fund calculates its NAV (usually 4:00 p.m. Eastern time) will be based on the NAV determined that day.

Regular Accounts. To open a regular account, complete an application and mail it, together with a check payable to The BNY Mellon Family of Funds, to the appropriate address below. To purchase additional shares in a regular account, mail a check payable to The BNY Mellon Family of Funds (with your account number on your check), together with an investment slip, to the appropriate address below.

IRA Accounts. To open an IRA account or make additional investments in an IRA account, be sure to specify the fund name and the year for which the contribution is being made. When opening a new account include a completed IRA application applicable to the type of IRA for which the investment is made, and when making additional

investments include an investment slip. Make checks payable to The BNY Mellon Family of Funds, and mail to the appropriate address below.

BNY Mellon Shareholder Services
P.O. Box 534434
Pittsburgh, Pennsylvania 15253-4434

If you are investing through a third party, such as a bank, broker-dealer or financial adviser, or in a Retirement Plan, mail to:

If you are applying for an Institutional Direct account, please contact your BNY Mellon relationship manager for mailing instructions.

Electronic Check or Wire. To purchase shares by wire or electronic check, please call 1-800-373-9387 (inside the U.S. only) for more information.

Telephone or Online. To purchase additional shares by telephone or online, you can call 1-800-373-9387 (inside the U.S. only) or visit www.im.bnymellon.com to request your transaction. In order to do so, you must have elected the TeleTransfer Privilege on your account application or a Shareholder Services Form. See "Services for Fund Investors — Wire Redemption and TeleTransfer Privileges" for more information. Institutional Direct accounts are not eligible for online services.

Automatically. You may purchase additional shares by selecting one of the automatic investment services made available to the fund on your account application or service application. See "Services for Fund Investors – Automatic Services."

Except as set forth below, for Investor shares and Class I shares, the fund's minimum initial investment is $2,500 and $1,000, respectively, and the minimum subsequent investment is $100. The minimum initial investment for Retirement Plans or IRAs (other than Coverdell Education Savings Accounts) sponsored by BNYM Investment Adviser or its affiliates is $750, with no minimum subsequent investment. The minimum initial investment for Coverdell Education Savings Accounts sponsored by BNYM Investment Adviser or its affiliates is $500, with no minimum subsequent investment. Subsequent investments made through TeleTransfer are subject to a $100 minimum and a $150,000 maximum. All investments must be in U.S. dollars. Third-party checks, cash, travelers' checks or money orders will not be accepted. You may be charged a fee for any check that does not clear.

You may sell (redeem) shares at any time. Your shares will be sold at the next NAV calculated after your order is received in proper form by the fund's transfer agent or other authorized entity. Any certificates representing fund shares being sold must be returned with your redemption request. Your order will be processed promptly.

If you request the fund to transmit your redemption proceeds to you by check, the fund expects that your redemption proceeds normally will be sent within two business days after your request is received in proper form. If you request the fund to transmit your redemption proceeds to you by wire via the Wire Redemption Privilege ($1,000 minimum) or electronic check via the TeleTransfer Privilege ($500 minimum), and the fund has your bank account information on file, the fund expects that your redemption proceeds normally will be wired within one business day or sent by electronic check within two business days, as applicable, to your bank account after your request is received in proper form. See "Services for Fund Investors — Wire Redemption and TeleTransfer Privileges" for more information. Payment of redemption proceeds may take longer than the number of days the fund typically expects and may take up to seven days after your order is received in proper form by the fund's transfer agent or other authorized entity, particularly during periods of stressed market conditions or very large redemptions or excessive trading.

The processing of redemptions may be suspended, and the delivery of redemption proceeds may be delayed beyond seven days, depending on the circumstances, for any period: (i) during which the NYSE is closed (other than on holidays or weekends), or during which trading on the NYSE is restricted; (ii) when an emergency exists that makes the disposal of securities owned by the fund or the determination of the fair value of the fund's net assets not reasonably practicable; or (iii) as permitted by order of the Securities and Exchange Commission for the protection of fund shareholders. For these purposes, the Securities and Exchange Commission determines the conditions under which trading shall be deemed to be restricted and an emergency shall be deemed to exist.

Before selling shares recently purchased by check, TeleTransfer or Automatic Asset Builder, please note that:

● if you send a written request to sell such shares, the fund may delay sending the proceeds for up to eight business days following the purchase of those shares or until the fund receives verification of clearance of the funds used to purchase such shares, whichever is earlier

● the fund will not process wire, telephone, online or TeleTransfer redemption requests for up to eight business days following the purchase of those shares or until the fund receives verification of clearance of the funds used to purchase such shares, whichever is earlier

Under normal circumstances, the fund expects to meet redemption requests by using cash it holds in its portfolio or selling portfolio securities to generate cash. In addition, the fund, and certain other funds in the BNY Mellon Family of Funds, may draw upon an unsecured credit facility for temporary or emergency purposes to meet redemption requests. The fund also reserves the right to pay redemption proceeds in securities rather than cash (i.e., "redeem in-kind"), to the extent the composition of the fund's investment portfolio enables it to do so. Generally, a redemption in-kind may be made under the following circumstances: (1) BNYM Investment Adviser determines that a redemption in-kind (i) is more advantageous to the fund (e.g., due to advantageous tax consequences or lower transaction costs) than selling/purchasing portfolio securities, (ii) will not favor the redeeming shareholder to the detriment of any other shareholder or the fund and (iii) is in the best interests of the fund; (2) to manage liquidity risk (i.e., the risk that the fund could not meet redemption requests without significant dilution of remaining investors' interests in the fund); (3) in stressed market conditions; or (4) subject to the approval of the fund's board in other circumstances identified by BNYM Investment Adviser. Securities distributed in connection with any such redemption in-kind are expected to generally represent your pro rata portion of assets held by the fund immediately prior to the redemption, with adjustments as may be necessary in connection with, for example, certain derivatives, restricted securities, odd lots or fractional shares. Any securities distributed in-kind will remain exposed to market risk until sold, and you may incur transaction costs and taxable gain when selling the securities.

Regular Accounts. To redeem shares in a regular account by mail, send a letter of instruction that includes your name, your account number, the name of the fund, the share class, the dollar amount to be redeemed and how and where to send the proceeds. Mail your request to the appropriate address below.

IRA Accounts. To redeem shares in an IRA account by mail, send a letter of instruction that includes all of the same information for regular accounts and indicate whether the distribution is qualified or premature and whether the 10% TEFRA should be withheld. Mail your request to the appropriate address below.

BNY Mellon Shareholder Services
P.O. Box 534434
Pittsburgh, Pennsylvania 15253-4434

If you invested through a third party, such as a bank, broker-dealer or financial adviser, or in a Retirement Plan, mail to:

BNY Mellon Institutional Department
P.O. Box 534442
Pittsburgh, Pennsylvania 15253-4442

If you are an Institutional Direct accountholder, please contact your BNY Mellon relationship manager for mailing instructions.

A medallion signature guarantee is required for some written sell orders. These include:

● amounts of $10,000 or more on accounts whose address has been changed within the last 30 days

A medallion signature guarantee helps protect against fraud. You can obtain one from most banks or securities dealers, but not from a notary public. For joint accounts, each signature must be guaranteed. Please call to ensure that your medallion signature guarantee will be processed correctly.

Telephone or Online. To redeem shares by telephone or online, call 1-800-373-9387 (inside the U.S. only) or, for regular accounts, visit www.im.bnymellon.com to request your transaction. Institutional Direct accounts are not eligible for online services.

By calling 1-800-373-9387 (inside the U.S. only), you may speak to a BNY Mellon representative and request that redemption proceeds be paid by check and mailed to your address of record (maximum $250,000 per day). For redemption requests made online through www.im.bnymellon.com or through the Express voice-activated account access system, there is a $100,000 per day limit.

Automatically. You may sell shares in a regular account by completing an Automatic Withdrawal Form which you can obtain by calling 1-800-373-9387 (inside the U.S. only), visiting www.im.bnymellon.com or contacting your financial representative. For instructions on how to establish automatic withdrawals to sell shares in an IRA account, please call 1-800-373-9387 (inside the U.S. only) or contact your financial representative. See "Services for Fund Investors — Automatic Services."

The fund and the fund's transfer agent are authorized to act on telephone or online instructions from any person representing himself or herself to be you and reasonably believed by the fund or the transfer agent to be genuine. You may be responsible for any fraudulent telephone or online order as long as the fund or the fund's transfer agent (as applicable) takes reasonable measures to confirm that the instructions are genuine.

The fund reserves the right to reject any purchase or exchange request in whole or in part. All shareholder services and privileges offered to shareholders may be modified or terminated at any time, except as otherwise stated in the fund's SAI. Please see the fund's SAI for additional information on buying and selling shares, privileges and other shareholder services.

If you invest through a financial intermediary (rather than directly through the fund), the policies may be different than those described herein. For example, banks, brokers, Retirement Plans, financial advisers and financial supermarkets may charge transaction fees and may set different minimum investments or limitations on buying or selling shares. Please consult your financial representative.

The fund is designed for long-term investors. Frequent purchases, redemptions and exchanges may disrupt portfolio management strategies and harm fund performance by diluting the value of fund shares and increasing brokerage and administrative costs. As a result, BNYM Investment Adviser and the fund's board have adopted a policy of discouraging excessive trading, short-term market timing and other abusive trading practices (frequent trading) that could adversely affect the fund or its operations. BNYM Investment Adviser and the fund will not enter into arrangements with any person or group to permit frequent trading.

● refuse any purchase or exchange request, including those from any individual or group who, in BNYM Investment Adviser's view, is likely to engage in frequent trading

● change or discontinue fund exchanges, or temporarily suspend exchanges during unusual market conditions

More than four roundtrips within a rolling 12-month period generally is considered to be frequent trading. A roundtrip consists of an investment that is substantially liquidated within 60 days. Based on the facts and circumstances of the trades, the fund may also view as frequent trading a pattern of investments that are partially liquidated within 60 days.

Transactions made through the Automatic Withdrawal Plan, Auto-Exchange Privileges, automatic investment plans (including Automatic Asset Builder), automatic non-discretionary rebalancing programs and minimum required retirement distributions generally are not considered to be frequent trading. For Retirement Plans, generally only participant-initiated exchange transactions are subject to the roundtrip limit.

BNYM Investment Adviser monitors selected transactions to identify frequent trading. When its surveillance systems identify multiple roundtrips, BNYM Investment Adviser evaluates trading activity in the account for evidence of frequent trading. BNYM Investment Adviser considers the investor's trading history in other accounts under common ownership or control, in other funds in the BNY Mellon Family of Funds and BNY Mellon Funds Trust and, if known, in non-affiliated mutual funds and accounts under common control. These evaluations involve judgments that are inherently subjective, and while BNYM Investment Adviser seeks to apply the policy and procedures uniformly, it is possible that similar transactions may be treated differently. In all instances, BNYM Investment Adviser seeks to make these judgments to the best of its abilities in a manner that it believes is consistent with shareholder interests. If BNYM Investment Adviser concludes the account is likely to engage in frequent trading, BNYM Investment Adviser may cancel or revoke the purchase or exchange on the following business day. BNYM Investment Adviser may also temporarily or permanently bar such investor's future purchases into the fund in lieu of, or in addition to, canceling or revoking the

trade. At its discretion, BNYM Investment Adviser may apply these restrictions across all accounts under common ownership, control or perceived affiliation.

Fund shares often are held through omnibus accounts maintained by financial intermediaries, such as brokers and Retirement Plan administrators, where the holdings of multiple shareholders, such as all the clients of a particular broker, are aggregated. BNYM Investment Adviser's ability to monitor the trading activity of investors whose shares are held in omnibus accounts is limited. However, the agreements between the distributor and financial intermediaries include obligations to comply with the terms of this prospectus and to provide BNYM Investment Adviser, upon request, with information concerning the trading activity of investors whose shares are held in omnibus accounts. If BNYM Investment Adviser determines that any such investor has engaged in frequent trading of fund shares, BNYM Investment Adviser may require the financial intermediary to restrict or prohibit future purchases or exchanges of fund shares by that investor.

Certain Retirement Plans and intermediaries that maintain omnibus accounts with the fund may have developed policies designed to control frequent trading that may differ from the fund's policy. At its sole discretion, the fund may permit such intermediaries to apply their own frequent trading policy. If you are investing in fund shares through a financial intermediary (or in the case of a Retirement Plan, your plan sponsor), please contact the financial intermediary for information on the frequent trading policies applicable to your account. To the extent the fund significantly invests in foreign securities traded on markets that close before the fund calculates its NAV, events that influence the value of these foreign securities may occur after the close of the foreign markets and before the fund calculates its NAV. As a result, certain investors may seek to trade fund shares in an effort to benefit from their understanding of the value of the foreign securities at the time the fund calculates its NAV (referred to as price arbitrage). This type of frequent trading may dilute the value of fund shares held by other shareholders. The fund has adopted procedures designed to adjust closing market prices of foreign equity securities under certain circumstances to reflect what it believes to be their fair value.

To the extent the fund significantly invests in thinly traded securities, certain investors may seek to trade fund shares in an effort to benefit from their understanding of the value of these securities (referred to as price arbitrage). Any such frequent trading strategies may interfere with efficient management of the fund's portfolio to a greater degree than funds that invest in highly liquid securities, in part because the fund may have difficulty selling these portfolio securities at advantageous times or prices to satisfy large and/or frequent redemption requests. Any successful price arbitrage may also cause dilution in the value of fund shares held by other shareholders.

Although the fund's frequent trading and fair valuation policies and procedures are designed to discourage market timing and excessive trading, none of these tools alone, nor all of them together, completely eliminates the potential for frequent trading.

If your account falls below $500, the fund may ask you to increase your balance. If it is still below $500 after 45 days, the fund may close your account and send you the proceeds.

If your account is deemed "abandoned" or "unclaimed" under state law, the fund may be required to "escheat" or transfer the assets in your account to the applicable state's unclaimed property administration. The state may sell escheated shares and, if you subsequently seek to reclaim your proceeds of liquidation from the state, you may only be able to recover the amount received when the shares were sold. It is your responsibility to ensure that you maintain a correct address for your account, keep your account active by contacting the fund's transfer agent or distributor by mail or telephone or accessing your account through the fund's website at least once a year, and promptly cash all checks for dividends, capital gains and redemptions. The fund, the fund's transfer agent and BNYM Investment Adviser and its affiliates will not be liable to shareholders or their representatives for good faith compliance with state escheatment laws.

Each share class will generate a different dividend because each has different expenses. The fund earns dividends, interest and other income from its investments, and distributes this income (less expenses) to shareholders as dividends. The fund also realizes capital gains from its investments, and distributes these gains (less any losses) to shareholders as capital gain distributions. The fund normally pays dividends and capital gain distributions, if any, annually. Fund dividends and capital gain distributions will be reinvested in the fund unless you or your financial intermediary instruct the fund otherwise. There are no fees or sales charges imposed by the fund on reinvestments.

Distributions paid by the fund are subject to federal income tax, and also may be subject to state or local tax (unless you are investing through an IRA, Retirement Plan or other U.S. tax-advantaged investment plan). For federal tax purposes,

in general, certain fund distributions, including distributions of short-term capital gains, are taxable as ordinary income. Other fund distributions, including dividends from certain U.S. companies and certain foreign companies and distributions of long-term capital gains, generally are taxable as qualified dividends and capital gains, respectively.

For BNY Mellon International Stock Index Fund, the fund's investments in foreign securities may be subject to foreign withholding or other foreign taxes, which would decrease the fund's return on such securities. Under certain circumstances, shareholders may be entitled to claim a credit or deduction with respect to foreign taxes paid by the fund. In addition, investments in foreign securities or foreign currencies may increase or accelerate the fund's recognition of ordinary income and may affect the timing or amount of the fund's distributions.

High portfolio turnover and more volatile markets can result in significant taxable distributions to shareholders, regardless of whether their shares have increased in value. The fund’s share price may, at any time, reflect undistributed capital gains or income and unrealized appreciation, which may result in future taxable distributions. For example, if the fund has unrealized capital gains, these gains could become taxable to shareholders if the fund sells some appreciated positions during the year. Such distributions can occur even in a year when the fund has a negative return. The tax status of any distribution generally is the same regardless of how long you have been in the fund and whether you reinvest your distributions or take them in cash.

If you buy shares of the fund when the fund has realized but not yet distributed income or capital gains, you will be "buying a dividend" by paying the full price for the shares and then receiving a portion back in the form of a taxable distribution.

Your sale of shares, including exchanges into other funds, may result in a capital gain or loss for tax purposes. A capital gain or loss on your investment in the fund generally is the difference between the cost of your shares and the amount you receive when you sell them.

The tax status of your distributions will be detailed in your annual tax statement from the fund. Because everyone's tax situation is unique, please consult your tax adviser before investing.

Annual year-end distribution estimates, if any, are expected to be available beginning in early October, and may be updated from time to time, at http://im.bnymellon.com/taxcenter or by calling 1-800-373-9387 (inside the U.S. only) or your financial representative.

The following services may be available to fund investors. If you purchase shares through a third party financial intermediary or in a Retirement Plan, the financial intermediary or Retirement Plan recordkeeper may impose different restrictions on these services and privileges, or may not make them available at all. Consult a representative of your financial intermediary or Retirement Plan for further information.

Buying or selling shares automatically is easy with the services described below. With each service, you select a schedule and amount, subject to certain restrictions. For information, call 1-800-373-9387 (inside the U.S. only) or your financial representative.

Automatic Asset Builder permits you to purchase fund shares (minimum of $100 and maximum of $150,000 per transaction) at regular intervals selected by you. Fund shares are purchased by transferring funds from the bank account designated by you.

Payroll Savings Plan permits you to purchase fund shares (minimum of $100 per transaction) automatically through a payroll deduction.

Government Direct Deposit permits you to purchase fund shares (minimum of $100 and maximum of $50,000 per transaction) automatically from your federal employment, Social Security or other regular federal government check.

Dividend Sweep permits you to automatically reinvest dividends and distributions from the fund in shares of the same class, or another class in which you are eligible to invest, of another fund in the BNY Mellon Family of Funds. However, if you hold fund shares through financial intermediary brokerage platforms, you may invest automatically your dividends and distributions from the fund only in shares of the same class of another fund in the BNY Mellon Family of Funds. Shares held through a Coverdell Education Savings Account sponsored by BNYM Investment Adviser or its affiliates are not eligible for this privilege.

Auto-Exchange Privilege permits you to exchange at regular intervals your fund shares for shares of the same class, or another class in which you are eligible to invest, of another fund in the BNY Mellon Family of Funds. However, if you

hold fund shares through financial intermediary brokerage platforms, you may only exchange fund shares for shares of the same class of another fund in the BNY Mellon Family of Funds.

Automatic Withdrawal Plan permits you to make withdrawals (minimum of $50) on a specific day each month, quarter or semi-annual or annual period, provided your account balance is at least $5,000.

Generally, you can exchange shares worth $500 or more (no minimum for Retirement Plans and IRAs sponsored by BNYM Investment Adviser or its affiliates) into shares of the same class, or another class in which you are eligible to invest, of another fund in the BNY Mellon Family of Funds. However, if you hold fund shares through financial intermediary brokerage platforms, you may only exchange fund shares for shares of the same class of another fund in the BNY Mellon Family of Funds. You can request your exchange by calling 1-800-373-9387 (inside the U.S. only) or your financial representative. If you are an Institutional Direct accountholder, please contact your BNY Mellon relationship manager for instructions. Be sure to read the current prospectus for any fund into which you are exchanging before investing. Any new account established through an exchange generally will have the same privileges as your original account (as long as they are available). There is currently no fee for exchanges, although you may be charged a sales load when exchanging into any fund that has one.

Your exchange request will be processed on the same business day it is received in proper form, provided that each fund is open at the time of the request (i.e., the request is received by the latest time each fund calculates its NAV for that business day). If the exchange is accepted at a time of day after one or both of the funds is closed (i.e., at a time after the NAV for the fund has been calculated for that business day), the exchange will be processed on the next business day. See the SAI for more information regarding exchanges.

Shares of one class of a fund, as applicable, may be converted into shares of another class of the fund, provided you meet the eligibility requirements for investing in the new share class. The fund reserves the right to refuse any conversion request.

To redeem shares from your fund account with a phone call (for regular or IRA accounts) or online (for regular accounts only), use the Wire Redemption Privilege or the TeleTransfer Privilege. To purchase additional shares in your fund account with a phone call (for regular or IRA accounts) or online (for regular accounts only), use the TeleTransfer Privilege. You can set up the Wire Redemption Privilege and TeleTransfer Privilege on your account by providing bank account information and following the instructions on your application or, if your account has already been established, a Shareholder Services Form which you can obtain by calling 1-800-373-9387 (inside the U.S. only), visiting www.im.bnymellon.com or contacting your financial representative. Shares held in a Coverdell Education Savings Account may not be redeemed through the Wire Redemption or TeleTransfer Privileges. Institutional Direct accounts are not eligible for the Wire Redemption or TeleTransfer Privileges initiated online.

Every investor in a fund in the BNY Mellon Family of Funds automatically receives regular account statements. You will also be sent a yearly statement detailing the tax characteristics of any dividends and distributions you have received.

You can check your account balances, get fund price and performance information, order documents and much more, by calling 1-800-373-9387 (inside the U.S. only) and using the Express voice-activated account access system. You may also be able to purchase fund shares and/or transfer money between your funds in the BNY Mellon Family of Funds using the Express voice-activated account access system. Certain requests require the services of a representative.

These financial highlights describe the performance of the fund's shares for the fiscal periods indicated. "Total return" shows how much your investment in the fund would have increased (or decreased) during each period, assuming you had reinvested all dividends and distributions. These financial highlights have been derived from the fund's financial statements, which have been audited by Ernst & Young LLP, an independent registered public accounting firm, whose report, along with the fund's financial statements, is included in the annual report, which is available upon request.

BNY Mellon S&P 500 Index Fund, a series of BNY Mellon Index Funds, Inc.
BNY Mellon Midcap Index Fund, Inc.
BNY Mellon Smallcap Stock Index Fund, a series of BNY Mellon Index Funds, Inc.
BNY Mellon International Stock Index Fund, a series of BNY Mellon Index Funds, Inc.

More information on this fund is available free upon request, including the following:

The fund's annual and semi-annual reports describe the fund's performance, list portfolio holdings and contain a letter from the fund's manager discussing recent market conditions, economic trends and fund strategies that significantly affected the fund's performance during the period covered by the report. The fund's most recent annual and semi-annual reports are available at www.im.bnymellon.com.

The SAI provides more details about the fund and its policies. A current SAI is available at www.im.bnymellon.com and is on file with the Securities and Exchange Commission (SEC). The SAI, as amended or supplemented from time to time, is incorporated by reference (and is legally considered part of this prospectus).

The fund generally discloses, at www.im.bnymellon.com, (1) complete portfolio holdings as of each calendar quarter end with a 15-day lag and as of each month-end with a one-month lag; (2) top 10 holdings as of each month-end with a 10-day lag; and (3) from time to time, certain security-specific performance attribution data as of a month-end, with a 10-day lag. From time to time, the fund may make available certain portfolio characteristics, such as allocations, performance- and risk-related statistics, portfolio-level statistics and non-security specific attribution analyses, on request. The fund's portfolio holdings will remain on the website for a period of six months and any security-specific performance attribution data will remain on the website for varying periods up to six months, provided that portfolio holdings will remain until the fund files its Form N-PORT or Form N-CSR for the period that includes the dates of the posted holdings.

A complete description of the fund's policies and procedures with respect to the disclosure of the fund's portfolio securities is available in the fund's SAI and at www.im.bnymellon.com.

By mail.
The BNY Mellon Family of Funds
144 Glenn Curtiss Boulevard
Uniondale, NY 11556-0144

On the Internet. Certain fund documents can be viewed online or downloaded from:

This prospectus does not constitute an offer or solicitation in any state or jurisdiction in which, or to any person to whom, such offering or solicitation may not lawfully be made.

SEC file number: BNY Mellon Index Funds, Inc.: 811-05883 BNY Mellon Midcap Index Fund, Inc.: 811-06325


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Management fees	.25
Other expenses:
Shareholder services fees	.25
Miscellaneous other expenses	.01
Total other expenses	.26
Total annual fund operating expenses	.51
Fee waiver^*	(.01)
Total annual fund operating expenses (after fee waiver)	.50


1 Year	3 Years	5 Years	10 Years
$51	$160	$280	$628


Average Annual Total Returns (as of 12/31/23)
	1 Year	5 Years	10 Years
Fund returns before taxes	25.68%	15.11%	11.48%
Fund returns after taxes on distributions	23.63%	12.24%	8.86%
Fund returns after taxes on distributions and sale of fund shares	16.66%	11.76%	8.78%
S&P 500^{^®} Index reflects no deductions for fees, expenses or taxes	26.27%	15.68%	12.02%


	1 Year	3 Years	5 Years	10 Years
Investor Shares	$51	$160	$280	$628
Class I Shares	$26	$80	$141	$318


	1 Year	3 Years	5 Years	10 Years
Investor Shares	$51	$160	$280	$628
Class I Shares	$26	$80	$141	$318


Funds	Ticker Symbols
BNY Mellon S&P 500 Index Fund	PEOPX
BNY Mellon Midcap Index Fund, Inc.
Investor Shares	PESPX
Class I Shares	DMIDX
BNY Mellon Smallcap Stock Index Fund
Investor Shares	DISSX
Class I Shares	DISIX
BNY Mellon International Stock Index Fund
Investor Shares	DIISX
Class I Shares	DINIX


BNY Mellon S&P 500 Index Fund	1
BNY Mellon Midcap Index Fund	4
BNY Mellon Smallcap Stock Index Fund	8
BNY Mellon International Stock Index Fund	12


Choosing a Share Class	22
Buying and Selling Shares	23
General Policies	26
Distributions and Taxes	27
Services for Fund Investors	28


Year-by-Year Total Returns as of 12/31 each year (%)

	During the periods shown in the chart: Best Quarter Q2, 2020: 20.40% Worst Quarter Q1, 2020: -19.74%


	Year Ended October 31,
BNY Mellon S&P 500 Index Fund	2023	2022	2021	2020	2019
Per Share Data ($):
Net asset value, beginning of period	49.07	65.31	51.48	53.93	55.44
Investment Operations:
Net investment income^a	.57	.56	.56	.71	.79
Net realized and unrealized gain (loss) on investments	3.59	(9.08)	19.58	4.07	5.03
Total from Investment Operations	4.16	(8.52)	20.14	4.78	5.82
Distributions:
Dividends from net investment income	(.62)	(.58)	(.75)	(.85)	(.84)
Dividends from net realized gain on investments	(4.52)	(7.14)	(5.56)	(6.38)	(6.49)
Total Distributions	(5.14)	(7.72)	(6.31)	(7.23)	(7.33)
Net asset value, end of period	48.09	49.07	65.31	51.48	53.93
Total Return (%)	9.60	(15.03)	42.21	9.13	13.76
Ratios/Supplemental Data (%):
Ratio of total expenses to average net assets	.51	.51	.51	.51	.51
Ratio of net expenses to average net assets	.50	.50	.50	.50	.50
Ratio of net investment income to average net assets	1.19	1.03	.95	1.41	1.55
Portfolio Turnover Rate	1.98	1.89	3.31	2.43	2.81
Net Assets, end of period ($ x 1,000)	1,938,020	1,919,564	2,553,501	2,078,988	2,272,556


	1 Year	3 Years	5 Years	10 Years
Investor Shares	$61	$192	$335	$750
Class I Shares	$36	$113	$197	$443