Company: MT
Filing Date: 2025-04-30
Form Type: 6-K
Source: 0001999371-25-005072
Chunk: 0

Company: ArcelorMittal
Filing Date: 2025-04-30
Form: 6-K
Chunk 0
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<div align='center'>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

Dated April 30, 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.</div>

| Form 20-F ☒ | Form 40-F ☐ |

On April 30, 2025, ArcelorMittal published the press release attached hereto as Exhibit 99.1 and hereby incorporated by reference into this report on Form 6-K.

<div align='center'>Exhibit Index</div>

| Exhibit No.  | Description                                      |
| Exhibit 99.1 | ArcelorMittal reports first quarter 2025 results |

<div align='center'>SIGNATURES</div>

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 30 April 2025 |                                                                |     |               |
| By:                | /s/ Henk Scheffer                                              |     |               |
| Name:              | Henk Scheffer                                                  |     |               |
| Title:             | Company Secretary & Group Compliance & Data Protection Officer |     |               |