Sabesp (SBS) relations & sustainability officer sells 5,700 shares

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP Institutional Relations & Sustainability Officer Samanta I.S. Tavares de Sousa executed an open-market sale of 5,700 Common Shares on May 21, 2026, at an average price of $5.72 per share.

Following this transaction, the officer directly holds 43 Common Shares. A footnote states this price is equivalent to R$28.61 per share, using an exchange rate of R$5.0046 per U.S.$1.00 reported by the Brazilian Central Bank on May 21, 2026.

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 ($33K)

Type	Security	Shares	Price	Value
Sale	Common Shares	5,700	$5.72	$33K

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

Footnotes (1)

1. F1. Equivalent to R$28.61 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0046 per U.S.$1.00 as reported by Brazilian Central Bank on May 21, 2026.

Key Figures

Shares sold: 5,700 shares Sale price: $5.72 per share Post-transaction holdings: 43 shares +2 more

5 metrics

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

Sale price $5.72 per share Average price for Common Shares sold

Post-transaction holdings 43 shares Common Shares held directly after sale

BRL equivalent price R$28.61 per share Footnote currency conversion for sale price

Exchange rate R$5.0046 per US$1.00 Rate reported by Brazilian Central Bank on May 21, 2026

Key Terms

open-market sale, Common Shares, exchange rate, Brazilian Central Bank

4 terms

open-market sale financial

"transaction_action is described as an 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 is listed as 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

"Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0046"

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.

Brazilian Central Bank financial

"as reported by Brazilian Central Bank on May 21, 2026"

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/17/2026 - 04:22 PM Accepted by SEC EDGAR 06/17/2026 - 04:21 PM Learn about SEC filing dates

FAQ

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

SABESP reported that its Institutional Relations & Sustainability Officer, Samanta I.S. Tavares de Sousa, sold 5,700 Common Shares in an open-market transaction on May 21, 2026, as disclosed in the amended Form 4.

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

The 5,700 SABESP Common Shares were sold at an average price of $5.72 per share. A footnote states this equals R$28.61 per share using a R$5.0046 per U.S.$1.00 exchange rate on May 21, 2026.

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

After selling 5,700 Common Shares, the officer directly holds 43 SABESP Common Shares. This post-transaction holding figure is disclosed in the filing’s ownership table as total shares following the transaction.

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

The SABESP insider transaction was a sale. The Form 4/A lists transaction code “S,” describes it as an open-market sale, and classifies the transaction direction as “sell” for 5,700 Common Shares.

Does the SABESP (SBS) Form 4/A mention any currency conversion details?

Yes. A footnote explains that the $5.72 per-share sale price is equivalent to R$28.61, based on an exchange rate of R$5.0046 per U.S.$1.00 reported by the Brazilian Central Bank on May 21, 2026.

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)
05/27/2026

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	05/21/2026		S		5,700	D	$5.72(1)	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:

1. Equivalent to R$28.61 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0046 per U.S.$1.00 as reported by Brazilian Central Bank on May 21, 2026.

Remarks:

This Form 4/A amends the Form 4 filed on May 27, 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 Samanta Ivonete Salvador Tavares de Sousa	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)