West Ham U21: every transfer in and out, fees paid and earned, squad market value, €3.5m spent and €5.5m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-02 | Emeka Adiele | West Ham U21 | Utrecht | €570k |
| 2025-10-27 | Mohamadou Kanté | West Ham U21 | West Ham | — |
| 2025-09-01 | Lewis Orford | West Ham U21 | Stevenage | Loan |
| 2025-07-28 | Patrick Kelly | West Ham U21 | Barnsley | — |
| 2025-07-01 | Kaelan Casey | West Ham U21 | West Ham | — |
| 2025-07-01 | Freddie Potts | West Ham U21 | West Ham | — |
| 2025-07-01 | Callum Marshall | West Ham U21 | West Ham | — |
| 2025-06-30 | Mohamadou Kanté | Paris FC | West Ham U21 | Free |
| 2025-01-01 | Oliver Scarles | West Ham U21 | West Ham | — |
| 2024-08-26 | Freddie Potts | West Ham U21 | Portsmouth | Loan |
| 2024-08-22 | Mohamadou Kanté | Paris FC | West Ham U21 | Loan |
| 2024-08-09 | Callum Marshall | West Ham U21 | Huddersfield | Loan |
| 2024-08-08 | Patrick Kelly | West Ham U21 | Doncaster | Loan |
| 2024-07-01 | Jacob Knightbridge | West Ham U21 | Oxford United | Free |
| 2024-07-01 | Ezra Mayers | West Ham U18 | West Ham U21 | — |
| 2024-07-01 | Emeka Adiele | West Ham U18 | West Ham U21 | — |
| 2024-07-01 | Dan Chesters | West Ham U21 | Salford | Free |
| 2024-02-01 | Dan Chesters | West Ham U21 | Salford | Loan |
| 2024-01-26 | Callum Marshall | West Ham U21 | West Brom | Loan |
| 2023-07-29 | Kamarai Swyer | West Ham U21 | Crawley Town | Loan |