La SIA S.p.A.

Board/Management Information • May 30, 2025

PRESS RELEASE

RESIGNATION OF DIRECTORS MARIO RAMPINI AND RICCARDO SACCONI CO-OPTED DIRECTORS VINCENZO GROSSO AND PAOLO ALTICHIERI

Rome, May 30, 2025 - La SIA S.p.A. ('La SIA' or the 'Company'), a company operating in the engineering & design sector, whose shares are traded on Euronext Growth Milan, announces that, today, Mare Engineering Group S.p.A. ("Mare Group") announced that it has finalized the acquisition of a total of no. 4,000.000 shares of the Company, representing approximately 70.6% of the relevant share capital, by CSE Holding S.r.l. (holding company of Maurizio Ciardi), Aspasia S.r.l. (holding company of Mario Rampini) and GLSR S.r.l. (holding company of Riccardo Sacconi) of which 17% in cash and 82% by share exchange (the "Acquisition").

As a result of the Acquisition, Mare Group holds a total of 4.000,000 shares representing 70.6% of the share capital of La SIA. It should be noted that, therefore, Mare Group will be required to promote a a mandatory takeover offer (the "Offer") on the remaining 29.4% of the shares of La SIA pursuant to Article 102 of Legislative Decree 58/1998, as amended (the "TUF") as well as the relevant implementing provisions contained in Consob Regulation on Issuers no. 11971/1999 as amended and supplemented (the "Issuers' Regulations"), and Articles 106(1) and 109(1) of the TUF made applicable by voluntary reference made in Article 12 of La SIA's bylaws, as per the notice circulated today pursuant to Article 102(1) of the TUF and Article 37 of the Issuers' Regulations. For more information on the Acquisition and the Offer, please refer to the press release published today by Mare Group on its website as well as the press release pursuant to Article 102 of the TUF also made available on the Company's website.

The Company announces that, in the context of the completion of the Acquisition, Director Mario Rampini and Director Riccardo Sacconi today resigned from their respective offices. To replace the resigning directors, the Board of Directors meeting today co-opted, pursuant to Article 2386 of the Civil Code, directors Vincenzo Grosso and Paolo Altichieri.

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A summary of the curricula vitae of Director Vincenzo Grosso and Director Paolo Altichieri will be made available for consultation on the Company's website.

All of the co-opted directors are found to meet the requirements of honorability set forth by law and other applicable provisions and will hold office until the next shareholders' meeting.

As of today's date, as far as the Company's knowledge, none of the directors appointed by the Board of Directors holds an interest in the share capital of La SIA.

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This press release is available on the Company's website https://lasia.it/investor-relations/, "Investor Relations/Press Releases" section.

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PRESS RELEASE

For the transmission of regulated information La SIA S.p.A. uses the dissemination system (SDIR) "" available at managed by Computershare S.p.A. with registered office in Via Lorenzo Mascheroni 19, Milan.

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Contacts

Investor Relator	Euronext Growth Advisor
Alessandra Speranza	illimity Bank S.p.A.
Viale Luigi Schiavonetti 286, 00173 Rome (RM)	Via Soperga 9, 20124 Milan
+39 0645441972	+39 0282849699
investorrelator@lasia.it	lasia@illimity.com
Specialist	Investor & Media Relations
MiT Sim S.p.A.	Twister Communications Group S.r.l.
Corso Venezia 16, 20121 Milan	Via Valparaiso, 3 - 20144 Milan

• 39 0230561270 +39 02438114200 investor.relations@mitsim.it Lucia Saluzzi lasia@twistergroup.it

The Company

La SIA S.p.A. is an innovative SME active in the engineering and design sector, specialising in the design of infrastructures in the fields of telecommunications, civil construction, mobility infrastructures and energy plants, using state-of-the-art technologies and specific know-how. La SIA is among the top 100 engineering companies in Italy, and among the first movers in the introduction of the BIM (Building Information Modeling) methodology, also used for safety, predictive maintenance and the protection of the country's artistic and historical heritage. The Company, established in 2004, operates through three business lines: the 'Civil & Design' line, specialising in the architectural, structural and plant design of complex buildings such as hospitals, data centres and stadiums, guaranteeing high quality and sustainability; the 'Utility & Infrastructure' line, focused on the management and design of infrastructures related to energy, road and rail networks, with particular attention to digital technologies and energy efficiency, and the design of medium voltage and photovoltaic systems; and finally the 'Telecommunications' line, entirely dedicated to the design and construction of fibre optic and mobile radio networks.