Exhibit 99.1

press release

ArcelorMittal announces financial calendar for 2021

7 December 2020, 18:00 CET

ArcelorMittal today announces its financial calendar for 2021.

Earnings results announcements:

• 11 February 2021: Q4 and full year 2020

• 6 May 2021: Q1 2021

• 29 July 2021: Q2 and half year 2021

• 4 November 2021: Q3 2021

Annual General Meeting of Shareholders:

• 4 May 2021

ENDS