497 1 c497.htm SUPPLEMENT TO PROSPECTUS 497(C)

Dreyfus Treasury Securities Cash Management

Prospectus | May 30, 2025

Token-Enabled Shares (TKNXX)


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.

Contents

Fund Summary


Fund Summary	1

Fund Details


Goal and Approach	4
Investment Risks	4
Management	5

Shareholder Guide


Buying and Selling Shares	7
General Policies	9
Distributions and Taxes	9
Services for Fund Investors	10

Financial Highlights


Financial Highlights	11

For More Information

See back cover.

Fund Summary

Investment Objective

The fund seeks as high a level of current income as is consistent with the preservation of capital and the maintenance of liquidity.

Fees and Expenses

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.


Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
	Token-Enabled Shares
Management fees	.20
Other expenses	.01
Total annual fund operating expenses	.21
Fee waiver^*	(.03)
Total annual fund operating expenses (after fee waiver)	.18

^* The fund's investment adviser, BNY Mellon Investment Adviser, Inc., has contractually agreed, until May 30, 2026 to waive receipt of a portion of its management fee in the amount of .03% of the value of the fund's average daily net assets. On or after May 30, 2026, BNY Mellon Investment Adviser, Inc. may terminate this waiver agreement at any time.

Example

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 one-year example and the first year of the three-, five- and ten-years 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:


	1 Year	3 Years	5 Years	10 Years
Token-Enabled Shares	$18	$65	$115	$265

Principal Investment Strategy

The fund pursues its investment objective by investing only in U.S. Treasury securities, including those with floating or variable rates of interest, and cash. The fund is a money market fund subject to the maturity, quality, liquidity and diversification requirements of Rule 2a-7 under the Investment Company Act of 1940, as amended, and seeks to maintain a stable share price of $1.00.

The fund is a "government money market fund," as that term is defined in Rule 2a-7, and as such is required to invest at least 99.5% of its total assets in securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities, repurchase agreements collateralized solely by cash and/or government securities, and cash. The fund typically invests exclusively in U.S. Treasury securities.

By investing exclusively in U.S. Treasury securities, income paid by the fund generally will be exempt from state and local taxes. Because rules regarding the state and local taxation of dividend income can differ from state to state, investors are urged to consult their tax advisers about the taxation of the fund's dividend income in their state and locality.

Principal Risks

An investment in the fund is not a bank account or a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund's yield will fluctuate as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in securities with different interest rates. BNY Mellon Investment Adviser, Inc. and its affiliates are not required to reimburse the fund for losses, and you should not expect that BNY Mellon Investment Adviser, Inc. or its affiliates will provide financial support to the fund at any time, including during periods of market stress. The following are the principal risks that could reduce the fund's income level and/or share price:

· Interest rate risk: This risk refers to the decline in the prices of fixed-income securities that may accompany a rise in the overall level of interest rates. A sharp and unexpected rise in interest rates could impair the fund's ability to maintain a stable net asset value. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation and changes in general economic conditions. It is difficult to predict the pace at which central banks or monetary authorities may increase (or decrease) interest rates or the timing, frequency, or magnitude of such changes. Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility and may detract from fund performance. For floating and variable rate obligations, there may be a lag between an actual change in the underlying interest rate benchmark and the reset time for an interest payment of such an obligation, which could harm or benefit the fund, depending on the interest rate environment or other circumstances.

· Market risk: The value of the securities in which the fund invests may be affected by political, regulatory, economic and social developments. Events such as war, acts of terrorism, the spread of infectious illness or other public health issue, recessions, or other events could have a significant impact on the fund and its investments. Recent examples include pandemic risks related to COVID-19 and aggressive measures taken world-wide in response by governments, including closing borders, restricting international and domestic travel, and the imposition of prolonged quarantines of large populations, and by businesses, including changes to operations and reducing staff.

Performance

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 Institutional shares from year to year. The table shows the average annual total returns of the fund's Institutional shares over time. The fund's past performance is not necessarily an indication of how the fund will perform in the future. More recent performance information may be available at www.dreyfus.com.

The historical performance of the fund's Institutional shares, which are not offered in this prospectus, is shown in the bar chart and table since Token-Enabled shares are new and past performance information is not available for Token-Enabled shares as of the date of this prospectus. 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. Accordingly, although Token-Enabled shares are estimated to have a comparable total annual expense ratio to that of Institutional shares, to the extent Token-Enabled shares were to have a higher total annual expense ratio than Institutional shares, the performance shown for Token-Enabled shares would be lower.

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


	During the periods shown in the chart: Best Quarter 2023, Q4: 1.33 Worst Quarter 2021, Q4: 0.00

The year-to-date total return of the fund's Institutional shares as of March 31, 2025 was 1.05%


Average Annual Total Returns as of 12/31/24^*
	1 Year	5 Years	10 Years
Institutional Shares	5.14%	2.35%	1.63%

For the current yield for Institutional shares, call toll-free 1-800-373-9387 (inside the U.S. only). Individuals or entities for whom institutions may purchase or redeem shares should call the institution directly.

^*Reflects the performance of the fund's Institutional shares, which are offered in a separate prospectus.

Portfolio Management

The fund's investment adviser is BNY Mellon Investment Adviser, Inc. (BNYIA). BNYIA has engaged its affiliate, Dreyfus, a division of Mellon Investments Corporation, to serve as the fund's sub-adviser.

Purchase and Sale of Fund Shares

This prospectus offers Token-Enabled shares.

The fund's Token-Enabled shares are designed generally for institutional investors, acting for themselves or in a fiduciary, advisory, agency, brokerage, custodial or similar capacity. Token-Enabled shares of the fund also may be purchased directly by individuals. Investors are required to purchase Token-Enabled shares through The Bank of New York Mellon, an affiliate of BNYIA, on The Bank of New York Mellon's platform. For information on how to purchase Token-Enabled shares, please contact your BNY representative. In general, the fund's minimum initial investment for Token-Enabled shares is $10 million with no minimum subsequent investment, unless: (a) the investor has invested at least $10 million in the aggregate among the fund and any of the Cash Management Funds, the Preferred Funds or Dreyfus Treasury and Agency Liquidity Money Market Fund; or (b) the investor has, in the opinion of BNY Institutional Services, adequate intent and availability of assets to reach a future aggregate level of investment of $10 million in such funds. You may sell (redeem) your shares on any business day by contacting your BNY representative.

The fund's transfer agent maintains the official books and records of ownership of Token-Enabled shares, with such ownership reflected as an omnibus account for The Bank of New York Mellon (The Bank of New York Mellon Omnibus Account). The Bank of New York Mellon will maintain the share ownership records of its clients using its traditional books and records methods, and also will mirror such share ownership via a blockchain system. Assets are represented on the blockchain through "tokens," which are a digital representation of an asset and are built into the blockchain. Clients of The Bank of New York Mellon will not have access to ownership records, and will not be able to transact, directly on the blockchain.

Tax Information

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

Payments to Broker-Dealers and Other Financial Intermediaries

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.

Fund Details

Goal and Approach

The fund seeks as high a level of current income as is consistent with the preservation of capital and the maintenance of liquidity. The fund pursues its investment objective by investing only in U.S. Treasury securities, including those with floating or variable rates of interest, and cash.

The fund is a money market fund, subject to the maturity, quality, liquidity and diversification requirements of Rule 2a-7 under the Investment Company Act of 1940, as amended.

The fund seeks to maintain a stable share price of $1.00. The fund is a "government money market fund," as that term is defined in Rule 2a-7, and as such is required to invest at least 99.5% of its total assets in securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities, repurchase agreements collateralized solely by cash and/or government securities, and cash.

The fund typically invests exclusively in U.S. Treasury securities. By investing exclusively in U.S. Treasury securities, income paid by the fund generally will be exempt from state and local taxes. Because rules regarding the state and local taxation of dividend income can differ from state to state, investors are urged to consult their tax advisers about the taxation of the fund's dividend income in their state and locality. The fund will provide shareholders with at least 60 days' prior notice of any changes to its policy to invest, under normal conditions, exclusively in U.S. Treasury securities.

Among other requirements, the fund is required to hold at least 50% of its assets in cash, U.S. Treasury securities, certain other government securities with remaining maturities of 60 days or less, or securities that can readily be converted into cash within five business days. In addition, the fund is required to hold at least 25% of its assets in cash, U.S. Treasury securities or securities that can readily be converted into cash within one business day. The fund must maintain an average dollar-weighted portfolio maturity of 60 days or less and a maximum weighted average life to maturity of 120 days.

As part of this assessment, to the extent relevant information is available, Dreyfus also evaluates whether environmental, social and governance (ESG) factors could have a positive, negative or neutral impact on the entity's credit risk profile. In evaluating ESG factors, Dreyfus considers ESG research developed by one or more of its affiliates or third parties, including ESG assessments and commentary provided by credit rating agencies, and other material ESG information as available. ESG data provided by affiliated and unaffiliated data providers may lack standardization, consistency and transparency, may be limited and/or subjective and may not be available, complete or accurate. Based on its evaluation of ESG factors, Dreyfus may adjust the applicable credit or maturity limits for the relevant issuer, guarantor or counterparty. Dreyfus, however, may determine, across all investments within the fund, that other attributes of creditworthiness, such as sources of liquidity and market positioning, outweigh ESG considerations when making an investment decision, and may not consider available ESG data in connection with every investment decision it makes on behalf of the fund.

In response to liquidity needs or unusual market conditions, the fund may hold all or a significant portion of its total assets in cash for temporary defensive purposes. This may result in a lower current yield and prevent the fund from achieving its investment objective.

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

Investment Risks

An investment in the fund is not a bank account or a bank deposit. It is not insured or guaranteed by the FDIC or any other government agency. You could lose money by investing in the fund. Although the fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. The fund's yield will fluctuate as the short-term securities in its portfolio mature or are sold and the proceeds are reinvested in securities with different interest rates. BNYIA and its affiliates are not required to reimburse the fund for losses, and you should not expect that BNYIA or its affiliates will provide financial support to the fund at any time, including during periods of market stress. The following are the principal risks that could reduce the fund's income level and/or share price:

· Interest rate risk: Prices of fixed-income securities tend to move inversely with changes in interest rates. Interest rate risk refers to the decline in the prices of fixed-income securities that may accompany a rise in the overall level of interest rates. A sharp and unexpected rise in interest rates could impair the fund's ability to maintain a stable net asset value. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation and changes in general economic conditions. It is difficult to predict the pace at which central banks or monetary authorities may increase (or decrease) interest rates or the timing, frequency, or magnitude of such changes. A low interest rate environment may prevent the fund from providing a positive yield or paying fund expenses out of fund assets and impair the fund's ability to maintain a stable net asset value. Changing interest rates may have unpredictable effects on markets, may result in heightened market volatility and may detract from fund performance. In such an interest rate environment, the fund may be subject to a greater risk of principal decline from rising interest rates. For floating and variable rate obligations, there may be a lag between an actual change in the underlying interest rate benchmark and the reset time for an interest payment of such an obligation, which could harm or benefit the fund, depending on the interest rate environment or other circumstances. In a rising interest rate environment, for example, a floating or variable rate obligation that does not reset immediately would prevent the fund from taking full advantage of the rising interest rates in a timely manner. However, in a declining interest rate environment, the fund may benefit from a lag due to an obligation's interest rate payment not being immediately impacted by a decline in interest rates.

· 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 may fall dramatically, potentially impairing the fund's ability to maintain a stable net asset value. To meet redemption requests, the fund may be forced to sell securities at an unfavorable time and/or under unfavorable conditions, which may impair the fund's ability to maintain a stable net asset value.

· U.S. Treasury securities risk: A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of interest and principal when held to maturity, but the market prices for such securities are not guaranteed and will fluctuate. In addition, such guarantees do not extend to shares of the fund itself. Because U.S. Treasury securities trade actively outside the United States, their prices may rise and fall as changes in global economic conditions affect the demand for these securities.

Management

Investment Adviser

The fund's investment adviser is BNY Mellon Investment Adviser, Inc., 240 Greenwich Street, New York, New York 10286. BNYIA manages approximately $352 billion in 89 mutual fund portfolios. For the fiscal year ended January 31, 2025, the fund paid BNYIA a management fee at the effective annual rate set forth in the table below. The fund paid BNYIA an effective management fee at a lower rate due to an undertaking by BNYIA to waive fees and/or reimburse fund expenses during the period.


Name of Fund	Effective Management Fee (as a percentage of average daily net assets)
Dreyfus Treasury Securities Cash Management	.17

A discussion regarding the basis for the board's approving the fund's management agreement with BNYIA is available in the fund's Form N-CSR for the six-month period ended July 31, 2024.BNYIA is the primary mutual fund business of The Bank of New York Mellon Corporation (BNY), 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 delivers informed investment management and investment services in 35 countries. BNY 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 has $53.1 trillion in assets under custody and administration and $2.0 trillion in assets under management. BNY is the corporate brand of The Bank of New York Mellon Corporation and may be used to reference the corporation as a whole and/or its various

subsidiaries generally. BNY Investments is one of the world's leading investment management organizations, and one of the top U.S. wealth managers, encompassing BNY's affiliated investment management firms, wealth management services and global distribution companies. Additional information is available at www.bny.com/investments.

The asset management philosophy of BNYIA is based on the belief that discipline and consistency are important to investment success. For each fund, BNYIA 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.

Sub-Adviser

BNYIA has engaged its affiliate, Dreyfus, to serve as the fund's sub-adviser, pursuant to a sub-investment advisory agreement between BNYIA and Dreyfus. Dreyfus, subject to BNYIA's supervision and approval, provides investment advisory assistance and research and the day-to-day management of the fund's assets. Dreyfus is a division of Mellon Investments Corporation (MIC), a registered investment adviser and an indirect wholly-owned subsidiary of BNY, with its principal office located at 500 Ross Street, Pittsburgh, PA 15258. As of March 31, 2025, MIC had approximately $901.6 billion of assets under management, which includes approximately $408.2 billion in assets managed by investment personnel of MIC acting in their capacity as officers of the Dreyfus division of MIC.

A discussion regarding the basis for the board's approving the sub-investment advisory agreement between BNYIA and Dreyfus is available in the fund's Form N-CSR for the six-month period ended July 31, 2024.

Distributor

BNY Mellon Securities Corporation (BNYSC), a wholly-owned subsidiary of BNYIA, serves as distributor of the fund and of the other funds in the BNY Mellon Family of Funds. BNYIA or BNYSC 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 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 BNYIA's or BNYSC'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, BNYIA or BNYSC 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 fund, BNYIA, Dreyfus and BNYSC 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.

Shareholder Guide

Buying and Selling Shares

This prospectus offers Token-Enabled shares. The fund's Token-Enabled shares are designed generally for institutional investors, acting for themselves or in a fiduciary, advisory, agency, brokerage, custodial or similar capacity. Token-Enabled shares of the fund also may be purchased directly by individuals. Generally, each investor will be required to open a single master account with the fund for all purposes. In certain cases, the fund may request investors to maintain separate master accounts for shares held by the investor (i) for its own account, for the account of other institutions and for accounts for which the institution acts as a fiduciary, and (ii) for accounts for which the investor acts in some other capacity. An institution may arrange with the fund's transfer agent for sub-accounting services and will be charged directly for the cost of such services. Institutions purchasing Token-Enabled shares for the benefit of their clients may impose policies, limitations and fees which are different from those described in this prospectus. The fund offers other classes of shares, which are described in separate prospectuses. Institutions purchasing fund shares on behalf of their clients determine which class of shares is suitable for their clients.

For information on how to purchase or redeem Token-Enabled shares, please contact your BNY representative.

Investors are required to purchase Token-Enabled shares through The Bank of New York Mellon, an affiliate of BNYIA, on The Bank of New York Mellon's platform. The fund's transfer agent maintains the official books and records of ownership of Token-Enabled shares, with such ownership reflected as an omnibus account for The Bank of New York Mellon (The Bank of New York Mellon Omnibus Account). The Bank of New York Mellon will maintain the share ownership records of its clients using its traditional books and records methods, and also will mirror such share ownership via a blockchain system. A "blockchain" is a type of digital database or ledger that facilitates the process of recording transactions and tracking assets in a business network. Unlike the currently implemented traditional books and records maintained by fund transfer agents, including the fund's transfer agent, a blockchain is a system that allows for the sharing of information across its network. Assets are represented on the blockchain through "tokens," which are a digital representation of an asset and are built into the blockchain.

The Bank of New York Mellon will mirror the ownership of its clients' Token-Enabled shares on a blockchain implemented by a financial institution (Blockchain). The Blockchain is a private, permissioned blockchain. Only authorized users, such as The Bank of New York Mellon, will have access to the Blockchain. In its capacity as platform operator, the financial institution will operate the Blockchain as a technical platform provider. The Bank of New York Mellon, and not the fund or the fund's transfer agent, will be responsible for its clients' ownership records on the Blockchain. Clients of The Bank of New York Mellon will not have access to ownership records, and will not be able to transact, directly on the Blockchain. The fund and the fund's transfer agent will only be responsible for maintaining share ownership of Token-Enabled shares represented on its books and records through The Bank of New York Mellon Omnibus Account. The fund will not bear any costs associated with the use of the Blockchain.

The recording of the ownership of Token-Enabled shares of the fund by The Bank of New York Mellon on the Blockchain will not affect the fund's investments. The fund is a "government money market fund," as that term is defined in Rule 2a-7, and as such is required to invest at least 99.5% of its total assets in securities issued or guaranteed as to principal and interest by the U.S. government or its agencies or instrumentalities, repurchase agreements collateralized solely by cash and/or government securities, and cash. The fund typically invests exclusively in U.S. Treasury securities. The fund will not invest in any cryptocurrencies (referred to as, among other things, virtual currencies).

Your price for Token-Enabled shares is the net asset value (NAV) per share. You pay no sales charge to invest in shares of the fund.

The fund's portfolio securities are valued at amortized cost, which does not take into account unrealized gains or losses. As a result, portfolio securities are valued at their acquisition cost, adjusted over time based on the discounts or premiums reflected in their purchase price.

The fund uses this valuation method pursuant to Rule 2a-7 under the Investment Company Act of 1940, as amended, in order to be able to maintain a price of $1.00 per share. The fund may continue to use the amortized cost method of valuation only so long as the fund's board believes that it fairly reflects the market-based NAV per share.

At least daily, the fund compares the NAV using amortized cost to its NAV using available market quotations or market equivalents, which generally are provided 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.

The fund's NAV is calculated on any day the New York Stock Exchange (NYSE) is open. In addition, the fund's NAV will be calculated on any day the NYSE is closed but the Federal Reserve Bank is open and the Securities Industry and Financial Markets Association (SIFMA) recommends that fixed income securities markets be open for the day or a portion of the day.

The fund's NAV is generally calculated every hour on the hour from 8:00 a.m. to 3:00 p.m., Eastern time, each day the fund accepts purchase orders and redemption requests (each such time, the trading deadline for orders "in proper form" (as defined below)). In its discretion, a fund's board may elect to calculate the fund's NAV once per day.

In the case of an emergency, if regular trading on the NYSE is restricted or the NYSE closes early, the fixed income securities markets or the Federal Reserve Bank closes early, or as otherwise permitted by the Securities and Exchange Commission, the fund may elect to close early. If the fund closes early on a business day, then the fund will calculate its last NAV as of the time of such closing and the fund must receive purchase orders and redemption requests prior to such closing time.

How to Buy Shares

Orders in proper form received and accepted by the fund or a financial intermediary that serves as agent for the fund will become effective at the NAV next determined after it is received by the fund or a financial intermediary, and the shares purchased will receive the dividend declared on that day provided the shares are not redeemed prior to the last NAV determined that day. An order to purchase shares received by the fund will be deemed to be "in proper form" if the fund receives "federal funds" or other immediately available funds promptly thereafter. Unless other arrangements have been agreed to in advance, the fund generally expects to receive the funds within two hours after the order is received by the fund or a financial intermediary that serves as agent for the fund, or by 6:00 p.m., Eastern time, whichever is earlier. Orders submitted through a financial intermediary that does not serve as an agent for the fund are priced at the fund's NAV next calculated after the fund receives the order in proper form from the intermediary and accepts it, which may not occur on the day the order is submitted to the intermediary.

An order in proper form received and accepted after the time of day at which the fund determines its last NAV will be priced at the first NAV determined on the following business day and will begin to accrue dividends on such business day. If payment is not received within the appropriate time period, the fund reserves the right to cancel the purchase order at its discretion, and the investor would be liable for any resulting losses or expenses incurred by the fund or the fund's transfer agent, including interest charges.

The minimum initial investment in Token-Enabled shares is $10 million, with no minimum subsequent investment, unless: (a) the investor has invested at least $10 million in the aggregate among the fund and (i) any of the Cash Management Funds, which currently include Dreyfus Government Cash Management, Dreyfus Government Securities Cash Management, Dreyfus Treasury Obligations Cash Management and Dreyfus Treasury Securities Cash Management; or (ii) any of the Preferred Funds, which currently include Dreyfus Institutional Preferred Government Money Market Fund, Dreyfus Institutional Preferred Treasury Obligations Fund and Dreyfus Institutional Preferred Treasury Securities Money Market Fund or (iii) Dreyfus Treasury and Agency Liquidity Money Market Fund; or (b) the investor has, in the opinion of BNY Institutional Services, adequate intent and availability of assets to reach a future aggregate level of investment of $10 million in such funds.

How to Sell Shares

You may sell (redeem) shares at any time.

Your shares will be priced at the next determined NAV. If a request for redemption is received and accepted by the fund or a financial intermediary that serves as agent for the fund by the time of day at which the fund determines its last NAV, the proceeds of the redemption ordinarily will be transmitted by wire in federal funds on the same day, and the shares will not receive the dividend declared on that day. Under certain circumstances (i.e., during periods of stressed market conditions or in cases of very large redemption requests), however, the fund may pay a portion or all of the redemption proceeds payable by wire on the next business day. If the request is received and accepted after the time of day at which the fund determines its last NAV, or is transmitted through the National Securities Clearing Corporation, the shares will receive the dividend declared on that day, and the proceeds of redemption ordinarily will be transmitted by wire in federal funds on the next business day. Requests for redemption submitted through a financial intermediary that does not serve as an agent for the fund are priced at the fund's NAV next calculated after the fund receives the request from the intermediary and accepts it, which may not occur on the day the order is submitted to the intermediary.

The processing of redemptions may be suspended, and the delivery of redemption proceeds may only be delayed by more than one business day, 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.

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.

The fund also reserves the right to pay redemption proceeds in securities rather than cash (i.e., "redeem in-kind"), if the amount redeemed is large enough to affect fund operations or the redemption request is during stressed market conditions. Investors are urged to call BNY Institutional Services before effecting any large transactions. Securities distributed in connection with any such redemption in-kind are expected to generally represent the investor's 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, restricted securities, odd lots or fractional shares. Any securities distributed in-kind will remain exposed to market risk until sold, and you may incur taxable gain when selling the securities.

General Policies

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.

Money market funds generally are used by investors for short-term investments, often in place of bank checking or savings accounts, or for cash management purposes. Investors value the ability to add and withdraw their funds quickly, without restriction. For this reason, although BNYIA discourages excessive trading and other abusive trading practices, the fund has not adopted policies and procedures, or imposed redemption fees or other restrictions such as minimum holding periods, to deter frequent purchases and redemptions of fund shares. BNYIA also believes that money market funds, such as the fund, are not typically targets of abusive trading practices. However, frequent purchases and redemptions of the fund's shares could increase the fund's transaction costs, such as market spreads and custodial fees, and may interfere with the efficient management of the fund's portfolio, which could detract from the fund's performance. The fund reserves the right to reject any purchase or exchange request in whole or in part. Funds in the BNY Mellon Family of Funds that are not money market mutual funds have approved policies and procedures that are intended to discourage and prevent abusive trading practices in those mutual funds.

The fund also reserves the right to change its minimum investment amount.

The fund also may process purchase and sale orders and calculate its NAV on days that the fund's primary trading markets are open and the fund's management determines to do so.

Escheatment

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 BNYIA and its affiliates will not be liable to shareholders or their representatives for good faith compliance with state escheatment laws.

Distributions and Taxes

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 ordinarily declares dividends from its net investment income on each day its NAV is calculated and normally pays dividends monthly and capital gain distributions, if any, annually. Fund dividends and capital gain distributions will be reinvested in the fund unless you instruct the fund otherwise. There are no fees or sales charges imposed by the fund on reinvestments.

The fund's distributions are taxable as ordinary income or capital gains (unless you are investing through a U.S. tax-advantaged investment plan, in which case taxes may be deferred).

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.

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.

Services for Fund Investors

Account Statements

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

Financial Highlights

These financial highlights describe the performance of the fund's Institutional 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 fund's Form N-CSR, which is available upon request. As Token-Enabled shares are a new class of the fund, financial highlights information is not available for Token-Enabled shares as of the date of this prospectus.


Dreyfus Treasury Securities Cash Management	Year Ended January 31,
Institutional Shares	2025	2024	2023	2022	2021
Per Share Data ($):
Net asset value, beginning of period	1.00	1.00	1.00	1.00	1.00
Investment Operations:
Net investment income	.050	.049	.018	.000^a	.002
Distributions:
Dividends from net investment income	(.050)	(.049)	(.018)	(.000)^a	(.002)
Net asset value, end of period	1.00	1.00	1.00	1.00	1.00
Total Return (%)	5.06	5.04	1.77	.01	.24
Ratios/Supplemental Data (%):
Ratio of total expenses to average net assets	.21	.21	.21	.21	.21
Ratio of net expenses to average net assets	.18	.18	.17	.05	.17
Ratio of net investment income to average net assets	4.93	4.97	1.78	.01	.21
Net Assets, end of period ($ x 1,000)	48,895,813	43,641,059	31,570,972	33,717,357	29,170,141

^aAmount represents less than $.001 per share.

NOTES

For More Information

Dreyfus Treasury Securities Cash Management

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

Annual/Semi-Annual Report and Financial Statements

Additional information about the fund's investments is available in the fund's annual and semi-annual reports to shareholders and in Form N-CSR. The fund's Form N-CSR contains the fund's financial statements and lists the fund's portfolio holdings. The fund's most recent annual and semi-annual reports and other information, such as the fund's financial statements, are available at www.dreyfus.com.

Statement of Additional Information (SAI)

The SAI provides more details about the fund and its policies. A current SAI is available at www.dreyfus.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).

Portfolio Holdings

Dreyfus money market funds generally disclose, at www.dreyfus.com, their complete schedule of holdings on each business day, as of the preceding business day. Each Dreyfus money market fund's daily posting of its complete portfolio holdings will remain available on the website for five months. 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, upon request.

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.dreyfus.com.

To Obtain Information

By telephone. Call your BNY Institutional Services representative or 1-800-373-9387 (inside the U.S. only)

By mail. BNY Institutional Services, 144 Glenn Curtiss Boulevard, Uniondale, NY 11556-0144

By E-mail. Send your request to info@bny.com

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

Reports and other information about the fund are available on the EDGAR Database on the SEC's website at http://www.sec.gov, and that copies of this information may be obtained, after paying a duplicating fee, by electronic request at the following email address: publicinfo@sec.gov.

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: 811-05718


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