COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP

We were incorporated as a public, mixed capital company of unlimited duration on September 6, 1973, under the laws of the Federative Republic of Brazil. In 1994, we were registered with the CVM as a publicly held company and are therefore subject to CVM’s rules, including those relating to the periodic disclosure of extraordinary facts or relevant events. Our common shares have been listed on the B3 under the ticker SBSP3 since June 4, 1997. In 2002, we joined the Novo Mercado segment of the B3 and registered our common shares with the Securities and Exchange Commission ( SEC ) and started trading our shares in the form of ADR - level III on the New York Stock Exchange ( NYSE ) under the ticker SBS. Until June 2024, the State of S o Paulo owned a majority of our voting common shares. In July 2024, we were privatized, and the State of S o Paulo ceased to be our controlling shareholder. As part of our Privatization, Equatorial S.A. became a reference shareholder holding 15% of our voting capital. In accordance with our amended bylaws, we no longer have a controlling shareholder: our bylaws prohibit any shareholder or group of shareholders from exercising votes over 30% of our issued and outstanding voting capital or from entering into shareholders’ agreements for the exercise of voting rights in excess of 30% of our issued and outstanding voting capital. We are subject to Brazilian Corporate Law and to any and all laws and regulations that govern Brazilian private legal entities.