STATEMENT OF ADDITIONAL INFORMATION

APRIL 1, 2025

AS SUPPLEMENTED TO DATE

LORD ABBETT INVESTMENT TRUST

Lord Abbett Multi-Asset Balanced

Opportunity Fund

Lord Abbett Core Fixed Income Fund

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

A

LABFX

R2

BLAQX

A

LCRAX

R2

LCRQX

C

BFLAX

R3

BLARX

C

LCRCX

R3

LCRRX

F

BLAFX

R4

BLASX

F

LCRFX

R4

LCRSX

F3

LOBFX

R5

BLATX

F3

LCROX

R5

LCRTX

I

LABYX

R6

BLAVX

I

LCRYX

R6

LCRVX

P

LABPX

P

N/A

Lord Abbett Multi-Asset Income Fund

Lord Abbett Core Plus Bond Fund

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

A

ISFAX

R2

LIGQX

A

LAPLX

R2

N/A

C

ISFCX

R3

LIXRX

C

LAPCX

R3

LAPQX

F

LIGFX

R4

LIXSX

F

LPLFX

R4

LAPUX

F3

ISFOX

R5

LIXTX

F3

LOPLX

R5

LAPVX

I

ISFYX

R6

LIXVX

I

LAPIX

R6

LAPWX

P

N/A

Lord Abbett Convertible Fund

Lord Abbett Floating Rate Fund

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

A

LACFX

R2

LBCQX

A

LFRAX

R2

LFRRX

C

LACCX

R3

LCFRX

C

LARCX

R3

LRRRX

F

LBFFX

R4

LCFSX

F

LFRFX

R4

LRRKX

F3

LOCFX

R5

LCFTX

F3

LFROX

R5

LRRTX

I

LCFYX

R6

LCFVX

I

LFRIX

R6

LRRVX

P

LCFPX

Lord Abbett High Yield Fund

Lord Abbett Short Duration Income Fund

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

A

LHYAX

R2

LHYQX

A

LALDX

R2

LDLQX

C

LHYCX

R3

LHYRX

C

LDLAX

R3

LDLRX

F

LHYFX

R4

LHYSX

F

LDLFX

R4

LDLKX

F3

LHYOX

R5

LHYTX

F3

LOLDX

R5

LDLTX

I

LAHYX

R6

LHYVX

I

LLDYX

R6

LDLVX

P

LHYPX

P

N/A

Lord Abbett Income Fund

Lord Abbett Total Return Fund

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

A

LAGVX

R2

LAUQX

A

LTRAX

R2

LTRQX

C

LAUSX

R3

LAURX

C

LTRCX

R3

LTRRX

F

LAUFX

R4

LAUKX

F

LTRFX

R4

LTRKX

F3

LOGVX

R5

LAUTX

F3

LTROX

R5

LTRTX

I

LAUYX

R6

LAUVX

I

LTRYX

R6

LTRHX

P

N/A

P

LTRPX

Lord Abbett Inflation Focused Fund

Lord Abbett Ultra Short Bond Fund

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

A

LIFAX

R2

LIFQX

A

LUBAX

I

LUBYX

C

LIFCX

R3

LIFRX

A1

LUSNX

R5

LUBVX

F

LIFFX

R4

LIFKX

F

LUBFX

R6

LUBWX

F3

LIFOX

R5

LIFTX

F3

LUBOX

I

LIFIX

R6

LIFVX

Lord Abbett Short Duration Core Bond

Fund

CLASS

TICKER

CLASS

TICKER

A

LDCAX

R2

N/A

C

LDCCX

R3

LDCRX

F

LDCFX

R4

LSCSX

F3

LSCOX

R5

LSCUX

I

LSCIX

R6

LDCVX

This SAI is not a prospectus. A prospectus may be obtained from your financial intermediary or from the

Distributor at 30 Hudson Street, Jersey City, NJ 07302-4804. This SAI is divided into two Parts - Part I

and Part II. Part I contains information that is particular to the Funds offered in this SAI, and should be

read in conjunction with the prospectus for the Funds offered in this SAI, dated April 1, 2025, as

supplemented from time to time. Part I includes information about the Funds, including investment

policies, management fees paid by the Funds, and information about other fees applicable to and

services provided to the Funds. Part II contains additional information that more generally applies to the

Lord Abbett Funds.

Each Fund’s

audited financial statements are incorporated into this SAI by reference to the Funds’ most

recent Form N-CSR. The Funds’ annual and semiannual reports to shareholders and Form N-CSR are

available without charge, upon request by calling 888-522-2388. In addition, you can make inquiries

through your financial intermediary.

PART I

TABLE OF CONTENTS

PAGE

1.

GLOSSARY

1-1

2.

FUND INFORMATION

2-1

3.

INVESTMENT POLICIES

3-1

4.

FUND INVESTMENTS

4-1

5.

BOARD MEMBERS

5-1

6.

INVESTMENT ADVISORY AND OTHER SERVICES, FEES, AND EXPENSES

6-1

7.

PORTFOLIO MANAGER INFORMATION

7-1

8.

SECURITIES LENDING

8-1

9.

CONTROL PERSONS AND PRINCIPAL SHAREHOLDERS

9-1

10.

FINANCIAL STATEMENTS

10-1

Part I

1-1

1.

GLOSSARY

Lord Abbett Investment Trust is comprised of the following Funds:

Lord Abbett Multi-Asset Balanced Opportunity Fund:

Multi-Asset Balanced Opportunity Fund

Lord Abbett Multi-Asset Income Fund:

Multi-Asset Income Fund

Lord Abbett Convertible Fund:

Convertible Fund

Lord Abbett Core Fixed Income Fund:

Core Fixed Income Fund

Lord Abbett Core Plus Bond Fund:

Core Plus Bond Fund

Lord Abbett Floating Rate Fund:

Floating Rate Fund

Lord Abbett High Yield Fund:

High Yield Fund

Lord Abbett Income Fund:

Income Fund

Lord Abbett Inflation Focused Fund:

Inflation Focused Fund

Lord Abbett Short Duration Core Bond Fund:

Short Duration Core Bond Fund

Lord Abbett Short Duration Income Fund:

Short Duration Income Fund

Lord Abbett Total Return Fund:

Total Return Fund

Lord Abbett Ultra Short Bond Fund:

Ultra Short Bond Fund

Lord Abbett Funds

are comprised of the following management investment companies:

Lord Abbett Affiliated Fund, Inc.:

Affiliated Fund

Lord Abbett Bond Debenture Fund, Inc.:

Bond Debenture Fund

Lord Abbett Developing Growth Fund, Inc.:

Developing Growth Fund

Lord Abbett Global Fund, Inc.:

Global Fund

Lord Abbett Investment Trust:

Investment Trust

Lord Abbett Mid Cap Stock Fund, Inc.:

Mid Cap Stock Fund

Lord Abbett Municipal Income Fund, Inc.:

Municipal Income Fund

Lord Abbett Research Fund, Inc.:

Research Fund

Lord Abbett Securities Trust:

Securities Trust

Lord Abbett Series Fund, Inc.:

Series Fund

Lord Abbett Trust I:

Trust I

Lord Abbett U.S. Government & Government Sponsored Enterprises Money Market Fund, Inc.:

Money Market Fund

Part I

1-2

1933 Act

Securities Act of 1933, as amended

1940 Act

Investment Company Act of 1940, as amended

Board

Board of Trustees

Board Member(s)

Trustee(s) of the Board

CDSC

Contingent deferred sales charge

CEA

Commodity Exchange Act, as amended

CPO

Commodity pool operator

Distributor

Lord Abbett Distributor LLC

Fund(s)

Each separate investment portfolio of a Registrant or, if a

Registrant has only a single investment portfolio, the Registrant

Fund(s)-of-Funds

Multi-Asset Balanced Opportunity Fund and Multi-Asset Income

Fund

Independent Board Member(s)

Trustee(s) of the Board who are not “interested persons” as

defined in the 1940 Act, of each Fund

Interested Board Member(s)

Trustee(s) of the Board who are not Independent Board

Members

Lord Abbett

Lord, Abbett & Co. LLC

Moody’s

Moody’s Investors Service, Inc.

NYSE

New York Stock Exchange

Registrant

Investment Trust

Rule 12b-1 Plan

Distribution and/or Shareholder Service Plan adopted under

Rule

12b-1 (under the 1940 Act)

S&P

S&P Global Ratings

SAI

Statement of Additional Information

SEC

United States Securities and Exchange Commission

Underlying Funds

Affiliated mutual funds managed by Lord Abbett

Part I

2-1

2.

FUND INFORMATION

The Registrant is an open-end management investment company registered under the 1940 Act. All

Funds are diversified within the meaning of the 1940 Act. The tables below set forth information about

the Registrant’s organization.

Registrant Organization

Registrant

Form of Organization

Date of

Organization

Number

of Funds

Shares

Available for

Issuance

Investment Trust

Delaware statutory trust

August 16, 1993

13

Unlimited

Part I

3-1

3.

INVESTMENT POLICIES

Fundamental Investment Restrictions.

Each Fund’s investment objective cannot be changed without

the approval of a “majority of the Fund’s outstanding shares,”

1

except for the investment objective of Short

Duration Core Bond Fund, which may be changed by the Board without shareholder approval. Each Fund

also is subject to the following fundamental investment restrictions that cannot be changed without the

approval of a majority of each Fund’s outstanding shares.

Each Fund may not:

1. borrow money, except that (i) it may borrow from banks (as defined in the 1940 Act)

2

in amounts

up to

33⅓%

of its total assets (including the amount borrowed), (ii) it may borrow up to an

additional 5% of its total assets for temporary purposes, (iii) it may obtain such short-term credit

as may be necessary for the clearance of purchases and sales of portfolio securities, (iv) it may

purchase securities on margin to the extent permitted by applicable law,

3

and (v) it may borrow

money from other Lord Abbett Funds to the extent permitted by applicable law and any exemptive

relief obtained by the Fund;

2. pledge its assets (other than to secure borrowings, or to the extent permitted by each Fund’s

investment policies as permitted by applicable law);

4

3. engage in the underwriting of securities, except pursuant to a merger or acquisition or to the

extent that, in connection with the disposition of its portfolio securities, it may be deemed to be an

underwriter under federal securities laws;

4. with respect to Floating Rate Fund, make loans, except that the Fund may (i) lend portfolio

securities in accordance with the Fund’s investment policies, (ii) enter into repurchase

agreements, (iii) purchase all or a portion of an issue of publicly distributed debt securities, bank

loan interests (including novations, assignments, and participations), bank certificates of deposit,

acceptances, debentures, or other securities, whether or not the purchase is made upon the

original issuance of the securities, (iv) participate in a credit facility whereby the Fund may directly

lend to and borrow money from other affiliated funds to the extent permitted under the 1940 Act

or an exemption therefrom, and (v) make loans in any other manner consistent with applicable

law, as amended and interpreted or modified from time to time by any regulatory authority having

jurisdiction;

with respect to Inflation Focused Fund, make loans to other persons, except that the acquisition

of bonds, debentures, or other corporate debt securities and investments in government

obligations, commercial paper, pass-through instruments, certificates of deposit, bankers’

acceptances, repurchase agreements, or any similar instruments shall not be subject to this

limitation, and except further that the Fund may lend money to other Lord Abbett Funds to the

extent permitted by applicable law and any exemptive relief obtained by the Fund;

1

A “majority of the Fund’s outstanding shares” means the vote of the lesser of (1) 67% or more of the voting securities present at a

shareholder meeting, provided that more than 50% of the outstanding voting securities of the Fund are present at the meeting or

represented by proxy, or (2) more than 50% of the outstanding voting securities of the Fund regardless of whether such shareholders

are present at the meeting (or represented by proxy).

2

The term “bank” is defined in Section 2(a)(5) of the 1940 Act.

3

SEC staff guidance currently prohibits a Fund from purchasing any security on margin, except such short-term credits as are

necessary for the clearance of transactions.

4

For the purpose of this restriction the deposit of assets in a segregated account with a Fund’s custodian in connection with any of the

Fund’s investment transactions is not considered to be a pledge of the Fund’s assets.

Part I

3-2

with respect to each Fund except Floating Rate Fund and Inflation Focused Fund, make loans to

other persons, except that (i) the acquisition of bonds, debentures, or other corporate debt

securities and investments in government obligations, commercial paper, pass-through

instruments, certificates of deposit, bankers’ acceptances, repurchase agreements, or any similar

instruments shall not be subject to this limitation, (ii) the Fund may lend its portfolio securities,

provided that the lending of portfolio securities may be made only in accordance with applicable

law, and (iii) the Fund may lend money to other Lord Abbett Funds to the extent permitted by

applicable law and any exemptive relief obtained by the Fund;

5. buy or sell real estate (except that each Fund may invest in securities directly or indirectly

secured by real estate or interests therein or issued by companies, which invest in real estate or

interests therein), or commodities or commodity contracts (except to the extent each Fund may

do so in accordance with applicable law and without registering as a CPO under the CEA as, for

example, with futures contracts);

6. with respect to 75% of each Fund’s gross assets, buy securities of one issuer representing more

than (i) 5% of each Fund’s gross assets, except securities issued or guaranteed by the U.S.

Government, its agencies or instrumentalities, and for each of the Fund-of-Funds, securities

issued by an investment company or (ii) 10% of the voting securities of such issuer;

5

7. with respect to Convertible Fund, Floating Rate Fund, High Yield Fund, Income Fund, Inflation

Focused Fund, Multi-Asset Balanced Opportunity Fund, Multi-Asset Income Fund, and Short

Duration Income Fund, invest more than 25% of its assets, taken at market value, in the

securities of issuers in any particular industry excluding securities of the U.S. Government, its

agencies and instrumentalities;

8. with respect to Income Fund, invest more than 25% of its assets, taken at market value, in the

securities of issuers in any particular industry;

9. with respect to Core Fixed Income Fund, Core Plus Bond Fund, Short Duration Core Bond Fund,

and Total Return Fund, invest more than 25% of its assets, taken at market value, in the

securities of issuers in any particular industry (excluding securities of the U.S. Government, its

agencies and instrumentalities, and mortgage-backed securities as described under “Mortgage-

Related and other Asset-Backed Securities” below); or

10. with respect to Ultra Short Bond Fund, invest more than 25% of its assets, taken at market value,

in the securities of issuers in any particular industry (excluding securities of the U.S. Government,

its agencies and instrumentalities, and the financial services industry); or

11. issue senior securities to the extent such issuance would violate applicable law.

6

5

For purposes of this fundamental investment restriction, the term “gross assets” means “total assets.”

6

Current federal securities laws prohibit each Fund from issuing senior securities (which generally are defined as securities

representing indebtedness), except that the Fund may borrow money from banks in amounts of up to

33⅓%

of its total assets

(including the amount borrowed).

Part I

3-3

Compliance with these fundamental investment restrictions will be determined at the time of the purchase

or sale of the security, except in the case of the first fundamental investment restriction, with which the

Funds must comply on a continuous basis. For purposes of these restrictions, the Funds, with the

exception of Ultra Short Bond Fund, do not consider mortgage-related securities, including commercial

mortgage-backed securities and other privately issued mortgage-related securities, as representing

interests in any particular industry or group of industries.

Non-Fundamental Investment Restriction

. Each Fund also is subject to the following non-fundamental

investment restriction that may be changed by the Registrant’s Board without shareholder approval.

Each Fund may not invest in securities issued by other investment companies as defined in the 1940 Act,

except to the extent permitted by applicable law. A Fund may not, however, rely on Sections 12(d)(1)(F)

and 12(d)(1)(G) of the 1940 Act.

Part I

4-1

4.

FUND INVESTMENTS

The following table identifies the investment types and techniques that Lord Abbett may use in managing

the Funds. A more detailed description of these investment types and techniques, along with the risks

associated with each, is contained in the “Additional Information on Portfolio Investments, Risks, and

Techniques” section of Part II. A Fund may use any or all of these investment types and techniques

indicated below at any one time, and the fact that a Fund may use a particular investment type or

technique does not mean that it will be used. A Fund’s transactions in a particular investment type or use

of a particular technique is subject to the limitations imposed by the Fund’s investment objective, policies,

and restrictions described in the Funds’ prospectus and in this SAI, as well as the federal securities laws.

Each Fund may make other types of investments provided the investments are consistent with the Fund's

investment objective and policies and the Fund's investment restrictions do not expressly prohibit it from

doing so.

In addition, a Fund may receive instruments or investments not contemplated herein through

the conversion or exchange of a permissible investment or as a result of the reorganization or bankruptcy

of the issuer of an otherwise permissible investment, and the Fund may hold or dispose of these

instruments or investments at its discretion.

Please refer to the applicable Fund’s prospectus and the fundamental and non-fundamental investment

restrictions in the “Investment Policies” section of Part I for more information on any applicable limitations.

MULTI-ASSET FUNDS

Investment Types and Techniques

Multi-Asset

Balanced

Opportunity

Fund

Multi-

Asset

Income

Fund

Cash Balance Management Practices

X

X

Convertible Securities

X

X

Synthetic Convertible Securities

X

X

Contingent Convertible Securities

X

X

Debt Securities

X

X

High-Yield or Lower-Rated Debt Securities

X

X

Defaulted Bonds and Distressed Debt

X

X

Depositary Receipts

X

X

Derivatives

X

X

Combined Transactions

X

X

Commodity-Related Investments

X

X

Credit Derivatives

X

X

Forward Contracts

X

X

Futures Contracts

X

X

Options Contracts

X

X

Participation Notes

X

X

Swap Agreements

X

X

Equity Securities

X

X

Common Stocks

X

X

Initial Public Offerings

X

X

Master Limited Partnerships

X

X

Preferred Stocks

X

X

Warrants and Rights

X

X

Foreign Currency Transactions

X

X

Foreign Securities

X

X

Emerging Market Securities

X

X

Illiquid Securities

X

X