Companhia Siderúrgica Nacional S A : 2Q23 ESG Performance

ENVIRONMENTAL, SOCIAL AND GOVERNANCE

Leadership in ESG issues

2Q23 ESG PERFORMANCE

We are happy to present the 2Q23 ESG Report of CSN's Group independently from financial reports, entirely dedicated to monitoring relevant indicators for our investors and other stakeholders.

At CSN, ESG commitments have been present in the essence of the Company for several years; with "Doing it Well, Doint it More, Doing it Forever," we are committed to acting responsibly and efficiently, taking care of our people, and always aiming to build a sustainable future.

We are a Company in constant growth, with multisectoral and integrated operations among our businesses, which bases its growth strategy on four fundamental pillars: austerity in costs, ESG, innovation, and financial discipline.

2022 was a historic year for the CSN Group, with significant advances in the ESG agenda, which are detailed in our 2022 Integrated Report, published in April of this year. The annual report, assured by a third party, was designed in line with GRI, IIRC, TCFD, and SASB standards and detailed our results and efforts in 2022.

Another highlight was the beginning of the implementation of the Biodiversity Index for Operations

• BIO, an indicator that will allow us to rank the level of biodiversity preservation in our operations, enabling comparison between them and the definition of specific goals.

Another expressive result to be celebrated was the reduction of 14% in our accidents frequency rate when compared to the first semester of 2022, reinforcing the company's efforts with the target set in our ESG Journey.

In 2Q23, CSN also celebrates its evolution in ESG ratings. We evolved from D+ to C- on ISS and 2.5 to 3.4 on FTSE Russell's ESG, a new accomplishment that was only possible thanks to the engagement, actions, and practices of positive impact, the CSN and CSN Mineração team's commitment to the ESG agenda, and the conciseness that we still have a lot to contribute.

These and other highlights, in addition to our performance in ESG indicators in the last quarter, can be found on the next pages of our 2Q23 ESG performance report.

We wish you a great reading!

ENVIRONMENTAL, SOCIAL AND GOVERNANCE

2Q23 ESG PERFORMANCE

Atmospheric Emissions

• Reduce 40% of particulate matter emissions per ton of crude steel produced at the UPV (steelworks) by 2030, base year 2019.

Water Use Efficiency and Effluent Management

• Reduce new water consumption for iron ore production by at least 10% per ton of ore produced by 2030, compared to the base year 2018.¹

Management and De-characterization of Dams

• Carry out the complete de-characterization of dams built upstream of CSN by 2030.

¹The water intensity is calculated based on the production of iron ore (wet + dry) and the capture of water

intended onlyfor the production process of the ore, considering the water used in the Central Plant, in the Pires

Complex and drinking water.

Social Capital

• Continually achieve the zero-fatality rate across the CSN Group (own employees and third parties).
• Reduce the accident frequency rate by 30% (with and without lost time injuries, own employees and third parties) by 2030 in the CSN Group compared to 2020 (1 million hours worked factor).
• Reduce by 30% the number of days off work due to accidents with own employees compared to 2021.

Diversity and Inclusion

• Achieve 28% female representation in the CSN Group by 2025 (base year 2020).

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"OUR AMBITION IS TO PROVIDE ESSENTIAL CARBON NEUTRAL MATERIALS TO THE SOCIETY BY 2050."

ENVIRONMENTAL, SOCIAL AND GOVERNANCE

2Q23 ESG PERFORMANCE

Since the first quarter of 2023, CSN has started a new format for disclosing its ESG actions and performance, providing its performance in ESG indicators individually. The new model allows stakeholders to access the main results and indicators every quarter and monitor them faster and more effectively.

This ESG Report already incorporates the performance indicators of the new assets of CSN Cimentos, acquired in 2022; in this sense, some absolute indicators will change significantly compared to the previous period, when these operations had not yet been incorporated.

The information included in this release was selected considering its relevance and materiality to the company. Quantitative indicators are presented in comparison with the period that best represents the metric for its monitoring. Thus, some are compared with the same quarter of the previous year and others with the average of the previous year, ensuring a comparison based on seasonality and periodicity.

More detailed historical data on CSN's performance and initiatives, in addition to performance on other ESG targets, can be seen in the 2022 Integrated Report, released in April 2023 (esg.csn.com.br/nossa-empresa/relatorio-integrado-gri).The ESG KPIs' assurance occurs annually for the Integrated Report disclosure; therefore, the information in the quarterly releases is subject to adjustments from this process.

It is also possible to monitor CSN's ESG performance on our website: esg.csn.com.br

External recognition in indices and ratings demonstrates that the Company is constantly evolving, committed to transparency and reporting of the main ESG actions and indicators, and in line with sustainable development.

The 2Q23 consolidates the Company's evolution in three important ESG ratings. At the Sustainalytics agency, it reduced the score related to ESG risks from 26.0 to 25.9. CSN Mineração reached 23.1 by this same agency, being both companies among the six lower-risk companies in the Steel and Mining sectors. In total, 156 companies were assessed globally.

In the ISS ESG rating, the Company went from D+ to C-. In the "GHG emission reduction targets and action plans" item, the Company progressed from D to B-, considering a D- to A+ scale.

CSN was again listed in the FTSE4Good¹, improving its rating from 2.5 in 2022 to 3.4 in 2023. On FTSE, CSN has on the environment pilar a 43% higher grade when compared to the steel and iron ore sector. In the specific item related to "climate change," CSN performs 30% higher than the other Brazilian companies.

Index Series meet a v ariety of environmental, social and gov ernance criteria."

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