Webuild

Share Issue/Capital Change • Jan 9, 2026

PRESS RELEASE

UPDATE TO ESSENTIAL INFORMATION OF SHAREHOLDERS' AGREEMENT BETWEEN SALINI S.P.A. AND CDP EQUITY S.P.A. PURSUANT TO ART. 131, PARAGRAPH 3, OF ISSUERS' REGULATION

MILAN, January 9, 2026 – Webuild S.p.A. informs that, as of today, an updated version of the Essential Information of the "Shareholders' Agreements concerning Webuild S.p.A. Ordinary Shares" (Pattuizioni parasociali relative ad azioni ordinarie Webuild S.p.A.), signed on February 29, 2024, between Salini S.p.A. and CDP Equity S.p.A., has been made available to the public on the Company's website (www.webuildgroup.com) in the "Governance/Other Documents" section, at the registered office, and via the authorised storage mechanism ().

This update, as required by Art. 131, Paragraph 3, of Consob Regulation no. 11971/1999 ("Issuers' Regulation"), reflects the changes that occurred during 2025—which were already communicated to the market—concerning the amount of shareholdings subject to the Agreement held by the said shareholders, and the relative voting rights.

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Webuild is a global leader in the construction of large, complex infrastructure projects, with a focus on sustainable mobility, hydropower, water treatment, and green buildings. A recognized leader in the water sector and active in about 50 countries, the Group employs approximately 95,000 people of over 125 nationalities. It boasts 120 years of experience with over 3,700 completed projects. Its track record includes 13,648 kilometres of railways, 891 kilometres of metro lines, 82,577 kilometres of roads and highways, 1,022 kilometres of bridges and viaducts, 3,462 kilometres of tunnels, and 319 dams and hydropower plants. Among its most iconic projects are the Grand Ethiopian Renaissance Dam in Ethiopia, the expansion of the Panama Canal, the Long Beach International Gateway bridge in California, the Second Bosphorus Bridge in Turkey, the Sydney Metro Northwest skytrain viaduct and bridge, the Kingdom Centre skyscraper in Riyadh, and metro lines in cities such as Copenhagen, Paris, Rome, Milan, Naples, Doha, Thessaloniki, and Riyadh. Ongoing projectsinclude the New Genoa Breakwater, the Brenner Base Tunnel, the Pedemontana Lombarda Highway, Metro di Roma's Line C, the Genoa-Milan and Naples-Bari high-speed/high-capacity railways, the Palermo-Catania-Messina high-capacity railway, the Snowy 2.0 hydropower scheme in Australia and the Dams System in Trojena in Saudi Arabia. As of December 31, 2024, the Group registered total revenues of €12 billion. As of June 30, 2025, its total order backlog stands at approximately €59 billion, with over 90% of its construction backlog related to projects linked to the United Nations Sustainable Development Goals. Listed on the Borsa Italiana stock exchange in Milan (WBD; WBD.MI; WBD:IM), it is member of the MIB ESG index of Italian companies with best ESG practices. Headquartered in Italy, it is subject to the management and coordination of Salini Costruttori S.p.A.

More information at www.webuildgroup.com

Contacts: Media Relations Investor Relations Francesca Romana Chiarano Amarilda Karaj Tel. +39 338 247 4827 Tel +39 06 6776 26975

email: f.chiarano@webuildgroup.com email: a.karaj@webuildgroup.com