Prospectus Certification by Investment Company - Form 497J

Untitled Document

LORD ABBETT MID CAP STOCK FUND, INC.
90 Hudson Street
Jersey City, New Jersey 07302-3973

May 1, 2024

VIA EDGAR

U.S. Securities and Exchange Commission
Division of Investment Management
100 F Street, NE
Washington, D.C. 20549-4720

Re: Lord Abbett Mid Cap Stock Fund, Inc. (the "Registrant")
1933 Act File No. 002-82544
1940 Act File No. 811-03691

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:

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. 60 to the Registrant's Registration Statement on Form N-1A filed by the Registrant on April 25, 2024; and

2.the text of Post-Effective Amendment No. 60, which was the most recent Amendment to the Registration Statement, was filed electronically with the U.S. Securities and Exchange Commission on April 25, 2024.

Sincerely,

/s/Victoria Zozulya
Victoria Zozulya
Vice President and Assistant Secretary
Lord Abbett Family of Funds

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