LONDON, March 6 /PRNewswire-FirstCall/ -- Mittal Steel Company (NYSE: MT ; Euronext Amsterdam: MT), the world's largest and most global steel company, will be holding an investor day in Rotterdam on 9th March 2006 and in Chicago on 14th & 15th March 2006. Presentations will be given by senior executives from Mittal Steel on the company and on the steel industry. All the presentations will be available on the Mittal Steel website http://www.mittalsteel.com/. No new financial information will be disclosed. During the visit in Chicago investors will be taken to Mittal Steel's Burns Harbour plant. The Burns Harbor facility is one of Mittal Steel's largest facilities in the USA and is a fully integrated steel-making facility primarily serving the automotive market. If you are an institutional investor or an analyst and you would like to join us in Rotterdam or Chicago, please see contact details below. Please register to confirm your place at Rotterdam with: Gita Stuart-Janki Mittal Steel Holdings B.V. Hofplein 20, Rotterdam, The Netherlands Phone: +31-102-179-626 Fax: +31-102-178-850 E-mail: Please register to confirm your place at Chicago with: Jolynn Bryant Kelly Mittal Steel USA 1 South Dearborn Street, Chicago, USA Phone: +1-312-899-3569 Fax: +1-312-899-3678 E-mail: About Mittal Steel Mittal Steel Company is the world's largest and most global steel company. The company 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. The company trades on the New York Stock Exchange and the Euronext Amsterdam under the ticker symbol "MT". DATASOURCE: Mittal Steel Company N.V. CONTACT: Selina Vaccarino, Mittal Steel Company NV, +44 -0)20-7543-1156,

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