Castellón: every transfer in and out, fees paid and earned, squad market value, €525k spent and €3.5m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Juanjo Nieto | NK Celje | Castellón | Free |
| 2026-07-01 | Jozhua Vertrouwd | Castellón | Rayo Vallecano | €1.5m |
| 2026-01-26 | Nick Markanich | Castellón | Houston | Loan |
| 2025-08-31 | Mamadou Traoré | Castellón | CD Teruel | Loan |
| 2025-08-21 | Milos Jojic | Castellón | Sloga Doboj | Free |
| 2025-08-12 | Jozhua Vertrouwd | Castellón | Rayo Vallecano | Loan |
| 2025-07-01 | Jetro Willems | Castellón | NEC Nijmegen | Free |
| 2025-07-01 | Gonzalo Crettaz | Castellón | NEC Nijmegen | Free |
| 2025-01-31 | Brian Schwake | Castellón | Nashville | Free |
| 2025-01-15 | Milos Jojic | Riga | Castellón | Free |
| 2025-01-07 | Mamadou Traoré | Union SG | Castellón | Free |
| 2025-01-03 | Mats Seuntjens | Castellón | FC Groningen | Free |
| 2025-01-01 | Nick Markanich | Charleston | Castellón | €175k |
| 2024-08-11 | Nikita Iosifov | Castellón | NK Celje | Free |
| 2024-08-01 | Thomas van den Belt | Feyenoord | Castellón | Loan |
| 2024-07-25 | Jetro Willems | Heracles Almelo | Castellón | Free |
| 2024-07-15 | Mats Seuntjens | RKC Waalwijk | Castellón | Free |
| 2024-07-11 | Álex Calatrava | Atl. Madrid B | Castellón | Free |
| 2024-07-01 | Player | Castellón | BG Pathum United | Free |
| 2024-01-24 | Jeremy de León | Castellón | RM Castilla | — |