# EDGAR Filing Document

**Accession Number:** 0000276914
**File Stem:** 0000930413-25-003548
**Filing Date:** 2025-12
**Character Count:** 3200
**Document Hash:** 9c8fe4c15466985611b2eca45c251dd7
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000930413-25-003548.hdr.sgml**: 20251201

**ACCESSION NUMBER**: 0000930413-25-003548

**CONFORMED SUBMISSION TYPE**: 497J

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20251201

**DATE AS OF CHANGE**: 20251201

**EFFECTIVENESS DATE**: 20251201

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** LORD ABBETT DEVELOPING GROWTH FUND, INC.
- **CENTRAL INDEX KEY:** 0000276914

**ORGANIZATION NAME:**
- **EIN:** 132958970
- **STATE OF INCORPORATION:** MD
- **FISCAL YEAR END:** 0731

**FILING VALUES:**
- **FORM TYPE:** 497J
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-62797
- **FILM NUMBER:** 251538081

**BUSINESS ADDRESS:**
- **STREET 1:** 30 HUDSON ST.
- **CITY:** JERSEY CITY
- **STATE:** NJ
- **ZIP:** 07302
- **BUSINESS PHONE:** 201-827-2000

**MAIL ADDRESS:**
- **STREET 1:** 30 HUDSON ST.
- **CITY:** JERSEY CITY
- **STATE:** NJ
- **ZIP:** 07302

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** LORD ABBETT DEVELOPING GROWTH FUND INC /NEW/
- **DATE OF NAME CHANGE:** 19920703

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** DEVELOPING GROWTH SHARES INC
- **DATE OF NAME CHANGE:** 19600201

## Series and Classes Contracts Data

### LORD ABBETT DEVELOPING GROWTH FUND INC (Series ID: S000006834)

| Class ID   | Class Name   | Ticker Symbol   |
|:---|:---|:---|
| C000018473 | Class A      | LAGWX           |
| C000018475 | Class C      | LADCX           |
| C000018476 | Class P      | LADPX           |
| C000018477 | Class I      | LADYX           |
| C000054855 | Class F      | LADFX           |
| C000054856 | Class R2     | LADQX           |
| C000054857 | Class R3     | LADRX           |
| C000151972 | Class R4     | LADSX           |
| C000151973 | Class R5     | LADTX           |
| C000151974 | Class R6     | LADVX           |
| C000188220 | Class F3     | LOGWX           |

#### LORD ABBETT DEVELOPING GROWTH FUND, INC. <br> 30 Hudson Street <br> Jersey City, New Jersey 07302-4804
December 1, 2025

#### <br> VIA EDGAR
U.S. Securities and Exchange Commission<br>Division of Investment Management<br>100 F Street, NE<br>Washington, D.C. 20549-4720

Re: Lord Abbett Developing Growth Fund, Inc. (the "Registrant")<br> 1933 Act File No. 002-62797<br> <u>1940 Act File No. 811-02871</u>

Ladies/Gentlemen:

In accordance with the provisions of Rule 497(j) under the Securities Act of 1933, as amended (the "Securities Act"), the undersigned hereby certifies that:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;1. the form of prospectus and statement of additional information that would have been filed under Rule 497(c) under the Securities Act would not have differed from that contained in Post-Effective Amendment No. 78 to the Registrant's Registration Statement on Form N-1A filed by the Registrant on November 26, 2025; and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;2. the text of Post-Effective Amendment No. 78, which was the most recent Amendment to the Registration Statement, was filed electronically with the U.S. Securities and Exchange Commission on November 26, 2025.

Sincerely,

<u>/s/Christian J. Corkery</u><br>Christian J. Corkery<br>Vice President and Assistant Secretary<br>Lord Abbett Funds

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