July 6, 2006 — Mittal Steel Co. NV announced that the Luxembourg Commission de Surveillance du Secteur Financier (CSSF), the Belgian Commission Bancaire, Financiere et des Assurances (CBFA), the Spanish Comision Nacional del Mercado de Valores (CNMV) and the French Autorite des marches financiers (AMF) approved the second Information Document Supplement relating to Mittal Steel's recommended offer for Arcelor on July 4, 2006.

The company says that the Dutch Autoriteit Financiele Markten (AFM) has also approved a third Share Prospectus Supplement.

Arcelor will soon publish a response prospectus containing the unanimous recommendation of Arcelor's board of directors relating to Mittal Steel's offer. The acceptance period, during which shareholders may tender their shares into the offer, will last until July 13, 2006 (inclusive). Depending on the duration of the centralization process, the results of the offer should be announced on July 26, 2006, and the settlement and delivery of the offered shares and cash should occur on August 1, 2006.

The company 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.