OBRASCÓN HUARTE LAIN, S.A. (“OHLA” or the “Company”), pursuant to article 226 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

INSIDE INFORMATION

Following the communications of inside information published by the Company on 10 September 2024, on 20 September 2024 and on 7 October 2024 (with official registry numbers 2,380, 2,386 and 2,405, respectively) and the communications of other relevant information published by the Company on 16 September 2024, 4 October 2024 and 11 October 2024 (with official registry numbers 30,513, 30,786 and 30,877, respectively), the Company announces that the Company’s subsidiary OHL Operaciones, S.A.U. (the “Issuer”) has requested holders of its Split Coupon Senior Secured Notes due 2026 (ISIN: XS2356570239)/ (ISIN: XS2356571120) (the “Notes” and the “Noteholders”) their approval to certain temporary consents and waivers to the terms and conditions of the Notes to allow the delay in the payment of the 15 September coupon under the Notes until 31 October 2024 while the negotiations between the Company and its stakeholders towards entering into a lock-up agreement are ongoing, pursuant to the terms of a consent solicitation memorandum prepared by the Issuer (the “Consent Solicitation Memorandum”).

Noteholders can obtain a copy of the Consent Solicitation Memorandum from The Bank of New York Mellon SA/NV Dublin Branch.

Pursuant to the Consent Solicitation Memorandum, the deadline for submission by Noteholders of Electronic Consent Instructions (as defined in the Consent Solicitation Memorandum) is 5:00 p.m. (Central European Time) on 17 October 2024, unless it is extended, re-opened or terminated as provided in the Consent Solicitation Memorandum.

Madrid 14 October 2024.