Sabesp officer reports RSU holdings in Form 3

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP engineering officer Roberval Tavares de Sousa filed a Form 3 reporting holdings of restricted stock units (RSUs) linked to common shares.

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP engineering officer Roberval Tavares de Sousa filed a Form 3 reporting holdings of restricted stock units (RSUs) linked to common shares. Each RSU gives the right to receive one common share if vesting conditions are met.

The filing lists RSUs covering 6,548 underlying common shares from a grant on April 29, 2025, vesting pro rata on May 1 of 2026, 2027, 2028 and 2029, subject to continued service. It also lists RSUs covering 6,344 underlying common shares from a December 19, 2025 grant, vesting pro rata on January 1 of 2027, 2028, 2029 and 2030, also subject to continued service. The Form 3 reflects compensation-related equity, not open-market buying or selling.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Tavares de Sousa Roberval

Role Engineering Officer

Type	Security	Shares	Price	Value
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--

Holdings After Transaction: Restricted Stock Units — 12,892 contracts (Direct)

Footnotes (3)

1. F1. Each restricted stock unit ("RSU") represents the contingent right to receive one Common Share.
2. F2. Represents RSUs granted on April 29, 2025, which will vest pro rata on each of May 1, 2026, May 1, 2027, May 1, 2028 and May 1, 2029, subject to continued service as an officer of the issuer.
3. F3. Represents RSUs granted on December 19, 2025, which will vest pro rata on each of January 1, 2027, January 1, 2028, January 1, 2029 and January 1, 2030, subject to continued service as an officer of the issuer.

FAQ

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

What does the Form 3 for Sabesp (SBS) report for Roberval Tavares de Sousa?

The Form 3 reports Roberval Tavares de Sousa’s initial holdings of restricted stock units (RSUs) in Sabesp. It lists two RSU awards tied to common shares, detailing the grant dates, the number of underlying shares, and multi-year vesting schedules contingent on continued service as an officer.

How many Sabesp (SBS) restricted stock units are reported in this Form 3?

The filing shows RSUs over 6,548 and 6,344 underlying common shares. One award covers 6,548 underlying shares from an April 29, 2025 grant, and another covers 6,344 underlying shares from a December 19, 2025 grant, each vesting in equal annual installments over four years.

What are the vesting terms of the Sabesp (SBS) RSUs reported?

The RSUs vest in equal annual installments over four years, subject to continued service. The April 29, 2025 grant vests on May 1 of 2026–2029, and the December 19, 2025 grant vests on January 1 of 2027–2030, assuming the officer remains in role.

Does the Sabesp (SBS) Form 3 show any insider share purchases or sales?

No insider share purchases or sales are reported in this Form 3. It only discloses compensation-related restricted stock units and their vesting schedules, with no open-market buy or sell transactions or derivative exercises indicated in the transaction summary.

What does each restricted stock unit (RSU) represent for Sabesp (SBS)?

Each Sabesp RSU represents a contingent right to receive one common share. The right becomes actual shares only if the RSUs vest according to their schedules, which require the officer to continue serving the company through the specified vesting dates.

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

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Accepted by SEC EDGAR 03/19/2026 - 06:14 AM Learn about SEC filing dates

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

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1. Name and Address of Reporting Person^*

Tavares de Sousa Roberval

(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)

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

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
Restricted Stock Units	(2)	(2)	Common Shares	6,548	(1)	D
Restricted Stock Units	(3)	(3)	Common Shares	6,344	(1)	D

Explanation of Responses:

1. Each restricted stock unit ("RSU") represents the contingent right to receive one Common Share.

2. Represents RSUs granted on April 29, 2025, which will vest pro rata on each of May 1, 2026, May 1, 2027, May 1, 2028 and May 1, 2029, subject to continued service as an officer of the issuer.

3. Represents RSUs granted on December 19, 2025, which will vest pro rata on each of January 1, 2027, January 1, 2028, January 1, 2029 and January 1, 2030, subject to continued service as an officer of the issuer.

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.

	/s/ Beatriz Caroline de Sousa Daher, as attorney-in-fact for Roberval Tavares de Sousa	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)