Castellón U19: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-07-01 | Eddiel Márquez | Quart de Valls | Castellón U19 | — |
| 2022-07-01 | Jeremy de León | Castellón U19 | Castellón | — |
| 2022-01-01 | Jeremy de León | IDA Valencia | Castellón U19 | — |
| 2021-01-01 | Jeremy Jorge | Real Madrid U18 | Castellón U19 | Loan |
| 2020-07-01 | Pau Ferrer | Castellón U19 | Real Madrid U18 | — |
| 2019-07-01 | Álvaro Martínez | Castellón U19 | Real Betis Yth. | — |
| 2019-07-01 | Pau Ferrer | Unknown | Castellón U19 | — |
| 2018-07-01 | Álvaro Martínez | Villarreal Yth. | Castellón U19 | — |
| 2012-07-01 | Pablo Fornals | Castellón U19 | Málaga U19 | — |