Companhia Siderúrgica Nacional : Minutes of the Board of Directors' Meeting Held on September 09, 2021

MINUTES OF THE EXTRAORDINARY MEETING OF THE BOARD OF DIRECTORS OF THE COMPANHIA SIDERÚRGICA NACIONAL, HELD ON SEPTEMBER 9, 2021.

Corporate Taxpayer's ID (CNPJ/MF): 33.042.730/0001-04

NIRE: 35300396090

1. Date: September 9, 2021.
2. Time: 17h30
3. Place: Av. Brig. Faria Lima, 3400, 20º andar, São Paulo - SP
4. Call Notice: Dismissed in view of the presence of all members of the Board of Directors, as provided for in Article 15, paragraph 5 of CSN's Bylaws ("Bylaws").
5. Attendance: Benjamin Steinbruch (Chairman), Yoshiaki Nakano, Antonio Bernardo Vieira Maia, Miguel Ethel Sobrinho and Fabiam Franklin - Directors; Claudia Maria Sarti - General Secretary of the Board of Directors, with the meeting being held as provided for in Article 15, § 2, of the Bylaws.

Resolutions After examination and discussion, the members of CSN's Board of Directors decided, by unanimous vote and without any reservations or exceptions, to approve (i) the acquisition, through its subsidiary CSN Cimentos SA ("CSN Cimentos"), of 100 % (one hundred percent) of the shares issued by LafargeHolcim (Brasil) SA, a corporation headquartered at Rua Saravata 784, Marechal Hermes, 21.557-010, in the City of Rio de Janeiro, State of Rio de Janeiro ("Lafarge Brazil"), a producer of cement, concrete and aggregates with an installed production capacity of 10.3 million tons of cement per year, for the base value of US$1.025 billion, which can be adjusted in accordance with the terms and conditions provided for in the share purchase and sale agreement to be entered into between Holcim Investments (Spain) and SLU and Holderfin BV, as sellers ("Sellers"), CSN Cimentos, as buyer, and CSN, as guarantor of CSN Cimentos ("Purchase and Sale Agreement") ("Transaction"), being the closing of this Transaction subject to approval by the competition authority; (ii) the execution of the Purchase and Sale Agreement by CSN, as guarantor of all the obligations assumed by CSN Cimentos under said Purchase and Sale Agreement; and (iii) the execution, by CSN, of all other documents related to the Transaction, as well as all other related accessory instruments; (iv) the immediate increase in the capital stock of CSN Cimentos in the amount of US$50 million, through the issue of new shares to be subscribed and paid in by CSN, in the context of the Transaction; (v) from now on any future increase in the capital of CSN Cimentos, through the issuance of new shares to be subscribed and paid in by CSN, which may be necessary in due course before the consummation of the Transaction, in order for CSN Cimentos to carry out the payment under the terms of the Purchase and Sale Agreement, such capital increase being limited to the acquisition price within the scope of the Transaction, the Executive Directors of CSN being hereby authorized to take all necessary measures to implement this resolution at the appropriate time, including define the exact amount to be contributed; and (v) the orientation of the vote of the representatives of CSN on the board of directors of CSN Cimentos at the meeting to be held on this date, September 9, 2021, in the sense of:

1. to approve the (a) execution, by CSN Cimentos, of the Purchase and Sale Agreement, through which CSN Cimentos will acquire 100% (one hundred percent) of the shares issued by Lafarge Brasil from the Sellers, all according to the draft whose copy duly

initialed by the General Secretary of the Board is filed at CSN's headquarters, as well as the presentation prepared by the CSN Board, whose copy duly initialed by the General Secretary of the Board is filed at CSN's headquarters; and (b) the execution, by CSN Cimentos, of all other documents related to the Transaction, as well as all other related accessory instruments;

1. 1. also in the context of the Transaction, to approve and take the necessary measures to effect the increase in CSN Cimentos' capital stock in the amount of US$50 million, through the issuance of new shares to be subscribed and paid in by CSN; and
   2. authorize CSN Cimentos' officers to perform all acts deemed necessary to carry out the above resolutions and to consummate the Transaction, including the signature of any and all documents, before public agencies and third parties in general.
2. Closing remarks: There being no further business to discuss, the meeting was adjourned, the minutes of which, after being read and found to be in order, were signed by all those present.
3. Signature: Bureau - Chairman: Benjamin Steinbruch; General Secretary of the Board of Directors: Claudia Maria Sarti; Board Members: Miguel Ethel Sobrinho, Fabiam Franklin, Yoshiaki Nakano and Antonio Bernardo Vieira Maia.

São Paulo, September 9, 2021.

C E R T I D IO N

Checks with the original drawn up in the proper book

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Claudia Maria Sarti

General Secretary of the Board of Directors