Southampton U18 (Premier League U18): every transfer in and out, fees paid and earned, squad market value and €1.7m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-08-15 | Walter Nutter | Chelsea Yth | Southampton U18 | Free |
| 2025-08-09 | James Martin | Southampton U18 | AFC Totton | Free |
| 2025-07-26 | H. Rodda | Chelsea U18 | Southampton U18 | Free |
| 2025-07-01 | Luke Hawe | Ballymena United | Southampton U18 | Free |
| 2025-07-01 | Max Fry | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Nicholas Oyekunle | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Aston Daley | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Moses Sesay | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Barnaby Williams | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Sufianu Sillah Dibaga | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Player | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Thierry Rohart-Brown | Southampton U18 | Southampton U21 | Free |
| 2025-07-01 | Tommy Dobson-Ventura | Southampton U18 | Southampton U21 | Free |
| 2025-01-24 | Josh Pitts | Southampton U18 | Ipswich Town U21 | Free |
| 2024-07-20 | Alejandro Gomes Rodríguez | Southampton U18 | Olympique Lyonnais II | Free |
| 2024-07-09 | Joe Andrews | Southampton U18 | Chippenham Town | Free |
| 2024-07-01 | Leo Umeh | Chelsea Yth | Southampton U18 | Free |
| 2024-07-01 | Princewill Ehibhatiomhan | Southampton U18 | Southampton U21 | Free |
| 2024-07-01 | Player | Southampton U18 | Southampton U21 | Free |
| 2024-07-01 | Jay Robinson | Southampton U18 | Southampton U21 | Free |