Sabesp (SBS) IR & Sustainability Officer sells 5,700 shares in open-market trade

Rhea-AI Filing Summary

Sabesp insider Tavares de Sousa Samanta I.S., the Investor Relations and Sustainability Officer, reported an open-market sale of 5,700 Common Shares at $28.61 per share on May 21, 2026. After this transaction, the officer directly holds 43 Common Shares.

Insider Trade Summary

Net Seller: 5,700 shares

Net Sell 1 txn

Insider Tavares de Sousa Samanta I.S.

Role Inst. Rel. & Sustain. Officer

Sold 5,700 shs ($163K)

Type	Security	Shares	Price	Value
Sale	Common Shares	5,700	$28.61	$163K

Holdings After Transaction: Common Shares — 43 shares (Direct)

Key Figures

Shares sold: 5,700 shares Sale price per share: $28.61 per share Shares held after transaction: 43 shares +1 more

4 metrics

Shares sold 5,700 shares Open-market sale on May 21, 2026

Sale price per share $28.61 per share Common Shares transaction

Shares held after transaction 43 shares Direct ownership post-sale

Transaction code S Open-market or private sale classification

Key Terms

open-market sale, Common Shares, Form 4, transaction code "S"

4 terms

open-market sale financial

"reported an open-market sale of 5,700 Common Shares at $28.61 per share"

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

"reported an open-market sale of 5,700 Common Shares at $28.61 per share"

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

"and was disclosed in a Form 4 insider trading report"

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.

transaction code "S" regulatory

"The transaction was a sale of shares, classified with transaction code “S”"

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Form 4 Insider Transactions: What Each Field Means →

Accepted by SEC EDGAR 05/27/2026 - 04:10 PM Learn about SEC filing dates

FAQ

What did Sabesp (SBS) insider Tavares de Sousa Samanta I.S. report?

Tavares de Sousa Samanta I.S. reported selling 5,700 Sabesp Common Shares. The transaction was an open-market sale at $28.61 per share on May 21, 2026, and was disclosed in a Form 4 insider trading report.

How many Sabesp (SBS) shares were sold in this Form 4 filing?

The filing shows an open-market sale of 5,700 Sabesp Common Shares. This transaction reduced the reporting officer’s direct holdings, leaving 43 Common Shares directly owned after the sale, according to the disclosed post-transaction balance.

At what price were the Sabesp (SBS) shares sold by the officer?

The 5,700 Sabesp Common Shares were sold at an average price of $28.61 per share. This price reflects the transaction value reported in the Form 4 for the open-market or private sale on May 21, 2026.

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

Following the reported sale, the officer directly holds 43 Sabesp Common Shares. This post-transaction holding figure is disclosed in the Form 4 and represents the remaining direct ownership after the 5,700-share disposition.

What role does the insider hold at Sabesp (SBS)?

The reporting person, Tavares de Sousa Samanta I.S., serves as Sabesp’s Investor Relations and Sustainability Officer. This executive role is identified in the Form 4 and explains why the transaction qualifies as a reportable insider trade.

Was this Sabesp (SBS) insider transaction a purchase or a sale?

The transaction was a sale of shares, not a purchase. The Form 4 classifies it with code “S” as an open-market or private sale, and the transaction_summary shows 5,700 shares sold and a net-sell direction.

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 Samanta I.S.

(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)
	Inst. Rel. & Sustain. Officer

2a. Foreign Trading Symbol
[SBSP3]

3. Date of Earliest Transaction (Month/Day/Year)
05/21/2026

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	05/21/2026		S		5,700	D	$28.61	43	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 Samanta Ivonete Salvador Tavares de Sousa	05/27/2026
	** 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)