Turkcell Board Approves $7M Capital Increase for BeST

The increase is scheduled in two installments, with equivalent foreign-currency payments permitted in October and December 2026.

Rhea-AI Filing Summary

Turkcell İletişim Hizmetleri A.Ş. (TKC) said its board resolved to increase the capital of its subsidiary CJSC Belarusian Telecommunications Network (BeST) by USD 7,000,000, or the equivalent amount in foreign currency. The first installment of USD 5,000,000 is scheduled for October 2026, followed by a second installment of USD 2,000,000 in December 2026, each payable in the equivalent amount in foreign currency.

Key Figures

Total capital increase: USD 7,000,000 First installment: USD 5,000,000 Second installment: USD 2,000,000

3 metrics

Total capital increase USD 7,000,000 Resolved increase for BeST, or the equivalent amount in foreign currency

First installment USD 5,000,000 Scheduled for October 2026, or the equivalent amount in foreign currency

Second installment USD 2,000,000 Scheduled for December 2026, or the equivalent amount in foreign currency

Key Terms

capital increase, installment, foreign private issuer

3 terms

capital increase financial

"the capital increase in BeST"

A capital increase is when a company raises new equity funding by issuing additional shares or otherwise expanding its ownership base. Investors watch these moves because they supply cash for growth, acquisitions or debt reduction, but they can also reduce each existing share’s ownership and claim on profits—like adding more slices to a pizza: the pie may grow, but each slice can become smaller unless overall value increases proportionally.

installment financial

"the first installment of USD 5,000,000"

foreign private issuer regulatory

"Report of Foreign Private Issuer"

A foreign private issuer is a company organized outside the United States that meets tests showing it is primarily foreign-controlled and therefore qualifies for a different set of U.S. reporting rules. For investors, that means the company files less frequent or differently formatted disclosures with U.S. regulators and may follow home-country accounting and governance practices, so buying its stock is like dining at a well-reviewed restaurant that follows its home kitchen’s rules instead of the local menu — you get access but should check what standards apply.

FAQ

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

How much is Turkcell increasing BeST's capital by?

Turkcell's board resolved to increase BeST's capital by USD 7,000,000, or the equivalent amount in foreign currency. The first installment is USD 5,000,000 in October 2026, and the second is USD 2,000,000 in December 2026.

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

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Available on EDGAR 09/24/2026 - 01:59 PM Accepted by SEC EDGAR 09/24/2026 - 01:58 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 24, 2026 announcing the registrant’s decision to increase the capital of BeST.

Istanbul, September 24, 2026

Announcement Regarding the Capital Increase in BeST

Our Company’s Board of Directors has resolved to increase the capital of our subsidiary CJSC Belarusian Telecommunications Network (“BeST”) by a total amount of USD 7,000,000 and/or the equivalent amount in foreign currency, with the first installment of USD 5,000,000 and/or the equivalent amount in foreign currency to be paid in October 2026 and the second installment of USD 2,000,000 and/or the equivalent amount in foreign currency to be paid in December 2026.

For more information:

Turkcell Investor Relations

investor.relations@turkcell.com.tr

Tel: + 90 212 313 1888

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 24, 2026	By:	/s/ Özlem Yardım
		Name:	Özlem Yardım
		Title:	Investor Relations Corporate Finance Director

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
Date: September 24, 2026	By:	/s/ Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer