[6-K] COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Current Report (Foreign Issuer)

Rhea-AI Filing Summary

Companhia de Saneamento Básico do Estado de São Paulo – SABESP approved a 5-for-1 stock split of all its common shares at an Extraordinary General Meeting. Each existing common share will now correspond to five common shares, with no change to total share capital.

After the split, the company’s capital is divided into 3,524,534,025 book-entry common shares without par value and one special class preferred share held by the State of São Paulo. Shares trade ex-split from April 29, 2026, based on holders of record on April 28, 2026. Split shares are credited on April 30, 2026 and reflected in shareholder positions at market opening on May 4, 2026, carrying the same dividend and distribution rights as before.

Key Figures

Stock split ratio: 5-for-1 (1:5) Post-split common shares: 3,524,534,025 shares Special preferred share: 1 share +4 more

7 metrics

Stock split ratio 5-for-1 (1:5) Each 1 common share now represents 5 common shares

Post-split common shares 3,524,534,025 shares Total common shares after stock split

Special preferred share 1 share Special class preferred share held by State of São Paulo

Ex-split trading date April 29, 2026 Date shares start trading ex-split

Record date April 28, 2026 Shareholder position date for split entitlement

Credit date for split shares April 30, 2026 Date new shares are credited to shareholders

Position reflection date May 4, 2026 Date split reflected in shareholder positions at market open

Key Terms

Stock Split, Extraordinary General Meeting, special class preferred share, dividends and/or interest on equity, +1 more

5 terms

Stock Split financial

"approved the split of all common shares issued by the Company at a ratio of 1:5"

A stock split increases the number of a company's shares by dividing each existing share into multiple new shares while reducing the price per share by the same proportion, so an investor's total value and ownership percentage stay the same. It matters because lower per-share prices can make trading easier and attract more buyers, similar to breaking a large chocolate bar into smaller pieces to make it easier to share, which can boost liquidity and market interest.

Extraordinary General Meeting regulatory

"on this date, the Extraordinary General Meeting approved the split"

special class preferred share financial

"and 1 (one) special class preferred share held exclusively by the State of São Paulo"

dividends and/or interest on equity financial

"including participation in dividends and/or interest on equity and other distributions"

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.

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Form 6-K: How Foreign Companies Report to the SEC →

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

MATERIAL FACT

The Companhia de Saneamento Básico do Estado de São Paulo S.A. (“Sabesp” or the “Company”), in compliance with the provisions of the Brazilian Securities Commission Resolution No. 44, dated August 23, 2021, and further to the Material Facts disclosed on March 27, 2026 and April 27, 2026, hereby informs its shareholders and the market in general that, on this date, the Extraordinary General Meeting approved the split of all common shares issued by the Company at a ratio of 1:5, whereby each 1 (one) common share will now represent 5 (five) common shares, with no change to the share capital (“Stock Split”).

As a result of the Share Split, the Company's share capital will now be divided into 3,524,534,025 (three billion, five hundred twenty-four million, five hundred thirty-four thousand and twenty-five) common shares, all nominative, book-entry and without par value, and 1 (one) special class preferred share held exclusively by the State of São Paulo.

The Company's shares will be traded ex-split as of April 29, 2026, based on the shareholder position as of the record date of April 28, 2026. The shares resulting from the split will be credited to the respective shareholders on April 30, 2026 and , so they will be reflected in the shareholders' positions at the opening of the market on May 4, 2026. Such shares will grant their holders the same rights attributed to previously existing common shares, including participation in dividends and/or interest on equity and other distributions that may be declared by the Company after the present date.

São Paulo, April 28, 2026

DANIEL SZLAK

CFO and Head of Investor Relations

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 28, 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.

FAQ

What stock split did SABESP (SBS) approve in April 2026?

SABESP approved a 5-for-1 stock split of all its common shares, meaning each existing share is now represented by five shares, without changing total share capital. This increases the number of shares outstanding while keeping investors’ overall economic interest unchanged.

How many SABESP shares will be outstanding after the stock split?

Following the split, SABESP’s share capital is divided into 3,524,534,025 common shares and one special class preferred share held by the State of São Paulo. All common shares are nominative, book-entry and without par value, maintaining investors’ proportional ownership stakes.

When do SABESP shares start trading ex-split for the 2026 stock split?

SABESP shares begin trading ex-split on April 29, 2026. The record date for identifying eligible shareholders is April 28, 2026, so holdings on that date determine how many additional shares each investor receives from the 5-for-1 split.

When will SABESP’s split shares be credited to shareholders’ accounts?

The new SABESP shares from the stock split will be credited on April 30, 2026 and will appear in shareholder positions at the market opening on May 4, 2026. Investors will see their share counts adjusted to reflect the 5-for-1 split at that time.

Do SABESP’s new split shares have the same dividend rights as existing shares?

Yes. The shares issued in SABESP’s stock split grant holders the same rights as previously existing common shares, including participation in dividends, interest on equity and any other distributions that may be declared by the company after the effective date.

Does the SABESP stock split change the company’s share capital amount?

The stock split does not change SABESP’s total share capital amount. It only increases the number of common shares in which that capital is divided. Each investor holds more shares numerically, but their proportional ownership and the company’s overall capital remain the same.