Sittard U21: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-07-01 | Sofiane Et-Taïbi | Sittard U21 | Westerlo U21 | Free |
| 2025-07-01 | Niels Martens | Sittard U21 | Fortuna Sittard | — |
| 2025-07-01 | Hasip Korkmazyürek | Sittard U21 | Fortuna Sittard | — |
| 2024-07-01 | Tristan Schenkhuizen | Sittard U21 | Fortuna Sittard | — |
| 2024-07-01 | Sjors-Lowis Hermsen | Fortuna S. U18 | Sittard U21 | — |
| 2024-07-01 | Ramazan Bayram | Sittard U21 | Fortuna Sittard | — |
| 2024-07-01 | Owen Johnson | VV UNA U23 | Sittard U21 | Free |
| 2024-07-01 | Niels Martens | MVV Maastricht | Sittard U21 | Free |
| 2023-08-25 | Hasip Korkmazyürek | Istanbul U19 | Sittard U21 | Free |
| 2023-07-20 | Namory Cisse | Sittard U21 | A. Lustenau | — |
| 2023-07-01 | Sofiane Et-Taïbi | Jong Genk | Sittard U21 | Free |
| 2023-07-01 | Boaz Broekmans | Fortuna S. U18 | Sittard U21 | — |
| 2022-08-11 | Namory Cisse | 1.FC Köln U19 | Sittard U21 | Free |
| 2022-07-01 | Tunahan Taşçı | Sittard U21 | Fortuna Sittard | — |
| 2022-07-01 | Tristan Schenkhuizen | Fortuna S. U18 | Sittard U21 | — |
| 2022-07-01 | Ramazan Bayram | Fortuna S. U18 | Sittard U21 | — |
| 2022-07-01 | Daan Bisschops | Fortuna S. U18 | Sittard U21 | — |
| 2021-09-08 | Tunahan Taşçı | Without Club | Sittard U21 | — |
| 2021-07-01 | Tom Hendriks | Sittard U21 | Fortuna Sittard | — |
| 2020-07-01 | Tom Hendriks | Fortuna U19 | Sittard U21 | — |