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2026-04-01 Dividend Growth Fund INVESTMENT OBJECTIVE The Fund’s investment objective is to seek current income and capital appreciation. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 61 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in the Lord Abbett Family of Funds. 50000 Shareholder Fees (Fees paid directly from your investment) 0.0575 0 0 0 0 0 0 0 0 0 0 0 0.0100 0 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) 0.0052 0.0052 0.0052 0.0052 0.0052 0.0052 0.0025 0.0100 0.0010 0 0 0.0045 0.0012 0.0012 0.0012 0.0007 0.0012 0.0012 0.0089 0.0164 0.0074 0.0059 0.0064 0.0109 0 0 -0.0010 0 0 0 0.0089 0.0164 0.0064 0.0059 0.0064 0.0109 0.0052 0.0052 0.0052 0.0052 0.0052 0.0060 0.0050 0.0025 0 0 0.0012 0.0012 0.0012 0.0012 0.0007 0.0124 0.0114 0.0089 0.0064 0.0059 0 0 0 0 0 0.0124 0.0114 0.0089 0.0064 0.0059 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 661 843 1040 1608 661 843 1040 1608 267 517 892 1743 167 517 892 1743 65 226 402 909 65 226 402 909 60 189 329 738 60 189 329 738 65 205 357 798 65 205 357 798 111 347 601 1329 111 347 601 1329 126 393 681 1500 126 393 681 1500 116 362 628 1386 116 362 628 1386 91 284 493 1096 91 284 493 1096 65 205 357 798 65 205 357 798 60 189 329 738 60 189 329 738 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and 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 costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 30% of the average value of its portfolio. 0.30 PRINCIPAL INVESTMENT STRATEGIES The Fund invests in equity securities of large and mid-sized companies that the Fund’s portfolio management team believes have potential for long-term total return and consistent increases in their dividends over time resulting from their earnings growth. In particular, the Fund focuses on large and mid-sized companies that have a ten-year history of dividend issuance and growth, which represents a narrow investable universe. The Fund may invest in companies of any size, but expects to invest in companies having a market capitalization at the time of purchase of at least $500 million.Equity securities in which the Fund may invest include common stocks, preferred stocks, equity interests in trusts (including real estate investment trusts (“REITs”) and privately offered trusts), partnerships, joint ventures, limited liability companies and vehicles with similar legal structures, other instruments convertible or exercisable into the foregoing, and other investments with similar economic characteristics. The Fund may invest up to 20% of its net assets in securities of foreign companies, including emerging market companies, American Depositary Receipts (“ADRs”), Global Depository Receipts (“GDRs”), and other similar depositary receipts. In addition to ADRs, the Fund generally defines foreign companies as those whose securities are traded primarily on non-U.S. securities exchanges. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment, or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Investment Strategy Risk: If the Fund’s fundamental research and quantitative analysis fail to produce the intended result, the Fund may suffer losses or underperform its benchmark index or other funds with the same investment objective or strategies, even in a favorable market. In addition, the Fund’s strategy of focusing on dividend-paying companies means the Fund will be more exposed to risks associated with that particular market segment than a fund that invests more widely. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Equity Securities Risk: Equity securities, as well as equity-like securities such as convertible debt securities, may experience significant volatility. Such securities may fall sharply in response to adverse events affecting overall markets, a particular industry or sector, or an individual company’s financial condition. · Dividend Risk: Securities of dividend-paying companies that meet the Fund’s investment criteria may not be widely available, limiting the Fund’s ability to produce current income and increasing the volatility of the Fund’s returns. At times, the performance of dividend-paying companies may lag the performance of other companies or the broader market as a whole. In addition, the dividend payments of the Fund’s portfolio companies may vary over time, and there is no guarantee that a company will pay a dividend at all. · Industry and Sector Risk: Although the Fund does not employ an industry or sector focus, its exposure to specific industries or sectors will increase from time to time based on the portfolio management team’s perception of investment opportunities. If the Fund is overweight in a single industry or sector relative to its benchmark index, the Fund will face an increased risk that the value of its portfolio will decrease because of events disproportionately affecting that industry or sector. Furthermore, investments in particular industries or sectors may be more volatile than the broader market as a whole. · Large Company Risk: Larger, more established companies may be less able to respond quickly to certain market developments. In addition, larger companies may have slower rates of growth as compared to successful, but less well-established, smaller companies. · Mid-Sized Company Risk: Investments in mid-sized companies may involve greater risks than investments in larger, more established companies. Securities of mid-sized companies tend to be more sensitive to changing economic, market, and industry conditions and tend to be more volatile and less liquid than equity securities of larger companies, especially over the short term. The securities of mid-sized companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the ability to sell these securities in the future. · Value Investing Risk: The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth. Value investing also is subject to the risk that a company judged to be undervalued may actually be appropriately priced or even overpriced. · Growth Investing Risk: Growth stocks typically trade at higher multiples of current earnings as compared to other stocks, which may lead to inflated prices. Growth stocks often are more sensitive to market fluctuations than other securities because their market prices are highly sensitive to future earnings expectations. At times when it appears that these expectations may not be met, prices of growth stocks typically fall. Growth stocks may be more volatile than securities of slower-growing issuers. · Foreign and Emerging Market Company Risk: Investments in foreign companies and in U.S. companies with economic ties to foreign markets generally involve special risks. These companies may be more vulnerable to economic, political, and social instability and subject to less government supervision, lack of transparency, inadequate regulatory and accounting standards, and foreign taxes. Foreign company securities also include ADRs, which may be less liquid than the underlying shares in their primary trading market. Foreign securities also may subject the Fund’s investments to changes in currency exchange rates. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks. Investments in emerging markets may be considered speculative and generally are riskier than investments in more developed markets. Emerging markets are more likely to experience hyperinflation and currency devaluations. Securities of emerging market companies may have far lower trading volumes and less liquidity than securities of issuers in developed markets. In certain emerging market countries, governments participate to a significant degree in their respective economies. Action by these governments could have a significant adverse effect on market prices of securities and payment of dividends. Companies with economic ties to emerging markets may be susceptible to the same risks as companies organized in emerging markets. · Foreign Currency Risk: Investments in securities that are denominated or receiving revenues in foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar, or, in the case of hedged positions, that the U.S. dollar will decline in value relative to the currency being hedged. Foreign currency exchange rates may fluctuate significantly over short periods of time. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 2nd Q 2020 +19.16% Worst Quarter 1st Q 2020 -19.86% Best Quarter 2020-06-30 0.1916 Worst Quarter 2020-03-31 -0.1986 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund. The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0950 0.1111 0.1245 0.0822 0.0981 0.1083 0.0651 0.0860 0.0978 0.1431 0.1159 0.1227 0.1643 0.1272 0.1339 0.1649 0.1278 0.1313 2017-04-04 0.1642 0.1271 0.1340 0.1589 0.1221 0.1289 0.1577 0.1204 0.1272 0.1587 0.1214 0.1285 0.1615 0.1244 0.1313 0.1643 0.1271 0.1341 0.1650 0.1277 0.1349 S&P 500® Index 0.1788 0.1442 0.1482 0.1486 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Growth Opportunities Fund INVESTMENT OBJECTIVE The Fund’s investment objective is capital appreciation. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 61 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in the Lord Abbett Family of Funds. 50000 Shareholder Fees (Fees paid directly from your investment) 0.0575 0 0 0 0 0 0 0 0 0 0 0 0.0100 0 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 0.0065 0.0025 0.0100 0.0010 0 0 0.0045 0.0021 0.0021 0.0021 0.0012 0.0021 0.0021 0.0111 0.0186 0.0096 0.0077 0.0086 0.0131 -0.0015 -0.0015 -0.0015 -0.0015 -0.0015 -0.0015 0.0096 0.0171 0.0081 0.0062 0.0071 0.0116 0.0065 0.0065 0.0065 0.0065 0.0065 0.0060 0.0050 0.0025 0 0 0.0021 0.0021 0.0021 0.0021 0.0012 0.0146 0.0136 0.0111 0.0086 0.0077 -0.0015 -0.0015 -0.0015 -0.0015 -0.0015 0.0131 0.0121 0.0096 0.0071 0.0062 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same, giving effect to the fee waiver and expense reimbursement arrangement described above. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 667 894 1138 1836 667 894 1138 1836 274 570 992 1971 174 570 992 1971 83 291 516 1164 83 291 516 1164 63 231 413 940 63 231 413 940 73 259 462 1047 73 259 462 1047 118 400 704 1566 118 400 704 1566 133 447 783 1733 133 447 783 1733 123 416 730 1622 123 416 730 1622 98 338 597 1338 98 338 597 1338 73 259 462 1047 73 259 462 1047 63 231 413 940 63 231 413 940 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and 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 costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 100% of the average value of its portfolio. 1 PRINCIPAL INVESTMENT STRATEGIES The Fund invests in equity securities of mid-sized companies that the portfolio management team believes demonstrate above-average, long-term growth potential. Under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of mid-sized companies. A mid-sized company is defined as a company having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell Midcap® Index. The portfolio management team seeks to invest in the stocks of companies with strong business models, management, and competitive positions that are targeting markets that appear most likely to benefit from increased innovation. The team believes these companies possess revenue and earnings growth potential that can exceed market expectations.Equity securities in which the Fund may invest include common stocks, preferred stocks, equity interests in trusts (including real estate investment trusts (“REITs”) and privately offered trusts), partnerships, joint ventures, limited liability companies and vehicles with similar legal structures, other instruments convertible or exercisable into the foregoing, and other investments with similar economic characteristics.The Fund may invest up to 20% of its net assets in securities of foreign companies, including emerging market companies, American Depositary Receipts (“ADRs”), Global Depository Receipts (“GDRs”), and other similar depositary receipts. In addition to ADRs, the Fund generally defines foreign companies as those whose securities are traded primarily on non-U.S. securities exchanges.The Fund may engage in active and frequent trading of its portfolio securities.The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment, or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · High Portfolio Turnover Risk: High portfolio turnover may result in increased transaction costs, reduced investment performance, and higher taxes resulting from increased realized capital gains, including short-term capital gains taxable as ordinary income when distributed to shareholders. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Equity Securities Risk: Equity securities, as well as equity-like securities such as convertible debt securities, may experience significant volatility. Such securities may fall sharply in response to adverse events affecting overall markets, a particular industry or sector, or an individual company’s financial condition. · Industry and Sector Risk: Although the Fund does not employ an industry or sector focus, its exposure to specific industries or sectors will increase from time to time based on the portfolio management team’s perception of investment opportunities. If the Fund is overweight in a single industry or sector relative to its benchmark index, the Fund will face an increased risk that the value of its portfolio will decrease because of events disproportionately affecting that industry or sector. Furthermore, investments in particular industries or sectors may be more volatile than the broader market as a whole. · Mid-Sized Company Risk: Investments in mid-sized companies may involve greater risks than investments in larger, more established companies. Securities of mid-sized companies tend to be more sensitive to changing economic, market, and industry conditions and tend to be more volatile and less liquid than equity securities of larger companies, especially over the short term. The securities of mid-sized companies tend to trade less frequently than those of larger, more established companies, which can adversely affect the pricing of these securities and the ability to sell these securities in the future. · Growth Investing Risk: Growth stocks typically trade at higher multiples of current earnings as compared to other stocks, which may lead to inflated prices. Growth stocks often are more sensitive to market fluctuations than other securities because their market prices are highly sensitive to future earnings expectations. At times when it appears that these expectations may not be met, prices of growth stocks typically fall. Growth stocks may be more volatile than securities of slower-growing issuers. · Foreign and Emerging Market Company Risk: Investments in foreign companies and in U.S. companies with economic ties to foreign markets generally involve special risks. These companies may be more vulnerable to economic, political, and social instability and subject to less government supervision, lack of transparency, inadequate regulatory and accounting standards, and foreign taxes. Foreign company securities also include ADRs, which may be less liquid than the underlying shares in their primary trading market. Foreign securities also may subject the Fund’s investments to changes in currency exchange rates. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks. Investments in emerging markets may be considered speculative and generally are riskier than investments in more developed markets. Emerging markets are more likely to experience hyperinflation and currency devaluations. Securities of emerging market companies may have far lower trading volumes and less liquidity than securities of issuers in developed markets. In certain emerging market countries, governments participate to a significant degree in their respective economies. Action by these governments could have a significant adverse effect on market prices of securities and payment of dividends. Companies with economic ties to emerging markets may be susceptible to the same risks as companies organized in emerging markets. · Foreign Currency Risk: Investments in securities that are denominated or receiving revenues in foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar, or, in the case of hedged positions, that the U.S. dollar will decline in value relative to the currency being hedged. Foreign currency exchange rates may fluctuate significantly over short periods of time. · Real Estate Risk: An investment in a REIT generally is subject to the risks that impact the value of the underlying properties or mortgages of the REIT. These risks include loss to casualty or condemnation, and changes in supply and demand, interest rates, zoning laws, regulatory limitations on rents, property taxes, and operating expenses. Other factors that may adversely affect REITs include poor performance by management of the REIT, changes to the tax laws, or failure by the REIT to qualify for favorable tax treatment under the Internal Revenue Code of 1986, as amended (the “Code”), and changes in local, regional, or general economic conditions. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 2nd Q 2020 +31.78% Worst Quarter 1st Q 2020 -19.38% Best Quarter 2020-06-30 0.3178 Worst Quarter 2020-03-31 -0.1938 The table below shows how the Fund’s average annual total returns compare to the returns of securities market indices with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the S&P 500® Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) 0.0674 0.0213 0.0983 0.0494 0.0093 0.0816 0.0526 0.0152 0.0765 0.1144 0.0258 0.0965 0.1346 0.0350 0.1064 0.1368 0.0370 0.1155 2017-04-04 0.1357 0.0361 0.1076 0.1307 0.0315 0.1026 0.1286 0.0299 0.1010 0.1299 0.0310 0.1021 0.1327 0.0336 0.1048 0.1354 0.0362 0.1077 0.1369 0.0370 0.1085 Russell Midcap® Growth Index 0.0866 0.0665 0.1249 0.1278 2017-04-04 (reflects no deduction for fees, expenses, or taxes) Russell Midcap® Index 0.1060 0.0867 0.1101 0.1049 2017-04-04 S&P 500® Index 0.1788 0.1442 0.1482 0.1486 2017-04-04 Small Cap Value Fund INVESTMENT OBJECTIVE The Fund’s investment objective is long-term capital appreciation. FEES AND EXPENSES This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial intermediary and in “Sales Charge Reductions and Waivers” on page 61 of the prospectus, Appendix A to the prospectus, titled “Intermediary-Specific Sales Charge Reductions and Waivers,” and “Purchases, Redemptions, Pricing, and Payments to Dealers” on page 9-1 of Part II of the statement of additional information (“SAI”). You may qualify for sales charge discounts if you and certain members of your family invest, or agree to invest in the future, at least $50,000 in the Lord Abbett Family of Funds. 50000 Shareholder Fees (Fees paid directly from your investment) 0.0575 0 0 0 0 0 0 0 0 0 0 0 0.0100 0 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) 0.0075 0.0075 0.0075 0.0075 0.0075 0.0075 0.0025 0.0100 0.0010 0 0 0.0045 0.0021 0.0021 0.0021 0.0014 0.0021 0.0021 0.0121 0.0196 0.0106 0.0089 0.0096 0.0141 0.0075 0.0075 0.0075 0.0075 0.0075 0.0060 0.0050 0.0025 0 0 0.0021 0.0021 0.0021 0.0021 0.0014 0.0156 0.0146 0.0121 0.0096 0.0089 Example This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Class C shares automatically convert to Class A shares after eight years. The expense example for Class C shares for the ten-year period reflects the conversion to Class A shares. Although your actual costs may be higher or lower, based on these assumptions your costs would be: If Shares Are Redeemed If Shares Are Not Redeemed 691 937 1202 1957 691 937 1202 1957 299 615 1057 2091 199 615 1057 2091 108 337 585 1294 108 337 585 1294 91 284 493 1096 91 284 493 1096 98 306 531 1178 98 306 531 1178 144 446 771 1691 144 446 771 1691 159 493 850 1856 159 493 850 1856 149 462 797 1746 149 462 797 1746 123 384 665 1466 123 384 665 1466 98 306 531 1178 98 306 531 1178 91 284 493 1096 91 284 493 1096 Portfolio Turnover The Fund pays transaction costs, such as commissions, when it buys and 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 costs, which are not reflected in the annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 69% of the average value of its portfolio. 0.69 PRINCIPAL INVESTMENT STRATEGIES The Fund invests in equity securities of small companies that the portfolio management team believes are undervalued by the market and are selling at reasonable prices in relation to the portfolio management team’s assessment of their potential or intrinsic value. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of small companies. A small company is defined as a company having a market capitalization at the time of purchase that falls within the market capitalization range of companies in the Russell 2000® Index. Equity securities in which the Fund may invest include common stocks, preferred stocks, equity interests in trusts (including real estate investment trusts (“REITs”) and privately offered trusts), partnerships, joint ventures, limited liability companies and vehicles with similar legal structures, other instruments convertible or exercisable into the foregoing, and other investments with similar economic characteristics. The Fund may invest up to 20% of its net assets in securities of foreign companies, including emerging market companies, American Depositary Receipts (“ADRs”), Global Depository Receipts (“GDRs”), and other similar depositary receipts. In addition to ADRs, the Fund generally defines foreign companies as those whose securities are traded primarily on non-U.S. securities exchanges. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment, or shows signs of deteriorating fundamentals, among other reasons. The Fund may deviate from the investment strategy described above for temporary defensive purposes. The Fund may miss certain investment opportunities if defensive strategies are used and thus may not achieve its investment objective. PRINCIPAL RISKSAs with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. The principal risks of investing in the Fund, which could adversely affect its performance, include: As with any investment in a mutual fund, investing in the Fund involves risk, including the risk that you may receive little or no return on your investment. When you redeem your shares, they may be worth more or less than what you paid for them, which means that you may lose a portion or all of the money you invested in the Fund. · Portfolio Management Risk: If the strategies used and investments selected by the Fund’s portfolio management team fail to produce the intended result, the Fund may suffer losses or underperform other funds with the same investment objective or strategies, even in a favorable market. · Market Risk: The market values of securities will fluctuate, sometimes sharply and unpredictably, based on overall economic conditions, governmental actions or intervention, market disruptions caused by trade disputes, tariffs or other factors, political developments, and other factors. Prices of equity securities tend to rise and fall more dramatically than those of debt securities. · Equity Securities Risk: Equity securities, as well as equity-like securities such as convertible debt securities, may experience significant volatility. Such securities may fall sharply in response to adverse events affecting overall markets, a particular industry or sector, or an individual company’s financial condition. · Industry and Sector Risk: Although the Fund does not employ an industry or sector focus, its exposure to specific industries or sectors will increase from time to time based on the portfolio management team’s perception of investment opportunities. If the Fund is overweight in a single industry or sector relative to its benchmark index, the Fund will face an increased risk that the value of its portfolio will decrease because of events disproportionately affecting that industry or sector. Furthermore, investments in particular industries or sectors may be more volatile than the broader market as a whole. · Small Company Risk: Investments in small companies may involve greater risks than investments in larger, more established companies. Securities of small companies tend to be more sensitive to changing economic, market, and industry conditions and tend to be more volatile and less liquid than equity securities of larger companies, especially over the short term. · Value Investing Risk: The prices of value stocks may lag the stock market for long periods of time if the market fails to recognize the company’s intrinsic worth. Value investing also is subject to the risk that a company judged to be undervalued may actually be appropriately priced or even overpriced. · Foreign and Emerging Market Company Risk: Investments in foreign companies and in U.S. companies with economic ties to foreign markets generally involve special risks. These companies may be more vulnerable to economic, political, and social instability and subject to less government supervision, lack of transparency, inadequate regulatory and accounting standards, and foreign taxes. Foreign company securities also include ADRs, which may be less liquid than the underlying shares in their primary trading market. Foreign securities also may subject the Fund’s investments to changes in currency exchange rates. Emerging market securities generally are more volatile than other foreign securities, and are subject to greater liquidity, regulatory, and political risks. Investments in emerging markets may be considered speculative and generally are riskier than investments in more developed markets. Emerging markets are more likely to experience hyperinflation and currency devaluations. Securities of emerging market companies may have far lower trading volumes and less liquidity than securities of issuers in developed markets. In certain emerging market countries, governments participate to a significant degree in their respective economies. Action by these governments could have a significant adverse effect on market prices of securities and payment of dividends. Companies with economic ties to emerging markets may be susceptible to the same risks as companies organized in emerging markets. · Foreign Currency Risk: Investments in securities that are denominated or receiving revenues in foreign currencies are subject to the risk that those currencies will decline in value relative to the U.S. dollar, or, in the case of hedged positions, that the U.S. dollar will decline in value relative to the currency being hedged. Foreign currency exchange rates may fluctuate significantly over short periods of time. · Real Estate Risk: An investment in a REIT generally is subject to the risks that impact the value of the underlying properties or mortgages of the REIT. These risks include loss to casualty or condemnation, and changes in supply and demand, interest rates, zoning laws, regulatory limitations on rents, property taxes, and operating expenses. Other factors that may adversely affect REITs include poor performance by management of the REIT, changes to the tax laws, or failure by the REIT to qualify for favorable tax treatment under the Internal Revenue Code of 1986, as amended (the “Code”), and changes in local, regional, or general economic conditions. · Liquidity/Redemption Risk: The Fund may lose money when selling securities at inopportune times to fulfill shareholder redemption requests. The risk of loss may increase depending on the size and frequency of redemption requests, whether the redemption requests occur in times of overall market turmoil or declining prices, and whether the securities the Fund intends to sell have decreased in value or are illiquid. The Fund may be less able to sell illiquid securities at its desired time or price. It may be more difficult for the Fund to value its investments in illiquid securities than more liquid securities. An investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. PERFORMANCE The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. Each assumes reinvestment of dividends and distributions. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart and table below provide some indication of the risks of investing in the Fund by illustrating the variability of the Fund’s returns. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future. The bar chart shows changes in the performance of the Fund’s Class A shares from calendar year to calendar year. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. Performance for the Fund’s other share classes will vary due to the different expenses each class bears. Updated performance information is available at www.lordabbett.com or by calling 888-522-2388. This chart does not reflect the sales charge applicable to Class A shares. If the sales charge were reflected, returns would be lower. www.lordabbett.com 888-522-2388 Bar Chart (per calendar year) - Class A Shares Best Quarter 4th Q 2020 +29.79% Worst Quarter 1st Q 2020 -37.69% Best Quarter 2020-12-31 0.2979 Worst Quarter 2020-03-31 -0.3769 The table below shows how the Fund’s average annual total returns compare to the returns of a securities market index with investment characteristics similar to those of the Fund as well as to a broad-based securities market index.1 The Fund’s average annual total returns include applicable sales charges.The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares.1The Fund has adopted the S&P 500® Index as its broad-based securities market index. The Fund’s average annual total returns include applicable sales charges. The after-tax returns of Class A shares included in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. In some cases, the return after taxes on distributions and sale of Fund shares may exceed the return before taxes due to a tax benefit resulting from realized losses on a sale of Fund shares at the end of the period that is used to offset other gains. The after-tax returns shown are not relevant to investors who hold their Fund shares through tax-advantaged arrangements such as 401(k) plans or Individual Retirement Accounts (“IRAs”). After-tax returns for other share classes are not shown in the table and will vary from those shown for Class A shares. Average Annual Total Returns (for the periods ended December 31, 2025) -0.0518 0.0598 0.0598 -0.0657 0.0418 0.0359 -0.0205 0.0452 0.0433 -0.0052 0.0647 0.0582 0.0074 0.0740 0.0677 0.0095 0.0760 0.0575 2017-04-04 0.0086 0.0752 0.0688 0.0044 0.0703 0.0640 0.0035 0.0688 0.0625 0.0036 0.0698 0.0635 0.0062 0.0725 0.0662 0.0091 0.0752 0.0689 0.0095 0.0760 0.0697 Russell 2000® Value Index 0.1259 0.0888 0.0927 0.0739 2017-04-04 (reflects no deduction for fees, expenses, or taxes) S&P 500® Index 0.1788 0.1442 0.1482 0.1486 2017-04-04 485BPOS 2025-11-30 0000887194 false 2026-03-25 2026-04-01 N-1A ~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006998Summary1Member row dei_LegalEntityAxis compact cik0000887194_S000006998Member ~ ~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006998Summary1Member row dei_LegalEntityAxis compact cik0000887194_S000006998Member ~ ~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006998Summary1Member row dei_LegalEntityAxis compact cik0000887194_S000006998Member ~ ~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006998Summary1Member row dei_LegalEntityAxis compact cik0000887194_S000006998Member ~ ~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006998Summary1Member row dei_LegalEntityAxis compact cik0000887194_S000006998Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~ ~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006999Summary2Member row dei_LegalEntityAxis compact cik0000887194_S000006999Member ~ ~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006999Summary2Member row dei_LegalEntityAxis compact cik0000887194_S000006999Member ~ ~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006999Summary2Member row dei_LegalEntityAxis compact cik0000887194_S000006999Member ~ ~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006999Summary2Member row dei_LegalEntityAxis compact cik0000887194_S000006999Member ~ ~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000887194_S000006999Summary2Member row dei_LegalEntityAxis compact cik0000887194_S000006999Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~ ~ http://xbrl.sec.gov/rr/role/ShareholderFeesData row dei_DocumentInformationDocumentAxis compact cik0000887194_S000007001Summary3Member row dei_LegalEntityAxis compact cik0000887194_S000007001Member ~ ~ http://xbrl.sec.gov/rr/role/OperatingExpensesData row dei_DocumentInformationDocumentAxis compact cik0000887194_S000007001Summary3Member row dei_LegalEntityAxis compact cik0000887194_S000007001Member ~ ~ http://xbrl.sec.gov/rr/role/ExpenseExample row dei_DocumentInformationDocumentAxis compact cik0000887194_S000007001Summary3Member row dei_LegalEntityAxis compact cik0000887194_S000007001Member ~ ~ http://xbrl.sec.gov/rr/role/ExpenseExampleNoRedemption row dei_DocumentInformationDocumentAxis compact cik0000887194_S000007001Summary3Member row dei_LegalEntityAxis compact cik0000887194_S000007001Member ~ ~ http://xbrl.sec.gov/rr/role/PerformanceTableData column period compact * row dei_DocumentInformationDocumentAxis compact cik0000887194_S000007001Summary3Member row dei_LegalEntityAxis compact cik0000887194_S000007001Member row oef_ClassAxis compact * row oef_PerformanceMeasureAxis compact * ~ LORD ABBETT RESEARCH FUND INC 0.1513 0.1909 -0.0473 0.2658 0.155 0.2567 -0.1353 0.1634 0.2233 0.1619 0.0104 0.2284 -0.0336 0.3675 0.4006 0.0661 -0.3259 0.108 0.3074 0.1327 0.2047 0.0631 -0.1188 0.2026 -0.0148 0.2643 -0.1749 0.1981 0.1285 0.006 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 March 31, 2027 These amounts have been updated from fiscal year amounts to reflect current fees and expenses. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. ~ http://www.lordabbett.com/20251130/role/RRRiskTable3 ~ ~ http://www.lordabbett.com/20251130/role/RRRiskTable5 ~ ~ http://www.lordabbett.com/20251130/role/RRRiskTable7 ~ A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. For the period from April 1, 2026 through March 31, 2027, Lord Abbett Distributor LLC (“Lord Abbett Distributor”) has contractually agreed to waive the Fund’s 0.10% Rule 12b-1 fee for Class F shares. This agreement may be terminated only by the Fund’s Board of Directors. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. For the period from April 1, 2026 through March 31, 2027, Lord, Abbett & Co. LLC (“Lord Abbett”) has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding any applicable 12b-1 fees, acquired fund fees and expenses, interest-related expenses, taxes, expenses related to litigation and potential litigation, and extraordinary expenses, to an annual rate of 0.62% for each of Class F3 and R6 shares and to an annual rate of 0.71% for each other class. This agreement may be terminated only by the Fund’s Board of Directors. These amounts have been updated from fiscal year amounts to reflect current fees and expenses. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares. A shareholder transacting in share classes without a front-end sales charge may be required to pay a commission to its financial intermediary. Please contact your financial intermediary for more information about whether such a commission may apply to your transaction. A contingent deferred sales charge (“CDSC”) of 1.00% may be assessed on certain Class A shares purchased or acquired without a sales charge if they are redeemed before the first day of the month in which the one-year anniversary of the purchase falls. A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase. Class C shares convert to Class A shares eight years after purchase. Class C share performance does not reflect the impact of such conversion to Class A shares.