COMPANHIA SIDERÚRGICA NACIONAL

Publicly Held Company

Corporate Taxpayer ID 33.042.730/0001-04

NIRE 35300396090

NOTICE TO THE MARKET

Companhia Siderúrgica Nacional ("CSN" or "Company") (B3: CSNA3; NYSE: SID) informs its shareholders and the general market that the accident that occurred at the Presidente Vargas Plant ("UPV") last night was a result of the rupture of a pipeline in the Thermal Power Plant. The boiler associated with the said pipeline was out of operation at the time of the rupture, and there were no injuries or environmental impacts observed during the incident.

The pipeline is not an integral part of the steel production process, and there are no expected impacts on production.

The Company is investigating the causes of the incident and will keep its shareholders and the general market duly informed of any developments.

São Paulo, July 04, 2023.

Marcelo Cunha Ribeiro

Executive of Finance and Investor Relations

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CSN - Companhia Siderúrgica Nacional published this content on 04 July 2023 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 04 July 2023 13:13:09 UTC.