Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Table of Contents

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Company Information / Capital Breakdown

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Consolidated Interim Income Statement

(R$ thousand)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

NOTES TO THE FINANCIAL STATEMENTS
(In thousands of reais, unless otherwise indicated)

Companhia Siderúrgica Nacional (“CSN”, also referred to as “Company” or “Parent 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”), reporting its information to the Brazilian Securities and Exchange Commission (“CVM”) and to the U.S. Securities and Exchange Commission (“SEC”).

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 its facilities in Brazil, CSN has commercial operations in the United States and operations in Portugal and Germany in order to expand its market presence and provide excellent services to end consumers. Its steel is used in home appliances, civil construction, packaging and automobile industry.

Iron ore production is carried outin the cities of Congonhas, Belo Vale and Ouro Preto, in the State of Minas Gerais, by its subsidiary CSN Mineração S.A. (“CSN Mineração”). The Company’s mining activities also include tin exploration in the state of Rondônia conducted by CSN's subsidiary Estanho de Rondônia S.A. (“ERSA”), to meet the needs of the UPV. The surplus of this raw material is sold to subsidiaries and third parties.

Iron ore is primarily sold in the international market, particularly in Europe and Asia. The prices charged in these markets are historically cyclical and subject to significant fluctuations over short periods of time, influenced by factors such as global demand, strategies adopted by the major steel producers, and the foreign exchange rates. All these factors are beyond the Company’s control. The ore is transported by rail to the Terminal de Carvão e Minérios at the Port of Itaguaí (“TECAR”), a solid bulk terminal, one of the four terminals that comprise the Itaguai Port, located in the State of Rio de Janeiro and from TECAR to customers around the world. The imports of coal and coke are also carried out through this terminal by provision of services by CSN Mineração to CSN.

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, since January 2020, has a complete structure for tailings filtration, allowing the dry stacking of the material. The tailings are disposed of in geotechnically controlled piles in areas exclusively designated for stacking, avoiding the use of dams for this purpose.

As a consequence of these measures, decommissioning dams is the natural progression for processing filtered tailings. All of our mining dams are certified and comply with current environmental regulations.

CSN entered the cement market to leverage the synergy between this activity and its existing businesses. The cement production unit located adjacent to the UPV facilities, in Volta Redonda, RJ, produces CP-III type cement using slag produced by UPV's own blast furnaces. There is also the exploration of limestone and dolomite at the Arcos, MG unit to meet the needs of the steel industry and the cement factory, as well as the production of clinker at the same unit.

On August 31, 2021, the subsidiary CSN Cimentos S.A. (“CSN Cimentos”) completed the acquisition of control of Elizabeth Cimentos S.A. and Elizabeth Mineração Ltda., operating in the Northeast region, especially in Paraíba and Pernambuco. On May 1, 2022, Elizabeth Mineração was merged into CSN Cimentos.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

On September 9, 2021, CSN Cimentos entered into the Agreement for the Sale and Purchase of the Shares in LafargeHolcim (Brasil) S.A., for the acquisition of 100% of the shares issued by LafargeHolcim (Brasil) S.A. (“LafargeHolcim”). On September 6, 2022, the acquisition of all shares issued by LafargeHolcim S.A. was completed, with the corporate name of LafargeHolcim being changed to "CSN Cimentos Brasil S.A.", which became controlled by CSN Cimentos. The Company's main activities are production, industrial operations and trade of cement, lime, mortar, minerals, and metals in general and complementary products for civil construction, in natura with industrial plants, warehouses and branches across the country.

On August 31, 2023, the Extraordinary General Meeting approved the merger of CSN Cimentos into CSN Cimentos Brasil with the consequent transfer of all assets, assets (movable and immovable), rights and obligations, in accordance with the terms of the “Protocol and Justification of the Incorporation of CSN Cimentos S.A. by CSN Cimentos Brasil S.A.”. Thus, CSN Cimentos was extinguished, all its shares were canceled and, in replacement, its shareholders received shares in CSN Cimentos Brasil. All activities carried out by CSN Cimentos are now carried out by CSN Cimentos Brasil. The Valuation Report of CSN Cimentos' equity as of June 30, 2023, being the basis for defining a capital increase in CSN Cimentos Brasil in the amount of R$2,383,276.

Railroads:

CSN has interests in three railroad companies: MRS Logística S.A. (“MRS”), 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 holds 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 - spans the States of Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, and Alagoas. Key routes includes São Luís to Altos, Altos to Fortaleza, Fortaleza to Sousa, Sousa to Recife/Jorge Lins, Recife/Jorge Lins to Salgueiro, Jorge Lins to Propriá, Paula Cavalcante to Cabedelo, Itabaiana to Macau (Mesh I) and TLSA is responsible for the stretches from Eliseu Martins-Trindade, Trindade-Salgueiro, Salgueiro-Missão Velha and Missão Velha-Pecém (Mesh II), which are currently under construction.

Ports:

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

TECON handles the movement and storage of containers, vehicles, steel products, general cargo, and other items, and TECAR manages the loading and unloading of solid bulk ships, as well as the storage and distribution (road and rail) of coal, coke, petroleum coke, clinker, zinc concentrate, sulfur, iron ore and other bulk, intended for the seaborne market, supports both the Company’s operations and those of various customers.

Since energy supply is fundamental to CSN’s production process, the Company has electricity generation assets to mitigate costs, enhance competitiveness.

On June 30, 2022, the Company's subsidiaries, CSN Cimentos and CSN Energia S.A. ("CSN Energia"), completed the acquisition of Santa Ana Energética S.A. (“Santa Ana”), as well as Topázio Energética S.A. ("Topázio") and, indirectly, Brasil Central Energia Ltda. ("BCE"), a subsidiary of Topázio, under the terms of the Share Purchase Agreement entered into on April 8, 2022 with Brookfield Americas Infrastructure (Brazil Power) Fundo de Investimento em Participações Multiestratégia, private equity fund managed by Brookfield Brasil Asset Management Investimentos Ltda. On October 7, 2022, subsidiaries CSN Mineração and CSN Energia S.A. completed the acquisition of 100% of the shares of Companhia Energética Chapecó – CEC, holder of the concession for the Quebra-Queixo Hydroelectric Power Plant (“Chapecó”), in accordance with the Agreement for the Purchase and Sale of Shares and Other Covenants and in the Private Instrument of Assignment of Rights and Obligations wich were signed on July 1, 2022 and July 25, 2022, respectively.

In July 2022, the Company won the auction held by the State of Rio Grande do Sul, for the sale of 100% of the shares it held, 6,381,908 equivalent to 66.23% of the share capital, of Companhia Estadual de Energia Elétrica - CEEE-G, as part of the CEEE Group privatization program, in accordance with State Law 15.298/19.On October 21, 2022, the transaction was completed with payment by the company of the auction winning price. On December 22, 2022, the acquisition of Eletrobras' 32.74% interest in CEEE-G was completed. On November 22, 2023, the post-takeover bid auction was settled, in which CFB acquired 1,271 (one thousand two hundred and seventy-one) common shares and 338 (three hundred and thirty-eight) preferred shares issued by CEEE-G, was concluded the Company currently holds 99% of the share capital of CEEE-G.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Management understands that the Company has adequate resources to continue its operations. Accordingly, the Company's interim financial information for the period ended June 30, 2024, have been prepared on a going concern basis.

The parent company and consolidated interim financial information (“interim financial information”) have been prepared and are presented in accordance with the accounting practices adopted in Brazil, issued by the Brazilian Accounting Pronouncements Committee (“CPC”), approved by the Brazilian Securities and Exchange Commission (“CVM”) and by the Brazilian Federal Accounting Council (“CFC”), and in accordance with the International Financial Reporting Standards (“IFRS”) issued by the International Accounting Standard Board (“IASB”) and disclose all the relevant information of the interim financial information, and only this information, and includes only the data used by the Company's management in its activities. The consolidated interim financial information are identified as “Consolidated” and the parent company's individual interim financial information are identified as “Parent Company”.

The interim financial statements were prepared based on the historical cost and were adjusted to reflect: (i) the fair value measurement of certain financial assets and liabilities (including derivative instruments), as well as pension plan assets; and (ii) impairment losses. When IFRS and CPCs allows the option between cost or another measurement criterion, the cost of acquisition criterion was used.

The preparation of these interim financial statements requires Management to use certain accounting estimates, judgments, and assumptions that affect the application of Accounting polices 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, 2023.

The new standards adopted for financial years beginning on or after January 1, 2024 are described in Note 2.e.

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 2d - Accounting policies

Note 9b - Additional information on operating subsidiaries headquartered in Brazil and abroad

Note 11a – Goodwill impairment test

Note 17b – Sensitivity analysis of deferred income tax and social contribution

Note 18 - Installment taxes

Note 21a - Transactions with controlling shareholders

Note 21c - Other unconsolidated related parties

Note 29 - Employee benefits

Note 30 - Commitments

Note 31 - Insurance

The consolidated financial statements were approved by Board of Directors on August 09, 2024.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

The accounting records included in the interim financial statements of each of the Company’s subsidiaries are measured using the currency of the principal economic environment in which each subsidiary operates (“the functional currency”). The consolidated and parent company interim financial statements are presented in Brazilian reais (BRL), 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 converted using the exchange rate on the balance sheet date. As of June 30, 2024, US$1 was equivalent to BRL 5.5589 (compared to BRL 4.8413 on December 31, 2023) and €1 was equivalent to BRL 5.9547 (compared to BRL 5.3516 on December 31, 2023), according to the rates obtained from the Central Bank of Brazil website.

Pursuant to Law 11,638/07, the presentation of the statement of added value is required for all publicly held companies. These statements were prepared in accordance with CPC 09 – Statement of Added Value. IFRS does not require the presentation of this statement; therefore, it is presented as additional information for IFRS purposes.

The new requirements, standards, amendments and interpretations that came into force for fiscal years starting on January 1, 2024, are:

• Amendment to IFRS 16 – Lease Liability in a Sale and Leaseback;

• Amendments to IAS 1 – Classification of Liabilities as "Current" or "Non-Current";

• Amendments to IAS 7 and IFRS 7 – Disclosures on forfaiting operations.

In relation to these changes, the Company did not identify significant impacts that would alter its disclosures in terms of the adoption and interpretation of the rules; except for the amendments to IAS 7 and IFRS 7. These amendments result from the addition of items 44F and 44H to Technical Pronouncement CPC 03 (R2) – Cash Flow Statements, which provide greater detail on forfaiting operations as disclosed in note 15.a. Suppliers - Forfaiting).

Our investments are primarily in private and public securities with yields tied to the variation of Interbank Deposit Certificates (CDI) and repo operations backed by National Treasury Notes, respectively. The Company invests portion of the funds through exclusive investment funds that have been consolidated in this interim financial information.

The financial resources available abroad, held in dollars and euros, are invested in private securities, in banks considered by the Administration to be first-rate and are remunerated at fixed rates.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

(1) These are financial investments with restricted modalities and linked to a Bank Deposit Certificate (CDB) to secure a letter of guarantee with financial institutions, and to investments in Government bonds (LFT - Treasury Financial Letters) managed by the Company’s exclusive funds. The subsidiary CSN Cimentos Brasil holds financial investments with availability restrictions as collateral for a liability, whose redemption term is indefinite, with a balance of R$3,946 on June 30, 2024, and R$122,687 on December 31, 2023

(2) As of June 8, 2024, contracts involving portions of Usiminas shares held by the Company as collateral (fiduciary alienation) have been settled.

(3) Bonds with Banco Fibra, maturing in February 2028 (see note 20.a).

5.      TRADE RECEIVABLES

The composition of the gross balance of accounts receivable from third-party consumers is as follows:

The changes in the estimated credit losses are as follows:

The Company conducts credit assignment transactions without co-obligation. After assignment the customer's trade notes/securities and receipt of the funds from the closing of each transaction, CSN settles the related accounts receivable and is fully released from the credit risk associated with these transactions. The financial charges related to credit assignment transactions in the period ended June 30, 2024 were R$13,463 in the consolidated and R$12,955 in the parent company, classified under financial expenses.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

The changes in the provision for losses on inventories are as follows:

The credits arise mainly from ICMS (Brazilian State Value-Added Tax), PIS (Social Integration Program Contribution) and COFINS (Contribution for the Financing of Social Security) - both of which are Brazilian federal taxes on business revenues levied on purchases of inputs and fixed assets, in accordance with current legislation. These credits are typically realized through offsets against liabilities of the same nature or with other federal taxes, as permitted by legislation. Based on analyses and projections made by Management, the Company does not foresee any risk of non-realization of these tax credits.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

Other current and non-current assets are as follows:

The information regarding the activities of jointly controlled subsidiaries, joint operations, associates and other investments remains unchanged from what was disclosed in the Company's financial statements as of December 31, 2023. Therefore, Management has decided not to repeat this information in the interim financial statements of June 30, 2024.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

(*) Dormant companies.

(1) On January 15, 2024, Panatlântica started to be valued using the equity method on account of the acquisition of 18.61% of the shares at a total price of R$ 150,000 with the Company holding 29.92% of Panatlântica's capital. Prior to such acquisition, the Company valued the investment at fair value through the result.

(2) On February 21, 2024, the Company became the holder of 100% of the shares of the subsidiary CEEE-g (as of December 31, 2023, 98,98%), and for this reason, there was a small percentage increase in the indirect participation of the companies Companhia Energética Rio das Antas – CERAN, Ventos do Sul Energia S.A., Chapecoense Geração S.A. and Foz Chapecó Energia S.A.

(3) On March 7,2024, the company CSN International Steel GmbH was established by the Company's direct subsidiary, CSN Steel S.L.U.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

The positions presented as of June 30, 2024 and the changes refer to the interest held by CSN in these companies:

(1) The balance movement refers to the change in the valuation method of the Panatlântica investee due to the acquisitions of the aforementioned shares. As mentioned, the company, which was valued at fair value through results, started to be valued through the equity method.

(2) These are strategic investments in startups made by the subsidiary CSN Inova Ventures, which are valued using the cost method, in the following companies: Alinea Health Holdings Ltda. I.Systems Aut. Ind., 2D Materials, H2Pro Ltda, 1S1 Energy, Traive INC., OICO Holdingsand Global Dot.

The reconciliation of equity in earnings of companies with shared control classified as joint ventures and associates and the amount presented in the income statement is presented below and results from the elimination of the results of CSN's transactions with these companies:

(1) The operating margin of intercompany transactions with group companies classified as joint ventures, which are not consolidated, are reclassified in the Statement of Income from the Investment group to the costs and income tax and social contribution groups.

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)

The changes in the Parent Company's investment are presented below:

The balance sheet and income statement balances of the companies with shared control are shown below and refer to 100% of the companies’ results:

Quarterly Financial Information – June 30, 2024 – Companhia Siderúrgica Nacional (CONVENIENCE TRANSLATION INTO ENGLISH FROM THE ORIGINAL PREVIOUSLY ISSUED IN PORTUGUESE)