SEC Form 6-K filed by Companhia de saneamento Basico Do Estado De Sao Paulo - Sabesp
PURSUANT TO RULE 13a-16 OR 15d-16 OF THE
São Paulo, S.P., 05429-900
Federative Republic of Brazil
annual reports under cover Form 20-F or Form 40-F.
Form 20-F ___X___ Form 40-F ______
in paper as permitted by Regulation S-T Rule 101(b)(1)__.
in paper as permitted by Regulation S-T Rule 101(b)(7)__.
Indicate by check mark whether the registrant by furnishing the
information contained in this Form is also thereby furnishing the
information to the Commission pursuant to Rule 12g3-2(b) under
the Securities Exchange Act of 1934.
Yes ______ No ___X___
registrant in connection with Rule 12g3-2(b):

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO – SABESP
PUBLICLY-HELD COMPANY
CNPJ 43.776.517/0001-80
NIRE No. 35.3000.1683-1
MATERIAL FACT
Companhia de Saneamento Básico do Estado de São Paulo – Sabesp ("Company") in compliance with the provisions of the Resolution of the Brazilian Securities and Exchange Commission ("CVM") No. 44, of August 23, 2021, as amended, and in continuity with the Material Fact disclosed on July 22, 2025, informs its shareholders and the market in general that, in 2025, it made investments totaling R$ 15.2 billion in water supply and sewage system infrastructure works, amount in preliminary and non-audited version.
The investments made in 2025 were 2.2x higher than those made in 2024 (R$ 6,9 billion), with investments accelerating in 2H25 and increasing 36% versus 1H25.
As a result, the Company:
| · | Surpassed all its U-Factor(1) targets for the year, as follows: |
| o | Water Economies (ICA): 664,161 new economies, 152% of the 2024–2025 target |
| o | Sewage Economies (ICE): 781,464 new economies, 133% of the 2024–2025 target |
| o | Units for Sewage Treatment (IEC): 1,372,105 new economies, 134% of the 2024–2025 target |
| · | Expanded access to water services for 1,819,342 people, sewage collection for 2,138,670 people, and sewage treatment for 3,759,534 people |
| · | Generated more than 40,000 direct and indirect jobs |
These results reinforce the Company’s commitment to achieving universal access to basic sanitation by 2029, ensuring that the entire population within the concession area of the URAE-1 Contract concession area has access to essential water and sewage services.
The Company will keep its shareholders and the market informed of any relevant updates related to the subject matter of this Material Fact.
São Paulo, February 4, 2026
DANIEL SZLAK
Chief Financial and Investor Relations Officer
| (1) | O número de economias e metas de Fator-U estão sujeitas à auditoria e validação do órgão regulador. |
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Companhia de Saneamento Básico do Estado de São Paulo - SABESP | ||
| By: | /s/ Daniel Szlak
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Name: Daniel Szlak
Title: Chief Financial Officer and Investor Relations Officer |
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