Presentation of Financial and Other InformationForward-Looking InformationPART IItem 1.Identity of Directors, Senior Management and AdvisersItem 2.Offer Statistics and Expected TimetableItem 3.Key InformationItem 4.Information on the CompanyItem 4A.Unresolved Staff CommentsItem 5.Operating and Financial Review and ProspectsItem 6.Directors, Senior Management and EmployeesItem 7.Major Shareholders and Related Party TransactionsItem 8.Financial InformationItem 9.The Offer and ListingItem 10.Additional InformationItem 11.Quantitative and Qualitative Disclosures About Market RiskItem 12.Description of Securities Other than Equity SecuritiesPART IIItem 13.Defaults, Dividend Arrearages and DelinquenciesItem 14.Material Modifications to the Rights of Security Holders and Use of ProceedsItem 15.Controls and ProceduresItem 16.[Reserved]Item16A.Audit Committee Financial ExpertItem16B.Code of EthicsItem16C.Principal Accountant Fees and ServicesItem16D.Exemptions from the Listing Standards for Audit CommitteesItem16E.Purchases of Equity Securities by the Issuer and Affiliated PurchasersItem 16F.Change in Registrant’s Certifying AccountantItem16G.Corporate GovernanceItem16H.Mine Safety DisclosureItem 16I.Disclosure Regarding Foreign Jurisdictions that Prevent InspectionsItem 16J.Insider Trading PoliciesItem16K.CybersecurityPART IIIItem 17.Financial StatementsItem 18.Financial StatementsItem 19.Exhibit IndexTECHNICAL GLOSSARY Presentation of Financial and Other Information In this annual report, TIM S.A. (formerly known as Intelig Telecomunicações Ltda., or “Intelig”), a publicly-held company(sociedade anônima) organized under the laws of the Federative Republic of Brazil, is referred to as “TIM” or the “Company.”References to “we,” “us” and “our” are to TIM together with, where the context so requires and as explained more fully below, CozaniRJ Infraestrutura e Rede de Telecomunicações S.A. (“SPE Cozani” or “Cozani”) which was merged into the Company on April 1,2023, TIM Participações S.A. (“TIM Participações”), our prior parent holding company, which was merged into the Company inSeptember 2020, TIM Celular S.A. (“TIM Celular”), which was merged into the Company in October 2018, TIM Sul S.A. (“TIMSul”) and TIM Nordeste Telecomunicações S.A. (“TIM Nordeste”), both of which merged into the Company in May 2005.Collectively, these transactions are referred to herein as the (“Reorganization”). References in this annual report to the “common shares” are to the common shares of TIM. References to the “AmericanDepositary Shares” or “ADSs” are to TIM’s American Depositary Shares, each representing five common shares. The ADSs areevidenced by “American Depositary Receipts,” or “ADRs,” which are listed on the New York Stock Exchange, or the “NYSE”, underthe symbol “TIMB.” Market Share Data We calculate market share information based on information provided by Brazil’s National Telecommunications Agency (AgênciaNacional de Telecomunicações) (“ANATEL”). We calculate penetration data based on information provided by the Brazilian Instituteof Geography and Statistics (Instituto Brasileiro de Geografia e Estatística) (“IBGE”). Presentation of Financial Information We maintain our books and records inreais. The financial statements included in this annual report were prepared in accordancewith IFRS Accounting Standards as issued by the International Accounting Standards Board (IASB) (“financial statements”). As acomplement to the IFRS principles, the Company also applies accounting practices established under Brazilian corporate law and rulesissued by the Securities and Exchange Commission of Brazil (Comissão de Valores Mobiliários) (“CVM”), for the Brazilian StockMarket Exchange and ANATEL to comply with the regulatory requirements. The preparation of financial statements in accordance with IFRS requires the use of certain critical accounting estimates. It alsorequires management to exercise its judgment in the process of applying our accounting policies. Those areas involving a higherdegree of judgment or complexity, or areas where assumptions and estimates are significant to the financial statements, are disclosedin Note 3 to our financial statements. All references herein to the “real,” “reais” or “R$” are to the Brazilianreal, the official currency of Brazil. All references to “U.S.dollars,” “dollars” or “U.S.$” are to United States dollars. Solely for the convenience of the reader, we have translated some amounts included elsewhere in this annual report fromreaisinto U.S. dollars using the commercial selling exchange rate as reported by the Central Bank of Brazil (Banco Central do Brasil)(“Central Bank”), on December 31, 2025, of R$5.5024 to U.S.$1.00. These translations should not be considered representations thatany such amounts have been, could have been or could be converted into U.S. dollars at that or at any other exchange rate. Suchtranslations should not be construed as representations that therealamounts repre