ADO Den Haag U21 (U21 Divisie 1): every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-08-12 | Maikey Houwaart | ADO Den Haag U21 | Excelsior Maassluis | Loan |
| 2025-07-01 | Player | ADO Den Haag U21 | SDC Putten | Free |
| 2025-07-01 | Ronny Boakye | ADO Den Haag U21 | Quick Boys | Free |
| 2025-07-01 | Issac Dijkhuizen | ADO Den Haag U21 | TBC | Free |
| 2025-07-01 | Calvin Gustina | ADO Den Haag U21 | TBC | Free |
| 2025-07-01 | Jaynilson Geoffrey | ADO Den Haag U21 | TBC | Free |
| 2025-02-01 | Player | TBC | ADO Den Haag U21 | Free |
| 2025-01-15 | Player | ADO Den Haag U21 | Isparta Davrazspor | Free |
| 2025-01-01 | Lorenzo Maasland | ADO Den Haag U21 | ADO Den Haag | Free |
| 2024-09-03 | Player | ADO Den Haag U21 | Lisse | Free |
| 2024-09-03 | Player | ADO Den Haag U21 | Lisse | Free |
| 2024-08-26 | Player | ADO Den Haag U21 | FC Utrecht | Free |
| 2024-07-03 | Robyn Esajas | ADO Den Haag U21 | Fortuna Sittard | Free |
| 2024-07-01 | Elijah Guevarra Lloyd Velland | ADO Den Haag U21 | TBC | Free |
| 2024-07-01 | Jaynilson Geoffrey | TBC | ADO Den Haag U21 | Free |
| 2024-04-03 | Finn de Bruin | ADO Den Haag U21 | ADO Den Haag | Free |
| 2024-02-06 | Player | ADO Den Haag U21 | Karaman Belediyespor | Free |
| 2024-01-01 | Calvin Gustina | ADO Den Haag | ADO Den Haag U21 | Free |
| 2023-11-01 | Player | TBC | ADO Den Haag U21 | Free |
| 2023-07-03 | Onur Hüseyin Demir | ADO Den Haag U21 | Alanyaspor | Free |