Arcelormittal : ArcelorMittal Share Buyback Program: Status Report as of September 24

Regulatory News:

ArcelorMittal, under the new share buy-back program as announced on 13 September 2007, hereby announces that it has repurchased 4,175,000 shares from 13 September until 19 September 2007.

The shares were repurchased at an average price of EUR 48.6465 and for a total amount of EUR 203,099,040.00.

For more information on the share buy-back program see the Corporate Governance section under Investors & Shareholders on the ArcelorMittal website at www.arcelormittal.com.

About ArcelorMittal

ArcelorMittal is the world's number one steel company, with 320,000 employees in more than 60 countries. The company brings together the world's number one and number two steel companies, Arcelor and Mittal Steel.

ArcelorMittal is the leader in all major global markets, including automotive, construction, household appliances and packaging, with leading R&D and technology, as well as sizeable captive supplies of raw materials and outstanding distribution networks. An industrial presence in 27 European, Asian, African and American countries exposes the company to all the key steel markets, from emerging to mature, positions it will be looking to develop in the high-growth Chinese and Indian markets.

ArcelorMittal key pro forma financials for 2006 show combined revenues of USD 88.6 billions, with a crude steel production of 118 million tonnes, representing around 10 per cent of world steel output.

ArcelorMittal is listed on the stock exchanges of New York (MT), Amsterdam (MT), Paris (MTP), Brussels (MTBL), Luxembourg (MT) and on the Spanish stock exchanges of Barcelona, Bilbao, Madrid (MTS) and Valencia.

ArcelorMittal Investor Relations
Continental Europe [phone]
UK/Asia/Africa [phone]
Americas [phone]
Retail [phone]
Bonds/Credit [phone]
ArcelorMittal Communications
E-mail:
[e-mail]
Phone: [phone]
ArcelorMittal Corporate Communications
Nicola Davidson [phone] / 1172
Jean Lasar [phone]
Maitland Consultancy:
Tom Siveyer / Martin Leeburn [phone]
Belgium
Charles-Hubert Gernaert, Comfi, [phone]
North America
Bill Steers [phone]
Netherlands
Leon Melens, Smink, Van der Ploeg & Jongsma,
[phone]
Germany
Phoebe Kebbel, Herring Schuppener, [phone]
France
Sandra Luneau [phone]
Anne France Malrieu / Grégoire Lucas,
Image 7 [phone]
Spain
Ignacio Agreda [phone]
Oscar Fleites [phone]
Keith Grant [phone]