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”) of the following

INSIDE INFORMATION

Following the communications of inside information published by the Company on 10 September 2024, 20 September 2024, 7 October 2024 and 14 October 2024 (with official registry numbers 2,380, 2,386, 2,405 and 2,406, respectively) and the communications of other relevant information published by the Company on 16 September 2024, 4 October 2024, 11 October 2024 and 17 October 2024 (with official registry numbers 30,513, 30,786, 30,877 and 30,930, respectively), the Company announces that the Company’s subsidiary OHL Operaciones, S.A.U. (the “Issuer”) has requested the approval of holders of its Split Coupon Senior Secured Notes due 2026 (ISIN: XS2356570239) / (ISIN: XS2356571120) (the “Notes” and the “Noteholders”) 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 2024 coupon under the Notes (the “Cash Interest Payment Waiver”) while the negotiations between the Company, certain noteholders (the “Ad Hoc Group”) and its other stakeholders towards entering into a lock-up agreement (the “Lock-up Agreement”) are ongoing, pursuant to the terms of a consent solicitation memorandum prepared by the Issuer dated 25 October 2024 (the “Consent Solicitation Memorandum”). The Cash Interest Payment Waiver requested under the Consent Solicitation Memorandum is until 15 November 2024. To the extent that the calculation agent receives accessions to the Lock-up Agreement from Noteholders holding at least 50 per cent. by value of the aggregate principal amount of outstanding Notes on or before 15 November 2024, the proviso to the Cash Interest Payment Waiver shall be that payment of such Cash Interest is made on or prior to the earliest of (a) the date on which all transactions and documents in connection with the recapitalisation transaction become effective or (b) 31 March 2025, unless the Lock-Up Agreement is terminated at any time, in which case the Cash Interest Payment Waiver shall cease to apply.

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 30 October 2024, unless it is extended, re-opened or terminated as provided in the Consent Solicitation Memorandum.

Madrid 25 October 2024.