Form 497K LORD ABBETT MUNICIPAL

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January 28, 2019 3:38 PM EST

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SUMMARY PROSPECTUS

Lord Abbett
Short Duration High Yield Municipal Bond Fund

FEBRUARY 1, 2019


CLASS/TICKER
CLASS A	SDHAX	CLASS F	SDHFX	CLASS I	SDHIX
CLASS C	SDHCX	CLASS F3	HYMQX

Important Information:
Intent to adopt alternate shareholder report delivery
option under SEC Rule 30e-3

Beginning in January 2021, as permitted by regulations adopted by the Securities and Exchange Commission, paper copies of the Fund’s shareholder reports will no longer be sent by mail, unless you specifically request paper copies of the reports from the Fund or from your financial intermediary, such as a broker-dealer, investment advisor or bank. Instead, the reports will be made available on Lord Abbett’s website and you will be notified by mail each time a report is posted and provided with a website link to access the report.

If you already elected to receive shareholder reports electronically, you will not be affected by this change and you need not take any action. Shareholders who hold accounts directly with the Fund may elect to receive shareholder reports and other communications from the Fund electronically by signing into your Lord Abbett online account at lordabbett.com and selecting “Log In.” For further information, you may also contact the Funds at (800) 821-5129. Shareholders who hold accounts through a financial intermediary should contact them directly.

You may elect to receive all future reports in paper free of charge by contacting the Fund at (800) 821-5129. Your election to receive reports in paper will apply to all funds held with Lord Abbett. If your fund shares are held through a financial intermediary please contact them directly. Your election applies to all funds held with that intermediary.

Before you invest, you may want to review the Fund’s prospectus and statement of additional information, which contain more information about the Fund and its risks. You can find the Fund’s prospectus, statement of additional information and other information about the Fund at www.lordabbett.com/documentsandliterature. You can also get this information at no cost by calling 888-522-2388 (Option #2) or by sending an email request to [email protected]. The current prospectus and statement of additional information dated February 1, 2019, as may be supplemented from time to time, are incorporated by reference into this summary prospectus.

INVESTMENT OBJECTIVE

The investment objective of the Fund is to seek a high level of income exempt from federal income tax.

FEES AND EXPENSES

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. 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 $100,000 in the Lord Abbett Family of Funds. More information about these and other discounts is available from your financial professional and in “Sales Charge Reductions and Waivers” on page 156 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”).


Shareholder Fees⁽¹⁾ (Fees paid directly from your investment)

Class	A	C	F, F3, and I

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	2.25%	None	None

Maximum Deferred Sales Charge (Load) (as a percentage of offering price or redemption proceeds, whichever is lower)	None⁽²⁾	1.00%⁽³⁾	None

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND


Annual Fund Operating Expenses (Expenses that you pay each year as a percentage of the value of your investment)

Class	A	C	F	F3	I

Management Fees	0.40%	0.40%	0.40%	0.40%	0.40%

Distribution and Service (12b-1) Fees	0.20%	0.87%⁽⁴⁾	0.10%	None	None

Other Expenses	0.18%	0.18%	0.18%	0.13%	0.18%

Total Annual Fund Operating Expenses	0.78%	1.45%	0.68%	0.53%	0.58%

Fee Waiver and/or Expense Reimbursement⁽⁵⁾	(0.23)%	(0.23)%	(0.23)%	(0.23)%	(0.23)%

Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement⁽⁵⁾	0.55%	1.22%	0.45%	0.30%	0.35%

⁽¹⁾

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.

⁽²⁾

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 of the one-year anniversary of the purchase.

⁽³⁾

A CDSC of 1.00% may be assessed on Class C shares if they are redeemed before the first anniversary of their purchase.

⁽⁴⁾

The 12b-1 fee the Fund will pay on Class C shares will be a blended rate calculated based on (i) 1.00% of the Fund’s average daily net assets attributable to shares held for less than one year and (ii) 0.80% of the Fund’s average daily net assets attributable to shares held for one year or more. All Class C shareholders of the Fund will bear 12b-1 fees at the same rate.

⁽⁵⁾

For the period from February 1, 2019 through January 31, 2020, Lord, Abbett & Co. LLC has contractually agreed to waive its fees and reimburse expenses to the extent necessary to limit total net annual operating expenses, excluding 12b-1 fees, acquired fund fees and expenses, and interest related expenses, to an annual rate of 0.30% for Class F3 and to an annual rate of 0.35% for each other class. This agreement may be terminated only by the Fund’s Board of Directors.

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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:


Class	If Shares Are Redeemed												If Shares Are Not Redeemed

	1 Year			3 Years			5 Years			10 Years			1 Year			3 Years			5 Years			10 Years

Class A Shares		$	280		$	446		$	626		$	1,148		$	280		$	446		$	626		$	1,148

Class C Shares		$	224		$	436		$	770		$	1,716		$	124		$	436		$	770		$	1,716

Class F Shares		$	46		$	194		$	356		$	825		$	46		$	194		$	356		$	825

Class F3 Shares		$	31		$	147		$	273		$	643		$	31		$	147		$	273		$	643

Class I Shares		$	36		$	163		$	301		$	704		$	36		$	163		$	301		$	704

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

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 29% of the average value of its portfolio.

PRINCIPAL INVESTMENT STRATEGIES

To pursue its investment objective, under normal conditions, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in municipal bonds that pay interest exempt from federal income tax. These municipal bonds and other securities in which the Fund may invest may pay interest that is subject to the federal alternative minimum tax (“AMT”) for certain taxpayers. Normally, the Fund seeks to maintain an investment portfolio with a weighted average effective duration of less than 4.5 years.

Although the Fund may invest in municipal bonds in any rating category, under normal conditions, the Fund invests at least 50% of its net assets in municipal bonds rated BBB+/Baa1 or lower (at the time of purchase) by an independent rating agency or that are unrated but deemed by Lord, Abbett & Co. LLC (“Lord Abbett”) to be of comparable quality, with a particular emphasis on lower rated municipal bonds (commonly referred to as “below investment grade,” “high yield,” or “junk” bonds), which are bonds that are rated BB+/Ba1 or lower (at the time of purchase) by an independent rating agency or are unrated but deemed by Lord Abbett to be of comparable quality. The Fund may invest without limitation in unrated municipal bonds, which may constitute a significant portion of the Fund’s portfolio. The Fund is nondiversified, which means it may invest a greater portion of its assets in a single issuer than a diversified fund.

The Fund also may invest in defaulted securities (i.e., bonds on which the issuer has not paid principal or interest on time) and securities of issuers that are or may become involved in reorganizations, financial restructurings, or bankruptcy (commonly referred to as “distressed debt”). The Fund presently does not intend to invest more than 20% of its net assets (measured at the time of investment) in such defaulted or distressed securities. However, the Fund’s defaulted or distressed debt holdings may exceed this level from time to time if the Fund purchased securities that were not considered in default or distressed at their time of purchase and such securities subsequently become defaulted or distressed. These investment strategies should be considered to entail higher risk relative to strategies employed by funds that invest primarily in investment grade municipal bonds.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

The Fund may invest in all types of municipal bonds, including general obligation bonds, revenue bonds, and municipal leases. Municipal bonds are debt securities issued by or on behalf of U.S. states, territories (such as Puerto Rico), and possessions and their political subdivisions, agencies, and instrumentalities that provide income that generally is exempt from regular federal or, as applicable, state and/or local personal income tax. The Fund may invest in both insured and uninsured municipal bonds.

The Fund may invest up to 100% of its net assets in private activity bonds (commonly referred to as “AMT paper”), which are a type of municipal bond that pays interest subject to AMT. Although the Fund is permitted to invest up to 20% of its net assets in fixed income securities that pay interest subject to regular federal income tax, the Fund presently has no intention of investing in this manner. There is a risk that a bond issued as tax-exempt may be reclassified by the Internal Revenue Service (“IRS”) as taxable. The Fund will not invest more than 25% of its total assets in any industry; however, this limitation does not apply to tax-exempt securities and securities issued by the U.S. Government or its agencies or instrumentalities. Certain types of municipal securities (including general obligation, general appropriation, municipal leases, special assessment, and special tax bonds) are not considered a part of any “industry” for purposes of this industry concentration policy. Therefore, the Fund may invest more than 25% of its total assets in these types of municipal securities. The Fund may invest without limitation in securities of issuers located in a single state, territory, municipality, or region.

The Fund may invest up to 15% of its net assets (measured at the time of investment) in illiquid securities.

The Fund may invest up to 100% of its assets in inverse floaters (also known as “residual interest bonds”), which are a type of derivative investment that provides leveraged exposure to underlying municipal bonds whose interest payments vary inversely with changes in short-term tax-exempt interest rates. These investments are intended to increase the Fund’s income and potential investment return. The Fund also may invest in other types of derivatives, such as futures, for non-hedging, hedging, or duration management purposes.

The maturity of a security measures the time until final payment is due, whereas duration takes into account the expected pattern of all payments of interest and principal on a security over time, including how these payments are affected by changes in interest rates. The Fund may invest in individual securities of any maturity or duration. Because the Fund primarily invests in short duration municipal bonds, it is less sensitive to interest rate changes than a fund that focuses on longer duration bonds.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

The Fund’s portfolio management team focuses on credit risk analysis, tax-exempt income yield, total return potential, interest rate risk, and call protection in managing its portfolio. The Fund may sell a security when the Fund believes the security is less likely to benefit from the current market and economic environment, shows signs of deteriorating fundamentals, or has reached its valuation target, among other reasons.

The Fund seeks to remain fully invested in accordance with its investment objective. The Fund may, however, deviate entirely 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 RISKS

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.

The following is a summary of the principal risks of investing in the Fund, which could adversely affect its performance or increase volatility:

•

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, political developments, and other factors. Although prices of debt securities tend to rise and fall less dramatically than those of equity securities, they may experience heightened volatility.

•

Fixed Income Securities Risk – The Fund is subject to the general risks and considerations associated with investing in debt securities, including the risk that issuers will fail to make timely payments of principal or interest or default altogether. Typically, shorter-term bonds are less volatile than longer-term bonds; however, longer-term bonds typically offer higher yields and more stable interest income than shorter-term bond investments. Lower-rated municipal bonds in which the Fund may invest may be more volatile and may decline more in price in response to negative issuer developments or general economic news than higher rated securities. In addition, as interest rates rise, the Fund’s investments typically will lose value.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

•

Municipal Securities Risk – Municipal securities are subject to the same risks affecting fixed income securities in general. In addition, the price of municipal securities may be adversely affected by legislative or political changes, tax rulings, judicial action, changes in market and economic conditions, and the fiscal condition of the municipal issuer, including an insolvent municipality filing for bankruptcy. The Fund may be more sensitive to these events and conditions if it invests a substantial portion of its assets in the municipal securities of similar projects (such as those relating to education, health care, housing, transportation, and utilities) or in particular types of municipal securities (such as general obligation bonds, private activity bonds, and special tax bonds) or in the securities of issuers located within a single state, municipality, territory (such as Puerto Rico), or geographic area. The market for municipal securities generally is less liquid than other securities markets, which may make it more difficult for the Fund to sell its municipal securities. Nongovernmental users of facilities financed by tax-exempt revenue bonds (e.g., companies in the electric utility and health care industries) may have difficulty making payments on their obligations in the event of an economic downturn. This would negatively affect the valuation of municipal securities issued by such facilities.

•

Below Investment Grade Municipal Bond Risk – Below investment grade municipal bonds typically pay a higher yield than investment grade municipal bonds, but may have greater price fluctuations and have a higher risk of default than investment grade municipal bonds. The market for below investment grade municipal bonds may be less liquid due to such factors as specific municipal developments, interest rate sensitivity, negative perceptions of the junk bond markets generally, and less secondary market liquidity. This may make such bonds more difficult to sell at an acceptable price, especially during periods of financial distress, increased market volatility, or significant market decline.

•

Nondiversification Risk – Because the Fund is nondiversified, it will be more exposed to risks from a single adverse economic, political, or regulatory event than a diversified fund.

•

Call Risk – A substantial portion of municipal bonds are “callable,” meaning they give the issuer the right to call or redeem the bonds before maturity. As interest rates decline, these bond issuers may pay off their loans early by buying back the bonds, thus depriving the Fund of above market interest rates. Moreover, the Fund may not recoup the full amount of its initial investment and may have to reinvest the prepayment proceeds in lower yielding securities, securities with greater credit risks, or other less attractive securities.

•

Credit Risk – Municipal bonds are subject to the risk that the issuer or guarantor of a security may not make interest and principal payments as they become due or may default altogether. In addition, if the market perceives a

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

deterioration in the creditworthiness of an issuer, the value and liquidity of bonds issued by that issuer may decline. Credit risk varies based upon the economic and fiscal conditions of each issuer and the municipalities, agencies, instrumentalities, and other issuers within the state, territory, or possession. As noted above, because the Fund invests a substantial portion of its assets in below investment grade securities, these risks are heightened. Insured municipal bonds have the credit risk of the insurer in addition to the credit risk of the underlying investment being insured. A decline in the credit quality of private activity bonds usually is directly related to a decline in the credit standing of the private user of the facility.

•

Defaulted Bonds Risk – Defaulted bonds are subject to greater risk of loss of income and principal than higher rated securities and are considered speculative. In the event of a default, the Fund may incur additional expenses to seek recovery. The repayment of defaulted bonds is subject to significant uncertainties, and in some cases, there may be no recovery of repayment. Defaulted bonds might be repaid only after lengthy workout or bankruptcy proceedings, during which the issuer might not make any interest or other payments. Workout or bankruptcy proceedings typically result in only partial recovery of cash payments or an exchange of the defaulted bond for other securities of the issuer or its affiliates, which may in turn be illiquid or speculative.

•

Derivatives Risk – The risks associated with derivatives may be different from and greater than the risks associated with directly investing in securities and other investments. Derivatives may increase the Fund’s volatility and reduce its returns. The risks associated with derivatives include, among other things, the following:

•

The risk that the value of a derivative may not correlate with the value of the underlying asset, rate, or index in the manner anticipated by the portfolio management team and may be more sensitive to changes in economic or market conditions than anticipated.

•

Derivatives may be difficult to value, especially under stressed or unforeseen market conditions.

•

The risk that the counterparty may fail to fulfill its contractual obligations under the derivative contract. Central clearing of derivatives is intended to decrease counterparty risk but does not eliminate it.

•

The Fund may be required to segregate permissible liquid assets to cover its obligations under these transactions and may have to liquidate positions before it is desirable to do so to fulfill its segregation requirements.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

•

The risk that there will not be a liquid secondary trading market for the derivative, or that the Fund will otherwise be unable to sell or otherwise close a derivatives position when desired, exposing the Fund to additional losses.

•

Because derivatives generally involve a small initial investment relative to the risk assumed (known as leverage), derivatives can magnify the Fund’s losses and increase its volatility.

•

The Fund’s use of derivatives may affect the amount, timing, and character of distributions, and may cause the Fund to realize more short-term capital gain and ordinary income than if the Fund did not use derivatives.

Derivatives may not perform as expected and the Fund may not realize the intended benefits. Whether the Fund’s use of derivatives is successful will depend on, among other things, the portfolio managers’ ability to correctly forecast market movements and other factors. If the portfolio managers incorrectly forecast these and other factors, the Fund’s performance could suffer. In addition, given their complexity, derivatives are subject to the risk that improper or misunderstood documentation may expose the Fund to losses.

The Fund’s use of inverse floaters may reduce the Fund’s returns and/or increase the Fund’s volatility. Inverse floaters typically are more volatile than fixed rate municipal bonds. Distributions on inverse floaters are inversely related to short-term municipal bond interest rates. Therefore, distributions paid to the Fund on its inverse floaters will fall when short-term municipal interest rates rise and will rise when short-term municipal interest rates fall. Inverse floaters generally will underperform the market for fixed rate municipal bonds in a rising interest rate environment. Holders of inverse floaters bear the risk of the fluctuation in value of the issuing trust’s underlying municipal bonds because holders of the floaters have the right to tender their notes back to the trust for payment at par plus accrued interest. This creates effective leverage because the Fund’s net cash investment is significantly less than the value of the underlying bonds. The leverage ratio increases as the value of the inverse floaters becomes a greater proportion of the value of the municipal bonds deposited into the trust.

•

Distressed Debt Risk – To the extent that the Fund invests in (or otherwise holds) distressed debt securities, the Fund is subject to an increased risk that it may lose a portion or all of its investment in the distressed debt and may incur higher expenses trying to protect its interests in distressed debt. The prices of distressed bonds are likely to be more sensitive to adverse economic changes or individual issuer developments than the prices of higher rated securities. During an economic downturn or substantial period of rising interest rates, distressed security issuers may experience financial stress that

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

would adversely affect their ability to service their principal and interest payment obligations, to meet their projected business goals, or to obtain additional financing. Moreover, it is unlikely that a liquid market will exist for the Fund to sell its holdings in distressed debt securities.

•

Extension Risk – Rising interest rates may cause an issuer to pay off or retire a debt security later than expected, extending the duration of a bond, making them more sensitive to changes in interest rates. This typically will reduce the bond’s value, and cause the Fund to be unable to reinvest in higher yielding securities unless it is willing to incur a loss by selling its current holding.

•

Governmental Risk – Government actions, including U.S. federal government actions and actions by local, state, and regional governments, could have an adverse effect on municipal bond prices. In addition, the Fund’s performance may be affected by local, state, and regional factors depending on the states or territories in which the Fund’s investments are issued.

•

Interest Rate Risk – As interest rates rise, prices of bonds (including tax-exempt bonds) generally fall, typically causing the Fund’s investments to lose value. Additionally, rising interest rates or lack of market participants may lead to decreased liquidity in the fixed income markets. Interest rate changes typically have a greater effect on the price of longer-term bonds, including inverse floaters, than on the price of shorter-term bonds. A wide variety of market factors can cause interest rates to rise, including central bank monetary policy, rising inflation, and changes in general economic conditions. The Fund will be exposed to heightened interest rate risk as interest rates rise from historically low levels.

•

Liquidity/Redemption Risk – It may be difficult for the Fund to sell certain securities, including below investment grade municipal bonds, in a timely manner and at their stated value, which could result in losses to the Fund. In addition, 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 unable to sell illiquid securities at its desired time or price. As noted, the market for below investment grade municipal bonds generally is less liquid than the market for higher rated bonds, subjecting them to greater price fluctuations. The purchase price and subsequent valuation of illiquid securities normally reflect a discount, which may be significant, from the market price of comparable securities for which a liquid market exists. Illiquidity can be caused by a variety of factors, including economic conditions, market events, events relating to the issuer of

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

the securities, a drop in overall market trading volume, an inability to find a ready buyer, or legal restrictions on the securities’ resale. Certain securities that are liquid when purchased may later become illiquid, particularly in times of overall economic distress. Liquidity risk may be magnified in a rising interest rate environment or other circumstances where investor redemptions from fixed income mutual funds may be higher than normal, causing increased supply in the market due to selling activity.

•

Short Duration Risk – Although any rise in interest rates is likely to cause the prices of debt obligations to fall, the comparatively short duration of the Fund’s portfolio holdings is intended to mitigate some of this risk. The Fund generally will earn less income and, during periods of declining interest rates, will provide lower total returns to investors than funds with longer durations.

•

State and Territory Risks – Although the Fund does not have a specific geographic focus, from time to time, to the extent the Fund invests in securities of issuers in a particular state, territory (such as Puerto Rico), municipality, or region, the Fund may be more exposed to risks affecting that particular state, territory, municipality, or region. As a result, adverse economic, political, and regulatory conditions affecting that state, territory, or region (and their political subdivisions, agencies, instrumentalities, and public authorities) are likely to affect the Fund’s performance.

•

Taxability Risk – There is a risk that a bond issued as tax-exempt may be reclassified by the IRS as taxable (for example, if the bond was issued in a transaction deemed by the IRS to be abusive), creating taxable rather than tax-exempt income. In addition, the Fund may invest up to 100% of its net assets in municipal bonds the interest on which may be subject to AMT and invest up to 20% of its net assets in fixed income securities that pay interest that is subject to regular federal income tax. The income from private activity bonds is an item of tax preference for purposes of AMT, which may cause the income to be taxable to you. From time to time, proposals have been introduced before Congress for the purpose of restricting or eliminating the federal income tax exemption for interest on certain types of municipal bonds. Additionally, certain other proposals have been introduced that would have the effect of taxing a portion of exempt interest and/or reducing the tax benefits of receiving exempt interest. These legal uncertainties could affect the municipal bond market generally, certain specific segments of the market, or the relative credit quality of particular securities. Additionally, the Fund’s use of derivatives may increase the amount of distributions taxable to you as ordinary income, increase or decrease the amount of capital gain distributions to you, and/or decrease the amount available for distribution to you as exempt-interest dividends.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

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. For more information on the principal risks of the Fund, please see the “More Information About the Funds – Principal Risks” section in the prospectus.

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 show changes in the performance of the Fund’s Class A shares for its first full 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.

Bar Chart (per calendar year) — Class A Shares


Best Quarter 1st Q ’17 +2.06%		Worst Quarter 4th Q ’16 -4.08%

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.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

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.


Average Annual Total Returns (for the periods ended December 31, 2018)

Class	1 Year	Life of Class	Inception Date for Performance

Class A Shares			6/15/2015

Before Taxes	-0.20%	2.07%

After Taxes on Distributions	-0.22%	2.05%

After Taxes on Distributions and Sale of Fund Shares	0.97%	2.20%

Class C Shares	0.44%	1.98%	6/15/2015

Class F Shares	2.20%	2.83%	6/15/2015

Class F3 Shares	2.29%	3.28%	4/4/2017

Class I Shares	2.30%	2.93%	6/15/2015

Index

50% Bloomberg Barclays Municipal Bond 1-8 Year Index/50% Bloomberg Barclays Municipal High Yield 1-8 Year Index (reflects no deduction for fees, expenses, or taxes)	4.41%	1.28% 3.73%	6/15/2015 4/4/2017

MANAGEMENT

Investment Adviser. The Fund’s investment adviser is Lord, Abbett & Co. LLC.

Portfolio Manager.


Portfolio Manager/Title		Member of the Portfolio Management Team Since

Daniel S. Solender, Partner and Director		2015

Gregory M. Shuman, Portfolio Manager		2014

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

PURCHASE AND SALE OF FUND SHARES

The minimum initial and additional amounts shown below vary depending on the class of shares you buy and the type of account. Certain financial intermediaries may impose different restrictions than those described below. For Class I shares, the minimum investment shown below applies to certain types of institutional investors, but does not apply to registered investment advisers or retirement and benefit plans otherwise eligible to invest in Class I shares. See “Choosing a Share Class – Investment Minimums” in the prospectus for more information.


Investment Minimums — Initial/Additional Investments

Class	A and C⁽¹⁾	F	F3	I

General and IRAs without Invest-A-Matic Investments	$1,000/No minimum	N/A	No minimum	$1 million/No minimum

Invest-A-Matic Accounts⁽²⁾	$250/$50	N/A	No minimum	N/A

IRAs, SIMPLE and SEP Accounts with Payroll Deductions	No minimum	N/A	N/A	N/A

Fee-Based Advisory Programs and Retirement and Benefit Plans	No minimum	No minimum	No minimum	No minimum


⁽¹⁾		There is no investment minimum for Class A shares purchased by investors maintaining an account with a financial intermediary that has entered into an agreement with Lord Abbett Distributor LLC to offer Class A shares through a load-waived network or platform, which may or may not charge transaction fees.
⁽²⁾		There is no minimum initial investment for Invest-A-Matic accounts held directly with the Fund, including IRAs.

You may sell (redeem) shares through your securities broker, financial professional or financial intermediary on any business day the Fund calculates its net asset value. If you have direct account access privileges, you may redeem your shares by contacting the Fund in writing at P.O. Box 219336, Kansas City, MO 64121, by calling 888-522-2388 or by accessing your account online at www.lordabbett.com.

TAX INFORMATION

The Fund’s distributions of interest on municipal bonds generally are not subject to federal income tax; however, the Fund may distribute taxable dividends, including distributions of short-term and long-term capital gains. In addition, interest on certain bonds may be subject to the federal alternative minimum tax. To the extent that the Fund’s distributions are derived from interest on bonds that are not exempt from applicable state and local taxes, such distributions will be subject to such state and local taxes.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND

PAYMENTS TO BROKER-DEALERS AND OTHER FINANCIAL INTERMEDIARIES

If you purchase Fund shares through a broker-dealer or other financial intermediary (such as a bank), the Fund and the Fund’s distributor or its affiliates may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other financial intermediary and your individual financial professional to recommend the Fund over another investment. Ask your individual financial professional or visit your financial intermediary’s website for more information.

SUMMARY – SHORT DURATION HIGH YIELD MUNICIPAL BOND FUND