Turkcell repays TRY 500M bond at maturity

The 93-day bond matured with a single coupon payment of TRY 51,277,500 and a TRY 500,000,000 principal payment.

Rhea-AI Filing Summary

Turkcell İletişim Hizmetleri A.Ş. (TKC) redeemed a bond with a nominal amount of TRY 500,000,000 on September 25, 2026, and made the coupon payment. The bond had a 93-day maturity and a fixed annual simple interest rate of 40.25%; its terms also list an annual compound interest rate of 46.6931%. The single coupon payment was TRY 51,277,500. JCR Avrasya Derecelendirme A.Ş. listed Turkcell’s long-term national rating as AAA (tr), marked investment grade, dated May 22, 2026.

Key Figures

Nominal principal: TRY 500,000,000 Coupon payment: TRY 51,277,500 Annual simple interest rate: 40.25% +3 more

6 metrics

Nominal principal TRY 500,000,000 Bond redeemed September 25, 2026

Coupon payment TRY 51,277,500 Single payment on September 25, 2026

Annual simple interest rate 40.25% Fixed-rate bond with a 93-day maturity

Annual compound interest rate 46.6931% Bond terms

Maturity 93 days Bond redeemed September 25, 2026

Periodic interest rate 10.2555% Single coupon payment

Key Terms

nominal amount, annual simple interest rate, Interest Rate - Yearly Compound (%), Sale To Qualified Investor

4 terms

nominal amount financial

"nominal amount of TRY 500,000,000"

Nominal amount is the face value or stated number attached to a financial instrument or obligation — for example the dollar value printed on a bond, loan, or share — without adjusting for inflation, market price changes, or other real-world factors. It matters to investors because the nominal amount determines contractual payments and headline figures, but may differ from the actual market value or purchasing power; think of it as a sticker price that can diverge from what you’d actually pay or receive.

annual simple interest rate financial

"annual simple interest rate of 40.25%"

Interest Rate - Yearly Compound (%) financial

"Interest Rate - Yearly Compound (%) | 46.6931%"

Sale To Qualified Investor regulatory

"Sale Type | Sale To Qualified Investor"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What was the principal amount of TKC’s redeemed bond?

Turkcell redeemed a bond with a nominal amount of TRY 500,000,000 on September 25, 2026.

How much coupon did TKC pay on the bond?

The single coupon payment was TRY 51,277,500 on September 25, 2026.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/25/2026 - 02:15 PM Accepted by SEC EDGAR 09/25/2026 - 02:14 PM Learn about SEC filing dates

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of September 2026

Commission File Number: 001-15092

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

34854 Maltepe
Istanbul, Türkiye

(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:

x Form 20-F  ¨ Form 40-F

Enclosure: A press release dated September 25, 2026 announcing the redemption of the registrant's Bond with ISIN Code TRFTCEL92628.

Istanbul, September 25, 2026

Announcement Regarding the Redemption of the Bond with ISIN Code TRFTCEL92628

Within the scope of our Company's announcement dated June 24, 2026, the redemption and coupon payment of the financing bond with ISIN code TRFTCEL92628 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).

Board Decision Date	: 06.11.2025
Related Issue Limit Info
Currency Unit	: TRY
Limit	: 15,000,000,000
Issue Limit Security Type	: Debt Securities
Sale Type	: Private Placement-Sale to Qualified Investor
Domestic / Oversea	: Domestic
Capital Market Board Approval Date	: 17.06.2026
Capital Market Instrument to be Issued Info
Type	: Bill
Maturity Date	: 25.09.2026
Maturity (Day)	: 93
Sale Type	: Sale To Qualified Investor
Intended Nominal Amount	: 500,000,000
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.
Starting Date of Sale	: 23.06.2026
Ending Date of Sale	: 24.06.2026
Nominal Value of Capital Market Instrument Sold	: 500,000,000
Maturity Starting Date	: 24.06.2026
Issue Price	: 1
Interest Rate Type	: Fixed
Interest Rate - Yearly Simple (%)	: 40.2500
Interest Rate - Yearly Compound (%)	: 46.6931
Traded in the Stock Exchange	: No
Payment Type	: TL Payment
ISIN Code	: TRFTCEL92628
Coupon Number	: 1
Currency Unit	: TRY
Coupon Payment Frequency	: Single Coupon

1

Redemption Plan of Capital Market Instrument Sold

Coupon Number	Payment Date	Record Date*	Payment Date	Interest Rate - Periodic (%)	Payment Amount	Exchange Rate	Was The Payment Made?
1	25.09.2026	24.09.2026	25.09.2026	10.2555	51,277,500
Principal/Maturity Date Payment Amount	25.09.2026	24.09.2026	25.09.2026		500,000,000

* The date on which the beneficiaries are determined.

Issuer Rating Note

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

For more information:

Turkcell Investor Relations

investor.relations@turkcell.com.tr

Tel: + 90 212 313 1888

2

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, Turkcell İletişim Hizmetleri A.Ş. has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
Date: September 25, 2026	By:	/s/ Özlem Yardım
		Name:	Özlem Yardım
		Title:	Investor Relations Corporate Finance Director

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
Date: September 25, 2026	By:	/s/ Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer