OBRASCON HUARTE LAIN, S.A. (“OHLA” or the “Company”), pursuant to article 228 of the consolidated text of the Spanish Securities Market Act approved by Royal Legislative Decree 4/2015, of 23 October, hereby notifies the Spanish National Securities Market Commission (Comisión Nacional del Mercado de Valores) (“CNMV”) the following

DISCLOSURE OF OTHER RELEVANT INFORMATION

On Thursday 27 February 2025 before market opening OHLA will release the financial year 2024 results.

The management team of OHLA will hold a presentation for analysts & investors on the same day at 12:00h (Madrid time). This presentation could be followed live (both in Spanish and English) via webcast at: www.resultadosohla.com

Madrid, 25 February 2025