Turkcell (NYSE: TKC) seeks approval for Turkish debt issue

Rhea-AI Filing Summary

Turkcell İletişim Hizmetleri A.Ş. has applied to the Turkish Capital Markets Board for approval of a debt instrument issuance certificate for a domestic market offering, referring to an earlier announcement dated November 6, 2025.

The press release stresses that any related securities will not be registered under the U.S. Securities Act of 1933 and cannot be offered or sold in the United States or to U.S. persons without registration or an applicable exemption. The notice is issued in line with Rule 135c under the Securities Act.

Key Terms

Capital Markets Board, debt instrument issuance certificate, U.S. Securities Act of 1933, Regulation S, +1 more

5 terms

Capital Markets Board regulatory

"we made an application to the Capital Markets Board for the approval of a debt instrument issuance certificate"

debt instrument issuance certificate financial

"we made an application to the Capital Markets Board for the approval of a debt instrument issuance certificate"

U.S. Securities Act of 1933 regulatory

"The securities referred to herein have not been and will not be registered under the U.S. Securities Act of 1933, as amended"

Regulation S regulatory

"U.S. persons (as defined in Regulation S under the Securities Act)"

Regulation S is a set of rules that allows companies to sell securities (like shares or bonds) to investors outside the United States without having to follow all U.S. securities laws. It matters because it makes it easier for companies to raise money from international investors while still complying with U.S. regulations.

Rule 135c regulatory

"This press release is being issued pursuant to and in accordance with Rule 135c under the Securities Act"

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Accepted by SEC EDGAR 04/22/2026 - 12:23 PM Learn about SEC filing dates

FAQ

What did Turkcell (TKC) announce in its April 2026 Form 6-K?

Turkcell announced it applied to the Turkish Capital Markets Board for approval of a debt instrument issuance certificate in the domestic market. The filing references a prior company announcement dated November 6, 2025 about this potential debt issuance.

Does the Turkcell (TKC) announcement involve a debt issuance in the United States?

No, the announcement specifies the application concerns a debt instrument issuance in the Turkish domestic market. It also states the securities will not be registered under the U.S. Securities Act and cannot be offered or sold in the United States or to U.S. persons without an exemption.

Are Turkcell (TKC) securities mentioned in this release registered under the U.S. Securities Act?

The release states the securities have not been and will not be registered under the U.S. Securities Act of 1933. As a result, they may not be offered, sold, or delivered in the United States or to U.S. persons unless an applicable registration exemption is available.

What U.S. regulatory rule does the Turkcell (TKC) press release rely on?

The press release is issued pursuant to Rule 135c under the U.S. Securities Act of 1933. This rule allows certain limited public notices about proposed offerings outside the United States without those notices being treated as offers of securities.

Who can investors contact at Turkcell (TKC) for more information on the debt instrument application?

Investors are directed to Turkcell Investor Relations, reachable at investor.relations@turkcell.com.tr and by telephone at +90 212 313 1888. The contact details are provided specifically for questions regarding the debt instrument issuance application.

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 April 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 April 22, 2026 announcing the registrant's application to the Capital Markets Board for a debt instrument issuance in the domestic market.

Istanbul, April 22, 2026

Announcement Regarding the Application to the Capital Markets Board for a Debt Instrument Issuance in the Domestic Market

With reference to our Company’s announcement dated November 6, 2025, we made an application to the Capital Markets Board for the approval of a debt instrument issuance certificate.

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, U.S. 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.

1

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: April 22, 2026	By:	/s/ Özlem Yardım
		Name:	Özlem Yardım
		Title:	Investor Relations Corporate Finance Director

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
Date: April 22, 2026	By:	/s/ Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer