SABESP (NYSE: SBS) director files initial Form 3 ownership statement

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP director Gustavo Rocha Gattass filed an initial Form 3 statement of beneficial ownership. The filing reports no insider transactions, no buy or sell activity, and no listed derivative positions, indicating a purely administrative disclosure.

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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

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1. Name and Address of Reporting Person^*

Rocha Gattass Gustavo

(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 Gustavo Rocha Gattass	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)

FAQ

What does the SABESP (SBS) Form 3 filing by Gustavo Rocha Gattass report?

The Form 3 for SABESP reports director Gustavo Rocha Gattass’s initial beneficial ownership status. It shows no reported transactions, no buy or sell activity, and no derivative positions, making this a routine administrative disclosure rather than a trading event.

Did Gustavo Rocha Gattass buy or sell SABESP (SBS) shares in this Form 3?

No, the Form 3 shows zero buy, sell, acquire, or dispose transactions. All transaction counts and share amounts in the summary are zero, indicating no trading activity is being reported in connection with this initial ownership statement.

What is the role of Gustavo Rocha Gattass at SABESP (SBS) in this filing?

The filing identifies Gustavo Rocha Gattass as a director of SABESP. He is not listed as an officer or ten-percent owner in this report, so the Form 3 serves to record his status as a board-level insider for regulatory purposes.

Does the SABESP (SBS) Form 3 show any derivative securities for Gustavo Rocha Gattass?

No, the Form 3 shows an empty derivativeSummary and zero derivative transaction counts. This indicates that, in this filing, there are no options, warrants, or other derivative positions reported for director Gustavo Rocha Gattass.

Is the SABESP (SBS) Form 3 filing a trading signal for investors?

This Form 3 is not a trading signal because it reports no purchases, sales, or other share movements. It is a routine regulatory step to record Gustavo Rocha Gattass as a director-level insider without disclosing any concurrent transactions.