Telstar U21: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-07-01 | Yamano Olfers | Telstar U21 | Telstar | — |
| 2025-07-01 | Abdelraffie Benzzine | Telstar U21 | Telstar | — |
| 2024-07-01 | Abdelraffie Benzzine | Telstar U18 | Telstar U21 | — |
| 2024-01-15 | Vincenzo Di Leva | Telstar U21 | Udinese U19 | — |
| 2023-07-01 | Vincenzo Di Leva | Telstar U18 | Telstar U21 | — |
| 2023-07-01 | Tim van de Loo | Telstar U21 | Telstar | — |
| 2023-07-01 | Caner Demircioglu | Telstar U21 | Volendam U21 | Free |
| 2023-01-01 | Yamano Olfers | Telstar U18 | Telstar U21 | — |
| 2021-07-01 | Tim van de Loo | Alphense B. U18 | Telstar U21 | Free |
| 2021-07-01 | Caner Demircioglu | De Volewijckers | Telstar U21 | Free |
| 2021-02-03 | Malik Dijksteel | Telstar U21 | Boro U23 | Free |
| 2020-07-01 | Malik Dijksteel | Without Club | Telstar U21 | — |