Board unanimously approves resolutions at Sabesp (NYSE: SBS)

Rhea-AI Filing Summary

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp filed a Form 6-K reporting a material fact to investors. The company states that its Board of Directors, at a meeting held on December 18, 2025, unanimously approved resolutions without any restrictions or reservations.

Sabesp explains that additional information about these board resolutions is available in the minutes of the December 18, 2025 meeting and in related shareholder and market notices, which can be accessed at its headquarters, on its investor relations website, and on the B3 and Brazilian Securities Commission websites.

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FAQ

What did Sabesp (SBS) communicate in this Form 6-K filing?

Sabesp reported a material fact stating that its Board of Directors unanimously approved resolutions at a December 18, 2025 meeting. The company directed shareholders and the market to the board minutes and official notices for full details on these approved matters.

When did Sabesp’s board meet to approve the resolutions mentioned?

The board of Sabesp met on December 18, 2025 to approve the resolutions referenced in the material fact. The minutes of this meeting are available at the company’s headquarters, on its investor relations website, and on the B3 and Brazilian Securities Commission websites.

Where can investors find more details on Sabesp’s approved board resolutions?

Investors can find more details in the minutes of the December 18, 2025 Board of Directors meeting and in related notices to shareholders and to the market, available on Sabesp’s investor relations website, at its headquarters, and on the B3 and Brazilian Securities Commission websites.

Who signed Sabesp’s December 2025 material fact and Form 6-K?

The material fact and Form 6-K were signed by Daniel Szlak, Sabesp’s Chief Financial Officer and Investor Relations Officer. His signature appears on behalf of the company, fulfilling the requirements of the U.S. Securities Exchange Act for this type of foreign issuer report.

Does Sabesp’s communication include forward-looking statements language?

Yes. The communication explains that it may contain forward-looking statements identified by terms like “anticipates,” “believes,” and “expects.” It notes these statements depend on economic, industry, and operating assumptions, and that actual results may differ materially if those underlying factors change.

Which regulatory forms does Sabesp use for its annual reports?

Sabesp indicates that it files its annual reports under Form 20-F with the U.S. Securities and Exchange Commission. This classification confirms its status as a foreign private issuer while maintaining ongoing disclosure obligations for international investors in its securities.

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 December, 2025

(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 BÁSICO DO ESTADO DE SÃO PAULO – SABESP

Publicly-held Company

CNPJ No. 43.776.517/0001-80

NIRE No. 35.3000.1683-1

MATERIAL FACT

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp (“Company” or “Sabesp”), in compliance with the provisions of Resolution No. 44, dated August 23, 2021, as amended, issued by the Brazilian Securities Commission (“CVM”), hereby informs its shareholders and the market in general that, at a meeting held on December 18, 2025, the Company’s Board of Directors unanimously approved, without any restrictions or reservations:

(i) the payment of interest on equity to the Company’s shareholders, in the total gross amount equivalent to R$ 1,798,000,000.00 (one billion, seven hundred and ninety-eight million reais) (“JCP’’); and

(ii) the increase of the Company’s capital stock in the amount of R$ 2,810,000,000.00 (two billion, eight hundred and ten million reais), within the limit of the authorized capital, pursuant to article 3, paragraphs 3 and 5 of its Bylaws, through the capitalization of part of the balance of the Company’s profits reserves, upon the issuance of 20,264,000 (twenty million, two hundred and sixty-four thousand) new registered, book-entry common shares with no par value, to be distributed to the Company’s shareholders pursuant to article 169 of the Brazilian Corporations Law (“Capital Increase”), at the ratio of 0.029646975 new common shares for each common share they hold in the final shareholding position on December 23, 2025.

Additional information regarding the resolutions mentioned above can be found in the minutes of the Board of Directors’ meeting held on December 18, 2025 and in the respective notice to shareholders and notice to the market disclosed in accordance with applicable regulations, all available at the Company’s headquarters and on its Investor Relations website (https://ri.sabesp.com.br/), as well as on the websites of B3 S.A. – Brasil, Bolsa, Balcão (www.b3.com.br) and the Brazilian Securities Commission (www.cvm.gov.br).

São Paulo, December 19, 2025

DANIEL SZLAK

Chief Financial 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: December 19, 2025

Companhia de Saneamento Básico do Estado de São Paulo - SABESP
By:	/s/  Daniel Szlak
	Name: Daniel Szlak 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.