SABESP CEO reports 199,777 RSUs and share holdings

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP CEO Leone Piani Carlos Augusto filed an initial ownership report showing his equity interests.

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP CEO Leone Piani Carlos Augusto filed an initial ownership report showing his equity interests. He holds 199,777 Restricted Stock Units, each representing the right to receive one Common Share, plus 2,877 Common Shares directly and 2,877 Common Shares indirectly through his spouse.

The RSUs were granted on April 29, 2025 and will vest in equal portions on May 1 of each year from 2026 through 2033, subject to his continued service as an officer of the company.

Insider Trade Summary

3 transactions reported

Mixed 3 txns

Insider Leone Piani Carlos Augusto

Role CEO

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

Holdings After Transaction: Restricted Stock Units — 199,777 contracts (Direct); Common Shares — 2,877 shares (Direct); Common Shares — 2,877 shares (Indirect, By Spouse)

Footnotes (2)

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, May 1, 2029, May 1, 2030, May 1, 2031, May 1, 2032 and May 1, 2033, subject to continued service as an officer of the issuer.

FAQ

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

What insider ownership does the CEO report in SABESP (SBS) Form 3?

The CEO reports 199,777 Restricted Stock Units and 2,877 Common Shares held directly, plus 2,877 Common Shares held indirectly through his spouse. This Form 3 establishes his initial reported equity position in SABESP as an officer.

How many SABESP (SBS) Restricted Stock Units does the CEO hold?

The CEO holds 199,777 Restricted Stock Units, each representing the contingent right to receive one Common Share. This RSU position forms the largest part of his reported equity interest in SABESP under the initial ownership statement.

What is the vesting schedule of the SABESP (SBS) CEO’s RSUs?

The RSUs were granted on April 29, 2025 and will vest pro rata on May 1, 2026, 2027, 2028, 2029, 2030, 2031, 2032 and 2033. Vesting is conditioned on the CEO’s continued service as an officer of SABESP.

How many SABESP (SBS) Common Shares does the CEO own directly and indirectly?

The CEO reports 2,877 Common Shares held directly and 2,877 Common Shares held indirectly through his spouse. These reported holdings are in addition to his 199,777 RSUs linked to SABESP Common Shares in the Form 3 filing.

What does each SABESP (SBS) Restricted Stock Unit represent for the CEO?

Each Restricted Stock Unit represents the contingent right to receive one SABESP Common Share. This means the CEO’s 199,777 RSUs correspond to potential future delivery of an equal number of Common Shares, subject to the stated vesting and service conditions.

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

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Accepted by SEC EDGAR 03/19/2026 - 06:22 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

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Leone Piani Carlos Augusto

(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)
	CEO

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)
Common Shares	2,877	D
Common Shares	2,877	I	By Spouse

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	199,777	(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, May 1, 2029, May 1, 2030, May 1, 2031, May 1, 2032 and May 1, 2033, 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 Carlos Augusto Leone Piani	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)