COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP Institutional Relations & Sustainability Officer Samanta I.S. Tavares de Sousa executed an open-market sale of 5,700 Common Shares on May 21, 2026, at an average price of $5.72 per share.
Following this transaction, the officer directly holds 43 Common Shares. A footnote states this price is equivalent to R$28.61 per share, using an exchange rate of R$5.0046 per U.S.$1.00 reported by the Brazilian Central Bank on May 21, 2026.
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Financial Officer Daniel Szlak reported selling a total of 7,381 common shares on June 15, 2026 in open-market transactions. The shares were sold at prices of about $5.58 and $5.59 per share, based on amounts converted from Brazilian reais.
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Financial Officer Daniel Szlak reported selling a total of 7,381 Common Shares of the company in open-market transactions at a price of $28.30 per share.
Two separate sales on June 15, 2026 covered 81 shares and 7,300 shares. After these transactions, Szlak’s directly held Common Shares reported in this filing decreased to zero, indicating he no longer shows a direct share position in this Form 4.
Sabesp reports changes to its Executive Board and organizational structure. The company created a new Customer Experience Directorate, led by Mr. Claudio Kawa Hermolin, who brings extensive experience in sanitation, infrastructure and large-scale project management and previously served as Director of Operations for the Eastern Regional Unit.
Ms. Débora Pierini Longo is leaving her role as Director of Operations and Maintenance to lead implementation of Sabesp’s Integrated Operations Center project. Mr. Roberval Tavares will temporarily hold both the Director of Engineering and Operation positions. The company states these changes align with its strategic focus on improving customer experience and operational efficiency.
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Engineering Officer Roberval Tavares de Sousa reported an open-market sale of 5,900 Common Shares. The shares were sold at an average price of R$28.81 per share on May 25, 2026. After this transaction, he directly holds 76 Common Shares.
Sabesp insider Tavares de Sousa Samanta I.S., the Investor Relations and Sustainability Officer, reported an open-market sale of 5,700 Common Shares at $28.61 per share on May 21, 2026. After this transaction, the officer directly holds 43 Common Shares.
Sabesp engineering officer Roberval Tavares de Sousa reported routine equity compensation activity involving restricted stock units and common shares. On May 1, 2026, he exercised RSUs to acquire 8,243 Common Shares, converting part of his derivative-based awards into direct share ownership.
To satisfy tax obligations, 2,267 Common Shares were withheld at $6.69 per share as a tax-withholding disposition, rather than an open-market sale. After these transactions, he directly held 5,976 Common Shares and 24,729 Restricted Stock Units. These RSUs stem from a prior grant of 32,965 units awarded on April 29, 2025, vesting in equal portions on May 1 of 2026, 2027, 2028 and 2029, contingent on his continued service as an officer.
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP New Business & Projects Officer Rafael Costa Strauch reported compensation-related equity activity, not open-market trading. On May 1, 2026, he exercised 7,922 Restricted Stock Units (RSUs) into the same number of Common Shares at a stated price of $0.00 per share. To cover tax obligations, 2,179 Common Shares were disposed of through a tax-withholding transaction at $6.69 per share, leaving him with 5,743 Common Shares held directly. The RSUs come from a grant of 31,685 RSUs awarded on April 29, 2025, vesting in four equal annual installments through May 1, 2029, with 23,761 RSUs remaining after this vesting event.
COMPANHIA DE SANEAMENTO BASICO DO ESTADO DE SAO PAULO-SABESP Chief Legal Officer Maria Alicia Lima Peralta reported routine equity compensation transactions. On May 1, 2026, she exercised 6,039 Restricted Stock Units into 6,039 Common Shares at a stated price of 0.00 per share.
To cover tax obligations, 1,661 Common Shares were disposed of in a tax-withholding transaction at 6.69 per share, leaving 4,378 Common Shares held directly after the disposition. Following the vesting, 18,122 Restricted Stock Units remain outstanding from a 24,142-unit grant awarded on April 29, 2025.
COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP regulatory and energy procurement officer Luciane Godinho Domingues exercised 10,317 restricted stock units into Common Shares on May 1, 2026. As part of this vesting event, 2,837 Common Shares were delivered back to the issuer to satisfy tax obligations, a tax-withholding disposition rather than an open-market sale.
Following these transactions, Domingues directly holds 7,480 Common Shares and 30,941 remaining restricted stock units. These RSUs come from a prior grant of 41,255 units awarded on April 29, 2025, which vest in four equal annual installments from May 1, 2026 through May 1, 2029, subject to continued service.