Report 4/2026 - Receipt of notifications pursuant to Article 69 of the Act on Public Offering, Conditions Governing the Introduction of Financial Instruments to Organized Trading, and on Public Companies

Legal basis: Article 70 point 1 of the Act on Public Offering - acquisition or disposal of a significant package of shares

The Management Board of Mostostal Warszawa S.A. with its registered office in Warsaw ("Company"), in performance of the obligation under Article 70(1) of the Act of July 29, 2005, on Public Offering, Conditions Governing the Introduction of Financial Instruments to Organized Trading, and Public Companies ("Act on Public Offering"), informs that on February 10, 2026, it received notifications from Acciona S.A., Corporación Acciona Infraestructuras S.L., Acciona Construcción S.A. and Acciona Construcción Polonia S.L. submitted pursuant to Article 69 of the Act on Public Offering regarding the division by separation of Acciona Construcción S.A. by transferring part of the assets of Acciona Construcción S.A. (including shares of the Company) to a newly established company Acciona Construcción Polonia S.L.

The notifications are annexed to this report.