Sabesp officer sells 5,900 shares in open market

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP reported that Engineering Officer Roberval Tavares de Sousa sold 5,900 Common Shares in an open-market transaction on May 25, 2026 at $5.74 per share.

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP reported that Engineering Officer Roberval Tavares de Sousa sold 5,900 Common Shares in an open-market transaction on May 25, 2026 at $5.74 per share.

After this sale, he directly holds 76 Common Shares. The reported sale price is equivalent to R$28.81 per share, using an exchange rate of R$5.0174 per U.S.$1.00 as quoted by the Brazilian Central Bank on May 25, 2026.

Insider Trade Summary

Net Seller: 5,900 shares

Net Sell 1 txn

Insider Tavares de Sousa Roberval

Role Engineering Officer

Sold 5,900 shs ($34K)

Type	Security	Shares	Price	Value
Sale	Common Shares	5,900	$5.74	$34K

Holdings After Transaction: Common Shares — 76 shares (Direct)

Footnotes (1)

1. F1. Equivalent to R$28.81 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0174 per U.S.$1.00 as reported by Brazilian Central Bank on May 25, 2026.

Key Figures

Shares sold: 5,900 shares Sale price per share (USD): $5.74 per share Sale price per share (BRL): R$28.81 per share +2 more

5 metrics

Shares sold 5,900 shares Open-market sale on May 25, 2026

Sale price per share (USD) $5.74 per share Common Shares sold on May 25, 2026

Sale price per share (BRL) R$28.81 per share Equivalent price stated in footnote

Exchange rate R$5.0174 per U.S.$1.00 Brazilian Central Bank on May 25, 2026

Shares held after transaction 76 shares Directly held Common Shares post-sale

Key Terms

open-market sale, Common Shares, exchange rate

3 terms

open-market sale financial

"transaction_action: "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Shares financial

"security_title: "Common Shares""

Common shares are the basic units of ownership in a company that give holders a claim on profits and a right to vote on key matters, like electing the board. Think of them as membership cards in a club: they let you share in successes and losses, but in a bankruptcy or liquidation they are paid after creditors and preferred shareholders, so their value can swing more and matters for assessing risk and potential return.

exchange rate financial

"exchange rate of R$5.0174 per U.S.$1.00 as reported"

Exchange rate is the price of one currency expressed in another—for example, how many euros you receive for one US dollar. It matters to investors because changes in that price alter the reported profits, costs and value of assets for companies and portfolios that operate or hold money across borders; think of it like switching measurement units, where the same item can look bigger or smaller depending on the unit used.

FAQ

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

What insider transaction did SABESP (SBS) disclose in this Form 4/A?

SABESP disclosed that Engineering Officer Roberval Tavares de Sousa executed an open-market sale of 5,900 Common Shares. The transaction occurred on May 25, 2026 at a price of $5.74 per share, significantly reducing his directly held position.

At what price were the SABESP (SBS) shares sold in the reported insider trade?

The 5,900 SABESP Common Shares were sold at $5.74 per share. A footnote states this equals R$28.81 per share, based on a Brazilian Central Bank exchange rate of R$5.0174 per U.S.$1.00 on May 25, 2026.

How many SABESP (SBS) shares does the insider hold after this Form 4/A sale?

Following the reported sale, Engineering Officer Roberval Tavares de Sousa directly holds 76 SABESP Common Shares. Before the transaction he held 5,976 shares, so this open-market sale represents most of his directly owned position according to the filing data.

What role does the reporting person hold at SABESP (SBS)?

The reporting person, Roberval Tavares de Sousa, is identified as an officer of SABESP with the title Engineering Officer. The Form 4/A associates this executive role with the disclosed open-market sale of 5,900 SABESP Common Shares on May 25, 2026.

How was the SABESP (SBS) sale price converted from Brazilian reais to U.S. dollars?

The filing states the R$28.81 per-share sale price was converted using an exchange rate of R$5.0174 per U.S.$1.00. This rate was reported by the Brazilian Central Bank on May 25, 2026, and underpins the disclosed U.S. dollar price of $5.74 per share.

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

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Accepted by SEC EDGAR 06/17/2026 - 04:23 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Tavares de Sousa Roberval

(Last) (First) (Middle)

300 COSTA CARVALHO STREET

(Street)

SAO PAULO 05429-900

(City) (State) (Zip)

BRAZIL

(Country)

2. Issuer Name and Ticker or Trading Symbol
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP [ SBS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Engineering Officer

2a. Foreign Trading Symbol
[SBSP3]

3. Date of Earliest Transaction (Month/Day/Year)
05/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)
05/29/2026

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Shares	05/25/2026		S		5,900	D	$5.74(1)	76	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Equivalent to R$28.81 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0174 per U.S.$1.00 as reported by Brazilian Central Bank on May 25, 2026.

Remarks:

This Form 4/A amends the Form 4 filed on May 29, 2026 to correct the price per share reported in Table I. Due to the issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Securities Exchange Act of 1934 (the "Act"), the reporting person's transactions in the issuer's equity securities are exempt from Sections 16(b) and 16(c) of the Act.

	/s/ Beatriz Caroline de Sousa Daher, as attorney-in-fact for Roberval Tavares de Souza	06/17/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)