OBRASCÓN HUARTE LAIN, S.A. (“OHLA” or the “Company”), pursuant to the provisions of Article 226 of the Securities Markets and Investment Services Act and other implementing regulations, approved by Law 6/2023, of 17 March, hereby notifies to the Spanish National Securities Market Commission (Comisión Nacional del Mercado de Valores) (“CNMV”) the following

INSIDE INFORMATION NOTICE

In line with the Inside Information announced last June 28th 2024 to the CNMV with register number: 2299, regarding to the non-binding offers received by OHLA in relation to the agreed capital increase, it is hereby informed that:

Atitlan Grupo Empresarial, S.L. (“AT”) has decided to extend the validity of its non-binding offer for a period of 7 days until July 12th, 2024.

The Company is still analyzing and evaluating all the interest received without having accepted any offer for the time being.

Madrid, 05 July, 2024

D. José María del Cuvillo Pemán

Non-Director Deputy Secretary to the Board of Directors