Companhia De Saneamento De Minas GeraisBMFBOVESPA: CSMG3

‎Material Fact - Resignation of the Chairman of the Board of Directors

· Issued by Companhia de Saneamento de Minas Gerais
COMPANHIA DE SANEAMENTO DE MINAS GERAIS - COPASA MG

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

CORPORATE TAXPAYER'S ID (CNPJ/MF): 17.281.106/0001-03

MATERIAL FACT RESIGNATION OF THE CHAIRMAN OF THE BOARD OF DIRECTORS

Companhia de Saneamento de Minas Gerais - COPASA MG (B3: CSMG3) ("COMPANY" or "COPASA"), in compliance with the provisions of CVM Resolution No. 44/2021, hereby informs its shareholders and the market in general that it has received from Mr. Hamilton Amadeo, Chairman of the Company's Board of Directors, his request for resignation as a member of that Board, effective immediately.

Belo Horizonte, February 12, 2026.

Adriano Rudek de Moura

Chief Financial and Investor Relations Officer

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