Real Sociedad B: every transfer in and out, fees paid and earned, squad market value, €7.2m spent and €1.4m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-07-01 | Mikel Goti | Real Sociedad B | Real Sociedad | — |
| 2024-08-23 | Jonathan Gómez | Real Sociedad B | PAOK | €600k |
| 2024-07-10 | Bryan Fiabema | Real Sociedad B | Lech Poznan | Free |
| 2024-07-03 | Gaizka Ayesa | Real Sociedad B | Alcorcón | Free |
| 2024-07-01 | Pablo Marín | Real Sociedad B | Real Sociedad | — |
| 2024-07-01 | Jon Martín | Real Sociedad B | Real Sociedad | — |
| 2024-07-01 | Jon Magunazelaia | Real Sociedad B | Real Sociedad | — |
| 2024-07-01 | Jon Gorrotxategi | Real Sociedad B | Real Sociedad | — |
| 2024-07-01 | Jon Aramburu | Real Sociedad B | Real Sociedad | — |
| 2024-07-01 | Dani Díaz | R. Sociedad U19 | Real Sociedad B | — |
| 2024-07-01 | Arkaitz Mariezkurrena | Real Sociedad C | Real Sociedad B | — |
| 2024-07-01 | Alex Marchal | R. Sociedad U19 | Real Sociedad B | — |
| 2024-07-01 | Aitor Fraga | Real Sociedad C | Real Sociedad B | — |
| 2023-08-11 | Jonathan Gómez | Real Sociedad B | CD Mirandés | Loan |
| 2023-08-11 | Bryan Fiabema | Chelsea U21 | Real Sociedad B | Free |
| 2023-08-01 | Jon Aramburu | Real Unión | Real Sociedad B | — |
| 2023-07-05 | Javi Martón | Real Sociedad B | Athletic | Free |
| 2023-07-04 | Egoitz Arana | Real Sociedad B | San Fernando CD | Loan |
| 2023-07-01 | Urko González de Zárate | Real Sociedad B | Real Sociedad | — |
| 2023-07-01 | Unai Marrero | Real Sociedad B | Real Sociedad | — |