Untitled Document

497 1 dtscmservicesharesb-pershing.htm BROKER-DEALER 497E Untitled Document

Dreyfus Treasury Securities Cash Management

PROSPECTUS November 16, 2020
As Revised, May 11, 2021
Ticker Symbol: Service Shares (DTHXX)

Contents

Fund Summary


Fund Summary	1

Fund Details


Goal and Approach	5
Investment Risks	5
Management	6

Shareholder Guide


Buying and Selling Shares	8
General Policies	9
Distributions and Taxes	10
Financial Highlights	11

For More Information

See back cover.

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.

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)
	Service Shares
Management fees	.20
Other expenses:
Administrative services fees	.55
Shareholder services fees	.25
Miscellaneous other expenses	.01
Total other expenses	.81
Total annual fund operating expenses	1.01

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. 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
Service Shares	$103	$322	$558	$1,236

Principal Investment Strategy

The fund pursues its investment objective by investing only in U.S. Treasury securities (i.e., securities issued or guaranteed as to principal and interest by the U.S. government, 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 normally invests at least 80% of its net assets in U.S. Treasury securities (i.e., under normal circumstances, the fund will not invest more than 20% of its net assets in cash), and typically invests exclusively in U.S. Treasury securities.

The fund is managed so that income paid by the fund 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 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. The fund currently is not permitted to impose a fee upon the sale of shares (a "liquidity fee") or temporarily suspend redemptions (a redemption "gate") under distressed conditions as some other types of money market funds are, and the fund's board has no intention to impose a liquidity fee or redemption gate. Neither BNY Mellon Investment Adviser, Inc. nor its affiliates have a legal obligation to provide financial support to the fund, and you should not expect that BNY Mellon Investment Adviser, Inc. or its affiliates will provide financial support to the fund at any time. 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. Very low or negative interest rates may magnify interest rate risk. In addition, a low interest rate environment may prevent the fund from providing a positive yield or paying fund expenses out of fund assets and could impair the fund's ability to maintain a stable net asset value. Interest rates in the United States currently are at or near historic lows due to market forces and actions of the Board of Governors of the Federal Reserve System in the U.S., primarily in response to the novel coronavirus (COVID-19) pandemic and resultant market disruptions. Changing interest rates, including rates that fall below zero, may have unpredictable effects on markets, may result in heightened market volatility and may detract from fund performance.

· 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 Participant shares from year to year. The table shows the average annual total returns of the fund's Participant 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 Participant shares, which are not offered in this prospectus, is shown in the bar chart and table since Service shares are new and past performance information is not available for Service 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, because Service shares have a higher total annual expense ratio than Participant shares, the performance shown for Service shares would have been lower.

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

Best Quarter
Q1, 2019: 0.46%

Worst Quarter
Q3, 2015: 0.00%

The year-to-date total return of the fund's Participant shares as of September 30, 2020 was 0.22%.*


Average Annual Total Returns as of 12/31/19^*
	1 Year	5 Years	10 Years
	1.62%	0.65%	0.32%
For the current yield, call toll-free 1-800-373-9387 (inside the U.S. only). ^* Reflects the performance of the fund's Participant shares, which are offered in a separate prospectus.

Portfolio Management

The fund is managed by Dreyfus Cash Investment Strategies, a division of BNY Mellon Investment Adviser, Inc., the fund's investment adviser.

Purchase and Sale of Fund Shares

The fund's Service shares are available to investors who purchase fund shares through a third party, such as a bank, broker-dealer or financial adviser, or through a Retirement Plan (as defined below). In general, the fund's minimum initial investment for Service shares is $1,000 and the minimum subsequent investment is $1.00. You may sell (redeem) your shares on any business day by contacting your broker-dealer or financial adviser.

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)).

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 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 has been designated as a "government money market fund" (Government Fund). As a Government Fund, the fund 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 seeks to maintain a stable share price of $1.00. 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 normally invests at least 80% of its net assets in U.S. Treasury securities (i.e., under normal circumstances, the fund will not invest more than 20% of its net assets in cash), and typically invests exclusively in U.S. Treasury securities. The fund's policy with respect to the investment of at least 80% of its net assets may be changed by the fund's board upon 60 days' prior notice to shareholders.

Among other requirements, the fund is required to hold at least 30% 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 10% 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.

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.

Investment Risks

An investment in the fund is not 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. The fund currently is not permitted to impose a fee upon the sale of shares (a "liquidity fee") or temporarily suspend redemptions (a redemption "gate") under distressed conditions as some other types of money market funds are, and the fund's board has no intention to impose a liquidity fee or redemption gate. Neither BNY Mellon Investment Adviser, Inc. nor its affiliates have a legal obligation to provide financial support to the fund, and you should not expect that BNY Mellon Investment Adviser, Inc. or its affiliates will provide financial support to the fund at any time. 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. Very low or negative interest rates may magnify interest rate risk. A sharp and unexpected rise in interest rates could impair the fund's ability to maintain a stable net asset value. In addition, a low interest rate environment may prevent the fund from providing a positive yield or paying fund expenses out of fund assets and could impair the fund's ability to maintain a stable net asset value. Interest rates in the United States currently are at or near historic lows due to market forces and actions of the Board of Governors of the Federal Reserve System in the

U.S., primarily in response to the COVID-19 pandemic and resultant market disruptions. Changing interest rates, including rates that fall below zero, 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.

· 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

The fund is managed by Dreyfus Cash Investment Strategies, a division of BNY Mellon Investment Adviser, Inc. (BNYM Investment Adviser), the fund's investment adviser, 240 Greenwich Street, New York, New York 10286. BNYM Investment Adviser manages approximately $301 billion in 129 mutual fund portfolios. For the fiscal year ended January 31, 2020, the fund paid BNYM Investment Adviser a management fee at the effective annual rate of 0.18% of the value of the fund's average daily net assets.

BNYM Investment Adviser has contractually agreed, until November 16, 2021, to waive receipt of its fees and/or assume the direct expenses of the fund so that the direct expenses of the fund's Service shares (excluding taxes, interest, brokerage commissions, commitment fees on borrowing and extraordinary expenses) do not exceed 1.01%. On or after November 16, 2021, BNYM Investment Adviser may terminate this expense limitation agreement at any time. A discussion regarding the basis for the board's approving the fund's management agreement with BNYM Investment Adviser is available in the fund's semiannual report for the six-month period ended July 31, 2020. 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 $41.1 trillion in assets under custody and administration and $2.2 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.

BNY Mellon Securities Corporation (BNYMSC), a wholly-owned subsidiary of BNYM Investment Adviser, serves as distributor of the fund and of the other funds in the BNY Mellon Family of Funds. Any shareholder services fees and administrative services fees, as applicable, are paid to BNYMSC for the provision of shareholder account service and maintenance and recordkeeping and other related services, 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 shareholder services fees and/or administrative services fees or other expenses that may be paid by the 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.

Service shares of the fund are subject to (i) an annual administrative services plan fee of 0.55% payable to the fund's distributor in respect of the provision of recordkeeping and other related services, and (ii) an annual shareholder services plan fee of 0.25% payable to the fund's distributor in respect of the provision of personal services to shareholders, such as answering shareholder inquiries regarding the fund, and/or the maintenance of shareholder accounts. The fund's distributor may pay financial intermediaries from the fees it receives under the shareholder services plan and/or administrative services plan for the provision of such services by the financial intermediaries to their clients who are beneficial owners of Service shares of the fund.

The fund, 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.

Shareholder Guide

Buying and Selling Shares

The fund's Service shares are available to investors who purchase fund shares through a third party, such as a bank, broker-dealer or financial adviser, or through a Retirement Plan. Third parties with whom you open a fund account may impose policies, limitations and fees which are different than those described herein. The fund offers other classes of shares, which are described in separate prospectuses. Third parties purchasing fund shares on behalf of their clients determine which class of shares is suitable for their clients. Consult a representative of your plan or financial institution for further information.

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

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.

When calculating its NAV, 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.

How to Buy Shares

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 time at which the fund's NAV is calculated, and the trading deadline for orders "in proper form" (as defined below), is reflected in the table below. The fund reserves the right to change the time at which the fund's NAV is calculated and the trading deadline to an earlier time than stated below in the case of an emergency, if regular trading on the NYSE is restricted or closes early, the fixed income securities markets or the Federal Reserve Bank close early, or as otherwise permitted by the Securities and Exchange Commission.


Name of Fund	Fund Calculation of NAV/Trading Deadline for Orders in Proper Form
Dreyfus Treasury Securities Cash Management	3:00 p.m.

Eastern time.

Orders in proper form 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 calculates its NAV will become effective at the NAV determined on that day and shares purchased will receive the dividend declared on 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 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 NAV will be priced at the 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.

How to Sell Shares

You may sell (redeem) shares at any time through your financial representative. Your shares will be sold at the next NAV calculated after your order is received in proper form by the fund or a financial intermediary that serves as agent for the fund. For requests to redeem shares received in proper form by the time of day at which the fund calculates its NAV, shares will be priced at the NAV calculated on that day; for requests to redeem shares received after the time of day at which the fund calculates its NAV, shares will be priced at the NAV calculated on the following day. Any certificates representing fund shares being sold must be returned with your redemption request. Your order will be processed promptly.

Redemption proceeds normally will be wired to your financial intermediary within one business day after the request is received in proper form. Payment of redemption proceeds may take longer and may take up to seven days after the order is received in proper form, 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.

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. 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.

All shareholder services and privileges offered to shareholders may be modified or terminated at any time, except as otherwise stated in the fund's Statement of Additional Information (SAI). Please see the fund's SAI for additional information on buying and selling shares, privileges and other shareholder services.

A financial intermediary may have policies that are different from 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.

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 BNYM Investment Adviser 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. BNYM Investment Adviser 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, which may apply to exchanges from or into the fund. If you plan to exchange your fund shares for shares of another fund in the BNY Mellon Family of Funds, please read the prospectus of that other fund for more information.

The fund also reserves the right to:

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

· 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.

Small Account Policy

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.

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 BNYM Investment Adviser 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 an IRA, Retirement Plan or other 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.

Financial Highlights

These financial highlights describe the performance of the fund's Participant 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, except as noted, 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. As Service shares are a new class of the fund, financial highlights information is not available for Service shares as of the date of this prospectus.


Dreyfus Treasury Securities Cash Management		Year Ended January 31,
Participant Shares	Six-Months Ended 7/31/2020^*	2020	2019	2018	2017	2016
Per Share Data ($):
Net asset value, beginning of period	1.00	1.00	1.00	1.00	1.00	1.00
Investment Operations:
Investment income—net	.001	.015	.014	.004	.000^a	.000^a
Distributions:
Dividends from investment income—net	(.001)	(.015)	(.014)	(.004)	(.000)^a	(.000)^a
Net asset value, end of period	1.00	1.00	1.00	1.00	1.00	1.00
Total Return (%)	.13^b	1.55	1.38	.39	.01	.00^c
Ratios/Supplemental Data (%):
Ratio of total expenses to average net assets	.61^d	.61	.61	.61	.61	.61
Ratio of net expenses to average net assets	.41^d	.59	.60	.58	.36	.06
Ratio of net investment income to average net assets	.25^d	1.47	1.36	.39	.01	.00^c
Net Assets, end of period ($ x 1,000)	3,096,686	3,153,603	2,052,791	2,179,683	2,073,661	3,234,511
^* Unaudited. ^aAmount represents less than $.001 per share.
^bNot annualized. ^cAmount represent less than .01%. ^dAnnualized.

For More Information

Dreyfus Treasury Securities Cash Management

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

Annual/Semiannual Report

The fund's annual and semiannual 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 semiannual reports 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

Funds in the BNY Mellon Family of Funds (except Dreyfus money market funds) generally disclose, at www.im.bnymellon.com, (1) complete portfolio holdings as of each month-end with a one month lag and as of each calendar quarter end with a 15-day 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 a 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. For funds in the BNY Mellon Family of Funds (except Dreyfus money market funds), 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. Dreyfus money market funds generally disclose, at www.dreyfus.com, their complete schedule of holdings daily. Each Dreyfus money market fund's daily posting of its complete portfolio holdings will remain available on the website for five months.

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 1-800-373-9387 (inside the U.S. only)

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

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

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

SEC: www.sec.gov

Dreyfus money market funds: www.dreyfus.com

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


© 2020 BNY Mellon Securities Corporation CMGT – P1120SER