Additions
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 01/2019 |  | Jon Ander | GK | |||
| 01/2019 | | Markel Lozano | MF |  | Arenas de Getxo | Arenas de Getxo |
| 01/2019 | | Oier Luengo | DF |  | Athletic Club B | Bilbao B |
| 01/2019 | | Soberón | FW |  | Racing Santander | Racing |
| 01/2019 | | Mikel Goiria | GK | |||
| 01/2019 | | Micaló | DF | |||
| 09/2018 | | Iker Bilbao | MF | |||
| 08/2018 | | Andoni Tascón | FW | | Athletic Club B | Bilbao B |
| 08/2018 | | Aurtenetxe | DF |  | Dundee FC | Dundee FC |
| 08/2018 | | Arregi | DF |  | Racing Ferrol | Racing Ferrol |
| 07/2018 | | Joseba Orbegozo | DF | |||
| 07/2018 | | Josu Ibarbia | DF |  | UD Melilla | UD Melilla |
| 07/2018 | | Mikel Zarrabeitia | DF |  | SD Zamudio | SD Zamudio |
| 07/2018 | | Murgoitio | DF |  | SD Gernika | Gernika |
| 07/2018 | | Chechu Meneses | MF |  | Peña Deportiva | Peña |
| 07/2018 | | Íñigo Del Olmo | MF | |||
| 07/2018 | | Izaro Abella | MF |  | SD Leioa | Leioa |
| 07/2018 | | Mikel Martins | MF |  | Real Unión | Real Unión |
| 07/2018 | | Ander Pacheco | FW | |||
| 07/2018 | | Íñigo Orozco | FW | |||
| 07/2018 | | Oli | FW | | Athletic Club B | Bilbao B |
| 07/2018 | | Iñigo Vélez | MA |
Departures
| from | Name | Pos | Team | Team | ||
|---|---|---|---|---|---|---|
| 02/2019 | | Chechu Meneses | MF |  | SD Compostela | SD Compostela |
| 01/2019 | | Magunagoitia | GK |  | CD Vitoria | CD Vitoria |
| 01/2019 | | Oli | FW |  | CD Barco | CD Barco |
| 07/2018 | | Nacho Zabal | GK |  | CD Calahorra | CD Calahorra |
| 07/2018 | | Jon Agirrezabala | DF |  | Barakaldo CF | Barakaldo CF |
| 07/2018 | | Juaristi | DF |  | CD Teruel | CD Teruel |
| 07/2018 | | Morgado | DF | | CD Calahorra | CD Calahorra |
| 07/2018 | | Oier Luengo | DF | | Athletic Club B | Bilbao B |
| 07/2018 |  | Sebastián Setti | MF | | SD Zamudio | SD Zamudio |
| 07/2018 | | Iván Arana | FW |  | Haro Deportivo | Haro Deportivo |
| 07/2018 | | Jon Ander | FW | | Racing Santander | Racing |
| 07/2018 | | Ubis | FW | | CD Calahorra | CD Calahorra |