Turkcell completes book building for TRY 500M bond

A single coupon payment is scheduled for the bond's January 8, 2027 maturity.

Rhea-AI Filing Summary

Turkcell İletişim Hizmetleri A.Ş. completed book building for a TRY 500,000,000 financing bond issuance to qualified investors in Türkiye through a private placement, without a public placement. The securities were scheduled to be transferred to investor accounts on October 9, 2026. The bond has a stated 91-day maturity, due January 8, 2027, and a fixed annual simple interest rate of 37.00%; the listed annual compound rate is 42.4638%. The sale period ran from October 7 through October 9, 2026. The issuance is within the company’s TRY 15,000,000,000 issuance limit, approved by the Capital Markets Board on June 17, 2026.

Filing Explained

Turkcell reports the full TRY 500 million bond amount sold, so the financing sale is complete; transfer to investor accounts was still scheduled for October 9, 2026, and is not confirmed as completed here.

Key Figures

Nominal amount sold: TRY 500,000,000 Issuance limit: TRY 15,000,000,000 Annual simple interest rate: 37.00% +4 more

7 metrics

Nominal amount sold TRY 500,000,000 Financing bond sold to qualified investors

Issuance limit TRY 15,000,000,000 Approved by the Capital Markets Board on June 17, 2026

Annual simple interest rate 37.00% Fixed rate

Annual compound interest rate 42.4638% Financing bond

Maturity 91 days Due January 8, 2027

Periodic interest rate 9.2247% Single coupon payment due January 8, 2027

Coupon payment frequency 1 coupon Single coupon

Key Terms

book building, private placement, qualified investors, nominal amount, +1 more

5 terms

book building financial

"the book building of the financing bond issuance ... was completed"

private placement financial

"Private Placement-Sale to Qualified Investor"

A private placement is a sale of securities directly to a selected group of investors, typically institutions or accredited investors, instead of through a public offering. It lets a company raise money faster and with fewer regulatory steps; for existing shareholders it matters because the newly issued shares, often sold at a discount, increase the share count and can dilute their ownership.

qualified investors financial

"to qualified investors within Türkiye"

Qualified investors are individuals or institutions that meet regulatory standards—such as a minimum income, net worth, or professional expertise—allowing them access to investment opportunities not open to the general public. Think of them as a financial "VIP" group: they can buy private deals, complex products, or early-stage securities that may offer higher returns but also carry greater risk and less public information, so their status matters because it changes what investments are available and what protections apply.

nominal amount financial

"with a 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.

single coupon financial

"Coupon Payment Frequency | Single Coupon"

FAQ

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

How much did TKC issue, and what are the bond's interest terms?

TKC completed book building for a TRY 500,000,000 financing bond issuance with a fixed annual simple interest rate of 37.00% and an annual compound rate of 42.4638%. It was privately placed with qualified investors in Türkiye, without a public placement.

When does TKC's bond mature, and how is the coupon paid?

The bond matures on January 8, 2027. The repayment schedule lists a single coupon payment on that date and a periodic interest rate of 9.2247%.

Which rating company and ratings are listed with TKC's bond details?

JCR Avrasya Derecelendirme A.Ş. is named alongside national ratings of (TR) J1+ Short Term and (TR) AAA Long Term, dated May 22, 2026. The investment-grade field is marked Yes.

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

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Available on EDGAR 10/09/2026 - 09:27 AM EDT Accepted by SEC EDGAR 10/09/2026 - 09:27 AM EDT 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 October 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 October 9, 2026 announcing the registrant's financing bond issuance.

Istanbul, October 9, 2026

Announcement Regarding the Financing Bond Issuance

Within the scope of the TRY 15,000,000,000 issuance limit approved by the Capital Markets Board, the book building of the financing bond issuance of our Company with a maturity date of January 8, 2027, an annual simple interest of 37.00% with a nominal amount of TRY 500,000,000 to qualified investors within Türkiye, without a public placement was completed, and the securities will be transferred to the investor accounts on October 9, 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	: 08.01.2027
Maturity (Day)	: 91
Sale Type	: Sale To Qualified Investor
Intended Nominal Amount	: 500,000,000
Intended Maximum Nominal Amount	: -
The country where the issue takes place	: Türkiye
Title Of Intermediary Brokerage House	:
Central Securities Depository	: Merkezi Kayıt Kuruluşu A.Ş.
Starting Date of Sale	: 07.10.2026
Ending Date of Sale	: 09.10.2026
Nominal Value of Capital Market Instrument Sold   : 500,000,000
Maturity Starting Date	: 09.10.2026
Issue Price	: 1
Interest Rate Type	: Fixed
Interest Rate - Yearly Simple (%)	: 37.0000
Interest Rate - Yearly Compound (%)	: 42.4638
Traded in the Stock Exchange	: No
Payment Type	: TL Payment
ISIN Code	: TRFTCEL12717
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	08.01.2027	07.01.2027	08.01.2027	9.2247
Principal/Maturity	08.01.2027	07.01.2027	08.01.2027

* The date on which the beneficiaries are determined.

Rating Company	Rating Note	Rating Date	Is it Investment Grade?
JCR AVRASYA DERECELENDİRME A.Ş.	(TR) J1+ Short Term (national) (TR) AAA Long Term (national)	22.05.2026	Yes

For more information:

Turkcell Investor Relations

investor.relations@turkcell.com.tr

Tel: + 90 212 313 1888

Disclaimer

This press release does not constitute an offer to sell, or a solicitation of offers to purchase or subscribe for securities in the United States or any other jurisdiction in which such offer or solicitation would be unlawful. The securities referred to herein have not been and will not be registered under the U.S. Securities Act of 1933, as amended (the "Securities Act"), and may not be offered, sold or delivered within the United States or to or for the benefit of, US persons (as defined in Regulation S under the Securities Act) absent registration or an applicable exemption from the registration requirements of the Securities Act. This press release is being issued pursuant to and in accordance with Rule 135c under the Securities Act.

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: October 9, 2026	By:	/s/ Özlem Yardım
		Name:	Özlem Yardım
		Title:	Investor Relations Corporate Finance Director

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
Date: October 9, 2026	By:	/s/ Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer