Groningen U21 (): every transfer in and out, fees paid and earned, and the market value of the squad. €100k spent, — earned. Record complete to 2024-12-23.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2024-12-23 | David van der Werff | Groningen U21 | FC Groningen | — |
| 2024-09-26 | Maxim Mariani | Groningen U21 | FC Groningen | — |
| 2024-07-01 | Mark Hoekstra | Groningen U18 | Groningen U21 | — |
| 2024-07-01 | Roy Leicester | Groningen U18 | Groningen U21 | — |
| 2024-07-01 | Jay Kuiper | Groningen U21 | Almere City U23 | Free |
| 2023-11-01 | Wouter Prins | Groningen U21 | FC Groningen | — |
| 2023-07-01 | Jay Kuiper | Groningen U18 | Groningen U21 | — |
| 2023-07-01 | Robin Kelder | Groningen U18 | Groningen U21 | — |
| 2023-07-01 | Dirk Baron | Groningen U21 | FC Groningen | — |
| 2023-07-01 | Fofin Turay | Groningen U21 | FC Groningen | — |
| 2023-07-01 | Jasper Meijster | Groningen U21 | FC Groningen | — |
| 2023-07-01 | Tika de Jonge | Groningen U21 | FC Groningen | — |
| 2023-01-01 | Jorg Schreuders | Groningen U21 | FC Groningen | — |
| 2023-01-01 | Thijmen Blokzijl | Groningen U21 | FC Groningen | — |
| 2023-01-01 | Thom van Bergen | Groningen U21 | FC Groningen | — |
| 2022-07-01 | David van der Werff | Groningen U18 | Groningen U21 | — |
| 2022-07-01 | Fofin Turay | Groningen U18 | Groningen U21 | — |
| 2022-07-01 | Jasper Meijster | Groningen U18 | Groningen U21 | — |
| 2022-07-01 | Jorg Schreuders | Groningen U18 | Groningen U21 | — |
| 2022-07-01 | Thijmen Blokzijl | Groningen U18 | Groningen U21 | — |