July 19, 2006 — Mittal Steel Co. NV announced that the minimum tender condition of the offer (i.e., 50% of Arcelor outstanding shares on a fully diluted basis) has been met, based on statements made by financial intermediaries.

Mittal notes that the global centralizing agent for the Offer is still in the process of verifying and
counting the Arcelor securities tendered in the Offer.

The global centralizing agent for the Offer will continue the process of verifying the tender information centralized from all the jurisdictions where the offer has been made (i.e., Belgium, France, Luxembourg, Spain and the U.S.), further counting the tendered Arcelor securities and completing the pro-ration procedure among each of the secondary cash and exchange offers in order to calculate the aggregate final results of the offer, broken down by type of offer. The final results of the offer will be published on July 26, 2006.

Mittal further notes that no offer to exchange or purchase any Arcelor shares or convertible bonds has been or will be made in The Netherlands or in any jurisdiction other than Luxembourg, Belgium, Spain, France and the United States. The company also cautions that this announcement does not constitute an offer to exchange or purchase any Arcelor shares or convertible bonds.

Mittal Steel has operations in sixteen countries, on four continents. Mittal Steel encompasses all aspects of modern steelmaking, to produce a comprehensive portfolio of both flat and long steel products to meet a wide range of customer needs. It serves all the major steel consuming sectors, including automotive, appliance, machinery and construction. For 2005, Mittal Steel had revenues of US$28.1 billion and steel shipments of 49.2 million tons.