Iren

Related Party Transaction • Aug 18, 2025

Notice of Filing of Information Document on a Related Party

Transaction of Greater Significance

Reggio Emilia, 18 august 2025 – Iren S.p.A. hereby announces that an update of the information document regarding a previous transaction with a related party, classified as of "major importance", is being made available to the public at the Company Headquarters and at Borsa Italiana S.p.A. The update, in particular, relates the signing of an agreement regarding the convention for the concession, through project financing, of the plant and energy requalification activity aimed at improving the efficiency of the properties of the city of Turin, including management and maintenance, currently in place between Iren Smart Solutions S.p.A. and the Municipality of Turin.

The document is also available on the website www.gruppoiren.it, under the path "Governance – Internal control, risk management, compliance – Related party transactions" as well as on the authorized storage mechanism Sdir Storage ().

1Gruppo Iren Immagini Area Investor Relations Iren Overview

Investor Relations Giulio Domma Tel. + 39 0521.248410 investor.relations@gruppoiren.it Media Relations Roberto Bergandi Tel. + 39 011.5549911 Cell. + 39 335.6327398 roberto.bergandi@gruppoiren.it Comin & Partners Marta Leggio marta.leggio@cominandpartners.com Tommaso Accomanno tommaso.accomanno@cominandpartners.com