SABESP (SBS) Engineering Officer sells 5,900 shares, holding 76 after trade

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Engineering Officer Roberval Tavares de Sousa reported an open-market sale of 5,900 Common Shares. The shares were sold at an average price of R$28.81 per share on May 25, 2026. After this transaction, he directly holds 76 Common Shares.

Insider Trade Summary

Net Seller: 5,900 shares

Net Sell 1 txn

Insider Tavares de Sousa Roberval

Role Engineering Officer

Sold 5,900 shs ($170K)

Type	Security	Shares	Price	Value
Sale	Common Shares	5,900	$28.81	$170K

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

Key Figures

Shares sold: 5,900 shares Sale price: R$28.81 per share Shares held after sale: 76 shares +1 more

4 metrics

Shares sold 5,900 shares Open-market sale of Common Shares

Sale price R$28.81 per share Average price for the 5,900-share sale

Shares held after sale 76 shares Direct ownership following the transaction

Transaction date May 25, 2026 Date of the reported open-market sale

Key Terms

Open-market sale, Common Shares, Form 4, non-derivative

4 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.

Form 4 regulatory

"INSIDER FILING DATA (Form 4)"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

non-derivative financial

"transaction_type: "non-derivative""

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

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 05/29/2026 - 03:04 PM Learn about SEC filing dates

FAQ

What insider transaction did SABESP (SBS) report for Roberval Tavares de Sousa?

SABESP reported that Engineering Officer Roberval Tavares de Sousa sold 5,900 Common Shares in an open-market transaction. The sale was disclosed in a Form 4 and reflects a reduction in his directly held share position.

At what price were the SABESP (SBS) shares sold by the Engineering Officer?

The 5,900 SABESP Common Shares were sold at an average price of R$28.81 per share. This price reflects the consideration received per share in the open-market sale reported in the Form 4 filing.

How many SABESP (SBS) shares does the insider hold after this sale?

Following the sale, Engineering Officer Roberval Tavares de Sousa directly holds 76 SABESP Common Shares. This post-transaction balance is reported in the Form 4 as the total number of Common Shares owned directly.

Was the SABESP (SBS) insider transaction a buy or sell action?

The SABESP insider transaction was a sell action. The Form 4 identifies it as an open-market sale of 5,900 Common Shares, coded as an “S” transaction and classified as a non-derivative disposal.

Did the SABESP (SBS) Form 4 involve any derivative securities?

The Form 4 transaction involved only non-derivative Common Shares. The derivativeSummary section is empty, indicating no options, warrants, or other derivative securities were exercised, converted, or otherwise transacted in this particular filing.

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)

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	$28.81	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:

	/s/ Beatriz Caroline de Sousa Daher, as attorney-in-fact for Roberval Tavares de Souza	05/29/2026
	** 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)