As of September 29, 2026, Companhia De Saneamento Basico Do Estado De Sao Paulo-Sabesp's top three insider holders are Piani Carlos Augusto Leone (Ceo, 1.09Mn shares), Domingues Luciane Godinho (Reg. Energy Proc. Officer, 224.40K shares), Maia Denis Maciel (Customer Technology Officer, 221.43K shares).
| # | Insider | Position | Direct | Indirect | Total | Share of Insiders | Last Filed |
|---|---|---|---|---|---|---|---|
| 1 | Piani Carlos Augusto Leone | Ceo | 1,093,920 | 0 | 1,093,920 | 46.7% | 15 May, 2026 |
| 2 | Domingues Luciane Godinho | Reg. Energy Proc. Officer | 224,400 | 0 | 224,400 | 9.6% | 15 May, 2026 |
| 3 | Maia Denis Maciel | Customer Technology Officer | 221,430 | 0 | 221,430 | 9.4% | 15 May, 2026 |
| 4 | Longo Debora Pierini | Operations Maint. Officer | 179,280 | 0 | 179,280 | 7.7% | 15 May, 2026 |
| 5 | Strauch Rafael Costa | New Bus. Projects Officer | 172,290 | 0 | 172,290 | 7.4% | 15 May, 2026 |
| 6 | Junior Josue Bressane | Chief People Officer | 160,320 | 0 | 160,320 | 6.8% | 15 May, 2026 |
| 7 | Valle Fehlberg Gustavo Do | Corporate Services Officer | 160,320 | 0 | 160,320 | 6.8% | 15 May, 2026 |
| 8 | Peralta Maria Alicia Lima | Chief Legal Officer | 131,340 | 0 | 131,340 | 5.6% | 15 May, 2026 |
| 9 | De Sousa Roberval Tavares | Engineering Officer | 76 | 0 | 76 | 0.0% | 17 Jun, 2026 |
| 10 | De Sousa Samanta I.S. Tavares | Inst. Rel. Sustain. Officer | 43 | 0 | 43 | 0.0% | 17 Jun, 2026 |
Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.
| Date | Insider | Position | Transaction | Shares | Price | Value | Shares Held After | Ownership |
|---|---|---|---|---|---|---|---|---|
| 25 May, 2026 | De Sousa Roberval Tavares | Engineering Officer | Disposed S | 5,900 | $5.74 | $33.87K | 76 | Direct |
| 21 May, 2026 | De Sousa Samanta I.S. Tavares | Inst. Rel. Sustain. Officer | Disposed S | 5,700 | $5.72 | $32.60K | 43 | Direct |
| 15 Jun, 2026 | Daniel Szlak | Chief Financial Officer | Disposed S | 7,300 | $5.59 | $40.81K | 81 | Direct |
| 15 Jun, 2026 | Daniel Szlak | Chief Financial Officer | Disposed S | 81 | $5.58 | $452 | 0 | Direct |
| 15 Jun, 2026 | Daniel Szlak | Chief Financial Officer | Disposed S | 7,300 | $28.30 | $206.59K | 0 | Direct |
| 15 Jun, 2026 | Daniel Szlak | Chief Financial Officer | Disposed S | 81 | $28.30 | $2.29K | 0 | Direct |
| 25 May, 2026 | De Sousa Roberval Tavares | Engineering Officer | Disposed S | 5,900 | $28.81 | $169.98K | 76 | Direct |
| 21 May, 2026 | De Sousa Samanta I.S. Tavares | Inst. Rel. Sustain. Officer | Disposed S | 5,700 | $28.61 | $163.08K | 43 | Direct |
| 01 May, 2026 | Daniel Szlak | Chief Financial Officer | Acquired M | 10,181 | — | — | 305,430 | Direct |
| 01 May, 2026 | Piani Carlos Augusto Leone | Ceo | Acquired M | 50,295 | — | — | 1,941,090 | Direct |
| 01 May, 2026 | Peralta Maria Alicia Lima | Chief Legal Officer | Acquired M | 6,039 | $0.00 | $0 | 181,170 | Direct |
| 01 May, 2026 | Junior Josue Bressane | Chief People Officer | Acquired M | 7,371 | — | — | 221,130 | Direct |
| 01 May, 2026 | Valle Fehlberg Gustavo Do | Corporate Services Officer | Acquired M | 7,371 | — | — | 221,130 | Direct |
| 01 May, 2026 | Maia Denis Maciel | Customer Technology Officer | Acquired M | 10,181 | — | — | 305,430 | Direct |
| 01 May, 2026 | De Sousa Roberval Tavares | Engineering Officer | Acquired M | 8,243 | — | — | 247,290 | Direct |
| 01 May, 2026 | Domingues Luciane Godinho | Reg. Energy Proc. Officer | Acquired M | 10,317 | — | — | 309,510 | Direct |
| 01 May, 2026 | Longo Debora Pierini | Operations Maint. Officer | Acquired M | 8,243 | — | — | 247,290 | Direct |
| 01 May, 2026 | Strauch Rafael Costa | New Bus. Projects Officer | Acquired M | 7,922 | — | — | 237,660 | Direct |
| 01 May, 2026 | Maia Denis Maciel | Customer Technology Officer | Disposed F | 2,800 | $0.22 | $624 | 221,430 | Direct |
| 01 May, 2026 | Peralta Maria Alicia Lima | Chief Legal Officer | Disposed F | 1,661 | $0.22 | $370 | 131,340 | Direct |