Chalmers is out of his depth, page-16

Arcelor and Mittal Steel[edit]On 18 February 2002, Arbed merged with the Spanish company Aceralia, of which it had owned 35% since 1997, and the French Usinor. The new group, headquartered in Luxembourg, took the name Arcelor. It became the largest steel company in the world.Mittal Steel announced a takeover bid for Arcelor in January 2006.[21] After long discussions, on 25 June 2006 Arcelor agreed to merge with the Anglo-Dutch group Lakshmi Mittal.[21]The new group, formed from the two largest steel producers in the world, took the name ArcelorMittal.[21] Its headquarters initially remained in the Avenue de la Liberté in Luxembourg.[21] The first factory worldwide to receive the name ArcelorMittal, was ArcelorMittal Dudelange. The group made about 6% of the world's steel in 2016.[22] (source Wikipedia)

Although ArcelorMittalit has plants all over Europe, it is based in Luxembourg and it is the biggest Steel maker in the world.