1.FC Union Berlin (Bundesliga): every transfer in and out, fees paid and earned, squad market value, €128m spent and €96m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Marvin Friedrich | Mönchengladbach | Union Berlin | Free |
| 2026-07-01 | Diogo Leite | Union Berlin | Without Club | — |
| 2026-07-01 | Danilho Doekhi | Union Berlin | Without Club | — |
| 2026-07-01 | Alex Král | Union Berlin | Without Club | — |
| 2026-01-30 | Marin Ljubicic | Union Berlin | F. Düsseldorf | Loan |
| 2026-01-03 | Oluwaseun Ogbemudia | Union Berlin | W. Mannheim | Loan |
| 2025-09-01 | Lucas Tousart | Union Berlin | Stade Brestois | — |
| 2025-08-31 | Alexander Schwolow | Union Berlin | Heart of Midl. | Free |
| 2025-08-19 | Derrick Köhn | Galatasaray | Union Berlin | €4m |
| 2025-08-16 | László Bénes | Union Berlin | Kayserispor | Loan |
| 2025-08-13 | Dmytro Bogdanov | Dynamo Dresden | Union Berlin | €600k |
| 2025-07-24 | Stanley Nsoki | Hoffenheim | Union Berlin | Loan |
| 2025-07-15 | Paul Jaeckel | Union Berlin | Pr. Münster | €300k |
| 2025-07-11 | Matheo Raab | Hamburg | Union Berlin | €400k |
| 2025-07-07 | Kevin Vogt | Union Berlin | VfL Bochum | Free |
| 2025-07-01 | Woo-yeong Jeong | Stuttgart | Union Berlin | €4m |
| 2025-07-01 | Robin Gosens | Union Berlin | Fiorentina | €7m |
| 2025-07-01 | Oluwaseun Ogbemudia | U. Berlin U19 | Union Berlin | — |
| 2025-07-01 | Oliver Burke | Werder Bremen | Union Berlin | Free |
| 2025-07-01 | Kevin Volland | Union Berlin | 1860 Munich | Free |