Turkcell (NYSE: TKC) selects PwC as 2026 auditor and sustainability assurer

Rhea-AI Filing Summary

Turkcell İletişim Hizmetleri A.Ş. announced that its Board of Directors has resolved to appoint PwC Bağımsız Denetim ve Serbest Muhasebeci Mali Müşavirlik Anonim Şirketi as the independent audit firm for the Company’s 2026 accounts and operations. The firm is also designated to perform the mandatory sustainability assurance audit of sustainability reports prepared under the Turkish Sustainability Reporting Standards. This appointment will be submitted for shareholder approval at the Ordinary General Assembly Meeting scheduled for May 7, 2026.

Key Terms

independent audit firm, Capital Markets Law, Turkish Sustainability Reporting Standards, Assurance Audit Standards, +1 more

5 terms

independent audit firm financial

"appoint PwC Bağımsız Denetim ... as the independent audit firm for the audit of our Company's accounts"

Capital Markets Law regulatory

"for the year 2026 in accordance with Capital Markets Law, the Turkish Commercial Code"

Turkish Sustainability Reporting Standards regulatory

"sustainability reports to be prepared in accordance with the Turkish Sustainability Reporting Standards"

Assurance Audit Standards regulatory

"pursuant to the Assurance Audit Standards published by the Public Oversight, Accounting and Auditing Standards Authority"

sustainability assurance audit financial

"and also for the mandatory sustainability assurance audit of the sustainability reports"

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FAQ

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

Turkcell announced that its Board resolved to appoint PwC Bağımsız Denetim as the independent audit firm for 2026. The mandate covers both the audit of accounts and operations and mandatory sustainability assurance in line with Turkish regulations.

Which audit firm will review Turkcell (TKC) accounts for 2026?

Turkcell’s Board plans to appoint PwC Bağımsız Denetim ve Serbest Muhasebeci Mali Müşavirlik Anonim Şirketi as its independent audit firm for 2026. The firm will audit the Company’s accounts and operations in accordance with Capital Markets Law and the Turkish Commercial Code.

What sustainability-related role will PwC have at Turkcell (TKC)?

PwC Bağımsız Denetim is designated to perform the mandatory sustainability assurance audit of Turkcell’s sustainability reports. These reports will be prepared under the Turkish Sustainability Reporting Standards and reviewed pursuant to Assurance Audit Standards issued by the Public Oversight Authority.

When will Turkcell (TKC) shareholders vote on the new audit firm?

Turkcell plans to submit the PwC audit appointment to shareholders at its Ordinary General Assembly Meeting on May 7, 2026. The Board’s resolution becomes effective only after shareholders provide approval at that meeting.

Under which laws will Turkcell’s 2026 audit be conducted?

The 2026 audit will be carried out in line with the Capital Markets Law, the Turkish Commercial Code, and related legislation. Sustainability assurance will follow Turkish Sustainability Reporting Standards and Assurance Audit Standards issued by the Public Oversight, Accounting and Auditing Standards Authority.

How can investors contact Turkcell (TKC) Investor Relations about this audit decision?

Investors can contact Turkcell Investor Relations via email at investor.relations@turkcell.com.tr or by telephone at +90 212 313 1888. The team can provide further details regarding the Board’s decision on the 2026 independent audit firm.

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 21, 2026 announcing the appointment of the registrant’s independent audit company.

Istanbul, April 21, 2026

Announcement Regarding Determination of Independent Audit Company

Our Company's Board of Directors has resolved to appoint PwC Bağımsız Denetim ve Serbest Muhasebeci Mali Müşavirlik Anonim Şirketi as the independent audit firm for the audit of our Company's accounts and operations for the year 2026 in accordance with Capital Markets Law, the Turkish Commercial Code, and related legislations, and also for the mandatory sustainability assurance audit of the sustainability reports to be prepared in accordance with the Turkish Sustainability Reporting Standards, pursuant to the Assurance Audit Standards published by the Public Oversight, Accounting and Auditing Standards Authority. This appointment will be submitted for the approval of our shareholders at the Ordinary General Assembly Meeting to be held on May 7, 2026.

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: April 21, 2026	By:	/s/ Özlem Yardım
		Name:	Özlem Yardım
		Title:	Investor Relations Corporate Finance Director

	TURKCELL İLETİŞİM HİZMETLERİ A.Ş.
Date: April 21, 2026	By:	/s/ Kamil Kalyon
		Name:	Kamil Kalyon
		Title:	Chief Financial Officer