Turkcell backs TRY 8B capital increase at Turktell

Turkcell injects additional cash into wholly owned subsidiary Turktell through an TRY 8 billion capital increase.

Rhea-AI Filing Summary

Turkcell İletişim Hizmetleri A.Ş. (TKC) reports that its wholly owned subsidiary, Turktell Bilişim Servisleri A.Ş., has completed a capital increase. Turktell’s capital was increased by TRY 8,000,000,000 to a new total of TRY 45,220,306,252.

Turkcell states that its pre-emption rights in this capital increase were fully exercised and paid in cash, maintaining Turktell as a wholly owned subsidiary.

Key Figures

Turktell capital increase amount: TRY 8,000,000,000 Turktell capital after increase: TRY 45,220,306,252 Turktell ownership: 100% +1 more

4 metrics

Turktell capital increase amount TRY 8,000,000,000 Increase in Turktell Bilişim Servisleri A.Ş. capital as announced September 22, 2026

Turktell capital after increase TRY 45,220,306,252 Total capital of Turktell Bilişim Servisleri A.Ş. following the increase

Turktell ownership 100% Turktell Bilişim Servisleri A.Ş. described as a wholly owned subsidiary of Turkcell

Announcement date September 22, 2026 Date of announcement in Istanbul regarding Turktell’s capital increase

Key Terms

pre-emption rights, wholly-owned subsidiary, capital increase

3 terms

pre-emption rights financial

"Our Company’s pre-emption rights with respect to the capital increase is fully paid in cash"

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.

wholly-owned subsidiary financial

"The capital of our Company’s wholly-owned subsidiary, Turktell Bilişim Servisleri A.Ş."

A wholly-owned subsidiary is a company whose entire ownership is held by another company, called the parent, so the parent controls all shares, board appointments and major decisions. For investors this matters because the subsidiary’s profits, losses, assets and liabilities are treated as part of the parent’s financial picture, affecting valuation and risk exposure — imagine a parent owning a single storefront outright and consolidating its receipts and bills into the parent’s books.

capital increase financial

"Announcement Regarding Turktell Bilişim Servisleri A.Ş. Capital Increase"

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.

FAQ

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

What capital change did Turkcell (TKC) announce for its subsidiary Turktell?

Turkcell announced that Turktell Bilişim Servisleri A.Ş. completed a capital increase of TRY 8,000,000,000, bringing Turktell’s total capital to TRY 45,220,306,252.

Did Turkcell (TKC) participate in Turktell’s capital increase?

Yes. Turkcell stated that its pre-emption rights were fully exercised in the Turktell capital increase and that these rights were paid in cash.

What is Turktell’s ownership status within Turkcell (TKC)?

Turktell Bilişim Servisleri A.Ş. is described as a wholly owned subsidiary of Turkcell İletişim Hizmetleri A.Ş., and this status is maintained following the capital increase.

What is Turktell’s new capital after the increase announced by Turkcell (TKC)?

Following the capital increase, Turktell Bilişim Servisleri A.Ş. has a total capital of TRY 45,220,306,252.

When did Turkcell (TKC) announce the Turktell capital increase?

The announcement regarding Turktell Bilişim Servisleri A.Ş.’s capital increase is dated September 22, 2026 in Istanbul.

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

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Available on EDGAR 09/22/2026 - 12:23 PM Accepted by SEC EDGAR 09/22/2026 - 12:22 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 22, 2026 announcing the capital increase of the registrant’s subsidiary, Turktell Bilişim Servisleri A.Ş.

Istanbul, September 22, 2026

Announcement Regarding Turktell Bilişim Servisleri A.Ş. Capital Increase

The capital of our Company’s wholly-owned subsidiary, Turktell Bilişim Servisleri A.Ş. (“Turktell”), has been increased by TRY 8,000,000,000 to TRY 45,220,306,252. Our Company’s pre-emption rights with respect to the capital increase is fully paid in cash.

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

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