0000019614 absmf:S000010117Member absmf:CapitalizationRiskMember 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:ForeignNonUSRiskMember 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:ManagementRiskMember 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:MarketRisksMember 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member oef:RiskLoseMoneyMember 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:SectorRiskMember 2026-06-30 2026-06-30 0000019614 2026-06-30 2026-06-30 0000019614 absmf:C000028067Member 2021-01-01 2025-12-31 0000019614 absmf:C000028067Member oef:AfterTaxesOnDistributionsAndSalesMember 2021-01-01 2025-12-31 0000019614 absmf:C000028067Member oef:AfterTaxesOnDistributionsMember 2021-01-01 2025-12-31 0000019614 absmf:C000028069Member 2021-01-01 2025-12-31 0000019614 absmf:C000028070Member 2021-01-01 2025-12-31 0000019614 absmf:C000028073Member 2021-01-01 2025-12-31 0000019614 absmf:C000144785Member 2021-01-01 2025-12-31 0000019614 absmf:Russell2500GrowthIndexMember 2021-01-01 2025-12-31 0000019614 absmf:SAndP500IndexMember 2021-01-01 2025-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2016-01-01 2016-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2017-01-01 2017-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2018-01-01 2018-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2019-01-01 2019-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2020-01-01 2020-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2021-01-01 2021-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2022-01-01 2022-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2023-01-01 2023-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2024-01-01 2024-12-31 0000019614 absmf:C000028067Member 2025-01-01 2025-12-31 0000019614 absmf:C000028067Member oef:AfterTaxesOnDistributionsAndSalesMember 2025-01-01 2025-12-31 0000019614 absmf:C000028067Member oef:AfterTaxesOnDistributionsMember 2025-01-01 2025-12-31 0000019614 absmf:C000028069Member 2025-01-01 2025-12-31 0000019614 absmf:C000028070Member 2025-01-01 2025-12-31 0000019614 absmf:C000028073Member 2025-01-01 2025-12-31 0000019614 absmf:C000144785Member 2025-01-01 2025-12-31 0000019614 absmf:Russell2500GrowthIndexMember 2025-01-01 2025-12-31 0000019614 absmf:S000010117Member absmf:C000028067Member 2025-01-01 2025-12-31 0000019614 absmf:SAndP500IndexMember 2025-01-01 2025-12-31 0000019614 absmf:S000010117Member 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:C000028067Member 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:C000028069Member 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:C000028070Member 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:C000028073Member 2026-06-30 2026-06-30 0000019614 absmf:S000010117Member absmf:C000144785Member 2026-06-30 2026-06-30 0000019614 absmf:C000028067Member 2016-01-01 2025-12-31 0000019614 absmf:C000028067Member oef:AfterTaxesOnDistributionsAndSalesMember 2016-01-01 2025-12-31 0000019614 absmf:C000028067Member oef:AfterTaxesOnDistributionsMember 2016-01-01 2025-12-31 0000019614 absmf:C000028069Member 2016-01-01 2025-12-31 0000019614 absmf:C000028070Member 2016-01-01 2025-12-31 0000019614 absmf:C000028073Member 2016-01-01 2025-12-31 0000019614 absmf:C000144785Member 2016-01-01 2025-12-31 0000019614 absmf:Russell2500GrowthIndexMember 2016-01-01 2025-12-31 0000019614 absmf:SAndP500IndexMember 2016-01-01 2025-12-31 iso4217:USD pure 0000019614 false 485BPOS 2026-06-30 0.1082 0.1736 0.3251 0.5251 -0.0447 0.3043 0.1872 0.0478 -0.3611 0.0670 Calendar Year End (%) During the period shown in the bar chart, the Fund’s: Best Quarter was up 36.18%, 2nd quarter 2020; and Worst Quarter was down -24.14%, 2nd quarter, 2022. N-1A AB DISCOVERY GROWTH FUND, INC. 2026-10-30 AB Discovery Growth 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) 0.0061 0.0061 0.0061 0.0061 0.0061 0.0023 0.0100 0 0 0 0.0006 0.0006 0.0006 0.0012 0.0003 0.0002 0.0002 0.0002 0.0002 0.0002 0.0008 0.0008 0.0008 0.0014 0.0005 0.0001 0.0001 0.0001 0.0001 0.0001 0.0093 0.0170 0.0070 0.0076 0.0067 -0.0001 -0.0001 -0.0001 -0.0001 -0.0001 0.0092 0.0169 0.0069 0.0075 0.0066 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 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> 515 272 70 77 67 708 535 223 242 213 917 922 389 421 372 1519 1803 870 941 834 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 period, the Fund’s portfolio turnover rate was 110% of the average value of its portfolio.</div> 1.10 PRINCIPAL STRATEGIES <div style="margin-top: 0pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund invests primarily in a diversified portfolio of equity securities with relatively smaller capitalizations as compared to the overall U.S. market. The Fund invests, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of small- and mid‑capitalization companies meeting the Adviser’s growth criteria. For purposes of this policy, companies meeting the Adviser’s growth criteria are those companies with securities included in any one of the following indexes: the MSCI ACWI IMI Growth, the Russell 3000<sup style="font-size: 75%; vertical-align: top;">®</sup> Growth Index, and the Morningstar Global All‑Cap Growth TME. Also, for purposes of this policy, small- and mid‑capitalization companies are those companies falling within the lowest 25% of the total U.S. equity market capitalization (excluding, for purposes of this calculation, companies with market capitalizations of less than $10 million). As of June 30, 2026, there were approximately 3,109 companies within the lowest 25% of the total U.S. equity market capitalization (excluding companies with market capitalizations of less than $10 million) with market capitalizations ranging from $10 million to $69.7 billion. Because the Fund’s definition of small- and mid‑capitalization companies is dynamic, the limits on market capitalization will change with the markets.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund may invest in any company and industry and in any type of equity security with potential for capital appreciation. It invests in well-known and established companies and in new and less-seasoned companies. The Fund’s investment policies emphasize investments in companies that are demonstrating improving financial results and a favorable earnings outlook. The Fund may invest in foreign securities.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">When selecting securities, the Adviser typically seeks companies that have strong, experienced management teams, strong market positions, and the potential to support greater than expected earnings growth rates. In making specific investment decisions for the Fund, the Adviser combines fundamental and quantitative analysis in its stock selection process.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund invests principally in equity securities but may also invest in other types of securities. The Fund, at times, invests in shares of exchange-traded funds (“ETFs”) in lieu of making direct investments in securities. ETFs may provide more efficient and economical exposure to the types of companies and geographic locations in which the Fund seeks to invest than direct investments. The Fund may also invest up to 20% of its total assets in rights and warrants.</div> <div style="margin-top: 6pt; margin-bottom: 0pt; font-size: 10pt; font-family: times new roman;">The Fund may enter into derivatives transactions, such as options, futures contracts, forwards and swaps to manage risk and to seek to generate additional returns. 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 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> The Fund invests, under normal circumstances, at least 80% of its net assets (plus any borrowings for investment purposes) in equity securities of small- and mid‑capitalization companies meeting the Adviser’s growth criteria. For purposes of this policy, companies meeting the Adviser’s growth criteria are those companies with securities included in any one of the following indexes: the MSCI ACWI IMI Growth, the Russell 3000<sup style="font-size: 75%; vertical-align: top;">®</sup> Growth Index, and the Morningstar Global All‑Cap Growth TME. Also, for purposes of this policy, small- and mid‑capitalization companies are those companies falling within the lowest 25% of the total U.S. equity market capitalization (excluding, for purposes of this calculation, companies with market capitalizations of less than $10 million). As of June 30, 2026, there were approximately 3,109 companies within the lowest 25% of the total U.S. equity market capitalization (excluding companies with market capitalizations of less than $10 million) with market capitalizations ranging from $10 million to $69.7 billion. Because the Fund’s definition of small- and mid‑capitalization companies is dynamic, the limits on market capitalization will change with the markets. For purposes of this policy, companies meeting the Adviser’s growth criteria are those companies with securities included in any one of the following indexes: the MSCI ACWI IMI Growth, the Russell 3000<sup style="font-size: 75%; vertical-align: top;">®</sup> Growth Index, and the Morningstar Global All‑Cap Growth TME. <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;">Sector Risk: </span>The Fund may have more risk because it may invest to a significant extent in one or more particular market sectors, such as the industrials or information technology sector. To the extent it does so, market or economic factors affecting the relevant sector(s) could have a major effect on the value of the Fund’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;">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;">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;">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 and an additional index that more closely reflects the types of securities in which the Fund invests.</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: 12pt; 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> 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 and an additional index that more closely reflects the types of securities in which the Fund invests. 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 4.44%.</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 0.0444 Best Quarter 0.3618 2020-06-30 Worst Quarter -0.2414 2022-06-30 Performance Table* Average Annual Total Returns (For the periods ended December 31, 2025) 0.0218 0.0016 0.1028 -0.0046 -0.0114 0.0841 0.0298 0.0008 0.0811 0.0494 0.0023 0.0989 0.0688 0.0126 0.1101 0.0678 0.0119 0.1097 0.0687 0.0128 0.1106 0.1788 0.1442 0.1482 0.1031 0.0298 0.1055 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. 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. The agreement may only be terminated or changed with the consent of the Fund’s Board of Directors. If you did not redeem your shares at the end of the period, your expenses would be decreased by approximately $100. Includes the impact of proceeds received and credited to the Fund resulting from class action settlements, which enhanced the Fund’s performance for the year ended July 31, 2025 by 0.07%. 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.