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 connection with the communication of inside information 28 June 20214 (with register numbers 2299) related to the non-binding offer received from Atitlan Grupo Empresarial SL (“AT”) by OHLA (“the Offer”) in relation to the agreed capital increase, it is hereby reported that:

The Board of Director of the Company agreed to request from AT certain clarifications of the Offer to adopt a resolution, placing itself at its available to hold the appropriate discussion for this purpose and to be able to choose between the different existing options.

AT has informed OHLA that the Offer has expired without an agreement.

OHLA continues working with the other existing alternatives in defense of the social interest.

Madrid, 15 July, 2024

José María del Cuvillo Pemán

Non-Director Deputy Secretary to the Board of Directors