0001423799 2025-05-01 2026-04-30 0001423799 dirf:C000061462Member 2025-05-01 2026-04-30 0001423799 dirf:C000061463Member 2025-05-01 2026-04-30 0001423799 dirf:C000061462Member 2026-04-30 0001423799 dirf:NetOtherAssetsAndLiabilitiesMember dirf:C000061462Member 2026-04-30 0001423799 us-gaap:RepurchaseAgreementsMember dirf:C000061462Member 2026-04-30 0001423799 us-gaap:USTreasuryBillSecuritiesMember dirf:C000061462Member 2026-04-30 0001423799 dirf:USTreasuryFloatingRateNotesMember dirf:C000061462Member 2026-04-30 0001423799 us-gaap:USTreasuryNotesSecuritiesMember dirf:C000061462Member 2026-04-30 0001423799 dirf:C000061463Member 2026-04-30 0001423799 dirf:NetOtherAssetsAndLiabilitiesMember dirf:C000061463Member 2026-04-30 0001423799 us-gaap:RepurchaseAgreementsMember dirf:C000061463Member 2026-04-30 0001423799 us-gaap:USTreasuryBillSecuritiesMember dirf:C000061463Member 2026-04-30 0001423799 dirf:USTreasuryFloatingRateNotesMember dirf:C000061463Member 2026-04-30 0001423799 us-gaap:USTreasuryNotesSecuritiesMember dirf:C000061463Member 2026-04-30 iso4217:USD pure dirf:Holding 0.552 0.114 0.240 0.094 -0.000 0.552 0.240 0.114 -0.000 0.094 0001423799 false N-1A N-CSR Dreyfus Institutional Reserves Funds 2026-04-30 Dreyfus Institutional Preferred Treasury Obligations Fund Institutional Shares DNSXX This annual shareholder report contains important information about Dreyfus Institutional Preferred Treasury Obligations Fund (the “Fund”) for the period of May 1, 2025 to April 30, 2026. annual shareholder report You can find additional information about the Fund at<br/><span style="text-decoration-line: underline; color: rgb(0, 0, 0); line-height: 7.5pt; word-break: break-all; font-weight: 400; font-family: 'times new roman'; font-size: 10pt;">www.dreyfus.com/products/mm.html#overview</span>. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com. www.dreyfus.com/products/mm.html#overview 1-800-373-9387 info@bny.com <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 8pt;"><b>This report describes changes to the Fund that occurred during the reporting period.</b></div> <div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 11pt; font-weight: bold; margin-bottom: 2pt;"><b>What were the Fund’s costs for the last </b> <b>year</b> <b>?</b></div> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 3pt;">(based on a hypothetical $10,000 investment)</div> <table style="width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(0, 72, 94); border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); vertical-align: top; text-align: left; width: 25%; padding: 1pt 3pt 10pt 3pt;">Share Class</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); vertical-align: top; text-align: center; width: 30%; padding: 1pt 3pt 10pt 3pt;">Costs of a $10,000 investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); vertical-align: top; text-align: center; width: 40%; padding: 1pt 3pt 10pt 3pt;">Costs paid as a percentage of a $10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; background-color: rgb(227, 235, 237); height: 19pt;"> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: left; text-indent: -6pt; padding: 1pt 3pt 3pt 6pt;">Institutional <span style="white-space: nowrap;">Shares<sup style="vertical-align: super; font-size: 5pt;">*</sup></span></td> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; line-height: 9pt; text-align: center; vertical-align: top; padding: 1pt 3pt 3pt 3pt;"><span style="float: none;">$</span>10</td> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; line-height: 9pt; text-align: center; vertical-align: top; padding: 1pt 3pt 3pt 3pt;">0.10<span>%</span></td> </tr> </table> <table style="width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid; margin-bottom: 22pt;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; margin-bottom: 0; font-style: normal; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 5pt; line-height: normal; width: 10pt; text-align: left; vertical-align: super; padding: 0;">*</td> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; margin-bottom: 0; font-family: 'Times New Roman'; font-size: 9pt; line-height: normal; font-style: normal; text-align: left; vertical-align: top; color: rgb(0, 0, 0); padding: 0;"> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; font-size: 9pt; line-height: normal; font-style: normal; text-align: left; vertical-align: top; color: rgb(0, 0, 0); margin-bottom: 0px; padding: 0px;">During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.</div> </td> </tr> </table> 10 0.0010 <div style="font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 11pt; font-weight: bold; margin-top: 0px; margin-bottom: 0px;"><b>KEY FUND STATISTICS (AS OF </b> <b>4/30/26</b> <b>)</b></div> <table style="width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(0, 72, 94); border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); width: 170pt; vertical-align: top; text-align: center; padding: 1pt 3pt 10pt 3pt;"><br/>Fund Size (Millions)</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); width: 170pt; vertical-align: top; text-align: center; padding: 1pt 3pt 10pt 3pt;"><br/>Number of Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); width: 170pt; vertical-align: top; text-align: center; padding: 1pt 3pt 10pt 3pt;">Total Advisory Fee Paid During<br/>Period</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; background-color: rgb(227, 235, 237); height: 19pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; width: 170pt; font-family: 'Times New Roman'; font-weight: normal; font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: center; color: rgb(0, 0, 0); border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 1pt 3pt 1pt 3pt;"><span style="float: none;">$</span>777</td> <td style="break-inside: avoid-page; page-break-inside: avoid; width: 170pt; font-family: 'Times New Roman'; font-weight: normal; font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: center; color: rgb(0, 0, 0); border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 1pt 3pt 1pt 3pt;">65</td> <td style="break-inside: avoid-page; page-break-inside: avoid; width: 170pt; font-family: 'Times New Roman'; font-weight: normal; font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: center; color: rgb(0, 0, 0); border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 1pt 3pt 1pt 3pt;"><span style="float: none;">$</span>870,381</td> </tr> </table> 777000000 65 870381 <div style="margin-top: 0px; text-transform: uppercase; margin-bottom: 3pt; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; letter-spacing: 0px;"><b>Portfolio Holdings (as of </b> <b>4/30/26</b> <b>)</b></div> <div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; letter-spacing: 0px; text-transform: none; margin-bottom: 0px; page-break-after: avoid;"><b>Allocation of Holdings (Based on Net Assets)</b></div> <div style="font-family: 'times new roman'; font-size: 9pt; font-weight: 400; color: rgb(0, 0, 0); width: 540pt; margin-bottom: 12pt; margin-left: 18pt;"><img alt="Graphical Representation - Top N Holdings Chart" src="chartimages_11849484.jpg" style="margin-left: 50pt; width: 437pt;"/> </div> <div style="font-weight: 400; font-family: 'times new roman'; font-size: 9pt; line-height: 10pt; color: rgb(0, 0, 0); margin-top: -4pt; margin-bottom: 0px;">* Amount represents less than .1%.</div> <div style="font-family: 'times new roman'; font-size: 9pt; font-weight: 400; color: rgb(0, 0, 0); width: 540pt; margin-bottom: 9pt; margin-left: 18pt;"> <div style="font-family: 'times new roman'; font-size: 9pt; font-weight: 400; color: rgb(0, 0, 0); break-inside: avoid;"> <div style="font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 11pt; font-weight: bold; margin-bottom: 4pt; margin-top: 0px;"><b>How has the Fund changed?</b></div> </div> <ul style="counter-reset: numberedlisting 0 letteringlisting 0 letteredhead 0 lcrmnhead 0 ucletteredhead 0 ucrmnhead 0; break-inside: avoid; padding: 0; margin: 0;"> <li style="font-weight: 400; padding-left: 3pt; margin-left: 7pt; list-style-type: disc; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 3pt;"> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 8pt;">Effective on May 29, 2026, the Fund changed its name to BNY Dreyfus Institutional Preferred Treasury Obligations Fund.</div> </li> </ul> </div> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 10pt;"><b>This is a summary of certain changes to the Fund since </b> <b>May 1, 2025</b> <b>. For more complete information, you may review the Fund’s </b> <b>current prospectus dated </b> <b>August 29, 2025</b> <b> as supplemented on March 13, 2026</b> <b> at </b> <span style="white-space: nowrap;"> <span style="text-decoration-line: underline; color: rgb(0, 0, 0); line-height: 8.5pt; word-break: break-all; font-weight: bold; font-family: 'times new roman'; font-size: 10pt;">www.dreyfus.com/products/mm.html#overview</span> </span> <b> or upon request at 1-800-373-9387.</b></div> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 8pt;">Effective on May 29, 2026, the Fund changed its name to BNY Dreyfus Institutional Preferred Treasury Obligations Fund.</div> 2026-05-29 <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 10pt;"><b>This is a summary of certain changes to the Fund since </b> <b>May 1, 2025</b> <b>. For more complete information, you may review the Fund’s </b> <b>current prospectus dated </b> <b>August 29, 2025</b> <b> as supplemented on March 13, 2026</b> <b> at </b> <span style="white-space: nowrap;"> <span style="text-decoration-line: underline; color: rgb(0, 0, 0); line-height: 8.5pt; word-break: break-all; font-weight: bold; font-family: 'times new roman'; font-size: 10pt;">www.dreyfus.com/products/mm.html#overview</span> </span> <b> or upon request at 1-800-373-9387.</b></div> www.dreyfus.com/products/mm.html#overview 1-800-373-9387 Dreyfus Institutional Preferred Treasury Obligations Fund Hamilton Shares DHLXX This annual shareholder report contains important information about Dreyfus Institutional Preferred Treasury Obligations Fund (the “Fund”) for the period of May 1, 2025 to April 30, 2026. annual shareholder report You can find additional information about the Fund at<br/><span style="text-decoration-line: underline; color: rgb(0, 0, 0); line-height: 7.5pt; word-break: break-all; font-weight: 400; font-family: 'times new roman'; font-size: 10pt;">www.dreyfus.com/products/mm.html#overview</span>. You can also request this information by calling 1-800-373-9387 (inside the U.S. only) or by sending an e-mail request to info@bny.com. www.dreyfus.com/products/mm.html#overview 1-800-373-9387 info@bny.com <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 8pt;"><b>This report describes changes to the Fund that occurred during the reporting period.</b></div> <div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 11pt; font-weight: bold; margin-bottom: 2pt;"><b>What were the Fund’s costs for the last </b> <b>year</b> <b>?</b></div> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 3pt;">(based on a hypothetical $10,000 investment)</div> <table style="width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(0, 72, 94); border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); vertical-align: top; text-align: left; width: 25%; padding: 1pt 3pt 10pt 3pt;">Share Class</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); vertical-align: top; text-align: center; width: 30%; padding: 1pt 3pt 10pt 3pt;">Costs of a $10,000 investment</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); vertical-align: top; text-align: center; width: 40%; padding: 1pt 3pt 10pt 3pt;">Costs paid as a percentage of a $10,000 investment</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; background-color: rgb(227, 235, 237); height: 19pt;"> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: left; text-indent: -6pt; padding: 1pt 3pt 3pt 6pt;">Hamilton <span style="white-space: nowrap;">Shares<sup style="vertical-align: super; font-size: 5pt;">*</sup></span></td> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; line-height: 9pt; text-align: center; vertical-align: top; padding: 1pt 3pt 3pt 3pt;"><span style="float: none;">$</span>15</td> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; white-space: nowrap; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 9pt; line-height: 9pt; text-align: center; vertical-align: top; padding: 1pt 3pt 3pt 3pt;">0.15<span>%</span></td> </tr> </table> <table style="width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid; margin-bottom: 22pt;"> <tr style="break-inside: avoid-page; page-break-inside: avoid; height: auto; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; margin-bottom: 0; font-style: normal; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 5pt; line-height: normal; width: 10pt; text-align: left; vertical-align: super; padding: 0;">*</td> <td style="font-weight: 400; break-inside: avoid-page; page-break-inside: avoid; margin-bottom: 0; font-family: 'Times New Roman'; font-size: 9pt; line-height: normal; font-style: normal; text-align: left; vertical-align: top; color: rgb(0, 0, 0); padding: 0;"> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; font-size: 9pt; line-height: normal; font-style: normal; text-align: left; vertical-align: top; color: rgb(0, 0, 0); margin-bottom: 0px; padding: 0px;">During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc.</div> </td> </tr> </table> 15 0.0015 <div style="font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 11pt; font-weight: bold; margin-top: 0px; margin-bottom: 0px;"><b>KEY FUND STATISTICS (AS OF </b> <b>4/30/26</b> <b>)</b></div> <table style="width: 100%; border-collapse: collapse; page-break-inside: avoid; break-inside: avoid;"> <tr style="break-after: avoid; break-inside: avoid-page; page-break-inside: avoid; height: auto; background-color: rgb(0, 72, 94); border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial;"> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); width: 170pt; vertical-align: top; text-align: center; padding: 1pt 3pt 10pt 3pt;"><br/>Fund Size (Millions)</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); width: 170pt; vertical-align: top; text-align: center; padding: 1pt 3pt 10pt 3pt;"><br/>Number of Holdings</td> <td style="break-inside: avoid-page; page-break-inside: avoid; font-family: 'Times New Roman'; font-size: 9pt; line-height: 9pt; font-weight: bold; color: rgb(255, 255, 255); width: 170pt; vertical-align: top; text-align: center; padding: 1pt 3pt 10pt 3pt;">Total Advisory Fee Paid During<br/>Period</td> </tr> <tr style="break-inside: avoid-page; page-break-inside: avoid; border-bottom-color: initial; border-bottom-style: none; border-bottom-width: initial; background-color: rgb(227, 235, 237); height: 19pt;"> <td style="break-inside: avoid-page; page-break-inside: avoid; width: 170pt; font-family: 'Times New Roman'; font-weight: normal; font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: center; color: rgb(0, 0, 0); border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 1pt 3pt 1pt 3pt;"><span style="float: none;">$</span>777</td> <td style="break-inside: avoid-page; page-break-inside: avoid; width: 170pt; font-family: 'Times New Roman'; font-weight: normal; font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: center; color: rgb(0, 0, 0); border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 1pt 3pt 1pt 3pt;">65</td> <td style="break-inside: avoid-page; page-break-inside: avoid; width: 170pt; font-family: 'Times New Roman'; font-weight: normal; font-size: 9pt; line-height: 9pt; vertical-align: top; text-align: center; color: rgb(0, 0, 0); border-left-color: initial; border-left-style: none; border-left-width: initial; padding: 1pt 3pt 1pt 3pt;"><span style="float: none;">$</span>870,381</td> </tr> </table> 777000000 65 870381 <div style="margin-top: 0px; text-transform: uppercase; margin-bottom: 3pt; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; letter-spacing: 0px;"><b>Portfolio Holdings (as of </b> <b>4/30/26</b> <b>)</b></div> <div style="margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 9pt; font-weight: bold; letter-spacing: 0px; text-transform: none; margin-bottom: 0px; page-break-after: avoid;"><b>Allocation of Holdings (Based on Net Assets)</b></div> <div style="font-family: 'times new roman'; font-size: 9pt; font-weight: 400; color: rgb(0, 0, 0); width: 540pt; margin-bottom: 12pt; margin-left: 18pt;"><img alt="Graphical Representation - Top N Holdings Chart" src="chartimages_11849433.jpg" style="margin-left: 50pt; width: 437pt;"/> </div> <div style="font-weight: 400; font-family: 'times new roman'; font-size: 9pt; line-height: 10pt; color: rgb(0, 0, 0); margin-top: -4pt; margin-bottom: 0px;">* Amount represents less than .1%.</div> <div style="font-family: 'times new roman'; font-size: 9pt; font-weight: 400; color: rgb(0, 0, 0); width: 540pt; margin-bottom: 9pt; margin-left: 18pt;"> <div style="font-family: 'times new roman'; font-size: 9pt; font-weight: 400; color: rgb(0, 0, 0); break-inside: avoid;"> <div style="font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 11pt; font-weight: bold; margin-bottom: 4pt; margin-top: 0px;"><b>How has the Fund changed?</b></div> </div> <ul style="counter-reset: numberedlisting 0 letteringlisting 0 letteredhead 0 lcrmnhead 0 ucletteredhead 0 ucrmnhead 0; break-inside: avoid; padding: 0; margin: 0;"> <li style="font-weight: 400; padding-left: 3pt; margin-left: 7pt; list-style-type: disc; font-family: 'Times New Roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 3pt;"> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 8pt;">Effective on May 29, 2026, the Fund changed its name to BNY Dreyfus Institutional Preferred Treasury Obligations Fund.</div> </li> </ul> </div> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 10pt;"><b>This is a summary of certain changes to the Fund since </b> <b>May 1, 2025</b> <b>. For more complete information, you may review the Fund’s </b> <b>current prospectus dated </b> <b>August 29, 2025</b> <b> as supplemented on March 13, 2026</b> <b> at </b> <span style="white-space: nowrap;"> <span style="text-decoration-line: underline; color: rgb(0, 0, 0); line-height: 8.5pt; word-break: break-all; font-weight: bold; font-family: 'times new roman'; font-size: 10pt;">www.dreyfus.com/products/mm.html#overview</span> </span> <b> or upon request at 1-800-373-9387.</b></div> <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 8pt;">Effective on May 29, 2026, the Fund changed its name to BNY Dreyfus Institutional Preferred Treasury Obligations Fund.</div> 2026-05-29 <div style="font-weight: 400; margin-top: 0px; font-family: 'times new roman'; color: rgb(0, 0, 0); font-size: 10pt; line-height: 11pt; margin-bottom: 10pt;"><b>This is a summary of certain changes to the Fund since </b> <b>May 1, 2025</b> <b>. For more complete information, you may review the Fund’s </b> <b>current prospectus dated </b> <b>August 29, 2025</b> <b> as supplemented on March 13, 2026</b> <b> at </b> <span style="white-space: nowrap;"> <span style="text-decoration-line: underline; color: rgb(0, 0, 0); line-height: 8.5pt; word-break: break-all; font-weight: bold; font-family: 'times new roman'; font-size: 10pt;">www.dreyfus.com/products/mm.html#overview</span> </span> <b> or upon request at 1-800-373-9387.</b></div> www.dreyfus.com/products/mm.html#overview 1-800-373-9387 During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. During the period, fees were waived and/or expenses reimbursed pursuant to an agreement with the Fund’s investment adviser, BNY Mellon Investment Adviser, Inc. Amount represents less than .1%. Amount represents less than .1%.