Mittal Steel Co. NV and International Steel Group Inc. have clarified the deadline for ISG stockholders to submit forms of election regarding the stock and cash consideration they elect to receive for their shares of ISG common stock. The election relates to the proposed merger of ISG with a wholly owned subsidiary of Mittal Steel.

The deadline for holders of record of ISG shares will be 5:00 p.m. on the third business day after the merger is completed. ISG stockholders who hold their shares in "street name" may be required to submit their election forms earlier than the deadline applicable to holders of record. Such stockholders should carefully review any materials they received from their broker to determine the election deadline applicable to them.

The Extraordinary General Meeting of Mittal Steel Shareholders and the Special Meeting of ISG Stockholders have been scheduled for April 12, 2005. During these meetings, Mittal Steel shareholders and ISG stockholders will vote on the merger agreement. Mittal Steel and ISG intend to complete the merger as promptly as practicable following satisfaction of all conditions to completion of the merger. As a result, the earliest possible expiration date for an ISG stockholder to submit a form of election is 5:00 p.m. on Friday, April 15, 2005 (which would be the case if Mittal Steel and ISG were to complete the merger on Tuesday, April 12, 2005).

Mittal Steel and International Steel Group urge all ISG stockholders to submit their forms of election as soon as possible in order to ensure that their elections are effective. ISG stockholders may elect cash, Mittal Steel Class A Common Shares, or a combination of the two for their ISG shares. All elections are subject to proration procedures provided in the merger agreement designed to ensure that, in the aggregate, 50% of the ISG shares will be converted into cash and 50% of the ISG shares will be converted into Mittal Steel Class A Common Shares. As a result, an ISG stockholder may not receive the exact form of consideration elected, and the ability of an ISG stockholder to receive the form of consideration elected will depend on the elections made by other ISG stockholders.

ISG stockholders may obtain additional copies of the election documents, as well as copies of the March 14, 2005 proxy statement/prospectus from MacKenzie Partners, Inc.

Mittal Steel Co. is the world's most global steel company. Formed from the combination of Ispat International NV and LNM Holdings NV, the company has operations in fourteen 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 in all the major steel consuming sectors, including automotive, appliance, machinery and construction. For 2004, Mittal Steel had revenues of US$22.2 billion and steel shipments of 42.1 million tons.

International Steel Group Inc. is one of the largest steel producers in North America. It ships a variety of steel products from 13 major steel producing and finishing facilities in eight states, including hot-rolled, cold-rolled and coated sheets, tin mill products, carbon and alloy plates, rail products and semi-finished shapes to serve the automotive, construction, pipe and tube, appliance, container and machinery markets.