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

Corporate Taxpayer’s ID (CNPJ): 43.776.517/0001-80

Company Registry (NIRE): 35.300.016.831

PAYMENT OF INTEREST ON OWN CAPITAL

NOTICE TO SHAREHOLDERS

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp (“Companhia” or “Sabesp”) hereby informs its Shareholders that were approved at the Annual and Extraordinary Shareholders’ Meeting held today the payment of interest on own capital related to the period from January to December 2022, to the Shareholders registered as such on April 28, 2023.

I – AMOUNT, DATE AND CREDIT AND PAYMENT TERMS

The interest on own capital, totaling eight hundred and seventy-two million, one hundred and fifty-eight thousand, five hundred and ninety-two reais and eighty-four cents (R$ 872,158,592.84) corresponding to R$ 1.2760 per common share, will be paid on June 26, 2023.

II – WITHHOLDING INCOME TAX

Income tax shall be withheld from the amount of interest on own capital declared to shareholders, pursuant to the laws in force, except for the immune or exempt shareholders proving such condition until May 10, 2023, and corresponding documents shall be sent to the Company's headquarters located at Rua Costa Carvalho, 300 – Sala 265 – São Paulo – SP – CEP 05429-900, in attention to the Superintendência de Captação de Recursos e Relações com Investidores or to email address sabesp.ri@sabesp.com.br.

Referring to the entities of Supplementary Private Pension, Insurance Companies and Fapi, such proof shall occur by means of Declaration, a model of which is available on the Company's Investor Relations website, in the item Investor Services on the website https://ri.sabesp.com.br/.

III – ATTRIBUTION TO DIVIDENDS

The aforementioned interest on own capital will be computed in the calculation of the mandatory minimum dividends, as provided for in the caput of Article 49 of the Company’s Bylaws, pursuant to article 9, paragraph 7, of Law 9,249/95.

IV – INSTRUCTIONS FOR THE CREDIT AND PAYMENT OF INTEREST ON OWN CAPITAL

The shareholders will have their credits available on the date of payment of such right, as set forth in above item I, in accordance with their checking account and domicile provided to Bradesco S.A.

To shareholders whose registry information does neither include their Individual/Corporate Taxpayer’s Identification Number (CPF/CNPJ) nor completion of banking instructions (bank, branch and account number), the interest will be credited, pursuant to item I above, as of the third business day counted from the date of registry update in Bradesco S.A.’s electronic files. This update may be carried out at any of its branches.

V – RECORD DATE

The shares will trade ex-interest as of May 1, 2023 in the American market and May 2, 2023 in the Brazilian market.

Further information may be obtained at any of Bradesco S.A.’s branches during banking hours.

São Paulo, April 28, 2023.

Catia Cristina Teixeira Pereira

Chief Financial Officer and Investor Relations Officer