Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the
information to the Commission pursuant to Rule 12g3-2(b) under
the Securities Exchange Act of 1934.

Yes ______ No ___X___

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP

PUBLICLY HELD COMPANY

CNPJ 43.776.517/0001-80

NIRE nº 35.3000.1683-1

NOTICE TO SHAREHOLDERS

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp (“Company” or “Sabesp”) informs its shareholders and the market in general that the dividends approved at the Annual and Extraordinary General Meeting of the Company held on April 29, 2025 (“AGM/EGM”), in the total amount of R$ 2,549,814,684.49 (two billion, five hundred and forty-nine million, eight hundred and fourteen thousand, six hundred and eighty-four reais and forty-nine cents) to be paid as dividends in the amount of R$ 718,691,745.44 (seven hundred and eighteen million, six hundred and ninety-one thousand, seven hundred and forty-five reais and forty-four cents) and Interest on Equity in the gross amount of R$ 1,831,122,939.05 (one billion, eight hundred and thirty-one million, one hundred and twenty-two thousand, nine hundred and thirty-nine reais and five cents), will be paid by the Company in a single installment, on May 20, 2025, in the proportion to the interest of each shareholder.

The remaining information mentioned in the Notice to Shareholders published on April 29, 2025 remains valid.

São Paulo, May 14, 2025

DANIEL SZLAK

Chief Financial and Investors Relations Officer Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the city São Paulo, Brazil.