Istanbulspor (Süper Lig): every transfer in and out, fees paid and earned, squad market value, €1.9m spent and €9.4m earned. Tracked squad: ACTUAL Value €2.5m vs €5m market value. Valued as of 2026-08-26.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-20 | Umut İslamoğlu | Gençlerbirliği Spor Kulübü | Istanbulspor | Free |
| 2026-08-08 | Muhammed Mert | Istanbulspor | Boluspor | Free |
| 2026-08-04 | Duhan Aksu | Istanbulspor | A. Keciörengücü | Free |
| 2026-08-04 | Yunus Bahadır | Istanbulspor | A. Keciörengücü | Free |
| 2026-07-31 | Cenk Sahin | Istanbulspor | Isparta Davrazspor | Free |
| 2026-07-18 | Alp Arda | Istanbulspor | Erbaaspor | Free |
| 2026-07-01 | Ilian Iliev | CSKA Sofia | Istanbulspor | Free |
| 2026-07-01 | Modestas Vorobjovas | Istanbulspor | Bnei Sakhnin | Free |
| 2026-02-05 | Florian Loshaj | Istanbulspor | Igdir FK | Free |
| 2026-02-03 | Muhammed Mert | Sarıyer SK | Istanbulspor | Free |
| 2026-01-30 | Emir Kaan Gültekin | Istanbulspor | Bursaspor | Free |
| 2025-09-12 | Emrecan Uzunhan | Besiktas | Istanbulspor | Loan |
| 2025-09-03 | Soner Salih Yavuz | Eyüpspor U19 | Istanbulspor | Free |
| 2025-09-03 | Muhlis Dağaşan | Jong PSV | Istanbulspor | Free |
| 2025-08-26 | Ş. Özcan | Istanbulspor | Serik Belediyespor | Free |
| 2025-08-26 | Player | Istanbulspor | Yalova Yeşilovaspor | Free |
| 2025-08-16 | Player | Istanbulspor | Pazarspor | Free |
| 2025-08-14 | Fahri Ay | Besiktas | Istanbulspor | Loan |
| 2025-08-04 | Player | Istanbulspor | Fatsa Belediyespor | Loan |
| 2025-08-02 | Okan Erdoğan | Istanbulspor | Sivasspor | Free |