ArcelorMittal S.A.
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ArcelorMittal's story is the most unlikely rise in modern heavy industry: its founder Lakshmi Mittal started with a small steel mill his family bought in Indonesia in 1976, then spent three decades buying struggling steel companies — from Trinidad to Kazakhstan to Mexico — and turning them around. The 2006 merger of his Mittal Steel with Europe's Arcelor created the world's largest steel company, and no rival has come close since.
The company produces roughly 60 million tonnes of steel a year — more than any other company on earth — across mines, steel plants, and finishing facilities in 60+ countries. Its products range from construction steel (rebar, beams, and the steel plate in skyscrapers and bridges) to premium automotive steel, electrical steel for transformers, and the high-strength grades used in wind towers and pipelines.
Headquartered in Luxembourg with about 190,000 employees and annual revenue near US$70 billion, ArcelorMittal is now leading the industry's decarbonization push — investing billions in hydrogen-based direct reduced iron (DRI) plants that aim to make steel without coal, including the world's first full-scale DRI project in Hamburg. For industrial buyers, its scale means supply security unmatched in the steel world; for the planet, its decarbonization bet is one of the most consequential industrial experiments underway.
