West Ham Yth.: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2023-08-23 | Amara Nallo | West Ham Yth. | Liverpool U18 | — |
| 2023-07-01 | Ezra Mayers | West Ham Yth. | West Ham U18 | — |
| 2023-07-01 | Emeka Adiele | West Ham Yth. | West Ham U18 | — |
| 2021-07-01 | Oliver Scarles | West Ham Yth. | West Ham U18 | — |
| 2021-07-01 | Lewis Orford | West Ham Yth. | West Ham U18 | — |
| 2021-07-01 | Kaelan Casey | West Ham Yth. | West Ham U18 | — |
| 2020-09-02 | Benicio Baker-Boaitey | West Ham Yth. | FC Porto U17 | — |
| 2020-07-01 | Jacob Knightbridge | West Ham Yth. | West Ham U18 | — |
| 2020-07-01 | Freddie Potts | West Ham Yth. | West Ham U18 | — |
| 2020-07-01 | Divin Mubama | West Ham Yth. | West Ham U18 | — |
| 2019-11-05 | Ayden Heaven | West Ham Yth. | Arsenal Youth | Free |
| 2019-07-01 | Ronnie Stutter | West Ham Yth. | Chelsea Youth | Free |
| 2019-07-01 | Kamarai Swyer | West Ham Yth. | West Ham U18 | — |
| 2019-07-01 | Amadou Diallo | West Ham Yth. | West Ham U18 | — |
| 2018-07-01 | Josh Wilson-Esbrand | West Ham Yth. | West Ham U18 | — |
| 2018-07-01 | Harrison Ashby | West Ham Yth. | West Ham U18 | — |
| 2018-07-01 | Dan Chesters | West Ham Yth. | West Ham U18 | — |
| 2017-07-01 | Oliver Scarles | Chelsea Youth | West Ham Yth. | Free |
| 2017-07-01 | Louie Watson | West Ham Yth. | West Ham U18 | — |
| 2017-07-01 | Kristijan Belic | West Ham Yth. | West Ham U18 | — |