Sestao River (Segunda Division RFEF: Group 2): every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-24 | Anton Efremov | Osasuna II | Sestao River | Free |
| 2026-07-20 | Josemi Castañeda | Terrassa | Sestao River | Free |
| 2026-07-08 | Carlos González Cabrera | Europa | Sestao River | Free |
| 2026-07-07 | Imanol Torre | Sestao River | Salamanca CF UDS | Free |
| 2026-07-04 | Aratz Barandiaran | Sestao River | Gernika Club | Free |
| 2026-07-01 | Adri Carrión | Real Ávila | Sestao River | Free |
| 2026-07-01 | Andoni Ugarte | UD Logroñés | Sestao River | Free |
| 2026-07-01 | Eneko Delgado | Union Estepona | Sestao River | Free |
| 2026-07-01 | Gonzalo Zorrilla | SD Amorebieta | Sestao River | Free |
| 2026-07-01 | Jorge García Salmón | Sestao River | Portugalete | Free |
| 2026-02-02 | Ander Castillo | Samano | Sestao River | Free |
| 2026-01-22 | Imanol Torre | Barakaldo | Sestao River | Free |
| 2025-09-30 | Alfred Planas | Sestao River | Gokulam | Free |
| 2025-08-15 | Adrián Gómez | Sestao River | Real Avilés | Free |
| 2025-08-07 | Player | Tarazona | Sestao River | Free |
| 2025-08-04 | Player | Real Unión Club | Sestao River | Free |
| 2025-07-21 | Relu | Sestao River | Teruel | Free |
| 2025-07-20 | Imanol Sarriegi | UD Logroñés | Sestao River | Free |
| 2025-07-16 | Jon Madrazo | UD Logroñés | Sestao River | Free |
| 2025-07-16 | Jorge García Salmón | Union Estepona | Sestao River | Free |