COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Initial Statement of Beneficial Ownership

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP reported the initial equity holdings of officer Maciel Maia Denis, Customer & Technology Officer.

Accepted by SEC EDGAR 03/19/2026 - 06:30 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP reported the initial equity holdings of officer Maciel Maia Denis, Customer & Technology Officer. The filing lists two direct awards of restricted stock units (RSUs), each representing the right to receive one common share.

One RSU grant covers 8,086 underlying common shares, granted on April 29, 2025, vesting in equal parts on May 1 of 2026, 2027, 2028 and 2029, subject to continued service. A second RSU grant covers 7,830 underlying common shares, granted on December 19, 2025, vesting pro rata on January 1 of 2027, 2028, 2029 and 2030, also subject to continued service as an officer.

Insider Trade Summary

Holdings reported, no transactions

Holdings

Insider Maciel Maia Denis

Role Customer & Technology Officer

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

Holdings: Restricted Stock Units — 15,916 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.

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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
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Maciel Maia Denis

(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)
	Customer & Technology 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	8,086	(1)	D
Restricted Stock Units	(3)	(3)	Common Shares	7,830	(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 Denis Maciel Maia	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)