Optima Bank S.A.

Transaction in Own Shares • Dec 23, 2025

ANNOUNCEMENT REGARDING THE PURCHASE OF OWN SHARES

Optima bank S.A. (hereinafter "Optima bank" or the "Bank"), following its announcement of 18 December 2025 with respect to the commencement of the Share Buyback Progamme (the "Programme") pursuant to:

• a) the decision of the Ordinary General Meeting of Shareholders held on 29.04.2025, which approved the establishment of a Share Buyback Programme in accordance with article 49 of Law 4548/2018 and the granting of the relevant authorizations to the Board of Directors, and
• (b) the relevant decision of the Board of Directors dated 18.12.2025,

hereby informs the public that during the period 19.12.2025 – 22.12.2025, the Bank purchased within the framework of the Programme, a total of 220,000 shares issued by the Bank ("Own Shares") and traded on the Athens Stock Exchange ("ATHEX") with an average purchase price of €7.55 per share and a total cost of €1,661,000.

In particular, the following purchases were made on the ATHEX through the Bank under its capacity as ATHEX member:

Date	Number of shares	Value of shares (€)	Average purchase price (€)	Highest price (€)	Lowest price (€)
19.12.2025	110,000	836,000,0	7.6	7.6	7.6
22.12.2025	110,000	825,000,0	7.5	7.5	7.5

Following the above purchases, Optima bank holds in total 220,000 Own Shares corresponding to 0,1% of its paidup share capital.

This announcement is issued in accordance with Regulation (EU) 596/2014 of the European Parliament and the Council of 16 April 2014 and the Commission Delegated Regulation (EU) 2016/1052 of 8 March 2016, as in force.

Maroussi, 23 December 2025

Optima bank S.A.

^• Registration Number of Hellenic Business Registry: 003664201000 • Tax Registration No: 099369013 • Athens Tax Office for Sociétés Anonymes • 32 Aigialeias & Paradissou Str. 15125 Maroussi Greece

^• Τ: +30 210 8173000 • F: +30 210 8173101 • E: hello@optimabank.gr