Turkcell boosts capital at Belarus unit BeST

Turkcell İletişim Hizmetleri A.Ş. reported a capital increase at its Belarusian subsidiary, CJSC Belarusian Telecommunications Network (BeST).

Accepted by SEC EDGAR 06/18/2026 - 04:38 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Turkcell İletişim Hizmetleri A.Ş. reported a capital increase at its Belarusian subsidiary, CJSC Belarusian Telecommunications Network (BeST). BeST’s share capital was raised by BYN 10,876,568.78, from BYN 1,363,865,668.50 to BYN 1,374,742,237.28. Turkcell’s pre-emption rights in this capital increase were fully paid, meaning it maintained its participation in the subsidiary’s equity.

Key Figures

BeST capital increase: BYN 10,876,568.78 BeST capital before increase: BYN 1,363,865,668.50 BeST capital after increase: BYN 1,374,742,237.28

3 metrics

BeST capital increase BYN 10,876,568.78 Incremental increase in BeST’s share capital

BeST capital before increase BYN 1,363,865,668.50 Share capital prior to the June 2026 increase

BeST capital after increase BYN 1,374,742,237.28 Share capital following the increase

Key Terms

capital increase, pre-emption rights, subsidiary

3 terms

capital increase financial

"announcing the capital increase in the registrant's subsidiary, CJSC Belarusian Telecommunications Network."

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.

pre-emption rights financial

"Our Company's pre-emption rights with respect to the capital increase have been fully paid."

A shareholder’s right to be offered new shares before they are sold to outsiders, allowing existing owners to buy enough to keep their ownership percentage. Think of it like being offered the first slice of a pie so your share doesn’t shrink; it matters to investors because it protects voting power and economic value from being diluted when a company issues more stock, and it can affect how easy or costly fundraising is.

subsidiary financial

"The capital of our Company's subsidiary, CJSC Belarusian Telecommunications Network ("BeST"), has been increased"

A subsidiary is a company that is controlled or owned by a larger company, known as the parent company. Think of it like a branch or division of a bigger organization; it operates separately but is ultimately guided by the parent. For investors, understanding subsidiaries helps clarify how a larger company is structured and where its resources and risks are concentrated.

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

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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 June 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 June 18, 2026 announcing the capital increase in the registrant's subsidiary, CJSC Belarusian Telecommunications Network.

Istanbul, June 18, 2026

Announcement Regarding the Capital Increase in BeST

The capital of our Company's subsidiary, CJSC Belarusian Telecommunications Network ("BeST"), has been increased by BYN 10,876,568.78 from BYN 1,363,865,668.50 to BYN 1,374,742,237.28. Our Company's pre-emption rights with respect to the capital increase have been fully paid.

For more information:

Turkcell Investor Relations

investor.relations@turkcell.com.tr

Tel: + 90 212 313 1888

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: June 18, 2026	By:	/s/ Özlem Yardım
		Name:	Özlem Yardım
		Title:	Investor Relations Corporate Finance Director

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
Date: June 18, 2026	By:	/s/ Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer