Debora Pierini Longo - 01 May 2026 Form 4 Insider Report for COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP (SBS)

Reporting relationship: Operations & Maint. Officer
Issuer ticker: SBS
Reported as of: 01 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 15 May 2026, 13:44:43 UTC
Prior SEC filing: 19 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ Beatriz Caroline de Sousa Daher, as attorney-in-fact for Debora Pierini Longo

Key filing fact

Debora Pierini Longo filed Form 4 for COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP (SBS) on 15 May 2026.

Key facts

This page summarizes Debora Pierini Longo's Form 4 filing for COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP (SBS).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 15 May 2026, 13:44.

Change

Previous filing in this sequence was filed on 19 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002121093 Primary reporting owner

Pierini Longo Debora

Relationship: Operations & Maint. Officer
Address: 300 COSTA CARVALHO STREET, SAO PAULO, BRAZIL
Signature: /s/ Beatriz Caroline de Sousa Daher, as attorney-in-fact for Debora Pierini Longo
Signature date: 15 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

SBS transaction

Common Shares

Options Exercise

Transaction value
Shares: +8,243
Change %
Price
Shares after: 8,243
Date: 01 May 2026
Ownership: Direct
Footnotes: F1

SBS transaction

Common Shares

Tax liability

Transaction value
Shares: -2,267
Change %: -28%
Price: $6.69^*
Shares after: 5,976
Date: 01 May 2026
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

SBS transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -8,243
Change %: -25%
Price: $0.000000^*
Shares after: 24,729
Date: 01 May 2026
Ownership: Direct
Underlying class: Common Shares
Underlying amount: 8,243
Exercise price
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

On April 29, 2025, the reporting person was granted an aggregate of 32,965 restricted stock units ("RSUs"), vesting 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. Each RSU represents the contingent right to receive one Common Share of the Issuer upon vesting.

SEC remarks

All amounts reported in this Form 4 reflect certain recent events exempt from reporting under Section 16(a), namely (i) the receipt of rights to receive dividend equivalents (the accrual of which in this Form 4 upon vesting of the RSUs); (ii) the capital increase that occurred in March 2026; and (iii) the stock split approved by the Issuer's shareholders in April 2026. 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.