COMPANHIA SIDERÚRGICA NACIONAL

Publicly-Held Company

Corporate Taxpayer's ID (CNPJ/MF): 08.902.291/0001-15

Company Registry (NIRE): 31300025144

MATERIAL FACT

Companhia Siderúrgica Nacional ("CSN" or "Company") (B3: CSNA3) in conformity with the provisions of the Instruction No. 358/2002 of the Comissão de Valores Mobiliários ("CVM") hereby announces to its shareholders and the market in general, as approved during a Meeting of the Company's Board of Directors ("RCA"), held on June 21, 2021, the Share Buyback Program ("Share Buyback Program") for the acquisition of 24,154,500 (twenty-four million, one hundred and fifty-four thousand and five hundred) common shares issued by the Company from June 22, 2021 to December 21, 2022. The Share Buyback Program will be executed as described in Annex I from RCA.

The Share Buyback Program aims to acquire common shares, nominative shares, book-entry shares and shares without nominal value issued by the Company itself. Respecting the legal limits and based on available resources, for permanence in treasury and subsequent disposal or cancellation, pursuant to the provisions of Article 3 of CVM Instruction No. 567/2015.

São Paulo, June 21, 2021.

COMPANHIA SIDERÚRGICA NACIONAL

Marcelo Cunha Ribeiro

Executive Director of Finance and Investor Relations

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CSN - Companhia Siderúrgica Nacional published this content on 21 June 2021 and is solely responsible for the information contained therein. Distributed by Public, unedited and unaltered, on 21 June 2021 23:18:02 UTC.