Heerenveen U21: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-08-01 | Ties Oostra | Heerenveen U21 | FC Emmen | Free |
| 2025-07-10 | Xavi Woudstra | Heerenveen U21 | Almere City U23 | Free |
| 2025-07-09 | Nolhan Courtens | Young Reds | Heerenveen U21 | Free |
| 2025-07-01 | Kai Jansen | Heerenveen U19 | Heerenveen U21 | — |
| 2024-07-01 | Robin Bouw | Heerenveen U18 | Heerenveen U21 | — |
| 2024-07-01 | Roan van der Plaat | Heerenveen U21 | Vitesse U21 | Free |
| 2024-07-01 | Melle Witteveen | Heerenveen U21 | Heerenveen | — |
| 2024-07-01 | Malcolm Mateyo | Heerenveen U21 | Almere City U23 | Free |
| 2024-07-01 | Jermaine Rijssel | Volendam U21 | Heerenveen U21 | Free |
| 2024-07-01 | Espen van Ee | Heerenveen U21 | Heerenveen | — |
| 2024-07-01 | Dimitris Rallis | Heerenveen U21 | Heerenveen | — |
| 2024-01-08 | Safouane Karim | Heerenveen U21 | FC Volendam | Free |
| 2023-07-18 | Espen van Ee | Vitesse U21 | Heerenveen U21 | Free |
| 2023-07-01 | Xavi Woudstra | Heerenveen U18 | Heerenveen U21 | — |
| 2023-07-01 | Oliver Braude | Heerenveen U21 | Heerenveen | — |
| 2023-07-01 | Malcolm Mateyo | Heerenveen U18 | Heerenveen U21 | — |
| 2023-07-01 | Isaiah Ahmed | Heerenveen U18 | Heerenveen U21 | — |
| 2023-07-01 | Dimitris Rallis | Heerenveen U18 | Heerenveen U21 | — |
| 2023-07-01 | Bernt Klaverboer | Heerenveen U21 | Heerenveen | — |
| 2023-01-01 | Oliver Braude | Heerenveen U18 | Heerenveen U21 | — |