OBRASCÓN HUARTE LAIN, S.A. (“OHLA” or the “Company”), pursuant to article 227 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

RELEVANT INFORMATION

Following the communication of inside information published by the Company on 10 September 2024 (with official registry number 2,380) the Company announces that on the date hereof the Company’s subsidiary OHL Operaciones, S.A.U. (the “Issuer”) has decided to amend the terms of the consent solicitation memorandum published by the Issuer on 10 September 2024 (the “Consent Solicitation Memorandum”) by means of which it requested holders of its Split Coupon Senior Secured Notes due 2026 (ISIN: XS2356570239)/ (ISIN: XS2356571120) (the “Notes” and the “Noteholders”) their approval to certain waivers to the terms and conditions of the Notes. The Issuer has made available a supplement to the Consent Solicitation Memorandum on 16 September 2024 for the purposes of extending the deadline for submission by Noteholders of Electronic Consent Instructions which is set to 5:00 p.m. (Central European Time) on 19 September 2024, unless further extended, re-opened or terminated as provided in the Consent Solicitation Memorandum.

Madrid 16 September 2024.