Sabesp files 2025 Form 20-F annual report

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp filed its 2025 Form 20-F annual report for the year ended December 31, 2025 with the U.S. Securities and Exchange Commission.

Rhea-AI Filing Summary

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp filed its 2025 Form 20-F annual report for the year ended December 31, 2025 with the U.S. Securities and Exchange Commission. The filing includes the company’s complete audited financial statements.

The Form 20-F is available on both the SEC’s website and Sabesp’s investor relations website. Sabesp will also provide hard copies of its audited financial statements free of charge to any security holder who requests them by email.

Key Terms

Form 20-F, audited financial statements, forward-looking statements, dividends

4 terms

Form 20-F regulatory

"its annual report on Form 20-F for the fiscal year ended"

Form 20-F is the standardized annual disclosure that non-U.S. companies must file with the U.S. securities regulator when their shares are traded in the U.S.; it contains audited financial statements, a plain-language description of the business, management discussion, governance details and key risk factors. It matters to investors because it provides a consistent, comparable company “report card” and rulebook, helping buyers assess financial health, governance and risks before investing.

audited financial statements financial

"The 2025 Form 20-F, which includes the Company’s complete audited financial statements"

Audited financial statements are a company's financial reports—like its income, expenses, assets and debts—that have been examined and verified by an independent accountant to confirm they are accurate and complete. For investors, an audit is like having a trusted mechanic inspect a used car: it increases confidence that the financial picture is reliable, reduces the risk of hidden problems, and supports better decisions about valuing or trusting the company.

forward-looking statements regulatory

"This press release may contain forward-looking statements."

Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

dividends financial

"Statements regarding the declaration or payment of dividends"

Dividends are cash payments a company gives to its shareholders from profits or cash reserves, effectively sharing part of its earnings with owners. They matter to investors because they provide a steady income stream, act like an interest or rent payment on owning the stock, and signal management’s confidence in the business—factors that influence total return and share price. Regular or special dividends can change an investor’s income and reinvestment strategy.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

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

Sabesp announced that it has filed its 2025 Form 20-F annual report with the U.S. Securities and Exchange Commission. The report covers the fiscal year ended December 31, 2025 and includes the company’s complete audited financial statements for investors to review.

Where can investors access Sabesp’s 2025 Form 20-F audited financial statements?

Investors can access Sabesp’s 2025 Form 20-F on the SEC’s website at www.sec.gov. The company has also made the full annual report, including audited financial statements, available on its investor relations website at https://ri.sabesp.com.br for convenient online review.

How can Sabesp security holders request a hard copy of the 2025 financial statements?

Sabesp will provide hard copies of its complete audited financial statements free of charge to all security holders. Copies can be requested by contacting the company via email at dri@sabesp.com.br, and will be sent within a reasonable period after the request is received.

Which fiscal period does Sabesp’s 2025 Form 20-F cover?

Sabesp’s 2025 Form 20-F covers the fiscal year ended December 31, 2025. The report includes the company’s complete audited financial statements for that period, providing a comprehensive view of its financial position and performance during the 2025 fiscal year.

Does Sabesp’s announcement include any forward-looking statements?

Yes. The announcement notes that it may contain forward-looking statements based on management’s current views and estimates. These statements depend on various economic, market, industry, and operating factors, and actual results may differ materially if underlying assumptions or conditions change.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/30/2026 - 07:31 AM EDT Learn about SEC filing dates

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 April, 2026

(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

NIRE 35.300.016.831

CNPJ No. 43.776.517/0001-80

Public Company

NOTICE TO THE MARKET

FILING OF THE 2025 FORM 20-F

Companhia de Saneamento Básico do Estado de São Paulo – Sabesp (“Company” or “Sabesp”) hereby informs its shareholders and the market in general that it has filed with the Securities and Exchange Commission (“SEC”) its annual report on Form 20-F for the fiscal year ended December 31, 2025 (“2025 Form 20-F”).

The 2025 Form 20-F, which includes the Company’s complete audited financial statements, is available on the SEC’s website (www.sec.gov) and on the Company’s Investor Relations website (https://ri.sabesp.com.br).

The Company undertakes to provide all holders of its securities upon request and free of charge with a hard copy of its complete audited financial statements. Such copies will be provided upon request within a reasonable period of time following the request to dri@sabesp.com.br.

São Paulo, April 29, 2026.

Daniel Szlak

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: April 29, 2026

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.