Union Berlin U19 (U19 Bundesliga): every transfer in and out, fees paid and earned, squad market value, €20k spent.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Linus Güther | Union Berlin U19 | 1.FC Union Berlin | Free |
| 2025-07-25 | Ion Ciobanu | Union Berlin U19 | Nürnberg II | Free |
| 2025-07-05 | Player | Union Berlin U19 | Rot-Weiß Erfurt | Free |
| 2025-07-01 | Player | Union Berlin U19 | 1.FC Union Berlin | Free |
| 2025-02-03 | Levis Asanji | Union Berlin U19 | AC Milan | Free |
| 2024-12-23 | Player | Union Berlin U19 | 1.FC Union Berlin | Free |
| 2024-08-30 | Barış Kalaycı | Union Berlin U19 | Fatih Karagümrük | Free |
| 2024-07-22 | Player | Union Berlin U19 | Augsburg II | Free |
| 2024-07-10 | Player | Union Berlin U19 | St. Pauli II | Free |
| 2024-07-01 | Player | Union Berlin U17 | Union Berlin U19 | Free |
| 2024-07-01 | Player | Union Berlin U17 | Union Berlin U19 | Free |
| 2024-07-01 | Player | Union Berlin U17 | Union Berlin U19 | Free |
| 2024-07-01 | Player | Union Berlin U19 | Viktoria Berlin U19 | Free |
| 2024-07-01 | Noah Engelbreth | Union Berlin U19 | Hannover 96 | Free |
| 2024-07-01 | Player | Union Berlin U19 | Hamburger SV U19 | Free |
| 2024-07-01 | Player | Union Berlin U19 | Hamburger SV II | Free |
| 2024-07-01 | Player | Union Berlin U19 | Luckenwalde | Free |
| 2024-07-01 | Player | Union Berlin U19 | Ingolstadt II | Free |
| 2024-01-01 | Player | Union Berlin U17 | Union Berlin U19 | Free |
| 2023-07-01 | Oluwaseun Ogbemudia | St. Pauli U17 | Union Berlin U19 | Free |