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 October, 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-hr06102025engexe

City of Buenos Aires, October 6th, 2025 Messrs. Comisión Nacional de Valores (CNV) Messrs. Bolsas y Mercados Argentinos S.A. (BYMA) Messrs. A3 Mercados S.A. (A3) Presente 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, and July 24, 2025. On this date, our controlling shareholder, Intercement Participações S.A. has announced that the Creditors’ Meeting held today approved a Judicial Reorganization Plan (the “Plan”). The Plan reflects the agreement in principle disclosed in the Relevant Event published on July 24, 2025. Among the key terms of the Plan, is the potential sale of Loma Negra’s shares and the entry of a group of creditors as holders of the entire shareholding control of the InterCement Group (for further information of the Plan, please visit https://investidores.intercement.com.br). The Plan must be ratified by the Court overseeing the Judicial Reorganization process in São Paulo, Brazil, and approved by the competent authorities. As previously informed, Loma Negra is not part of 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.