June 9, 2006 — Mittal Steel Co. NV announced that the Canadian Competition Bureau has confirmed that it will not challenge Mittal Steel’s bid to acquire Arcelor SA. The clearance is unconditional.

The Canadian Competition Bureau’s decision follows the granting of EU antitrust clearance on June 2, 2006, and expiry of the waiting period under the U.S. Hart-Scott-Rodino Antitrust Improvements Act of 1976 on May 11, 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 Belgium, France, Luxembourg, Spain and the United States.

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.