MASTERPLAST Nyilvánosan Működő Részvénytársaság

Transaction in Own Shares • May 22, 2025

ANNOUNCEMENT

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

Information on own share transaction

The Company hereby informs investors that ALTEO has today executed own share transactions related to the implementation of the 2025 ESOP Spark ("Szikra"), Watt and Senior Management Remuneration Policies (hereinafter collectively: "Remuneration Policies") launched under the Employee Share Ownership Program (hereinafter: "ESOP"). The objective of the Remuneration Policies is to provide a long-term incentive and retention scheme for ALTEO's high performing middle managers, key employees and senior executives, and to strengthen their ownership mindset, thereby reinforcing the organization's result-oriented approach and its operation driven by shareholder value creation.

The remuneration condition set out in the Remuneration Policies has been fulfilled, which fact has been established and confirmed by the management of the ALTEO Employee Share Ownership Program Organization (hereinafter: "ALTEO ESOP Organization") on May 9, 2025, following prior approval by the ALTEO Audit Committee. Having fulfilled the remuneration condition, participating employees may receive remuneration in accordance with the provisions of Act XLIV of 1992 on the Employee Share Ownership Program, in the manner set out in the Remuneration Policies and the Articles of Association of the ALTEO ESOP Organization (hereinafter: "Articles of Association").

In view of the fulfilment of the remuneration condition, pursuant to Section 9.1 of the Remuneration Policies and Section 7.4 of the Articles of Association, the ALTEO ESOP Organization commences the conversion of the shares held in respect of the participating employees' membership stakes into cash.

Pursuant to Section 7.4 of the Articles of Association, the shares are converted into cash by way of their overthe-counter sale by the ESOP Organization to ALTEO, as founder. The relevant share purchase contract between ALTEO, as buyer, and the ALTEO ESOP Organization, as seller, was signed today for a total of 211,060 ALTEO ordinary shares (ISIN code: HU0000155726) at a price of HUF 5,735.41 per share.

Under the Remuneration Policies, the membership stakes of participating employees who were excluded from the scope of the Remuneration Policies – in particular due to termination or discontinuation of employment – or whose number of shares associated with their membership stakes decreased due to the application of an adjustment, were transferred to ALTEO. Pursuant to the Remuneration Policies, a total of 59,137 ALTEO ordinary shares (ISIN code: HU0000155726) are attached to the previously not involved membership stakes thus transferred to ALTEO. These shares were sold on identical terms at the same time.

ALTEO has not engaged an investment service provider for the transactions.

Following the completion of the transactions, ALTEO will own a total of 586,252 ALTEO ordinary shares (ISIN code: HU0000155726), taking into account the 316,055 ALTEO ordinary shares already held by it.

¹ In line with Section 9.2 of the Remuneration Policies, the purchase price of the shares is equal to the arithmetic average of the daily average price of the shares on the Budapest Stock Exchange, weighted by turnover, for the 30 trading days preceding the sale.

Information on the adoption of new ESOP remuneration policies

The Company has a continued interest in enhancing the performance and loyalty of its employees by having them share in the Company's success, one of the means of which is remuneration through the ESOP.

This year, the Company has continued this practice and, following the expiry this year of the 2025 Remuneration Policy and the Remuneration Policies described above, has adopted the 2027 ESOP General Remuneration Policy as well as the 2027 ESOP Spark ("Szikra"), Watt and Senior Management Remuneration Policies. Similarly to the 2025 ESOP, the 2027 ESOP General Remuneration Policy provides benefits to a wider range of employees provided that the specified remuneration conditions are met, while the 2027 ESOP Spark ("Szikra"), Watt and Senior Management Remuneration Policies are designed to incentivize the Company's middle managers, key employees and senior executives (CEO and Deputy CEOs).

The amount of shares needed to launch the 2027 General ESOP and the 2027 Spark ("Szikra"), Watt and Senior Management ESOPs will be made available to the ALTEO ESOP Organization by the Company by May 31, 2025. When this happens, the Company's portfolio of own shares will consist of a total of 250,618 ALTEO ordinary shares (ISIN code: HU0000155726).

Budapest, May 20, 2025

ALTEO Nyrt.

Disclaimer: All information contained within this article is for information purposes only, and shall notbe considered an official translation of the official communication referred to herein. This document does not include the integral wording of the official communication referred to herein, the original Hungarian language version of it remains to be the solely legally binding material in the subject matter.For further information, please do not hesitate to contact us.