Oi S A : Material Fact - Statement on the Continuity of the Oi Group

Oi S.A. - In Judicial Reorganization CNPJ/MF no. 76.535.764/0001-43 NIRE 33.3.0029520-8

Publicly Traded Company

MATERIAL FACT

Statement on the Continuity of the Oi Group

Oi S.A. - In Judicial Reorganization ("Oi" or "Company"), in compliance with the provisions of Article 157, Paragraph 4, of Law No. 6,404/76 and Resolution CVM no. 44/2021, and in continuation of the Material Facts disclosed on September 30, 2025, October 2, 2025, and October 31, 2025, hereby informs its shareholders and the market in general of the following.

Due to the court decision rendered on October 31, 2025, by the 7th Business Court of the District of the Capital of the State of Rio de Janeiro ("Judicial Reorganization Court"), in the records of the Essential Public Services Transition Incident no. 0960108-88.2025.8.19.0001, involving the Company and its subsidiaries Portugal Telecom International Finance B.V. - In Judicial Reorganization and Oi Brasil Holdings Coöperatief U.A. - In Judicial Reorganization (together, the "Reorganization Companies"), Mr. Bruno Rezende, Judicial Manager of the Reorganization Companies, and the Company filed a petition on this date, arguing, in conclusion, for the possible characterization of the Oi Group's state of insolvency, either due to the impossibility of supporting the payment of all post-petition liabilities (passivo extraconcursal), or due to non-compliance with the Judicial Reorganization Plan in force, and the Oi Group's inability to promote measures to maximize its cash flow. In the event of judicial liquidation of the Reorganization Companies, the Judicial Manager submitted for consideration by the Judicial Reorganization Court the provision contained in item XI of article 99 of Law No. 11,101/2005, to determine the provisional continuation of the Oi Group's activities until the full transfer of all services currently under the responsibility of the Reorganization Companies is completed, authorizing the maintenance of all physical and personnel structures sufficient to ensure the full execution of all services until their effective transition.

The full text of the petition is available to shareholders and creditors on the Company's websites (https://www.oi.com.br/ri and https://recjud.com.br) and on the CVM's Empresas.NET System (https://www.cvm.gov.br).

The Company will keep its shareholders and the market informed about the progress of the judicial reorganization process, in accordance with applicable laws and regulations.

Rio de Janeiro, November 7, 2025.

Oi S.A. - In Judicial Reorganization

by Bruno Galvão Souza Pinto de Rezende