X0607 3 2025-04-30 0 0001049659 NATIONAL STEEL CO SID 0001220436 Steinbruch Benjamin true AVENIDA BRIGADEIRO FARIA LIMA, 3400 20 FLOOR SAO PAULO SAO PAULO D5 04538132 1 1 0 0 CEO and Board Member Common Shares 500002 D Common Shares 45706242 I By shareholder Common Shares 552412693 I By controlling shareholder These shares are owned directly by Rio Iaco Participacoes S.A., a direct shareholder of the issuer, in which the reporting person holds an indirect pecuniary interest. The reporting person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. These shares are owned directly by Vicunha Acos S.A., the direct controlling shareholder of the issuer, in which the reporting person holds an indirect pecuniary interest. The reporting person disclaims beneficial ownership of such shares except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose. /s/ Mayra Favero Celleguin, Attorney-in-Fact for Benjamin Steinbruch 2026-04-07