UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

For the month of July 2026

Commission File Number: 001-41639

SMX (SECURITY MATTERS) PUBLIC LIMITED COMPANY

(Exact Name of Registrant as Specified in Charter)

Mespil Business Centre, Mespil House

Sussex Road, Dublin 4, Ireland

Tel: +353-1-920-1000

(Address of Principal Executive Offices) (Zip Code)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F. Form 20-F ☒ Form 40-F ☐

This Report on Form 6-K of SMX (Security Matters) Public Limited Company (the “Company”) attaches as Exhibit 99.1 an update to the audited consolidated financial statements and related notes of the Company as of and for the fiscal year ended December 31, 2025 originally included in the Company’s Annual Report on Form 20-F, filed with the Securities and Exchange Commission (the “SEC”) on March 20, 2026, to reflect the subsequent 20:1 and 2.285:1 reverse stock splits, which went effective on May 11, 2026 and June 1, 2026, respectively.

The information included in this Report of Foreign Private Issuer on Form 6-K is hereby incorporated by reference into the registration statements on Form F-3 (File Numbers 333-294606 and 333-293520) and Form S-8 (File Numbers 333-288722, 333-290452 and 333-294122) of the Company (including any prospectuses forming a part of such registration statements), and shall be a part thereof from the date on which this report is filed, to the extent not superseded by documents or reports subsequently filed or furnished.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

Date: July 1, 2026