6-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549

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FORM 6-K _______________

REPORT OF FOREIGN PRIVATE ISSUER

Pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934

For the month of December, 2025

Commission File Number: 001-38262

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LOMA NEGRA COMPAÑÍA INDUSTRIAL ARGENTINA SOCIEDAD ANÓNIMA (Exact Name of Registrant as Specified in its Charter)

LOMA NEGRA CORPORATION (Translation of Registrant’s name into English)

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Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F. Form 20-F ☒ Form 40-F

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):

This Form 6-K for Loma Negra Compañía Industrial Argentina Sociedad Anónima (or the “Company”) contains:

Exhibit 1:Relevant Event

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

ln-hr10122025eng

City of Buenos Aires, December 10th, 2025 Messrs. Comisión Nacional de Valores (CNV) Messrs. Bolsas y Mercados Argentinos S.A. (BYMA) Messrs. A3 Mercados S.A. (A3) 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) and following up with the information provided in the communications dated May 2, 2024, July 16 and 24, 2024, September 16 and 18, 2024, November 19, 2024, December 3, 2024, July 24, 2025 and October 6, 2025. On this date, our controlling shareholder, Intercement Participações S.A. has announced that the Court overseeing the Judicial Reorganization process in São Paulo, Brazil approved Judicial Reorganization Plan (the “Plan”) as previously disclosed in the Relevant Event published on October 6, 2025. The Court decision approving the Plan is available at: https://investidores.intercement.com.br/recuperacao-judicial/. As previously informed, Loma Negra is not a party to the Judicial Reorganization process. Therefore, the approval of the Plan does not affect our rights and obligations, nor our operations, which will continue to be carried out as usual. Loma Negra will keep its investors and the market informed and reiterates its commitment to transparency in the market. Sincerely, Marcos I. Gradin Investor Relations Officer LOMA NEGRA C.I.A.S.A.