6-K
Companhia De Saneamento Basico Do Estado De Sao Paulo-Sabesp (SBS)
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
FORM 6-K
REPORT OF FOREIGN ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 OF THE
SECURITIES EXCHANGE ACT OF 1934
For May, 2024 (Commission File No. 1-31317)
Companhia de Saneamento Básico do Estado de São Paulo - SABESP
(Exact name of registrant as specified in its charter)
Basic Sanitation Company of the State of Sao Paulo - SABESP
(Translation of Registrant's name into English)
Rua Costa Carvalho, 300 São Paulo, S.P., 05429-900 Federative Republic of Brazil
(Address of Registrant's principal executive offices)
Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.
Form 20-F ___X___ Form 40-F ______
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1)__.
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7)__.
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___
If "Yes" is marked, indicated below the file number assigned to the registrant in connection with Rule 12g3-2(b):

COMPANHIA DE SANEAMENTO BÁSICODO ESTADO DE SÃO PAULO – SABESPCompanhia Aberta
CNPJ 43.776.517/0001-80
NIRE 35300016831
MATERIAL FACT
Companhia de Saneamento Básicodo Estado de São Paulo – Sabesp (“Company”), in compliance with Resolution 44 of the Brazilian Securities and Exchange Commission (CVM – Comissão de Valores Mobiliários), of August 23, 2021, and in continuity with the Material Facts disclosed on April 22, 2024 and May 20, 2024, hereby informs its shareholders and the market in general that, on May 24, 2024, the Concession Agreement No. 1/2024 was signed between the Company and the Deliberative Council of Regional Unit for Drinking Water Supply and Sewage Services – URAE-1 Southeast, and, as an intervening party, the São Paulo State Public Services Regulatory Agency – ARSESP, for the provision of water supply and sewage services to the municipalities that are part of URAE-1 ("Concession Agreement").
The effectiveness of the Concession Agreement is conditional on the conclusion of the Company's privatization process, under the terms of State Law No. 17,853, of December 8, 2023, and will be valid until October 19, 2060.
The full content of the signed Concession Agreement is available at link below:
| · | Concession Agreement URAE-1 |
|---|
São Paulo, May 27, 2024.
Catia Cristina Teixeira Pereira
Chief Financial Officer and Investor Relations Officer

SIGNATURE
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.
Date: May 27, 2024
| Companhia de Saneamento Básico do Estado de São Paulo - SABESP | |
|---|---|
| By: | /s/ Catia Cristina Teixeira Pereira <br><br> <br>* * * |
| Name: Catia Cristina Teixeira Pereira<br><br><br> <br>Title: Chief Financial Officer and Investor Relations Officer |
FORWARD-LOOKING STATEMENTS
This press release may contain forward-looking statements. These statements are statements that are not historical facts, and are based on management's current view and estimates of future economic circumstances, industry conditions, company performance and financial results. The words "anticipates", "believes", "estimates", "expects", "plans" and similar expressions, as they relate to the company, are intended to identify forward-looking statements. Statements regarding the declaration or payment of dividends, the implementation of principal operating and financing strategies and capital expenditure plans, the direction of future operations and the factors or trends affecting financial condition, liquidity or results of operations are examples of forward-looking statements. Such statements reflect the current views of management and are subject to a number of risks and uncertainties. There is no guarantee that the expected events, trends or results will actually occur. The statements are based on many assumptions and factors, including general economic and market conditions, industry conditions, and operating factors. Any changes in such assumptions or factors could cause actual results to differ materially from current expectations.