Sabesp CFO sells 7,381 shares in open market

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Financial Officer Daniel Szlak reported selling a total of 7,381 common shares on June 15, 2026 in open-market transactions.

Accepted by SEC EDGAR 06/17/2026 - 04:19 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Financial Officer Daniel Szlak reported selling a total of 7,381 common shares on June 15, 2026 in open-market transactions. The shares were sold at prices of about $5.58 and $5.59 per share, based on amounts converted from Brazilian reais.

Insider Trade Summary

Net Seller: 7,381 shares

Net Sell 2 txns

Insider Szlak Daniel

Role Chief Financial Officer

Sold 7,381 shs ($41K)

Share of Position Sold 100%

Type	Security	Shares	Price	Value
Sale	Common Shares	7,300	$5.59	$41K
Sale	Common Shares	81	$5.58	$451.98

Holdings After Transaction: Common Shares — 0 shares (Direct)

Holdings Before and After: Common Shares, 7,381 to 0 shares (Direct)

Other Insiders: 2 other insiders reported open-market sales of this stock in the 30 days up to this filing.

Footnotes (2)

1. F1. Equivalent to R$28.30 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0611 per U.S.$1.00 as reported by Brazilian Central Bank on June 15, 2026.
2. F2. Equivalent to R$28.23 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0611 per U.S.$1.00 as reported by Brazilian Central Bank on June 15, 2026.

Key Figures

Total shares sold: 7,381 shares Sale price (first lot): $5.58 per share Sale price (second lot): $5.59 per share +5 more

8 metrics

Total shares sold 7,381 shares Aggregate common shares sold by CFO on June 15, 2026

Sale price (first lot) $5.58 per share Price for 81 common shares sold, converted from R$28.30

Sale price (second lot) $5.59 per share Price for 7,300 common shares sold, converted from R$28.23

Brazilian price (first lot) R$28.30 per share Local currency equivalent for the first reported sale

Brazilian price (second lot) R$28.23 per share Local currency equivalent for the second reported sale

FX rate used R$5.0611 per US$1.00 Brazilian Central Bank rate on June 15, 2026 for conversion

Number of sale transactions 2 transactions Both coded “S” as open-market or private sales

Net share change -7,381 shares Net-sell direction from transaction summary

Key Terms

open-market sale, Form 4/A, Chief Financial Officer, exchange rate, +1 more

5 terms

open-market sale financial

"transaction_action is described as an open-market sale of common shares"

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.

Form 4/A regulatory

"The insider activity is disclosed in an amended Form 4/A filing"

Form 4/A is an amended filing that corrects or updates an earlier Form 4, the mandatory report that insiders (like company executives, directors, or large shareholders) must file when their ownership stakes change. Think of it as an edited receipt showing who bought or sold stock and when; investors use it to track insider confidence, detect potential conflicts, and spot trading patterns that might signal future company prospects.

Chief Financial Officer financial

"Daniel Szlak is identified as the Chief Financial Officer of Sabesp"

A Chief Financial Officer (CFO) is the person in charge of a company's money and financial planning. They decide how to spend, save, and invest funds to help the company grow and stay stable. Their role is important because good financial decisions keep the company healthy and successful.

exchange rate financial

"Amounts were converted at an exchange rate of R$5.0611 per US$1.00"

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.

non-derivative financial

"Each transaction is classified as a non-derivative common share transaction"

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 reported that its Chief Financial Officer, Daniel Szlak, sold 7,381 common shares on June 15, 2026 in open-market transactions. The filing classifies both trades with code “S,” indicating sales in the market or private transactions.

How many Sabesp (SBS) shares did CFO Daniel Szlak sell and on what date?

CFO Daniel Szlak sold a total of 7,381 Sabesp common shares on June 15, 2026. The transactions were split into two sales, one for 81 shares and another for 7,300 shares, both reported as open-market sales.

At what prices were the Sabesp (SBS) shares sold in the CFO’s Form 4/A?

The reported sales occurred at prices of $5.58 and $5.59 per share. These U.S. dollar values were derived from Brazilian real prices of R$28.30 and R$28.23 per share using a stated exchange rate.

What exchange rate did Sabesp (SBS) use to convert the share prices in this filing?

The filing states that amounts were converted using an exchange rate of R$5.0611 per U.S.$1.00, as reported by the Brazilian Central Bank on June 15, 2026. This rate was applied to translate the original Brazilian real share prices into U.S. dollars.

How many separate sale transactions are reported in this Sabesp (SBS) Form 4/A?

The Form 4/A reports two separate sale transactions. One transaction involved 81 common shares, and the other involved 7,300 common shares, both coded “S” and described as sales in the open market or private transactions.

What role does the reporting person hold at Sabesp (SBS) in this Form 4/A?

The reporting person, Daniel Szlak, is identified as Sabesp’s Chief Financial Officer. His officer status is explicitly noted in the filing, and the reported transactions involve his direct ownership of Sabesp common shares.

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

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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^*

Szlak Daniel

(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)
	Chief Financial Officer

2a. Foreign Trading Symbol
[SBSP3]

3. Date of Earliest Transaction (Month/Day/Year)
06/15/2026

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)
06/16/2026

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	06/15/2026		S		7,300	D	$5.59(1)	81	D
Common Shares	06/15/2026		S		81	D	$5.58(2)	0	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$28.30 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0611 per U.S.$1.00 as reported by Brazilian Central Bank on June 15, 2026.

2. Equivalent to R$28.23 per share. Amounts presented were converted into U.S. dollars at the exchange rate of R$5.0611 per U.S.$1.00 as reported by Brazilian Central Bank on June 15, 2026.

Remarks:

This Form 4/A amends the Form 4 filed on June 16, 2026 to: (i) correct the price per share reported in Table I; (ii) correct the amount of securities beneficially owned following the transaction reported in Line 1 of Table I; and (iii) correct the signature block to reflect the proper reporting person. 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 Daniel Szlak	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)