OBRASCÓN HUARTE LAIN, S.A. (“OHLA” or the “Company”), pursuant to article 227 of Law 6/2023, of 17 March, on the Securities Markets and the Investment Services, hereby notifies the Spanish National Securities Market Commission (Comisión Nacional del Mercado de Valores) “CNMV”) the following OTHER RELEVANT INFORMATION

Following the communications of other relevant information published by the Company on 2 and 10 December 2024 (with official registry numbers 31,590 and 31,695) in connection with the consent solicitation process related to the Company’s subsidiary OHL Operaciones, S.A.U. (the “Issuer”) Split Coupon Senior Secured Notes due 2026 (ISIN: XS2356570239 / XS2356571120) (the “Notes”) for the approval of resolutions (the “Noteholder Resolutions”) set out in the consent solicitation memorandum published by the Issuer on 2 December 2024 (the “Consent Solicitation Memorandum”), the Company announces that the Consent Solicitation process ended at 11.00 a.m. (CET) on the date hereof and has obtained the approval from holders (the “Noteholders”) representing more than 90 per cent. in aggregate principal amount outstanding of the Notes. Accordingly, the Noteholder Resolutions are binding on all Noteholders and the noteholders’ meeting, of which notice was given pursuant to the Consent Solicitation Memorandum, will not be required to be held. Noteholders are reminded that most of the Noteholder Resolutions will only be effective and implemented to the extent that the Recapitalisation is effective on the Recapitalisation Effective Date.

On the Recapitalisation Effective Date, the Recapitalisation Documents will be unconditionally effective in accordance with their respective terms and the Noteholder Resolutions will become fully effective. If the Recapitalisation is not implemented and the Recapitalisation Effective Date does not occur, or if the Lock-Up Agreement is terminated for any reason other than the occurrence of the Recapitalisation Effective Date, the Noteholder Resolutions will not become effective. Capitalised terms used in this announcement have the same meaning ascribed to them in the Consent Solicitation Memorandum.

Madrid 6 January 2025.