Table of Contents

Company Information / Capital Breakdown

Companhia Siderúrgica Nacional “CSN”, also referred to as the “Company”, is a publicly held company incorporated on April 9, 1941, under the laws of the Federative Republic of Brazil (Companhia Siderúrgica Nacional, its subsidiaries, joint ventures, joint operations and associates are collectively referred to herein as the "Group”). The Company’s registered office is located in São Paulo, SP, Brazil.

CSN is listed on the São Paulo Stock Exchange (B3 S.A.- Brasil, Bolsa, Balcão) and on the New York Stock Exchange (NYSE).

The Group's main operating activities are divided into five (5) segments as follows:

The Company’s main industrial facility is the Presidente Vargas steelworks (“UPV”), located in the city of Volta Redonda, State of Rio de Janeiro. This segment consolidates all operations related to the production, distribution and sale of flat steel, long steel, metallic containers and galvanized steel. In addition to the facilities in Brazil, CSN has commercial operations in the United States and operations in Portugal and Germany to achieve markets and providing excellent services for final consumers. Its steel is used in home appliances, civil construction and automobile industries.

The production of iron ore is developed in the cities of Congonhas, Ouro Preto and Belo Vale, State of Minas Gerais – by subsidiary CSN Mineração.

Iron ore is sold basically in the international market, especially in Europe and Asia. The prices charged in these markets are historically cyclical and subject to significant fluctuations over short periods of time, driven by several factors related to global demand, strategies adopted by the major steel producers, and the foreign exchange rate. All these factors are beyond the Company’s control. The ore transportation is carried out through Terminal de Carvão e Minérios do Porto de Itaguai – (“TECAR”), a solid bulk terminal, one of the four terminals that comprise the Port of Itaguai, located in the State of Rio de Janeiro. Imports of coal and coke are also carried out through this terminal by provision of services by CSN Mineração to CSN. The Company´s mining activities also comprises tin exploitation, which is based in the State of Rondônia, to supply the needs of UPV. The excess of raw material is sold to subsidiaries and third parties.

As a pioneer in the use of technologies that result in the possibility of stacking the tailings generated in the iron ore production process, the Company has had its iron ore production since January 2020, 100% independent of tailings dams. After significant investments in recent years to raise the level of reliability, mischaracterization and dry stacking, the Company has moved on to a scenario in which 100% of its waste goes through a dry filtration process and is disposed of in geotechnically controlled batteries, areas exclusively destined for stacking. Approximately R$250 million was invested in the two tailings filtration plants that have a combined total filtration capacity of 9 million tons per year.

As a consequence of these measures, the decommissioning of the dams is the natural way of processing dry waste.

All of our mining dams are positively certified and comply with the environmental legislation in force.

CSN entered the cement production market, catapulted by the synergy between this activity and CSN's current business. Beside the UPV facilities, in Volta Redonda / RJ, the Company installed a new business unit, which produces CP-III type cement using the slag produced by the UPV’s own blast furnaces. It also explores limestone and dolomite at the Arcos / MG unit, to meet the needs of the UPV and the cement plant. Additionally, in Arcos / MG, the clinker production operation is located. As a result, the Company is self-sufficient in the production of cement, with an installed capacity of 4.7 million tons per year.

On January 31, 2021, the Company concluded the drop down of the cement segment and, accordingly, all assets and liabilities related to the cement business were transferred from CSN to its subsidiary recently incorporated CSN Cimentos S.A. (“CSN Cimentos”) see the note 11.c.

On August 31, 2021, the Company completed the acquisition of control of Elizabeth Cimentos S.A. ("Elizabeth Cimentos") and Elizabeth Mineração S.A. ("Elizabeth Mineração"), as detailed in note 4 - Business Combination. With the closing of the transaction, CSN Cimentos now has a total capacity of 6 million tons per year

On September 9, 2021 a Purchase and Sale Agreement was signed for the acquisition of 100% of LafargeHolcim's operations in Brazil. With the closing of the transaction, CSN Cimentos will have a total capacity of 16.3 million tons per year. The deal was valued at US$1.025 billion, and the closing of the operation, which involves cash payment, is subject to approval by the competition authority. On the same date, the Company deposited in an Escrow Account with Banco Santander, the amount of US$50 million, equivalent to R$263.7 million, as part of the negotiations for the acquisition of LafargeHolcim.

Railroads:

CSN has interests in three railroad companies: MRS Logística S.A., which manages the former Southeast Railway System of Rede Ferroviária Federal S.A (“RFFSA”)., Transnordestina Logística S.A. (“TLSA”) and FTL - Ferrovia Transnordestina Logística S.A. (“FTL”), which the the latter two hold the concession to operate the former Northeast Railway System of RFFSA, in the States of Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, Alagoas and Sergipe, with TLSA being responsible for the rail links of Eliseu Martins – Trindade, Trindade – Salgueiro, Salgueiro – Porto Suape, Salgueiro – Missão Velha and Missão Velha - Pecém (Railway System II), under construction, and FTL being responsible for the rail links of São Luis - Altos, Altos - Fortaleza, Fortaleza – Souza, Souza - Recife/Jorge Lins, Recife/Jorge Lins – Salgueiro, Jorge Lins – Propriá, Paula Cavalcanti – Cabedelo, Itabaiana - Macau (Railway System I).

Ports:

The Company operates in the State of Rio de Janeiro, by means of its subsidiary Sepetiba Tecon S.A., operates the Container Terminal (“TECON”) and by means of its subsidiary CSN Mineração, the TECAR, both located at the Itaguaí Port. Established in the harbor of Sepetiba, the mentioned port has a privileged highway, railroad and maritime access.

(“TECON”) is responsible for the shipments of CSN´s steel products, movement and storage of containers, vehicles, general cargo, among other products; and TECAR performs the operational activities of loading and unloading of solid bulk ships, storage and distribution (road and rail) of coal, coke, zinc concentrate, sulfur, iron ore and other bulk, intended for the seaborne market, for our own operation and for third parties.

Since the energy supply is fundamental in CSN´s production process, the Company owns and operates facilities to generate electric power for guaranteeing its self-sufficiency.

The consolidated and parent company condensed interim financial information (“condensed quarterly information”) have been prepared and are being presented in accordance with accounting practices adopted in Brazil based on the provisions of the Brazilian Corporate Law, pronouncements, guidelines and interpretations issued (CPC), approved by CVM, besides the own standards issued by the Brazilian Securities and Exchange Commission (“CVM”) and International Financial Reporting Standards (“IFRS”) issued by the International Accounting Standard Board (IASB) and highlight all the relevant information of the interim financial statements, and only this information, is being disclosed and corresponds to the information used by the Company's management in its activities.

The interim financial information has been prepared using the historical cost as the basis of value, the net realizable value, the fair value or the recovery value, except when otherwise indicated.

The preparation of these interim financial information requires Management to use certain accounting estimates, judgments and assumptions that affect the application of Accounting Polices and the amounts reported on the balance sheet date of assets, liabilities, income and expenses may differ from actual future results. The assumptions used are based on history and other factors considered relevant and are reviewed by the Company’s management.

The interim financial information has been prepared and is being presented in accordance with CPC 21 (R1) - “Interim Financial Reporting” and IAS 34 - “Interim Financial Reporting”, consistently with the standards issued by the CVM.

This interim financial information does not include all requirements of annual or full financial statements and, accordingly, should be read in conjunction with the Company’s financial statements for the year ended December 31, 2020.The accounting policies and critical estimates, when applicable and relevant, are included in the respective explanatory notes and are consistent with the previous period presented.

Therefore, in this interim financial information the following notes are not repeated, either due to redundancy or to the materiality in relation to those already presented in the annual financial statements:

Note 10 – Consolidation and investment basis

Note 12 – Intangible assets

Note 18 – Income tax and social contributions

Note 19 – Taxes in installments

Note 20 – Provisions for tax, social security, labor, civil, environmental risks and judicial deposits

Note 30 – Employee benefits

Note 31 - Commitments

The interim financial information was approved by the Board of Directors on November 03, 2021.

The accounting records included in the interim financial information of each of the Company’s subsidiaries are measured using the currency of the principal of the economic environment in which each subsidiary operates (“the functional currency”). The interim financial information is presented in R$ (reais), which is the Company’s functional and reporting currency.

Foreign currency transactions are translated into the functional currency using the exchange rates prevailing on the transaction or valuation dates, in which the items are remeasured. The balances of the asset and liability accounts are translated using the exchange rate on the balance sheet date. As of September 30, 2021, US$1.00 is equivalent to R$5.4394 (R$5.1967 on December 31, 2020) and €1.00 is equivalent to R$6.2983 (R$6.3779 on December 31, 2020), according to the rates obtained from Central Bank of Brazil website

Pursuant to Law 11,638/07, the presentation of the statement of value added is required for all publicly-held companies. These statements were prepared in accordance with CPC 09 - Statement of Value Added, approved by CVM Resolution 557/08. The IFRS does not require the presentation of this statement and for IFRS purposes is presented as additional information.

At the end of 2019, the COVID-19 virus spread worldwide, and in March 2020, the WHO (World Health Organization) declared a pandemic of this disease. Since the beginning of the pandemic, the Company has adopted several precautionary measures in all its areas to reduce the exposure of its employees and to guarantee the continuity of its business.

In this sense, in 2020 all employees in chronic conditions of vulnerability (risk group) were mapped and put on vacation and, since then, in a non-presential work regime (home office) together with most other employees in order to reduce their corporate staff by around 50%. In 2021, the most critical stage of the pandemic, the Brazilian authorities adopted more restrictive measures and the Company adopted home office to 80% of its employees who work in administrative roles in São Paulo. In addition, masks were provided in the beginning of the pandemic for all employees, hand sanitizer was made available in all company

facilities, and we also released internal communications with preventive measures in order to reinforce the hygiene protocols recommended by the competent authorities. As of the last week of September 2021, the home-office model was discontinued and all employees returned to presential work

The Company’s economic activity is directly linked to the demand for steel products in the automotive, domestic and civil construction sectors, as well as iron ore, both in the domestic and international markets. Any reduction in the activity of these sectors could affect the demand and the price of products and have significant impact to the Company’s financial position and results.

Our portfolio of investments and the nature of our industrial plants have long-term characteristics. The long-term operational and economic context to which the Company operates allows greater flexibility in the strategies and plans to mitigate the risks and effects of the pandemic on its business and, consequently, ensure the maintenance of the expected recoverability of its non-financial assets, whether investments, fixed assets and tax credits.

The Company did not experience any significant impact to its railway and maritime logistics. There was also no impact to the availability of supplies that could have interrupted its operational activities.

According to the guidelines of the Brazilian Securities and Exchange Commission (CVM), the Company assessed any effects that are related to business continuity and its accounting estimates. Despite some adverse effects perceived at the beginning of the pandemic, which over the rest of the year had already dissipated, such adverse effects did not bring risks of continuity or the need for adjustments to accounting estimates that produced significant effects on the Company’s business and consequently on its financial position.

The Company maintains all of its medium and long-term production and sales forecasts.

4.1 Acquisition of control of the companies Elizabeth Cimentos and Elizabeth Mineração.

On August 31, 2021 CSN Cimentos S.A. acquired control of the cement business segment belonging to the Farallon fund, by acquiring 99.975% of the shares of Elizabeth Mineração and 99.99% of the shares of Elizabeth Cimentos, 88.746% of which directly and 11.254% indirectly. The assets acquired are located in the northeast region of the country. Upon completion of the transaction, CSN Cimentos S.A. expects relevant operational, logistical, management and commercial synergies, with room for evolution in the product mix and expansion of the client base.

In according with CPC15 / IFRS3, the purchase price is determined by the sum of the assets transferred, liabilities incurred, equity interests issued, non-controlling interest and the fair value of any interest held prior to the transaction. The table below summarizes the price considered for accounting purposes:

(i) The transaction included payments by CSN Cimentos of R$77.7 million and R$123.9 million on August 31, 2021, and assets in the amount of R$4.5 million and R$5.1 million, to be received during the third quarter of 2021, related to the working capital adjustment provided for in the sale agreement.

(ii) Elizabeth Cimentos performed a primary issuance of 2,382,758,512 common shares, nominatives with no par value, which were fully acquired by CSN Cimentos.

In accordance with item 32 of CPC15 / IFRS3, the acquirer must recognize goodwill based on expected future profitability on the acquisition date, measured by the amount by which the purchase price exceeds the fair value of the assets and liabilities acquired (purchase price allocation). The transaction generated goodwill for expected future profitability of R$107.1 million, as shown in the table below.

The goodwill for expected future earnings is recorded under intangible assets and, since it does not have a defined useful life, it is not amortized, in accordance with CPC04/IAS38. As of 2022, CSN Cimentos will begin to perform the recoverability test for this asset in accordance with the requirements of CPC01/IAS36.

In the acquisition of Elizabeth Mineração, the price paid was fully allocated to the assets acquired, not generating goodwill for future profitability.

(i) Fair value of assets and liabilities acquired pre-merger

The following table shows the fair value allocation for 100% of the assets acquired and liabilities assumed on August 31, 2021, considering the direct and indirect interests, calculated based on independent appraisers' reports.

The fair value allocation resulted in a total gain of R$542.7 million, distributed among Elizabeth Cimentos and Elizabeth Mineração's main assets. The following table shows the composition of the allocated amounts and a summary of its measurement methodology.

The subsidiary CSN Cimentos S.A. has hired an independent company to prepare an appraisal report of the tangible and intangible assets and allocation of the excess price paid. As provided for in item 45 of CPC15 / IFRS3, the Company has up to 12 months to make adjustments in the measurement of amounts due to events not considered.

Our investments are basically in private and public securities with yields linked to the variation of Interbank Deposit Certificates (CDI) and repo operations backed by National Treasury Notes respectively. The Company invests part of the funds through exclusive investment funds which have been consolidated in these financial statements.

The financial resources available abroad are invested in private securities, in banks considered by the Administration as first-rate and are remunerated at pre-fixed rates.

The composition of the gross balance of accounts receivable from third party customers is shown as follows:

The changes in expected credit losses are as follows:

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The changes in estimated losses on inventories are as follows: