COMPANHIA SIDERÚRGICA NACIONAL

Publicly Held Company

Corporate Taxpayer ID (CNPJ/ME) nº 33.042.730/0001-04

Notice to the Market

Companhia Siderúrgica Nacional ("CSN"), informs that:

1- On June 4, 2021, CSN and its subsidiary Minérios Nacional S.A. ("Minérios Nacional") received a subpoena for Public Civil Action number 5076462-66.2021.8.13.0024, from the 4th Court of Public Finance and Municipalities of the District of Belo Horizonte, filed by the State of Minas Gerais, through the Attorney General of the State of Minas Gerais, containing an injunction handed down by the Judge on duty of the Court of Justice, on the holiday of June 3, 2021.

2- In summary, the State of Minas Gerais, filed the aforementioned statement, alleging instability and risk of disruption in the structure of B2 Auxiliar Dam ("Dam B2A") of the Fernandinho mine, owned by Minérios Nacional.

3- The injunction granted establishes certain obligations to do, to be met within periods of up to 5 and 30 days, none of which implies the suspension of the activities of the Fernandinho mine or any other unit of CSN, or of Minérios Nacional. The Companies will declare their answers and take the legal actions applicable within the legal deadlines.

4- The B2A Dam, altered by the upstream method, has been, since July/2019, undergoing groundwater lowering works, which consist in the removal of underground water from the dam, in order to make it even safer, and later, will start the mischaracterization process. However, the works at the B2A Dam are at a standstill as determined by the National Mining Agency, for inquiries.

5- The B2A Dam is classified as emergency level 2 and the required works were being carried out as determined by the designer company, with all recommended safety instructions. Therefore, it presents no risk in the scales mentioned in the Public Civil Action, which will be duly proven to the authorities.

6- It is important to note that the B2A Dam does not involve risks to the population because the residents of the Auto Rescue Zone have already been relocated, nor does it represent relevant impacts on the production of the Companies.

7- The Companies confirm their performance based on legality and reiterate their commitment to adopt all the necessary legal measures to ensure the full operation of their operations, the safety of the population and environmental preservation.

CSN will keep the market informed about any developments of this fact.

São Paulo, June 4, 2021.

Marcelo Cunha Ribeiro

Executive Director of Investor Relations

Companhia Siderúrgica Nacional

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CSN - Companhia Siderúrgica Nacional published this content on 04 June 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 05 June 2021 00:06:04 UTC.