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N-1A 2026-10-30 AB Sustainable International Thematic Fund INVESTMENT OBJECTIVE <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund’s investment objective is long-term growth of capital.</div> FEES AND EXPENSES OF THE FUND <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 Fund. <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 Funds—Sales Charge Reduction Programs for Class A Shares on page 132 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 199 of the Fund’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) 0.0425 0 0 0 0 0 0.0100 0 0 0 0 0 0 0 0 Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) 0.0065 0.0065 0.0065 0.0065 0.0065 0.0025 0.0100 0 0 0 0.0005 0.0006 0.0005 0.0011 0.0002 0.0009 0.0009 0.0008 0.0009 0.0010 0.0014 0.0015 0.0013 0.0020 0.0012 0.0001 0.0001 0.0001 0.0001 0.0001 0.0105 0.0181 0.0079 0.0086 0.0078 -0.0001 -0.0001 0.0000 -0.0001 -0.0001 0.0104 0.0180 0.0079 0.0085 0.0077 Purchases of Class A shares in amounts of $1,000,000 or more, or by certain group retirement plans, may be subject to a 1%, 1‑year contingent deferred sales charge, or CDSC, which may be subject to waiver in certain circumstances.For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. 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 Fund with the cost of investing in other mutual funds. The Examples assume that you invest $10,000 in the Fund 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 Fund’s operating expenses</div> <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">stay the same and that any fee waiver and/or expense limitation is 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> 527 283 81 87 79 744 568 252 273 248 979 979 439 476 432 1652 1926 978 1060 965 Portfolio Turnover <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund 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 Fund shares are held in a taxable account. These transaction costs, which are not reflected in the Annual Fund Operating Expenses or in the Examples, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 113% of the average value of its portfolio.</div> 1.13 PRINCIPAL STRATEGIES <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund invests primarily in a focused international portfolio of equity securities of companies whose business activities the Adviser believes position the company to benefit from certain sustainable investment themes that align with one or more of the United Nations Sustainable Development Goals (“SDGs”). These themes include the advancement of climate, health and empowerment. Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities of issuers located outside of the United States that satisfy the Fund’s sustainability criteria. An issuer that derives at least 25% of its total revenues from activities consistent with the achievement of the SDGs meets such criteria, although many of the issuers in which the Fund invests will derive a much greater portion of their revenues from such activities.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Adviser employs a combination of “top‑down” and “bottom‑up” investment processes with the goal of identifying, based on its internal research and analysis, securities of companies worldwide, that fit into sustainable investment themes. First, the Adviser identifies through its “top‑down” process the sustainable investment themes. In addition to this “top‑down” thematic approach, the Adviser then uses a “bottom‑up” analysis of individual companies, focusing on prospective earnings growth, valuation, and quality of company management and on evaluating a company’s exposure to environmental, social and corporate governance (“ESG”) factors. ESG factors, which can vary across companies and industries, may include environmental impact, corporate governance, ethical business practices, employee practices, product safety, supply chain management and community impact. Eligible investments include securities of issuers that the Adviser believes will maximize total return while also contributing to positive societal impact aligned with one or more SDGs. While the Adviser emphasizes company-specific positive selection criteria over broad-based negative screens in assessing a company’s exposure to ESG factors, the Fund will not invest in companies that derive revenue from direct involvement in adult entertainment, alcohol, cannabis, coal, controversial weapons, firearms, gambling, genetically modified organisms, military contracting, prisons, or tobacco. Activities deriving revenue and revenue thresholds may vary by sector.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Adviser normally considers a large universe of mid‑ to large-capitalization companies worldwide for investment, but may invest in companies of any size. The Fund invests, under normal circumstances, in the equity securities of companies located in at least three countries (and normally substantially more) other than the United States. The Fund invests in securities of companies in both developed and emerging market countries, with the stock selection process determining the geographic distribution of the Fund’s investments. The Fund also invests in the equity securities of companies located in the United States with exposure to international markets. The Fund may sell securities that no longer meet the investment criteria described above.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">Currencies can have a dramatic impact on equity returns, significantly adding to returns in some years and greatly diminishing them in others. Currency and equity positions are evaluated separately. The Adviser may seek to hedge the currency exposure resulting from securities positions when it finds the currency exposure unattractive. To hedge all or a portion of its currency risk, the Fund may, from time to time, invest in currency-related derivatives, including forward currency exchange contracts, futures contracts, options on futures contracts, swaps and options. The Adviser may also seek investment opportunities by taking long or short positions in currencies through the use of currency-related derivatives.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund may enter into other derivatives transactions, such as options, futures contracts, forwards, and swaps. The Fund may use options strategies involving the purchase and/or writing of various combinations of call and/or put options, including on individual securities and stock indices, futures contracts (including futures contracts on individual securities and stock indices) or shares of exchange-traded funds (“ETFs”). These transactions may be used, for example, in an effort to earn extra income, to adjust exposure to individual securities or markets, or to protect all or a portion of the Fund’s portfolio from a decline in value, sometimes within certain ranges.</div> Under normal circumstances, the Fund invests at least 80% of its net assets in equity securities of issuers located outside of the United States that satisfy the Fund’s sustainability criteria. <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 Fund’s assets will fluctuate as the market or markets in which the Fund invests fluctuate. The value of the Fund’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. It includes the risk that a particular style of investing may be underperforming the market generally.</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;">Focused Portfolio Risk:</span> Investments in a limited number of companies may have more risk because changes in the value of a single security may have a more significant effect, either negative or positive, on the Fund’s net asset value, or NAV.</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;">ESG Risk:</span> Applying ESG and sustainability criteria to the investment process may exclude securities of certain issuers and, therefore, the Fund may forgo some market opportunities available to funds that do not use ESG or sustainability criteria. Securities of companies with ESG practices may shift into and out of favor depending on market and economic conditions, and the Fund’s performance may at times be better or worse than the performance of funds that do not use ESG or sustainability criteria. Furthermore, ESG and sustainability criteria are not uniformly defined, and the Fund’s ESG and sustainability criteria may differ from those used by other funds. In addition, in evaluating an investment, the Adviser is dependent upon information and data that may be incomplete, inaccurate or unavailable, which could adversely affect the analysis of the ESG and sustainability factors relevant to a particular investment.</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;">Foreign (Non‑U.S.) Risk:</span> Investments in securities of non‑U.S. issuers may involve more risk than those of U.S. issuers. These securities may fluctuate more widely in price and may be more difficult to trade due to adverse market, economic, political, regulatory or other factors.</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;">Emerging Market Risk:</span> Investments in emerging market countries may have more risks than investments in other foreign countries because the markets are less developed, less liquid and are subject to increased potential for market manipulation and increased economic, political, regulatory or other uncertainties.</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;">Currency Risk:</span> Fluctuations in currency exchange rates may negatively affect the value of the Fund’s investments or reduce its returns.</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;">Capitalization Risk:</span> Investments in small- and mid‑capitalization companies may be more volatile than investments in large-capitalization companies. Investments in small-capitalization companies may have additional risks because these companies have limited product lines, markets or financial resources.</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 Fund. 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 Fund 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 Fund.</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 Fund 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 for the Fund, 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 Fund.</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 Fund 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 Fund’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 Fund’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 Fund’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 Fund’s past performance before and after taxes, of course, does not necessarily indicate how it will perform in the future.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman; font-weight: bold;">On January 8, 2018, the Fund implemented its current investment strategies (previously, the Fund’s investment strategies did not emphasize sustainable investment themes) and also changed its name from AB International Growth Fund to AB Sustainable International Thematic Fund. Accordingly, the performance shown below for periods prior to January 8, 2018 is based on the Fund’s prior investment strategies and may not be representative of the Fund’s performance under its current investment strategies.</div> how the Fund’s performance changed from year to year over ten years; andhow the Fund’s average annual returns for one, five and ten years compare to those of a broad-based securities market index. www.abfunds.com The Fund’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 Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. Through September 30, 2026, the year‑to‑date unannualized return for Class A shares was 1.96%.</div> The annual returns in the bar chart are for the Fund’s Class A shares and do not reflect sales loads. If sales loads were reflected, returns would be less than those shown. 2026-09-30 year‑to‑date 0.0196 Best Quarter 0.2299 2020-06-30 Worst Quarter -0.1842 2020-03-31 Performance TableAverage Annual Total Returns (For the periods ended December 31, 2025) 0.0873 -0.0061 0.0511 0.0873 -0.0091 0.0455 0.0517 -0.0046 0.0397 0.1169 -0.0051 0.0476 0.1388 0.0051 0.0583 0.1372 0.0045 0.0583 0.1387 0.0053 0.0588 0.3239 0.0791 0.0841 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 Fund shares through tax‑deferred arrangements such as 401(k) plans or individual retirement accounts. 2021-07-26 Purchases of Class A shares in amounts of $1,000,000 or more, or by certain group retirement plans, may be subject to a 1%, 1‑year contingent deferred sales charge, or CDSC, which may be subject to waiver in certain circumstances. For Class C shares, the CDSC is 0% after the first year. Class C shares automatically convert to Class A shares after eight years. In connection with the Fund’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 Fund and/or reimburse other expenses of the Fund in an amount equal to the Fund’s pro rata share of the Money Market Portfolio’s effective management fee, as included in “Acquired Fund Fees and Expenses”. The agreement may only be terminated or changed with the consent of the Fund’s Board of Directors. Amount is less than 0.005%. 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 Fund shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts. Inception date for Class Z shares: 7/26/21. Performance information for periods prior to the inception of Class Z shares is the performance of the Fund’s Class A shares adjusted to reflect the expenses of the Class Z shares.