[1][5] The merger was consummated after Mittal Steel Company raised its bid for Arcelor and the Mittal family agreed to relinquish its controlling stake in the company and execute a standstill agreement not to acquire a controlling interest without approval from independent directors.

[9] In August 2007, the company acquired Sicartsa, operator of a plant in Mexico, from Grupo Villacero for $1.44 billion.

[14][15] In December 2008, the company sold the Bethlehem Steel plant in Lackawanna, New York and the Sparrows Point Mill to Severstal, to satisfy conditions for regulatory approval of the merger with Arcelor.

[26] In May 2013, the company sold a 15% interest in its Labrador Trough iron ore mining and infrastructure asset to Posco and China Steel for $1.1 billion.

[3] In February 2017, ArcelorMittal and Votorantim announced plans to combine their long steel operations in Brazil.

[41] In April 2017, the company sold Georgetown Steelworks in South Carolina to Sanjeev Gupta's Liberty House Group.

[42] In November 2018, a consortium led by ArcelorMittal acquired Ilva, owner of the Taranto steelworks in southern Italy, which has Europe's largest steel output, for €1.8 billion.

[43][44] ArcelorMittal accused the state of not investing the agreed-upon amount and, in February 2024, Italy's industry minister took control of the venture in a manner similar to a bankruptcy, after an increase in energy prices and a drop in rolled steel coil prices led the venture to accumulate huge debts.

[46] In July 2019, the company sold seven major steelworks and five service centers in seven European countries to Sanjeev Gupta's Liberty House Group.

[56][57] In July 2022, the company acquired an 80% interest in Voestalpine's hot-briquetted iron plant near Corpus Christi, Texas, based on a $1 billion valuation.

[59] In March 2023, the company acquired Companhia Siderúrgica do Pecém, owner of a 3-million-metric-ton blast furnace and slab plant in northeastern Brazil, for $2.2 billion.

[61] In December 2023, the company sold its assets in Kazakhstan, the Temirtau steel mill and the Aktau pipe plant, for $286 million to a Kazakh state-owned investment fund.

[85][86][87][88][89][90] Following an investigation first launched in 2008, in August 2016 the Competition Commission (South Africa) found the company guilty of price fixing.

[93] The company entered into a $2.2 billion contract to develop an iron ore deposit in Senegal, including construction of a 750 km (466 mi) railway line.

In June 2014, the International Chamber of Commerce's arbitration court in Paris awarded Senegal $150 million.