Kocaelispor (Süper Lig): every transfer in and out, fees paid and earned, squad market value, €4.1m spent and €1.9m earned. Tracked squad: ACTUAL Value €19m vs €30m market value. Valued as of 2026-08-15.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-23 | Matej Maglica | SV Darmstadt 98 | Kocaelispor | €400k |
| 2026-08-19 | Gonçalo Sousa | FC Porto | Kocaelispor | Loan |
| 2026-08-11 | Berkan Kutlu | Konyaspor | Kocaelispor | Free |
| 2026-08-07 | Metehan Altunbaş | Eyüpspor | Kocaelispor | Free |
| 2026-08-05 | Joseph Nonge | Kocaelispor | Dynamo Brest | Free |
| 2026-07-27 | Darko Churlinov | Kocaelispor | Pogon Szczecin | Free |
| 2026-07-21 | Mesut Can Tunalı | Kocaelispor | Adana 01 | Free |
| 2026-07-18 | Show | Maccabi Haifa | Kocaelispor | €500k |
| 2026-07-17 | Haydar Karataş | Sakaryaspor | Kocaelispor | Free |
| 2026-07-06 | Tanguy Zoukrou | BSC Young Boys | Kocaelispor | Loan |
| 2026-07-05 | Emir Ortakaya | Caykur Rizespor | Kocaelispor | Free |
| 2026-07-01 | Habib Keïta | Clermont Foot | Kocaelispor | €700k |
| 2026-07-01 | Uğur Kaan Yıldız | Göztepe | Kocaelispor | Free |
| 2026-07-01 | Makana Baku | APS Atromitos Athinon | Kocaelispor | Free |
| 2026-07-01 | Onurcan Piri | Kayserispor | Kocaelispor | Free |
| 2026-03-03 | Arda Özyar | Kocaelispor U19 | Kocaelispor | — |
| 2026-02-22 | Deniz Ceylan | Kocaelispor U19 | Kocaelispor | — |
| 2026-02-06 | Ege Bilim | Kocaelispor | Yalova Yeşilovaspor | Loan |
| 2026-01-31 | Mahamadou Susoho | Man City U21 | Kocaelispor | €400k |
| 2025-09-12 | Habib Keïta | Clermont Foot | Kocaelispor | Loan |