ArcelorMittal (NYSE: MT) discloses 2026 calendar and designated person

Rhea-AI Filing Summary

ArcelorMittal filed a report as a foreign private issuer that mainly makes two recent press releases part of its official disclosures.

One press release, dated December 12, 2025, announces ArcelorMittal’s financial calendar for 2026, and the other, dated December 16, 2025, is a Designated Person Notification. Both are attached as exhibits and incorporated by reference into this report.

UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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FORM 6-K

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

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Dated December 16, 2025

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 ☒        Form 40-F ☐

On December 12, 2025 and December 16, 2025, ArcelorMittal published the press releases attached hereto as Exhibit 99.1 and Exhibit 99.2 and hereby incorporated by reference into this report on Form 6-K.

Exhibit Index

Exhibit No. Description

Exhibit 99.1			Press release dated December 12, 2025, ArcelorMittal announces its financial calendar for 2026
Exhibit 99.2			Press release dated December 16, 2025, Designated Person Notification

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.

ARCELORMITTAL

Date 16 December 2025

By: /s/ Henk Scheffer    

Name: Henk Scheffer

Title: Company Secretary & Group Compliance & Data Protection Officer

FAQ

What does ArcelorMittal (MT) disclose in this latest SEC report?

ArcelorMittal incorporates by reference two December 2025 press releases: one announcing its 2026 financial calendar and another providing a Designated Person Notification.

What is the ArcelorMittal 2026 financial calendar press release about?

The press release attached as Exhibit 99.1, dated December 12, 2025, announces ArcelorMittal’s financial calendar for 2026.

What is the Designated Person Notification mentioned by ArcelorMittal (MT)?

The Designated Person Notification is a press release dated December 16, 2025, attached as Exhibit 99.2 and incorporated into the report.

How are the press releases treated in ArcelorMittal’s SEC reporting?

Both press releases are attached as Exhibits 99.1 and 99.2 and are incorporated by reference into the report as part of ArcelorMittal’s official disclosures.

When were the ArcelorMittal (MT) press releases referenced in this report published?

The financial calendar press release was published on December 12, 2025, and the Designated Person Notification on December 16, 2025.