West Ham United (Premier League): every transfer in and out, fees paid and earned, squad market value, €1149m spent and €571m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Lukasz Fabianski | West Ham | Without Club | — |
| 2026-07-01 | Adama Traoré | West Ham | Without Club | — |
| 2026-02-02 | Axel Disasi | Chelsea | West Ham | Loan |
| 2026-01-28 | Lucas Paquetá | West Ham | Flamengo | €42m |
| 2026-01-28 | James Ward-Prowse | West Ham | Burnley | Loan |
| 2026-01-28 | Adama Traoré | Fulham | West Ham | €2.3m |
| 2026-01-26 | Guido Rodríguez | West Ham | Valencia | Free |
| 2026-01-22 | Keiber Lamadrid | Dep. La Guaira | West Ham | Loan |
| 2026-01-18 | Andrew Irving | West Ham | Sparta Prague | €1.5m |
| 2026-01-16 | Kaelan Casey | West Ham | Leyton Orient | Loan |
| 2026-01-07 | Callum Marshall | West Ham | VfL Bochum | Loan |
| 2026-01-05 | Taty Castellanos | Lazio | West Ham | €29m |
| 2026-01-04 | Luís Guilherme | West Ham | Sporting | €14m |
| 2026-01-02 | Pablo | Gil Vicente | West Ham | €23m |
| 2026-01-02 | Niclas Füllkrug | West Ham | AC Milan | Loan |
| 2025-10-27 | Mohamadou Kanté | West Ham U21 | West Ham | — |
| 2025-09-09 | Wes Foderingham | West Ham | Aris Limassol | Free |
| 2025-09-01 | Nayef Aguerd | West Ham | Marseille | €23m |
| 2025-09-01 | Maxwel Cornet | West Ham | Genoa | Loan |
| 2025-09-01 | Igor Julio | Brighton | West Ham | Loan |