Form 6-K COMPANHIA DE SANEAMENTO For: Dec 31
PURSUANT TO RULE 13a-16 OR 15d-16 OF THE
São Paulo, S.P., 05429-900
Federative Republic of Brazil
annual reports under cover Form 20-F or Form 40-F.
Form 20-F ___X___ Form 40-F ______
in paper as permitted by Regulation S-T Rule 101(b)(1)__.
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___
registrant in connection with Rule 12g3-2(b):
COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP Publicly-held company CNPJ nº 43.776.517/0001-80 NIRE nº 35.3000.1683-1 FATO RELEVANTE Companhia de Saneamento Básico do Estado de São Paulo – Sabesp (“Company” or “Sabesp”), in compliance with the provisions of the Brazilian Securities Commission (“CVM”) Resolution No. 44, dated August 23, 2021, as amended, informs its shareholders and the market in general that ARSESP Resolution No. 1,748/2025 (“Resolution”) has been published in the State Official Gazette. According to the Resolution, the Company is authorized to apply an average adjustment of 6.5% to the current rates charged to users, effective as of January 1, 2026. Based on a preliminary review by the Company, this amount represents an increase of 10.6% in the equilibrium rate. Sabesp will work throughout the day to provide further clarification on the main items of the rate adjustment and will keep the market informed of any developments. Along with the Resolution, a Technical Note and an Excel Model were also published, which can be accessed directly on ARSESP’s website. The Company will keep its shareholders and the market informed of any developments in this matter. São Paulo, December 2, 2025. DANIEL SZLAK CFO and IRO

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Companhia de Saneamento Básico do Estado de São Paulo - SABESP | ||
| By: | /s/ Daniel Szlak
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Name: Daniel Szlak
Title: Chief Financial Officer and Investor Relations Officer |
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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.
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