Oi S A : Material Fact - JR Plan update

Oi S.A. - In Judicial Reorganization

Federal Taxpayers' (CNPJ/ME) No. 76.535.764/0001-43

Board of Trade (NIRE) No. 33.3.0029520-8

Publicly-Held Company

MATERIAL FACT

Presentation of an updated version of the Judicial Reorganization Plan to the

General Creditors' Meeting

Oi S.A. - In Judicial Reorganization ("Oi" or "Company"), in accordance with Paragraph 4 of Article 157 of Law No. 6.404/1976 ("Brazilian Corporation Law") and the provisions of the Brazilian Stock and Exchange Commission ("CVM") Resolution No. 44/21, and further to the Material Facts disclosed on February 2 and 3, 2023, March 2 and 16, 2023 and February 06, 2024 and the Notices to the Market of September 13, 2023, November 14, 2023, December 5 and 11 2023, hereby informs its shareholders and the market in general that the Company, together with its subsidiaries Portugal Telecom International Finance B.V. - In Judicial Reorganization and Oi Brasil Holdings Coöperatief U.A. - In Judicial Reorganization ("Oi Group" or "JR Debtors"), presented on this date, to the General Creditors' Meeting, an updated version of the Judicial Reorganization Plan of JR Debtors ("Updated Plan"), which is available for shareholders and creditors review, with respective attachments, on the Company's websites(www.oi.com.br/ri ehttps://recjud.com.br).

The Updated Plan presented is the result of the continuity of extensive negotiations, maintained between the Company and its main creditors and other stakeholders, improvements and contributions from creditors, in relation to the version previously presented. This Updated Plan is also subject to analysis and assessment by creditors during the General Creditors' Meeting taking place today.

The Company will keep its shareholders and the market informed about the development of the matter related to this Material Fact.

Rio de Janeiro, March 25, 2024.

Oi S.A. - In Judicial Reorganization

Cristiane Barretto Sales

Chief Financial and Investor Relations Officer