Form 4 Filing for Gerdau S.A.

Rafael Gamboa Lopes, Executive Vice President of Gerdau S.A., reported a disposition of 51,800 preferred shares on September 17, 2026. The transaction occurred at a price of R$5.09 per share, which was translated from Brazilian reais to US dollars at a rate of R$5.1521 per US$1.00. Following this transaction, Lopes directly owns 83,399 preferred shares. The filing also details several indirect holdings of restricted stock units (RSUs) that are convertible into preferred shares, with exercise dates ranging from February 12, 2027, to February 12, 2029, and exercise prices varying between R$3.56 and R$4.04. These RSUs represent a total of 83,000 underlying preferred shares.