Notice to the Market – Share Buyback Program

Rua São José nº 20, Grupo 1602, parte
Rio de Janeiro/RJ
Corporate Taxpayer‘s ID (CNPJ/MF): 33.042.730/0001-04
The Board of Directors of COMPANHIA SIDERÚRGICA NACIONAL authorized the acquisition of up to 10,800,000 Company’s shares to be held in treasury for subsequent sale or cancellation.

The acquisition shall obey the following limits and conditions, pursuant to CVM Instruction 10/80:

I – The Company’s objective: to maximize the creation of shareholder value through efficient capital structure management.

II – Number of shares to be acquired: up to 10,800,000 shares.

III – Maximum term for the completion of the authorized operations: from August 4, 2008, inclusive, to August 27, 2008.

IV – Number of shares outstanding: 455,343,843

V – Acquisition location: Stock Exchange

VI – Maximum share price: the share acquisition price cannot exceed its stock market price.

VII – Brokers: Itaú Corretora de Valores S.A., located at Av. Engenheiro Armando de Arruda Pereira, 707 -15º andar- in the city of São Paulo, UBS Pactual Corretora de Mercadorias Ltda., located at Av. Brigadeiro Faria Lima, 3729 – 10º andar – in the city of São Paulo, Credit Suisse First Boston CTVM S.A., located at Av. Brigadeiro Faria Lima 3064 – 13º andar- in the city of São Paulo, and Itaú USA Securities Inc., located at 540 Madison Avenue – 23rd Floor- in New York city.

Rio de Janeiro, Brazil, August 4th, 2008.

Companhia Siderúrgica Nacional
Otávio de Garcia Lazcano
Investor Relations Executive Officer