| Year | Detail |
| 2006 |
ArcelorMittal, a steel-making company, was established from the merger of Arcelor and Mittal Steel. The merger was achieved through a tender offer by Mittal Steel for Arcelor shares. |
| 2008 |
ArcelorMittal acquired Unicon, a manufacturer of welded steel pipes in Venezuela, to strengthen its welded steel pipes business in South America. |
| 2011 |
ArcelorMittal spun off its stainless and specialty steel business, creating a new company named Aperam. |
| 2013 |
ArcelorMittal partnered with Nippon Steel Corporation (NSC) to acquire ThyssenKrupp Steel USA in Calvert, Alabama, for $1,550 million. |
| 2021 |
ArcelorMittal and SEKISUI CHEMICAL partnered on a project to capture and reuse carbon waste gases from the steelmaking process, reducing dependence on fossil resources and contributing to the decarbonisation of steelmaking. |
| 2022 |
ArcelorMittal acquired Dutch scrap metal recycling business Riwald Recycling and Polish scrap metal recycling business Zlomex. |
| 2023 |
Schneider Electric partnered with ArcelorMittal on low-carbon steel to reduce the environmental impact of its products. ArcelorMittal supplies Schneider Electric with XCarb recycled and renewably produced steel for its electrical cabinets and enclosures. |
| 2024 |
HP, a printing company in additive manufacturing, collaborated with ArcelorMittal to advance the field of steel additive manufacturing. |