Willem II U21: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-07-20 | Myles Veldman | Willem II U21 | Nevėžis | Free |
| 2025-07-01 | Karst de Leeuw | Willem II U21 | Willem II | — |
| 2024-07-01 | Myles Veldman | SC Cambuur U21 | Willem II U21 | Free |
| 2023-10-24 | Maarten Schut | Willem II U21 | Willem II | — |
| 2023-10-24 | Khaled Razak | Willem II U21 | Willem II | — |
| 2023-07-01 | Karst de Leeuw | Willem II U18 | Willem II U21 | — |
| 2023-01-01 | Amine Lachkar | Willem II U21 | Willem II | — |
| 2022-07-23 | Dani Mathieu | Willem II U21 | Willem II | — |
| 2022-07-01 | Khaled Razak | Willem II U18 | Willem II U21 | — |
| 2021-07-16 | Jasper Dahlhaus | Willem II U21 | FC Eindhoven | Free |
| 2021-07-01 | Maarten Schut | Willem II U18 | Willem II U21 | — |
| 2021-07-01 | Amine Lachkar | Wooter Aca. | Willem II U21 | Free |
| 2021-02-01 | Jasper Dahlhaus | Willem II U21 | FC Eindhoven | Loan |
| 2020-07-01 | Jasper Dahlhaus | Vitesse U19 | Willem II U21 | Free |
| 2020-07-01 | Dani Mathieu | PSV U19 | Willem II U21 | Free |
| 2015-05-01 | Frenkie de Jong | Willem II U21 | Willem II | — |
| 2015-02-01 | Frenkie de Jong | Willem II U19 | Willem II U21 | — |
| 2012-08-22 | Kelle Roos | Willem II U21 | NEC Nijmegen | — |
| 2012-07-01 | Wout Weghorst | Willem II U21 | FC Emmen | Free |
| 2011-09-01 | Ryan Sanusi | Willem II U21 | Willem II | — |