ArcelorMittal — Regulatory Filings 2026

May 12, 2026

6-K 1 tm267064d2_6k.htm CURRENT REPORT OF FOREIGN ISSUER

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Field: Rule-Page

Field: /Rule-Page

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE SECURITIES EXCHANGE ACT OF 1934

Field: Rule-Page

Field: /Rule-Page

Dated May 12, 2026

Commission File Number: 001-35788

ARCELORMITTAL

(Translation of registrant’s name into English)

24-26, Boulevard d’Avranches

L-1160 Luxembourg

Grand Duchy of Luxembourg

(Address of principal executive office)

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 x Form 40-F ¨

Field: Page; Sequence: 1

Field: /Page

The following report on Form 6-K shall be deemed to be incorporated by reference in the registration statement on Form F-3 (No. 333-278551) of ArcelorMittal and the Prospectuses incorporated therein. ArcelorMittal is providing on this Form 6-K its results for the first quarter of 2026 in a format for incorporation by reference into a registration statement.

Exhibit Index

Exhibit No. Description

Exhibit 99.1 ArcelorMittal’s Results for the First Quarter of 2026

Field: Page; Sequence: 2

Field: /Page

SIGNATURE

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.

ARCELORMITTAL

Date: May 12, 2026

By: /s/ Henk Scheffer

Name: Henk Scheffer

Title: Company Secretary & Group Compliance & Data Protection Officer

Field: Page; Sequence: 3; Options: Last

Field: /Page