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___

Companhia de Saneamento Básico do Estado de São Paulo CEO’s Office R. Costa Carvalho, 300 – Pinheiros – CEP 05429-900 – São Paulo - SP Phone: (11) 3388-8000 www.sabesp.com.br

COMPANHIA DE SANEAMENTO BÁSICO DO ESTADO DE SÃO PAULO - SABESP

Corporate Taxpayer’s ID (CNPJ): 43.776.517/0001-80

Company Registry (NIRE): 35.3000.1683-1

EXCERPT FROM THE MINUTES OF THE 1004th BOARD OF DIRECTORS' MEETING

On March 21, 2024, at 9:00 a.m., the undersigned members of the Company’s Board of Directors listed below met at the call of the Chair of the Board of Directors, Karla Bertocco Trindade, on an ordinary basis, according to the main section and paragraph 6 of article 13 of the Bylaws of Companhia de Saneamento Básico do Estado de São Paulo – SABESP (“Company”), located at Rua Costa Carvalho, no. 300, Pinheiros, in the city and state of São Paulo, to resolve on the agenda below. Justified absence of the Board member Antonio Julio Castiglioni Neto. The remote participation of the Board members Eduardo Person Pardini and Nerylson Lima da Silva was recorded.

(...)

Following, the Chair of the Board of Directors offered the floor to the People and Corporate Management Officer, Sabrina de Menezes Correa Furstenau Sabino, and the People Superintendent, Nilton João dos Santos, who, accompanied by the Manager of the Labor Relations Department, Ana Cristina Russo Nascimento, presented item 10 on the agenda, “Institutional Policy for the Compensation of Management, Fiscal Council members, and members of the Statutory Committees – PI0034 – V. 5”, (time: 10’), based on Management Resolution 0089/2024, of 03/13/2024, the CH Executive Summary 04/2024, of 03/11/2024, the From/To, the draft of the Institutional Policy and the respective exhibit, and the PowerPoint document, all of which made available on the meeting electronic platform. After being discussed and voted on, under item VII, sub-item “g” of article 14 of the Company’s Bylaws, version 5 of the Institutional Policy for the Compensation of Management, Fiscal Council members, and members of the Statutory Committees was unanimously approved.

(...)

Minutes signed by the attending Board of Directors members Karla Bertocco Trindade, Anderson Márcio de Oliveira, André Gustavo Salcedo Teixeira Mendes, Eduardo Person Pardini, Karolina Fonsêca Lima, Marcelo Munhoz Auricchio, Mario Engler Pinto Junior, Nerylson Lima da Silva, and Ronaldo Coppa.

This is a free English translation of the excerpt of the minutes drawn up in the book of Minutes of the Board of Directors’ Meetings.

São Paulo, March 22, 2024.