Gerdau S.A. Announces Conclusion of Share Buyback Program

Gerdau S.A. has announced the conclusion of its 2025 Share Buyback Program, as originally disclosed on January 20, 2025. The program, which concluded on December 19, 2025, involved the acquisition of 1,500,000 common shares (GGBR3) at an average price of R$15.65 per share and 63,000,000 preferred shares (GGBR4 and/or ADRs backed by preferred shares (GGB)) at an average price of R$16.27 per share. This represents 100% of the planned buyback. The announcement was made via a Material Fact and reported on a Form 6-K filing with the U.S. Securities and Exchange Commission.