Sabesp director files initial Form 3 report

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP director Claudia Polto da Cunha has filed an initial Form 3, which is a mandatory statement of beneficial ownership for insiders.

Accepted by SEC EDGAR 03/19/2026 - 06:32 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP director Claudia Polto da Cunha has filed an initial Form 3, which is a mandatory statement of beneficial ownership for insiders. This filing reports her status as a director and shows no reported share transactions or derivative positions.

FAQ

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

What does the Sabesp (SBS) Form 3 for Claudia Polto da Cunha show?

The Form 3 shows that Claudia Polto da Cunha is a director of Sabesp. It serves as her initial statement of beneficial ownership and, in this filing, does not report any share transactions or derivative holdings.

Does the Sabesp (SBS) Form 3 report any insider buying or selling?

This Form 3 does not report any insider buying or selling by Claudia Polto da Cunha. The transaction summary shows zero buy, sell, exercise, gift, tax withholding, or restructuring transactions, indicating no activity recorded in this filing.

Who is the reporting person in the Sabesp (SBS) Form 3 filing?

The reporting person is Claudia Polto da Cunha, identified as a director of Sabesp. As a director, she is required to file a Form 3 to disclose her beneficial ownership status when she becomes subject to insider reporting rules.

Are there any derivative securities reported in this Sabesp (SBS) Form 3?

No derivative securities are reported in this Form 3. The derivative summary is empty and the transaction summary shows zero derivative transactions, indicating no options, warrants, or similar instruments disclosed in this filing for the director.

Why is Sabesp (SBS) director Claudia Polto da Cunha filing a Form 3?

She is filing a Form 3 because, as a director of Sabesp, she must provide an initial statement of beneficial ownership. This establishes a baseline record of her position as an insider for future Form 4 or Form 5 transaction reporting.

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

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SEC Form 3

FORM 3

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

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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:			3235-0104
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hours per response:			0.5

1. Name and Address of Reporting Person^*

Polto da Cunha Claudia

(Last) (First) (Middle)

300 COSTA CARVALHO STREET

(Street)

SAO PAULO 05429-900

(City) (State) (Zip)

BRAZIL

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/18/2026

3. Issuer Name and Ticker or Trading Symbol
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP [ SBSP3 ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

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

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

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

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

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

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. Exhibit 24 - Power of Attorney.

No securities are beneficially owned.

	/s/ Beatriz Caroline de Sousa Daher, as attorney-in-fact for Claudia Polto da Cunha	03/18/2026
	** 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 5 (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 3: SEC 1473 (03-26)