LB L. Brown | Out | 2026-08-23 | Loan | WU West Ham United U21 WES | BR Braintree BRA |
FP F. Potts | Out | 2026-08-03 | Transfer | WUWest Ham United U21 WES | CK Club Brugge KV CLU |
| FPF. Potts | In | 2026-08-02 | - | WH West Ham WES | WUWest Ham United U21 WES |
RO R. Oyebade | Out | 2026-07-02 | Loan | WUWest Ham United U21 WES | SO Southend SOU |
CB C. Brooks | In | 2026-06-30 | - | WU West Ham United U18 | WUWest Ham United U21 WES |
| CBC. Brooks | In | 2026-06-29 | - | WUWest Ham United U18 | WUWest Ham United U21 WES |
JL J. Landers | In | 2026-05-30 | Return from loan | BW Boreham Wood BOR | WUWest Ham United U21 WES |
JM J. Murphy | In | 2026-05-07 | - | CC Chelmsford City CHE | WUWest Ham United U21 WES |
| JMJ. Murphy | In | 2026-05-06 | - | CCChelmsford City CHE | WUWest Ham United U21 WES |
| JLJ. Landers | Out | 2026-03-25 | Loan | WUWest Ham United U21 WES | BWBoreham Wood BOR |
MA M. Antonio | Out | 2026-03-01 | Free agent | WUWest Ham United U21 WES | AL Al-Sailiya SAI |
EA Emeka Adeile | Out | 2026-02-01 | Transfer | WUWest Ham United U21 WES | UT Utrecht UTR |
| EAEmeka Adeile | Out | 2026-01-31 | Transfer | WUWest Ham United U21 WES | UTUtrecht UTR |
ES E. Sowunmi | Out | 2026-01-29 | - | WUWest Ham United U21 WES | TU Tottenham Hotspur U21 TOT |
| ESE. Sowunmi | Out | 2026-01-28 | - | WUWest Ham United U21 WES | TUTottenham Hotspur U21 TOT |
FH F. Herrick | Out | 2025-09-01 | Loan | WUWest Ham United U21 WES | BWBoreham Wood BOR |
DC D. Colau | In | 2025-08-31 | - | PF Paris FC PAR | WUWest Ham United U21 WES |
| MAM. Antonio | Out | 2025-08-22 | Free agent | WUWest Ham United U21 WES | ALAl-Sailiya SAI |
| MAM. Antonio | In | 2025-08-16 | - | WHWest Ham WES | WUWest Ham United U21 WES |
CL C. Leacock | In | 2025-07-02 | - | LI Linfield LIN | WUWest Ham United U21 WES |
BD B. Dolaghan | In | 2025-07-01 | Back from Loan | AT Aldershot Town ALD | WUWest Ham United U21 WES |
LU Luizão | In | 2025-07-01 | Back from Loan | PS Pogon Szczecin POG | WUWest Ham United U21 WES |
DC D. Cummings | In | 2025-06-30 | - | CE Celtic CEL | WUWest Ham United U21 WES |
RH R. Hargan | In | 2025-06-30 | Raise | WUWest Ham United U21 WES | WUWest Ham United U21 WES |
DA D. Abraham | Out | 2025-06-29 | Free agent | WUWest Ham United U21 WES | — |
GE G. Earthy | In | 2025-05-30 | Return from loan | BC Bristol City BRI | WUWest Ham United U21 WES |
| FPF. Potts | In | 2025-05-30 | Return from loan | PO Portsmouth POR | WUWest Ham United U21 WES |
FF F. Fawunmi | Out | 2025-02-07 | Free Transfer | WUWest Ham United U21 WES | SC Stoke City STO |
RC R. Clayton | Out | 2025-02-02 | Loan | WUWest Ham United U21 WES | DR Dagenham & Redbridge DAG |
HB Hugo Bauer | Out | 2025-01-30 | Transfer | WUWest Ham United U21 WES | AL Austria Lustenau LUS |
| JLJ. Landers | In | 2025-01-29 | - | HI Hibernian HIB | WUWest Ham United U21 WES |
LA L. Awesu | In | 2024-11-04 | Raise | WUWest Ham United U21 WES | WUWest Ham United U21 WES |
LA L. Awesu | In | 2024-11-04 | Raise | WUWest Ham United U21 WES | WUWest Ham United U21 WES |
KA K. Appiah-Forson | Out | 2024-08-30 | N/A | WUWest Ham United U21 WES | SOSouthend SOU |
| FPF. Potts | Out | 2024-08-25 | Loan | WUWest Ham United U21 WES | POPortsmouth POR |
GK G. Kodua | Out | 2024-08-23 | Loan | WUWest Ham United U21 WES | WY Wycombe WYC |
| GEG. Earthy | Out | 2024-08-13 | Loan | WUWest Ham United U21 WES | BCBristol City BRI |
| DAD. Abraham | In | 2024-08-13 | Return from loan | CR Concord Rangers CON | WUWest Ham United U21 WES |
| DAD. Abraham | Out | 2024-07-13 | Loan | WUWest Ham United U21 WES | CRConcord Rangers CON |
| LBL. Brown | In | 2024-07-04 | - | AR Arsenal ARS | WUWest Ham United U21 WES |
| FPF. Potts | In | 2024-05-30 | Return from loan | WYWycombe WYC | WUWest Ham United U21 WES |
| GKG. Kodua | In | 2024-05-02 | N/A | WYWycombe WYC | WUWest Ham United U21 WES |
| KAK. Appiah-Forson | In | 2024-04-25 | N/A | DRDagenham & Redbridge DAG | WUWest Ham United U21 WES |
SM S. Moore | In | 2023-08-01 | N/A | CF Cliftonville FC CLI | WUWest Ham United U21 WES |
BB B. Bates | In | 2023-08-01 | N/A | WUWest Ham United U18 | WUWest Ham United U21 WES |
| FPF. Potts | Out | 2023-07-27 | Loan | WUWest Ham United U21 WES | WYWycombe WYC |
MO M. Odubeko | Out | 2023-07-17 | Free | WUWest Ham United U21 WES | MA Marítimo |
TN Thierry Nevers | In | 2023-07-01 | N/A | BR Bradford BRA | WUWest Ham United U21 WES |
| MOM. Odubeko | In | 2023-07-01 | N/A | PV Port Vale POR | WUWest Ham United U21 WES |
| HBHugo Bauer | In | 2023-06-30 | - | — | WUWest Ham United U21 WES |
