İNDEKS BİLGİSAYAR SİSTEMLERİ MÜHENDİSLİK SANAYİ VE TİCARET A.Ş. Özel Durum Açıklaması (Genel) 9 Haziran 2026

Board of Directors Resolution

Our Board of Directors has convened at the company headquarters and resolved as follows:

Pursuant to Article 13(4) of the Capital Markets Law No. 6362, restitution and payment are made by the Investor Compensation Center ("ICC") to the rightful owners in respect of our Company's shares, the ownership of which was transferred to the ICC due to the failure to dematerialize such shares within the prescribed period, in accordance with the provisions of the Regulation on the Procedures and Principles Regarding Payments to Investors by the Investor Compensation Center Following the Partial Annulment of Article 13(4) of the Capital Markets Law No. 6362, published in the Official Gazette dated 7 September 2016 and numbered 29824.

Under Article 5 of the aforementioned Regulation, the deadline for beneficiaries to apply to the Investor Compensation Center together with the required documentation is 6 September 2026.

Applications must be submitted to the Investor Compensation Center no later than 6 September 2026 following the delivery of the physical share certificates to our Company against a written receipt. Applicants are required to submit the delivery record issued upon such delivery, together with the other documents required under the Regulation (including an application petition, a copy of an identification document ).

Accordingly, beneficiaries wishing to benefit from the provisions of the Regulation are advised to complete their applications within the prescribed period in order to avoid any potential loss of rights.

Detailed information regarding the application process may be obtained from the "Frequently Asked Questions on Dematerialization" section available on the Investor Compensation Center's website (www.ytm.gov.tr) or by calling +90 (312) 292 90 45.

We hereby inform the public of these details.

This statement was translated into English for informational purposes. In case of a discrepancy between the Turkish and the English versions of this disclosure statement, the Turkish version shall prevail.