Webuild

Share Issue/Capital Change • Oct 7, 2025

PRESS RELEASE

NOTICE OF CHANGE IN SHARE CAPITAL

(pursuant to Art. 85-bis of the Regulations adopted by Consob Resolution No. 11971 dated 14th May 1999, as amended, and Art. 2.6.2, paragraph 1, letter a), of the Market Regulations both organised and managed by Borsa Italiana S.p.A.)

AND OF THE TOTAL AMOUNT OF VOTING RIGHTS

(pursuant to art. 127-quinquies of Legislative Decree 58/1998 and art. 85-bis, paragraph 4-bis, of the CONSOB Issuers' Regulation)

Milan, October 7, 2025 - Webuild S.p.A. hereby announces the new composition of the share capital (fully subscribed and paid-up) and the total amount of voting rights, as of September 30, 2025, following:

• (i) the issue, in relation to the resolutions adopted by the Extraordinary Meeting of WEBUILD S.p.A. of April 30, 2021, of a total of 28,545 Webuild ordinary shares, as a result of the partial exercise of the 2021-2030 Webuild S.p.A. Warrants ("Anti-Dilution Warrants");
• (ii) the cancellation of the increased voting rights relating to a total of 604,886 Webuild ordinary shares.

Indeed, following the issue sub (i), the share capital is still equal to 600,000,000 Euros, currently divided into 1,019,296,984 shares without express nominal value, of which 1,017,681,493 are ordinary shares and 1,615,491 are savings shares.

The updated Articles of Association, pursuant to the foregoing, alongside the certificate pursuant to Art. 2444 of the Italian Civil Code were filed today with the Milan - Monza Brianza - Lodi Business and Trade Registry.

The current composition of the share capital and the total amount of voting rights is shown below, highlighting the changes compared to the previous share capital.

	CURRENT SHARE CAPITAL			PREVIOUS SHARE CAPITAL
	Euro	No. of shares	No. of votes	Euro	No. of shares	No. of votes
TOTAL	600,000,000	1,019,296,984	1,570,934,070	600,000,000	1,019,268,439	1,571,510,411
of which ordinary shares with one vote ISIN: IT0003865570 (regular enjoyment: 01/01/2025) Number of ongoing coupons: 16 Without nominal value	598,201,205.28	464,428,916	464,428,916	598,201,205.28	463,795,485	463,795,485
of which ordinary shares with increased vote ISIN: IT0005491763 (regular enjoyment: 01/01/2025) Number of ongoing coupons: 16 Without nominal value		553,252,577	1,106,505,154		553,857,463	1,107,714,926
of which Savings shares (regular enjoyment: 01/01/2025) Number of ongoing coupons: 19 Without nominal value	1,798,794.72	1,615,491	-	1,798,794.72	1,615,491	-

***

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 nearly 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 (USA), the Second Bosphorus Bridge (Turkey), the Sydney Metro Northwest skytrain viaduct and bridge (Australia), the Kingdom Centre skyscraper in Riyadh (Saudi Arabia), and metro lines in cities such as Copenhagen, Paris, Rome, Milan, Naples, Doha, Thessaloniki, and Riyadh. Ongoing projects include 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 hydropowerscheme in Australian and the Dams System in Trojena in the Kingdom of Saudi Arabia. As of December 31, 2024, the Group registered total revenues for €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 (SDGs). 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 02 444 22476

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