Rayo B: every transfer in and out, fees paid and earned, squad market value and €200k earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-07-01 | Etienne Eto'o | Rayo B | Rayo Vallecano | — |
| 2025-01-11 | Diego Méndez | Rayo B | Eldense | Loan |
| 2024-07-01 | Sergio Lozano | Rayo U19 | Rayo B | — |
| 2024-07-01 | Samu Becerra | Rayo U19 | Rayo B | — |
| 2024-07-01 | Mert Demirci | Rayo B | AD Alcorcón B | Free |
| 2024-07-01 | Marco de las Sías | Rayo U19 | Rayo B | — |
| 2024-07-01 | Etienne Eto'o | Unión Collado | Rayo B | Free |
| 2023-09-01 | Pablo Muñoz | Rayo B | Dep. La Coruña | €200k |
| 2023-08-30 | Mert Demirci | UD Almería B | Rayo B | Free |
| 2022-07-11 | Sergio Gimeno | Rayo B | UD Sanse | Free |
| 2022-07-01 | Pablo Muñoz | Rayo U19 | Rayo B | — |
| 2022-07-01 | Joselu Pérez | Rayo B | Valencia U19 | Free |
| 2021-09-01 | Joselu Pérez | Rayo U19 | Rayo B | — |
| 2021-07-07 | Kalvin Ketu | Rayo B | CyD Leonesa | Free |
| 2021-07-01 | Jorge Moreno | Rayo B | Rayo Vallecano | — |
| 2021-07-01 | Diego Méndez | Rayo U19 | Rayo B | — |
| 2020-09-21 | Kalvin Ketu | Rayo B | UP Langreo | Loan |
| 2020-08-01 | Ángel Algobia | Rayo B | Getafe CF B | Free |
| 2020-08-01 | Miguel Ángel Morro | Rayo B | Rayo Vallecano | — |
| 2020-08-01 | Martín Pascual | Rayo B | Rayo Vallecano | — |