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amifi:S000027380BloombergMunicipalBondIndexMember 2016-01-01 2025-12-31 iso4217:USD pure 0000798737 false 485BPOS 2026-05-31 0.0574 0.0386 0.0034 -0.0983 0.0230 0.0604 0.0698 0.0250 0.0476 0.0024 Calendar Year End (%) During the period shown in the bar chart, the Portfolio’s: Best Quarter was up 6.98%, 4th quarter, 2023; and Worst Quarter was down -5.86%, 1st quarter, 2022. -0.1537 0.0633 0.0435 0.0400 -0.0015 0.0991 0.0084 0.1054 0.0492 0.0623 Calendar Year End (%) During the period shown in the bar chart, the Portfolio’s: Best Quarter was up 10.15%, 4th quarter, 2023; and Worst Quarter was down -7.60%, 1st quarter, 2022. 0.0485 0.0210 -0.0876 0.0665 0.0235 0.0369 -0.0042 0.0553 0.0029 0.0678 Calendar Year End (%) During the period shown in the bar chart, the Portfolio’s: Best Quarter was up 6.97%, 4th quarter, 2023; and Worst Quarter was down -5.44%, 1st quarter, 2022. 0.0011 0.0547 0.0011 0.0707 0.0330 0.0347 -0.1004 0.0526 0.0297 0.0317 Calendar Year End (%) During the period shown in the bar chart, the Portfolio’s: Best Quarter was up 6.37%, 4th quarter, 2023; and Worst Quarter was down -5.80%, 1st quarter, 2022. N-1A AB MUNICIPAL INCOME FUND, INC. 2026-09-30 SUMMARY INFORMATION AB National Portfolio INVESTMENT OBJECTIVE: <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The investment objective of the Portfolio is to earn the highest level of current income, exempt from federal income tax, that is available without assuming what the Adviser considers to be undue risk to principal or income. </div> FEES AND EXPENSES OF THE PORTFOLIO: <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. <span style="font-weight:bold">You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Advisor Class</span><span style="font-weight:bold"></span><span style="font-weight:bold"> shares, which are not reflected in the tables or the examples below.</span> You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios—Sales Charge Reduction Programs for Class A Shares on page 46 of this Prospectus, in Appendix B—Financial Intermediary Waivers of this Prospectus and in Purchase of Shares—Sales Charge Reduction Programs for Class A Shares on page 126 of the Portfolio’s Statement of Additional Information (“SAI”). </div> You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. 100000 Shareholder Fees (fees paid directly from your investment) 0.0300 0 0 0 0.0100 0 0 0 0 Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0045 0.0045 0.0045 0.0025 0.0100 0 0.0006 0.0006 0.0006 0.0004 0.0004 0.0004 0.0010 0.0010 0.0010 0.0080 0.0155 0.0055 -0.0005 -0.0005 -0.0005 0.0075 0.0150 0.0050 For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. September 30, 2027 Examples <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio’s </div> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;"> operating expenses stay the same and that any fee waiver and/or expense limitation remains in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be: </div> 374 253 51 543 485 171 726 840 302 1256 1639 684 Portfolio Turnover <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 21% of the average value of its portfolio. </div> 0.21 PRINCIPAL STRATEGIES: <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers. The Portfolio may invest more than 25% of its assets in a single state. </div> <div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Portfolio. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Portfolio’s other holdings. </div> <div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The Portfolio may also invest in: </div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;">forward commitments; </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;">tender option bonds (“TOBs”);<span style="font-weight:bold"> </span> </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;">zero‑coupon municipal securities and variable, floating and inverse floating-rate municipal securities; </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;">certain types of mortgage-related securities; and </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;">derivatives, such as options, futures contracts, forwards and swaps. </div> </td> </tr> </table> As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Market Risk:</span> The value of the Portfolio’s assets will fluctuate as the market or markets in which the Portfolio invests fluctuate. The value of the Portfolio’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other local, regional or global events, including public health crises (including the occurrence of a contagious disease or illness), terrorism, war, changing interest rate levels, the imposition of new or additional tariffs, or global conflicts, any of which can affect large portions of the securities markets. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Interest Rate Risk:</span> Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of existing investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. Changing interest rates may have unpredictable effects on the markets, may result in heightened market volatility and may detract from Portfolio performance. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Duration Risk:</span> Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to the full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Municipal Market Risk:</span> This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio’s investments in municipal securities. These factors include economic conditions, political or legislative changes, public health crises, uncertainties related to the tax status of municipal securities, and the rights of investors in these securities. To the extent that the Portfolio invests more of its assets in the municipal securities of a particular state or territory, the Portfolio may be vulnerable to events adversely affecting that state or territory, including economic, </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:2%;"> </td> <td style="vertical-align:top;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;"> political and regulatory occurrences, court decisions, terrorism, public health crises (including the occurrence of a contagious disease or illness) and catastrophic natural disasters, such as hurricanes, fires or earthquakes. The Portfolio’s investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project’s ability to make payments of principal and interest on these securities. </div> </td> </tr> </table> <div style="margin-top:6pt;margin-bottom:0pt;margin-left:2%;font-size:10pt;font-family:times new roman;">In addition, changes in tax rates or the treatment of income from certain types of municipal securities, among other things, could negatively affect the municipal securities markets. </div> <div style="margin-top:6pt;margin-bottom:0pt;margin-left:2%;font-size:10pt;font-family:times new roman;">The municipal securities issued by Puerto Rico and its government agencies and municipalities may have more risks than those of other U.S. issuers of municipal securities. Puerto Rico continues to face a challenging economic and fiscal environment. If the general economic situation in Puerto Rico persists or worsens, the volatility and credit quality of Puerto Rican municipal securities could continue to be adversely affected, and the market for such securities may deteriorate further. </div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Inflation Risk:</span> This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio’s assets can decline as can the value of the Portfolio’s distributions. This risk is significantly greater for fixed-income securities with longer maturities. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Credit Risk:</span> An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security and accrued interest. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Tax Risk:</span> There is no guarantee that the income on the Portfolio’s municipal securities will be exempt from regular U.S. federal, and if applicable, state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in U.S. federal income tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio’s net asset value (“NAV”) could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio’s yield. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Illiquid Investments Risk:</span> Illiquid investments risk exists when certain investments are or become difficult to purchase or sell. Difficulty in selling such investments may result in sales at disadvantageous prices affecting the value of your investment in the Portfolio. Causes of illiquid investments risk may include low trading volumes, large positions and heavy redemptions of Portfolio shares. Illiquid investments risk may be higher in a rising interest rate environment, when the value and liquidity of fixed-income securities generally decline. Municipal securities may have more illiquid investments risk than other fixed-income securities because they trade less frequently and the market for municipal securities is generally smaller than many other markets. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Derivatives Risk:</span> Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Portfolio. A short position in a derivative instrument involves the risk of a theoretically unlimited increase in the value of the underlying asset, reference rate or index, which could cause the Portfolio to suffer a potentially unlimited loss. Derivatives, especially over‑the‑counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Portfolio. </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;"><span style="font-weight:bold">Management Risk:</span> The Portfolio is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected. </div> </td> </tr> </table> <div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">As with all investments, you may lose money by investing in the Portfolio. </div> BAR CHART AND PERFORMANCE INFORMATION: <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing: </div> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;">how the Portfolio’s performance changed from year to year over ten years; and </div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse:collapse;font-family:times new roman;font-size:10pt;border-spacing:0px;width:100%"> <tr style="page-break-inside:avoid"> <td style="width:1%;vertical-align:top;text-align:left;">•</td> <td style="width:1%;vertical-align:top;"> </td> <td style="vertical-align:top;text-align:left;"> <div style="margin-top:0pt;margin-bottom:0pt;font-family:times new roman;font-size:10pt;text-align:left;">how the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index. </div> </td> </tr> </table> <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">You may obtain updated performance information on the Portfolio’s website at <span style="text-decoration:underline">www.abfunds.com</span> (click on “Investments—Mutual Funds”). </div> <div style="margin-top:6pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future. </div> how the Portfolio’s performance changed from year to year over ten years; and how the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index. www.abfunds.com The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future. Bar Chart <div style="margin-top:0pt;margin-bottom:0pt;font-size:10pt;font-family:times new roman;">The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through June 30, 2026, the year‑to‑date unannualized return for Class A shares was 2.39%. </div> The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. 2026-06-30 year‑to‑date 0.0239 Best Quarter 0.0698 2023-12-31 Worst Quarter -0.0586 2022-03-31 Performance Table Average Annual Total Returns (For the periods ended December 31, 2025) 0.0073 0.0020 0.0187 0.0069 0.0016 0.0184 0.0178 0.0074 0.0205 0.0220 0.0008 0.0142 0.0412 0.0107 0.0244 0.0425 0.0080 0.0234 After‑tax Returns: –Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; After‑tax Returns: –Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; actual after‑tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and–Are not relevant to investors who hold Portfolio shares through tax‑deferred arrangements such as 401(k) plans or individual retirement accounts. AB High Income Municipal Portfolio INVESTMENT OBJECTIVE: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The investment objective of the Portfolio is to earn the highest level of current income, exempt from federal income tax, that is available consistent with what the Adviser considers to be an appropriate level of risk.</div> FEES AND EXPENSES OF THE PORTFOLIO: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. <span style="font-weight: bold;">You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Advisor Class</span><span style="font-weight: bold;"></span><span style="font-weight: bold;"> shares, which are not reflected in the tables or the examples below.</span> You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios—Sales Charge Reduction Programs for Class A Shares on page 46 of this Prospectus, in Appendix B—Financial Intermediary Waivers of this Prospectus and in Purchase of Shares—Sales Charge Reduction Programs for Class A Shares on page 126 of the Portfolio’s Statement of Additional Information (“SAI”).</div> You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. 100000 Shareholder Fees (fees paid directly from your investment) 0.0300 0 0 0 0 0.0100 0 0 0 0 0 0 Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0050 0.0050 0.0050 0.0050 0.0025 0.0100 0 0 0.0004 0.0004 0.0004 0.0002 0.0042 0.0042 0.0042 0.0042 0.0003 0.0003 0.0003 0.0003 0.0049 0.0049 0.0049 0.0047 0.0124 0.0199 0.0099 0.0097 -0.0002 -0.0002 -0.0002 0.0000 0.0122 0.0197 0.0097 0.0097 For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. September 30, 2027 Examples <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of these periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio’s operating expenses stay the same and that any fee waiver and/or expense limitation remains in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</div> 421 300 99 99 680 622 313 309 959 1071 545 536 1753 2122 1211 1190 Portfolio Turnover <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 21% of the average value of its portfolio.</div> 0.21 PRINCIPAL STRATEGIES: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio pursues its objective by investing principally in high-yielding municipal securities that may be non‑investment grade or investment grade. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Portfolio. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Portfolio’s other holdings.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio may invest without limit in lower-rated securities (“junk bonds”), which may include securities having the lowest rating, and in unrated securities that, in the Adviser’s judgment, would be lower-rated securities if rated. The Portfolio may invest in fixed-income securities with any maturity or duration. The Portfolio will seek to increase income for shareholders by investing in longer-maturity bonds. Consistent with its objective of seeking a higher level of income, the Portfolio may experience greater volatility and a higher risk of loss of principal than other municipal funds.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio may also invest in:</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">forward commitments;</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">tender option bonds (“TOBs”);</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">zero‑coupon municipal securities and variable, floating and inverse floating-rate municipal securities;</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">certain types of mortgage-related securities; and</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">derivatives, such as options, futures contracts, forwards and swaps.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio may make short sales of securities or maintain a short position, and may use other investment techniques.</div> As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Market Risk:</span> The value of the Portfolio’s assets will fluctuate as the market or markets in which the Portfolio invests fluctuate. The value of the Portfolio’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other local, regional or global events, including public health crises (including the occurrence of a contagious disease or illness), terrorism, war, changing interest rate levels, the imposition of new or additional tariffs, or global conflicts, any of which can affect large portions of the securities markets.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Interest Rate Risk:</span> Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of existing investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 2%;"> </td> <td style="vertical-align: top;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt;">durations. Changing interest rates may have unpredictable effects on the markets, may result in heightened market volatility and may detract from Portfolio performance. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Duration Risk:</span> Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to the full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Below Investment Grade Securities Risk:</span> Investments in fixed-income securities with lower ratings (commonly known as “junk bonds”) have a higher probability that an issuer will default or fail to meet its payment obligations. These securities may be subject to greater price volatility due to such factors as specific corporate developments, interest rate sensitivity and negative performance of the junk bond market generally and may be more difficult to trade than other types of securities.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Municipal Market Risk:</span> This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio’s investments in municipal securities. These factors include economic conditions, political or legislative changes, public health crises, uncertainties related to the tax status of municipal securities, and the rights of investors in these securities. To the extent that the Portfolio invests more of its assets in the municipal securities of a particular state or territory, the Portfolio may be vulnerable to events adversely affecting that state or territory, including economic, political and regulatory occurrences, court decisions, terrorism, public health crises (including the occurrence of a contagious disease or illness) and catastrophic natural disasters, such as hurricanes, fires or earthquakes. The Portfolio’s investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project’s ability to make payments of principal and interest on these securities.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; margin-left: 2%; font-size: 10pt; font-family: times new roman;">In addition, changes in tax rates or the treatment of income from certain types of municipal securities, among other things, could negatively affect the municipal securities markets.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; margin-left: 2%; font-size: 10pt; font-family: times new roman;">The municipal securities issued by Puerto Rico and its government agencies and municipalities may have more risks than those of other U.S. issuers of municipal securities. Puerto Rico continues to face a challenging economic and fiscal environment. If the general economic situation in Puerto Rico persists or worsens, the volatility and credit quality of Puerto Rican municipal securities could continue to be adversely affected, and the market for such securities may deteriorate further.</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Inflation Risk:</span> This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio’s assets can decline as can the value of the Portfolio’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Credit Risk:</span> An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security and accrued interest. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Leverage Risk:</span> To the extent the Portfolio uses leveraging techniques, such as TOBs, its net asset value (“NAV”) may be more volatile because leverage tends to exaggerate the effect of changes in interest rates and any increase or decrease in the value of the Portfolio’s investments.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Tax Risk:</span> There is no guarantee that the income on the Portfolio’s municipal securities will be exempt from regular U.S. federal, and if applicable, state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in U.S. federal income tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio’s NAV could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio’s yield.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Illiquid Investments Risk:</span> Illiquid investments risk exists when certain investments are or become difficult to purchase or sell. Difficulty in selling such investments may result in sales at disadvantageous prices affecting the value of your investment in the Portfolio. Causes of illiquid investments risk may include low trading volumes, large positions and heavy redemptions of Portfolio shares. Illiquid investments risk may be higher in a rising interest rate environment, when the value and liquidity of fixed-income securities generally decline. Municipal securities may have more illiquid investments risk than other fixed-income securities because they trade less frequently and the market for municipal securities is generally smaller than many other markets.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Derivatives Risk:</span> Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Portfolio. A short position in a derivative instrument involves the risk of a theoretically unlimited increase in the value of the underlying asset, reference rate or index, which could cause the Portfolio to suffer a potentially unlimited loss. Derivatives, especially over‑the‑counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Portfolio.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Tender Option Bonds Risk: </span>The Portfolio’s participation in TOB transactions may reduce the Portfolio’s returns and increase volatility and expose the Portfolio to credit risk and leverage risk. Investments in TOB transactions typically will involve greater risk than investments in fixed-rate municipal bonds, including the risk of loss of principal. The interest payments that the Portfolio receives in connection with a TOB transaction (“inverse floaters”) vary inversely with short-term interest rates and will be reduced, or potentially eliminated, when short-term interest rates rise. The Portfolio will be subject to leverage risk to the extent that the Portfolio uses the proceeds from a TOB transaction to invest in other securities. If the interest expense on borrowings or other costs of the leverage approach the net return on the Portfolio’s investment portfolio or investments made through leverage, as applicable, the benefit of leverage to the Portfolio’s shareholders will be reduced. If the interest expense on borrowings or other costs of leverage were to exceed the net return to the Portfolio, the Portfolio’s use of leverage would result in a lower rate of net return than if the Portfolio were not leveraged. During periods of rising short-term interest rates, the interest paid on floaters in TOBs would increase, which may adversely affect the Portfolio’s net return. The Portfolio’s investment in a TOB will generally underperform the market for fixed-rate municipal securities when interest rates rise. The value of inverse floaters may be volatile and there may be limited liquidity in the market for inverse floaters. Because investments in inverse floaters issued in TOB transactions are derivative instruments, these investments are also subject to the risks associated with investments in derivatives.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Management Risk:</span> The Portfolio is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">As with all investments, you may lose money by investing in the Portfolio.</div> BAR CHART AND PERFORMANCE INFORMATION: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%;"> </td> <td style="width: 2%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">how the Portfolio’s performance changed from year to year over ten years; and</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%;"> </td> <td style="width: 2%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">how the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">You may obtain updated performance information on the Portfolio’s website at <span style="text-decoration: underline;">www.abfunds.com</span> (click on “Investments—Mutual Funds”).</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.</div> how the Portfolio’s performance changed from year to year over ten years; andhow the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index. www.abfunds.com The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future. Bar Chart <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through June 30, 2026, the year‑to‑date unannualized return for Class A shares was 3.47%.</div> The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. 2026-06-30 year‑to‑date 0.0347 Best Quarter 0.1015 2023-12-31 Worst Quarter -0.0760 2022-03-31 Performance Table Average Annual Total Returns (For the periods ended December 31, 2025) 0.0087 0.0013 0.0259 0.0078 0.0002 0.0251 0.0214 0.0083 0.0279 0.0233 0.0000 0.0215 0.0436 0.0101 0.0317 0.0426 0.0099 0.0317 0.0425 0.0080 0.0234 After‑tax Returns:–Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; After‑tax Returns:   – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; actual after‑tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and   – Are not relevant to investors who hold Portfolio shares through tax‑deferred arrangements such as 401(k) plans or individual retirement accounts. 2018-09-28 AB California Portfolio INVESTMENT OBJECTIVE: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The investment objective of the Portfolio is to earn the highest level of current income, exempt from federal income tax and California personal income tax, that is available without assuming what the Adviser considers to be undue risk to income or principal.</div> FEES AND EXPENSES OF THE PORTFOLIO: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. <span style="font-weight: bold;">You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Advisor Class</span><span style="font-weight: bold;"></span><span style="font-weight: bold;"> shares, which are not reflected in the tables or the examples below. </span>You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios—Sales Charge Reduction Programs for Class A Shares on page 46 of this Prospectus, in Appendix B—Financial Intermediary Waivers of this Prospectus and in Purchase of Shares—Sales Charge Reduction Programs for Class A Shares on page 126 of the Portfolio’s Statement of Additional Information (“SAI”).</div> You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. 100000 Shareholder Fees (fees paid directly from your investment) 0.0300 0 0 0 0.0100 0 0 0 0 Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0045 0.0045 0.0045 0.0025 0.0100 0 0.0005 0.0005 0.0005 0.0004 0.0004 0.0004 0.0009 0.0009 0.0009 0.0079 0.0154 0.0054 -0.0004 -0.0004 -0.0004 0.0075 0.0150 0.0050 For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. September 30, 2027 Examples <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio’s</div> <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">operating expenses stay the same and that any fee waiver and/or expense limitation remains in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</div> 374 253 51 541 483 169 722 836 298 1245 1629 673 Portfolio Turnover <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 21% of the average value of its portfolio.</div> 0.21 PRINCIPAL STRATEGIES: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of California or municipal securities with interest that is otherwise exempt from California state income tax.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Portfolio. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Portfolio’s other holdings.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio may also invest in:</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">forward commitments;</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">tender option bonds (“TOBs”);</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">zero‑coupon municipal securities and variable, floating and inverse floating-rate municipal securities;</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">certain types of mortgage-related securities; and</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">derivatives, such as options, futures contracts, forwards and swaps.</div> </td> </tr> </table> As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Market Risk:</span> The value of the Portfolio’s assets will fluctuate as the market or markets in which the Portfolio invests fluctuate. The value of the Portfolio’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other local, regional or global events, including public health crises (including the occurrence of a contagious disease or illness), terrorism, war, changing interest rate levels, the imposition of new or additional tariffs, or global conflicts, any of which can affect large portions of the securities markets.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Interest Rate Risk:</span> Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of existing investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. Changing interest rates may have unpredictable effects on the markets, may result in heightened market volatility and may detract from Portfolio performance. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Duration Risk:</span> Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to the full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Municipal Market Risk:</span> This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio’s investments in municipal securities. These factors include economic</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 2%;"> </td> <td style="vertical-align: top;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt;">conditions, political or legislative changes, catastrophic natural disasters, public health crises, uncertainties related to the tax status of municipal securities, and the rights of investors in these securities. To the extent that the Portfolio invests more of its assets in the municipal securities of a particular state or territory, the Portfolio may be vulnerable to events adversely affecting that state or territory. The Portfolio’s investments in California municipal securities may be vulnerable to events adversely affecting its economy. California’s economy, the largest of the 50 states, is relatively diverse, which makes it less vulnerable to events affecting a particular industry. However, there remain a number of risks that threaten the state’s economy, including potentially unfavorable changes to federal policies, the uncertain impact of changes in federal tax law and trade policy, significant unfunded liabilities of the two main retirement systems managed by state entities, the California Public Employees’ Retirement System and the California State Teachers’ Retirement System and public health crises (including the occurrence of a contagious disease or illness). California’s economy may also be affected by natural disasters, such as earthquakes, droughts, flooding or fires. The Portfolio’s investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project’s ability to make payments of principal and interest on these securities.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; margin-left: 2%; font-size: 10pt; font-family: times new roman;">In addition, changes in tax rates or the treatment of income from certain types of municipal securities, among other things, could negatively affect the municipal securities markets.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; margin-left: 2%; font-size: 10pt; font-family: times new roman;">The municipal securities issued by Puerto Rico and its government agencies and municipalities may have more risks than those of other U.S. issuers of municipal securities. Puerto Rico continues to face a challenging economic and fiscal environment. If the general economic situation in Puerto Rico persists or worsens, the volatility and credit quality of Puerto Rican municipal securities could continue to be adversely affected, and the market for such securities may deteriorate further.</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Inflation Risk:</span> This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio’s assets can decline as can the value of the Portfolio’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Credit Risk:</span> An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security and accrued interest. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Tax Risk:</span> There is no guarantee that the income on the Portfolio’s municipal securities will be exempt from regular U.S. federal, and if applicable, state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in U.S. federal income tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio’s net asset value (“NAV”) could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio’s yield.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Illiquid Investments Risk:</span> Illiquid investments risk exists when certain investments are or become difficult to purchase or sell. Difficulty in selling such investments may result in sales at disadvantageous prices affecting the value of your investment in the Portfolio. Causes of illiquid investments risk may include low trading volumes, large positions and heavy redemptions of Portfolio shares. Illiquid investments risk may be higher in a rising interest rate environment, when the value and liquidity of fixed-income securities generally decline. Municipal securities may have more illiquid investments risk than other fixed-income securities because they trade less frequently and the market for municipal securities is generally smaller than many other markets.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Derivatives Risk:</span> Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Portfolio. A short position in a derivative instrument involves the risk of a theoretically unlimited increase in the value of the underlying asset, reference rate or index, which could cause the Portfolio to suffer a potentially unlimited loss. Derivatives, especially over‑the‑counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Portfolio.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Management Risk:</span> The Portfolio is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 2%;"> </td> <td style="vertical-align: top;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt;">techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">As with all investments, you may lose money by investing in the Portfolio.</div> BAR CHART AND PERFORMANCE INFORMATION: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">how the Portfolio’s performance changed from year to year over ten years; and</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">how the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">You may obtain updated performance information on the Portfolio’s website at <span style="text-decoration: underline;">www.abfunds.com</span> (click on “Investments—Mutual Funds”).</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.</div> how the Portfolio’s performance changed from year to year over ten years; andhow the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index. www.abfunds.com The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future. Bar Chart <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through June 30, 2026, the year‑to‑date unannualized return for Class A shares was 2.17%.</div> The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. 2026-06-30 year‑to‑date 0.0217 Best Quarter 0.0697 2023-12-31 Worst Quarter -0.0544 2022-03-31 Performance Table Average Annual Total Returns (For the periods ended December 31, 2025) 0.0062 0.0045 0.0190 0.0058 0.0039 0.0186 0.0165 0.0091 0.0209 0.0182 0.0029 0.0144 0.0395 0.0132 0.0247 0.0425 0.0080 0.0234 After‑tax Returns:–Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; After‑tax Returns:   – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; actual after‑tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and   – Are not relevant to investors who hold Portfolio shares through tax‑deferred arrangements such as 401(k) plans or individual retirement accounts. AB New York Portfolio INVESTMENT OBJECTIVE: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The investment objective of the Portfolio is to earn the highest level of current income exempt from both federal income tax and New York State and City income tax that is available without assuming what the Adviser considers to be undue risk to principal or income.</div> FEES AND EXPENSES OF THE PORTFOLIO: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Portfolio. <span style="font-weight: bold;">You may be required to pay commissions and/or other forms of compensation to a broker for transactions in Advisor Class</span><span style="font-weight: bold;"></span><span style="font-weight: bold;"> shares, which are not reflected in the tables or the examples below.</span> You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. More information about these and other discounts is available from your financial intermediary and in Investing in the Portfolios—Sales Charge Reduction Programs for Class A Shares on page 46 of this Prospectus, in Appendix B—Financial Intermediary Waivers of this Prospectus and in Purchase of Shares—Sales Charge Reduction Programs for Class A Shares on page 126 of the Portfolio’s Statement of Additional Information (“SAI”).</div> You may qualify for sales charge reductions if you and members of your family invest, or agree to invest in the future, at least $100,000 in AB Mutual Funds. 100000 Shareholder Fees (fees paid directly from your investment) 0.0300 0 0 0 0.0100 0 0 0 0 Annual Portfolio Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0045 0.0045 0.0045 0.0025 0.0100 0 0.0005 0.0005 0.0006 0.0001 0.0000 0.0000 0.0008 0.0008 0.0008 0.0014 0.0013 0.0014 0.0084 0.0158 0.0059 -0.0009 -0.0008 -0.0009 0.0075 0.0150 0.0050 For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. September 30, 2027 Examples <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Examples are intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Portfolio for the time periods indicated and then redeem all of your shares at the end of those periods. The Examples also assume that your investment has a 5% return each year, that the Portfolio’s operating expenses stay the same and that any fee waiver and/or expense limitation remains in effect for only the first year. Although your actual costs may be higher or lower, based on these assumptions your costs would be:</div> 374 253 51 551 491 180 743 853 320 1298 1673 729 Portfolio Turnover <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio pays transaction costs, such as commissions, when it buys or sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Portfolio shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Portfolio Operating Expenses or in the Examples, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 16% of the average value of its portfolio.</div> 0.16 PRINCIPAL STRATEGIES: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio pursues its objective by investing principally in high-yielding, predominantly investment grade municipal securities. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. These securities may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers. As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities of New York or municipal securities with interest that is otherwise exempt from New York state income tax.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Adviser selects securities for purchase or sale based on its assessment of the securities’ risk and return characteristics as well as the securities’ impact on the overall risk and return characteristics of the Portfolio. In making this assessment, the Adviser takes into account various factors including the credit quality and sensitivity to interest rates of the securities under consideration and of the Portfolio’s other holdings.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio may also invest in:</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">forward commitments;</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">tender option bonds (“TOBs”);</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">zero‑coupon municipal securities and variable, floating and inverse floating-rate municipal securities;</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">certain types of mortgage-related securities; and</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">derivatives, such as options, futures contracts, forwards and swaps.</div> </td> </tr> </table> As a matter of fundamental policy, the Portfolio invests, under normal circumstances, at least 80% of its net assets in municipal securities that pay interest that is exempt from federal income tax. <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Market Risk:</span> The value of the Portfolio’s assets will fluctuate as the market or markets in which the Portfolio invests fluctuate. The value of the Portfolio’s investments may decline, sometimes rapidly and unpredictably, simply because of economic changes or other local, regional or global events, including public health crises (including the occurrence of a contagious disease or illness), terrorism, war, changing interest rate levels, the imposition of new or additional tariffs, or global conflicts, any of which can affect large portions of the securities markets.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Interest Rate Risk:</span> Changes in interest rates will affect the value of investments in fixed-income securities. When interest rates rise, the value of existing investments in fixed-income securities tends to fall and this decrease in value may not be offset by higher income from new investments. Interest rate risk is generally greater for fixed-income securities with longer maturities or durations. Changing interest rates may have unpredictable effects on the markets, may result in heightened market volatility and may detract from Portfolio performance. In addition, changes in monetary policy may exacerbate the risks associated with changing interest rates.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Duration Risk:</span> Duration is a measure that relates the expected price volatility of a fixed-income security to changes in interest rates. The duration of a fixed-income security may be shorter than or equal to the full maturity of a fixed-income security. Fixed-income securities with longer durations have more risk and will decrease in price as interest rates rise.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Municipal Market Risk:</span> This is the risk that special factors may adversely affect the value of municipal securities and have a significant effect on the yield or value of the Portfolio’s investments in municipal securities. These factors include economic conditions, political or legislative changes, public health crises, uncertainties related to the tax status of municipal securities, and the rights of investors in these securities. To the extent that the Portfolio invests more of its assets in the municipal securities of a particular state or territory, the Portfolio may be vulnerable to events adversely affecting that state or territory. The Portfolio’s investments in New York municipal securities may be vulnerable to events adversely affecting its economy, including public health crises (including the occurrence of a contagious disease or illness). New York’s economy, while diverse, has a relatively large share of the nation’s financial activities. With the financial services sector contributing more than one‑fifth of the state’s wages, the state’s economy is especially vulnerable to adverse events affecting the financial markets such as those that occurred in 2008-2009 and during the COVID‑19 pandemic. In addition, as New York’s financial services and professional and business services sectors serve a global market, they can be highly sensitive to global trends. The Portfolio’s investments in certain municipal securities with principal and interest payments that are made from the revenues of a specific project or facility, and not general tax revenues, may have increased risks. Factors affecting the project or facility, such as local business or economic conditions, could have a significant effect on the project’s ability to make payments of principal and interest on these securities.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; margin-left: 2%; font-size: 10pt; font-family: times new roman;">In addition, changes in tax rates or the treatment of income from certain types of municipal securities, among other things, could negatively affect the municipal securities markets.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; margin-left: 2%; font-size: 10pt; font-family: times new roman;">The municipal securities issued by Puerto Rico and its government agencies and municipalities may have more risks than those of other U.S. issuers of municipal securities. Puerto Rico continues to face a challenging economic and fiscal environment. If the general economic situation in Puerto Rico persists or worsens, the volatility and credit quality of Puerto Rican municipal securities could continue to be adversely affected, and the market for such securities may deteriorate further.</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Inflation Risk:</span> This is the risk that the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio’s assets can decline as can the value of the Portfolio’s distributions. This risk is significantly greater for fixed-income securities with longer maturities.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Credit Risk:</span> An issuer or guarantor of a fixed-income security, or the counterparty to a derivatives or other contract, may be unable or unwilling to make timely payments of interest or principal, or to otherwise honor its obligations. The issuer or guarantor may default, causing a loss of the full principal amount of a security and accrued interest. The degree of risk for a particular security may be reflected in its credit rating. There is the possibility that the credit rating of a fixed-income security may be downgraded after purchase, which may adversely affect the value of the security. Investments in fixed-income securities with lower ratings tend to have a higher probability that an issuer will default or fail to meet its payment obligations.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Tax Risk:</span> There is no guarantee that the income on the Portfolio’s municipal securities will be exempt from regular U.S. federal, and if applicable, state income taxes. From time to time, the U.S. Government and the U.S. Congress consider changes in U.S. federal income tax law that could limit or eliminate the federal tax exemption for municipal bond income, which would in effect reduce the income received by shareholders from the Portfolio by increasing taxes on that income. In such event, the Portfolio’s net asset value (“NAV”) could also decline as yields on municipal bonds, which are typically lower than those on taxable bonds, would be expected to increase to approximately the yield of comparable taxable bonds. Actions or anticipated actions affecting the tax exempt status of municipal bonds could also result in significant shareholder redemptions of Portfolio shares as investors anticipate adverse effects on the Portfolio or seek higher yields to offset the potential loss of the tax deduction. As a result, the Portfolio would be required to maintain higher levels of cash to meet the redemptions, which would negatively affect the Portfolio’s yield.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Illiquid Investments Risk:</span> Illiquid investments risk exists when certain investments are or become difficult to purchase or sell. Difficulty in selling such investments may result in sales at disadvantageous prices affecting the value of your investment in the Portfolio. Causes of illiquid investments risk may include low trading volumes, large positions and heavy redemptions of Portfolio shares. Illiquid investments risk may be higher in a rising interest rate environment, when the value and liquidity of fixed-income securities generally decline. Municipal securities may have more illiquid investments risk than other fixed-income securities because they trade less frequently and the market for municipal securities is generally smaller than many other markets.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Derivatives Risk:</span> Derivatives may be difficult to price or unwind and leveraged so that small changes may produce disproportionate losses for the Portfolio. A short position in a derivative instrument involves the risk of a theoretically unlimited increase in the value of the underlying asset, reference rate or index, which could cause the Portfolio to suffer a potentially unlimited loss. Derivatives, especially over‑the‑counter derivatives, are also subject to counterparty risk, which is the risk that the counterparty (the party on the other side of the transaction) on a derivative transaction will be unable or unwilling to honor its contractual obligations to the Portfolio.</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;"><span style="font-weight: bold;">Management Risk:</span> The Portfolio is subject to management risk because it is an actively-managed investment fund. The Adviser will apply its investment techniques and risk analyses in making investment decisions, but there is no guarantee that its</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 2%;"> </td> <td style="vertical-align: top;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt;">techniques will produce the intended results. Some of these techniques may incorporate, or rely upon, quantitative models, but there is no guarantee that these models will generate accurate forecasts, reduce risk or otherwise perform as expected.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">As with all investments, you may lose money by investing in the Portfolio.</div> BAR CHART AND PERFORMANCE INFORMATION: <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The bar chart and performance information provide an indication of the historical risk of an investment in the Portfolio by showing:</div> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">how the Portfolio’s performance changed from year to year over ten years; and</div> </td> </tr> </table> <table cellpadding="0" cellspacing="0" style="border-collapse: collapse; font-family: times new roman; font-size: 10pt; border-spacing: 0px; width: 100%;"> <tr style="page-break-inside: avoid;"> <td style="width: 1%; vertical-align: top; text-align: left;">•</td> <td style="width: 1%; vertical-align: top;"> </td> <td style="vertical-align: top; text-align: left;"> <div style="margin-top: 0pt; margin-bottom: 0pt; font-family: times new roman; font-size: 10pt; text-align: left;">how the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index.</div> </td> </tr> </table> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">You may obtain updated performance information on the Portfolio’s website at <span style="text-decoration: underline;">www.abfunds.com</span> (click on “Investments—Mutual Funds”).</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.</div> how the Portfolio’s performance changed from year to year over ten years; andhow the Portfolio’s average annual returns for one, five and ten years compare to those of a broad-based securities market index. www.abfunds.com The Portfolio’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future. Bar Chart <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through June 30, 2026, the year‑to‑date unannualized return for Class A shares was 2.78%.</div> The annual returns in the bar chart are for the Portfolio’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. 2026-06-30 year‑to‑date 0.0278 Best Quarter 0.0637 2023-12-31 Worst Quarter -0.0580 2022-03-31 Performance Table Average Annual Total Returns (For the periods ended December 31, 2025) 0.0004 0.0018 0.0167 -0.0002 0.0014 0.0164 0.0129 0.0070 0.0188 0.0140 0.0005 0.0122 0.0353 0.0106 0.0224 0.0425 0.0080 0.0234 After‑tax Returns:–Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; After‑tax Returns:   – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; actual after‑tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and   – Are not relevant to investors who hold Portfolio shares through tax‑deferred arrangements such as 401(k) plans or individual retirement accounts. The Adviser has contractually agreed to waive its management fees and/or to bear certain expenses of the Portfolio to the extent necessary to prevent total Portfolio operating expenses (excluding acquired fund fees and expenses other than the advisory fees of any AB Funds in which the Portfolio may invest, interest expense, and extraordinary expenses), on an annualized basis, from exceeding 0.80%, 1.55%, 0.55% and 0.55% of average daily net assets, respectively, for Class A, Class C, Advisor Class and Class Z shares. In addition to that agreement, in connection with the Portfolio’s investments in AB Government Money Market Portfolio (the “Money Market Portfolio”) (except for the investment of any cash collateral from securities lending), the Adviser has contractually agreed to waive its management fee from the Portfolio and/or reimburse other expenses of the Portfolio in an amount equal to the Portfolio’s pro rata share of the Money Market Portfolio’s effective management fee. Each of the agreements will remain in effect until September 30, 2027 and may only be terminated or changed with the consent of the Portfolio’s Board of Directors. In addition, each of the agreements will be automatically extended for one‑year terms thereafter unless the Adviser provides notice of termination to the Portfolio at least 60 days prior to the end of the period. If interest expense were excluded, Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement would be as follows: Class A Class C Advisor Class Class Z 0.80% 1.55% 0.55% 0.55% If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100. After-tax Returns: – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; – Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Inception date for Class Z shares: 9/28/2018. Performance information for periods prior to the inception of Class Z shares is the performance of the Portfolio’s Class A shares adjusted to reflect the expenses of Class Z shares. For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. “Other Expenses” includes acquired fund fees and expenses totaling less than 0.005%. The Adviser has contractually agreed to waive its management fees and/or to bear certain expenses of the Portfolio to the extent necessary to prevent total Portfolio operating expenses (excluding acquired fund fees and expenses other than the advisory fees of any AB Funds in which the Portfolio may invest, interest expense, and extraordinary expenses), on an annualized basis, from exceeding 0.75%, 1.50% and 0.50% of average daily net assets, respectively, for Class A, Class C and Advisor Class shares. In addition to that agreement, in connection with the Portfolio’s investments in AB Government Money Market Portfolio (the “Money Market Portfolio”) (except for the investment of any cash collateral from securities lending), the Adviser has contractually agreed to waive its management fee from the Portfolio and/or reimburse other expenses of the Portfolio in an amount equal to the Portfolio’s pro rata share of the Money Market Portfolio’s effective management fee. Each of the agreements will remain in effect until September 30, 2027 and may only be terminated or changed with the consent of the Portfolio’s Board of Directors. In addition, each of the agreements will be automatically extended for one‑year terms unless the Adviser provides notice of termination to the Portfolio at least 60 days prior to the end of the period. If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100. “Other Expenses” includes acquired fund fees and expenses totaling less than 0.01%. After-tax Returns: – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; – Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. The Adviser has contractually agreed to waive its management fees and/or to bear certain expenses of the Portfolio to the extent necessary to prevent total Portfolio operating expenses (excluding acquired fund fees and expenses other than the advisory fees of any AB Funds in which the Portfolio may invest, interest expense, and extraordinary expenses), on an annualized basis, from exceeding 0.75%, 1.50% and 0.50% of average daily net assets, respectively, for Class A, Class C and Advisor Class shares. In addition to that agreement, in connection with the Portfolio’s investments in AB Government Money Market Portfolio (the “Money Market Portfolio”) (except for the investment of any cash collateral from securities lending), the Adviser has contractually agreed to waive its management fee from the Portfolio and/or reimburse other expenses of the Portfolio in an amount equal to the Portfolio’s pro rata share of the Money Market Portfolio’s effective management fee. Each of the agreements will remain in effect until September 30, 2027 and may only be terminated or changed with the consent of the Portfolio’s Board of Directors. In addition, each of the agreements will be automatically extended for one‑year terms thereafter unless the Adviser provides notice of termination to the Portfolio at least 60 days prior to the end of the period. For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. “Other Expenses” includes acquired fund fees and expenses totaling less than 0.01%. The Adviser has contractually agreed to waive its management fees and/or to bear certain expenses of the Portfolio to the extent necessary to prevent total Portfolio operating expenses (excluding acquired fund fees and expenses other than the advisory fees of any AB Funds in which the Portfolio may invest, interest expense, and extraordinary expenses), on an annualized basis, from exceeding 0.75%, 1.50% and 0.50% of average daily net assets, respectively, for Class A, Class C and Advisor Class shares. In addition to that agreement, in connection with the Portfolio’s investments in AB Government Money Market Portfolio (the “Money Market Portfolio”) (except for the investment of any cash collateral from securities lending), the Adviser has contractually agreed to waive its management fee from the Portfolio and/or reimburse other expenses of the Portfolio in an amount equal to the Portfolio’s pro rata share of the Money Market Portfolio’s effective management fee. Each of the agreements will remain in effect until September 30, 2027 and may only be terminated or changed with the consent of the Portfolio’s Board of Directors. In addition, each agreement will be automatically extended for one‑year terms unless the Adviser provides notice of termination to the Portfolio at least 60 days prior to the end of the period. If interest expense were excluded, Total Annual Portfolio Operating Expenses After Fee Waiver and/or Expense Reimbursement would be as follows: Class A Class C Advisor Class 0.75% 1.50% 0.50% If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100. After-tax Returns: – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; – Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100. After-tax Returns: – Are shown for Class A shares only and will vary for the other Classes of shares because these Classes have different expense ratios; – Are an estimate, which is based on the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes; actual after-tax returns depend on an individual investor’s tax situation and are likely to differ from those shown; and – Are not relevant to investors who hold Portfolio shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. For Class C shares, the contingent deferred sales charge, or CDSC, is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. “Other Expenses” includes acquired fund fees and expenses totaling less than 0.01%.