Companhia De Saneamento De Minas GeraisBMFBOVESPA: CSMG3

Notice to the Market - Shareholders Remuneration

· Issued by Companhia de Saneamento de Minas Gerais


Companhia de Saneamento de Minas Gerais

COMPANHIA DE SANEAMENTO DE MINAS GERAIS COPASA MG

PUBLICLY-HELD COMPANY COMPANY REGISTRY (NIRE): 313.000.363-75



-03

NOTICE TO THE MARKET SHAREHOLDER REMUNERATION

Companhia de Saneamento de Minas Gerais

COPASA MG Meeting held today approved shareholder remuneration referring to the 1stquarter of 2026 (1Q26). The approval is in line with the current Dividend Policy and with the decision of the Board of Directors which, at a meeting held on December 11, 2025, set an annual distribution of 50% of adjusted net income for the 2026 fiscal year, as disclosed in the Material Fact released on that date. The details are set out below:

  1. Interest on Equity IoE
    1. Total Amount: R$177,603,258.93 (one hundred and seventy-seven million, six hundred and three thousand, two hundred and fifty-eight reais and ninety-three cents).
    2. Amount per share: R$0.4683859622 per share. The Withholding Income Tax will be deducted from the source value, pursuant to applicable legislation. Net amounts will be paid to shareholders, except for those who are provenly immune or exempt from it.
    3. Credit Date (Cut-Off Date): 03.23.2026.

      1.4. - 03.24.2026.
      1. Payment Date: 05.11.2026.
      2. Reference: 1Q26, and it will be considered as the mandatory dividend for fiscal year 2026.

  2. Additional information: Companhia de Saneamento de Minas Gerais

    COPASA MG. Rua Mar de Espanha, 525, Bairro Santo Antônio, CEP 30330-900. Belo Horizonte - MG, Phone: +55 31 3250-2015, E-mail: ir@copasa.com.br.

Belo Horizonte, March 12, 2026.

Adriano Rudek de Moura

Chief Financial and Investor Relations Officer