Notification of share transactions by Lumen Investments S.à r.l

Luxembourg, 16 October 2026, 18:00 CET

With reference to Article 19(3) of Regulation (EU) No 596/2014 of the European Parliament and of the Council of 16 April 2014 on market abuse (Market Abuse Regulation), ArcelorMittal announces that notifications of share transactions by Lumen Investments S.à r.l., an entity forming part of the Significant Shareholder structure, are available in the Luxembourg Stock Exchange's electronic database OAM on www.bourse.lu and on ArcelorMittal's website www.arcelormittal.com under Investors > Share Transactions by Management: https://corporate.arcelormittal.com/investors/corporate-governance/share-transactions-by-management.

About ArcelorMittal

ArcelorMittal is one of the world's leading steel and mining companies, with a presence in 60 countries and primary steelmaking facilities in 14 countries. In 2025, ArcelorMittal had revenues of $61.4 billion and crude steel production of 55.6 million metric tonnes, while iron ore production reached 48.8 million metric tonnes.

Our goal is to help build a better world with smarter steels. Steels made using innovative processes which use less energy, emit significantly less carbon and reduce costs. Steels that are cleaner, stronger and reusable. Steels for electric vehicles and renewable energy infrastructure that will support societies as they transform through this century. With steel at our core, our inventive people and an entrepreneurial culture at heart, we will support the world in making that change. This is what we believe it takes to be the steel company of the future.

ArcelorMittal is listed on the stock exchanges of New York (MT), Amsterdam (MT), Paris (MT), Luxembourg (MT) and on the Spanish stock exchanges of Barcelona, Bilbao, Madrid and Valencia (MTS). For more information about ArcelorMittal please visit: https://corporate.arcelormittal.com/

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