X0609 4 2026-04-09 0 0001073404 GERDAU S.A. GGB GGBR 0002120458 Wahrhaftig Marcos Eduardo Faraco true AVENUE DOUTORA RUTH DE CARDOSO, 8501 8TH FLOOR, PINHEIROS SAO PAULO SAO PAULO D5 05425-070 0 0 0 1 Executive Vice President 0 Preferred shares 2026-04-09 4 S 0 12419 4.06 D 0 D Restricted Stock Units 3.84 2027-02-12 2027-02-12 Preferred shares 6395 6395 D Restricted Stock Units 3.75 2027-08-01 2027-08-01 Preferred shares 71832 71832 D Restricted Stock Units 3.73 2027-09-01 2027-09-01 Preferred shares 229331 229331 D Restricted Stock Units 3.6 2028-02-12 2028-02-12 Preferred shares 7789 7789 D Restricted Stock Units 4.1 2029-02-12 2029-02-12 Preferred shares 6850 6850 D The price is denominated in Brazilian reais and has been translated into U.S. dollars at the April 9, 2026 selling rate of R$5.0821 per US$1.00, as reported by the Central Bank of Brazil. The price reported in Column 4 is a weighted average price. There shares were sold in multiple transactions at prices ranging from $4.05 to $4.06, inclusive. /s/ Marcos Eduardo Faraco Wahrhaftig 2026-04-13