1.FC Köln II: every transfer in and out, fees paid and earned, squad market value, €400k spent and €1.3m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-01-01 | Youssoupha Niang | 1.FC Köln II | 1.FC Köln | — |
| 2025-07-04 | Emin Kujovic | 1.FC Köln II | 1.FC Köln | — |
| 2025-07-01 | Youssoupha Niang | 1.FC Köln U19 | 1.FC Köln II | — |
| 2025-01-01 | Patrik Kristal | Paide | 1.FC Köln II | Free |
| 2024-07-24 | Antonio Verinac | 1.FC Köln II | ETSV Hamburg | Free |
| 2024-01-01 | Justin Diehl | 1.FC Köln II | 1.FC Köln | — |
| 2023-07-01 | Justin Diehl | 1.FC Köln U19 | 1.FC Köln II | — |
| 2023-07-01 | Jens Castrop | 1.FC Köln II | 1.FC Nuremberg | €900k |
| 2023-07-01 | Emin Kujovic | 1.FC Köln U19 | 1.FC Köln II | — |
| 2023-07-01 | Antonio Verinac | SSV Jeddeloh II | 1.FC Köln II | Free |
| 2023-01-31 | Gabriel Segal | 1.FC Köln II | New York City | Free |
| 2022-07-15 | Gabriel Segal | Stanford Card. | 1.FC Köln II | Free |
| 2022-07-01 | Florian Dietz | 1.FC Köln II | 1.FC Köln | — |
| 2022-06-30 | Jae-hwan Hwang | 1.FC Köln II | Ulsan Hyundai | Free |
| 2022-05-31 | Noel Futkeu | 1.FC Köln II | Without Club | — |
| 2022-02-04 | Mathias Olesen | 1.FC Köln II | 1.FC Köln | — |
| 2022-01-07 | Jens Castrop | 1.FC Köln II | 1.FC Nuremberg | Loan |
| 2022-01-01 | Matthias Köbbing | 1.FC Köln II | 1.FC Köln | — |
| 2021-07-01 | Jens Castrop | 1.FC Köln U19 | 1.FC Köln II | — |
| 2021-07-01 | Florian Dietz | Unterhaching | 1.FC Köln II | Free |