MASTERPLAST Nyilvánosan Működő Részvénytársaság

Legal Proceedings Report • Jul 29, 2025

ANNOUNCEMENT

In compliance with its obligation to provide special notification on consolidated enterprises as set out in Act CXX of 2001 on the Capital Market and Decree No. 24/2008 (VIII. 15.) of the Minister of Finance, ALTEO Energiaszolgáltató Nyilvánosan Működő Részvénytársaság (registered office: H-1033 Budapest, Kórház utca 6-12; company registration number: Cg.01- 10-045985; hereinafter: "Company" or "ALTEO") hereby provides the following information:

As announced by ALTEO in its announcement dated March 14, 2018, the Company's consolidated subsidiary, Sinergy Energiakereskedő Korlátolt Felelősségű Társaság (registered office: H-1033 Budapest, Kórház utca 6-12, company registration number: Cg.01- 09-178667; hereinafter: "Sinergy"), which operates ALTEO Group's Virtual Power Plant, requested the Hungarian Intellectual Property Office (hereinafter: "HIPO") to establish that none of the six control procedures it uses to operate the ALTEO Virtual Power Plant infringes on the patent "Decentralized energy production system, control tool and procedure, controlling the energy production of the system" registered for VPP Magyarország Zártkörűen Működő Részvénytársaság (current registered office: H-1117 Budapest, Budafoki út 91-93; company registration number: Cg.01-10-048666), as patent holder, under number E031332. In 2023, the holder of the patent changed, with CHP Energia Befektetési és Vagyonkezelő Zártkörűen Működő Részvénytársaság (registered office: H-2040 Budaörs, Szabadság út 301, company registration number: 13-10-041945; hereinafter: "CHP") becoming the new patent holder. Accordingly, the so-called negative clearance procedures continued against CHP.

In 2023, HIPO upheld Sinergy's appeals in all six cases, and ruled that the solutions used by Sinergy did not infringe on the patent in question. CHP has requested legal remedy against the rulings. In the court proceedings seeking legal remedy, the decisions of HIPO were upheld by both the Budapest-Capital Regional Court as court of first instance in 2024 and then by the Budapest-Capital Regional Court of Appeal as court of second instance in 2025.

The final and binding decisions of the Court of Appeal established that the solutions applied by Sinergy do not infringe on CHP's patent in question.

Budapest, July 16, 2025

ALTEO Nyrt.