Turkcell (NYSE:TKC, BIST: TCELL)) announced that it has filed its Annual Report on Form 20-F for the year ended December 31, 2025 with the United States Securities and Exchange Commission on April 17, 2026. The Company's Form 20-F and complete audited financial statements can be found at: https://www.turkcell.com.tr/en/aboutus/investor-relations/quarterly-results

Hard copy versions of the complete audited financial statements are available free of charge upon request from Turkcell Investor Relations Department at investor.relations@turkcell.com.tr and/or +90 212 313 1888.

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Turkcell Investor Relations

Ozlem Yardim

Tel: +90 212 313 1888

ozlem.yardim@turkcell.com.tr

or

Turkcell Corporate Communications

Burak Mergen

Tel: +90 212 313 2321

burak.mergen@turkcell.com.tr