Business Context and Reporting Period
This Form 6-K filing by Companhia de Saneamento Básico do Estado de São Paulo (SABESP) reports a Material Fact regarding a rate adjustment authorized by ARSESP Resolution No. 1,748/2025. The filing was signed on December 3, 2025, and references a prior disclosure made on December 2, 2025. The company operates as a publicly-held basic sanitation provider in the State of São Paulo, Brazil.
Key Financial Metrics and Rate Adjustment Details
The filing details a total equilibrium rate increase of 10.65% (including taxes). The breakdown of this adjustment is as follows:
- Total Equilibrium Rate Increase (with taxes): 10.65%
- Total before taxes: 10.26%
- Inflation Component (IPCA Jul/24 to Oct/25): 6.11%
- Delta PIS COFINS: 0.36%
- Market Effects: 3.41%
- Lag in RAB Recognition: 3.54%
- Opex Impact: 1.42%
- Compensatory Adjustment (4th cycle): -5.37%
- Non-Manageable Expenses: -0.41%
- Regulatory Asset Base Remuneration: 0.63%
- Other Financial Items: 0.68%
- Equilibrium Rate Adjustment (real terms): 0.50%
The average adjustment applied to users is calculated at 6.5%, derived from the inflation component and the Delta PIS COFINS.
Material Changes and Drivers
Key drivers for the rate adjustment include:
- Positive Drivers: A correction for timing mismatches in RAB recognition since August 2024, improved Opex due to increased connections and volume from universalization anticipation, and market effects related to consumption mix.
- Negative Drivers: A significant reduction of 5.37% due to compensatory adjustments for the 4th cycle (2021–2024), including judicial demands and reforms. Additionally, non-manageable expenses decreased by 0.41%, primarily due to the end of rate coverage for the Alto Tietê PPP (impact of -R$130 million).
Guidance, Outlook, and Risks
The filing contains standard forward-looking statements regarding future economic circumstances, industry conditions, and company performance. Management notes that statements regarding dividends, capital expenditure plans, and operating strategies are subject to risks and uncertainties. There is no guarantee that expected trends will occur. The filing does not provide specific numerical guidance for future revenue or profit beyond the rate adjustment mechanics described.
Investor Verification Checklist
- Verify the effective date of the new rates and the timeline for implementation.
- Confirm the impact of the -R$130 million Alto Tietê PPP rate coverage end on future cash flows.
- Review the details of the 4th cycle compensatory adjustments and judicial demands causing the -5.37% reduction.
- Assess the sustainability of the volume growth driving the Opex improvement.
- Monitor the actual inflation (IPCA) trajectory against the 6.11% used in the calculation.