Sabesp (NYSE: SBS) plans 1-for-5 stock split pending shareholder vote

Rhea-AI Filing Summary

Sabesp plans a 1-for-5 stock split of its common shares, subject to approval at an Extraordinary Shareholders’ Meeting on April 28, 2026. Each existing common share will become five common shares without changing the total amount of the company’s share capital.

If approved, Sabesp’s Brazilian custodian will automatically credit the additional common shares to investors holding stock on B3, while Bank of New York Mellon will issue and distribute additional American Depositary Receipts to NYSE investors. The company states that proportional ownership and all economic and voting rights, including dividend entitlements, will remain unchanged after the split.

Key Figures

Stock split ratio: 1:5 Shareholder meeting date: April 28, 2026 Capital impact: No change +1 more

4 metrics

Stock split ratio 1:5 Each 1 common share will become 5 common shares

Shareholder meeting date April 28, 2026 Extraordinary Shareholders’ Meeting to vote on stock split

Capital impact No change Total share capital remains unchanged after stock split

Rights impact Unchanged Dividend, voting and economic rights remain the same

Key Terms

stock split, Extraordinary Shareholders’ Meeting, American Depositary Receipts, forward-looking statements

4 terms

stock split financial

"submit for approval the stock split of all common shares 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 Shareholders’ Meeting financial

"At the Extraordinary Shareholders’ Meeting to be held on April 28, 2026"

An extraordinary shareholders’ meeting is a special gathering called outside the regular annual meeting to vote on urgent or significant company matters, such as large mergers, major asset sales, changes to control, or amendments to governing rules. Think of it as a town-hall called when something important arises that owners must approve; investors should pay attention because outcomes can change a company’s strategy, value, or their ownership stakes quickly.

American Depositary Receipts financial

"As for the ADRs trading in the New York Stock Exchange"

A certificate traded on U.S. markets that represents ownership of shares in a foreign company, letting U.S. investors buy and sell that company as if it were listed domestically. Think of it as a local voucher for a foreign product: it makes price quotes in dollars, trades on familiar exchanges, and brings differences in liquidity, fees and legal protections that can affect returns and risk compared with buying the underlying foreign shares directly.

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.

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

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FAQ

What stock split is Sabesp (SBS) proposing?

Sabesp is proposing a 1-for-5 stock split, turning each existing common share into five new common shares. The transaction is designed to increase the number of shares without altering the company’s overall share capital or changing any shareholder rights or entitlements.

When will Sabesp’s stock split be decided?

The stock split will be submitted for approval at an Extraordinary Shareholders’ Meeting on April 28, 2026. Shareholders voting at this meeting will decide whether to authorize the 1-for-5 split of all common shares while keeping the company’s total share capital unchanged.

How will Sabesp’s stock split affect ADR holders on the NYSE?

For NYSE investors, Bank of New York Mellon will issue and distribute additional American Depositary Receipts reflecting the 1-for-5 split. ADR holders will receive new receipts so that their economic interest, voting power and rights to dividends and other distributions remain proportionally identical.

Does Sabesp’s stock split change shareholder ownership or rights?

The company states the stock split will not change any shareholder’s proportional ownership in Sabesp. After the 1-for-5 split, investors will hold more shares or ADRs, but each will carry the same economic, voting, dividend and distribution rights as before the transaction.

Will Sabesp’s total share capital change with the stock split?

No, Sabesp specifies that the total amount of its share capital will remain the same after the 1-for-5 stock split. The split only increases the number of issued common shares and corresponding ADRs, leaving the aggregate capital invested in the company unchanged.

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
PUBLICLY HELD COMPANY
NIRE 35.300.016.831
CNPJ nº 43.776.517/0001-80

MATERIAL FACT

Companhia de Saneamento Básico do Estado de São Paulo S.A. (“Sabesp” or “Company”) in compliance with the terms set forth in Resolution No. 44, of August 23, 2021, as amended, of the Brazilian Securities and Exchange Commission (“CVM”), further to the material fact disclosed by the Company on March 27, 2026, hereby informs its shareholders and the market in general of the following:

At the Extraordinary Shareholders’ Meeting to be held on April 28, 2026, the Company will submit for approval the stock split of all common shares at a ratio of 1:5 by means of which each 1 (one) common share will represent 5 (five) common shares, with no change to the amount of the Company’s share capital. If approved, the following steps and dates will be relevant in relation to the Company’s common shares and American Depositary Receipts (“ADRs”).

1. As for the common shares trading on the Brazilian Stock Exchange (B3 S.A. – Brasil, Bolsa, Balcão, or “B3”), the custodian institution, Itaú Unibanco S.A., shall take all measures to automatically distribute the new common shares to the Company’s shareholders, according to the following schedule:

· for shareholders holding ownership interest as of April 28, 2026, each of the Company’s common shares trading at B3 shall be split into 5 (five) common shares or, in other words, the shareholder shall receive 4 (four) new common shares for each common share held, holding, after the split, 5 (five) common shares;

· as of April 29, 2026, the Company’s common shares will be traded ex-split rights (B3 ex-date);

· on April 30, 2026 four (4) additional common shares will be credited for each existing common share, which will be reflected in shareholders’ ownership positions at the opening of trading on May 4, 2026.

2. As for the ADRs trading in the New York Stock Exchange (“NYSE”), the depositary institution, The Bank of New York Mellon (“BNY”), shall issue new ADRs and distribute them to the holders of the ADR, as per the schedule applicable in the United States of America:

· the ADR to common share ratio will remain unchanged at one (1) ADR representing one (1) common share. No fractional ADRs will be issued;

· as of April 30, 2026 (record date), the holders of the Company’s ADRs at the NYSE shall be entitled to the new ADRs, at the ratio of 4 (four) additional ADRs to each ADR already held;

· on May 6, 2026, the additional ADRs shall be distributed to the Company’s ADR holders at the NYSE (payment date);

· as of May 7, 2026, the Company’s ADRs trading at NYSE shall be traded ex-split rights (NYSE ex-date);

· from April 30, 2026 through May 7, 2026, BNY’s books will be closed for issuance and cancellation between the Brazilian and U.S. Stock Exchanges (B3 and NYSE). However, the Company’s common shares and ADRs will continue to be regularly traded on their respective markets.

The stock split will not result in any change in the proportional ownership interest of the shareholders in the Company’s share capital. The resulting common shares and ADRs will grant their respective holders the same rights attributed to the currently existing common shares and ADRs, including with respect to the distribution of dividends and/or interest on equity and other distributions that may be made by the Company.

The Company will keep its shareholders and the market duly informed of the developments of this matter, in accordance with applicable regulations.

São Paulo, April 27, 2026

DANIEL SZLAK
Chief Financial Officer and Investors 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 27, 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.