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.