Southampton U18: every transfer in and out, fees paid and earned, squad market value, €1.8m spent and €1.7m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2024-07-20 | Alejandro Gomes Rodríguez | Southampton U18 | Olymp. Lyon B | — |
| 2024-07-01 | Jayden Moore | Southampton U18 | Southampton U21 | — |
| 2024-07-01 | Jay Robinson | Southampton U18 | Southampton U21 | — |
| 2023-07-01 | Tyler Dibling | Southampton U18 | Southampton U21 | — |
| 2023-07-01 | Samuel Amo-Ameyaw | Southampton U18 | Southampton | — |
| 2023-07-01 | Jayden Moore | Southampton Aca | Southampton U18 | — |
| 2023-07-01 | Jay Robinson | Southampton Aca | Southampton U18 | — |
| 2023-07-01 | Alejandro Gomes Rodríguez | Southampton Aca | Southampton U18 | — |
| 2022-09-01 | Tyler Dibling | Chelsea U18 | Southampton U18 | — |
| 2022-08-17 | Samuel Amo-Ameyaw | Tottenham Yth. | Southampton U18 | Free |
| 2022-07-29 | Tyler Dibling | Southampton U18 | Chelsea U18 | €1.7m |
| 2022-07-01 | Eddie Beach | Southampton U18 | Chelsea U21 | — |
| 2021-07-01 | Tyler Dibling | Southampton Aca | Southampton U18 | — |
| 2020-09-21 | Roland Idowu | Southampton U18 | Cardiff City U23 | Free |
| 2020-07-01 | Kazeem Olaigbe | Southampton U18 | Southampt. U23 | — |
| 2020-07-01 | Eddie Beach | Southampton Aca | Southampton U18 | — |
| 2020-07-01 | Alexandre Jankewitz | Southampton U18 | Southampt. U23 | — |
| 2019-07-20 | Kazeem Olaigbe | Anderlecht Yth. | Southampton U18 | — |
| 2019-07-01 | Will Ferry | Southampton U18 | Southampt. U23 | — |
| 2019-07-01 | Oludare Olufunwa | Southampton U18 | Southampt. U23 | — |