6-K

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 15, 2017

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 offices)

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

Form 20-F ☒ Form 40-F ☐

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): _____

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): _____

On December 15, 2017, ArcelorMittal issued the press release attached hereto as Exhibit 99.1 and hereby incorporated by reference into this report on Form 6-K.

Exhibit List

Exhibit No.	Description
Exhibit 99.1	Press release dated December 15, 2017, reporting that ArcelorMittal has extended the conversion date for its $1 billion mandatory convertible bond.

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 15 December 2017

By:  /s/ Henk Scheffer        

Name: Henk Scheffer

Title: Company Secretary & Group Compliance & Data Protection Officer

Exhibit Index

Exhibit No.	Description
Exhibit 99.1	Press release dated December 15, 2017, reporting that ArcelorMittal has extended the conversion date for its $1 billion mandatory convertible bond.

EX-99.1

press release

ArcelorMittal extends conversion date for $1bn mandatory convertible bond

15 December 2017 – ArcelorMittal announces the extension of the conversion date for the $1bn privately placed mandatory convertible bond (MCB) issued on 28 December 2009 by one of its wholly-owned Luxembourg subsidiaries. This amendment to the MCB, which is mandatorily convertible into preferred shares of such subsidiary, was executed on 14 December 2017. The mandatory conversion date of the bond has been extended to 29 January 2021. The other main features of the MCB remain unchanged. The bond was placed privately with Credit Agricole Corporate and Investment Bank and is not listed.

The subsidiary has simultaneously executed amendments providing for the extension of the outstanding notes into which it invested the proceeds of the bond issuance, which are linked to shares of the listed companies Eregli Demir Va Celik Fab. T. AS of Turkey and China Oriental Group Company Limited, both of which are held by ArcelorMittal subsidiaries.