Turkcell Iletisim Hizmetleri A S

UNDER THE SECURITIES EXCHANGE ACT OF 1934

TURKCELL İLETİŞİM HİZMETLERİ A.Ş.

(Translation of registrant's name into English)

Turkcell Küçükyalı Plaza

Aydınevler Mahallesi, İsmet İnönü Caddesi, No:20

Küçükyalı B Blok Ofispark

(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F:

Enclosure: A press release dated September 25, 2026 announcing the redemption of the registrant's Bond with ISIN Code TRFTCEL92610.

Announcement Regarding the Redemption of the Bond with ISIN Code TRFTCEL92610

Within the scope of our Company's announcement dated June 24, 2026, the redemption and coupon payment of the financing bond with ISIN code TRFTCEL92610 with a nominal amount of TRY 500,000,000 a maturity of 93 days and an annual simple interest rate of 40.25% was made on September 25, 2026 (today).

Issue Limit Security Type : Debt Securities

Sale Type : Private Placement-Sale to Qualified Investor

Capital Market Board Approval Date : 17.06.2026

Capital Market Instrument to be Issued Info

The country where the issue takes place : Türkiye

Title Of Intermediary Brokerage House : AK YATIRIM MENKUL DEĞERLER A.Ş.

Central Securities Depository : Merkezi Kayıt Kuruluşu A.Ş.

Nominal Value of Capital Market Instrument Sold : 500,000,000

Interest Rate - Yearly Simple (%) : 40.2500

Interest Rate - Yearly Compound (%) : 46.6931

Coupon Payment Frequency : Single Coupon

Redemption Plan of Capital Market Instrument Sold

Coupon Number Payment Date Record Date* Payment Date Interest Rate -

* The date on which the beneficiaries are determined.

Rating Company Rating Note Rating Date Is it Investment Grade?

JCR AVRASYA DERECELENDİRME A.Ş. Long Term National Rating AAA (tr) 22.05.2026 Yes