SCHEDULE 13D/A

TURKCELL ILETISIM HIZMETLERI A S

Ordinary Shares, nominal value TRY 1.000 per share · CUSIP: 900111204

Event date: 2026-11-10

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• IMTIS Holdings S.a r.l.

  Shares: 435,600,000 · Class: 19.8%

• International Mobile Telecom Investment Stichting Administratiekantoor

  Shares: 435,600,000 · Class: 19.8%

• L1T UB Holdings S.a r.l.

  Shares: 435,600,000.00 · Class: 19.8%

• LPE MANAGEMENT LIMITED

  Shares: 435,600,000.00 · Class: 19.8%

• LPE MIDDLE EAST LIMITED

  Shares: 435,600,000.00 · Class: 19.8%

• L1TS (CYPRUS) LIMITED

  Shares: 435,600,000.00 · Class: 19.8%

• Letterone Investment Holdings S.A.Reported CIK 0001657739

  Shares: 435,600,000.00 · Class: 19.8%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.