X0609 4 2026-08-06 0 0001073404 GERDAU S.A. GGB GGBR 0002120466 Japur Rafael Dorneles true AVENUE DOUTORA RUTH DE CARDOSO, 8501 8TH FLOOR, PINHEIROS SAO PAULO SAO PAULO D5 05425-070 0 0 0 1 VP, CFO and IR Officer 0 Preferred shares 2026-08-06 4 S 0 10000 5.1 D 86967 D Restricted Stock Units 3.89 2027-02-12 2027-02-12 Preferred shares 8923 8923 D Restricted Stock Units 3.89 2027-02-22 2027-02-22 Preferred shares 46634 46634 D Restricted Stock Units 3.8 2027-08-01 2027-08-01 Preferred shares 38047 38047 D Restricted Stock Units 3.65 2028-02-12 2028-02-12 Preferred shares 15830 15830 D Restricted Stock Units 4.15 2029-02-12 2029-02-12 Preferred shares 29933 29933 D Restricted Stock Units 4.15 2029-02-25 2029-02-25 Preferred shares 81108 81108 D The price is denominated in Brazilian reais and has been translated into U.S. dollars at the August 6, 2026 selling rate of R$5.1017 per US$1.00, as reported by the Central Bank of Brazil. The price is denominated in Brazilian reais and has been translated into U.S. dollars at the May 22 2026 selling rate of R$5.0140per US$1.00, as reported by the Central Bank of Brazil. /s/ Rafael Dorneles Japur 2026-08-10