NOTICE ON RELATED-PARTY TRANSACTIONS

Braskem S.A. has informed shareholders and the market about a transaction between related parties. Braskem, Petróleo Brasileiro S.A. – Petrobras, and Ultrapar Participações S.A. are jointly acting as debenture holders for Refinaria de Petróleo Riograndense S.A. (RPR), which they co-own. The transaction involves the 4th Issue of Unsecured, Convertible Debentures, in Two Series, for private placement by RPR, amounting to BRL 451,300,173.78. The debentures will be convertible into shares by December 31, 2026. The debenture holders are obligated to subscribe and pay for the shares by March 25, 2026. The debentures will bear interest at a rate of CDI + 5.5% per annum until conversion. The transaction date was March 19, 2026. The issuance was approved by Braskem’s Board of Directors, and the terms are considered to reflect fair market conditions.