Turkiye Garanti Bankasi A.S.: Prospectus – Capital Markets Instrument Note

TO: Investment Community

FROM : Garanti BBVA / Investor Relations

SUBJECT:Prospectus – Capital Markets Instrument Note

DATE: September 18, 2026

Regarding the resolution that has been adopted by Garanti Bank on Sep 03, 2026 theapplication to issue “Garanti Bank Investment Institution Warrants”, up to the aggregate amount of 15,000,000,000in the nominal value ofTRY 0,1for each and 150,000,000 Turkish Lira (One hundred and fifty million Turkish Lira) was made to the Capital Markets Board.

Accordingly, the “Draft Capital Markets Instrument Note”, which has been submitted for the approval of the Capital Markets Board, regarding the issuance of Investment Institution Warrants up to the aggregate amount of TL 150,000,000 within 1-year period, is enclosed herewith.

*In contradiction between the Turkish and English versions of this public disclosure, the Turkish version shall prevail.

We declare that our above statements are in conformity with the principles included in the Board’s Communiqué, Serial II Nr.15.1, that it exactly reflects the information we received; that the information complies with our records, books and documents; that we did our best to obtain the correct and complete information relative to this subject and that we are responsible for the declarations made in this regard.

Yours sincerely,

Garanti BBVA

Contact Garanti BBVA Investor Relations:

Tel: +90 212 318 2352

Fax: +90 212 216 5902

E-mail: investorrelations@garantibbva.com.tr

www.garantibbvainvestorrelations.com