Form 4 Filing for Roberval Tavares de Sousa

This filing reports a transaction by Roberval Tavares de Sousa, identified as an Engineering Officer of COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP (SBS). On May 25, 2026, Mr. de Sousa disposed of 5,900 common shares at a price of $28.81 per share. Following this transaction, he holds 76 common shares directly. The filing was signed on May 29, 2026, by his attorney-in-fact.