City of Buenos Aires, March 15th, 2024 Messrs. Comisión Nacional de Valores (CNV) Messrs. Bolsas y Mercados Argentinos S.A. (BYMA) Messrs. Mercado Abierto Electrónico S.A. (MAE) Ref.: LOMA NEGRA C.I.A.S.A. – Relevant Event Dear Sirs, We are writing in accordance with Section 2 of Chapter I, Title XII of the Argentine National Securities Commission (“Comisión Nacional de Valores”) Regulations (2013 revised version) regarding the share repurchase plan that was approved by the Board of Directors of Loma Negra Compañía Industrial Argentina S.A. (the “Company”). In this regard, we inform that during the period from March 11th to March 15th 2024, the Company purchased 39,974 of its own American Depositary Receipt (ADR), each representing 5 common shares of the Company, as detailed below: Acquisition date American Depositary Receipt (ADR) Average Price Total Amount March 11th, 2024 12,100 USD 6.63 USD 80,244 March 12th, 2024 12,100 USD 6.68 USD 80,789 March 13th, 2024 12,100 USD 6.93 USD 83,853 March 14th, 2024 3,674 USD 6.85 USD 25,167 Sincerely. Marcos I. Gradin Investor Relations Officer LOMA NEGRA C.I.A.S.A.