Istanbulspor (Super Lig): every transfer in and out, fees paid and earned, squad market value, €1.7m spent and €8.9m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Modestas Vorobjovas | Istanbulspor | Without Club | — |
| 2025-09-12 | Emrecan Uzunhan | Besiktas | Istanbulspor | Loan |
| 2025-09-03 | Soner Salih Yavuz | Eyüpspor U19 | Istanbulspor | Free |
| 2025-08-14 | Fahri Ay | Besiktas | Istanbulspor | Loan |
| 2025-07-25 | Ali Şahin Yılmaz | Trabzonspor | Istanbulspor | Loan |
| 2025-07-22 | İzzet Erdal | Gaziantep FK | Istanbulspor | — |
| 2025-07-04 | Gaoussou Diarra | Istanbulspor | Feyenoord | €3.8m |
| 2025-02-07 | Michael Ologo | Istanbulspor | Velez | Loan |
| 2025-01-17 | Mario Krstovski | NK Domzale | Istanbulspor | Free |
| 2024-08-15 | Gaoussou Diarra | Beykoz Anadolu | Istanbulspor | Free |
| 2024-08-01 | Kerem Şen | Trabzonspor | Istanbulspor | Loan |
| 2024-07-30 | Simon Deli | Istanbulspor | Asteras Aktor | Free |
| 2024-07-19 | Eduart Rroca | Istanbulspor | Without Club | — |
| 2024-07-17 | Mehmet Yeşil | Istanbulspor | Amed SK | €500k |
| 2024-07-12 | Eslem Öztürk | Istanbulspor | 1461 Trabzon | — |
| 2024-07-01 | Alperen Çaylak | Istanbulspor | Without Club | — |
| 2024-04-01 | Emir Mustafa Vuruşaner | Istanbul U19 | Istanbulspor | — |
| 2024-04-01 | Baran Alp Vardar | Istanbul U19 | Istanbulspor | — |
| 2024-02-12 | Eren Arda Şan | Istanbul U19 | Istanbulspor | — |
| 2024-02-09 | Murat Eser | Adana Demir U19 | Istanbulspor | Loan |