SABESP officer reports RSU holdings in Form 3

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP officer Rafael Costa Strauch filed an initial Form 3 reporting holdings of restricted stock units.

Accepted by SEC EDGAR 03/19/2026 - 06:23 AM EDT

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Form Type

Rhea-AI Filing Summary

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP officer Rafael Costa Strauch filed an initial Form 3 reporting holdings of restricted stock units. Each RSU represents one common share. One grant covers 6,291 underlying shares and another covers 6,095, with both vesting in equal installments from 2026 through 2030, subject to continued service.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Costa Strauch Rafael

Role New Bus. & Projects Officer

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

Holdings After Transaction: Restricted Stock Units — 12,386 contracts (Direct)

Footnotes (3)

F1. Each restricted stock unit ("RSU") represents the contingent right to receive one Common Share.
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.
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 SABESP (SBS) Form 3 filed by Rafael Costa Strauch report?

The Form 3 reports Rafael Costa Strauch’s initial holdings of restricted stock units in SABESP. It lists two RSU grants tied to common shares and describes their vesting schedules, rather than showing any new purchases or sales of stock.

How many SABESP common shares are linked to the reported RSU grants?

The filing shows one restricted stock unit grant linked to 6,291 underlying common shares and another linked to 6,095 underlying common shares. Each RSU represents the contingent right to receive one SABESP common share if the vesting conditions are satisfied.

When do Rafael Costa Strauch’s SABESP RSU grants begin and finish vesting?

One RSU grant, awarded April 29, 2025, vests pro rata on May 1 of 2026, 2027, 2028 and 2029. A second grant, awarded December 19, 2025, vests pro rata on January 1 of 2027, 2028, 2029 and 2030, assuming continued service.

What role does Rafael Costa Strauch hold at SABESP according to the Form 3?

The Form 3 identifies Rafael Costa Strauch as SABESP’s New Business & Projects Officer. The reported restricted stock units are compensation-linked awards associated with this officer role rather than evidence of open-market buying or selling of SABESP shares.

Do the SABESP RSUs reported in the Form 3 pay anything before vesting?

The RSUs represent a contingent right to receive SABESP common shares, not immediate cash or stock. Shares are only deliverable after each vesting date is reached and the continued service condition is met, based on the schedules described in the footnotes.

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
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

Costa Strauch Rafael

(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)
	New Bus. & Projects 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)
1. Title of Derivative Security (Instr. 4)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	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)
Restricted Stock Units	⁽²⁾	⁽²⁾	Common Shares	6,291	⁽¹⁾	D
Restricted Stock Units	⁽³⁾	⁽³⁾	Common Shares	6,095	⁽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 Rafael Costa Strauch	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)

Source: View Original Filing on SEC EDGAR