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 July, 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.

notificacinhronengvf

City of Buenos Aires, July 22nd, 2025 Messrs. Comisión Nacional de Valores (CNV) Messrs. Bolsas y Mercados Argentinos S.A. (BYMA) Messrs. A3 Mercados S.A. Ref.: LOMA NEGRA C.I.A.S.A. – Relevant Event Dear Sirs, We are writing in order to comply with section 2, Chapter I, Title XII of the CNV Rules (2013 revised version). We hereby inform that LOMA NEGRA C.I.A.S.A. (the “Company”) today closed the public placement of its negotiable bonds Class 5, under its program of negotiable bonds (not convertible into shares) for up to US$ 500,000,000. The notice showing the results was published today before the Comisión Nacional de Valores (CNV), Bolsas y Mercados Argentinos S.A. (BYMA) and A3 Mercados S.A. We hereby inform the relevant information of the results: • Face Value of the Negotiable Bonds Class 5 to be issued: US$ 112,878,134. • Interest Rate: 8.00%. • Issuance Price: 100% of face value. • Issuance and Liquidation Date: July 24th, 2025. • Maturity: 24 months from the Issue and Settlement Date. • Amortization: Bullet. • Interests: Six-monthly. Sincerely, ___________________ Marcos Isabelino Gradin Investor Relations Officer