Real Sociedad (Laliga): every transfer in and out, fees paid and earned, squad market value, €243m spent and €444m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Aritz Elustondo | Real Sociedad | Without Club | — |
| 2026-01-31 | Wesley | Al-Nassr | Real Sociedad | Loan |
| 2026-01-27 | Mikel Goti | Real Sociedad | Córdoba CF | Loan |
| 2026-01-08 | Umar Sadiq | Real Sociedad | Valencia | €5m |
| 2025-09-01 | Yangel Herrera | Girona | Real Sociedad | €11m |
| 2025-09-01 | Sheraldo Becker | Real Sociedad | CA Osasuna | Free |
| 2025-09-01 | Hamari Traoré | Real Sociedad | Paris FC | €4.5m |
| 2025-09-01 | Carlos Soler | PSG | Real Sociedad | €6m |
| 2025-08-31 | Javi López | Real Sociedad | Real Oviedo | Loan |
| 2025-08-28 | Urko González de Zárate | Real Sociedad | Espanyol | €5m |
| 2025-08-25 | Jon Pacheco | Real Sociedad | Alavés | Loan |
| 2025-08-04 | Gonçalo Guedes | Wolves | Real Sociedad | €4m |
| 2025-08-01 | Duje Caleta-Car | Lyon | Real Sociedad | Loan |
| 2025-07-16 | Jon Ander Olasagasti | Real Sociedad | Levante | €500k |
| 2025-07-06 | Martín Zubimendi | Real Sociedad | Arsenal | €70m |
| 2025-07-01 | Mikel Goti | Real Sociedad B | Real Sociedad | — |
| 2025-07-01 | Jon Magunazelaia | Real Sociedad | SD Eibar | Free |
| 2025-01-23 | Urko González de Zárate | Real Sociedad | Espanyol | Loan |
| 2025-01-04 | Umar Sadiq | Real Sociedad | Valencia | Loan |
| 2025-01-01 | Jon Magunazelaia | Real Sociedad | Córdoba CF | Loan |