STATEMENT OF ADDITIONAL INFORMATION

APRIL 1, 2025

LORD ABBETT RESEARCH FUND, INC.

Lord Abbett Dividend Growth Fund

Lord Abbett Small Cap Value Fund

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

CLASS

TICKER

A

LAMAX

R2

LAMQX

A

LRSCX

R2

LRSQX

C

LAMCX

R3

LAMRX

C

LSRCX

R3

LRSRX

F

LAMFX

R4

LAMSX

F

LRSFX

R4

LRSSX

F3

LRMAX

R5

LAMTX

F3

LRSOX

R5

LRSTX

I

LAMYX

R6

LAMHX

I

LRSYX

R6

LRSVX

P

LAMPX

P

LRSPX

Lord Abbett Growth Opportunities Fund

CLASS

TICKER

CLASS

TICKER

A

LMGAX

R2

LGOQX

C

LMGCX

R3

LGORX

F

LGOFX

R4

LGOSX

F3

LOMGX

R5

LGOTX

I

LMGYX

R6

LGOVX

P

LGOPX

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 each 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 Research Fund, Inc. is comprised of the following Funds:

Lord Abbett Dividend Growth Fund:

Dividend Growth Fund

Lord Abbett Growth Opportunities Fund:

Growth Opportunities Fund

Lord Abbett Small-Cap Value Series:

Small Cap Value 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

1933 Act

Securities Act of 1933, as amended

1940 Act

Investment Company Act of 1940, as amended

Board

Board of Directors

Board Member(s)

Director(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 Research Fund

Independent Board Member(s)

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

defined in the 1940 Act, of each Fund

Interested Board Member(s)

Director(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

Research Fund

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

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 and certain Funds’ name changes.

Registrant Organization

Registrant

Form of

Organization

Date of Organization

Number of

Funds

Shares Available

for Issuance

Research Fund

Maryland corporation

April 6, 1992

3

3.110 billion

shares, $0.001 par

value

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

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. 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, and (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 that 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, or (ii) own more than 10% of the voting securities

of such issuer;

5

7. 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); or

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.

5

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

Part I

3-2

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

6

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.

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.

6

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

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

33⅓%

of its total assets (including

the amount borrowed).

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.

Investment Type and Techniques

Divide

nd

Growth

Fund

Growth

Opportuniti

es Fund

Small

Cap

Value

Fund

Cash Balance Management Practices

X

X

X

Convertible Securities

X

X

X

Synthetic Convertible Securities

X

X

X

Contingent Convertibles Securities

Debt Securities

X

X

X

High-Yield or Lower-Rated Debt Securities

X*

X*

X*

Defaulted Bonds and Distressed Debt

Depositary Receipts

X

X

X

Derivatives

X

X

X

Combined Transactions

Commodity-Related Investments

Credit Derivatives

X

X

X

Forward Contracts

X

X

X

Futures Contracts

X

X

X

Options Contracts

X

X

X

Participation Notes

Swap Agreements

X

X

X

Equity Securities

X

X

X

Common Stocks

X

X

X

Initial Public Offerings

X

X

X

Master Limited Partnerships

Preferred Stocks

X

X

X

Warrants and Rights

X

X

X

Foreign Currency Transactions

X

X

X

Foreign Securities

X

X

X

Emerging Market Securities

X

X

X

Illiquid Securities

X

X

X

Inflation-Indexed Securities

Investments in Other Investment Companies

X

X

X

Part I

4-2

Investment Type and Techniques

Divide

nd

Growth

Fund

Growth

Opportuniti

es Fund

Small

Cap

Value

Fund

Loans

Mortgage-Related and Asset-Backed Securities

and Other Collateralized Obligations

Municipal Bonds

Non-U.S. Government and Supranational Debt Securities

Real Estate Investment Trusts

X

X

X

Short Sales

X

X

X

Structured Notes and Other Hybrid Instruments

X

X

X

U.S. Government Securities

X

X

X

When-Issued or Forward Transactions

X

Zero Coupon, Deferred Interest, Pay-In-Kind, and Capital

Appreciation Bonds

*The Fund may at times hold below investment grade securities (commonly referred to as “high-yield” or “junk” bonds) if it

purchased securities that were considered investment grade at their time of purchase and such securities subsequently are

downgraded.

Related Additional Investment Restrictions

In addition to the principal investment strategies (and related restrictions) discussed in each Funds’

prospectus, each Fund may use other investment techniques in seeking to achieve its investment

objective, as set forth in the table above. The applicable investment restrictions associated with such

other investment techniques are set forth below. Please see ‘‘Additional Information on Portfolio

Investments, Risks, and Techniques’’ in Part II of the SAI for more information on these and the other

investment techniques that may be used by the Funds.

Borrowing Money.

Each Fund may borrow money to the extent permitted by its investment policies and

restrictions and applicable law. When a Fund borrows money or otherwise leverages its portfolio, the

value of an investment in the Fund may be more volatile and other investment risks will tend to be

compounded.

Each Fund may engage in other transactions that may have the effect of creating leverage in the Fund’s

portfolio, including, by way of example, derivatives transactions and reverse repurchase agreements. A

Fund will generally not treat derivative transactions as borrowings of money.

Illiquid Securities.

Each Fund may invest up to 15% of its net assets in illiquid securities. An illiquid

security is a security that a Fund reasonably expects cannot be sold or disposed of in then-current market

conditions in seven calendar days or less without the sale or disposition significantly changing the market

value of the security. In determining the liquidity of an investment, a Fund may consider, among other

things, the relevant market, trading and investment specific considerations of the security, including

anticipated trading sizes.

Part I

5-1

5.

BOARD MEMBERS

The Board Members of the Registrant are also Board Members of each of the Lord Abbett Funds, which

collectively consist of 63 funds. For more information on the Board Members, please see the

“Management of the Funds” section of Part II.

Compensation

The following table sets forth the compensation accrued by the Registrant for the Independent Board

Members and the total compensation paid by all Lord Abbett Funds to the Independent Board Members,

including amounts payable but deferred at the option of each Independent Board Member. No Interested

Board Member or officer of the Lord Abbett Funds received any compensation from the Funds for acting

as a Board Member or officer. The Lord Abbett Funds currently do not offer a bonus, pension, profit-

sharing, or retirement plan.

Board Members

For the Fiscal Year Ended

November 30, 2024 Aggregate

Compensation Accrued by the

Registrant

1

Total Compensation Paid by the

Lord Abbett Funds

2

Evelyn E. Guernsey

$22,362

$630,000

Julie A. Hill

3

2,431

0

Kathleen M. Lutito

17,020

470,000

Peter J. McNamara

4

N/A

N/A

James M. McTaggart

5

16,114

445,000

Charles O. Prince

17,020

470,000

Karla M. Rabusch

17,408

480,000

Lorin Patrick Taylor Radtke

15,208

420,000

Leah Song Richardson

15,207

420,000

Mark A. Schmid

15,468

420,000

James L.L. Tullis

5

16,164

420,000

1

Independent Board Members’ fees, including attendance fees for Board and committee meetings, are allocated among all Lord

Abbett Funds based on the net assets of each Fund. A portion of the fees payable by each Fund to its Independent Board

Members may be deferred at the option of a Board Member under an equity-based plan (the “deferred compensation plan”) that

deems the deferred amounts to be invested in shares of the Registrant for later distribution to the Board Members. The total

deferred amounts for Ms. Guernsey, Ms. Hill, Ms. Lutito, Mr. McTaggart, Mr. Prince, Ms. Rabusch, Mr. Radtke, Ms. Richardson,

Mr. Schmid, and Mr. Tullis attributable to the Registrant are $0, $454, $2,431, $6,317, $16,193, $0, $7,604, $8,074, $0, and $939,

respectively.

2

The second column shows total compensation, including the types of compensation described in the “For the Fiscal Year Ended

November 30, 2024 Aggregate Compensation Accrued by the Registrant” column, accrued by all Lord Abbett Funds for the

calendar year ended December 31, 2024, including fees of Independent Board Members that have been deferred.

3

Ms. Hill retired as a Trustee/Director of the Lord Abbett Funds effective December 31, 2023.

4

Mr. McNamara was appointed as a Trustee/Director of the Lord Abbett Funds effective January 1, 2025.

5

Mr. McTaggart and Mr. Tullis retired as Trustees/Directors of the Lord Abbett Funds effective December 31, 2024.